SU1290407A1 - Method of multichannel recording-reproducing of information signals - Google Patents

Abstract

The invention relates to magnetic recording-reproducing systems, in information recording systems, and allows for an increase in information capacity. The sync pulses of a digital bit parallel signal change according to the change in the amplitude of the recorded analog signal. Information pulses from the digital information source 4 are fed to the input of an n-bit digital modulator 5, from the outputs of which the n-bit parallel recording signal through the n-channel recording amplifier 6 goes to block 7 of magnetic recording-playback heads. At reproduction, the p-bit parallel digital signal from the block of 7 magnetic heads is fed to the amplifier 8 of reproduction. From the outputs of the playback amplifier 8, the pulse signals are fed in succession to the element OR 10, delay circuit II, driver 12 clock pulses, where parallel frequency-modulated rows of n-bit digital signals are equalized and the frequency-modulated clock reproduces (siv). From the output of the imaging unit 12, the SIV is fed to the receiver 9 of digital information and through the frequency demodulator 13 and the low-pass filter 14 to the output amplifier 15, where the analog signal is amplified and amplified, which is then fed to the analog information receiver 16. 2 Il. I (L QO IfJUf I

Description

112

The invention relates to instrumentation, in particular to magnetic recording-reproduction systems, and can be used in magnetic information recording equipment in information recording systems and in computing.

The purpose of the invention is to increase the information capacity by recording

additionally an analog signal at the output modulator 3 (Fig. 2b), a parallel parallel digital signal at the output of recording amplifier 6 (Fig. 2), a pulse signal at the output of playback amplifier 8 15 (Fig. 2t), p-bit the digital signal at the output of the generator 12 sync pulse playback (Fig.23 and a sinusoidal signal at the input of the receiver 16 analog information

increase the number of tracks recorded-td.

FIG. 1 shows a block diagram of a device implementing the proposed method of recording and reproducing information signals; FIG. 2 shows timing charts of signals for recording and playback. Multichannel digital recording-reproduction of the speed of the ecd as follows.

Digital recording channels are supplied with a n-bit parallel digital signal and a write clock (PPE), the frequency of which varies according to the amplitude of the recorded analog signal. The PPE on the magnetic tape is not recorded, but in accordance with the frequency modulation of the recording clock, the frequency of the parallel digital n-bit lines recorded on the tape is modulated.

When reproducing, after temporal alignment, parallel frequency-modulated strings of the n-bit signal, the frequency modulated sync pulses are generated by summing the signals of all n bits of each line, then the analog signal is extracted from the frequency modulated sync pulses and a digital signal is generated from the reproduced signal bit parallel signal.

A device that implements the proposed method (in one of the variants) contains (FIG. 1) serially connected analog information source 1, input amplifier 2, frequency modulator 3, digital information source 4, digital modulator 5, p-bit (for example, 9-bit recording amplifier 6, a block of 7 recording-playback magnetic heads, a n-times solid playback amplifier 8, a receiver 9 of digital information. Amplifier 8 is connected via an element OR 10, a delay element J, a driver of 12 line clock pulses, a frequency demodulator 13, a filter of lower frequencies, an output amplifier 15 to an analog information receiver 16. The output of the element OR 10 is connected to the input of the receiver 9 digital -information.

On time diagrams (Fig.2), the signals at the output of the source 1 of the analog signal (Fig. 2a) are shown,

0

five

0

a parallel parallel digital signal at the output of the write amplifier 6 (Fig. 2), a pulse signal at the output of the playback amplifier 8 5 (Fig. 2t), an n-bit digital signal at the output of the playback synchronizer 12 (Fig. 23) and sinusoidal signal at the input of the receiver 16 analog information

(Fig. 2e).

The device works as follows.

in a way.

From source 1, an analog signal goes to amplifier 2, the output voltage of which, when there is no signal, determines the average carrier frequency of modulator 3. At the output of modulator 3, there is an isolation circuit that normalizes the amplitude of the input signals to power the logic circuits. The signal from the modulator output is fed to the synchronization input of digital recording channels of the information source 4. In this way,

5, the frequency of the write clock (PPE) of a digital n-bit parallel signal varies in accordance with the amplitude of the recorded analog signal. Information pulses from source 4 are fed to the input of an n-bit digital modulator 5 made, for example, on the basis of counting flip-flops (for recording without returning to zero). From the outputs of the flip-flops, the n-bit parallel recording signal through the n-channel recording amplifier 6 is fed to the block 7 of the magnetic recording-output heads. When playing

A 0 p-bit parallel digital signal from the head unit 7 is fed to a reproduction amplifier 8, consisting of a half-wave limiter, a driver, and a trigger (not shown).

5 amp outputs 8 pulses

the signals are received successively on the element 10 1SHI, the element 1I of the delay, the driver I2 of the clock pulses of the lines where the alignment

parallel frequency-modulated rows of signals of an n-bit digital signal and the formation of frequency-modulated clock pulses (SIV). From the output of the imaging unit 12, the SIV is fed to the receiver 9 of digital information and through the frequency demodulator 13 and the low-pass filter 14 to the output amplifier 15, where the selection and amplification of the analog signal then to the analog information receiver 16 occurs.

Claims (1)

Invention Formula A method of multichannel magnetic recording-reproducing information signals, in which signals of recording digital information are formed in the form of n-bit parallel lines, each of which contains 5 j II POR p-PP OPP Compiler A.Lukanin Editor To Voloshchuk Tehred c. Kadar Proofreader A.Ilyin Order 7909/51 Circulation 611 Subscription BNIISH State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing company, Uzhgorod, st. Project, 4 o five 0 at least one signal corresponding to the information symbol 1, characterized in that, in order to increase the information capacity by recording an additional analog signal without increasing the number of recording tracks, the analog signal of the period of the signal following parallel lines of digital information is modulated during recording , and during playback, time alignment of the digital information signals of each line is carried out, the line sync signal is formed by summing the signals of all n bits in this line, and the analog signal is produced vschelenie m frequency demodulation timing sequence of parallel rows of digital information.