SU1434491A1 - Magnetic recording and playback system - Google Patents

Abstract

The invention relates to a technique for recording information on a movable medium and can be used in instrument making for creating magnetic recorders of digital information. The purpose of the invention is to increase the maximum frequency of the recorded information is achieved by the introduction of two registers 9 and 10 connected in a certain way, a reference frequency generator 11, a generator 12 controlled by a voltage, two impulse drivers 13 and 14, two elements of one-shot 15-18 Both 19 and 20, an integrating amplifier 21, a trigger 22 connected between an EXCLUSIVE OR element 7 and an output bus 8 connected in series with the phase detector 23 and the second generator 24 controlled by voltage. 2 Il.

Description

U

W

eight

before

| i

X)

FIG. one

The invention relates to a technique for recording information on a movable medium and can be used in instrument making for creating magnetic recorders of digital information.

The purpose of the invention is to pick up the maximum frequency of the recorded information. Fig. 1 is a block diagram of a magnetic recording and playback device; figure 2 - timing charts, according to the yusre operation of the device.

The magnetic recorder and playback device contains two channels 1 and 2 of recording-playback, input bus 3 connected through the first trigger 4 with the input of the first recording-playback channel 1 and through sequentially connected element HE 5 and the second trigger 6 with the second recording channel 2 and playback, as well as the item EXCLUSIVE OR 7 and the output bus 8, the first 9 and second 10 registers, the first inputs of which are connected respectively to the outputs of the first 1 and second 2 recording and playback channels, the reference frequency generator 11, high frequency with the second input of the first register 9, the first generator 12, controlled by voltage, two pulse shapers 13 and 14, four one-shot 15-18, two elements And 19 and 20, integrating amplifier 21, third trigger 22, connected between the output element IS-7 and 7 output bus 8, phase detector 23 and second generator 24 connected in series, controlled by voltage, output connected to VTORO

the input of the third trigger 22 and to the first input of the phase detector 23, the second input connected to the output of the EXCLUSIVE OR element 7, while the output of the first register 9 is connected to the first input of the EXCLUSIVE OR element and through the serially connected first driver 13 pulses, the first one-shot 15, the first element Both 19 and the second one-shot 16 with a nepBM “i input of the integrating amplifier 21, the second input of which is connected via a third one-shot 17 connected in series, the second element AND 20, the fourth single-vibrator 18, the second form worldlord 14 pulses, second shift register 10

and a generator 12, controlled by voltage, to the output of the integrating amplifier 215, the output of the first trigger 4 is connected to the second input of the second trigger 6, the outputs of the first and second driver 13 and 14 are connected respectively to the second inputs of the first and second elements And 19 and 20. The second

0 and the third trigger are executed in the form of D-triggers.

The magnetic recording and reproducing apparatus operates as follows.

5 The input code signal from the input bus 3 (Fig.2.1), having a certain set of intervals between the voltage drops of the pulses, passes the counting trigger 4, is converted into a signal (Fig.2.2) with a reduced frequency of 2 times and is recorded in the first channel 1. At the clock input of the D-flip-flop 6, the input signal is fed through the NOT 5 element, so the signal appears at the output of the flip-flop (Fig. 2.3) 5, which is the state of the signal recorded in the D-flip-flop 6 at the instants of the drops pulses. This signal comes

0 to write to the second channel 2. During playback, inter-channel offsets are possible, to eliminate the reproduced signals being fed to the shift registers 9 and 10, where the subject is}

0

five

0

five

are delayed. In register 9 signal

is delayed for a constant time, which should be longer than the maximum possible inter-channel shift in order to be able, by changing the delay in register 10, to select any inter-channel shift with any sign. If the inter-channel shift does not exceed the time T, then choosing the delay time of register 9 equal to 2 Tj., You can choose any advance or lag of the signal of the second track relative to the first one, changing the frequency of the first generator 12 not more than 2 times to one side or the other from the average .

The formation of the signal that controls the frequency of the oscillator 12 is the following i. The signal (Fig, 2.4) from the output of the register 9 is fed to the first driver, which generates short pulses, on each front of the reproduced signal. These pulses trigger a one-shot 15, generating pulses with a duration (Fig. 2.6). The playback signal of the second channel after register 10 triggers the second driver 14, the pulses of which (Fig. 2.8) trigger the one-shot 18 for the duration T c (Fig. 2.9). If this signal is ahead of the signal from the register 9 output, then a part of the pulses enters the inter-Q shafts T ;, the signal from the signal and through the ananeHt AND 19 starts the one-shot 16. If the signal from the register 10 output lags the signal from the register 9, then the pulses from the output of the form; the actuator 13 coincides with the signal from the output of the one-shot 4 through the element 20 and starts the one-shot 17. The pulses from the output of the one-shot 16 pass into the integrating amplifier 21 and cause an increase in the signal at its output, the pulses from the output of the one-shot 17 drive t to decrease output an integrated amplifier 21. This signal through the generator 12 controls the delay of the signal in register 10 and minimizes the inter-channel time shifts. The element EXCLUSIVE OR 7 forms a sequence of pulses close to the original sequence. The difference between these signals is that the edges of the pulses of the reproduced signal are subject to temporal fluctuations. To bring this signal to full similarity with the input, using a phase detector 23 and the second oscillator 24, controlled by voltage, a signal is generated with a period of 2 times less (Fig. 14.14), than the minimal index of the input signal, is clocked by the positive edges of the received D-flip-flop signal 22, the input of which is a signal from the output of the EXCLUSIVE OR element.

35

45

Claims (1)

Invention Formula A magnetic recording and playback device containing two recording-playback channels, an input bus connected via the first 0 5 0 0 five five 0 Hero: to the input of the first recording-playback channel and through the series-connected element NOT and the second trigger to the input of the second recording-playback channel, as well as the EXCLUSIVE OR element and the output imiHy, characterized in that, in order to increase the maximum frequency of the recorded information, it is entered the first and second registers, the first inputs of which are connected respectively to the outputs of the first and second recording and playback channels, the reference frequency generator output connected to the second input of the first register, the first generator a voltage controlled torus, two pulse drivers, four single-oscillators, two AND elements, an integrating amplifier, a third trigger connected between the output of the EXCLUSIVE OR element and the output bus, a series-connected phase detector and a second generator controlled by voltage, output connected to the second input of the third trigger and to the first input of the phase detector, the second input of the EXCLUSIVE OR element connected to the output, while the second and third triggers are made in the form of a D-trigger the output of the first register connected to the first input of the element SKIPPYAKEYE OR, and through serially connected the first pulse shaper, the first one-shot, the first element I and the second one-shot one to the first input of the integrating amplifier, the second input of which is connected through the series-connected third one-shot, the second element And, the fourth one-shot, the second one pulses, the second shift register and the first oscillator controlled by the voltage, and the output of the integrating amplifier, the output of the first trigger is connected to the second input the second trigger, the outputs of the first and second drivers are connected respectively to the second inputs of the first and second elements I. TfiUH 2TfiUH