SU455364A1 - Multichannel device for magnetic recording and playback of digital information - Google Patents

Description

one

The invention relates to the field of instrumentation and can be used in the apparatus for magnetic recording of digital information, where a slow change in the speed of movement of the magnetic carrier takes place or is expected.

Digital recording and reproducing signals are known that are made with phase handlers, proofreaders, memory readers, phase detectors, and a synchronization unit. In such devices, slow oscillations in the speed of movement of the magnetic carrier, in particular, the magic tape, occur, a decrease in the noise immunity of the device as a whole is observed. Improving noise immunity using known means leads to the complication of the electrical circuit as each channel individually, and the entire device.

The purpose of the invention is to improve the noise immunity of a device for magnetic recording and reproduction of digital information and to simplify its electrical circuit.

This is achieved by the fact that the proposed device is equipped with delay lines in different channels, one of which is connected between the input phase manipulator and the recording-playback unit, and the second between the phase detector and the multiplier connected simultaneously with the trigger input and output

shaper. Trigger outputs and switches to the second inputs of phase detectors.

The drawing shows a block diagram of the described multi-channel device for magic recording and reproducing digital information (two channels).

The first channel consists of phase mapping of the torus /, common block 2 recording-reproducing, equalizer 3, limiter 4. phase detector 5. 6 delays and multiplier 7. The second channel consists of phase knob 8, common block 2 recording-playing, corrector 9 , limiter 10, phase detector // and multiplier} 2.

Parallel to the phase detectors, the siikhroizizacin block 13 is included, consisting of shapers 14 and 15, adder 16, trigger / 7 and output shaper 18. The input signal is set to shafts 19 and 20, and the output signal goes to buses 21 and 22. The synchronization signal arrives wi 2 -3, but leaves the bus 24. In addition, in the second channel it is not immediately immediately behind the phase manipulator 8 that LiP1I delay 25 is used.

On the first channel, the initial information signal follows directly from the phase handler on the zapssi-reproducing unit; on the second channel, the signal is delayed by a delay line by a time equal to half the clock frequency period.

Due to the fact that impulses formed from the fronts of information signals are sent to the adder -16, a uniform sequence of double frequency pulses arriving at the trigger is formed at its output. The signals from the trigger outputs come to the phase detectors, as a result of which the incoming signal is multiplied with the information signal. In addition, a trigger is sent from the trigger to the trick of driver 18, with which the pulses are generated from the fronts of the signals, which are reference oscillations. These pulses are the output snrossy sequence.

Subject and title

A multichannel magneto recorder for reproducing digital information, containing in each channel a serially connected phase handler, a common recording / reproducing unit, an equalizer and a limiter connected simultaneously through a driver to a common adder, a trigger on an output driver, and through a phase detector to a non-multiplier, characterized in that, in order to improve noise immunity and simplify the electrical circuit, it is provided in separate channels with separate delay lines, one of which connected between the phase mannul torus and the recording-playback unit, and the other between the phase detector and the non-multiplier connected simultaneously with the trigger input and the output driver, while the outputs of the trigger are connected to the second inputs of the phase detectors.