SU862372A1

SU862372A1 - Stereo signal transmission channel

Info

Publication number: SU862372A1
Application number: SU792850453A
Authority: SU
Inventors: Владимир Иванович Коваленко; Николай Макарович Балан; Анатолий Васильевич Выходец
Original assignee: Одесский Электротехнический Институт Связи Им.А.С.Попова
Priority date: 1979-12-12
Filing date: 1979-12-12
Publication date: 1981-09-07

Description

Изобретение относится к технике радиосвязи и может использоваться для построения совместных систем стереофонического радиовещания, работающих в режиме амплитудной модуляции на средних волнах, а также для стереофонического радиовещания в сетях многопрограммного проводного вещания.The invention relates to radio communication technology and can be used to build joint stereo broadcasting systems operating in the amplitude modulation mode at medium waves, as well as for stereo broadcasting in multiprogramming wire broadcasting networks.

Известна система передачи стереофонических сигналов, содержащая на передающей стороне датчики сигналов первого и второго каналов, выходы которых через перемножитель подключены к выходу блока нелинейного преобразования, а также генератор промежуточной частоты, выходы которого подключены через первый амплитудный модулятор к первому входу сумматора и через последовательно соединенные фазосдвигающий блок и второй амплитудный моду-jQ лятор к второму входу сумматора, а на приемной стороне— последовательно соединенные полосовой фильтр и усилитель-ограничитель, выход которого под2 ключей непосредственно к входу синхронного детектора первого канала, и через фазосдвигающий блок - к входу синхронного детектора второго канала, причем вход полосового фильтра и другие входы синхронных детекторов первого и второго каналов объединены f 1J.A known system for transmitting stereo signals containing, on the transmitting side, the signal sensors of the first and second channels, the outputs of which are connected via a multiplier to the output of the nonlinear conversion unit, as well as an intermediate frequency generator, the outputs of which are connected through the first amplitude modulator to the first input of the adder and through phase-shifting connected in series a block and a second amplitude modulator-jQ converter to the second input of the adder, and on the receiving side, a series-pass filter and a limiter amplifier, the output of which is under 2 keys directly to the input of the synchronous detector of the first channel, and through the phase-shifting unit, to the input of the synchronous detector of the second channel, the input of the bandpass filter and other inputs of synchronous detectors of the first and second channels are combined f 1J.

• Известная система обладает низкой помехоустойчивостью, т.к. включение режекторных фильтров приводит к подавлению узкой полосы частот в передаваемом сигнале, что снижает качество вещания. Кроме того, она не устраняет нелинейные искажения.• The known system has low noise immunity, because the inclusion of notch filters suppresses a narrow band of frequencies in the transmitted signal, which reduces the quality of broadcasting. In addition, it does not eliminate non-linear distortion.

Цель изобретения -повышение помехоустойчивости.The purpose of the invention is to increase noise immunity.

Поставленная цель достигается тем, что в системе передачи стереофонических сигналов на передающей стороне в каждый канал введены последовательно соединенные дополнительные сумматор и детектор, а также блок амплитудных модуляторов, первый, второй и третий входы которого соединены соответствен3 862372 но с выходами датчиков сигналов первого и второго каналов и выходы блока нелинейного преобразования, а объединенные четвертый, пятый входы и шестой вход - соответственно с входами первого и второго амплитудных модуляторов, другие входы которых соединены соответственно с выходами детекторов первого и второго каналов, а на приемной стороне введены амплитудный детектор, суммарно-разностный преобразователь и последовательно сб'ёдиненные квадратурный детектор первого канала и фазоинвертор, последовательно соединенные квадратурный детектор второго канала, сумматор и делитель . напряжения, выход которого подключен к входу суммарно-разностного преобразователя, другой вход которого соединен с другие входом делителя напряжения и выходом аплитудного детектора, вход которого соединен с другими входами синхронных детекторов первого и второго каналов, выходы которых подключены соответственно к входам квадратурных детекторов.This goal is achieved by the fact that in the stereo signal transmission system on the transmitting side, additional adder and detector are connected in series to each channel, as well as an amplitude modulator unit, the first, second and third inputs of which are connected respectively 3 862372 but with the outputs of the signal sensors of the first and second channels and outputs of the nonlinear conversion unit, and the combined fourth, fifth inputs and sixth input, respectively, with the inputs of the first and second amplitude modulators, other inputs of which x are respectively connected to the outputs of the first and second channel detector and an amplitude detector incorporated on the receiving side, a sum-difference converter and sequentially sb'odinennye quadrature detector of the first channel and a phase inverter, serially connected second channel quadrature detector, an adder and a divider. voltage, the output of which is connected to the input of the sum-difference converter, the other input of which is connected to the other input of the voltage divider and the output of the amplitude detector, the input of which is connected to other inputs of synchronous detectors of the first and second channels, the outputs of which are connected respectively to the inputs of the quadrature detectors.

На фиг. 1 дана структурная электрическая схема передающей сторонь! предложенной системы; на фиг. 2 - то же, приемной стороны.In FIG. 1 is a structural electrical diagram of the transmitting side! proposed system; in FIG. 2 - the same, receiving side.

Система передачи стереофонических сигналов содержит на передающей стороне датчики 1,2 первого и второго каналов, перемножитель 3, блок 4 нелинейного преобразования, генератор 5 промежуточной частоты, амплитудные модуляторы 6,7, сумматор 8, фазосдвигающий блок 9, сумматоры 10,11, детекторьГ 12,13,блок 14 амплитудных модуляторов , а на приемнбй стороне-полосовой · фильтр 15,усилитель-ограничитель 16, синхронные детекторы 17,18,фазосдвигающий блок 19,амплитудный детектор 20, суммарно-разностный преобразователь 21, квадратурные детекторы 22,23, фазоинвертор 24, сумматор 25, делитель 26 напряжения, причем блок 14 амплитудных модуляторов содержит амплитудные модуляторы 27-29.The stereo signal transmission system comprises transmitters 1.2 of the first and second channels, a multiplier 3, a nonlinear conversion unit 4, an intermediate frequency generator 5, amplitude modulators 6.7, an adder 8, a phase shifting unit 9, adders 10.11, a detector 12 , 13, block 14 amplitude modulators, and on the receiving side a band-pass filter 15, amplifier-limiter 16, synchronous detectors 17,18, phase-shifting unit 19, amplitude detector 20, sum-difference converter 21, quadrature detectors 22,23, phase-inverter 24, ummator 25, voltage divider 26, the unit 14 comprises the amplitude modulator amplitude modulators 27-29.

от генератора 5 промежуточной частоты. Сигналы от датчиков 1 и 2 первого и второго каналов в .'амплитудных модуляторах 28 и 29 модулируют по амплитуде частоту, поступающую от генератора промежуточной частоты 5. В каждом сумматоре 10 и 11 складываются два амплитудно-модулированных сигнала, находящихся в квадратуре. Квадратурно-модулированные колебания попадают в детекторы 12,13, а полученным (Сигналом в амплитудном модуляторе 6 модулируется промежуточная частоты с генератора 5. Аналогично _.from the generator 5 of the intermediate frequency. The signals from the sensors 1 and 2 of the first and second channels in the amplitude modulators 28 and 29 modulate in amplitude the frequency coming from the intermediate frequency generator 5. In each adder 10 and 11, two amplitude-modulated signals are added in quadrature. Quadrature-modulated oscillations get into the detectors 12,13, and received (signal in the amplitude modulator 6 modulates the intermediate frequency from the generator 5. Similarly _.

¹ в модуляторе 7 модулируется по амплитуде промежуточная частота, сдвинутая на 90^г фазосдвигающим блоком 9. ‘ налы с амплитудных модуляторов складываются в сумматоре 8. ¹ in the modulator 7, the intermediate frequency is shifted in amplitude, shifted 90 ^{g by the} phase-shifting unit 9. The channels from the amplitude modulators are added to the adder 8.

I В стереофоническом приемнике нал е усилителя промежуточной частоты поступает на синхронные детекторы 17 и 18, амплитудный детектор 20 и на полосовой фильтр I5, выделяющий проме25. жуточиую частоту, к выходу которого подключен усилитель-ограничитель 16, подключенный выходом к управляющему входу синхронного детектора 17 непосредственно, а к входу детектора 18 через фазосдвигающий (на 90°) блок 19. Выходы детекторов 17 и 18 подключены к квадратурным детекторам 22 и 23. К сумматору 25 сигналы от детектора 22 поступают непосредственно, а от детектора 23 - через фазоинвертор 24. На делитель напряжения 26 поступают сиг* налы от сумматора 25 и от амплитудного детектора 20. Сигнал от детектора 20 поступает на первый вход суммарно-разностного преобразователя 21, а на второй вход поступает сигнал с выхода делителя 26. С выходов суммарноразностного преобразователя 21 ются сигналы первого и второго лов.I In a stereo receiver, the amplifier of the intermediate frequency goes to synchronous detectors 17 and 18, an amplitude detector 20, and to a bandpass filter I5, which isolates the intermediate 25. a random frequency, to the output of which an amplifier-limiter 16 is connected, connected directly by the output to the control input of the synchronous detector 17, and to the input of the detector 18 through a phase-shifting (90 °) unit 19. The outputs of the detectors 17 and 18 are connected to quadrature detectors 22 and 23. The adder 25 receives signals from the detector 22 directly, and from the detector 23 through the phase inverter 24. The voltage divider 26 receives signals * from the adder 25 and the amplitude detector 20. The signal from the detector 20 is fed to the first input of the total-difference eobrazovatelya 21 and a second input receives a signal output from the divider 26. The outputs summarnoraznostnogo converter 21 are signals of the first and second trunks.

сиг6 и 7whitefish 6 and 7

СИГснимав7 канасистемаSIGsnimav7 canasystem

Таким образом, предложенная позволяет повысить помехоустойчивость.Thus, the proposed allows to increase noise immunity.

Система работает следующим образом. . Сигналы от датчиков 1,2 первого и второго каналов поступают в перемножитель 3, снимаемый сигнал подвергается преобразованию в блоке 4 нелинейного преобразования. Сигнал с выхода последнего в амплитудном модуляторе 27 модулирует по амплитуде промежуточную частоту, поступающую через фазосдвигающий (на 90°) блок 9The system operates as follows. . The signals from the sensors 1,2 of the first and second channels enter the multiplier 3, the captured signal is converted in block 4 of the nonlinear conversion. The signal from the output of the latter in the amplitude modulator 27 modulates in amplitude the intermediate frequency supplied through the phase shifting (90 °) unit 9

Claims

The invention relates to a technique of communication and can be used to build joint systems of stereo broadcasting, operating in the amplitude modulation mode at medium waves, as well as for stereo broadcasting in networks of multi-channel wired broadcasting, the known transmission system of stereo signals, containing sensors on the transmitting side The signals of the first and second channels, the outputs of which through a multiplier are connected to the output of the nonlinear conversion unit, as well as an intermediate generator frequency, the outputs of which are connected through the first amplitude modulator to the first input of the adder and through series-connected phase-shifting unit and the second amplitude ttop, y тор tor to the second input of the adder, and on the receiving side are series-connected bandpass filter and a limiting amplifier whose output under the keys directly to the input of the synchronous detector of the first channel, and through phase shifting a block to the input of the synchronous detector of the second channel, with the input of a bandpass filter and other inputs of synchronous children tori first and second channels merged f ij. The known system has low noise immunity, because The insertion of the notch filters results in the suppression of a narrow frequency band in the transmitted signal, which reduces the quality of the broadcast. In addition, it does not eliminate non-linear distortions. The purpose of the invention is to increase noise immunity. The goal is achieved by the fact that in the transmission system of stereo signals on the transmitting side, an additional adder and detector are connected in series to each channel, as well as a block of amplitude modulators, the first, second and third inputs of which are connected respectively to the sensor outputs of the first and second channels and the outputs of the nonlinear conversion unit, and the combined fourth, fifth inputs and the sixth input, respectively, with the inputs of the first and second amplitude modulators, the other inputs of which they are connected respectively to the outputs of the first and second channel detectors, and an amplitude detector, a sum total difference converter and sequentially combined quadrature detector of the first channel and a phase inverter, sequentially connected quadrature detector of the second channel, adder and divider are inputted to the receiving side. voltage, the output of which is connected to the input of the total differential converter, the other input of which is connected to another | the input of the voltage divider and the output of the aplitud detector, the input of which is connected to other inputs of the synchronous detectors of the first and second channels, the outputs of which are connected respectively to the inputs of the quadrature detectors; FIG. 1 is a structural electrical circuit diagram of the transmitting side of the proposed system in FIG. 2 - the same, the receiving side. The stereo signal transmission system contains sensors 1.2 of the first and second channels on the transmitting side, multiplier 3, nonlinear conversion unit 4, intermediate frequency generator 5, amplitude modulators 6.7, adder 8, phase shifter 9, adders 10, P, detector G 12.13, block 14 amplitude modulators, and on the receiving side a band-pass filter 15, amplifier-limiter 16, synchronous detectors 7.18, phase-shifting block 19, amplitude detector 2 total differential converter 21, quadrature detectors 22.23, phase inverter 24 ummator 25, divider 26, voltage block 14 and the amplitude modulator comprises amplitude modulators 27-29. The system works in the following way. The signals from the sensors 1.2 of the first and second channels are fed to the multiplier 3, the removed signal is subjected to conversion in block 4 of the nonlinear conversion. The signal from the output of the latter in the amplitude modulator 27 modulates in amplitude the intermediate frequency supplied through the phase-shifting (by 90) block 9 from the generator 5 of the intermediate frequency. The signals from sensors I and 2 of the first and second channels in the amplitude modulators 28 and 29 modulate in amplitude the frequency coming from the intermediate frequency generator 5. In each adder 10 and I, there are two amplitude modulated signals in quadrature. The quadrature modulated oscillations fall into the detectors 2.13, and the receiving signal in the amplitude modulator 6 modulates the intermediate frequency from the oscillator 5. Similarly, in the modulator 7, the intermediate frequency is modulated by the amplitude, shifted by 90 by the phase-shifting unit U. Cig-. The signals from the amplitude modulators 6 and 7 are added in the adder 8. In the stereo receiver, the signal E of the intermediate frequency amplifier is fed to the bluetooth detectors 17 and 18, the amplitude detector 20 and to the strip filter I5, separating the intermediate frequency, to the output of which is connected an amplifier a limiter 16 connected by an output to the control input of the synchronous detector 17 directly, and to the input of the detector 18 via a phase-shifting (by 90) block 19. The outputs of the detectors 17 and 18 are connected to quadrature detectors 22 to 23. To the adder 25 signal; w from detector 22 comes directly, and from detector 23 through a phase inverter 24. Signals from adder 25 and amplitude detector 20 arrive at voltage divider 26. Signal from detector 20 is fed to the first input of the sum-time input converter 21, and to the second input The signal from the output of the divider is received. The signals from the first and second channels are removed from the outputs of the single-differential converter 21. Thus, the proposed system allows an increase in noise immunity. Claims of the Invention A stereo signal transmission system comprising sensors of the first and second channels on the transmitting line, the outputs of which are connected through a multiplier to the input of the nonlinear conversion unit, as well as an intermediate frequency generator. the outputs of which are connected via the first amplitude modulator to the first input of the adder and through series-connected phase-shifting unit and the second amplitude modulator to the second input of the adder, and on the receiving side are series-connected bandpass filter and amplifier-limiter, the output of which is connected directly to the input the synchronous detector of the first channel and through the phase-shifting unit to the input of the synchronous detector of the second channel, with the input of the bandpass filter and other inputs of the synchronous detectors of the first and BTO channels are combined, characterized in that, in order to improve noise immunity, on the transmitting side, in series, an additional connected adder and detector are introduced in each channel, as well as a block of amplitude modulators, the first, second and third inputs of which are connected respectively to the sensor outputs signals of the first and second channels and the output of the nonlinear conversion unit, and the combined fourth, fifth, and sixth inputs respectively with the inputs of the first and second amplitude modulators, other inputs which are connected respectively with the outputs of the detectors of the first and second channels, and an amplitude detector, a total converter and series-connected quadrature detector of the first channel and a phase inverter, a series-connected quadrature detector of the second channel, the adder and divider voltage, whose output connected to the input of the total differential converter, another input of which is connected to another input of the voltage divider to the output of the amplitude detector, the input to orogo connected to the other inputs of the synchronous detectors of the first and second channels, vyhodal which are respectively connected to the inputs of the quadrature detectors. Sources of information taken into account in the examination 1. The author's certificate of the USSR 603132, cl. H 04H -5/00, 1976 (prototype))

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