RU1777178C - Device for multichannel magnetic recording and reproduction of signals with correction of time distortions - Google Patents

Abstract

The invention relates to the accumulation of information and may find application in devices for the accurate magnetic recording of analog signals. The purpose of the invention is to reduce the error of multichannel recording and reproduction of signals by reducing static time distortion. Two reference signals, a high-frequency and a low-frequency, are recorded on the same track together with the information signal. The high-frequency reference signal after playback is extracted by a band-pass filter and multiplied to the frequency required for the operation of the time distortion corrector. The low frequency reference signal shared by the information signal passes a delay line, an analog-to-digital converter, a buffer storage device, a digital-to-analog converter, and then is extracted by a low-pass filter. In the second and each subsequent reproducing channel, the low-frequency reference signal allocated by the low-pass filter is compared in phase with the low-frequency reference signal of the first reproducing channel by means of a phase detector. The output signal of the phase detector carries information on the static time distortion between the information signal of a given channel and the information signal of the first playback channel. Using the output signal of the phase detector in each channel, static time distortions are corrected by changing the delay of the information signal in the buffer storage relative to the information signal of the first playback channel. 2 ill. (L s VI V4 VI vj 00

Description

The invention relates to the accumulation of information, in particular to devices for correcting temporary distortions, and may find application in devices for the accurate magnetic recording of analog signals.

A device for multichannel magnetic recording and reproduction of signals with correction of temporal distortions is known. The device contains, according to the number of information channels, a series-connected information recording head, an information recording amplifier and an information input bus, series-connected reference frequency generator, a first recording amplifier and a first recording head, a second recording head connected through a second recording amplifier to the output of a phase shifter connected to the input with the input of the first recording amplifier The device also contains the number of information channels

a playback head in series, a playback amplifier, a first delay element, an analog-to-digital converter, a memory unit, a digital-to-tax converter, a low-pass filter and an information output bus; according to the number of information channels, a phase detector and a first pulse shaper are connected in series, the second element delays connected by the output to the interconnected synchronizing input of the analog-to-digital converter and the recording input of the memory unit. A memory unit is connected to a playback input to an output of a reference frequency generator. The device also includes a scaling unit, a first playback head connected to the input of the first playback amplifier, a second playback head connected to the input of the second playback amplifier, and a phase detector, a frequency divider and a low-pass filter connected in series between the output of the reference frequency generator and the input of the first recording amplifier, according to the number of channels, a low-pass filter included between the output of the first delay element and the input of the analog-to-digital conversion a converter, a series-connected adder and a controlled generator, a band-pass filter connected between the output of the controlled generator and the input of the first pulse former, a series-connected frequency divider connected to the input to the output of the controlled generator, and a second pulse former connected to the first input of the phase detector connected by the output to the input of the adder connected by another input to the output of the scaling unit connected by the first input to the output of the phase detector. In addition, the device contains a first threshold element, a first one-shot connected to the output of the first playback amplifier by an input through a first threshold element, a first pulse shaper connected by an output to the second inputs of the phase detectors of the information channels and to the first input of the phase detector, the first OR element, the first and the second AND element, the second threshold element, the second one-vibrator, the third and fourth AND elements, the second OR element and the second pulse shaper connected by the output to the second input phase detector and the input through the second element OR to the outputs of the third and fourth elements I. Moreover

the third AND element is connected by the first input to the first input of the first AND element and the output of the frequency divider, the second input. - to the inverting output of the second one-shot. The second one-shot is connected by the output to the first input of the fourth AND element and interconnected by the second inputs of the scaling units and connected by the input to the second input of the fourth AND element directly and through the second threshold element to the output of the second playback amplifier. In this case, the first OR element is connected by the output to the input of the first pulse former 5 s and by the inputs to the outputs of the first and second elements I. The first AND element is connected by the second input to the inverting output of the first one-shot connected to the first input of the second element by the output

0 And, connected by the second input to the output of the first threshold element.

The described device does not provide correction of static temporal distortions (VI) arising between information signals at the output of the device channels due to a change in the delay values of the signals in the delay lines caused by changes in the ambient temperature and aging of the radio elements of the device. In addition, when transferring a magnetic tape with information recorded on it from one device to another, of a similar type, the output of the latter does not provide correction of static VIs arising due to the mismatch of the position of the working gaps of the recording and playback heads, as well as the difference in the values of signal delays in the channels recording and playing back these devices. The device also does not provide correction of static VIs arising from the fact that when the magnetic tape moves relative to the working clearances of the magnetic heads, the tape undergoes transverse distortions and

5 any arbitrary point in time the angle between the working gap of the magnetic head and the edge of the magnetic tape can be arbitrary (other than 90 °, but within the angle 90 ° ± (p, where p is the maximum angle

0 skew magnetic tape relative to the working gap of the magnetic head). Thus, at the initial moment of reproduction, information signals reproduced through various channels are introduced

5 into the buffer storage devices (and, therefore, appear at the outputs of the device channels) with initial phases different from each other and from their initial phases during recording, i.e. On the output devices, there are static VIs between the information signals of various channels and their value can be arbitrary and depends on the position of the magnetic tape relative to the working gap of the magnetic head at the time of recording the information and at the moment of its reproduction.

A time distortion correction device is known which is selected as a prototype. To eliminate inter-channel time distortion, the information and reference signals are recorded together on the same track. The device comprises an information and reference signal reproducing unit, connected via an output through a time-stamping unit to the input of the frequency multiplier and through a first low-pass filter connected in series, a delay line, an analog-to-digital converter, and a buffer storage device to the input of the first digital-to-analog converter, the output of which is connected through a second low-pass filter to the output bus of the device, a second digital-to-analog converter and a generator connected by the output to the first input of the unit Single buffer storage control, a first output connected to the control input of the accumulator buffer.

In addition, the device for correcting the VI includes a first and second pulse counters, a voltage comparator, a single vibrator, a first and second AND element, an OR element, a code sensor, a subtractor and a code adder, and the generator is made with a control input, the frequency multiplier being connected by an input through a voltage comparator to the input of a one-shot, connected by direct and inverse outputs to the first inputs of the first and second AND elements, connected by the outputs to the inputs of the OR element and the second inputs - to the outputs of the frequency multiplier and the generator accordingly, the first pulse counter is connected to the output of the OR element by the first input of the x-clock input of the analog-to-digital converter, and the second input to the second output of the buffer storage control unit connected to the third output by the second input of the second pulse counter connected by the second input and output between the output of the generator and the first input of the control unit of the buffer storage connected to the first and second inputs through the code subtractor to the first input of the code adder connected to the second th input to the output of the encoder, and output via the second digital to analog converter - to the control input of the generator.

The described device has disadvantages. The device is constructed in such a way that when the speed of the magnetic tape is different and information is reproduced from the speed of the tape when it is recorded to exclude the possibility of overfilling or zeroing the buffer storage, the frequency of reading the information signal from the buffer storage is controlled by a generator, the frequency of which depends on the degree of filling of the information storage buffer . Thus, when the playback speed differs from the recording speed, the frequency of the information signal at the output of the device will differ from the frequency of the signal recorded on the magnetic tape. In addition, when multi-channel signal reproduction, the described device does not allow for the correction of static VIs arising due to static distortions of the working clearances of the magnetic heads, differences in the time delays of information signals in the recording and reproduction channels, due to the non-identical phase-frequency characteristics of the channels, and a change in the delay values signals in the delay lines caused by changes in the ambient temperature and aging of the radio elements of the device, static VI, depending on the position of the magnetic tape relative to the working gap of the magnetic head at the time of recording information at the time it began to be reproduced, as well as the static VI arising at the outputs of the device when transferring the magnetic tape.

An object of the invention is to reduce the error of multi-channel recording and reproduction of signals by reducing static time distortion.

To achieve this goal, a device for multichannel magnetic recording and reproduction of signals with correction of time distortions, comprising in each reproduction channel an information and reference signal reproducing unit, the output of which is through a series-connected first low-pass filter, a delay line, a first analog-to-digital converter, a buffer the drive and the first digital-to-analog converter is connected to the input of the second low-pass filter, and the second input of the first analog-to-digital the converter is connected to the output of the playback unit through a series-connected OR circuit, the first circuit. And, a frequency multiplier and a time stamp allocation unit, wherein the second input of the first AND circuit is connected to the output of the allocation unit

mon time stamps through a serially connected single-shot and voltage comparator, and the second input of the OR circuit is connected to the second output of the single-shot through the second AND circuit, the output of the OR circuit being connected to the second input of the buffer storage device via a write pulse counter and a buffer storage control unit. In this case, the second input of the write pulse counter is connected to the second output of the buffer storage control unit, and the third output of the buffer storage control unit is connected to the first input of the read pulse counter, as well as containing the code subtractor, code adder, code sensor, second digital-to-analog converter, and information bus output signal, additionally introduced: in each recording channel - a block of recording of reference and information signals, the adder and the input bus of the information signal, as well as common to all The oscillators are stable frequency oscillators, two low-pass filters and two frequency dividers, in each playback channel there is a band-pass filter connected between the output of the first digital-to-analog converter and the information signal output bus, in the first playback channel there is a phase shifter and a motor control signal bus in playback mode, in each of the other playback channels has a second analog-to-digital converter, a third low-pass filter and a phase detector, with the first inputs of adders in the channel The input buses are connected to the information signals, the second inputs of all adders are combined and connected through the fourth low-pass filter and the first frequency divider to the output of the stable frequency generator, the third inputs of all adders are combined and connected through the fifth low-pass filter and the second divider frequency to the output of the stable frequency generator, and in the first playback channel, the first input of the code subtractor connected through the second digital-to-analog pre The browser with the engine control signal bus in playback mode is connected to the output of the write pulse counter, and the second input of the code reader is connected to the second input of the buffer storage control unit and to the output of the read pulse counter, the input of which in all playback channels is connected to the second input of the second AND circuit and with the output of a stable frequency generator, while the output of the second low-pass filter through a phase shifter is connected to the first inputs of the phase detectors of the second and subsequent playback channels the information, the second inputs of which are connected to the outputs of the second low-pass filters of the corresponding playback channels, the output of the phase detector in the second and subsequent playback channels through a series-connected third low-pass filter, a second analog-to-digital converter, a code adder, to the second input of which a code sensor is connected , and a code subtracter whose second input is connected

with the output of the read pulse counter, it is connected to the second input of the buffer storage control unit.

A device for magnetic recording-reproduction, in which both

on the sides of the recording track of the information signal, two-frequency reference signals are recorded, the low-frequency components of which, after being reproduced from the magnetic tape, are compared in phase to

a phase detector, the output signal of which corrects the operating point of another phase detector that compares the phases of the high-frequency reference signals. In addition, a buffer memory unit

in one of the playback channels, the device is connected to the output bus of a control signal providing speed control of the driving motor in the playback mode.

However, this device does not provide correction of static VIs between information signals of different channels.

A device for reproducing a magnetic recording with time distortion correction is known, in which a reference signal is extracted by means of a filter from the output of the digital-analog converter.

However, when using this device for multichannel reproduction of information, the correction of static VIs between information signals of different channels is not provided.

A device for multichannel recording and reproduction of signals is known in which one of the reproduced reference signals passes through a phase shifter shifting the phase of the signal by 90 ° with respect to the phase of the second reproduced reference signal.

However, this device does not provide correction of static VI between information signals at the output of various channels of the device

In the proposed device, in order to reduce the error of multichannel recording and reproduction of signals, the correction of static VIs between information signals of different channels is carried out as follows.

Two reference signals are recorded on a magnetic tape in each channel together with an information signal, the frequency of one of them being higher than the upper cutoff frequency of the spectrum of the information signal, and the frequency of the second, low frequency, lower than the lower cutoff frequency of the spectrum of the information signal. Both reference signals are generated by dividing the frequency from the signal of the stable frequency generator.

In each playback channel, a high-frequency reference signal is extracted by a time-stamping unit and pulses of information are generated from it into a buffer storage, and a low-frequency reference signal, together with an information signal, passes through the first low-pass filter, delay line, analog-to-digital converter, buffer storage, digital-to-analog the converter also enters the input of the second low-pass filter, which extracts only the low-frequency reference signal from the total signal.

In the second and each subsequent playback channels, the low-frequency reference signal is fed to the second input of the phase detector, the first input of which receives a 180 ° phase-shifted low-frequency reference signal from the first playback channel. Since the reference signals are recorded together with the information signals, a signal proportional to the phase shift (static VI) between the information signal of this channel and the information signal of the first channel is generated at the output of the phase detector of the second and all subsequent channels.

The third low-pass filter extracts a constant component of the voltage proportional to the static VI, and a second analog-to-digital converter converts the value of this constant component into a digital code, which is fed to the first input of the code adder, the second input of which is connected to the output of the code sensor.

At the initial moment of time, the buffer storage control unit sets the counters of the write and read pulses to the initial state, while the write and read addresses generated by

counters are set in such a way that they are spaced in the address space of the buffer storage by half its memory capacity. The counter of 5 read pulses is connected to the buffer storage control unit through a code subtracter, the first input of which receives a digital code proportional to the static shift of the information signal 10 of this channel relative to the signal of the first channel, depending on which the starting address of the read from the buffer storage will change , and, consequently, the delay value of the information signal in the buffer storage. Thus, when setting up the device, the elimination of static VIs between information signals is performed by changing the sensor output code

0 codes in the second and each subsequent playback channel, thereby changing the initial read addresses from the buffer storage, and hence the signal delay values in the buffer

5 drives x. Subsequently, the correction of static VIs arising for any reason is performed automatically. Suppose, for some reason, the delay in some playback channel of the device changes, therefore, the signal at the output of the phase detector changes, as well as the digital code at the outputs of the adder and code reader and, therefore, the start address of the readout changes, which will lead to a change in the delay of the information signal in the buffer storage, which compensates for the initial change in the delay in the channel. In addition, in the proposed device

0 to exclude the possibility of zeroing or overflowing the buffer drive in case of inequality in the playback speed and recording speed in the first playback channel of the write and read addresses

5 are fed to the inputs of the code subtracter, at the output of which a signal is generated proportional to the level of filling of the buffer storage. This signal, after being converted to analog form in a second digital-to-analog converter, is fed to the drive control bus in the playback mode.

Therefore, the proposed device has useful properties, not

5 coinciding with the properties of known solutions, and the proposed solution has significant differences.

Figure 1 shows the structural diagram of the proposed device; figure 2 - the relative position of the reference signals in the frequency domain.

A device for multichannel magnetic recording and reproduction of signals with correction of time distortions contains in each reproduction channel an information and reference signal reproducing unit 1, the output of which is through a series-connected first low-pass filter 2, a delay line 3, and the first analog-to-digital converter 4. buffer drive 5 and the first digital-to-analog converter 6 is connected to the input of the second low-pass filter 7, and the second input of the first analog-to-digital converter A is connected with the output of the playback unit 1 through a series-connected circuit OR 8, the first circuit And 9, the frequency multiplier 10 m block selection of time stamps 11, while the second input of the first circuit And 9 is connected to the output of the block selection of time stamps 11 through sequentially connected single-vibrator 12 and a voltage comparator 13, and the second input of the OR circuit 8 is connected to the second output of the one-shot 12 through the second circuit And 14. The output of the OR circuit 8 is connected to the second input of the buffer storage 5 through the write pulse counter 15 and the buffer control unit 16 5, while the second input of the write counter 15 is connected to the second output of the control unit 16 by the buffer storage 5, and the third output of the control unit 16 by the buffer store 5 is connected to the first input of the read pulse counter 17.

In each recording channel, the device comprises a block for recording information and reference signals 23, an adder 24, an input bus for the information signal 25, as well as a stable frequency generator 26, third 27 and fourth 28 low-pass filters and first 29 and second 30 frequency dividers common to all channels . At the same time, input bus signals 25 are connected to the inputs of the recording blocks 23 through the adders 24, the second inputs of all the adders 24 are combined and connected through the third low-pass filter 27 and the first frequency divider 29 connected to the output of the stable frequency generator 26, and the third inputs of all the adders 24 are also combined and connected via series-connected fourth low-frequency fixture 28 and second frequency divider 30 to the output of stable frequency generator 26.

In the first playback channel, the first input of the code subtractor 18 is connected through a second digital-to-analog

a converter 21 with a motor control signal bus in the playback mode 33, connected to the output of the write pulse counter 15, and the second input of the code reader 18 is connected to the second input of the control unit 16 by the buffer storage bis by the output of the read pulse counter 17, the input of which is connected to the playback channels in all channels the second input of the second circuit And 14 and with the output of the stable frequency generator 26. The output of the second low-pass filter 7 through the phase shifter 32 is connected to the first inputs of the phase detectors 36 of the second and

5 subsequent playback channels, the second inputs of which are connected to the outputs of the second low-pass filters 7 of the respective playback channels. Moreover, the output of the phase detector 36 in the second and subsequent playback channels through sequentially connected to the fifth low-pass filter 35, the second analog-to-digital Converter 34, the adder codes 19, to the second input of which

5, a code sensor 20 is connected, and a code subtractor 18, the second input of which is connected to the output of the read pulse counter 17, is connected to the second input of the control unit 16 of the buffer storage 5. In addition to

0, in each playback channel between the output of the first digital-to-analog converter 6 and the output bus of the information signal 22, a band-pass filter 31 is turned on,

5 The device operates as follows.

In order to increase the accuracy of the correction of the VI on a magnetic tape, two reference signals are recorded in each channel of the device together with an information signal (IC). The frequency of the first reference signal (OS 1) fi is less than the lower frequency of the information signal fen, but above the lower cutoff frequency of the channel bandwidth

5 tk recording-playback (see Fig. 2). The frequency of the second reference signal (OS 2) fa is higher than the upper frequency of the information signal fce, but lower than the upper cut-off frequency of the bandwidth of the playback channel T0 of the playback recording. OC1 and OC2 are formed by dividing the frequency of the stable frequency generator 26 in the first 29 and second 30 frequency dividers to fi and fa, respectively. Third 27 and fourth

5 28 low-pass filters - form harmonic signals OS1 and OS2 by extracting their primary harmonics from pulse signals with frequencies fi and f2. Then OS1 and OS2 enter all the recording channels, in each of which they are mixed by the adder 24 with the IC coming from the input bus of the IC 25, and with the help of the recording unit 23 the biased signal is recorded on the magnetic tape.

When playing in each playback channel, the mixed signal from the reproducing unit 1 enters the time stamping unit 11 and the first low-pass filter 2, which extracts the mixed signal ОС1 and IC from the reproduced mixed signal. From the output of the first low-pass filter 2, these signals enter the delay line 3, equalizing the travel time of the IC and OS2 to the inputs of the first analog-to-digital converter 4, which increases the efficiency of the correction of the VI. The conversion of signals (IC and OS1) in the first analog-to-digital converter 4 into a digital code and writing this code to the buffer storage 5 is carried out with the frequency faan 3fco. The signal with the frequency f3an is generated from the extracted time signal from the mixed signal block 11 OS2 and multiplied a frequency multiplier 10, the multiplication coefficient of which is equal to the division coefficient of the second frequency divider 30. As long as the amplitude OS2 at the input of the voltage comparator 13 exceeds a certain threshold level, an impulse is formed at its output The ice starts the one-shot 12. At the first output of the one-shot with restart 12, a positive potential is formed that allows the pulses to pass through the first circuit And 9. If there is a deep parasitic amplitude modulation or other reasons for which the amplitude of OS2 at the input of the comparator 13 drops below the threshold level , at the first output of the one-shot with a restart 12, a zero potential is formed, which prohibits the passage of pulses generated from OS2 through the first circuit And 9. At the same time, at the second output of one bratora 12 is formed a positive potential, allowing the passage of pulses from the output stable frequency generator 26 through the second AND circuit 14.

Thus, in the case of deep parasitic amplitude modulation or loss of OS2, the operation of the analog-to-digital converter 4 and the buffer drive 5 in the recording mode is not violated, since the missing OS2 is replaced by a pulse signal from the output of the stable frequency generator 26, while the IC is transmitted by device output, however, no VI correction is performed.

The digital code reading from the buffer storage 5 is carried out with a stable gate frequency. generated by the stable oscillator is often 26. The digital code is converted into an analog form on the threshold of the digital-to-analog converter 6. After which the IC is separated by a band-pass filter 31 and fed to the output bus 22. Since the write signal 10 (f3an) The buffer storage 5 is formed from OS2 subject to the same VI as the OS, and the reading from the buffer storage 5 is carried out by a signal of a stable frequency tscht. equal to the average 15 value of the frequency faan, then the IC with the output bus 22 is supplied with significantly lower VI. than in reproducible IP. The control unit 16 of the buffer storage 5 performs the initial installation

20 counters of write pulses 15 and read 17 so that the distance between the cell of the buffer storage 5 into which the recording is made and the cell from which the read is made is

5 half the capacity of the buffer storage. In addition, the control unit 16 switches the buffer memory 5 from the write mode to the read mode, and vice versa, performs address switching

0 write and read, generated respectively by the pulse counters of write 15 and read 17.

To eliminate the possibility of overflow or zeroing of the buffer accumulator 5 l 5 due to the discrepancy between the playback speed and the recording speed in the first playback channel, the code reader 18 compares the read write addresses from the counters of the write pulses 15 and read 17.

From the output of the code subtractor 18, a digital code proportional to the difference between the write and read addresses and carrying information about the degree of filling of the buffer accumulator 5 of the power supply 5 is converted into analog form by the second digital-to-analog converter 21 and fed to the motor control output bus in the playback mode 33, which ensures maintenance

0 average playback speed equal to average recording speed.

Static VI correction is performed using OS1, which is highlighted second in each playback channel

5 by a low-pass filter 7. In the second and all subsequent1 playback channels on the phase detector 36, the phases OS1 of this channel and OS1 of the first playback channel are compared. Moreover, OS1 in the first playback channel passes through a phase shifter 32 shifting the phase of OS1 by 180 °, which is necessary for setting the operating point of the phase detector 36 in the middle of its operating characteristics.

The output signal of the phase detector 36 is fed to the fifth low-pass filter 35, the output of which forms a constant voltage proportional to the phase difference OS1 of this channel and OS1 of the first playback channel, and therefore proportional to the value of the static skew between the information signal of this channel and the information - the signal of the first playback channel. This voltage is converted by the second analog-to-digital converter 34 into a digital code, which, summing up in the code adder 19 with the digital code coming from the code sensor 20, is fed to the first input of the code reader 18, the output of which is the address for reading information from the buffer storage 5. Thus, when changing the static shift between the information signals of the channels or when changing the code at the output of the code sensor 20, when setting up the device, the address of the beginning of reading information from the buffer storage changes L 5, and hence the value of the information signal delays therein. The delay value of the information signal in the buffer storage 5 is equal to

N-t

SMIT where N is the number of memory cells between the memory cell with which the recording of information began and the memory cell from which the reading of information began;

Tschit. period of the information read signal from the buffer storage.

When the device is configured in the second and each subsequent playback channels, the static shift between the ICs at the output of this channel and the ICs at the output of the first channel is eliminated by changing the delay of the ICs of this channel in the buffer storage 5 with respect to the ICs at the output of the first playback channel. The delay is changed by changing the digital code at the output of the code sensor 20. Thus, the elimination of static VIs during the operation of the device is provided automatically, regardless of the reasons that caused them.

For example, if for some reason a static shift occurs between the IPs of the first channel and the IPs of one of the channels, the pulse duty cycle changes

at the output of the phase detector 36 and the voltage at the output of the fifth low-pass filter 35 of this channel, which will lead to a change in the digital code at the output of the second

analog-to-digital converter 34, code adder 19 and, consequently, to a change in the read address at the output of the code subtractor 18. In this case, the delay value of the IC in the buffer storage 5 will change, which will eliminate the static shift that has occurred.

The reproduction unit 1 comprises a reproducing magnetic head and a reproduction amplifier made on

an operational amplifier (op amp) of type K1407UD1, low-pass filters 2, 9, 27, 28 and 36 are approximated by Chebyshev polynomials and performed on an op amp of type K1407UD1. Delay line 3 is made on a 528BR1 discrete-analog delay line chip, analog-to-digital converters 4 and 34 are made on K1113PA1 analog-to-digital converters chips, buffer drive 5 is on operational

memory devices K132RU5, digital-to-analog converters 6 and 21 - on integrated circuits of digital-to-analog converters K1108PA1. Schemes I 9 and 14 and the OR 8 circuit are made on the K155LAZ microcircuit, the one-shot 12 - on the K155AGZ integrated one-shot microcircuit. Frequency multiplier 10 is made according to the phase-locked loop scheme on an op-amp of type K1407UD1 and microcircuits

K155PGZi 155LAZ, voltage comparator 13 - on the integrated comparator chip K554САЗ.

Counters of write pulses 15 and read 17, as well as frequency dividers 29 and 30

made on K155IE7 integrated counters, code subtractor 18 and code adder 19 - on complete four-bit totalizers K155IMZ microchips, code sensor 20 - on a ППХ type switch. Block

control 16 of the buffer drive 5 is made on integrated circuits K155LAZ. K155AG1, K155TM2, K155MAZ according to the functional diagram shown in figure 2 in the description of the prototype device.

0 Time stamping unit 11 is a band-pass filter approximated as a Chebyshev polynomial, and is implemented on an op amp of type K1407UD1 according to the active RC-filter circuit, a band-pass filter 31

5 is made similarly.

Phase detector 36 is made according to the scheme of the RS-trigger on the chip K155LAZ. The recording unit 23 comprises a recording head and a recording amplifier made on an op-amp of type

K1407UD1, adder 25 is made on an op-amp of type K1407UD1.

Recording on a magnetic tape together with the information signal of two reference signals makes it possible to reduce the static VI between the information signals at the output of the device and, therefore, to reduce the error of multichannel recording and playback compared to similar devices by 2 ... 3 times.

Claims (1)

SUMMARY OF THE INVENTION A device for multi-channel magnetic recording and reproduction of signals with correction of time distortions, comprising in each reproduction channel a series of information and reference signal reproducing unit, a first low-pass filter, a delay line, an analog-to-digital converter, a buffer storage device, a first digital-to-analog converter and a second low-pass filter connected in series between the output of the playback unit and the other input of the analog-to-digital pre a time stamping unit, a voltage comparator, a single vibrator, a first AND element and an OR element connected between the output of the time stamping unit and another input of the first element AND a frequency multiplier connected between the other output of the one-shot and the second input of the element OR the second element AND, counter write pulses and a read pulse counter, a buffer storage control unit connected by three outputs to write and read pulse counters and with another input of the buffer storage, and the first input ohm - with the output of the write pulse counter, a common stable frequency generator for all channels, the output of which is connected to the input of the read pulse counter and the second input of the second element And each of the playback channels, a code subtractor included in the first channel between the outputs of the write and read pulse counts, moreover, the output of the read pulse counter is connected to the second input of the control unit of the buffer storage device, and in the remaining playback channels, by the input with the output of the read pulse counter, in all, cr the first channels, the reproduction channels are connected in series by a code sensor 5 and a code adder and a second analog-to-digital converter, in the first product channel there is a second digital-to-analog converter and an information signal output bus, characterized in that in order to reduce the errors of multi-channel recording and playback signals due to the reduction of static temporal distortions, the first frequency divider and 15 connected to the output of the stable frequency generator are additionally introduced into it a third low-pass filter connected in series to the output of the stable frequency generator, a second frequency divider and 0 a fourth low-pass filter, in each recording channel, an adder and a unit for recording information and reference signals connected in series with the input information bus, the second and third the adder inputs are connected to the outputs of the third and fourth low frequencies, respectively, in the playback channels there is a band-pass filter connected between the output of the first digital-to-analog converter and the output information signal bus, in the first playback channel there is a phase shifter connected by an input to the output of the second low-pass filter, the input of the second digital-to-analog 5 converter is connected to the output of the code subtractor, and the output is connected to the engine control signal bus in the playback mode, in other playback channels - 0 sequentially connected between the output of the phase shifter of the first playback channel and the input of the second analog-to-digital converter, a phase detector and a fifth low-pass filter, the second input d of the phase detector 5 is connected to the output of the second lowpass filter, the output of the second analog-to-digital converter - a second input of the adder codes, the output of which is connected to the second input of the subtractor codes 0 You are a connected with the control unit swing buffer accumulator. Channel 1 Zoslroizbede and 3 Sli)  fen 1 - bandwidth of the recording-reproducing channel; 2- frequency band of the information signal. Fig.) 7 7 fcf.fiftt f