前苏联专利SU1362409A3 Television device for selecting high-frequency signals in band of television broadcasting and cable

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专利摘要:
A multiband tuning system produces an IF signal from RF signals residing in, in the order named, a first broadcast band, a first cable band, a second broadcast band and a second cable band. A control device generates a tuning signal having a magnitude determined by the frequency of a selected channel. A first filter selects RF signals corresponding to channels selected in a first tuning band including the first broadcast band and a lower frequency portion of the first cable band in response to the tuning signal. A second filter selects RF signals corresponding to channels selected in a second tuning band including an upper frequency portion of the first cable band, the second broadcast and the second cable bands in response to the tuning signal. A selection device enables operation of the first filter when the selected channel is within the first tuning band and enables operation of the second filter when the selected channel is in the second tuning band.
公开号:SU1362409A3
申请号:SU823476200
申请日:1982-08-18
公开日:1987-12-23
发明作者:Эрл Териалт Джеральд
申请人:Рка Корпорейшн (Фирма)；
IPC主号:

专利说明:

with
The invention relates to television, specifically to television receiver tuning systems for selecting one of several frequency band channels.
The purpose of the invention is to reduce the distortion and intertwining of adjacent channels.
Fig. 1 shows a structural electrical circuit of a television device for selecting high frequency signals in a television broadcasting band and cable bandwidth; in fig. 2 is a circuit diagram of the first and second high-frequency filters.
The television device contains a control unit 1, a signal generator 2, the first to fourth switches 3-6, the first 7 and second 8 high-frequency filters, a signal amplifier 9, a diplexer 10, a frequency converter 11. The first high-frequency filter contains the first inductor 12, the first varactor 13, the first 14 and second 15 capacitors, the second in the tractor 16, the second .17 and the third 18 inductors, the first resistor 19, the fourth inductor 20, the second resistor 21, fifth coil 22 inductance.
The second high-pass filter 8 contains the sixth inductor 23, the LC circuit 24, the seventh inductor 25, the third varactor 26, the third capacitor 27, the fourth varactor 28, the fourth capacitor 29, the eighth 30 and ninth 31 inductors, the third 32 and the fourth 33 resistors.
The television device operates as follows.
The received high frequency television signal is converted to an intermediate frequency signal. The control unit 1 generates the first and second tuning signals, having a value determined by the frequency of the selected channel, which are fed to the first 7 and second 8 high-frequency filters, respectively. In this case, the first high-frequency filter 7 selects frequencies including the first television broadcast frequency band and the lower part of the cable band frequency, and the second high-frequency filter 8 selects a frequency band including the second frequency band 0
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broadcast and the upper part of the first and second cable frequency bands. ,
Signals from the third 4 and first 3 switches are supplied to the corresponding inputs of the first 7 and second 8 filters, and signals from the first 5 and second 8 high-frequency filters are respectively fed to the fourth 5 and second 6 switches. In this case, the corresponding control signals from control unit 1 are supplied to the switches 3-6. The signal from the combined outputs of the second 6 and fourth 5 switches through the signal amplifier 9 is fed to the first. the output of the diplexer 10, to the second input of which an intermediate frequency signal is applied. In a diplexer, signals are filtered accordingly. From the output of the diplexer 10, the signal is fed to a frequency converter 11, the second input of which is supplied with a signal from the generator 2 of the signal controlled from the control unit. At the output of the frequency converter 11, a signal with a low distortion is generated.
The operation of the first high-pass filter 7 is that the information signal passes through the first inductance 12, the first varactor 13, the first capacitor 14, the second capacitor 15, the second 5 reactor 16 and the second inductance 17, which are successively connected. Changing the settings is made by changing the respective capacities of the first 13 and second 16 variators by applying a control signal to them. The capacitance of the first varactor 13 resonates with the first 12 and fourth 20 inductors, and the capacitance of the second varactor 16 resonates with the second 17 and fifth 22 inductors, with the first high-frequency filter 7 having the high-frequency transmission characteristic.
0
five
0 The operation of the second high-pass filter 8 is that the information signal passes through the sixth inductance coil 23, the LC circuit 24 and the seventh inductance coil 25 in series. The frequency of the information signal is also tuned by applying a control signal to the third varactor 26 and the third capacitor 27 and four
The second varactor 28 and the fourth capacitor 29, and the eighth 30 and ninth 31 inductors serve as the locking inductance.

权利要求:
Claims (1)
[1]
Invention Formula
A television device for selecting high-frequency signals in a television broadcasting band and cable bandwidth, comprising a control unit, a signal generator, four switches, two high-frequency filters, a controlled signal amplifier, a diplexer and a frequency converter, the first, second, third and fourth quarters connected in series the outputs of the control unit are connected to the corresponding inputs of the signal generator; the fourth output of the control unit is connected to the corresponding inputs of the generator. a, the first and second outputs of the control unit are connected respectively to the first inputs of the first and second switches and to the first inputs of the third and fourth switches, and the fourth output of the control unit is connected to the control, inputs of the first and second high-pass filters (HPF), respectively the inputs of the first, third, and fourth switches are combined and are signal inputs, and the second inputs of the second and fourth switches are combined and connected to the input of a controllable signal amplifier, with output The first switch and the third switch output are connected to the signal inputs of the second high pass filter and the first high pass filter, the outputs of which are connected to the signal inputs of the second and fourth switches, respectively, while the second input of the frequency converter is connected to the generator output and the control input of the control unit, the first and the second outputs of which are combined and connected to the regulating input of the controlled signal amplifier, which is so that, in order to reduce distortion and interchange, no neighboring x channels, a first high frequency filter is adapted to change the amplitude of signals of television broadcast signals and the cable bandwidth, wherein
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five
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The first HPF contains serially connected first inductor, the first varactor, the first capacitor, the second capacitor, the second varactor and the second inductor, with the input of the first inductor and the output of the second inductance, respectively, the input and output of the first HPF, the third inductance, the first resistor, the fourth inductor, the second resistor, and the fifth inductor, the first output of the third inductor combined with the first terminals of the first inductor carcass inductance and the first varactor, and the first terminal of the first resistor is combined with the first terminals of the first varactor and the first capacitor, the first terminal of the fourth inductor is combined with the first terminals of the first and second capacitors, the first terminal of the second resistor is combined with the first terminals of the second capacitor and the second varactor, and The first pin of the fifth coil inductance is combined with the first pins of the second varactor and the second coil inductance, the second pins of the third, fourth and fifth coils of the inductive They are connected to a common bus, and the second terminals of the first and second resistors are the control input of the first high pass filter, and the second high pass filter contains the sixth inductance, the LC circuit and the seventh inductance, the third varactor and the third capacitor, and the fourth are sequentially connected in series. a varactor and a fourth capacitor, an eighth inductance coil, a ninth inductance coil, a third resistor connected in series and a fourth resistor, the first input being the eighth the inductance tabs and the anode of the third varactor are combined with the sixth inductance coil and the LC circuit, and the first output of the ninth inductor and the anode of the fourth varactor are combined with the LC circuit and the seventh inductance, the conclusions of the eighth and ninth inductors are connected to the second coil - g to the waters of the third capacitor and the fourth capacitor, respectively, and to the common bus; the second terminals of the third and fourth capacitors are combined with the corresponding conclusions of the third varactor, the third capacitor, the fourth varactor and the fourth capacitor, and the second terminals shestoy- inductor and a seventh inductor are soot Vets Enikeev signal input and output of the second LPF, and the combined corresponding terminals of the first and second resistors are controlled th input of the second conductive HPF.
FIG. one
Editor I.Gorn
Compiled by V. Lapshov Tehred M. Didyk
Order 6305/58 Circulation 636 Subscription
VNIIPI USSR State Committee
for inventions and discoveries 1130355 Moscow, Zh-35, Raushsk nab. 4/5
Production and printing company, Uzhgorod, st. Project, 4
Proofreader L. Pilipenko

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DK371282A|1983-02-20|

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NL8203245A|1983-03-16|

DE3230738A1|1983-03-03|

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US4408348A|1983-10-04|

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FR2511821B1|1986-11-21|

BE894135A|1982-12-16|

GB2105539B|1985-01-23|

SE8204674L|1983-02-20|

KR840001418A|1984-04-30|

AU8712182A|1983-02-24|

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法律状态:

优先权:

申请号 | 申请日 | 专利标题

US06/294,133|US4408348A|1981-08-19|1981-08-19|Multiband tuning system for a television receiver|

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