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    • 专利摘要:
    Method of diffusion of electronic data by means of optical radiation, the said method comprising: - A step of creating a data signal (s (t)) by introducing and / or modulating electronic data on it; - A step of injection or wired transmission of the said data signal (s (t)) on an electrical network (400) of at least part of a building comprising at least a pair of electrically insulated cables (F, N) for electric power supply , in which the said step of injection or wired transmission takes place on a first point of the said electric network; - A step of diffusion of said data signal (s (t)) on said electric network (400) of said at least part of building; - A step of receiving the said data signal in a second point (401) of the said electrical network of the said at least part of the said building, the said second point being separated with respect to the said first point; - A modulation step of an optical radiation (108) generated by at least a first optical transmitter module by means of said data signal (s (t)), wherein in said modulation said data signal (s (t)) acts as a signal modulating, in which the said first optical transmitter module is installed at the said second point with a wired connection on the said electrical network (400).
    公开号:CH714131A2
    申请号:CH01123/17
    申请日:2017-09-08
    公开日:2019-03-15
    发明作者:Pasquali Alessandro
    申请人:Slux Sagl；
    IPC主号:
    专利说明:

    Description
    FIELD OF THE FOUND
    [0001] The present invention relates to the field of optical radiation transmission and in detail concerns a data transmission system by means of optical radiation by means of diffusion through conveyed waves. The present invention also relates to an associated data dissemination method.
    STATE OF ART
    [0002] It is known to use the electromagnetic spectrum in the field of radio frequencies for the transmission of electronic data, such as images or audio. The transmission of electronic data on radio channels requires the assignment of a specific channel for each transmission that cannot be shared except with multiplexing techniques.
    [0003] The widespread use of wireless transmissions for the diffusion of electronic data in broadcast mode, in simulcast mode or with transmissions selectively dedicated towards a portion of the user, especially observed the increase in the volumes of electronic data to be exchanged that one has developed in recent years, it has quickly saturated the previously available radio channels, forcing the technological community to search for new radio resources, and that is frequency bands, at an ever higher frequency, until reaching the microwave spectrum, to allow the transmission of electronic data over the radio channel using broadband. The typical example is represented by radio transmission backbones for mobile telephony signals, DAB radios, high definition television signals, which use frequency bands in the microwave region to have a plurality of adjacent channels, each of which has sufficient bandwidth for the type of transmission required.
    [0004] The massive use of wireless radio transmission for the transmission of electronic data has given rise to several problems. A first problem is given by the fact that often radio transmissions exploit overlapping radio channels or in any case interfered by transmission spectra of adjacent channels, or by other sources of interference geographically allocated in a different position from those of interest.
    [0005] The use of radio transmissions at very high frequencies is moreover subject to considerable atmospheric absorption, the latter being in fact substantially increasing with increasing frequency for the radiofrequency spectrum; consequently, to transmit electronic data on broad band at very high frequencies it is typically necessary to use significantly high transmission powers.
    [0006] Nevertheless, the use of particularly high radio frequencies, especially for proximal transmissions and for consumer applications, is currently the subject of debate about the harmfulness to health.
    [0007] Currently, to transmit data on a wireless channel, radio transmissions are typically used which allow the signal on which said data is transmitted to pass through the physical barriers of an apartment - floor walls - without the need to lay wiring. The most typical example of these types of transmissions is given by WiFi networks, where electronic data is transmitted by a modem or access point to other wireless modems installed on board the various electronic devices that are used daily by the user.
    [0008] It is also known the use of the so-called "power lines", that is those technological applications for the transmission of electronic data that exploit the electric power supply and the electrical energy distribution cables already arranged in buildings as transmission means. In «power lines», the electronic data is transmitted by superimposing an electrical signal at a frequency significantly higher than the frequency - typically 50 Hz or 60 Hz depending on the countries - of the alternating network voltage. The separation of the electrical signal that transports the data of interest with respect to the mains voltage is achieved by filtering and separating the frequencies used.
    [0009] The applicant noted that for the dissemination of electronic data, the use of "powerline" does not fully solve the problem of the dissemination of electronic data within the home or more generally in a building. In fact, the «powerline» technology allows the transmission of data for the note on a transmission medium realized by the electric energy transport cables, and in practice therefore up to the wall sockets that are typically deployed in the building. However, if a user wants to receive data wirelessly because he is not connected or near a wall, he still needs a wireless connection, which today is typically made via radio. Otherwise, the user must connect a device with «powerline» technology to the wall socket, which is supplied via the mains voltage and typically has a data transmission output which in most cases is either by radio or wired, preferably on RJ45 standard LAN connection.
    [0010] In the transmission of data inside a building without the use of radio signals in a free environment and without the use of wired connections - especially outside the walls - both traditional WiFi networks and power lines are ineffective.
    [0011] The object of the present invention is to describe a system and a method of electronic data diffusion by means of diffused optical radiation through the transmission of conveyed waves, which contribute to solving the disadvantages described above.
    SUMMARY OF THE INVENTION
    [0012] A first object of the present invention is a method of spreading electronic data by means of optical radiation, the said method comprising: - A step of creating a data signal by introducing and / or modulating electronic data on it ; - A step of injection or wired transmission of the said data signal on an electrical network of at least part of a building comprising at least a pair of electrically insulated electric power cables, in which the said step of injection or wired transmission takes place on a first point of said electric network; - A step of diffusion of said data signal on said electric network of said at least part of building; - A step of receiving the said data signal in a second point of the said electrical network of the said at least part of the said building, the said second point being separated with respect to the said first point; - A modulation step of an optical radiation generated by at least a first optical transmitter module by means of said data signal, in which in said modulation said data signal acts as a modulating signal, in which said first optical transmitter module is installed in correspondence with said second point with a wired connection on said electrical network.
    [0013] According to a further non-limiting aspect, the said wired connection on the said electrical network of the said at least one first optical transmitter module is a connection in which the said optical transmitter module is physically connected to the said electrically connected pair of power supply cables isolated.
    [0014] According to a further non-limiting aspect, the said method comprises a step for receiving the said optical radiation by at least one first optical receiver module comprising at least one demodulator stage, or the optical demodulator module, in which it demodulates the said optical radiation to extract at least one replica of said data signal.
    [0015] According to a further non-limiting aspect, there is a step for filtering the said electrical signal from the network voltage, in which the said filtering step operates a frequency selection centered on a predetermined frequency band, separated from the band of frequencies in which said network voltage lies.
    [0016] According to a further non-limiting aspect, the said modulation step is an amplitude modulation step.
    [0017] Alternatively, according to a further non-limiting aspect, the said modulation step is a frequency modulation step.
    [0018] Still alternatively, according to a further non-limiting aspect, the said modulation step is a pulse width modulation step.
    [0019] Still alternatively, according to a further non-limiting aspect, the said modulation step is a modulation step comprising a first amplitude modulation step of the said data signal (s (t)) by means of an AM modulator (102), in where an intermediate signal (s2 (t)) is generated upon the said amplitude modulation step, of which the said data signal (s (t)) is a modulating signal; - a second frequency modulation step of said intermediate signal (s2 (t)) by means of an FM modulator (103), in which a driving signal (v7 (t), 7) is generated as a result of said frequency modulation step (t)) in voltage or in current; - a step for adjusting the intensity of light radiation (lr (t)) of said optical radiation (108) emitted by at least one photoemitter (100) by means of said driving signal (v7 (t), I7 (t)) .
    [0020] According to a further non-limiting aspect, the said modulation step of an optical radiation generated by at least a first optical transmitter module by means of the said data signal, wherein in the said modulation the said data signal acts as a modulating signal, in which the said first optical transmitter module installed at said second point with a wired connection on said electrical network is performed by an optical transmitter module integrated in a body of a lighting device.
    [0021] According to a further non-limiting aspect, or ninth aspect depending on the aforesaid eighth aspect, in said step of adjusting the intensity of light radiation, the intensity of radiation lr (t) made variable according to said driving signal comprises a first continuous part (I), independent of the said driving signal and a second part variable in time, direct function of the said driving signal (v7 (t), i7 (t)).
    [0022] According to a further non-limiting or tenth aspect, which can be combined with the aforementioned eighth aspect, the said variable part in the direct function of the said driving signal (v7 (t), Ì7 (t)) is lower for absolute value to the absolute value assumed by the said first continuous part (I).
    [0023] According to a further non-limiting aspect, or eleventh aspect, which can be combined with one or more of the preceding eighth, ninth or tenth aspects, the said method comprises a step of generating a first reference frequency (fO) for the said modulation of amplitude.
    [0024] According to a further non-limiting aspect, or twelfth aspect, which can be combined with one or more of the preceding eighth, ninth or tenth aspects, the said method comprises a step of generating a first reference frequency (fO) for the said modulation of amplitude and a second reference frequency (fc) for said frequency modulation.
    [0025] According to a further non-limiting aspect, or thirteenth aspect, which can be combined with one or more of the previous eleventh or twelfth aspect, the step of generating said first reference frequency and / or said first and said second reference frequency is performed by means of the power supply of an AM modulator (102) and / or an AM modulator (102) and an FM modulator (103) with a reference frequency generator (109).
    [0026] According to a further and fourteenth aspect, a further object of the present invention is represented by an optical transmitter device, comprising: - At least one photoemitter (100) adapted to transmit in use an optical radiation (108) modulated - At least one pair of inputs (99d) for supplying at least said at least one photoemitter (100) - A filtering stage (217) having its own input electrically connected to said at least one pair of inputs (99d), said filtering stage being configured to separate , by means of a frequency selection, an electrical data signal (s (t)) from a network voltage (v (t)) in use present on said pair of inputs (99d) simultaneously with said data signal (s (t)) and to produce on its output the said data signal (s (t)) isolated from the said network voltage (v (t)) - A modulator stage (101), operatively connected with the output of the said filtering stage (217), compr having at least one operative configuration in which it generates an electrical driving signal (v7 (t), i7 (t)) for said at least one photoemitter (100) modulated according to a predefined modulation scheme based on said data signal (s )).
    [0027] According to a further non-limiting aspect, or fifteenth aspect, depending on the aforementioned fourteenth aspect, the said at least one photo-emitter (100), the said filtering stage (217), the said modulator stage (101) are enclosed in a single body.
    [0028] According to a further non-limiting or fifteenth aspect, depending on the aforementioned fourteenth or fifteenth aspect, the said device further comprises an electric decoupling stage (216) interposed between the said pair of inputs (99d) and the said modulator stage (101 ) and having inputs directly connected to said pair of inputs (99d).
    [0029] According to a further non-limiting aspect, or sixteenth aspect, depending on one or more of the preceding aspects thirteenth-fifteenth, said modulator stage (101) is an amplitude modulator stage.
    [0030] Alternatively, according to a further non-limiting aspect, or seventeenth aspect, depending on one or more of the preceding aspects thirteenth-fifteenth, the said modulator stage (101) is a frequency modulator stage.
    [0031] Still alternatively, according to a further non-limiting aspect, or eighteenth aspect, depending on one or more of the preceding aspects thirteenth-fifteenth, the said modulator stage (101) is a pulse width modulator stage.
    [0032] Still alternatively, according to a further non-limiting or nineteenth aspect, depending on one or more of the preceding aspects thirteenth-fifteenth, the said modulator stage (101) is a hybrid stage comprising: - an inlet (105) adapted to receiving in use an electrical signal (s (t)) to be modular, and - an output (107) transmitting to at least one photoemitter (100) a driving signal (v7 (t), i7 (t)) in voltage or in current for which the said electrical signal (s (t)) represents a modulating signal, where the said at least one photoemitter (100) transmits an optical radiation (108) with radiation intensity lr (t) variable according to the said driving signal (v7 (t), i7 (t)), and in which, between said input and said output of said modulator stage (107) there is a cascade of a first modulator AM (102) and of a second modulator FM (103) , said FM modulator (103) being located downstream of said modulator AM (102) and having a prop the output is directly connected to the output (107) of the said modulator stage (101), in which the said modulator AM (102) has an input directly connected to the said input (105) of the said modulator stage and is directly supplied by the said electric signal (s (t)) to be modulated and in which the said modulator AM (102) has an output on which it generates an intermediate signal (s2 (t)) fed to the input of the said FM modulator (103).
    [0033] According to a further non-limiting aspect, or twentieth aspect, depending on the previous nineteenth aspect, there is also a driving stage (104) which loses at least one photoemitter (100) interposed between the said output (107) of the said modulator stage ( 101) and the said at least one photo-emitter (100), in which the said driving stage (104) is configured to condition the said driving signal (v7 (t), i7 (t)) and comprises processing means comprising at least one operating configuration such that the said intensity of radiation lr (t) variable according to the said driving signal comprises a first continuous part I, independent of the said driving signal and a second part variable in time, direct function of the said driving signal, in which the said time variable portion of the said driving signal is lower by absolute value than the absolute value assumed by the said first continuous part.
    [0034] According to a further non-limiting aspect, or twenty-first aspect, depending on the previous nineteenth or twentieth aspect, said intermediate signal (s2 (t)) supplied at the input of said FM modulator (103) is a signal able to cause a variation of the instantaneous frequency assumed by the said driving signal (v7 (t)), i7 (t)) at the output of the said FM modulator (103).
    [0035] According to a further non-limiting aspect, or twenty-second aspect, depending on the previous twentieth or twenty-first aspect, the said device comprises at least one reference frequency generating stage (109), wherein the said reference frequency generating stage (109) is electrically connected to a frequency reference input of said modulator AM (102) and generates at least a first reference frequency (fO) for said modulator AM.
    [0036] As an alternative to the aforementioned twenty-second aspect, according to a further non-limiting aspect, or twenty-third aspect, the said reference frequency generating stage (109) is electrically connected to a frequency reference input of the said AM modulator (102) by means of a first output thereof (109f) and is also electrically connected to a frequency reference input of said FM modulator (103) by means of a second output thereof (109s).
    [0037] According to a further non-limiting aspect, or twenty-fourth aspect, depending on the twenty-second or twenty-third aspect, the said reference frequency generating stage (109) generates at least a first reference frequency (fO) for the said AM modulator (102 ) and a second reference frequency (fc) for the said FM modulator (103).
    [0038] According to a further non-limiting aspect, or twenty-fifth aspect, depending on one or more of the preceding aspects thirteenth-twenty-fourth, the said device further comprises at least one photoreceiver (200) electrically connected with a demodulator stage (201), called the demodulator stage (201) in use receiving an electric driving signal (v7 (t), I7 (t)) generated by said at least one photoreceiver (200) and comprising at least one operative configuration in which it generates on its output a replica signal of output (s' (t)) said output replication signal representing a data signal used to modulate an optical radiation received by said photoreceiver (200).
    [0039] According to a further non-limiting aspect, or twenty-sixth aspect, depending on the preceding twenty-fifth aspect, the said demodulator stage (201) is an amplitude demodulator stage.
    [0040] Alternatively, according to a further non-limiting aspect, or twenty-seventh aspect, depending on the preceding twenty-fifth aspect, the said demodulator stage (201) is a frequency demodulator stage.
    [0041] Alternatively, according to a further non-limiting aspect, or twenty-eighth aspect, depending on the preceding twenty-fifth aspect, the said demodulator stage is a pulse-width demodulator stage.
    [0042] Alternatively, according to a further non-limiting aspect, or twenty-ninth aspect, depending on the preceding twenty-fifth aspect, the said demodulator stage is a hybrid demodulator stage comprising: - an input (205) adapted to receive in use a driving signal (v7 (t), Ì7 (t)) in voltage or modulated current and generated through a photoreceiver (200) connected to it and receiving in use an optical radiation (108) also reflected, and - an output (207) transmitting a replica signal output (s' (t)) for which the said electric signal (s (t)) represents a modulating signal, and in which, between said input and said output of the said demodulator stage (201) there is a cascade of a first demodulator FM (203) and a second demodulator AM (202), said demodulator FM (203) being located upstream of said demodulator AM (202), in which said demodulator AM (202) has an input directly connected to the output of said demodulator FM (203).
    [0043] According to a further non-limiting aspect, or thirtieth aspect, depending on one or more of the preceding twenty-fifth to twenty-ninth aspects, the said demodulator stage comprises an output electrically connected to a secondary circuit of the said decoupler (216).
    [0044] According to a further non-limiting or thirty-first aspect, depending on the previous thirtieth aspect, the said decoupler (216) is a voltage-lowering transformer in which the average voltage on the secondary circuit is lower than the average voltage present on the primary circuit .
    [0045] According to a further non-limiting or thirty-second aspect, it is also object of the invention to provide a data diffusion system via optical radiation, comprising, - an injection device for an electric data signal (s (t)) comprising at least a pair of connectors adapted to be electrically connected on an electrical network (400) and - at least one optical transmitter device according to one or more of the preceding aspects thirteenth - thirty-first.
    [0046] In particular, according to a further non-limiting aspect, or thirty-third aspect, the said injection device is an optical transmitter device according to the twenty-fifth aspect or one or more of the aspects dependent on it. [0047] For greater clarity, the following definitions apply in the present description.
    [0048] For the purposes of the present invention, optical radiation is defined as an optical radiation comprised in the infrared spectrum and / or in the ultraviolet spectrum and / or in the visible spectrum.
    [0049] For the purposes of the present invention, direct optical radiation or direct optical transmission means a transmission of optical radiation in which optically opaque obstacles and reflections are not interposed between a source or photoemitter and a destination or photoreceiver. In other words, in the direct optical radiation or direct optical transmission, the transmission of the signals takes place with the said source or photoemitter and the destination or photoreceiver in an optical range, ie mutually visible.
    [0050] For the purpose of greater understanding of the present invention, the following definitions are applied: - "Transparency" means a characteristic such that the material under examination can pass radiation incident along a preferential direction, independently of the attenuation that this radiation undergoes in passing through the said material. - "Infrared" or "Infrared" means electromagnetic radiation which has a wavelength of approximately between 0.7 pm and 15 pm. - "visible" or "visible spectrum" means electromagnetic radiation which has a wavelength of approximately 390 to 700nm. - "Ultraviolet" or "ultraviolet" means electromagnetic radiation which has a wavelength approximately between 400nm and 10nm. - By "directive irradiation" or even only "directive" when referring to an optical and / or radiofrequency radiation, we mean a radiation emitted by a radiator in the domain of interest - therefore optical or radiofrequency - in which a sector of the sphere of an otherwise isotropic radiator has a greater radiated electromagnetic power density than the remaining sectors.
    BRIEF DESCRIPTION OF THE DRAWINGS
    [0051] Some embodiments and some aspects of the invention will be described hereinafter with reference to the accompanying drawings, provided for indicative and therefore non-limiting purposes, in which:
    Fig. 1 shows a basic diagram of a device according to the invention, operating according to the method described above, in an embodiment thereof preferably but not limitedly in the form of a light bulb; fig. 2 illustrates a first alternative and non-limiting solution for the modulator present in the device according to the invention; fig. 3 shows a second alternative and non-limiting solution for the modulator present in the device according to the invention; fig. 4 illustrates a third alternative and non-limiting solution for the modulator 101 present in the device according to the invention; fig. 5 shows a fourth alternative and non-limiting solution for the modulator present in the device according to the invention; fig. 6 shows a more detailed diagram for the fourth alternative and non-limiting solution for the modulator present in the device according to the invention; and fig. 7 illustrates an alternative and non-limiting embodiment of the device according to the invention in which there is a modulator and also a demodulator for optical radiation; and fig. 8 shows an electrical diagram for the embodiment of fig. 7.
    DETAILED DESCRIPTION OF THE INVENTION
    [0052] The object of the present invention is an optical transmitter device, represented in a non-limiting embodiment thereof in fig. 1. This device is provided with at least one photoemitter 100 adapted to transmit in use a modulated optical radiation 108. The optical transmitter device, which in a preferred and non-limiting embodiment takes the form of a light bulb 99 equipped with a body 99 and a portion 99c adapted to emit an optical radiation, has at least one pair of inputs 99d for powering the photoemitter 100 by means of an electric energy coming from the electric network of a building. On the domestic electricity network a data signal s (t) travels superimposed to a network voltage v (t). Preferably, the inputs 99d are connected on a socket 401 which is in turn connected to an electrical network, preferably but not limited to the domestic electrical network 400 of an apartment. On this electric network, the network voltage v (t) can be a continuous or alternating network voltage, characterized in this case by its own carrier frequency.
    [0053] In detail, the photoemitter 100 can be either a coherent photoemitter - meaning "coherent" a monochromatic photoemitter such as a LASER or incoherent - meaning "incoherent" a photoemitter which emits a polychromatic optical beam, intended for example of white light or any other color not characterized by high spectral purity, such as a LED diode. Conveniently, in the form of a light bulb, the device object of the invention can comprise a plurality of high-power photo-emitters 100 which advantageously allow illuminating, for example, a room.
    [0054] Preferably, but not limited to, the optical transmitter device has a filtering stage 217 having its own input electrically connected to the inputs 99d. The filtering stage is configured to separate, by means of a frequency selection, the data signal s (t) of electrical type from the mains voltage v (t) in use present on the inputs 99d simultaneously with said data signal s (t) and to produce on said output the said data signal s (t) isolated from the network voltage v (t).
    [0055] Conveniently, the frequency band on which the data signal s (t) is transmitted on the domestic electricity network 400 is a frequency band separate from the frequency band on which the electrical signal of the network voltage v (t is transmitted). ); conveniently, the selection of a suitable guard interval between the two bands can be provided, which advantageously allows an optimization of the filtering.
    [0056] The optical transmitter device which in the embodiment of fig. 1 is identified by a light bulb or equivalent lighting device, it comprises at least one optical transmitter module 99 which comprises the photoemitter 100 and at least one modulator stage 101.
    [0057] The modulator stage 101 is operatively connected to the output of the filtering stage 217, comprising at least one operative configuration in which it generates an electrical driving signal v7 (t), Ì7 (t) the photoemitter 100 modulated according to a scheme of predefined modulation on the basis of said data signal s (t).
    [0058] As illustrated in the embodiment of fig. 1, the photo-emitter 100, the said filtering stage 217 and the said modulator stage 101 are enclosed in a single body thanks to which they can be easily handled.
    [0059] To guarantee the correct decoupling of the data signal s (t) from the network voltage v (t), which is considerably higher than the data signal itself, the device object of the invention further comprises a decoupling stage 216 interposed between the inputs 99d and the modulator stage 101 having inputs directly connected to said pair of inputs 99d.
    [0060] In accordance with a first embodiment, illustrated in fig. 2, the modulator 101 is an amplitude modulator stage. Alternatively, the modulator 101 can be an FM frequency modulator stage (Fig. 3) or a pulse-width modulator stage (Fig. 4).
    [0061] Still alternatively, as shown in fig. 5, the modulator stage 101 is a hybrid stage comprising: - an input 105 adapted to receive in use an electrical signal s (t) to be modular, and - a transmitting output 107 towards the photoemitter 100 a driving signal v7 (t), 7 (t) in voltage or current for which the electrical signal s (t) represents a modulating signal, [0062] In accordance with the received driving signal, the photoemitter 100 transmits an optical radiation 108 with radiation intensity lr (t ) variable according to said driving signal v7 (t), I7 (t), and said said input and said output of said modulator stage 107 there is a cascade of a first modulator AM 102 and a second modulator FM 103. The modulator FM 103 being located downstream of the modulator AM 102 and has its own output directly connected to the output 107 of the modulator stage 101.
    [0063] Advantageously, the Applicant has observed that the cascade use of an AM modulation followed by an FM modulation for an optical signal allows an optimal diffusion of the same in the environment and a considerable ease of reception of optical radiations which - in the whole radiation spectrum typical of the optical signals as previously defined - can be conveniently received and demodulated not by direct transmission but also by reflected transmission by one or more reflections or diffusions by one or more surfaces.
    [0064] The modulator AM 102 has an input directly connected to the input 105 of the modulator stage and is directly supplied by the said electrical signal s (t) to be modulated. The modulator AM 102 has an output on which it generates an intermediate signal s2 (t) fed to the input of the said FM modulator 103.
    [0065] Preferably, but not limited to, there is also a driving stage 104 interposed between the output 107 of the modulator stage 101 and the photoemitter 100. Advantageously, the driving stage 104 is configured to condition the said driving signal v7 ( t), 7 (t) and comprises processing means operating in such a way that, in at least one operating configuration, the intensity of radiation lr (t) variable according to the driving signal comprises a first continuous part I, independent from the aforesaid driving signal and a second part which varies in time, a direct function of the driving signal itself. Preferably but not limitedly, the time-dependent direct part of said driving signal is lower by absolute value than the absolute value assumed by said first continuous part.
    [0066] In particular, the intermediate signal s2 (t) supplied at the input of the modulator FM 103 is a signal able to cause a variation of the instantaneous frequency which the driving signal v7 (t), λ7 (t) at the output of the FM 103 modulator.
    [0067] In order to generate a frequency useful for the FM modulation, the modulator 101 also comprises a reference frequency generation stage 109, electrically connected to a frequency reference input of the modulator AM 102 and generates at least a first reference frequency. fO for the AM modulator. Alternatively, as shown in fig. 6, the reference frequency generating stage 109 is electrically connected to a frequency reference input of said modulator AM 102 by means of a first output 109f thereof and is also electrically connected to a frequency reference input of said modulator FM 103 by means of a second exit of his 109s.
    [0068] Where it is desired to divide the carrier frequencies of the component AM from the FM component, the reference frequency generation stage 109 generates at least a first reference frequency fO for the said AM modulator 102 and a second reference frequency fc for the said FM 103 modulator.
    [0069] At least some of the modulator stage can be made hardware or with a mixed hardware software structure or again as SDR, therefore purely software without this difference constituting a limitation for the purposes of the present invention.
    [0070] As shown in fig. 7, the device object of the invention can further comprise a demodulator 200 electrically connected to an optical receiver module 199. Preferably but not limitedly, also the optical receiver module 199 is integrated in the same body in which the modulator and the inputs 99d are integrated.
    [0071] The optical receiver module 199 is configured to demodulate the optical signal received from the photo receiver 200 and to transmit on its output an electric replication signal s' (t).
    [0072] In a preferred and non-limiting embodiment, the optical receiver module 199 can integrate an AM demodulator. Alternatively, in a further non-limiting embodiment, the optical receiver module 199 can integrate an FM or PWM demodulator.
    [0073] In particular, the photoreceiver 200 is electrically connected with a demodulator stage 201, and in use receives an electric driving signal v7 (t), Ì7 (t) generated by the photoreceiver 200. In a specific operating configuration, the demodulator 201 generates on its output an output replication signal s' (t) which represents a data signal used to modulate an optical radiation received by the photoreceiver 200.
    [0074] Still alternatively, the demodulator stage is a hybrid demodulator stage comprising: - an input 205 adapted to receive in use a driving signal v7 (t), Ì7 (t) in voltage or in modulated current and generated through a photoreceiver 200 connected to it and receiving in use an optical radiation 108 also reflected, and - a transmitting output 207 an output replication signal s' (t) for which the electrical signal (s (t)) represents a modulating signal, and in which , between the input and said output of the demodulator stage 201 there is a cascade of a first demodulator FM 203 and a second demodulator AM 202, In particular, as illustrated in fig. 8, the demodulator FM 203 is placed upstream of the demodulator AM 202, which in turn has an input directly connected to the output of the said demodulator FM 203.
    [0075] The Applicant has observed that the hybrid demodulator stage as described above has surprisingly been observed to be particularly suitable to receive with correct demodulation of the modulating signal, optical radiations 108 received indirectly, through multiple reflections or even diffusions, without between the radiation source and the photoreceiver 200 a direct optical path is present.
    [0076] The demodulator stage comprises an output electrically connected to a secondary circuit of the decoupler 216.
    [0077] The decoupler 216, preferably but not limited to, is a voltage-lowering transformer provided with a primary connected to the inputs 99d of the device object of the invention and with a secondary connected with the optical modulator stage 99 and, when present, with the optical demodulator stage 199.
    [0078] Where this decoupler 216 is a voltage-lowering stage, the average voltage on the secondary circuit is lower than the average voltage present on the primary circuit. Thanks to this feature it is possible to create a device that is particularly safe to use and handle.
    [0079] Advantageously, the connection of the decoupler 216 both to the optical transmitter module 99 and to the optical receiver module 199 advantageously allows the device object of the invention to become not only a means of spreading a modulated optical radiation, but also of becoming a device which allows the injection on the domestic electric network 400 of a received data signal starting from a further optical signal in turn.
    [0080] Where it is desired to transmit an electronic data by means of optical radiation using the device object of the invention, a first step of the method of diffusion of electronic data by optical radiation, which is also object of the invention, comprises first of all a step of creation of a data signal s (t) by the introduction and / or modulation on it of electronic data. Preferably, but not limited to, such electronic data is electronic data of an audio signal.
    [0081] The data signal s (t) is subsequently injected onto the domestic electricity network 400 by a procedure of a known type. In particular, the injection of the data signal s (t) on the domestic electricity network 400 can take place via a wired transmission. Following the injection of the electrical signal on the wired network, the method which is the subject of the invention comprises a diffusion of the data signal s (t) in the form of a preferably voltage signal, along the entire domestic electrical network 400, so that it spreads to one or more electrically connected electrical sockets 401 on the domestic electricity network.
    [0082] In particular, where the domestic electrical network is of the single-phase type, there are two electrical conductors, identified in fig. 1 with the references F, N, on which the data signal is transported. The data signal s (t) is therefore transported from a first point, which corresponds to the injection point, to at least a second point which corresponds to the electrical sockets 401.
    [0083] The method further comprises a step for receiving the data signal s (t) superimposed on the voltage or current signal, at the electrical outlet 401, and by means of a connection of a known type is transmitted to the inputs 99d of the device or bulb 99c object of the invention.
    [0084] Here the electrical signal is first subjected to a filtering step by means of the decoupling stage 216 preferably realized through the transformer previously described together with the filtering stage 217. The purpose of these two stages is to lower the voltage to which the modulator and demodulator cooperate and, moreover, separate the useful component of the data signal s (t) from the 50 / 60Hz component typical of the mains voltage of the domestic appliances. Where the mains voltage v (t) is not alternated, but on the contrary it is a direct voltage, this filtering stage 217 may not be present.
    [0085] Subsequently, the method provides a modulation step of an optical radiation 108 generated by at least a first optical transmitter module 99 by means of the data signal s (t) thus extracted from the voltage signal present on the domestic electrical network 400. In particular, the data signal acts as a modulating signal for the aforementioned optical radiation. The modulation of the optical signal follows in particular the predefined modulation scheme described above.
    [0086] In the method object of the present invention, the wired connection on said electric network of said at least one first optical transmitter module is a connection in which the optical transmitter module 99 is physically connected to said pair of electric power cables mutually electrically isolated .
    [0087] Where the device forming the subject of the present invention presents both the optical receiver stage and the optical transmitter stage 199, 99, the method forming the subject of the present invention also presents a reception step of an optical radiation 108 set aside. of at least a first optical receiver module 199 comprising at least one demodulator stage 201 in which it demodulates the said optical radiation to extract at least one replica of the said data signal s (t).
    [0088] The method object of the invention also comprises a step of filtering said electric signal from the network voltage v (t), wherein said filtering step operates a frequency selection centered on a predetermined frequency band, separated from the frequency band in which said network voltage v (t) lies. This filtering step is operatively carried out by the filtering stage 217.
    [0089] When present, the reception step of the said optical radiation 108 is operatively followed by a demodulation step according to a predefined demodulation scheme, which preferably but not limitedly follows the modulation scheme which is also used for the modulation of the data signal s (t). Through the demodulation step according to the predefined demodulation scheme, a replication data signal s' t (t) is generated which is transmitted is optionally but not limitedly injected into the domestic electricity network 400.
    [0090] The reception step of the optical radiation 108 by the device object of the invention when equipped with an optical demodulator stage as previously described, is therefore followed by an injection signal of the replica signal s (t) of the data signal s (t) with which the received optical radiation 108 has been modulated, within the domestic electrical network 400. In the injection step, the replication signal s' (t) is made to transit first within the secondary stage of the decoupler 216 from which it passes on the the primary stage of the decoupler itself, therefore being able to be injected and spread on the domestic electricity network.
    [0091] The applicant has furthermore found that in the injection step, through the passage from the secondary to the primary of the decoupler 216, it is possible to raise the voltage value of the replica signal s' (t) injected into the domestic electrical network. In doing so, the energy demand that is delegated for the «creation» of the replication signal s '(t) is moderate, and at the same time, following the phase of voltage increase which is brought about by the passage of the replica signal s' ( t) from the secondary to the primary of the decoupler, it is advantageously possible to optimize the immunity to noise of the system. In fact, the injection into the network of a voltage signal s (t) raised by the transition from the secondary to the primary of the decoupler, makes the signal / noise ratio greater than that which would have if the signal replicated s' (t) were not raised in voltage, allowing a diffusion of the replication signal s (t) correctly distinguishable with respect to electrical noise, on large domestic 400 electricity networks, as well as on public networks on which the system can be installed, even in the presence of strong electromagnetic disturbances.
    [0092] It is therefore also object of the invention a data diffusion system via optical radiation which comprises: - An optical transmitter device according to the invention, operatively connected to the domestic electrical network 400 at the aforementioned second point by means of its inputs 99d, and - An injection device for a data signal s (t), which on the basis of electronic data transmits the data signal s (t) to the domestic electrical network 400, and more properly injected.
    [0093] Conveniently, the data signal injection device s (t) can advantageously be a particular embodiment of the optical transmitter device according to the invention, if equipped with an optical receiver stage. In this case, conveniently, the inputs 99d, due to the presence of the connection between the output 207 of the demodulator with the decoupling stage 216, also become connection terminals with the domestic electric network 400, and allow
    权利要求:
    Claims (16)
    [1]
    claims
    1. Method of diffusion of electronic data by means of optical radiation, the said method comprising: - A step of creating a data signal (s (t)) by introducing and / or modulating electronic data on it; - A step of injection or wired transmission of the said data signal (s (t)) on an electrical network (400) of at least part of a building comprising at least a pair of electrically insulated cables (F, N) for electric power supply , in which the said step of injection or wired transmission takes place on a first point of the said electric network; - A step of diffusion of said data signal (s (t)) on said electric network (400) of said at least part of building; - A step of receiving the said data signal in a second point (401) of the said electrical network of the said at least part of the said building, the said second point being separated with respect to the said first point; - A modulation step of an optical radiation (108) generated by at least a first optical transmitter module (99) by means of said data signal (s (t)), wherein in said modulation said data signal (s (t)) acts as a modulating signal, in which the said first optical transmitter module (99) is installed at the said second point with a wired connection on the said electrical network (400).
    [2]
    2. Method according to claim 1, wherein the wired connection on said electric network (400) of said at least one first optical transmitter module (99) is a connection in which said optical transmitter module (99) is physically connected to said pair of electric power cables (F, N) which are electrically isolated from each other.
    [3]
    3. A method according to Claim 2, in which there is a step for receiving the said optical radiation by at least one first optical receiver module (199) comprising at least one demodulator stage (201) in which it demodulates the said optical radiation to extract at least one replica of the said data signal.
    [4]
    4. Method according to claim 3, in which there is a filtering step of said data signal (s (t)) from the network voltage (v (t)), wherein said filtering step operates a centered frequency selection on a predetermined frequency band, separated from the frequency band in which said network voltage (v (t)) lies.
    [5]
    5. Method according to any one of the preceding claims, in which the said modulation step is an amplitude modulation step and / or a frequency modulation step and / or a pulse width modulation step.
    [6]
    6. Method according to any one of the preceding claims 1-4, wherein said modulation step is a modulation step comprising a first step of modulation in amplitude of said data signal (s (t)) by means of an AM modulator (102) , in which following an said amplitude modulation step an intermediate signal (s2 (t)) is generated of which said data signal (s (t)) is a modulating signal; - a second frequency modulation step of said intermediate signal (s2 (t)) by means of an FM modulator (103), in which a driving signal (v7 (t), i7 is generated following said frequency modulation step) (t)) in voltage or in current; - a step for adjusting the intensity of light radiation (lr (t)) of said optical radiation (108) emitted by at least one photoemitter (100) by means of said driving signal (v7 (t), i7 (t)) .
    [7]
    7. Method according to any one of the preceding claims, in which the step of transmission of the optical radiation performed by means of said first optical transmitter module (99) is installed at said second point with a wired connection on said electric network (400) is performed by an optical transmitter module integrated in a body of a lighting device (99c).
    [8]
    8. Method according to claim 6, wherein in said step of adjusting the intensity of light radiation, the radiation intensity (lr (t)) made variable according to said driving signal comprises a first continuous part (I) , independent of the said driving signal and a second time-varying part which is a direct function of the said driving signal (v7 (t), i7 (t)).
    [9]
    9. Method according to Claim 8, in which the said variable part in the direct function of the said driving signal (v7 (t), i7 (t)) is lower by absolute value than the absolute value assumed by the said first continuous part (I ).
    [10]
    10. Optical transmitter device, comprising: - at least one photo-emitter (100) able to transmit in use a modulated optical radiation (108); - at least one pair of inputs (99d) for supplying at least said at least one photoemitter (100), - a filtering stage (217) having its own input electrically connected to said at least one pair of inputs (99d), said stage filtering being configured to separate, by means of a frequency selection, an electrical data signal (s (t)) from a mains voltage (v (t)) in use present on said pair of inputs (99d) simultaneously to said data signal (s (t)) and to produce on its output the said data signal (s (t)) isolated from said network voltage (v (t)); - a modulator stage (101), operatively connected with the output of the said filtering stage (217), comprising at least one operative configuration in which it generates an electric driving signal (v7 (t), i7 (t)) for said at least one photo-emitter (100) modulated according to a predefined modulation scheme based on said data signal (s (t)).
    [11]
    11. Device according to claim 11, wherein said at least one photo-emitter (100), said filtering stage (217), said modulator stage (101) are enclosed in a single body.
    [12]
    12. Device according to claim 10 or claim 11, further comprising a decoupling stage (216) interposed between said pair of inputs (99d) and said modulator stage (101) and having inputs directly connected to said pair of inputs (99d).
    [13]
    13. Device according to any one of claims 10-12, wherein said modulator stage (101) is an amplitude modulator stage and / or a frequency modulator stage and / or a pulse width modulator stage.
    [14]
    14. Device according to any one of Claims 10-12, in which the said modulator stage (101) is a hybrid stage comprising: - an input (105) adapted to receive in use an electrical signal (s (t)) to be modulated, and - an output (107) transmitting to at least one photoemitter (100) a driving signal (v7 (t), i7 (t)) in voltage or current for which the said electric signal (s (t)) represents a modulating signal, wherein the said at least one photoemitter (100) transmits an optical radiation (108) with radiation intensity lr (t) variable according to the said driving signal (v7 (t), i7 (t)), and in which , between said input and said output (107) of said modulator stage there is a cascade of a first modulator AM (102) and a second modulator FM (103), said FM modulator (103) being located downstream of said modulator AM (102) and having its own output directly connected to the output (107) of the said modulator stage (101), in which the said modulator AM (102) has an input directly connected to said input (105) of said modulator stage and is directly supplied by said electric signal (s (t)) to be modulated and in which said modulator AM (102) has an output on which it generates an intermediate signal (s2 (t)) fed to the input of the said FM modulator (103).
    [15]
    15. Device according to any one of the preceding claims 10-14, comprising at least one photoreceiver (200) electrically connected with a demodulator stage (201), said demodulator stage (201) in use receiving an electric driving signal (v7 (t), 7 (t)) generated by said at least one photoreceiver (200) and comprising at least one operative configuration in which it generates on its output an output replication signal (s' (t)) said output replication signal representing a data signal used to modulate an optical radiation received by the said photoreceiver (200).
    [16]
    16. Data diffusion system via optical radiation, comprising, - an injection device of an electric data signal (s (t)) comprising at least a pair of connectors adapted to be electrically connected on an electric network (400), optionally corresponding to the device according to claim 15, and - at least one optical transmitter device according to one or more of the preceding claims 10-15.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    优先权:
    申请号 | 申请日 | 专利标题
    CH01123/17A|CH714131B1|2017-09-08|2017-09-08|Data transmission system by optical radiation by diffusion by conveyed waves and associated method.|CH01123/17A| CH714131B1|2017-09-08|2017-09-08|Data transmission system by optical radiation by diffusion by conveyed waves and associated method.|
    PCT/IB2018/056872| WO2019049090A1|2017-09-08|2018-09-10|System for transmitting data by means of optical radiation by means of diffusion by power lines and associated method|
    EP18782794.4A| EP3729689A1|2017-09-08|2018-09-10|System for transmitting data by means of optical radiation by means of diffusion by power lines and associated method|
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