SU397905A1 - DEVICE FOR REPRODUCTION - Google Patents

Description

one

The invention relates to the field of measuring and computing technology and is intended to reproduce the reference and code signals recorded on a magnetic tape track by a multichannel analog magnetograph by modulating the reference sequence of pulses with a serial code group consisting of two adjacent start determinant pulses following the beat and time. bottom pulses following through the clock.

A device for reproducing service information is known, comprising a reproduction amplifier, amplitude selectors, a counter, a decoder, and logic elements. The proposed device differs from the known one in that the selector output is connected to the inputs of the valves and the first matching circuit, the second input of which is connected to the output of the driver, and the output to the single control trigger input, the output of which is connected to the input of the second matching circuit connected to the input also the output of the driver and the output to the counter input, the inputs of the third coincidence circuit are connected to the output of the selector and the first output of the decoder, and the output to the single input of the lock trigger, the output of which en to the input of the fourth coincidence circuit connected to the inputs and with

the first output of the decoder and with the output of the inverter, and the output of the fourth coincidence circuit is connected via the first key to the installation input in the "bullets of the meter, the input of the inverter

connected to the output of the imaging device, and the output to the input of the fifth coincidence circuit, the second input of which is connected to the second output of the decoder, also connected to the digital input of the digital recorder, and the output of the fifth coincidence circuit is connected via the second key to the zero inputs of the blocking, control and trigger triggers trigger register. This allows to simplify the device and increase the noise immunity of the sample code.

Diagram of the device shown in the drawing.

The device contains a magnetic head /,

play replay 2 shaper

3, selector 4, matching circuit 5, trigger

control 6, matching circuit 7, counter 8, decoder 9, matching circuit 10, blocking trigger 11, matching circuit 12, inverter 13, key 14, gates 15, register on triggers 16, matching circuit 17, key 18, digital code 19 outputs , digital recorder 20, the output of the reference signals 21. The device operates as follows. Recorded on one track of the magnetic tape reference frequency and sequential

the code is reproduced by the magnetic head /,

amplified by reproduction amplifier 2 and fed to clock generator 3 and selector 4, which selects pulses of a sequential code, which are recorded by modulating pulses of the reference frequency. The determinant of the beginning of the code group are the two pulses at the output of the selector 4, which follow in tact with the pulses of the reference frequency. The pulses of the code group bits follow after the determinant in even clock cycles, i.e., after one clock pulse. When a clock and code pulse simultaneously arrives at the coincidence circuit 5, control trigger 6 enters state "1" and enables clock pulses (reference frequency) to skip through a coincidence circuit 7 to the input of counter 8, which is connected to the decoder 9. If BTOj is dedicated to the decoder The 9 clock pulse coincides with the code pulse, then the coincidence circuit 10 transfers the blocking trigger 11 to a state that prohibits the 12 clock pulses from the inverter 13 and the second pulses from the decoder 9 from passing through the coincidence circuit. If the indicated pulses of the code determiner do not match, then an inverted (delayed by polktata) clock pulse will pass to the // reset key of the counter in “O”, and the counter 8 will go to its initial state.

Thus, there is a search for a determinant in the sequence of reproducing clock and code pulses. Upon receipt of the determinant to the input of the counter 8, the remaining clock pulses of the code group pass. The gates 15 receive even clock pulses, selected by the decoder, and code pulses from the selector 4. The matching pulses translate the corresponding triggers 16 to the state "1. The triggers 16 are reset to the initial state by the code group's last clock pulse through the matching circuit 17 and the key 18, which also resets the trigger 6 to zero, which prohibits the supply of clock pulses to the counter 5. The last but one clock pulse is also used as a command for reading the parallel code from the outputs 19 to the digital recorder 20. From the output 21, a reference frequency is taken, which is used to control the speed of movement of the magnetic carrier, to compensate for detonation, to obtain time stamps and etc.

The device converts the incoming serial code into a parallel one. The number of bits in the code determines the required capacity of the counter:

V 2n + / e,

where n is the number of bit pulses;

k is the number of pulses required for determining the beginning of the code group and control pulses (/ Jiniii 3).

A synchronous sampling of the code provides increased noise immunity of the device, since the interference can pass through the coincidence circuits only in the tact with a discharge pulse, which is unlikely. The type of clock modulation applied during writing determines the type of selector: amplitude, latitude, phase, etc.

Subject invention

Device for reproducing multi-channel analog signaling

magnetograph containing magnetic head connected to the input of the playback amplifier, the output of which is connected to the inputs of the selector and the former, the counter, the outputs of which are connected to the inputs of the decoder, the outputs of which through the corresponding gates are connected to the inputs of the trigger register, digital regirator register trigger control schemes

matches, keys, inverter and blocking trigger, characterized in that, in order to simplify the device and increase the noise immunity of the code sample, the output of the selector is connected to the inputs of the gates and the first

a coincidence circuit, the second input of which is connected to the output of the generator, and the output is connected to the single input of the control trigger, the output of which is connected to the input of the second assembly scheme connected to the input of the generator, and on the output to the counter input, the inputs of the third coincidence circuit are connected to the output of the selector and the first output of the decoder, and the output with a single input of the lock trigger, the output of which

It is connected to the input of the fourth coincidence circuit connected to the first output of the decoder and to the output of the inverter through the inputs, and the output of the fourth coincidence circuit is connected via the first key to the installation input to

"The counter zero, the inverter input is connected to the driver output, and the output is connected to the input of the fifth coincidence circuit, the second input of which is connected to the second output of the decoder connected to the enable input

the digital recorder, and the output of the fifth coincidence circuit is connected via a second key with zero inputs of the blocking, control, and trigger register triggers.