SU1394235A1 - Analog signal magnetic recorder - Google Patents

Abstract

This invention relates to recording mag. The purpose of the invention is to improve the recording quality. When a pause occurs in the recorded analog signal, the constant voltage at the input of trigger 6 decreases and it overturns. Through its opened output stage, the constant voltage enters the input of the integrator 7, the capacitor of which gradually begins to charge. As it charges, the resistance of the emitter decreases - the collector of the regulating element 8 ,, At the end of the pause at the output of the rectifier 5, a constant voltage appears; the trigger 6 returns to the initial state; the capacitor of the integrator 7 discharges and portion collector resistance - increases emitter input resistance of the rectifier 9 is increased, the high frequency bias current in the recording head 2 is reduced ,, and recording an analog signal can continue to obtain the optimum recording characteristics yl about 1 to cl

Description

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refers to a magnetic recording in the recording

eni - increase by reducing the pauses of the recorded 10

structured device is shown

gains an amplifier 1 connected to a goy through a sequence of 15 amplifier 3 voltages up but he re on what it is

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The regulator 4, the rectifier 5, the Schmitt trigger 6, the integrator 7, the regulating element 8 to the input of the two-half-period rectifier 9, the output of which is connected to the recording head 2 and to the first input of the erasing and biasing generator 10, the second input of the connected with the erase head 11, as well as the input bus connected to the input of the 1 record amplifier

In this case, the regulating element 8 is designed as a transistor, the base of which is connected to the output of the integrator 7, the emitter is connected to the common bus, and the collector is connected to the input of the rectifier 9

The device works as follows

When passing in front of the erasable magnetic head 1, the magnetic recording medium is exposed to a demagnetizing high-frequency field created by the erasing magnetic head 11 The analog signal to be recorded is fed to the input of the recording amplifier 1 After the required amplification and frequency correction in the amplifier, the analog signal is applied to the recording; - a head 2 which records it on a magnetic recording medium. To increase the sensitivity of the recording process, reduce nonlinear distortions and broaden the dynamic range, a high-frequency biasing signal from the 10-current erase generator and biasing is supplied to the recording head 2. Simultaneously, the recorded analog signal from the output of the write amplifier 1 is fed to an additional amplifier on the voltage amplifier 3 with the regulator 4 connected to the output

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level, and from it to the rectifier 5 The rectified direct voltage controls the operation of the trigger 6 When a pause occurs in the recorded analog signal, the constant voltage at the input of the trigger 6 decreases and it overturns Through this opened output stage, the constant 6 the voltage to the input of the integrator 7, whose capacitor begins to gradually charge. As it charges, the resistance of the emitter-collector section of the regulating element 8 decreases.

At the end of the pause, a constant voltage appears at the output of the rectifier 5 in the recorded analog signal, the trigger 6 returns to the initial state, the integrator capacitor 7 is discharged to the input resistance of the regulating element 8 and the resistance of its collector-emitter section increases As a result The input resistance of the rectifier 9 increases, the high-frequency bias current in the recording head 2 is restored (smoothly, with a low slew rate and symmetrically for both half-waves) to initial optimal value and the analog signal recording can continue to produce optimal recording characteristics

Since the change in termination and recovery, respectively, when the pauses in the recorded signal of the high-frequency bias current in the recording head 2 are completed and not produced in the recording head 2 is not jump-like, but smoothly and symmetrically for both half-waves, the parasitic magnetization of the core of the recording head 2 does not occur in the device, and hence the noise of the recording medium does not increase, and also there is no abrupt change in the noise in the pauses, which makes the process noiseless without interfering with the action during the subsequent m playing. ,

The trigger threshold can be changed to the desired value by the level 4 controller. This makes it possible to record analog signals of different dynamic range.

Fo: rmula invention

A device for magnetic recording of an analog signal, comprising a recording magnetic head connected to the output of the recording amplifier and the first output of an erase current generator and a submagnet, a voltage amplifier and a rectifier, an input bus connected to the input of the amplifier, recordings, characterized in that Regarding the recording quality by reducing the level of interference in the pauses of the recorded signal, a magnetic erase head is inserted into it, in series

Schmitt trigger, an integrator, a regulating element, and a two-half-period rectifier whose input is connected to the first output of the erase and biasing generator, and an output to the output of the regulating element, the erase head connected to the second output of the erase and biasing generator, and also A level torus connected between the voltage amplifier and the rectifier, the output of which is connected to the input of the Pytta trigger, the output of the power amplifier is connected to the input of the voltage amplifier about

Claims (1)

SUMMARY OF THE INVENTION A device for magnetic recording of an analog signal, comprising a magnetic recording head connected to the output of the recording amplifier and the first output of the erase and bias current generator, a voltage amplifier and a rectifier, an input bus connected to the input of the amplifier. recording, characterized in that, in order to improve the recording quality by reducing the noise level in the pauses of the recorded signal, a magnetic erase head jg is inserted into it, Schmitt trigger is connected in series, an integrator, a control element, as well as a half-wave rectifier, an input which is connected to the first output of the erase and bias generator, and the output to the output of the regulating element, the erase head connected to the second output of the erase and bias generator, as well as a level control Between the voltage amplifier and the rectifier, the output of which is connected to the input of the Schmitt trigger, the output of the recording amplifier is connected to the input of the voltage amplifier.