SU781926A1 - Device for control of digital magnetic recording apparatus tape-driving mechanism - Google Patents

Description

(54) DEVICE CONTROL DEVICE OF LENTA-BRAIN MECHANISM OF DIGITAL MAGNETIC MACHINE

I.

The invention relates to instrumentation, in particular, to digital recording control equipment - reproducing on a magnet years, and can be used in devices for recording and reproducing information on magnetic tape. S

A device for recording on a magnetic tape is known, in which the linear dimensions of the inter-spacing are set using a block for generating intervals between three gaps and a tape on a magnetic tape of information l.

The drawbacks of this device are the complexity of the control circuit, as well as the impossibility of implementing multiple slots due to the low accuracy of keeping the linear dimensions of the inter-band gaps due to the absence of a direct connection between the compared mechanical and electrical parameters (for example, the amount of tape mixing and the electrical control signal.

RECORDS

The closest to the proposed technical entity is a device containing mates connected to a common control unit directly (through the circuit as well, neither the tape position nor the tact detection circuit, each of which consists of consecutively connected autonomous controls, the second input of which is directly connected to the common control unit, from the counter and the decoder, connected to the common control block of the recording and playback channel and the series-connected amplifier, electr a rotor and a tape position sensor, the output of which is connected via a stabilizer to the second input of the amplifier and directly to the third input of the independent tape control circuit determining the position of the tape {2j.

A disadvantage of this device is the impossibility of multiple rewriting of an information zone within an array of zones due to partial erasure of adjacent zones.

information due to the displacement of the zone from its nominal position. This shift is due to the accumulation of an error in determining the position of the tape relative to the magnet head assembly, which is caused by the low resolution of existing position sensors.

The purpose of the invention is to improve the reliability of the device during repeated rewriting of information.

The goal is achieved by introducing into the device a generator and an electrical circuit for determining the adjusted position of the tape, consisting of a successor ;; HP of connected other independent control units, a counter and a decoder;

JI is on; between the separate input and output of the common control unit, the generator is connected to the recording and playback channel and the second inputs of the autonomous control unit for determining the specified position of the tape and the stabilizer, and the circuit counter is defined; the position of the tape and the determining circuit tapes are reversible,

Fig. 1 is a functional diagram of the device for controlling a HbiM tape machine: a digital magnetic recording apparatus; figure 2 - the principle of operation of the device.

The proposed device consists of a conjugate unit 1 and a common control unit 2 connected to it, a control unit 3 and a control unit 4 connected to the interface unit 1, a common control unit 2 of counters 5 and b, respectively, which are in turn connected via corresponding to the power supply unit 7 and 8 to the common control unit 2, the amplifier 9 of the drive connected to the general unit 2 control unit, the electric motor 10 connected to the amplifier 9 of the drive, the sensor 11 of the tape position, mechanically connected to the electric motor 10 and connected to the independent speed control unit 3, the speed stabilizer 12. connected to the drive amplifier 9, the stable frequency generator 13 and the tape position sensor 11, the independent control unit 14 connected to the common control unit 2, the stable frequency generator 13 and the counter 15, which is connected via a decoder 16 to a common etching unit 2, and also from a reproduction channel 17.

. The device works as follows.

Interface unit 1 provides communication with other devices, such as a computer. The recording-playback process is divided into separate measures, such as recording, control playback, reverse mode.

Switching the counter 6 cycles and jc setting it to a certain state is carried out by the signals of the control unit 4, the inputs of which receive signals from the general unit 2 control and command signals from the unit 1 with the channel. Sensor. The 11th position of the tape generates signals when the shaft of the electric motor 10 rotates in any direction. Deciphering the states of counters 5, 6 and 15 of the axis of the distribution with the help of appropriate decoders 7, 8 and 16. The shaft stabilization circuit 12 of the anti-rotor motor ensures that the distance between the horizontal distance on the tape is adhered to.

In the forward direction of the tape movement, the end B of the recorded data zone is detected by sending signals from the tape position counter 15 to the forward counting input of the tape position detection circuit 5 and simultaneously the counter reset signal, which is generated when the information line passes by the magnetic playback head.

Tar as the moment of passage of the end of zone B may not coincide with the front of the signal from the tape position sensor 11, distance C from the end of the zone to the first signal counted by the counter 5 may fluctuate from zero to the period of the signal from the tape position sensor when it is stable. tape speed.

The refined position determination circuit counter counts the signals from the stable frequency generator for a period of time, while the position counter is reset to zero and at the same time it is reset by the same reset signal as the detection circuit counter. tape position

Thus, the tape position detection circuit counter counts the number of signals from the position sensor that went after the end of zone B, and the refined position counter circuit counts the number of fractions of the signal period from G1 to the positioner that fit in the interval C from the end of the previous zone from the first counted pulse from the position sensor and presented by pulses from a generator of a stable frequency.

In the case of reverse direction of the tape, the beginning of zone A is detected in a similar way, with the only difference that the bill signadas arrive at the counting inputs of counters 5 and 15, and the large reset signals now set the lot counters to N and vyi corresponding to the beginning of zone A. stopping the engine after the end of treatment of the zone, the sweepers 5 and 15 are not reset and they remember the position of the processed 3 (us. When passing other commands, the counters supply is taken into account.

The magnitude of the interband gap corresponds to AND the full periods of the signal from the position sensor. The moment of switching the position counter to the state -I corresponds to n-1 full periods and one incomplete. The number of fractions of this partial period is stored in the counter of the refined position determination circuit and is equal to K.

The next write command again starts the engine and signals from the position sensor begin to flow. As soon as the counter of the position determination circuit compiles the signals, the counter of the refined position is switched on and the shares missing for the entire period are reached, and the counter of the refined position chain assumes the state Un. Srabatiyuvanie appropriate decipher says that you can start recording a new zone.

Claims (2)

Invention Formula A device for controlling a tape mechanism of a digital magnetic recording apparatus, comprising an interface unit 5 connected to a common control unit directly as well as; a tape position detection circuit and through the tact detection circuit, each of which consists of a serially connected autonomous control unit, the second input of which is connected to a common control unit. From the counter and the decoder, connected to the common control unit, the recording and playback channel and the series-connected amplifier, electric motor and tape position sensor, the output of which is connected to a cut stabilizer to the second input of the amplifier and directly to the third input of the autonomous control circuit of the tape position detection, about tl and. h so that, in order to increase the reliability of the device during repeated rewriting of information, a generator and an electrical circuit for determining the specified tape position, consisting of other autonomous control unit, counter and decoder connected in series, are inserted into the device | Between the individual inputs to the output of the common control unit, while the generator is connected to the recording and playback channel and to the second inputs of the autonomous control unit of the determination circuit the adjusted position of the tape and the stabilizer, and the counters of the circuit for determining the position of the tape and the circuit for determining the specified. jHoro position of the tape are reversible. Sources of information taken into account in the examination. 1. The patent of France No. 2266256, cl. Q 11 At 15/46, published 11.28.75. 2. USSR author's certificate N9 455365, cl. Q 11 B 5 / O2, published 08.22.73 (prototype). MS J in