SU419956A1 - - Google Patents

Description

one

The invention relates to the field of instrumentation, in particular, to an apparatus for magnetic recording discrete messages on several tracks using signals containing sync pulses and recorded on separate tracks or a magnetic carrier track.

Devices for recording and reproducing electrical signals are known that are designed on the basis of logic elements using amplifiers separately for channels of discrete signals and for a channel of a clock signal. But in such devices, the occurrence of signal extraction of clock pulses reduces the reliability of discrete signals.

In order to increase the reliability of recording dskretnyh signals when the recorded and reproducible signals of clock pulses fall out, the proposed device is additionally equipped with a pulse counter connected between the trigger and the AND amplifier of the playback of clock pulses, while the length of the recording track exceeds the length of the recording track of discrete signals.

The drawing shows the electrical block diagram of the described device.

Switch 1, when the corresponding signals are fed to it, connects one of the heads 2, 3, 4 to the input of the amplifier 5 for reproducing discrete signals, and to the input of the circuit 6 And 6 is fed from 1 signal to turn on the thread. The sync pulses, as they are played from track 7, go through amplifier 8 and the AND 9 circuit to the output of the latter and simultaneously to the input of the pulse counter 10. When recording and playing discrete messages, the pulse counter counts the number of the latter, and when the number of synchro pulses is played in discrete connections, the output of the counter is a signal that translates trigger 11 into

another state. At the same time, the output of the trigger is a signal acting on the AND 9, 12, 13 n circuits on the switch 14 of the motor 15. The latter stops, and the magnetic carrier 16 or also

0 is stopped or reversed, and the outputs of amplifiers 8 and 5 are locked. In this way, the recording or reproduction of false numbers, which are of a random nature, is prevented after the end of the recording or the simulation of discrete signals. If during the recording of sync pulses on any area of the carrier, for example, on section 17, the sync pulses are not recorded, then when writing discrete signals, some of the latter will not be lost in sections 18, 19, 20, since

Track 7 has a number of sync pulses exceeding the number needed to record discrete messages. Instead of recording sections 18, 19, 20 of the carrier free from recording, the corresponding discrete signals will be recorded in sections 21, 22, 23. Synchronization pulses are recorded or replayed by head 24 entering the common head unit 25. Additional amplification is performed by amplifier 26, and switching - scheme “And 27.

Subject invention

A device for recording and reproducing electrical signals containing magnetic media moving past a block of magnetic heads, one of which is connected through its own separate amplifier for reproducing clock pulses to its And circuit, and the others through a serially connected switch and amplifiers for recording and reproducing discrete signals to other iCxeMaM "And, the inputs of the group of which are associated with the point of connection of the outputs of the trigger with the motor phase switch, characterized in that, in order to increase the reliability Recording discrete signals when a recorded and reproducible sync pulses fall out, it is equipped with a pulse counter connected between the trigger and the I And sync pulse reproduction amplifier, the length of the recording track of which exceeds the length of the discrete signal recording track.

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