SU1040514A1 - Device for digital magnetic recording and reproduction - Google Patents

Abstract

A DIGITAL MAGNETIC RECORDING AND PLAYBACK DEVICE, containing an input bus, an analog-to-digital converter, the outputs of which are connected to the inputs of the first register, a recording unit, the output of which is connected to the recording head, serially connected playback head, playback amplifier and information recovery unit, as well as output I1 formation buses and a sync bus connected to a recorder, characterized in that, in order to improve the fidelity of recording and playback of a video gig, in it us soetsi- sequentially; The second register, the pulse train generator, the first conversion unit and the first pulse generator, the peak detector, the third and fourth registers, the outputs of which are connected to the clock of the comparison unit, the output of the third register are connected to the information inputs of the fourth register and the output buses the connected element OR and the first element AND, I sequentially connected the second element OR and the second element AND, trigger, time relay, sequentially connected pulse counter and the second driver pulses, the third and fourth AND elements, the outputs of which are connected to the second inputs of the first and second OR elements respectively, the first trigger output connected to the first inputs of the first and second AND elements, the second inputs of which are connected respectively to the first and second BI moves of the first register, the third and Meiw devices, the outputs of which are connected to the second and third inputs of the second register, and the decoder inputs, the output of the latter being connected to the first (L input of the Trtgegger directly, and from BTOpbiM through a time relay, second From output d flip-flop is connected to the first inputs of the third and fourth epemen-. The second inputs of the second forwarder, I pulses, the second inputs of the third and chechetny elements I are connected to the pulses of the pulse counter, and the input O of the peak detector is connected to the first pulse generator with the input bus, its output is connected to the information input of the analogue four or four the converter, the synchronizing input of which is connected to the output of the first conversion unit, the outputs of the first and second elements OR are connected respectively to the fourth and fifth inputs of the second register, the output of which is connected to the input unit of the recording unit, while the output of the comparison unit is connected to the informative input of the recorder and controlled by the input of the fourth register, the synchronization exo of the comparison unit is connected to the synchronization bus and through the second unit

Description

nepei 48ra -k the first input of the third registration information, the second you code of which is connected to the first output of the recovery unit n to the second code of the third register.

1040514

The invention relates to magnetic recording, in particular, to devices for digital magnetic recording and reproduction.

A device for a magnetic recording and reproducing of a vice-signal is known, comprising a series-connected processing unit of a vice-signal, a frequency modulator, an amplitude modulator and a recording unit connected in series to a playback amplifier, an amplitude-frequency equalizer, a limiter and a frequency demodulator C 3

A disadvantage of the known device is the low fidelity of recording and reproducing a video signal due to the significant effect of interference on the recording-reproducing channel.

A device for digital magnetic recording and reproducing is known comprising a series-connected analog-to-digital converter, a record-play path, an information recovery unit, and a G2 signal synthesizer.

The device has insufficient fidelity to record-play analog information due to the significant effect of synchronization failures.

The purpose of the invention is to transform the ver. recording and playback of the video signal.

To achieve this goal, a digital magnetic recording and playback device containing an input bus, an analog-to-digital converter, the outputs of which are connected to the inputs of the first register, a recording unit whose output is connected to a recording head, serially connected playback head, playback amplifier and information recovery unit as well as exhaust information buses. the second register, the pulse series generator, the first counting unit and the first pulse generator, the peak detector, the third and fourth registers, the outputs of which are connected to the outputs of the comparison unit, the outputs of the third register are connected to the information inputs fourth register and

output busbars, the first OR element and the first AND element sequentially connected, the second OR element and the second AND element, the trigger, relay-time, sequentially

the connected pulse counter and the second pulse shaper, the third and fourth AND elements, the outputs of which are connected to the second inputs of the first and second OR elements respectively

The first output of the trigger is connected to the first inputs of the first and second elements AND, BTOfbte whose inputs are associated respectively with the first and second outputs of the first register, the third and 4eTw.

The main outputs of which are connected to the second and third inputs of the second register and the inputs of the decoder, the output of the latter is connected to the first input of the trigger, and the second through the time relay, the second output of the trigger is connected to the first inputs of the third and fourth elements And and the second pulse generator , the second B. the third and fourth elec

And are connected to the outputs of the pulse counter, and the input of the peak detector is connected to the input of the first one; pulse generator and the input bus its output is connected to the information

the analog-to-digital converter input, the synchronizing input of which is connected to the output of the first conversion unit, the outputs of the first and second OR elements are connected respectively to

the fourth and fifth inputs of the second register, the output of which is connected to the input of the recording unit, while the output of the comparison unit is connected to the information input of the recorder and the control input of the fourth register, the synchronizing input of the comparison unit is connected to the synchronization bus and through the second conversion unit to the first input third register and first exit

the information recovery unit, the second output of which is connected to the second input of the third register.

This leads to an increase in fidelity: recording - reproducing a video signal due to multiple recording of line numbers of a video signal in places of line clock pulses.

The drawing shows a block diagram of a device for a digital magnet. recording and playback (one of the possible options).

The device for digital magnetic recording and playback contains an input bus 1, an analog-to-digital converter 2, the outputs of which are connected to the inputs of the first register 3, a recording unit 4, the output of which is connected to the recording head 5, are connected in series to the playback head 6, the playback amplifier 7. information recovery unit 8, as well as output information buses 9 and synchronization bus 10 connected to recorder 11, additionally contain a second register 12 serially connected, the generator 1.3 series pulse c, the first recalculation unit 14 and the first pulse shaper 15, the peak detector 16, the third and fourth registers 17 and 18, the outputs of which are connected to the inputs of the comparison unit 19, the outputs of the third register 17 are connected to the information inputs of the fourth register 18 and the output buses 9 connected in series the first element OR 20 and the first element AND 21, the second element OR 22 and the second element AND 23, the trigger 24, the time relay 25, the pulse counter 26 and the second pulse generator 27, the third and fourth Elements 28 and 29, the outputs of which are connected to the second inputs of the first and second elements OR 2O and 22, respectively, the first output of the trigger 24 is connected to the first inputs of the first and second elements 21 and 23, the second inputs of which are connected to the first and second terminals respectively. the outputs of the first register 3, the third and fourth outputs of which are connected to the second and third inputs of the second register 12 and the inputs of the decoder, the output of the last connected to the first input of the trigger 24 directly, and to the second input of the trigger 24 - through the time relay 25, the second output of the trigger 24 is connected to the nei inputs of the third and fourth elements And 28 and 29 and the input of the second pulse generator 27, the second inputs of the third and fourth elements And 28 and 29 are connected to the outputs of the pulse counter 26, and the output of the peak detector 16 is connected to the input of the first pulse generator 15 and input bus 1, its output is connected to information input of analog-digital converter 2, the synchronizing input of which is connected to the output of the first recalculation unit 14, the outputs of the first and second elements OR 20 and 22 respectively, with the fourth and fifth inputs of the second register 12, the output of which is connected to the input of the block W: record, while the output of the comparison unit 19 is connected to the information input of the register 11 and the control input of the fourth register 18, the synchronizing input of the comparison unit 19 to the synchronization bus 1O and through the second conversion unit 31 to the first input of the third register 17 and the first output of the information recovery unit 8, the second output of which is connected to the second input of the third register 17.

0

The device works as follows.

The video signal from the input bus 1 is fed to the peak detector 16, the target envelope of the video signal, which is encoded by the analog-to-digital converter 2. The pulse shaper 15 selects the impulses at the time the video signal crosses the zero level. A pulse from the output of the first recalculation unit 14 starts the generator of the 13th series of pulses and rewrites from the analog-digital converter 2 to the first register 3. When a line sync pulse is detected in the video5 signal, the decoder ZO overturns the trigger 24, from the output signal of which the second pulse generator 27 pulses posledtsatelgitnnost pulses, counted by the counter of 26 pulses. In the second register 12, the recordings are recorded from the outputs of the first register 3 and the pulse counter 26, and the information in the second register 12 is promoted by their 5 pulses from the output of the generator 13 series of pulses. From the output of the second register 12, the signal through the unit 4 of the input enters the recording head 5. In this way, the entry of the line number and anachenwe of the higher bit of the video signal signal is dried. Similarly, the synchronization of a clock pulse with the same row number is performed during the time elapsed by the time relay 25. Next, the sample reads the peak values of the video signal, the amount of the coke. is determined by the conversion factor of the first conversion unit 14. The signals reproduced by the playback head 6 through the playback amplifier 7 are fed to the information recovery unit 8, from one of the outputs of which information is transmitted to the second input of the third register 17, and from the other output is siahronisiru by pulsating pulses, it goes to the first input of the third register 17 and to the input of the second conversion unit 31, the conversion factor of which is equal to the number of bits of one code group uppa When the codes at the outputs of the third and fourth registers 17 and 18 are different by a given amount, the output of the comparison unit 19 is formed by a signal from the output of the second conversion unit 31. At the same time, the fourth register 18 records the envelope of the video signal in the given count, which is {1st compared to the newly arriving new values of the video signal. The recorder 11 receives signals from the code of the comparison block 19,

which the registrar 11 registers as contour lines, and digital information of the video signal envelope, synchronous with the signals on the 1O bus synchronous

organization.

The use of the proposed device makes it possible to increase the fidelity of recording and reproducing a video signal when it is machined by repeatedly recording line numbers in places.

synchronous pulses, as well as extends its functionality by registering the isolines of the video signal, mainly in the meteorological apparatus type.

Claims (1)

DEVICE FOR DIGITAL MAGNETIC RECORDING AND PLAYBACK, containing an input bus, an analog-to-digital converter, the outputs of which are connected to the inputs of the first register, a recording unit, the output of which is connected to the recording head; as well as output information buses and a synchronization bus connected to the recorder, with the proviso that, in order to increase the fidelity of recording and playing back a video signal, The second register, the pulse train generator, the first conversion unit and the first pulse generator, the peak detector, the third and fourth registers are connected in series, the outputs of which are connected to the inputs of the comparison unit, the outputs of the third register are connected to the information inputs of the fourth register and output buses, serially connected tser * element OR and the first element AND, ·, serially connected the second element OR and the second element AND, trigger, timer, serially connected pulse counter and in the second pulse shaper, the third and fourth AND elements, the outputs of which are connected to the second inputs of the first and second OR elements respectively, the first trigger output is connected to the first inputs of the first and second AND elements, the second inputs of which are connected respectively with the first and second outputs of the first register , the third and even> the fourth outputs of which are connected to the second and third inputs of the second register and the inputs of the decoder, the output of the latter being connected directly to the first input of the trigger, and to the second via a time relay and a second output latch coupled to the first inputs of the third and fourth elements. and And the input of the second driver, (pulse, the second inputs of the third and fourth * elements And are connected to the outputs of the pulse counter, and the input of the peak detector is connected to the input of the first pulse generator with an input bus, its output is connected to the information input of the analog-to-digital converter, whose synchronizing input is connected to the output of the first conversion unit, the outputs of the first and second elements OR are connected respectively to the fourth and fifth inputs of the second register, the output of which is connected to the input of the unit recording, while the output of the comparison unit is connected to the information input of the recorder and the control input of the fourth register, the synchronizing input of the comparison unit is connected to the synchronization bus and through the second block .1040514 of conversion - to the first input of the third register - information, the second output of which is connected to the first the output of the recovery unit __ chan to the second input of the third register.