SU1337915A1 - Device for magnetic recording and reproduction of digital information - Google Patents

Abstract

The invention relates to the field of information accumulation. The purpose of the invention is to increase the reliability of reproduction of digital information. The front edge selector 14, the trailing edge selector 15, the element NOT 16, the element AND 25, the element OR 24, and the trigger 17 are part of the modulator providing high rectangular phase modulation, and the driver 19 pulses, the front selector 23, the triggers 21 and 22 are part of a demodulator that converts the phase-manipulated code to a serial binary code. 1 il. L7 (L

Description

1133

The invention relates to devices for recording and reproducing digital information.

The purpose of the invention is to increase the credibility of reproducing digital information.

The drawing shows a diagram of a device for magnetic recording and reproducing digital information.

The device contains an address buffer 1, connected by inputs to input buses of address code 2 and outputs to control inputs of transceiver 3 and to inputs of address selector 4, data buffer 5 connected to data code buses 6, buffer 7 of control signals connected to inputs write bus 8 and read input bus 9, an ILL 10 element connected by an output to the service request output bus 1 1, and a programmable timer 12. The address selector A is connected to the transceiver 3 input by the first output 3. Data buffer 5 is connecteddata inputs of transceiver 3. Buffer 7 control signals are connected by outputs to the write and read inputs of transceiver 3, a synchronization input input from an input: another 13 synchronization, connected to a synchronization input of a programmable timer 12. The first output of a programmable timer 12 is connected to a transmission synchronization input transceiver 3, connected to the outputs of readiness to the inputs of the element OR 10.

The device also contains a front-edge selector 14 and a rear-edge selector 15, connected by inputs to the first output nporpaMNmpyeMOro of timer 12, HE 16, connected to the output of the transmitting of the transceiver 3, the first trigger 17, connected by the output to the output bus 18 of the recording, the driver 19 pulses connected by an input to the input playback bus 20, the second trigger 21 are connected by the setup input and the inverse output respectively to the second output and to the control input of the programmable timer 12, the third trigger 22, the selector 23 edges, an additional element OR 24 and element 25. The second trigger 21 is connected by a direct output to the synchronization input of the receiving transceiver 3, the Third trigger 2 is connected by an output to the input of receiving data of the transceiver 3. The output of the selector 14 of the leading edge is connected to the first input of the element 25 connected by the second input to the output of the element HE 16 and the output to the first input of an additional element OR 24 The additional element OR 24 is connected by a second input to the output of the rear edge selector 15 and the output to the counting input of the first trigger EPA 17. Output pulse shaper 19 is connected via the selector 23 with an input synchronization fronts second flip-flop 21 and to an input of the third synchronization trigger 22, the data input connected to a direct output of the second flip-flop 21, a data input coupled to a common bus. The second output of the address selector 4 is connected to the blocking input of programmable timer 12 connected by address inputs to the outputs of buffer 1 of the address connected by data inputs to data buffer 5 and write and read inputs to outputs of control buffer 7.

In the device, the front-edge selector 14, the rear-edge selector 15, the element NOT 16, the element AND 25, the element OR 24 and the first trigger 17 are part of the modulator providing rectangular phase shift keying, and the driver 19 pulses, the front selector 23 and The second 21 and third 22 triggers form a demodulator that converts the phase-shifted code into a serial binary code.

Magnetic recording and reproduction of digital information by means of the device proposed is derived in the following way.

The input address codes 2, the data code buses 6, and the write and read input buses B and 9 receive the address and data codes and the read or write control signals, respectively. When the address code matches the specified code, the address selector 4 generates a enable signal for the transceiver 3, Depending on the presence of a write control signal or a read control signal, a write mode or a read mode is performed.

In the recording mode from the buffer 5 data to the transceiver 3 in the form of a parallel code receives data. Pree31

The transmitter 3 generates a human-readable code, which through element PC 16 is fed to element 25. At the same time, synchronization signals from programmable timer 12 are fed to front-edge selector 14 and rear-end selector 15. The front edge selector 14 and the trailing edge selector 15 generate pulses through an AND 25 element and directly arrive at an additional OR 24 element acting on the counting input of the first trigger 17. From the output of the first trigger 17, the output phase bus 18 arrives in which a logical zero is encoded with the same signal transition as in the previous clock cycle, and the logical one is encoded with an opposite transition.

In the playback mode, the playback result from the magnetic recording medium, coming through the input playback bus 20, passes through the pulse shaper 19 to the edge selector 23, the signal of which affects the synchronization inputs of the second 21 and third 22 triggers. The level of the logical unit from the inverse output of the second trigger 21 is fed to the control input of the programmable timer 12, providing in the last count of pulses. If a change in the data signal occurs during the counting, then the front selector 23 generates a pulse according to which the logic zero level from the direct output of the second trigger 21 is written to the third trigger 22. If during the counting there is no change in the signal level, then to the third trigger 22 rewrites the level of the logical unit. The data from the third flip-flop 22 and the synchronization signal from the second flip-flop 21 are fed to a transceiver 3, which generates a data code, which is fed through the data buffer 5 onto the bus 6 of the data code.

Claims (1)

Invention Formula A device for magnetic recording and playback of digital information containing an address buffer connected by inputs to the input address code buses and connected by outputs to the control input of the transceiver and to the selector inputs address L, prepared by the first output to the transceiver lock input, a data buffer connected to the code length for 1 .1x and connected to the data inputs of the transceiver, a control signal buffer connected by the inputs to the input write bus and to the input read bus and connected 1 output to the input meters of recording and reading a transceiver connected by a synchronization input to a synchronization input bus connected to a synchronized input of a programmable timer connected by a first output to a transmit synchronization input of a transceiver, whose ready availability outputs are connected to the inputs of the OR element connected to the output bus of a service request, output bus recording and input playback bus, characterized in that, in order to increase the reliability of reproduction of digital information, front edge selector and rear edge selector, connected by inputs to the first output of a programmable timer, element NOT connected to the output of the transceiver's transmission, first trigger connected by the output to the output write bus, pulse driver connected to the input to the input bus playback, second trigger, connected by the installation input and the inverse output, respectively, to the second output and to the control input of the programmable timer, and the data input is connected to the common bus, the third one; output with data input of the transceiver, edge selector, additional OR element, and AND element, the second output of the address selector is connected to the lock input of the programmable timer connected by address inputs to the outputs of the address buffer connected to the data inputs to the data buffer and connected to the write and read inputs to control buffer outputs, with the output of the front-edge selector connected to the first input of an AND element connected by a second input to the output of the HE element and connected to the output of the first input of the additional OR gate, a second input which is connected to the output of the trailing edge and a selector connected to the output counting input pern O tripper, asynhroiitatsin trepus, er-trshtera, floor (1 | course of formation of pulse of pulses connected by a course of data to the direct pitch through the front selector with the input of the output of the second 1 ripper and the input of synchronization of the second trigger and the reception of the transceiver.