SU503279A1 - Device for reproducing multi-track waveforms - Google Patents

Description

(54) DEVICE FOR PLAYING A MULTI-BOWY SIGNAL GRILLM

one

This invention relates to a magnetic recording technique.

A device for reproducing a multi-track waveform is known, comprising delay blocks, a middle and two groups of extreme channels, each of which includes a reproducing circuit, a correction circuit, and a limiter with a demodulator, placed respectively in the middle or extreme parts of the common block. , to the two inputs of which the clock pulse generator is connected, and to the output - a chain of three triggers connected in such a way that the first input of each subsequent trigger with vat previous output, wherein the second inputs of third flip-flops coupled to the second input of the first flip-flop secondary channel.

The prior art device makes it possible to compensate for phase shifts between reproduced signals, however, in a number of cases the compensation range is insufficient.

In order to extend the range of compensation of phase shifts between reproduced signals, in the proposed device, static phase shift compensation blocks are inserted in each channel, connected between

the output of the clock pulse and the second input of the first trigger, and, in addition, the second input of each of the second triggers of all channels, except the two extreme, connected to the output of the delay unit of the corresponding channel, the second inputs of the second trigger of the extreme channels are connected to the same inputs of the second triggers of adjacent channels and the input of each of the delay blocks is connected to the second input of the first trigger of the corresponding channel.

The drawing shows a variant of the described device, containing the middle channel 1 and channels 2-5. Channels 2 and 3 form one extreme group, and channels 4 and 5 form the second extreme group of channels. In actual equipment, the number of channels included in each group may be different. Each channel contains a magnetic head 6 placed in a common block 7, a playback amplifier 8, a correction circuit 9, a limiter 10, a demodulator 11, a driver of 12 clock pulses, a block 13 for compensating static phase shifts and triggers 14-16. All channels, except for the extreme channels 3 and 5, contain blocks of 17 delays with a delay time of half a clock period. Each channel ends with an output of 18

reproduced information. The first inputs of the triggers in the drawing are marked with the number 19, and the second - with the number 20.

The device works as follows. The signal reproduced by the magnetic head 6 enters the reproduction amplifier 8. The amplified signal is corrected in amplitude and phase by the correction circuit 9 and enters the limiter 10, from the output of which enters the demodulator AND and the driver of 12 clock pulses. Shapers

12 provide the selection of the reproduced signal clock pulses. Static phase shifts between clock pulses of individual channels are compensated for in blocks 13, for example, by introducing a signal delay. From the output of the block

The 13-stroke pulses are fed to the input 20 of the trigger 14, to the input 19 of which the information signal is received from the demodulator 11. Thus, the output of the trigger 14 is a signal in which the static component of the phase shift is compensated. The output signal of the trigger 14 is fed to the trigger 15, the information is recorded in which is carried out by the signals of block 13, delayed by half of the clock period in the block 17 of the delay, and further on the trigger 16. The connection of the second inputs 20 of the trigger 16 to the same clock source and the second inputs of 20 triggers 15 with delay blocks 17 provides compensation for dynamic phase shifts, as well as the output of information to the outputs 18.

Claims (1)

Invention Formula A device for reproducing a multi-track waveform containing delay blocks, middle and two extreme channels, each of which includes a magnetic reproduction head placed, respectively, in the middle or extreme parts of the common block, connected through an amplifier 0, a correction circuit and a limiter with a demodulator, to the two inputs of which a clock driver is connected, and to the output is a chain of three triggers connected so that the first input 5 of each subsequent trigger is associated with the output of the previous one, the second inputs of the third triggers are associated with the second input of the first middle channel trigger, characterized in that, in order to extend the compensation range of phase shifts between the reproduced signals, each channel has static phase shift shifts inserted included between the clock clock and the second 5 input of the first trigger, and, in addition, the second input of each of the second triggers of all channels, except the two extreme, is connected to the output of the delay block of the corresponding channel, the second inputs of the second triggers of the extreme channels are connected to the same inputs of the second triggers of adjacent channels, and the input of each of delay blocks connected to the second input of the first trigger of the corresponding channel. V-SIX Uiilii