• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    1. A device for automatically tuning a band-pass filter, containing a series-connected band-pass filter, the input of which is the input of the device, the first frequency discriminator, the output of which is the output of the device, the first quanta. t4l and the first analog-to-digital converter and serially connect. The second frequency discriminator, whose input is combined with the input of the bandpass filter, the second quantizer, the second analog-to-digital converter and the control unit, the first and second outputs of which are connected to the first and second control inputs of the bandpass filter, respectively, are characterized in that signal-to-noise ratio; a subtractor and an adder are connected in series between the output of the first analog-digital converter and the second control input of the control unit; audio signal slope and a memory unit arranged in series between the output of the second analog-to-digital converter and a second input of the adder and a delay block connected between the output of the second analog-to-digital converter and a second input of the subtractor. 2. An automatic tuning device for a bandpass filter containing I serially connected strips (Loo filter, the input of which is the device input, the frequency discriminator, the output of which is the output of the device, the quantizer and: the analog-to-digital converter, as well as the control unit, the first and the second outputs of which are connected to the first and second control inputs of the bandpass filter, respectively, differing in that, in order to increase the signal-to-noise ratio, a signal slope determination unit is inserted into it a memory unit and a first delay unit connected in series between the output of the analog-digital converter and the first control input of the control unit, and a second delay unit connected between the output of the analog-digital converter and the second control input of the control unit was inserted. -A device for automatic adjustment of a band-pass filter containing series-connected
    公开号:SU1192643A3
    申请号:SU813338150
    申请日:1981-09-15
    公开日:1985-11-15
    发明作者:Фавро Мишель；Маргэн Андре
    申请人:Томсон-Цсф (Фирма)；
    IPC主号:
    专利说明:

    The first band-pass filter, whose input and output are respectively the input and output of the device, the first amplitude detector and the first comparator, and the control unit, the first and second outputs of which are connected to the first and second control inputs of the first band-pass filter, respectively, characterized in that In order to increase the signal-to-noise ratio, a frequency discriminator, a quantizer, an analog-to-digital converter, a signal slope determination unit, and a memory unit connected in series between th device and the first control input of the control unit, which second control input is connected to yuschy
    2643
    an analog-digital converter output, a second band-pass filter and a second amplitude detector connected in series between the device input and a second input of the first comparator, and a third band filter, a third amplitude detector and a second comparator connected in series between the device input and the second address input of the memory unit, the third address input of the memory unit is connected to the code of the first comparator, the second input of the second comparator is connected to the output of the first amplitude detector, the first and second pack Aulus yuschievhody second and a third band-pass filters are connected to first and second outputs of the control unit respectively.
    I
    The invention relates to television technology, in particular to the processing of television signals.
    The aim of the invention is to increase the signal-to-noise ratio.
    FIG. Figure 1 shows the structural electrical circuit of the automatic adjustment of the band-pass filter in the first embodiment; in fig. 2 - the same, according to the second option; in fig. 3 - the same, according to the third, option.
    The automatic tuning device of the bandpass filter in the first embodiment (Fig. 1) contains the first delay line 1, the band-pass filter 2, the first frequency discriminator 3, the first quantizer 4, the first analogue .... a go-digital converter 5, a second frequency discriminator 6, a second quantizer 7, a second analog-digital converter 8, a control unit 9, a subtractor 10, an adder 11, a second delay line 12, a signal slope unit 13 and a memory unit 14.
    The device for automatically adjusting the bandpass filter according to the second variant (Fig. 2) contains a bandpass filter 15, a frequency discriminator 16, a quantizer 17, an analog-to-digital converter 18, a control unit 19, a signal slope determining unit 20, a memory unit 21, the first 22 and second 23 blocks of delay. /
    The device for automatically adjusting the bandpass filter in the third embodiment (Fig. 3) contains a delay line 24, a first band filter 25, a first 26 and a second 27 frequency discriminators, a quantizer 28, an analog-to-digital converter 29, a block 30 for determining the slope of the signal 31, control unit 32, second 33 and third 34 bandpass filters, first 35, second 36 and third 37 amplitude detectors, first 38 and second 39 comparators.
    The device in the first embodiment works as follows.
    The input signal arrives at the input of the first delay line 1 and is delayed therein by the time required to obtain the control signal of the setting of the bandpass filter 2. The input signal also arrives at the input of the second frequency discriminator 6, the output of which removes the modulated signal that is quantized by the second quantizer 7 and is converted into a sequence of digital samples corresponding. 3 values of the instantaneous frequency Fj of the modulated signal, the second analog-digital converter 8. The input of block 13 is connected to the output of the second analog-digital converter 8 and provides at its output the values of the slope of the modulated signal. The steepness values are determined by the least squares method based on five samples. For each value of the slope, the memory unit 14 generates a corresponding value, which is approximate, in connection with which the Sb error correction circuit is provided. The error correction circuit and bj consist of the first frequency discriminator 3, the first quantizer 4, which samples the modulated signal. These samples are digitized using a first analog-to-digital converter 5, after which the error FB in subtractor 1 is determined. Second delay line 12 has the delay time needed to prepare the samples for error detection. At the output of the subtractor 10, an adder 11 is turned on, which performs summation of the samples Hc + Hbc b, the output of the adder 11 is connected to one of the inputs of the control block 9, which provides the signals for F n to control the setting of the band pass filter 2. from the outputs of control unit 9 to ensure synchronism between samples independent of the phase change caused by changes in the characteristic of the band-pass filter 2. The device according to the second embodiment operates as follows. . Directly to the input of the band-pass filter 15 receives a modulated signal. This signal after frequency discriminator 16 is quantized and digitized. At the output of the analog-digital converter 18, digital samples are generated corresponding to the instantaneous frequency of the modulated signal. Blocks 20 and 21 provide 4343 bp. The control unit 19 receives signals F cc that have passed through the second 23 and first 22 delay blocks, respectively, which have a delay equal to the duration of one television line. Block 19 controls the setting of the band-pass filter 15. The device according to the third embodiment operates as follows. The sampling correction bc is carried out not by adding an amendment to the sampling value, but by changing the address supplied to memory 31. The error is estimated as follows. The first bandpass filter 25 with a passband b, the second bandpass filter 33 with a 0.75 bandwidth (and the third bandpass filter 34 with a 1.4Hz bandwidth receive signals controlling their central frequency and passband. In addition, the input modulated signal delayed by a delay line arrives 24. The output of the first bandpass Ailtra 25 through the first amplitude detector 35 is connected to the first inputs of the first and second comparators 38 and 39. The output of the second bandpass filter 33 through the second amplitude detector 36 Connected to the second input of the first comparator 38, and the output of the third band-pass filter 34 through the third amplitude detector 37 to the second input of the second comparator 39. The first comparator 38 produces a signal equal to a logical unit, if at its inputs the signals have the same value that goes to the first address input of memory 31. The second comparator 39 generates a signal equal to a logical one, if at its second input the signal exceeds the signal at the first input, which is fed to the second address input of memory 31. Not the third address input of the memory block 31 receives the value of the rate of change of the modulated signal calculated by block 30. The signals from the outputs of the analog-to-digital converter 29 and the memory block 31 are fed to the corresponding inputs of the control unit 32 and adjust the band-pass filters 25.33 and 34.
    权利要求:
    Claims (3)
    [1]
    DEVICE FOR AUTOMATIC SETTING OF A BAND FILTER (ITS OPTIONS).
    (57) 1. A device for automatically tuning a band-pass filter, comprising a series-connected band-pass filter, the input of which is the input of the device, a first frequency discriminator, the output of which is the output of the device, a first quantizer and a first analog-to-digital converter and a second frequency discriminator connected in series, the input of which is combined with the input of the bandpass Filter, a second quantizer, a second analog-to-digital converter and a control unit, the first and second outputs of which are connected s to the first and second control inputs of the bandpass filter, respectively, characterized in that, in order to increase the signal-to-noise ratio, a subtractor and an adder are inserted into it, sequentially connected between the output of the first analog-to-digital converter and the second control input of the control unit, the determination unit the steepness of the signal and the memory block sequentially connected between the output of the second analog-to-digital converter and the second input of the adder, and the delay block connected between the output of the second analog-to-digital and the forming the second input of the subtractor.
    [2]
    2. A device for automatic tuning of a band-pass filter containing a series-connected band-pass filter, the input of which is the input of the device, a frequency discriminator, the output of which is the output of the device, a quantizer and an analog-to-digital converter, as well as a control unit, the first and second outputs of which are connected to the first and the second control inputs of the band-pass filter, respectively, characterized in that, in order to increase the signal-to-noise ratio, a block for determining the steepness of the signal, a memory block, is introduced into it and first delay unit in series between the output of analog-to-digital converter and a first control input of the control unit, and entered a second delay unit connected between the output of analog-to-digital converter and a second control input of the control unit.
    [3]
    3. A device for automatic tuning of a band-pass filter, comprising a series-connected first band-pass filter, the input and output of which are the input and output of the device, the first amplitude detector and the first comparator, as well as the control unit, the first and second outputs of which are connected to the first and second control inputs the first band-pass filter, respectively, characterized in that, in order to increase the signal-to-noise ratio, a frequency discriminator, a quantizer, an analog-to-digital conversion are introduced into it The slider, the slope determination unit, and the memory unit, connected in series between the input of the device and the first control input of the control unit, the second control input of which is connected to the output of the analog-to-digital converter, the second band-pass filter and the second amplitude detector, connected in series between the device input and the second input the first comparator, and the third bandpass filter, the third amplitude detector and the second comparator, connected in series between the input of the device and the second address input a memory unit, the address input of the third memory unit connected to the output of the first comparator, the second input of the second comparator connected to the output of the first amplitude detector, the first and second upravlyayuschievhody second and third bandpass filters are connected to first and second outputs of the control unit accordingly.
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1192643A3|1985-11-15|Automatic control device for band-pass filter |
    US4506228A|1985-03-19|Digital FM detector
    US4736392A|1988-04-05|Demodulator for digital FM signals
    FI73854C|1987-11-09|Demodulation circuit for a digitized chrominance signal
    US4285006A|1981-08-18|Ghost cancellation circuit system
    JPS5564477A|1980-05-15|Television receiver
    KR950035440A|1995-12-30|Digital Residual Sideband Detector with Bandpass Phase Tracker Using Radar Filter for High Quality Television Receivers
    RU97106814A|1999-05-27|METHOD AND DEVICE FOR EXTENSION OF DYNAMIC RANGE OF RECEIVER
    US5592557A|1997-01-07|Radio receiver with digital signal processing
    SU1125774A2|1984-11-23|Automatic servo corrector of arbitrary distortions of phase-frequency response characteristics of television communication channel
    SU488305A1|1975-10-15|Frequency modulated demodulator
    RU1800657C|1993-03-07|Device for separating chrominance and brightness signals in secam decoder
    SU828424A1|1981-05-07|Device for processing broad-band frequency-modulated signals
    SU1589402A1|1990-08-30|Device for suppression of narrow-band interference
    SU790358A1|1980-12-23|Discrete for receiving frequency-modulated signals with large base
    SU884078A1|1981-11-23|Device for discriminating control voltage of automatic amplification control of phase-difference manipulation signal receiver
    SU1450130A2|1989-01-07|Receiver of frequency/phase-manipulated signals
    SU1146826A1|1985-03-23|Receiver of multilevel phase-shift keyed signal
    SU1075432A2|1984-02-23|Device for tracking lag
    SU1185627A1|1985-10-15|Device for synchronizing multifrequency signal receiver
    CA1285032C|1991-06-18|I-q channel adaptive line enhancer
    SU794711A1|1981-01-07|Frequency demodulator
    SU660281A1|1979-04-30|Arrangement for checking multichannel communication line with frequency multiplexing
    SU1501253A1|1989-08-15|Digital frequency detector
    SU371556A1|1973-02-22|ALL-UNION TITLE 1 ^ t '^ y iv ^ g
    同族专利:
    公开号 | 公开日
    MX151086A|1984-09-27|
    AU7528681A|1982-03-25|
    FR2490427A1|1982-03-19|
    AU545262B2|1985-07-04|
    FR2490427B1|1986-04-18|
    AR230540A1|1984-04-30|
    JPS5783907A|1982-05-26|
    CA1198485A|1985-12-24|
    JPS645761B2|1989-01-31|
    EP0048661B1|1985-02-20|
    EP0048661A1|1982-03-31|
    AT11988T|1985-03-15|
    US4458207A|1984-07-03|
    DE3169060D1|1985-03-28|
    BR8105905A|1982-06-08|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1729361A|1928-05-12|1929-09-24|Royer Foundry & Machine Co|Apparatus for preparing molder's sand|
    US3218641A|1962-10-01|1965-11-16|Sanders Associates Inc|Fm radar system with automatic bandwidth control|
    FR1431746A|1965-01-21|1966-03-18|Thomson Houston Comp Francaise|Improvements to active electric filters|
    US3629716A|1969-03-24|1971-12-21|Infinite Q Corp|Method and apparatus of infinite q detection|
    US3978416A|1975-04-30|1976-08-31|Rca Corporation|Filter which tracks changing frequency of input signal|
    US4045740A|1975-10-28|1977-08-30|The United States Of America As Represented By The Secretary Of The Army|Method for optimizing the bandwidth of a radio receiver|
    DD139378A1|1976-07-26|1979-12-27|Wolfgang Heiss|CIRCUIT ARRANGEMENT FOR NOISE REDUCTION, IN PARTICULAR IN THE REPRODUCTION OF RECORDED VIDEO SIGNALS, WITH A FREQUENCY-RELATED FILTER ARRANGEMENT|
    US4101837A|1977-05-11|1978-07-18|Scientific-Atlanta, Inc.|Threshold extension fm demodulator apparatus for wide band width fm signals|
    JPS5843301Y2|1977-07-02|1983-09-30|
    US4339828A|1979-10-12|1982-07-13|Chasek Norman E|Automatic method for advantageously trading signal distortion for improved noise threshold in frequency modulated receivers|CA1190289A|1981-04-28|1985-07-09|Nippon Hoso Kyokai|Fm signal demodulation system|
    US4594556A|1983-07-22|1986-06-10|Sharp Kabushiki Kaisha|Demodulation circuit from FM signals and demodulation system therefor|
    US4584599A|1984-12-19|1986-04-22|Scientific Atlanta, Inc.|Signal to noise ratio enhancement using baseband signals in an FM television system|
    US4792993A|1985-10-30|1988-12-20|CapetronicLtd.|TVRD receiver system with automatic bandwidth adjustment|
    US4698598A|1986-08-04|1987-10-06|Scientific Atlanta, Inc.|FM demodulator system with threshold extension|
    DE3724604A1|1987-04-15|1988-12-01|H U C Elektronik Gmbh|ARRANGEMENT FOR FILTERING AN FM VHF RECEPTION SIGNAL|
    DE3818749A1|1988-05-30|1989-12-21|H U C Elektronik Gmbh|FM RECEIVER|
    DE3818753A1|1988-05-30|1989-12-21|H U C Elektronik Gmbh|FM RECEIVER|
    DE3818748A1|1988-05-30|1989-12-21|H U C Elektronik Gmbh|FM RECEIVER|
    DE3818750A1|1988-05-30|1989-12-14|H U C Elektronik Gmbh|FM RECEIVER|
    DE3818751A1|1988-05-30|1989-12-07|H U C Elektronik Gmbh|FM RECEIVER|
    DE3818752A1|1988-05-30|1989-12-07|H U C Elektronik Gmbh|FM RECEIVER|
    JPH0335612A|1989-06-30|1991-02-15|Clarion Co Ltd|Fm demodulation circuit|
    FI84540C|1990-02-08|1991-12-10|Telenokia Oy|FOERFARANDE OCH ANORDNING FOER IDENTIFIERING AV EN OEVERVAKNINGSSIGNAL PAO BASSTATIONEN I ETT RADIOTELEFONSYSTEM.|
    FR2659508A1|1990-03-09|1991-09-13|Portenseigne Radiotechnique|THRESHOLD LOWERING FREQUENCY DEMODULATOR.|
    JP2595783B2|1990-07-31|1997-04-02|日本電気株式会社|Transmitter|
    WO1995010889A1|1993-10-14|1995-04-20|Ericsson Ge Mobile Communications Inc.|Adaptive bandwidth receiver|
    US5668837A|1993-10-14|1997-09-16|Ericsson Inc.|Dual-mode radio receiver for receiving narrowband and wideband signals|
    US5937341A|1996-09-13|1999-08-10|University Of Washington|Simplified high frequency tuner and tuning method|
    US6167246A|1997-05-09|2000-12-26|Micrel Incorporated|Fully integrated all-CMOS AM receiver|
    GB2335808B|1998-03-24|2001-09-12|Ericsson Telefon Ab L M|Demodulator circuits|
    FI107090B|1999-04-19|2001-05-31|Nokia Mobile Phones Ltd|Method and arrangement for tuning a resonator|
    US7272375B2|2004-06-30|2007-09-18|Silicon Laboratories Inc.|Integrated low-IF terrestrial audio broadcast receiver and associated method|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    FR8019921A|FR2490427B1|1980-09-16|1980-09-16|DEMODULATOR OF A FREQUENCY MODULATED SIGNAL AND TELEVISION SYSTEM COMPRISING SUCH A DEMODULATOR|
    [返回顶部]