SU1216789A1 - Record-reproducing device - Google Patents

Abstract

The invention relates to magnetic recording and reproducing devices for analog signals and allows for a reduction in noise and intermodulation distortion. For this, a low-pass filter 2 is inserted into the signal processing unit, through inverter 4 connected to one x input of the adder 5, and filter 8 upper. These frequencies are connected via a phase corrector 6 to another input of the adder 5. Regulators 14 set optimal bias currents for recording low-frequency and high-frequency components in the same-name channels. 4 il. .f

Description

one

This invention relates to a magnetic recording technique, in particular, to recording and reproducing analogue signals.

The purpose of the invention is to reduce the level of noise and intermodular distortion.

Figures 1 and 2 show a recording-playback device in recording and reproducing modes separately, in a real device a transition from one mode to another is provided by a multi-contact switch (not shown); in Fig. 3 and Fig. 4, the frequency characteristics of the channels in recording and playback modes.

The device contains a recording amplifier 1, a low pass filter 2, a head 3 for a record-play channel, a low-frequency component, an inverter 4, an adder 5, a phase equalizer 6, a switch 7, a high-pass filter 8, a head 9 for a record-play channel, generator 10 magnetisation, reproduction amplifiers 11 and 12, a terminal amplifier 13, and a bias current regulator 14 in each of the channels.

Elements 2 and 4-8 form a signal processing unit 15.

The device works as follows.

In the recording mode, the signal from the output of the recording amplifier 1 is fed to the inputs of the lowpass filter 2 and to the input of the phase corrector 6. The low frequency components that pass through the phase correction corrector 6 are algebraically summed in the adder 5 with the low frequency components from the low frequency filter 2 output (after inverter 4) and mutually compensate. The high frequency components pass through switch 7, phase corrector 6, adder 5, and are recorded by head 9 on the high frequency subband recording track. The low frequency components that pass the filter 2 record the head 3 on the low frequency recording track; The amplitude-frequency characteristics of the low-frequency and high-frequency channels obtained in the recording mode are shown in FIG.

In playback mode, the signals simultaneously played

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from parallel tracks, heads 3 and 9, after amplifiers II and 12, are supplied to signal processing unit 15. The signal from the output of the filter 2 of the lower 5 frequency is inverted in inverter 4 and fed to the input of the adder 5. The signal from the output of the high-frequency channel after the filter 8 of the upper-frequency is shifted in phase in phase

10 corrector bis corresponding

a phase shift is applied to another input of the adder 5, the output of which provides a flat frequency response of the combined 15 channels, the signal of which is fed to the terminal amplifier 13.

The regulators 14 set the optimal currents of the bias-20

Nor: for recording low-frequency and high-frequency components in the channels of the same name.

Claims (1)

Invention Formula Recording device - playback contains two separated heads connected to the operating mode switch, a bias generator with two bias current controllers, a recording amplifier, two playback amplifiers, a terminal amplifier and a signal processing unit made with a high-pass filter, an inverter and a totalizer differ in 40 45 This is due to the fact that, in order to reduce the noise level and intermodule distortion, the low-pass filter and the phase corrector are inserted into the signal processing unit, the low-pass filter is connected to the same input of the adder via the inverter, and the high-pass filter the equalizer is connected to another input of the adder, while the operating mode switch is configured to connect in the recording mode the output of the recording stack to the input of the low-pass filter and to the input of the equalizer, 5 outputs of the low-pass filter and the output of the adder to the separated heads, and in the mode, playback of the output of the adder to the input of the final amplifier, the input of the lower filter 55 frequencies, to the output of one reproduction amplifier, and the input of the filter of higher frequencies to the output of another reproduction amplifier.