SU1256093A1 - Device for checking channel for reproducing from magnetic record medium - Google Patents

Abstract

The invention relates to the accumulation of information and allows to increase the point of control of the playback channel. The digital information reproduced by the magnetic head 5 enters through the amplifier 6, the low-pass corrector 7, the high-frequency corrector 8 and the phase corrector 9 to the threshold formers 1 and to the amplifier-limiter 10 forming a rectangular playback signal fed to block 11 phase locked loop. The shaper 12 pulses from the negative differential of each clock pulse generates a short platoon pulse that flips RS triggers 2 to a single state. The output pulses of the threshold drivers 1 reset the RS flip-flops 2 to the zero state. The number of RS flip-flops 2 that are in the zero state is proportional to the maximum level of the playback signal, i.e. the magnitude of this characteristic level determined by the generator of 3 threshold levels. 1 il. with SS (L 15 U slud about UD GO

Description

The invention relates to the accumulation of information, namely, devices for monitoring the playback channel from a magnetic recording medium.

The purpose of the invention is to improve the accuracy of monitoring the playback channel from a magnetic recording medium.

The drawing shows a device for monitoring a playback channel from a magnetic recording medium.

The device contains threshold elements 1, connected by outputs to the first inputs of RS flip-flops 2, connected by first inputs to the outputs of the sensor 3 threshold levels and connected by second inputs to the output of channel 4 from the magnetic recording medium. The channel 4 for playback from the magnetic recording medium is made in the form of connected successively reproducing magnetic head 5, reproduction amplifier 6, low-frequency corrector 7, high-frequency corrector 8 and phase corrector 9, and the threshold threshold adjuster 3 - a voltage divider connected to a source of stabilized voltage.

The device also contains an amplifier-limiter 10 connected in series, a phase locked loop 11 and a pulse shaper 12, the output of which is connected to the second inputs of RS flip-flops 2, and D-flip-flops 13, the latter are connected by information inputs to the direct outputs of RS flip-flops 2 and connected to the direct outputs to the indicator 14, made in the form of a line of LEDs. The output of the playback channel 4 from the magnetic recording carrier is connected to the input of the limiting amplifier 10, and the phase locked loop 11 is connected to the synchronization inputs of the D-flip-flops 13. At the same time, the limiting amplifier 10 is connected to the output bus 15 of the playback signal. I

The control of the playback channel from the magnetic recording medium by means of the device proposed is as follows.

The digital information reproduced from the magnetic recording medium by the reproducing magnetic head 5 is fed through the reproduction amplifier 6, the low pass corrector 7.

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high-pass corrector 8 and phase corrector 9 to threshold drivers 1 and limiting amplifier 10. Low frequency corrector 7, corrector

8 bass and phase corrector

9 perform amplitude-frequency and phase-frequency correction of the reproduction signal. The limiting amplifier 10 generates a rectangular playback signal supplied to the output bus 15 of the playback signal and to the block 11 of the phase locked loop. Block 11 phase-locked loop generates pulses of the sync signal. The shaper 12 pulses from the negative differential of each clock pulse generates a short platoon pulse that flips all RS flip-flops 2 to one state. The output pulses of the threshold drivers 1 reset the RS flip-flops 2 to the zero state. As a result, by the time a positive differential pulse arrives, the next

after the impulse of the platoon, part of the RS flip-flops 2 is in the zero state. The number of RS-flip-flops 2, which are in the zero state of 30 SRI, is proportional to the maximum level of the playback signal, i.e. the magnitude of this characteristic level determined by the generator of 3 threshold levels. By a positive signal pulse clock output, the output information of the RS-flip-flops 2 is overwritten into D-flip-flops 13. The state of the D-flip-flops 13 is indicated by an indicator 14, in which the corresponding LEDs are dimmed.

Claims (1)

Invention Formula A device for monitoring the reproduction channel from a magnetic recording medium, which contains threshold drivers connected to the first inputs of RS flip-flops, connected to the outputs of the threshold level setter and connected to the second inputs of the magnetic recording carrier by the first inputs, and in order to increase the accuracy and control of the playback channel from the magnetic recording medium, D-triggers are inserted into it, connected by information inputs to the direct high .312560934  the RS trigger triggers and the second RS trigger inputs connected, with direct outputs to the indicator, the output channel of the playback channel worn in the form of LEDs, and the magnetic recording switch connected to the amplifier-fire input of the amplifier-limiter, and the retainer unit, the phase auto-loop unit — the phase-locked loop of the frequency control and its driver — are connected to the synchronizing inputs of the pulses, the output of which is connected to the D-flip-flops.