SU1700597A1 - Method of magnetic recording and reproduction of signals and device to implement it - Google Patents

Abstract

The invention relates to the accumulation of information and makes it possible to increase the Hp volume of the recorded information. Two channels of binary signals are recorded on one track of the recording medium using three frequencies - from generators 6, 7 and 15 switched by switches 3, 4, 13 and 1 and after that recorded from the output of the first element OR 1. During playback, the three-frequency signal section Band-pass filters 17, 20, and 23 per component are demodulated by detectors 18, 21, and 2k and low-pass filters 19, 22, and 25. The reproduced signals of both channels are formed by the first trigger 9, the third element OR 12 and the second trigger 16, respectively. 1 Cp. Files, 1 ill. i t t sh w t t v w sh w. ate with i

Description

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The invention relates to the accumulation of information.

The aim of the invention is to improve the accuracy of recording and reproducing by eliminating the loss of jets in transient modes of operation of the device.

The drawing shows a block diagram of a device for magnetic recording and reproduction of information that implements the proposed method.

The device for magnetic recording and reproduction of signals contains the first element OR 1 connected by an output to the input of the recording-reproducing path 2, inputs to the outputs of the first 3 and second switches connected by control inputs to the output of the information control element 5. It also contains the first signal generator b connected to the output of the switch 3, the second signal generator 7, the frequency divider 8 and the first trigger 9 connected to the output bus 10 of one information channel, the second 11 and the third 12 elements OR, the third 13 and the fourth k switch third signal generator 15, second trigger 16, the first band-pass Filter 17, the first detector 18 and the first low-pass filter 19, the second secondary band-pass filter 20, the detector 21 and the low-pass filter 22 and the serial the third band-pass filter 23, the 2k detector and the 25 low-pass filter.

The recording-playback path 2 comprises a first switch 26 connected in series, a universal magnetic head 27 s amplifier 28 and a second switch 29. At the same time, the OR 11 element is connected to the input of switch b, and the inputs to the outputs of switches 13 and 1 connected to the generator outputs 7 and 15 signals and connected by control inputs through a frequency divider 8 with a control input of the second switch k. Path 2 of the playback recording is connected by an output to the inputs of bandpass filters 17, 20 and 23, trigger 9 is connected by inputs to interconnected outputs of filters 19 and 22 of the lower hours.

The element OR 12 is connected to the output of the first input of a trigger 16 connected by a second input to the output of the low-pass filter 25 and the output to the output bus 30 of another channel.

The device for magnetic recording and reproducing signals operates as follows.

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To record two channels on the same track of a magnetic medium, the recording is performed by three different frequencies, generated by the signal generators 6, 7, and 15. Signals from the outputs of the information control element 5 alternately to the inputs of the element OR 1, the signals from the signal generator 6 are switched and from the OR 11f element to the inputs of which the signals from the signal generators 7 and 15 are alternately switched by switches 13 and 1 under the influence of the signals from the frequency divider 8 outputs by four. At its input CMI is received from the control input of the switch k. The signal from the output of the element OR 1, the pass-through path 2 of the recording-reproduction, is selected in frequency by band-pass filters 17, 20 and 23, the output signals of which are subjected to demodulation by detectors 18, 21 and 2 and filters 19, 22 and 25 of the lower frequencies. The output signals of the lowpass filters 19 and 22 control the operation of the flip-flop 9 directly, and one of the inputs of the second flip-flop 16 through the third element OR 12. The signal from the output of the low-pass filter 25 controls the operation of the flip-flop 16 directly at its second input.

Claims (2)

1. A method of magnetic recording and reproducing signals, comprising generating a recording signal by filling the period of an input rectangular signal with signals of a harmonic carrier of the first and second frequencies and demodulating them during reproduction, in order to improve the recording and reproduction accuracy by eliminating signal loss in transient modes of operation of the device, an additional square is formed from the input rectangular signal of the first channel by dividing by the pulse frequency the second channel's signal, within the pulse of which, the pulses of the input rectangular signal of the first channel are filled with a harmonic 1 signal of an additional third frequency, and during reproduction after demodulation, they remember (the state of the pulse or pause of the received rectangular signal for a period of time) until the frequency change of the harmonic carrier. 2. A device for magnetic recording and reproduction of signals, containing the first OR element connected by an output to the input of a recording-playback path, inputs to the outputs of the first and second switches connected by control inputs to the output of an information control element, the first signal generator connected to the output the first switch input, the second signal generator, the frequency divider and the first trigger connected by the output to the output bus of one information channel, characterized in that, in order to improve the recording accuracy and vrsproizvedeni and by avoiding drop out of signals in transient device operation modes, s 0 0 five It introduced the second and third elements OR, the third and fourth switches, the third signal generator, the second trigger, the first band-pass filter, the first detector and the first low-pass filter, the second band-pass filter, the detector and the low-pass filter and the third band-pass connected in series a filter, a detector and a low-pass filter, while the second element OR is connected by an output to the input of the second switch, and the inputs to the outputs of the third and fourth switch- connected in Wires to the outputs of the second and third signal generators and connected to the control inputs through a frequency divider with the control input of the second switch, the record-play path connected by the output to the inputs of the first, second and third band-pass filters, the first trigger connected to the inputs to interconnected outputs the first and second low-pass filters and the inputs of the third OR element connected by an output to the first input of the second hera connected by a second input to the output of the third low-pass filter and output th - to the output line of the other channel.