SU1363503A1 - Apparatus for transmitting and receiving a wide=band signal - Google Patents

Abstract

The invention relates to radio engineering and communications, and m. used in recording. The aim of the invention is to narrow the band of sig (L ..-. J

Description

over a communication channel. The first analyzer 1, the first converter 20 and the mixer 19 are sequentially connected to the device, and the analyzers 26 and 36, the second converter 21 and the synthesizer 43 are inserted at the receiving side. The device contains the first analyzer 1 consisting of a quadrature phase shifter 2, two

one

The invention relates to radio engineering and communications and can be used in sound recordings.

The purpose of the invention is to reduce the frequency band of a signal transmitted over a communication channel.

The drawing shows a structural electrical circuit of a device for transmitting and receiving a wideband audio signal.

The device contains the first analyzer 1, consisting of a quadrature phase shifter 2, first 3 and second 4 quadratic detectors, first 5 and second 6 differentiating units, first 7 and second 8 multipliers, subtractor 9, adder 10, unit 11 for extracting the square root and unit 12 dividing modulator 13 consisting of low-pass filter 14, amplitude equalizer 15, inverter 16, multiplier 17 and carrier frequency generator 18, mixer 19, first and second converters 20 and 21, each of which consists of a frequency equalizer 22, a generator a heterodyne type torus 23, an amplitude detector 24 and a low-pass filter 25, a second analyzer 26 consisting of a low-pass filter 27, a carrier frequency suppression unit 28, an amplitude limiter 29 and a carrier allocation unit 30, a detector 31 consisting of an amplitude detector 32, a carrier frequency suppression unit 33, an inverter 34 and an amplitude equalizer 35, a third analyzer 36 consisting of a quadrature phase shifter 37, a first 38 and a second 39 different squared detectors 3 and 4, two differentiating blocks 5 and 6, two multipliers 7 8, subtractor 9, the adder 10, the block 11 the square root and division unit 12; modulator 13, mixer 19, two converters 20 and 21, a second analyzer 26, a detector 31, a third analyzer 36 and a synthesizer 43. 6 Cp. f-ly, 1 ill.

2

of the fermentation units, the first 40 and second 41. multipliers and subtractor 43, as well as the synthesizer 43.

Device for transmitting and receiving

broadband beep works as follows.

The input of the first analyzer 1 beeps. From the second output of the first analyzer 1 to the input

the modulator 13 receives an envelope signal, and from its first output the input of the first converter 20 receives a signal of the instantaneous frequency function of the audio signal, from the output

The first converter 20 receives the signal of the transported frequency of the original audio signal at the input of the mixer 19, and the signal of the amplitude-modulated envelope of the source signal arrives at the second input of the mixer 19 from the output of the modulator 13. From the output of mixer 19, which is the output of the transmitter, the signals of the transported frequency and the carrier

transmitted over the communication channel to the input of the second analyzer -26. From its second output, the carrier signal arrives at the input of the detector 31; from the detector output 31, one input of the synthesizer 43 enters

envelope signal. From the first output of the second analyzer 26 to the input of the third analyzer 36 receives the signal of the transported frequency. From the output of the third analyzer 36 to the input of the second transducer 21 receives the signal function of the instantaneous transported frequency. From its output to the other input of the synthesizer 43 receives a signal equal to the instantaneous frequency

 1363503

with the original beep. From the output of the synthesizer 43, which is the output of the device, a broadband audio signal is received, equal in instantaneous amplitude and frequency to the input signal of the analyzer 1. I The first analyzer 1 works as follows.

The initial sound signal is fed to the input of the quadrature phase shifter, and at its output signals are shifted in phase by 90 °, which are fed to the first 3 and second 4 quadras, signals of the transported frequency and the amplitude-modulated carrier are simultaneously received. From the output of the communication channel, the signals arrive simultaneously at the inputs of the filter 27 and the block 30 of the second analyzer 26. From the output of the block 30, the signal of the carrier frequency arrives at the input of the amplitude

10 of the detector 32 of the detector 31, from the output of which the envelope signal enters the block 33, then through the inverter 34, the amplitude equalizer 35 to the input of the synthesizer 43, made in the form

tichnye detectors. At the output of the last 5 multipliers (amplitude modulator), signals are received to the sum output of the filter 27 through block 28, the matrix 10, and then to block 11, you receive the amplitude limiter Z9

and the amplitude limiter Z9 transpose frequency signal comes in

the input signal of which is a function of the envelope, i.e. amplitude modulation of the original audio signal. 20 The signal from the outputs of the quadrature phase shifter 2 is differentiated in the first 5 and second 6 differentiating blocks and is fed to the inputs of the first

and the amplitude limiter Z9 transpose frequency signal comes in

to the input of the quadrature phase shifter 37, with its outputs shifted by 90

the signals of this frequency are simultaneously received at the inputs of the first and second multipliers 40 and 41, from the outputs of which are the products of the post 7 signals and the second 8 multipliers, to another ° C subtractor 42. The signal

the instantaneous frequency functions from its output are fed to the input of the second converter 21, whose operation is similar to the operation of the first converter 20. From the output of the second converter 21, the signal of the frequency restored after the reverse transposition and equal in frequency to the instantaneous frequency of the original signal arrives at the second input of the synthesizer 43. In the course of the synthesizer 43, which is the output of the device, a wideband audio signal is received, coinciding with the input signal of the receiver.

These inputs are sent to the subtractor 9, and then to block 12, to another input of which a signal comes from the output of the adder 10. At the output of block 12, a signal is presented that represents instant frequency function or frequency modulation of the original audio signal. This signal: comes through frequency equalizer 22 to the input of a generator 23, made in the form of a heterodyne-type generator (at beats), from the output of which an amplitude modulated high-frequency signal is fed to an amplitude detector 24, from the output of which an input signal 25 to the signal instantaneous frequency proportional to the amplitude of the instantaneous frequency function signal at the output of the frequency corrector 22. From the output of filter 25, the signal of the transported frequency is fed to the input of the mixer 19. From the output of the block, the 11-envelope signal comes through the filter

14 to amplitude equalizer input

15 (nonlinear link), from the output of which to the inverter 16 and further to the multiplier 17, to the second input of which the generator output is connected, 18. From the output of the modulator 13, the amplitude-modulated carrier signal goes to another input of the mixer 19, from the output of to channel input

communications simultaneously receive signals of the transported frequency and the amplitude-modulated carrier. From the output of the communication channel, the signals arrive simultaneously at the inputs of the filter 27 and block 30 of the second analyzer 26. From the output of block 30, the signal of the carrier frequency arrives at the input of the amplitude

the detector 32 of the detector 31, from the output of which the envelope signal enters the block 33, then through the inverter 34, the amplitude equalizer 35 to the input of the synthesizer 43, made in the form

the multiplier (amplitude modulator), the output of the filter 27 through the block 28 amplitude limiter Z9

and the amplitude limiter Z9 transpose frequency signal comes in

to the input of the quadrature phase shifter 37, with its outputs shifted by 90

   ° "subtractor 42. Signal

thirty

35

40

the instantaneous frequency function from its output is fed to the input of the second converter 21, whose operation is similar to the operation of the first converter 20. From the output of the second converter 21 to the second input of the synthesizer 43 receives a signal restored after reverse transposition and equal in frequency to the instantaneous frequency of the original signal. At the output of the synthesizer 43, which is the output of the device, a broadband audio signal is received, which coincides with the input signal of the receiver.

F o

about

rmula of invention

Claims (7)

1. An apparatus for transmitting and receiving a wideband audio signal, comprising a modulator on the transmitting side and a detector on the receiving side, characterized in that, in order to narrow down the frequency band of the signal transmitted over the communication channel, the first analyzer connected in series, the first converter and the mixer, the second input of which is connected to the modulator output, the input of which is connected to the second output of the first analyzer, and the second and third analyzers connected in series on the receiving side, the second converter and synthesizer, the second input of which is connected out house of the detector, the input of which is connected to the second output of the second analyzer. 2, The device according to claim 1, characterized in that the first analyzer contains a quadrature phase shifter, the first output of which is connected to the combined inputs of the first quadratic detector, the first differentiating unit and the first multiplier, the second input of which is connected to the output of the second differentiating unit, the second output the quadrature phase shifter is connected to the combined inputs of the second quadratic detector, the second differentiating unit and the second multiplier, the second input of which is connected to the output of the first differential The output unit, the outputs of the first and second quadratic detectors, tori are connected to the first and second inputs of the adder, the output of which is connected to the combined inputs of the square root extraction unit and the division unit, the second input of which is connected to the output of the subtractor, the first and second inputs of which are connected to the outputs, respectively the first and second multipliers, and the input of the quadrature phase shifter is the input of the first analyzer, the first and second outputs of which are respectively the outputs of the dividing units and extracted Yeni square root. 3, the apparatus of claim 1, wherein the first and second transducers include serially connected frequency equalizer, heterodyne type generator, amplitude detector and low pass filter, the output of which is the output of the corresponding transducer whose input is the input of the frequency equalizer. . , 4, The device according to claim 1, about tl and - that the modulator contains serially connected Compiled by V. Shevtsov Editor T, Lazorenro Tehred M. Hodanić Order 6382/55 Circulation 636 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d. 4/5 Production and printing company, Uzhgorod, st. Project, 4 five a low-pass filter, an amplitude equalizer, an inverter and a multiplier, to the second input of which the output of the carrier frequency generator is connected, and the input of the low-pass filter is the input of the modulator, the output of which is the output of the multiplier. 5. The device according to claim 1, characterized in that the second analyzer comprises a low-pass filter connected in series, a carrier frequency suppression unit and an amplitude limiter whose output is the first output of the second analyzer, the second output of which is the output of the carrier separation unit, the input which is combined with the input of the low-pass filter and is the input of the second analyzer. 6. A device according to claim 1, characterized in that the third analyzer comprises a quadrature phase shifter, the first and second outputs of which are attached to the inputs of the first and second differentiating units, the outputs of which are connected to the first inputs of the corresponding first and second multipliers, the outputs of which are connected to the respective first and second inputs of the subtractor, the output of which is the output of the third analyzer, whose input is the input of the quadrature phase shifter, the first and second outputs of which with the second inputs of the second and first multipliers, respectively. 7. The device according to Claim 1, about tl and h a0 five 0 This is so that the Detector contains a series-connected amplitude detector, a block of suppressing a carrier frequency, an inverter and an amplitude equalizer, the output of which is the output of the detector, whose input is the input of the amplitude detector. Proofreader V.Vut ha