SU1481847A1 - Digital recording-playback magnetic recorder - Google Patents

Abstract

The invention relates to instrument engineering and is intended for recording and processing information from a magnetic carrier. The elimination of input to the processing line of faulty inter-mode sections of information by recording a sign of the end of the mode and its use during playback to generate control signals increases the speed of the device. 1 il.

Description

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The invention relates to the field of information storage, namely, devices for digital magnetic recording-reproduction.

The aim of the invention is to increase the speed of a device for digital magnetic recording-reproduction.

The drawing shows one of the possible variants of the proposed device for digital magnetic recording-reproduction.

The device contains an analog-to-digital converter 1 connected by the first input to the input bus 2 of information, connected by an output to the first input of a block 3 of shift registers and connected by a second input to the output of a generator of 4 pulses, a counter 5, a driver of 6 clock pulses, a decoder 7, a block 8 of recording -playback, first 9 and second 10 code converters, shift register 11, 12 keys, frequency ratio meter 13, filtering unit 14, switch 15, multiplication unit 16, pulse selector 17 and D-flip-flop 18. Generator benefit 4 imp lsov connected to the second input of the shift register 3, to the first input of the counter 5 and to the first input of the synchronizing impuls1 6 s, which output is coupled to a third input of the three shift registers and a second input connected to the input bus 19 a control signal. The latter is connected via switch 20 to power supply bus 21 and connected to a second input of counter 5 connected by an output to input of decoder 7. The output of decoder 7 is connected to a synchronization input of D-flip-flop 18 connected to the fourth input of block 3 of shift registers whose output is connected with the first input of the recording-play block 8 connected by the first output to the input of the first trans (L

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Former 9 code. The latter is connected by the first output to the first input of the shift register 11 connected by the output to the information input of the key box 12 and connected by the second input to the second output of the first code converter 9 connected to the first input of the frequency ratio meter 13 connected by the output to the input of the multiplication unit 16, which is connected by the output to the third input of the shift register 11 and connected by the second input to the first output of the filtering unit 14 connected by the second output to the control input of the key unit 12 and connected by the first input Through switch 14 with the first output of the selector 17 pulses. The latter is connected by an input to the second output of the recording-reproducing unit 8 and connected by an output to the input of the second converter 10 of the code connected by the output to the second input of the filtering unit 14 and to the second input of the frequency ratio meter 13.

The device also comprises an encoder 22 connected in series, a key 23 and the first element OR 24 inserted between the second output of the shift register unit 3 and the second input of the playback-playback unit 8, the first 25 and second 26 D-flip-flops, the implication element 27, the comparison element 28, shaper 29 of the start mode signal, shaper 30 of the signal of the end of the mode and connected in series an additional pulse generator 31, an additional counter 32, an additional decoder 33, a second element OR 34 and an additional block

35 keys connected by an information input to the output of a block of 12 keys and connected by an output to an output bus made in the form of a line

36 processing information. The first additional D flip-flop 25 is connected by a synchronization input to another output of the decoder 7, connected by an information input to the input bus 19 of the control signal and connected to the third input of recording-playback unit 8 by the first input

to the output of the D-flip-flop 18. Comparison element 28 is connected by an input to another output of the pulse selector 17. Shaper 29 signal start mode and shaper 30 signal con

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This mode is connected by inputs to the second output of the filtering unit 14. The second additional D-flip-flop 26 is connected by an output to the inputs of an additional pulse generator 31 and the second element OR 34 and is connected by synchronization and information inputs to the outputs of the mode start signal generator 29 and the end mode signal generator 30 connected by another input to the output of the comparison element 28, respectively. The second input of the implication element 27 is connected to the output of the first additional D-flip-flop 25, which is connected to the control input of the key 23.

The digital magnetic recording / reproducing apparatus operates as follows.

At the time of the start of any process, a switch 20 is switched on, through which a high potential from the power supply bus 21 sets the D-flip-flop 18 and the first additional D-flip-flop 25 to one state. The voltage from the output of the first additional D-flip-flop 25 enters the recording-reproducing unit 8, including a recording mode at which the tape begins to gain the nominal movement speed. At the same time, the voltage from the output of the D-flip-flop 18 resets the block 3 of the shift registers to the zero state. In addition, the counter 5 is reset to the zero state and the next recording mode number is set in the shaper of 6 clock pulses. The pulse generator 4 begins to interrogate the analog-digital converter 1 and the driver 6 clock pulses. The measurement information starts to arrive in binary code from the input bus 2 of information to the block 3 of shift registers to which the number of the recording mode is supplied from the generator 6 of clock pulses. The advancement of information in block 3 of the shift registers is produced by pulses of the generator 4 pulses. At the same time, the delay time in block 3 of the shift registers is chosen to be equal to the time for which the magnetic tape sets the nominal movement speed. Due to this, after dialing with a magnetic tape of the nominal speed of movement, the measuring device starts to arrive in the recording-playback unit 8

on the information and information about the recording mode number. At the time of the end of the process, the switch 20 is turned off, and the counter 5 starts counting the pulses from the generator of 4 pulses. When the counter 5 counts the number of pulses corresponding to the delay time in block 3 of the shift registers, the decoder 7 generates a signal that resets the D-flip-flop 18 to the zero state. In this case, the shift register unit 3 is closed, and in the record-playback unit 8, the recording of information from the analog-digital converter 1 and the generator 6 of clock pulses stops. At the same time, the D-flip-flop 18 and the first additional D-flip-flop 25 provide, in the implication element 27, a signal that opens the key 23. At that, the encoder 22 through the key 23 and the first OR element 24 starts recording the number that does not correspond to the possible recording mode numbers and Thereafter, as a sign of the end of the recording process. After the counter 5 has counted some more pulses, the decoder 7 generates a signal that resets the first additional D-flip-flop 25. At this magnet, the tape-playback-recording unit 8 starts to stop, the implication element 27 closes the key 23, and the number recording from the encoder 22 stops. In a similar way, information of all subsequent modes is recorded.

For output to the information processing line 36, starting with a mode, the corresponding numbers are set in the second code converter 10, and the reproduced binary code of this mode from the second output of the recording-playback unit 8 goes through the pulse selector 17 to the second code converter 10, where it is compared with a given value. The second converter 10 of the code generates a signal passing through the filtering unit 14 to the control input of the block 12 of keys. Due to this, the measurement information from the shift register 11 passes through the key block 12, as well as through the additional key block 35 to the information processing line 36. In this case, the comparison element 28 produces sig

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cash coming to the shaper 30 signal end of the mode. The latter, by coincidence of the leading edges of the signals of the end of the mode and the signal of the comparison element 28, generates a pulse that sets the second additional D-flip-flop 26 into one state, and it closes the additional key block 35 via the second OR 34 element. Due to this, the input of measurement information into the information processing line 36 is stopped until the start signal generator 29

5 mode does not transfer the second additional D-trigger 26 to the zero state. At that, the additional key block 35 opens, and the measurement information of the next mode starts to flow into the information processing line 36. After entering the measurement information of the last mode, the additional key block 35 remains open, since the next signal from the driver 29 of the mode start signal does not arrive at the clock input of the second additional D-flip-flop 26. The additional key block 35 is closed in this case.

0 by an additional decoder 33 only after the additional counter 32 counts a certain number of pulses of the additional generator 31 of the pulses.

Claims (1)

Invention Formula A device for digital magnetic recording-reproduction containing an analog-to-digital converter connected by a first input to an information input bus, connected by an output to a first input of a shift register unit and connected by a second input to an output of a pulse generator connected to a second input of a shift register unit, to the first input the counter and to the first input of the generator of synchronizing pulses, which is connected by an output to the third input of the block of shift registers and is connected by a second input to the input bus of the signal control, connected to the second input of the counter, connected by the output to the input of the decoder, the output of which is connected to the synchronization input of the D-flip-flop, connected by the output to the fourth input of the shift register unit, the output of which connected to the first input of the recording-playback unit connected by the first output to the input of the first code converter, the first output of which is connected to the first input of the shift register connected by the output to the information input of the key unit. And connected by the second input to the second output of the first code converter, connected to the first input of the frequency ratio meter connected by the output to the input of the unit, multiplying which is connected to the third input of the shift register and connected to the first output by the second input a filtering unit connected by a second output to a control input of a key unit and connected by a first input through a switch to a first output of a pulse selector which is connected by an input to a second output of a recording-playback unit and connected by an output to an input of a second converter code connected by an output to the second input of a filtering unit and with the second input of the frequency ratio meter, and the output bus, characterized in that, in order to improve speed, a coder, a key and a first connected in series are inserted into it lement OR connected between the second output of the shift register and the second input of the recording-reproduction REFERENCE connected in series additional pulse generator, an additional counter, an additional decoder, a second OR element and an additional key block connected by an information input to the output of the key block and connected by an output to the output bus, an implication element connected by the first input to the D-trigger output, the first additional D-trigger connected by the synchronizing input to another output of the decoder, connected by the information input to the input bus of the control signal and connected by the output to the third input of the recording-playback unit, the comparison element, under Connected by the input to another output of the pulse selector, the shaper of the mode start signal and the shaper of the end of the mode signal, connected by inputs to the second output of the filtering unit, and the second additional D-flip-flop, the second additional D-flip-flop being connected by the output to the inputs of the additional pulse generator and the second element OR and connected to the synchronization and informational inputs with the outputs, respectively, of the driver of the start signal of the mode and the driver of the signal of the end of the mode connected by another input to the output of the comparison element, and the second input of the implication element is connected to the output of the first additional D-flip-flop connected to the control input I of the key.