SU1427600A1 - Device for synchronizing magnetic recorders - Google Patents

Description

(21) 3896477 / 24-09

(22) 05/11/85

(46) 09/30/88. Bul Number 36

(71) All-Union Scientific Research Institute of Television and Radio Broadcasting

(72) A.S.Shapiro and V.A.Napolsky

(53) 621.397 (088.8)

(56) USSR Author's Certificate No. 218213, cl. H 04 N 5/78, 1967.

(54) DEVICE FOR SYNCHRONIZATION OF MAGNETIC RECORDING DEVICES

(57) The invention relates to a magnetic recording technique. The purpose of the invention is to improve the accuracy of the synchronization of devices. magnetic recording. The device contains shaper (Φ) 1 of signals of marks, key 2, source 3, impulses, reference frequency, reversible counter 4 by control unit 5,

F 6 pulses of the reference signal, F 7 pulses of the difference, counter 8 pulses of the reference frequency, F 9 control -.

pulses and a unit for generating 10 signals controlling the speed of a magnetic tape. In the time interval from the moment the magnetic recording apparatus is turned on in the playback mode — until the magnetic tape passes the Start mark, the device detects the lag or

in the position of the magnetic tape, caused by the trigger x-kami of the magnetic recording apparatus when it is turned on in the playback mode. At the same time, the appearance of the control signal at the output F 1 (9) causes the control of the speed of movement of the magnetic tape in the direction of decreasing (increasing) this speed. This lag or lead is then compensated for at a time interval from the time the tape passes the Start tag until the synchronous operation begins on the magnetic tape. The goal is achieved by the introduction of the counter 8 and F 9. 1 Il.

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The invention relates to the field of magnetic recording and can be used in synchronous magnetic recording apparatus for synchronous reproduction from several magnetic recording apparatus, as well as for electronic editing systems, phonograms and video phonograms.

The purpose of the invention is to improve the synchronization accuracy of magnetic recording apparatus.

The drawing shows an electrical-block diagram of the device for synchronizing magnetic recording devices.

The synchronization device of the magnetic recording apparatus contains the imaging unit of the tag signals 1, the key 2,

The signals for controlling the speed of movement of a magnetic tape are the output of signals controlling the speed of movement of a magnetic tape. The second input of the counter 8 pulses of the reference frequency is the input of the command to enable the playback mode. The device automatically syncI nization of magnetic recording apparatus operates as follows.

In playback mode, they scan, record and record the start of synchronous operation.

5 on a magnetic tape. On magnetic

the tape records a Start mark, determining the start time of synchronous operation on a magnetic tape and a time sufficient for synchronization of the magnetic source .3 impulses of the reference frequency, 20 recordings, and a Stop mark leading the Start mark by a time sufficient for the apparatus to achieve magnetic recording of the nominal speed magnetic denta. When

reversible counter 4, control unit 5 reversible counter, driver 6 of reference signal pulses, driver 7 difference pulses, counter 8 pulses of reference frequency, 25 applications in the device of the magnetic encoder 9 control pulses of the address-time code these tags and block 10 of formation The signals can not be recorded on the tape, but rather by the speed of movement of the magnetic tape.

The output of the former 1 signals a meso zohodimo write labels. After the current is connected to the first input of the key 2, the magnetic tape markup rolls back to the second input of the control unit 5 and set on the Stop label, a reversible counter and the third input of the control signal generating unit 10 of the speed of the magnetic tape. The output of the driver 6 pulses of the reference signal is connected to the first input of the driver 7 pulses spacing and, the output of which is 35

to the corresponding memory as a code of those sections of the magnetic tape, where

The reversible counter control unit 5 sets the reversible counter 4 to the zero state, the key 2 is closed.

The magnetic recorder turns on in playback mode at the time of

The signals for controlling the speed of movement of a magnetic tape are the output of signals controlling the speed of movement of a magnetic tape. The second input of the counter 8 pulses of the reference frequency is the input of the command to enable the playback mode. The automatic synchronization device of the magnetic recording apparatus operates as follows.

In playback mode, they scan, record and record the start of synchronous operation.

on a magnetic tape. On magnetic

tape record label Start, oper; the timing of the start of synchronous operation on a magnetic tape and the time sufficient for synchronization the magnetic mark. Starting enough time for the apparatus to achieve the magnetic recording of the nominal speed of the magnetic dent. When

the use of time-domain code magnetic recording in the apparatus these labels can be recorded not on a tape, but

the use of time-domain code magnetic recording in the apparatus these labels can be recorded not on a tape, but

to the corresponding memory as a code of those sections of the magnetic tape, where

bypass write labels. After marking the magnetic tape, it is rolled back and placed on the Stop label,

The reversible counter control unit 5 sets the reversible counter 4 to the zero state, the key 2 is closed.

The magnetic recorder turns on in playback mode at the time of

one with the third input of key 2. You are Q time ahead of the specified time

start synchronous work on; a known value equal to the time interval from the stop mark to the beginning of synchronous operation on the magnetic tape, frequency and driver 9 control signals; Counter 8 pulses of the reference frequency of the pulses - with the fourth input; the key starts counting the pulses; the output of the source 3 of the reference frequency pulses is connected to the second the input of the key 2 and through serially connected counter 8 pulses of the reference

2, with the first input of the control unit 5 by the reversible counter to the second input of the unit 10 for generating the control signals for the speed of movement of the magnetic tape. The output of the key 2 is connected to the first input of the reversible counter 4. The output of the reversible counter control unit 5 is connected to the second input of the reversible counter 4, the output of which is connected to the first input of the control signal generating unit 10 "magnetic tape speed. Block 10 output form0

five

3 pulses of the reference frequency stupid from the source. When the tape is reached by a magnetic tape. A start at the output of the former of the 1 signal of the mark is obtained, a control signal. The latter may occur earlier or later than the control signal from the output of the control driver imager 9 when the pulse counter of the reference frequency reaches a predetermined value depending on whether the average speed of the magnetic tape movement in the time interval from the moment the magnetic recorder was turned on in the playback mode Start marks are more or less rated.

The reference signal from the tape can be., Syrimer, the pilot tone signal when playing a magnetic recording device on a sound device, or a control signal when playing on a VCR. It is important that the frequency of the pulses of the reference signal reproduced from the magnetic tape at the nominal speed of the tape is equal to the frequency of: the pulses of the reference frequency,

The first of the detected signals will open the passage through the key of 2 pulses coming from the source of 3 pulses of the reference frequency to the first

input of the reversive counter 4. The same 20 magnetic tape from the calculated one.

the pulse through the reversible counter control unit 5 will transfer the reversible counter 4 to the direct counting mode and simultaneously arrive at the unit 10 of generating signals for controlling the speed of the magnetic tape, where it will be memorized. The second of the emerging control signals will open the passage through the key 2 of the difference pulses coming from the formio-ZO advancing in the magnetic position

Waddle 7 difference pulses. The same impulse through the reversible counter control unit 5 will transfer the reversible counter 4 to the counting mode and simultaneously arrive at the block 10 generated by the magnetic tape speed control signals, at the output of which the magnetic tape speed control signal is generated.

The sign of the belt speed control signal depends on which of the control signals is earlier. If earlier on the control signal at the output of the marker signal generator 1, the control of the tape speed will be directed towards lowering this speed. If the control signal at the output of the control pulse shaper 9 was previously turned on, then the control of the belt moving speed will be directed in the direction of increasing this speed. The magnitude of the control signal is determined by the value of the number in the reversible counter 4, operating in the countdown mode -.

When the reverse counter 4 goes into the countdown mode, you

five

The automatic speed control of the magnetic tape is turned on and the speed of two lines of the magnetic tape is controlled by signals, P0; pz: | from the block 10 generating signals controlling the speed of movement of the magnetic tape. The speed control of the magnetic tape will occur until the reversible counter 4, operating in the countdown mode, counts to 0, i.e. This counter counts as many difference pulses as there were previously counted reference pulses on it.

After the change in the speed of movement of the magnetic tape, associated with the compensation of the deviation of the real position, when the number of counted difference pulses is compared to the number of reference frequency pulses, the system automatically adjusts the speed of movement of the magnetic tape, which ensures the movement of the magnetic tape at nominal speed.

So the lag and

the tape, caused by the starting characteristics of the magnetic recorder when it is turned on in the playback mode, will be determined in the time interval from the moment the magnetic recorder is turned on in the playback mode until the start of the Start tag and is compensated in the time interval from. moment of passage: with an agnit tape of the Start label until the beginning of synchronous operation on a magnetic tape. ,

Claims (1)

Invention Formula A device for synchronizing magnetic recording devices containing a tag driver, a key, a source of reference frequency pulses, a reference pulse generator, a reversible counter, a reversible counter control unit, a difference pulse shaper, a magnetic tape speed control signal generating unit, with a signal generator output the tags are connected to the first key input, the output of the reference pulse generator is connected to the first input of the difference pulse generator, the second input of which is combined with the second input of the key and connected to the output of the source of pulses of the reference frequency, 4 output connected to the third input x (l) och, the output of which is connected to the first input of the reversible counter, the first input of which is connected to. a single unit of the control unit of the reversible counter, and an output with the first input unit of the formation of the control signals for the speed of movement of the magnetic tape, the output of which is the code of the control signals for the speed of the moving magnetic tape; This is due to the fact that, in order to improve the accuracy of the synchronization of the magnetic recording apparatus, sequentially connected pulse counters are introduced the reference frequency and the driver of the control pulses, the first input of the pulse counter of the reference frequency is connected to the output of the source of the pulses of the reference frequency, the second input is the input of the command to activate the playback mode, the output of the driver of the control pulses is connected to the fourth key input, first the input of the control unit of the reversible counter and the second input of the generating unit of the control signals of the speed of movement of the magnetic tape, the third input of which is combined with the second input of the control unit- | sivnm counter and is connected to the output of the signal marks.