SU781928A1 - Magnetic recording apparatus control device - Google Patents

Description

The invention relates to instrumentation, namely to the technique of magnetic recording and can be used for continuous recording of information.

A device for magnetic recording is known, comprising a reversible tape- ⁵ broaching mechanism, magnetic heads, amplifiers, a generator, a switch, a switch and a threshold element, in which special separate magnetic heads are used to record and reproduce marker marks to increase the useful area of the magnetic tape ζΐ }.

However, this arrangement complicates _{concentration)} struction tape ₅ 'of the mechanism, increasing its size, weight, and dynamic imbalance between channels and instability speed of the magnetic tape. 20

The closest in technical essence is a device for controlling a magnetic recording apparatus containing recording and reproduction heads of information and control signals, a shaper connected to the output of the control signal playback head and a control unit, the first output of which is connected to the tape drive mechanism M ·

The disadvantage of this device is the possibility of a false control signal appearing during the recording of information at the output of the driver from the signal in parts of the magnetic tape where there are no labels. Moreover, this instability of the known device increases when it is used in conditions of high or low ambient temperature. Moreover, the reversal of the magnetic tape does not occur at the ends of the recording tracks, which reduces the reliability of the device.

The purpose of the invention is to increase the reliability of the device.

This goal is achieved by the fact that in a device for controlling a magnetic recording apparatus containing heads—

recording and playback of information and control signals, a shaper connected to the output of the control signal playback head and the control unit, the first one is connected directly to the 5th tape drive, the first trigger, one-shot, inverter, coincidence element, the first are connected in series with the output of the shaper a delay unit, a second trigger and a second 1C swarm delay unit connected to the input of the control unit, the second output of which is connected to the controlled input of the first delay unit, while the pit and inverse outputs of the first trigger ~ 2 U are connected respectively to the second inputs of the coincidence element and the second trigger.

The drawing shows a structural diagram of the device. 2 (

The device comprises a magnetic tape 1, a reverse tape drive mechanism 2, magnetic Heads 3 and 4 of the recording of playback 5 and 6, paired with;

moving magnetic tape 1 and connected through their switches 7 and 8:

to the recording amplifier 9 and the playing amplifier 10, respectively. A magnetic head 6 reproducing a signal from a Track, at the ends of which a record of marker marks of the beginning of the reverse at the ends of this track is recorded. From the control unit 19 via the bus 22, commands are issued to the speeds in a single-shot 15 to switch the duration of the pulse generated by it in connection with the operation of the device at various speeds of transportation of the magnetic tape. The bus 23 is designed to set the trigger 13 in its original state.

The number of recording amplifiers 9 and playback amplifiers 10, as well as switchable groups of magnetic recording heads and magnetic playback heads, can be arbitrary. In the proposed structural scheme, all recording heads are switched with one recording amplifier 9, and all playback heads with one information reproducing amplifier 10.

The device operates as follows.

The pulses reproduced by the magnetic head 6 from the output of the amplifier-former 11 are supplied to the counting input of the trigger 12, which changes its timing of the reverse start, in addition, it is connected through the former 11 of the playback signal to the counting input of the trigger 12. The inverse output of the trigger 12 is connected to the input of the second trigger 13, and the direct output is connected to one of the inputs of the coincidence element AND 14 directly, with the second through the one-shot 15 and inverter 16. The output of the AND .14 element is connected through the delay unit 17 to the installation input of the trigger RA 13. Its output is connected through the second delay unit 18 and the control unit 19 with a tape ~ Drawn mechanism 2 and switches 7 and 8 of the magnetic heads. On the bus 20;

quartzized enters the single-shot 15 .. _ the pulse sequence is necessary for the formation of 15 standard pulses with a stable _____ duration by a single-shot. Shina21 intended for marking magnet · hydrochloric tape from the external oscillator (not shown) on the bus 21 at the proper time da pis ^^ '^ ^^ Yee ergvnaya / posledovatolnost'prymougolnyh consequently pulses with a frequency _{in the} i _t 5_2 glad maximum frequency following pulses of the recorded information. This de-energizes with the arrival of each impulse. The trigger 12, which works as a frequency divider by two, is designed to increase the accuracy of the operation of the formation circuit of the reverse start signal and converts the reproduced sequence of pulses into a pulse signal, the distance between adjacent edges in which will be equal to the repetition period of the reproduced pulses at the output of the amplifier-former 11. The ego allows further comparison with the reference interval of the repetition period of the reproducible pulses, rather than their duration, which is influenced by many factors and is an unstable parameter of the playback signal. From the positive front of each pulse taken from the direct output of the trigger 12, a single-shot 15 is launched, at the output of which pulses of positive polarity with a calibrated duration are formed. The inverted pulses are fed to one of the inputs of the logic circuit I. 14. The duration of the reference output pulse of a single-shot is set to be shorter than the minimum period for following a continuous sequence of pulses reproduced from the marker mark section by a certain value; / value (for example 10%), necessary for reliable overlap of possible deviations of duration 781928 period of the reproduced service signal from its nominal value and thereby ensuring reliable tag capture. When reproducing the label signal, the duration of positive 5 pulses at the direct output of trip-. Hera 12 and, therefore, at the second input of the element And 14 will be longer than the duration of the reference pulse of a single vibrator. In this case, the output of the Sov-10 circuit of fall 14 and the installation input R of the trigger 13 will be low, allowing the potential for the trigger. In this case, the trigger 13 will tip over from the first positive edge of the pulse signal -> 1.5 l entering its input C from the inverse output of the trigger 12. The resulting high potential at the direct output of the trigger 13 will arrive with a delay, through the delay unit 18 to the control unit 19 , 20 which according to this signal will turn on the reverse of the tape drive mechanism 2 and the corresponding switching of the magnetic heads 3-6.

The delay circuit 18 is designed to 25 prevent the appearance of a false signal at the input of the control unit 19 ό the beginning of the reverse, which will be generated by the trigger 13 in those cases when a random, 30 single repetition period of the signal pulses at the output of the playback amplifier 11 is equal to the reference interval.

During the reproduction by the magnetic head 6 of the information recorded 35 on the same track where the marker marks are recorded, the duration of the positive pulses at the direct output of the trigger 12 will certainly always be longer than the duration of the reference pulse. At that, 40 pulses of positive polarity will be formed at the output of the And 14 element, the leading edge of which appears along the trailing edge of the negative reference pulse, and the trailing edge - along the trailing 45 front of the positive output pulse of the trigger 12. The pulse from the output of the And 14 element arrives with a certain delay determined block 17 delay on the installation input R of the trigger 13 50 and sets it to its original position. In addition, since this pulse is delayed, including its trailing edge, relative to the positive edges of the pulse signal from the inverse output of trigger 12 to input C of trigger 13, it blocks the trigger during the appearance of positive switching trigger fronts at its input C. This eliminates the trigger 13 when the duration of the minimum repetition period of the pulses reproduced by the magnetic head 6 is greater than the reference interval, which always takes place in parts of the track where recording is made Info.

The proposed device exclusion delayed start reverse tape is guaranteed the possibility of recording information on the entire length of each track, with a long recording information by its posLedo- ^{g of} successive recording tracks in all conditions of repeated reversal of the magnetic tape.

Claims (2)

(54) DEVICE FOR CONTROLLING THE DEVICE The invention relates to a device, namely, a magnetic recording technique and can be used for continuous recording of information. A magnetic recording device containing a reversible tape mechanism, magnetic heads, amplifiers, a generator, a switch, a switch and a portable element is known in which special individual magnetic heads are used to record and reproduce marker tags 1 to increase the useful use of the area of a magnetic tape. However, this device complicates the design of the tape mechanism, increasing its dimensions, weight, dynamic misalignment between the channels and the instability of the motor speed. magnetic tape The closest in technical essence is a device for controlling a magnetic recording apparatus, comprising recording and reproducing magnetic recording and control signals, a driver connected to the output of the control signals playback head and a control unit, the first output of which is connected to a tape. 2. The disadvantage of the device is the possibility of the appearance in the driver of the recording of information of a false control signal at the output of the driver from the signal on the sections of the magnetic tape, no label. Moreover, this instability of the operation of the known device increases with the operation of the exchanger in conditions of increased sludge at a low ambient temperature. In this case, the reversal of the magnetic tape does not occur on the recording tracks, which reduces the reliability of the device. The purpose of the invention is to increase the reliability of the device. This object is achieved in that the device for controlling apparaom magnetic recording solsrzhaschee goal 81,928 ki recording n vospronzvelenn informatsisadnyh n upravlyyshyh signals formirvatel coupled to the output of the head to playback control yuShyh signals and blo offices first vkod associated with tape transport zhnym mechanism (entered first in the driver code, the first trigger, the one-shot, the inverter, the match element, the first block of the delay, the second trigger and the second block of the delay connected to the input b control loca- tion, the second output is connected to the controllable input of the first delay unit, while the direct and the inverse are in the KTDB1ApPrToTo Trigger unit, the unit and the second trigger element respectively. The drawing shows the structure of the device circuitry. The device contains magnetic tape 1, reversible tape mechanism 2, magnetic tin 3 and 4 recording and reproducing 5 and 6, conjugated with; moving magnetic tape 1 n connected; switched through their switches 7 and 8 to the recording amplifier 9 and the amplifier Yu to b Started and, respectively. Magnetic head 6; reproducing the signal from the track, at the ends of which the marks of the beginning of the reverse are recorded; besides, it is connected through the shaper 11 of the reproduction signal to the counting input three heres 12. The inverse output of the trigger 12 is connected to the input of the second trigger 13, and the right code is connected One of the elements of the match is And 14 indiscriminately, via the same vibrator 15 and the inverter 16. The output of the Element And 14 is connected via a block 17 of the switch to the setup input of the trigger 13. Its output is connected through the second block 18 of the delay and 19 of the UP) ё By the sliding mechanism 2 and mutats s 7 and 8 magnitnth heads. On the bus 20; in the one-shot 15, quartz is fed to the pulse sequence; it is necessary to form a single-pulse 5m 15 reference pulse with a stable duration. designed for marking the magnetic tape From an external generator (not shown) bus 21 at the right time feeds a sequence of square pulses with a frequency of the following: exceeding 1.5–2 times Maximum follow frequency pulses of recorded information. This means: „,,, К9 ,, ,,,,, -,. ,,, i, - Kffisss" "4 -" # "“ write records of marker labels on the reverse of this track. From the control unit 19, the bus 22 is commanded by speeds to the one-shot 15 to switch the duration of its imulse into contact with the operation of the device at different transport speeds of the magnetic tape. The bus 23 is designed to set the trigger 13 to its initial state. The number of amplifiers 9 recordings and reproduction amplifiers U, as well as the nonexclusive groups of magnetic heads and magnetic playback heads can be arbitrary. In the proposed structural scheme, all recording heads are switched with one recording amplifier 9, and all reproduction heads with one amplifier 10 for reproducing information. The device works as follows.,. The pulses reproduced by the magnetic head 6 from the output of the amplifier-former 11 are fed to the counting input of the trigger 12, which changes its duration with the arrival of each pulse. Trigger 12, operating as a frequency divider by two, is designed to increase the accuracy of the f: M1 signal of the beginning of the reverse signal and converts the reproduced pulse sequence into a pulse signal, the distance between the three differential drops of the reproduced pulses at the output of the amplifier –former 11. This allows further comparison of the interval between the intervals of eight and five pulses, and their duration, which is subject to the influence of kshogih and Jsvd e (D I have a reproduction signal from the positive image of each program, which is taken from the direct output of the trigger 12, which triggers the pulse generator 15, which output pulse of the polarity with a calibrated duration, runs on the output pulse of the polarity with a calibrated duration, the pulse, the output pulse of the polarity with the calibrated duration, the pulse on the output of the pulse polarity with the calibrated duration. the one-shot pulse is set to a shorter period of a continuous sequence of pulses produced from a portion of the marker ki for a certain .velichinu (e.g. 1O9o) required for reliable overlap entirely mrzhnos rtklo enny dliTel578 nostn reproducible period service signal from its nominal value, thereby providing kadensnogo capture label. When reproducing the tag signal, the duration of positive pulses at the forward output of the trigger 12 and, therefore, at the second input of the element 14 will be longer than the duration of the etalon (the single-vibrator pulse. permitting potential for trigger. In this case, trigger 13 is knocked back from the very first positive edge of the pulse signal arriving at its input C from the inverse output of trigger 12. LOWING. with high potential at the direct output of the trigger 13 will arrive with a delay, through a delay unit 18, into the control unit 19, which by this signal will turn on the reverse of the tape drive mechanism 2 and the corresponding switching of the magnetic heads 3 to 6. The delay circuit 18 is designed to eliminate the appearance of the control signal 6 the beginning of the reverse, which will be generated by the trigger 13 in those cases when a random, single pulse period of the signal at the output of the playback amplifier 11 is compared with the reference interval. the magnetic head 6 of information recorded on the same one where the marker marks are written, the duration of positive pulses at the direct output of the trigger 12 will always be obviously greater than the duration of the reference pulse. At the same time, the output of the element 14 will form a positive-polarity impulse, the leading front of which appears on the rear 4chs of a negative reference impulse and the rear edge on the trailing edge of the positive output impulse of the trigger 12. The impulse from the output of the element 14 arrives from a certain delay, determined by the block 17 of the delay, on the installation input R of the trigger 13 and sets it to its original position. In addition, since this pulse is delayed, including its trailing edge, relative to the positive fronts of the pulsed signal coming from the inverse output of the trigger 12 to the input C of the trigger 13, it blocks the trigger during the appearance of the positive, triggering fronts on its the input C. This eliminates the triggering of the trigger 13 when the duration of the minimum pulse period, reproduced by the magnetic head 6, is longer than the reference interval, which always takes place in the sections where the track is produced is information. In the proposed device, the exclusion of an untimely start of the reverse of the magnetic tape means a guaranteed ability to record information along the entire length of each track, while recording information for a long time by recording it along all tracks under conditions of multiple reversing of the magnetic tape. Claims An apparatus for controlling a magnetic recording apparatus, comprising recording and reproducing heads of information and control signals, a driver connected to the output of the control signal reproducing head and a control unit, the first output of which is associated with a tape drive mechanism, characterized in that In order to improve the reliability of the device, the first trigger, the one-shot, the inverter, the coincidence element, the first block of the delay , The second and the second delay unit connected to the input of the control unit, the second output of which is coupled to the controllable input of said first delay unit, wherein the forward and inverse outputs of the first flip-flop are respectively connected to second inputs of the coincidence and the second trigger element. Sources of information taken into account in the examination 1.Avtsfskoe certificate of the USSR No. 336692, cl. GI 11 B 15 / 18,11.06.70. 2. Japanese patent number 50-238ОЗ, cl. 1O2E-212, published. 11.OS.75 (prototype).