SU399911A1 - DEVICE FOR MAGNETIC RECORDING AND REPRODUCTION - Google Patents

Description

I

The invention relates to instrument engineering and can be used in magnetic recording equipment, where an increased recording density of information on magnetic media is required.

In known magnetic recording apparatuses, where recording and reproduction are carried out using pulse-width modulation of signals, the recording density is not high enough, which is explained by the limited permissible value of temporal distortion, which, in turn, is caused by the mutually superimposed adjacent impulses .

The purpose of the invention is to increase the consistency of recording information on magnetic media.

To do this, in the proposed device, a parallel chain is inserted into the recording channel, one branch of which consists of a series-connected frequency divider and a non-controlled delay block, and the other from a linearly falling voltage generator and a controllable delay block, the television channel is equipped with a T-shaped chain The horizontal line of which consists of a series-connected uncontrollable delay unit and frequency widget, and the vertical line consists of a linearly rising voltage generator and a controllable delay unit.

2

In this case, each block uses its own blocks.

The drawing shows a block diagram of p) of the proposed magnetic recording and reproducing apparatus.

The pulses from the pulse-width modulator 1, when written, enter the differentiating circuit 2. The diode 3 transmits the sync pulses of positive polarity, and the diode 4 - negative. Further, the same pulses fall on the frequency divider 5 and the unmanaged delay unit 6. The pulses from diode 4 arrive at the input of the controllable delay unit 7, to another input of which a signal is fed from the linearly and alternator generator 8, which in turn is started by synchronism), taken from the output of block 6. Sync pulses from blocks 6 and 7 are fed to different inputs of recording amplifier 9 connected to the magnetic recording head 10.

When playing snga.h with magnetism: heads of playback 11 through amplify. 12, limiter 13 and differential.) I1, y10 circuit 14 enters diodes 15 and 16. Negative iolacity clock pulses through diode 15 to block unmanaged delay 17. Delayed the sync pulses trigger the generator of a linearly increasing voltage 18. From its output, the signal is given

one of the inputs of the controllable delay unit 19, and the other input of which receives a positive polarity signal from diode 16. From unit 17, in addition, the signal goes to the multiplier 20 and from it to the trigger circuit 21 ,.

Thus, in the recording channel between the diodes and the amplifier, a parallel circuit is turned on, one branch of which consists of a series-connected frequency divider 5 and an unmanaged delay block 6, and the other branch from a linearly falling voltage generator 8 and a controlled delay block 7. In the same channel, a T-chain is used, the horizontal branch of which consists of a series of uncontrolled delay 17 and a multiplier 20 connected in series, and the vertical branch of series-connected ora Ramp voltage 18 and a controllable delay unit 19.

Subject invention

A magnetic recording and reproducing device comprising, at the channel input

records connected in series by a pulse-width modulator and a differentiating circuit connected to the cathode and anode of different diodes, and the output is an amplifier and a magnetic head, and in series the limiter and another differentiating circuit connected to another pair of diodes and, at the output, a starting circuit, characterized in that, in order to increase the recording density, the recording channel is provided with a parallel chain connected between the diodes and the amplifier, one branch of which consists of a follower About the connected frequency divider and the unmanaged delay unit, and the other one from the series-connected linearly falling voltage generator and the controllable delay unit, the reproduction channel is equipped with a T-shaped circuit connected between the diodes and the starting circuit, the horizontal branch of which consists of the series-connected units uncontrolled delay and frequency multiplier, and vertical from the ramp voltage generator and controllable delay block.

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