SU946005A1 - Device for measuring quantization characteristic of pulse-code modulated signal transmitter - Google Patents

Description

/ 1 The invention relates to a measurement technique in communication channels and can be used to measure the characteristics of channeling equipment with positive-code modulation (PCM). It is known a device for measuring the quantization characteristic of a PCM signal transmitter, which contains a regenerator, the first output of which is connected to the first input of the attenuator via serially connected frequency dividers and a LOW frequency filter, and the second output of the generator through a serially connected code converter, synchronizer, and The channel number setting unit is connected to the first input of the channel selector, the second input of which is combined with the first input of the synchronizer, the second input of which is combined with the second input the code converter and with the first input of the frequency divider, the second input of which is connected to the second output of the synchronizer, the code combination selector and the indicator 1. However, the known device has low accuracy and long measurement time. The purpose of the invention is to increase the accuracy while reducing the measurement time. The goal is achieved in that a device for measuring the quantization characteristic of a PCM transmitter signal containing jjereHeJDaTop, the first output of which is connected to the first input of the attenuator through serially connected frequency divider and low pass filter, and the second output of the regenerator through serially connected code converter, the synchronizer and the channel number setting unit are connected to the first input of the channel selector, the second input of which is combined with the first input of the synchronizer, the second input of which Combined with the second input of the code converter and with the first "move, divide the frequency n, the second input of which

connected to the second output of the synchronizer, code combination selector and indicator, control bindings, key, first and second memory bins, quantization thresholds otkponeniye calculation unit, asymmetry decoding decoder, segment decoder, operating point position analyzer, three elements And, four switches, four counters and a reversible counter unit, with the output of the Frequency Divider through the first And element, the first switch and the first counter connected to the second attenuator input, the output of which is It is connected to the first key input, the second input of which is connected to the first output of the control unit, the second output of which is connected to the third input of the synchronizer, the third output of which is connected to the first input of the unit at the right j of the third and fourth outputs of which are connected respectively to the reset input and with the installation input of the first counter, the first and second outputs of the channel selector, respectively, through the second and

the third elements And connected to the entrance. selector code combinations, the first and second outputs of which, respectively, through the second and third counters are connected respectively to the second and third inputs of the control unit, the fifth, sixth, seventh and eighth outputs of which are connected respectively to the second inputs of the second and third episodes And, with the combined the installation inputs of the second and third counters and with the installation input of the block of reversible meters, the signal input of which is connected to the third output of the code combination selector, the fourth output of which is soy inn with the input of the first memory block whose output is connected to the inputs of the asymmetry sign decoder and segment decoder, the outputs of which are connected respectively to the third input of the channel collector and to the control input of the first switch, the signal input of which is combined with the first input of the second switch, the output of which through the fourth counter is connected to the first input of the block for calculating deviations of the quantization thresholds, the output of which through the second memory block is connected to the input of the indicator, the fifth and sixth outputs of the selector code combinations are connected respectively with the combined first and combined second inputs of the third and fourth switches, the outputs of which are connected respectively with the second and third inputs of the second switch, the fourth input of which is combined with the installation inputs of the first switch and the first counter, with the second input of the first element H and with the reset input of the fourth counter, and the first and second outputs of the reversible counter block are connected respectively to the second input of the deviation calculator quantization horns and with the signal input of the operating point position analyzer, the output of which is connected to the fourth input of the control unit, you-Nines from ninth to thirteenth of which are connected respectively to the combined third inputs of the third and fourth switches, to the control point of the working point position analyzer and the control inputs of the quantization threshold deviation calculator, the second memory block, and the indicator.

The drawing shows a structural electrical circuit of the proposed device.

A device for measuring the quantization characteristic of a PCM signal transmitter contains a regenerator 1, a frequency divider 2 ,. low-pass filter 3, key 4, control unit 5, code converter 6, synchronizer 7, first element 8, attenuator 9, channel number setting unit 1O, first switch 11, first counter 12, channel selector 13, asymmetry decoder 14, the decoder 15 of the segment, the analyzer 16 position of the working point, the second and third elements And 17 and 18, respectively, the first memory block 19, the selector 2O code combinations, the second, third and fourth switches 21-23, respectively, the second, third and fourth counters 24- 26 respectively, block 27 reverse midrange detectors, a block 28 for calculating deviations of quantization thresholds, a second memory block 29, an indicator 30.

The device works as follows.

The digital signal from the output of the transmitting half-set is fed to the input of the regenerator 1, which converts the digital signal into a unipolar form and sets the clock frequency of the signal. A digital signal in a unipolar form is fed to the input of a converter 6, which converts the serial code of a digital PCM signal into a parallel one using

incoming clock pulses allocated to the regenerators 1.

Clock impulses are also fed to the synchronizer 7 to which a digital signal is received in parapet form from the output of converter 6. Synchronizer 7 synchronizes the digital PCM signal and outputs the signals necessary for the combination of the measured channel to shift the harmonic signal phase with a frequency of 2 kHz, as well as for synchronizing the operation of the control unit 5, control signals from which are also fed to the synchronizer 7.

A harmonic signal with a frequency of 2 kHz is formed by dividing the clock frequency of the digital PCM signal using a 2 frequency divider. The operation of the splitter 2 frequency is synchronized with signals

Lock 5 control. Thus, the 2 kHz frequency signal at the output of Divider 2 frequency can be shifted in time by the signal from control unit 5. This mixing occurs in a jump: the value of the jump is equal to one clock interval of the digital PCM signal. A pulse signal with a frequency of 2 kHz from the output of the divider 2 frequency is fed to a low-pass filter 3, which converts the pulse signal into a harmonic signal with a frequency of 2 kHz. This signal is through an attenuator 9, made in the form of a controlled scale converter, and through the key 4 is fed to the input of the measured channel of the transmitting half of the set. The time mixing of a pulse signal with a frequency of 2 kHz at the output of frequency divider 2 determines the change in the initial phase of the harmonic signal with a frequency of 2 kHz at the input of the measured channel of the transmitting half-set.

The attenuator transfer ratio 9 is determined by the value of the number recorded in the first counter 12, which counts the impulses received from the output of the divider 2 frequencies through the first element 8 and the first switch 11.

Thus, at the output of the divider 2 frequency, the pulses follow each other at a frequency of 2 kHz, the attenuation coefficient of the attenuator 9 and, consequently, the signal level at the input of the measured channel of the transmitting half-set changes abruptly, from period to period of the harmonic signal with frequency of 2 kHz. The jump value corresponding to the change in the number written to the first

the counter 12, per unit, we denote L o / and where o is the nominal value of the quantization step in the first segment of the quantization characteristic of the transmitting half-set; y is an integer.

The channel pulses required to separate from the digital PCM signal the kD combinations of a specific channel. They come from the synchronizer 7 to the block 10, with the number of the channel being measured put with a slash. Channel impugances necessary to separate the code combinations of the measured channel come from block 10 to selector 13

BUT,

A channel also receives a digital PCM signal in parallel form from the output of the converter 6. From this digital signal, the channel selector 13 selects the code combinations of the measured channel. In this case, the first and all further odd code combinations of the measured channel arrive at the output A of the channel selector 13, and all the even combinations go to the output B of the channel selector 13.

From the output A or from the output B of the selector 13 of the channel, code combinations through the second or third elements AND controlled by signals from the control unit 5,

are fed to the input of the Selector 2O code combinations, which is

a number of coincidence circuits (not shown) with a common input and separate outputs, which are equal to the possible number of different code combinations in the digital PCM signal, i.e. the number of steps of the quantization characteristic that for systems

with compounding law, 6 / ji and 8-bit coding, it is equal to 25.6. Each of the matching schemes is configured for a certain code combination, and when a code combination 20 arrives at the input of the selector 20 (a defined code combination, a pulse appears at the corresponding output of the selector 2O of the code combinations.

The outputs of the selector 2O code combinations can be designated by numbers, which in binary form are the corresponding code combinations. Taking into account that the high bit of each code combo is significant, let us designate the outputs of the selector 2O codex 1X combinations by numbers from +127 to -127.

To each of the outputs of the selector 20 code combinations attached to the input of the counter, counting the pulses received from this output, i.e. the number of data code combinations received at the input of the selector 2O code combinations | cn. Of these counters, everything except the counters 24 and 25, which are connected, respectively, with outputs from +127 to

-127 are reversible and are included in bpok 27 reversible counters.

Before starting the measurement of the quantization characteristic, it is necessary to adjust the harmonic signal frequency phase at a frequency of 2 kHz at the input of the measured channel of the transducer so that when sampling the signal by time in the measured channel of four samples that fit in one signal period, two correspond to the moments transmission through zero, and two - to the amplitude values of the signal of different polarities. The criterion for the correct installation of the initial phase is the coincidence of the code combinations at the output A of the selector 13 channel with and without the output of the measured channel of the transmitter of a harmonic signal with a frequency of 2 kHz.

It should be taken into account that due to the effect on the quantizer input of an unoccupied channel in the digital signal at the transmitter output, in the absence of a signal, two or even more different code combinations may be present at its input. The number of these code combinations and their value depend on the position of the operating point of the quantizer and, therefore, are not known in advance.

For the operation of setting the initial phase, it is advisable to use the most common of the code combinations of the empty channel.

After connecting the proposed device to the transmitter to be measured, the first operation is to synchronize the digital PCM signal input to the device from the output of the transmitter.

At the end of the operation, a signal about this comes from the synchronizer 7 to the control unit 5 (c). The control unit 4 sends signals (e, g) to the second and third elements AND 17 and 18.

Key 4 is open and no signal is input to the input channel of the transmitter. The code combinations of the unoccupied channel from the outputs A and B of the channel selector 13 through the second and third elements And arrive at the input of the selector 20 code combinations. The number of received code combinations is recorded in reversible meters connected to the corresponding outputs of the code selector.

combinations and working on addition. After a period of time required for the receipt of N code combinations of the unoccupied channel at the output of the selector of code combinations 2O, the second and third elements AND close to signals from the control unit (6, G).

Since the shift of the working point of the quantizer, regardless of polarity, does not bring the operating point beyond the first half of the working segment of the quantization characteristic, the determination of the most frequently encountered code combination, the empty channel is performed in the proposed device within the first 16 steps for each polarity. The output of reversible counter block 27 (d-), representing the output of reversible counters connected to the outputs 0 of the selector 20 of code combinations from +15 to -15, is connected to the input of the analyzer 16 of the operating point position, which, after closing the second and third elements There is no counter number, the largest number was recorded in 5 hours. Let's call it counter M.

After that, the signal from the control unit 5 in the first counter 12 records the number that determines the level of the signal sent to the input of the measured channel of the transmitter for the installation operation — the initial phase.

The value of the phase jump when setting the initial phase of the measuring signal 5 is equal to one clock interval of the digital PCM signal. For a harmonic signal with a frequency of 2 kHz, this corresponds to a shift (phase by

 When the initial phase is set, the signal level is chosen such that regardless of the initial value of the initial phase 1 with a step change in phase 5 with the specified jump value, the amplitude of one of the signal samples at the input of the quantizer is sure to be within the quantization point in which the operating point is located. Moreover, the number,, d recorded in the first counter 12 should not exceed 81 AND- According to the signal from control unit 5, key 4 closes and the second element opens And 17. The harmonic signal from the output of attenuator 9 is fed to the input of the measured canap of the transmitter.

Claims (1)

The first and subsequent odd code combinations of the measured channel come from the output A of the channel selector 13 to the input of the separator 20 of the code combinations.  According to the signals from the control unit (a), the signals coming from synchronizer 7 to frequency divider 2 shift the phase of the harmonic signal at the input of the measured channel of the transmitter.  The analyzer 16 of the position of the working point captures the first change in the number recorded in the reversible counter M, and sprinkles the signal on the control unit 5.  According to the signal from control unit 5, the phase change of the signal at the output of the frequency divider 2 is stopped, the second element AND closes.  The desired value of the initial phase is established.  Thereafter, the operation of actually measuring the quantization characteristic begins.  According to the signal from the control unit 5, nepjvy 12 and the fourth 26 counters are set to the zero position, the number And is written to the reversible counters included in block 27, and these counters overlap the operation by. subtraction, and counters 24 and 25 record the number of p-I, where p is the capacity of the counter.  In addition, according to the signal from control unit 5 (b), the fourth switch 23 connects the output of the first element 8 (2,) to the input of the fourth counter 26.  According to the signal from the control unit 5 (K, the switches 23 and 22 are set to a position that depends on the number of the reversible counter M recorded in the analyzer 16 of the operating point position.  If the reversing counter I is connected to one of the negative outputs of the selector 20 of code combinations, the switches 23 and 22 are set to the position where the output O of the selector 2O of the cs combinations is connected to one of the control inputs of the second switch 21, and the output -O of the selector 2O of the code The combinations are connected to one of the operating inputs of the second switch 21.  If the reversible counter M is connected to one of the positive outputs of the selector 20 of codewords, the switches 23 and 22 are set to the opposite position.  Also on signals from control unit 5 (G ,. 1c) the corresponding elements of I are opened. The code combinations from the output B of the selector 13 of the channel, corresponding to the amplitude values of the harmonic signal with a frequency of 2 kHz, are received at the input of the code selector 2O.  A pulse signal with a frequency of 2 kHz from the output of the core 2 frequencies through the first element And the first switch 11 is fed to the first counter 12.  The first switch 11 is set by the signal from the control unit 5 (f) in such a position that the pulses arrive at the counting input of the first (lower) digit of the first counter 12.  The pulses arriving at the first counter 12 with a frequency of 2 kHz cause the number in the first counter 12 every 5OO μs to increase by one, starting from zero, thereby increasing the amplitude of the harmonic signal at the output of the controlled scale converter by yes and 12 , also starting from zero. Thus, the samples of the amplitude values of both polarities of the signal abruptly increase from period to period of the signal envelope, testing the quantization characteristic, starting from. working point.  While the value of the reference of this polarity is within the -i -th quantization step, at the output B of the selector 13 of the channel, every 50O µs appears — a code combination that is received. the input of the selector 20 code combinations, causes the appearance of a pulse at the -M output of the selector 2O of code combinations.  This impulse is fed to the input of the i-ro reversible counter, working on the subtraction, and reduces the number recorded in this counter by one.  If i -and quantization quantization has a nominal value, it is passed in 12 jumps, and the number recorded in the -th reversing counter will vanish.  If the size of the i-th quantization step is different from the nominal one, in the h-th reversal counter at the end of the measurement there will be a recorded number equal to the number of jumps by which the actual step size is greater or less than the nominal one. In the first case this number is negative by the second positive.  The error in determining the step size in this case does not exceed the value of a single jump.  The effect of noise present at the input of the quantizer must be taken into account.  The instantaneous value of the noise at the moment of counting is added to the amplitude value of the signal, thereby changing the value of the resulting count.  This may lead to.  11 that the noise perturbation will deduce the amplitude value corresponding to the ith quantization step in the (-i + 1) -th or (-r--1) -th step.  However, the influence of noise can also output samples of amplitude values corresponding to () + 1) -th and (-i - 1) -th squares of a quarter to the i -th step.  Therefore, at a sufficiently large value of the number I, it can be considered that, due to statistics, the effect of noise practically does not introduce errors into the determination of the values of quantization steps.  One could go through the whole quantization characteristic with a constant value of the jump in the amplitude value of the harmonic signal from period to period.  At the same time, the ratio between the jump value and the nominal quantization step size would change from segment to segment of the quantization characteristic, since the nominal quantization step size is doubled when moving from segment to segment and, for example, in the extreme (seventh) segment dp of the signal polarity, the nominal step size is 64 times larger than in the first segment, closest to the origin.  However, dp of obtaining an acceptable error when estimating quantization steps in the first segment of a numerical segment of this segment should be sufficiently large, and thus, while maintaining the jump value equal to DS |, a rather significant number of jumps would be required to estimate all steps of the quantization characteristic which would, in turn, lead to a very long measurement time.  Therefore, it is advisable to maintain the relationship between the jump value and the nominal quantization step size constant in all segments, changing the jump value is proportional to the change in the nominal quantization step size when going from segment to segment.  It should be borne in mind that due to the asymmetry of the quantization characteristic over half waves, a situation may arise in which the count value of one polarity already reaches the boundary of the next segment, and the count value of the other polarity remains within the previous segment.  In such a case, for one full signal it would be necessary to increase the value of the jump a dn by another - to leave it unchanged. To do this, we would have to alternately study the positive and negative 6 branches of the quantization characteristic, which would double the measurement time.  It is possible to obtain the desired effect under the condition of simultaneous investigation of both branches of the characteristic, if, when one of the polarities reaches the boundary of the next segment, the jump value is not changed, and not to allow every second code combination of the given polarity to the input of the selector 20 of the code-combination, so that the registration of code combinations of this polarity by reversible counters at the output of the selector 20 of code combinations is performed every two jumps, which is equivalent to doubling the value of the jump.  And only after the counting of the opposite polarity also reaches the boundary of the segment, the jump value is doubled, and all code combinations corresponding to the amplitude values of the signal of both polarities begin to arrive at the input of the selector 20 of the code combinations.  This is done as follows.  All outputs of the selector 20 code combinations corresponding to the lower code combinations of each of the segments of both polarities, except the first, are connected to the corresponding inputs of the first memory block 19.  The first memory block 19 memorizes the fact of the first arrival of a pulse on any of its inputs.  The state of the first memory block 19 is analyzed by the decoder 14 asymmetry signs and the decoder 15 of the segment.  If, for example, a pulse appears on the +32 selector 20 of a code combination, while the output of -32 pulses is not yet present, the decoder 14 has an asymmetry sign based on co; One hundred or first memory block 19 provides the selector 13 of the channel with a signal that it is forbidden to pass every second code combination of positive polarity to the output B of the selector 13 of the channel.  When the first pulse appears and at the output -32 of the selector 2O of code combinations and the state of the first memory block 19, the asymmetry sign decoder accordingly reduces the signal to the first switch 11, as a result of which the first switch 11 turns off the output of the first And 8 element from the counting input of the first bit of the first counter 12 and connects it to the counting input of the second bit of the first one, counter 12, thereby doubling the value of the jump in the amplitude of the signal at the output of the attenuator 9.  A similar process occurs during transitions to subsequent segments.  The process of hopping the level at the output of the measured channel of the transmitter continues until an overflow occurs in the second and third counters 24 and 25, t. e.  until at each of the outputs +127 and -127 of the selector 20, the code combinations are no longer equal to pulses and, consequently, for both half-waves the level of overload will not be exceeded.  The overflow signals of the counters 24 and 25 are sent to the corresponding inputs of the control unit 5 (A, m). When both of these signals arrive, the key 4 and the corresponding AND elements are disconnected by the signal from the control unit 5. As a result, in each of the reversible counters of the block 27 there is a record In this case, the number that determines the deviation of the size of this quantization step from the nominal value.  The next task is to determine the values of the quantization thresholds or the deviations of these thresholds from the nominal values.  Deviations of quantization thresholds from nominal values may be due to two factors — deviations in the sizes of quantization steps from nominal values and a shift in the operating point of the quantizer relative to its ideal position. In case the position of the operating point is ideal, t, e.  the working point coincides with the zero quantization threshold, which is the boundary between the quantization steps + O and -O. , the deviation of the V th threshold of quantization of a given polarity can be defined as the sum of the deviations of the polarity of ions of a given polarity from zero to (i-1) -th inclusive.  If there is a mixing of the working point, an amendment to this offset must be introduced into the obtained result.  Information on the deviations of the individual quantization steps is contained in the reversible counters of block 27. It remains to determine the value of the operating point offset.  By preliminarily determining with the help of the analyzer 16 the position of the working point, which code combination is most often encountered from the code combinations of the empty channel, we thereby determine 9,514 in which quantization step the operating point is located.  However, to compute the quantization threshold deflection values, it is necessary to determine the offset value of the operating point with much greater accuracy.  Therefore, a preliminary determination of the position of the operating point is used only to obtain information about the c mark. Space, The operation of determining the working point mixing begins simultaneously with the determination of the values of the deviations of the quantization steps.  It is necessary to determine the chiolo jumps of the amplitude value of the signal, for which the counting amplitude value of the signal reaches the zero quantization threshold. O, if the operating point is shifted to the negative region, or -O, if the operating point is shifted to the positive region.  However, the effect of noise can lead to a significant error in such a determination.  Imagine the zero quantization threshold, as the boundary between the (-i - 1) -th and Vth quantization steps, to which, with an abrupt increase in the signal counts, we are approaching from the (i - 1) -th step.  Adding an instantaneous noise value to a counting value can result in that while value; the count has not yet reached the boundary between the steps and is within the {-i-l) -ro step, the total value of the count and noise fails within the t-th step, which results in the appearance of the digital signal -i and code combination in the digital signal.  In order to more accurately determine the mixing of the operating point, it is necessary to additionally determine the number of jumps that are missing from the signal sample to the zero quantization threshold at the moment of the first occurrence of the -t -t code combination.  This number can be & 1 popuchei by counting the number (-i - 1) -x code combinations to the input of the selector 2O of code combinations from the moment of arrival of the first1 "-and code combination {g, Simultaneously with opening the first element AND 8 switch 23 to The signal from control unit 5 (S) connects its output to the input of the fourth counter 26, which, by the same signal, is set to the zero position.  At the input of the fourth counter 26, impulses with a frequency of 2 kHz start to arrive from the output of depot 2 frequencies simultaneously with their input to the first counter 12.  If the number of the reversible counter M recorded in the analyzer 16 of the operating point setpoint indicates that the operating point has a negative sign, the signal from control unit 5 (K) sets the switches 23 and 22 to the position at which: +0 output of code sector 20 the combination is connected to the control input of the switch 21, and the output -O to its working input.  If the number of the reversible counter M indicates a positive sign of mixing, the switches 23 and 22 are set to the opposite position.  If the operating point is mixed into the negative region, impulses from the output of the Depil 2 frequency are fed to the input of the fourth counter 26 before the first occurrence of the code combination +0 at the input of the selector 20 code combinations, which causes the appearance of the first pulse at the output + O of the selector 20 code combinations .  This pulse through the third switch 22 is fed to the control input of the second switch 21, as a result of which the second switch 21 turns off the input of the fourth counter 26 from the output of the first element 8 and connects it to the output of the third switch 23 The input of the fourth counter 26 is connected to the output - About selector 2O code combinations.  Consequently, after the first appearance of a pulse at the output +0 of the selector 2O of code combinations, the fourth counter 26 counts only the pulses that are output from the output -O of the selector 2O of code combinations.  The number recorded in the fourth counter 26, at the end of the operation of changing the level of the measuring signal, is equal to the mixing of the operating point of the quantifier, expressed in the number of jumps.  This number is required as a correction when summing the deviations of the individual quantization steps to obtain the deviations of the quantization thresholds.  This action, as well as the summation, is performed by block 28, controlled by signals from control block 5 (H). .  The outputs of the bay 28 receive all the outputs of the block 27 reversible meters, as well as the output of the third counter 25.  The operation of bpock 28 begins after the signals about filling of the counters 24 and 25 are received at the control unit 5.  Based on signals from control unit 5, unit 28 sequentially calculates the deviations of the quantization thresholds from nominal values by summing the readings of the corresponding reversible counters of unit 27 and counter 26.  The sign with which the readings of the fourth counter 26 must be taken into account is determined by the number of the reversible counter M recorded in the analyzer 16 of the operating point position and transmitted to the block 28 by the signal from the control block 5.  The summation of the readings of the reversible counters is performed with coefficients that take into account the change in the value of the jump in the amplitude of the signal when moving from segment to segment of the quantization characteristic.  The values of the deviations of the quantization thresholds obtained from block 28 from signals from control block 5 (O) are written to the second memory block 29 connected to the output of block 28.  From the output of the second memory block 29, the values of the deviations of the quantization thresholds for the whole x -.  The quantization characteristics of the signals from control unit 5 (R) are read out and displayed in the form of a table or graph using the aid indicator.  An indication may also be provided of the mixing of the operating point of the quantizer and the deviations of the individual quantization steps from the nominal value.  Thus, the positive effect of introducing the proposed device is to improve the measurement accuracy and reduce the time taken to occupy the channels under the measurements.  The invention The DP device measures the quantization characteristic of a transmitter of signals with pulse-code modulation, containing a regenerator, the first output of which is connected to the first input of the attenuator through the serially connected frequency divider and low pass filter, and the second output of the regenerator through the serially connected code converter, synchronizer The channel number setting unit is connected to the first input of the channel selector, the second input of which is combined with the first synchronizer input, the second input which is connected with the second input of the code converter and with the first input of the frequency depot, the second input of which is connected to the second output of the synchronizer, the code combination separator and indicator, is so that, in order to improve accuracy while reducing the measurement time, a control unit is inserted into it , key, first and second memory blocks, block for calculating deviations by quantizing horns, asymmetry decoding code, segment decoder, operating point position analyzer, three AND elements, four switches, four counters and a reversible counter block, while YOU The frequency divider is sequentially connected to the first element I, the first switch and the first counter connected to the second input of the attenuator, the output of which is connected to the first input of the key, the second input of which is connected to the first output of the control unit, the second output of which is connected to the third input of the synchronizer, the third output of which is connected with the first input of the control unit, the third and fourth outputs of which are connected respectively to the reset input and to the installation input of the first counter, the first and second outputs of the village The channel borer, respectively, through the second and third elements And are connected to the input of the selector code combinations, the first and second outputs of which, respectively, through the second and third counters are connected respectively to the second and fourth inputs of the control unit, the fifth, sixth, seventh and eighth outputs of which are connected respectively second inputs of the second and third elements I, with OBDINED installation inputs of the second and third counters and with the installation input of the block of reversible counters, the signal input of which is one with the third "output code selector combinations, the fourth output of which is connected to The INPUT of the first memory block, the output of which is connected to the inputs of the asymmetry sign decoder and the segment decoder, whose outputs are connected respectively to the third input of the channel selector and to the control input of the first switch, the signal input of which is combined with the first input of the second switch, the output of which is fourth the counter is connected to the first input of the block for calculating deviations of the quantization thresholds, the output of which through the second memory block is connected to the indicator, the fifth and sixth outputs of the code selector combinations are connected respectively to the combined first and combined second inputs of the third and fourth switches, the outputs of which are connected respectively to the second and third inputs of the second switch, the fourth input of which is combined with the installation inputs of the first switch and the first counter, and the second input of the first element And with the reset input of the fourth counters, and the first and second outputs of the block {of the reverse meters are connected to the second input of the deviation calculator, respectively, the threshold in quantization and with the signal input of the working point position analyzer, the output of which is connected to the fourth input of the control unit, whose outputs from the ninth to the thirteenth are connected respectively with the combined third inputs of the third and fourth switches, with the control point of the working point position and with the control inputs of the block for calculating deviations of the quantization thresholds, the second memory block and the indicator. Sources of information taken into account in the examination 1. CCyTT.Sp-Coni.Doc. N9 141 Qewev, 1971 (prototype).