SU781907A1 - Method of recording digital information onto magnetic carrier - Google Patents

Description

I

The invention relates to instrument making, namely to a method of magnetic recording of digital information by amplitude modulated signals, and can be applied in the study of processes recorded from many sources of information on magnetic media.

A known method of recording and reproducing digital information Jl.

However, this method does not provide a high recording density.

The closest in technical essence to the prelagible is a method of recording digital information on a magnetic carrier based on the form of clock pulse, modulus on the amplitude of each even pulse of a clock sequence at the level of word signals of digital information 2

In this device, recording of digital information on a tape recorder is accomplished by generating pulses from the back-to-back sequence, modulating the amplitude of the first and second pulses with a signal of the beginning of a word of digital information, sequentially modulating in amplitude k, and even even pulse of the clock sequence with digital information signals. , each odd pulse by a signal of a constant level, recording the modulated signal on a magnetic carrier. When recording information, each digital word signal is recorded with even clock pulses; odd pulses, with the exception of the impulse of the beginning of the word digital information, do not carry any information. The recording time of one character of useful information can be determined by the formula

H., Gt;

but

where T is the clock period.

However, in a number of cases, for example, with ayali, the probability distribution is not; ЙYG Й a - - й th г g 5YYaSh in Й ygy-y-g-: ctauiioftapttbiK of processes there arises the need to process recorded information on a computer and tape layout. The performance of modern computers and practical values of clock frequencies when recording information on magnetic tape Tyj determines the recording rate of information in computers, i.e. the recording density determines the thickness of the magnetic carrier, n6 and the efficiency of information processing. The purpose of the invention is to increase the information recording density. ; The goal is achieved by the fact that successively in time of the time of the 1 st (1 st time for each pulse and: each odd pulse of the clock sequence by the signals of the recorded digital information, each signal of the word of the recorded digital information is divided into two separate random parts, the clock pulses the sequences are inverted and modulated in amplitude each pulse of the inverted clock sequence sequentially in time, first by the signals of the first part of the word recorded digital InforkAt-Cyy, then the inverted signals of the second part of the word to be recorded, subtract the second, modulated sequence from the first modulated sequence, and the Signal signal from the magnetic carrier .The drawing shows a functional diagram of the recording method implementation, the digital information. The device contains a generator of 1 gA. Tb11x1xmT1ulsovG whose output connects 1SH of its own input of the amplitude modulator 2 directly and the input of the modulator 3 through the HE inverter 4, control input of modulator 2; connected to bus 5 of digital information directly STV-11; 11 control device VHS 8M M 3 through element 6 Exclusive OR; whose input is connected to control bus 7, outputs of modulators 2; and 3 sbshiyeny with G1 {ymym and inversion input of the adder 8. The device works as follows. . Generator 1 generates the last clock pulse frequency pulse, which is fed to the controlled input of the amplitude modulator 2 directly, and to the input of the modulator 3, inverted by the NOT 4 element. Synchronously with the clock

Claims (2)

781907 after the sequence, the control inputs of the modulators 2 and 3 receive digital information signals via bus 5, the control input of the modulator 2 directly connected to the digital information bus, and the input of the modulator 3 receives information from the output. element 6 Exclusive OR, the first input of which is connected to the bus 5 informational, and the second. - with bus 7 control. The digital information of the word to be recorded is aimed at two arbitrary whole parts (for example, by a counter). When recording the first part of a word of digital information, the control signal on bus 7 is equal to Log, which provides amplitude Modulation of the inverted clock information with a direct digital information signal. When the second part of the word of digital information is recorded, the control signal on bus 7 is equal to the Log, which provides amplitude modulation of the inverted signal of digital information in the inverted way. The output signals of the amplitude modulators are subtracted in the adder 8, and the resulting signal is recorded on a magnetic carrier. The recording time of one character of digital information when implementing the device by the proposed method is equal to the clock sequence: /. . Thus, with the equality of the period of the clock sequence of the device in the proposed method, the recording density doubles. The invention method of recording digital information on magnetic media, based on the form. . worlds of pulses of a clockwise sequence of even an even pulse of a clock sequence of two levels with digital information word signals, which means that in order to increase the information recording density, the pulse and each odd pulse of a clock sequence with words recorded information (information, each signal of a word; recorded digital information is divided in time into two arbitrary whole parts; The spines are inverted and amplitude modulated each pulse of the inverted clock sequence sequentially in time, first with the signals of the first part of the recorded digital information, then with the inverted signals of the second part of the word of the recorded information, the second modulated sequence is subtracted from the first modulated, and the result of the readout is recorded on a magnetic carrier. information taken into account during the examination 1. USSR author's certificate J 4,716 O2, Cl. Q 11 B 5/02, 1975. 2. Copyrights certificate CCCf N 356689, cl. G 11 V 27/30, 1973 (prototype).