SU1327166A2 - Apparatus for digital magnetic record of video signal - Google Patents

Abstract

This invention relates to magnetic recording. The purpose of the invention is to improve the recording accuracy. The device contains a shaper 1 module, a peak detector 3, an amplifier 4, an analog-digital converter 5, registers 6 and 9, elements AND 7, 15, 21 and 25, elements OR 8, 23, a recording unit 10 with a recording head 11, shapers 12 , 19 and 28 pulses, blocks 13 and 20 recalculations, 14 pulse series generator, threshold element 16, counters 17, 22 pulses, decoder 18, 24 pulse generator, output relay 26 and triggers 27 and 29. Introduction of new elements and the formation of new The zone between the elements of the device allows the corresponding infrared range to be radiated. be recorded on the magnetic carrier with unity gain. 2 Il.

Description

The invention relates to magnetic recording, in particular, to devices for digital magnetic recording of a video signal transmitted by meteorological satellites, and is an improvement of the device according to the author. USSR 1078461.

The purpose of the invention is to improve the recording accuracy.

Figure 1 shows the structural scheme of the device; figure 2 - the Structure of the line of the video signal transmitted by the meteorological satellite type NOAA,

A device for digital magnetic recording of a video signal (Fig. 1) contains a module driver 1, an input connected to an input terminal 2, and an output to a peak detector 3, the output of which is connected through an amplifier 4 with controlled gain to an information input of an analog-digital converter ( ADC) 5, the output of which is through the first register 6, the first elements And 7, the first elements OR 8 are connected to the outputs of the second register 9, the output connected through the block 10 to the recording magnetic head 11. Input zazh1Sh 2 connected through the first driver 12 pulses, unit 13 conversion, generator 14 cepHJi pulses to the clock input A1SCH 5 ,. to the input of the shift register 9 and to the second element. And 15. The output of the peak detector 3 is also connected to the threshold element 16, the output connected to the

The input video signal, which represents the amplitude-modulated oscillation, is fed via terminal 2 to the shaper of the I module, which allocates 25 voltages proportional to the absolute value of the input signal. After the envelope has been extracted using the peak detector 3, the signal is amplified by the amplifier 4 and fed to an A / D converter 5 triggered by a pulse from the output of the conversion unit 13 counting the number of periods of the carrier oscillation of the input signal. At the same time, the input signal envelope is fed to threshold element 16, which provides a high voltage potential in the time intervals between threshold level crossings with positive and negative derivative signs. In the tenth input of the first counter of 17 pulses and the control input of the decoding of the action of this potential of the counter 18 through the second driver 17 counts the pulses of the generation of 19 pulses. The output of the decoder 8 is connected to the second conversion unit 20, the outputs connected to the inputs of the third element part 21 and directly to the counting input of the second counter 22 pulses through the second element OR 23. The counting input of the first counter 17 pulses is connected to the generator 24 pulses through the fourth element And 25, one of the inputs of which is connected to the output of the time relay 26, the input connected to the exhaust 24 from the output element I 25, open for the time of the search for the clock signal of the relay. 26 time. At the moment

45 of the termination of this potential, the pulse decoder 18 is interrogated by the pulse former 19, and the pulse counter 17 is reset. When the duration of the potential of the threshold element 16 corresponds to one of the types of the sync signal element of the string, the decoder 18 pulse to one of the conversion blocks 20. Upon receipt of the corresponding number imdom element SHSh 23, also connected to one of the inputs of the first, trigger 27. The output of the time relay 26 is connected via a third pulse generator 28 to the input of the second trigger 29, the second input of which is connected

five

., „

It is connected to the output of one of the conversion units 20, and the output to the control input of amplifier 4 with controllable gain.

The signal line of the video signal transmitted by the NOAA satellite contains (Figure 2) the clock signal A of the television signal, the sounding signal B, the useful information signal B in the television emission range, the signal of the telemetry data of the television signal D, the synchronization signal D of the infrared signal, the sounding signal E of space , a signal W of useful information in the infrared range of the radiation and a signal 3 of the telemetry data of the infrared signal.

The device works as follows.

The input video signal, which represents the amplitude-modulated oscillation, is fed via terminal 2 to the shaper of the I module, which allocates 25 voltages proportional to the absolute value of the input signal. After the envelope has been extracted using the peak detector 3, the signal is amplified by the amplifier 4 and fed to an A / D converter 5 triggered by a pulse from the output of the conversion unit 13 counting the number of periods of the carrier oscillation of the input signal. At the same time, the input signal envelope is fed to threshold element 16, which provides a high voltage potential in the time intervals between threshold level crossings with positive and negative derivative signs. In those0

thirty

40 of the action of this potential, the counter 17 counts the pulses of the

40 of the action of this potential, the counter 17 counts the pulses of the

torus 24 from the output element And 25, open at the time of the search for the clock signal of the relay. 26 time. At the moment

45 of the termination of this potential, the pulse decoder 18 is interrogated by the pulse former 19, and the pulse counter 17 is reset. When the duration of the potential of the threshold element 16 corresponds to one of the types of the sync signal element of the string, the decoder 18 pulse to one of the conversion blocks 20. When a corresponding number of 55 pulses is received on one of the conversion blocks 20, which means the detection of a clock signal of a certain type, the output pulse of this conversion block enters through the element OR 23

31

22 counts into the counting input of the counter, transfers trigger 27, starts the time relay 26 and sets the recalculation units 20 to the initial states. At this, the state of the outputs of the conversion blocks 20 corresponding to the code of the sync signal of the row, and the counter code 22 corresponding to the current line number of the input video signal through And 21 elements opened by a high potential of the trigger 27, and the elements of OR 8 are fed to the register 9. When using the pulses of the generator of the 14 series of pulses, the register code 9 is shifted and the code is written by the recording unit 10 and the magnetic recording head 11. The trigger 27 of the pulses of the recalculation unit 1 3 through the AND element 15 is reset, in which the recording of digital equivalents by the bending of the input signal continues on a magnetic carrier. A time relay 26 triggered upon detection of a row sync signal closes AND 25, which eliminates the possibility of false detection of a sync signal during its duration. If the detected type of sync signal corresponds to a television signal (pos. A, Fig.2), then the impulse of the corresponding recalculation unit 20 flips trigger 29, which increases the gain of amplifier 4. Therefore A1SCH 5 converts the amplified input signal into code. and G, Fig. 2), which through register 6, elements I 7, opened during

0.25 seconds

Editor L.Povkhan

Compiled by S.Egorov Tehred L. Oliynyk

Proofreading M. Pozho Subscription

Order 3395/48 Circulation 589

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4.

ten

15

27

25

20

0

five

1664

the length of the string by the trigger 27, and the elements OR 8 is fed to the register 9 and is recorded on magnetic media using the recording unit 10 and the magnetic recording head 11. At the end of the potential of the time relay 26, the driver 28 is triggered, the output pulse of which forks the trigger 29, which causes a decrease in the gain of the amplifier 4. Therefore. The mu signal corresponding to the infrared range of the radiation is recorded on a magnetic carrier with a unit gain. Similarly, the device continues to operate as each new video line arrives.

Forya from b rete and

A device for digital magnetic recording of video signals by aut. St. No. 1078461, which differs in that, in order to improve the recording accuracy, a controlled amplifier, an additional trigger and a pulse shaper were entered into it, the first additional trigger input connected via an additional pulse shaper to the output of the timing relay, the second the input is with the output of one of the conversion blocks, and the peak detector is connected to the analog-to-digital converter via a controlled amplifier, the control input of which is connected to the output of an additional trigger.

 seconds

Fi.2

Proofreading M. Pozho Subscription

Claims (1)

Claim A device for digital magnetic video recording according to ed. St. No. 1078461, characterized in that, in order to improve the accuracy of recording, a controlled amplifier, an additional trigger and a pulse shaper are introduced into it, while the first input of the additional trigger is connected through an additional pulse shaper to the output of the time relay, the second input to the output of one of the blocks conversion, and the peak detector is connected to an analog-to-digital converter through a controlled amplifier, the control input of which is connected to the output of an additional trigger. 0.25 sec 0.25 sec --------------- 1 --------------—--------- 1 A | 5 | IN G D E /TO s 1 FIG. 2