SU415704A1 - - Google Patents

Description

one

The invention relates to the field of instrumentation.

Multichannel ycipoiicTBa for recording are known, in which recording is made by a transportable device and playback is stationary. But since it is almost impossible to align the working gaps of the magnesium heads of recording and playback devices, a constant component appears on the output that reduces the reliability of the recorded or reproduced signal.

To reduce the likelihood of a constant component occurring at the output of the device, the proposed device is equipped with three iggero.m and resistive dividers, switched on, between the shape of the reference drivers and the points of connection of the demodulators with filters.

The drawing shows an electrical block circuit of the described multi-channel device consisting of series-connected oscillator 1 reference pulses, phase modulators 2 and recording head 5. On the playback side after the magnetic head 4, playback amplifiers 5 are installed, the formers 5 and 7 of the reference IM pulses, the 8 signals i-pulses, demodulators 9 and filters 10. In

device entered trigger // and resistive dividers 12.

Rectangular pulses come from generator 1 to the two extreme tracks.

heads 3. But at the same time, the same pulses go to the input of phase modulators, to the other inputs of which a recorded useful signal is received. Each of the phase modulators shifts the phase of the pulses relative to the recorded signal by an amount directly proportional to it. In the process of reproduction, due to some discrepancy between the working gaps of the magnetic heads by the angle of tilt (skew), the pulses are shifted one relative to the other for a certain period of time.

As a result, a constant component arises at the output.

Introduction to the trigger scheme with dividers significantly reduces the probability of the occurrence of a constant component and in some cases can make its presence almost imperceptible.

Subject invention

A multi-channel magnetic recording-reproducing device containing magnetic magnetic heads of the same name, the first of which is connected to a series-connected phase modulators and a generator of reference impulses, and the second is, in turn, including “M | M amplifiers,” signal pulses, demodulators and filters, characterized in that, in order to reduce the likelihood of a component of the device, the output device is equipped with a trigger, the inputs of which are connected to the driver pulses, and resistive dividers mounted between the output of the flip-flop inputs and filters.

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