SU801062A1 - Device for reproducing multichannel information - Google Patents

Description

The invention relates to a magnetic recording technique, in particular, to devices for reproducing multi channel information with correction of media distortions.

A device for reproducing multi-channel information is known, in which the skew correction is performed by manually adjusting the delay selector using the reference tape l.

However, due to the static nature of the correction, this device is critical to dynamic distortions arising due to changes in carrier speed, magnetic head drift, etc., periodic adjustment of delays in the playback channels is required, recordings of different drives are not compatible, which makes it difficult , reduces the reliability of reproduction of information.

Closest to the present invention is a device for reproducing multi-channel information containing a reproducing unit, an information output unit, a counting measurement. tel time intervals as well

a delay selection unit connected to the comparison unit.

The disadvantage of the device - re-. The construction of the delay selector when changing the playback speed makes it difficult to operate and the playback reliability is not high enough.

The purpose of the invention is to increase the reliability of reproduction of information.

The goal is achieved by introducing an OR element whose inputs are respectively associated with the outputs of the playback unit, a delay element connected between the individual outputs of the information output unit, to a device for reproducing multi-channel information containing a playback unit, an information output block and a time counter. and the entry of the OR element, controlled delay lines, the number of which is equal to the number of information channels, as well as additional time counter meters, to the number of which is one less than the number of information channels, with the first

the inputs of all time meters and all controllable delay lines are connected to the corresponding outputs of the playback unit, the output of the OR element is connected to the second inputs of time meters, the outputs of which are connected to the second inputs of the corresponding controlled delay lines, and the outputs of the latter are connected respectively to input block output information.

FIG. 1 is a block diagram of the device according to the invention; FIG. 2 shows timing diagrams explaining its operation.

The device contains (Fig. 1) playback unit 1 and information output unit 2 connected to it, forming n playback channels. A controllable 3 delay line is included in each of the n connecting lines between blocks 1 and 2. Each of the n playback channels is also provided with a counting meter of 4 time intervals, the start input of which is connected to the output of the element OR 5, the stop input to the same output of playback unit 1, and the output to the control input of the control line 3 of the same channel. Inputs of circuit 5 connected to the outputs of the playback unit 1 and through the delayed element b to the information output unit 2. Each of the controllable 3 delay lines is made with a line

7 delays and a switch 8 of its discrete outputs, and counting meters of 4 time intervals are made according to the scheme: 9 clock pulse generator (GTI) - counter 10 - trigger 11 - 12 coincidence circuit. Practically they can be executed

with general GTI.

The device operates in the following way.

From the output of the playback unit 1, the information pulses of the first byte with skews relative to the first pulse arrive at the inputs of the separation circuit 5 and, channel by channel, to the inputs of the controlled delay lines 3. At the first pulse arriving at the input of the .5 circuit, the output of the circuit 5 is the pulse of the beginning of the intervals (the starting pulse), which is applied to the triggers 11 (the starting inputs of the blocks 4). The flip-flops are flung and open the coincidence circuits 12, with the result that the pulses from the GTI 9 begin to pass to the counters 10.

8, as the pulse of the end of the interval (stop pulse), the information pulse of the corresponding channel is used. A stop pulse is applied to the trigger 11 (the stop input of block 4) and returns it to its initial state, in which the GTI 9 pulses to the input of the counter 10 do not pass. Thus, in the counter 10, a code is determined, determined by the number of pulses passed through the circuit 12 of coincidence, i.e. the value of the time interval.

From the output of the 4-slot counting meter, the code signal corresponding to this time interval is fed to the control input of the switch 8, which connects to the information output unit 2 a discrete output of the delay line 7, at which the information pulse delay is tg-t, where t is the correction interval {constant value), - skew in the i-th channel.

Thus, in each playback channel, an information pulse having an initial delay relative to the first pulse (skew) is additionally delayed by time. Taking into account the distortions, all the pulses are committed to an identical time to the first 3 pulses. From the outputs of the controlled delay lines 3 to the information output unit 2, the discharge byte pulses arrive simultaneously.

On the leading edge of the corrected pulses of the first byte, the synchronizer GTI is launched in block 2 (not shown) with a pulse following period T (Fig. 2). The sync pulses from the output of block 2 are delayed by the delay element b for a constant time T-t (figure 2) and are fed to one of the inputs of circuit 5, where they perform the role of the first pulse (defining the beginning of intervals) for bytes, beginning at the second one. In the subsequent bytes (starting from the second), the distortions are corrected in the same way as the one described, with the difference that the starting pulse is emitted by the sync pulses from the output of block 2 at intervals T. .

Claims (2)

In the proposed device, the skew correction does not depend on the change in the playback speed (in general, on the change in the velocity of the carrier) as all byte bit signals are delayed by taking into account the initial skews for a constant time t. Almost any correction accuracy is achieved, since it depends only on the frequency of the GTI 9, which ensures the high compatibility of the records of various drives in the computer system with a single information structure. Claims An apparatus for reproducing multi-channel information comprising a reproducing unit, an information outputting unit, and a time meter counting unit, t.ch.ch with the fact that, in order to increase the reproducibility of the reproduction of information, the inputs are entered into it which are respectively associated with the outputs of the playback unit, the delay element connected between the individual outputs of the information output unit and the input of the OR element, the controlled delay lines, the number of which is equal to the number of channels Formations, as well as additional estimated time interval meters, the number of which is one less than the number of information channels, the first inputs of all time meters and all controlled delay lines are connected to the corresponding outputs of the playback unit, the output of the OR element is connected to the second inputs of the counting time interval meters, the outputs of which are connected with the second inputs of the corresponding controlled delay lines, and the outputs of the latter are connected respectively to the inputs b data output locale. Source and information taken into account in the examination 1. Technical description of the EU 5017-0 1210Н: 001.2в ТО. 2. The author's certificate of the USSR 570093, cl. G 11 V 5 / 43,28.10.75 (prototype). . .