SU1548853A1 - Device for checking amplitude-frequency characteristics - Google Patents

Abstract

The invention relates to telecommunications. The purpose of the invention is to increase the reliability of the control. The device contains on the transmitting side a functional r-r 1, r-r 2 control signal, counter 3, adder 4, matching el-5, and on the receiving side - matching el-6, filters 7 and 9, amplitude detector 8, shapers 10 and 17 pulses, elec tants of matches 11 and 16, counter 12, memory block 13, decoder 14, trigger 15, r.r 18 clock pulses, and indicator block 19. This device provides for its operation in the phase shift mode output signal at which on the screen of the indicator unit 19 is displayed the frequency response of the controlled line 20. At the end of this mode, the device enters the communication mode. For this purpose, frequency modulator 21, microphone unit 22, frequency demodulator 23, amplifier 24 and electroacoustic transducer 25 are used to form the communication channel with frequency modulation. 2 Il.

Description

The invention relates to telecommunications engineering and can be used to control and adjust the amplitude-frequency characteristic (AFC) of channels and paths of transmission systems.

The purpose of the invention is to increase the reliability of the control.

Figure 1 shows the structural electrical circuit of the device; Fig. 2 illustrates stress plots showing its operation.

The device for controlling the amplitude-frequency characteristic contains on the transmitting side a function generator 1, a pilot signal generator consisting of a converter

2.1 and oscillating frequency generator 2.2, counter 3, adder 4, matching element 5, on the receiving side - matching element 6, first filter 7, amplitude detector 8, second filter 9, first driver 10 pulses, first coincidence element 11, counter 12, memory block 13, decoder 14, trigger 15, second matching element 16, second pulse generator 17, clock pulse generator 18, indicator unit 19, also monitored communication line 20 is shown, frequency modulator 21, microphone unit 22, frequency demodulator 23, amplifier

SP

J

00 00

ate

with

24 and an electroacoustic transducer 25 performing the communication mode.

The device works as follows.

On the transmitting side, the control input of the generator 2 (to the input of the converter 2.1) from the counter 3 receives a linearly varying code (FIG. 2B). This code is assigned to the code of the generator 2, the output of which (output generator 2.2) variable frequency signal is generated in the frequency response control range: (FO, F1). This signal through the adder 4 and the matching element 5 enters as a control to the controlled link 20.

At the same time, the code from the output of the counter 3 is fed to the phase control input of the function generator 1t. At one output of the driver 1, connected to the control input of the counter 3, pulses (fig 2B) are generated, changing the state of the counter 3, and at another its output - phase-shift oscillation (Fig. 2A) "Phase-manipulated oscillation through adder 4 and matching element 5 enters the controlled communication line 20, the carrier frequency of these oscillations is F, Frequency F is chosen so that the spectrum of the phase-manipulated oscillation does not fall within the range (F06 F1), and the attenuation in the controlled link 20 at this frequency is obviously less than at frequencies (FO, F1).

On the receiving side, the signal passes the matching element 6 and is fed to the inputs of the first 7 and second 9 filters. The first filter 7 selects the spectral components in the band (FQ, F1), attenuated in the controlled link 20 with weights determined by the frequency response. The amplitude of these components is selected by the amplitude detector 8 and fed to the first input of the indicator unit 19. Phase-manipulated the signal is extracted by the second filter 9 and is fed to the first driver 10 pulses, the output of which is produced with pulses corresponding to zero phase-shift keyed signal (Fig. 2D). These pulses through one of the elements 11 (16) of the match arrive either at the input of the counter 12, or at the input of the second shaper 17 pulses. The first 11 hours of the second 16 match elements are controlled by a trigger 15, which opens the first match element 11 at the moment the device is turned on. Therefore, the pulses from the output of the first driver 10 pulses pass to the first input of the counter 12. The initial state of the counter 12 corresponds to recording the integer part of the number l / F T + N, where T is the period of the pulse sequence (Figure 2D) at the output of the generator 18; N is a positive integer. The decoder 14 generates pulses (FIG. 2E) if the state of the counter 12 coincides with some specified value, for example zero. Thus, if the counter 12 is pulsed back (Fig. 2D), the code at its output is not rewritten into the memory unit 13. If the state of the counter 12 is zero, the trigger is thrown (Fig. 2G), prohibiting the passage of pulses (Fig. 2D) through the first coincidence element 11 and allowing them to pass through the second coincidence element 16. The first pulse after the moment of manipulation passes from the output of the first shaper 10 pulses through the second matching element 16 (Fig. 23) to the input of the memory block 13 and allows the information about the state of the counter 12 to be written to it. The same pulse is delayed in the second shaper 17 of the pulses (FIG. 2I), after which trigger 15 is reset (FIG. 2K) and, having passed through the first matching element 11 that has opened, sets counter 12 to the initial state. Thus, the information is rewritten to the memory unit 13 only by pulses (Fig.2G) f following the phase manipulation moment (Fig.2A). "At the output of the counter 12, a code is generated that is stored in the memory block 13 and transmitted to the indicator block 19, on the screen of which the frequency response of the monitored line / 20 is displayed. In the communication mode, the frequency modulator 21 is turned on from the third output of the function generator 1 and the phase manipulation mode of the output signal is turned off. The signal from the microphone unit 22 through the frequency modulator 21 is fed to

5 15488536

auxiliary input to the functional side - serially connected to the generator 1. Frequency modulated matching element, input to

The output signal of the functional generator 1 through the adder 4, matching element 5, controlled by communication line 20, matching element 6, second filter 9, frequency demodulator 23 and amplifier 24 is fed to electroacoustic converter 25. Thus, a communication channel is formed frequency modulated.

Claims (1)

Invention Formula A device for monitoring the amplitude-frequency characteristic containing on the transmitting side a pilot signal generator, and on the receiving side an amplitude detector, memory indicator 20, the output of which is connected to the unit, the first driver to the second input of the indicator unit. The 15th matching element, the input is connected to the output of the first pulse shaper, the counter, the counting input of which is connected to the output of the clock pulse pulser, and a block and a decoder, characterized in that, in order to increase the reliability of the control, a counter is inserted on the transmitting side, connected in series Function generator, adder, the second input of which is connected to the output of the pilot signal generator, and matching element whose output is the input controlled communication lines, the output of the counter is connected to the control inputs of the pilot signal generator, a function generator, The second output of which is connected to 35Ni, the output of which is connected to the syn- numerical input of the counter, and to the receiving-timing input of the memory unit. a memory whose output is connected to the second input of the indicator unit. the first filter, the output of which is connected to the input of the amplitude detector, the output of which is connected to the first input of the indicator unit, the second filter, the input and output of which are connected respectively to the output of the matching element and the input of the first pulse shaper, generator clock pulses, successively connected by the first coincidence element, the input of which is connected to the output of the first pulse driver, the counter, the counting input of which is connected to the output of the generator ra clock pulses and block serially connected trigger, the first input of which is connected to the output of the decoder, the second element the match and the second pulse shaper, the output of which is connected to the second input of the first element of the match and the second input of the trigger, the second output of which is connected to the third input of the first coincidence element, the output of the counter is connected to the input of the decoder, the output of the first pulse shaper is connected to the second one in the course of the second coincidence element tpi / ncc. zenepi yyhad counts 3.1 IIIZZ j output (Parm I | I I I I I I I I I I I I I I I I I I I IO I I I I 111111 I I I I I MM No. 11-II. " Output , deishduwwj cocmff Benefit trig at p. 15 byyud scheme coin. sixteen Oyhod Ygggg DLP191 output and Jj c Well Editor N.Lazarenko Compiled by E.Golub Tehred L. Serdyukova Proofreader N. Revska Order 145 Circulation 525 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Jj c Well Subscription