SU1744712A1 - Device for digital information magnetic recording - Google Patents

Abstract

The invention relates to instrumentation, namely, magnetic recording equipment. The purpose of the invention is to increase the recording density. To do this, a device for magnetic recording of three-interval signals, containing a pulse generator 1, a counter 2 and a multiplexer 3, sequentially connected shift register 7, a trigger 9, three elements EXCLUSIVE OR 11-13 and the element OR 14, are entered as well as the driver 10, connected between the register 7 and the trigger 9, while the information input of the device is connected to the input of the trigger 9, and information elements of the multiplexer 3 are connected to the EXCLUSIVE OR elements and the OR element. 3 Il.

Description

The invention relates to instrumentation, in particular to a technique of magnetic recording, and can be used in the equipment for recording and accumulating information from measuring and computing systems.

The purpose of the invention is to increase the recording density.

FIG. 1 shows a block diagram of the device; in fig. 2 shows the formation of intermediate signals; in FIG. 3, the recording signals.

The device contains a pulse generator 1, a counter 2, a multiplexer 3 connected through a shaper 4 bipolar pulses to an output data bus 5, the output clock 6 is connected to the fourth output of counter 2 and the clock input 7 of the shift, the information input of which is connected to the input information bus 8. Register 7 outputs are connected via trigger 9 and driver 10, as well as through the first 11, second 12 and third 13 elements EXCLUSIVE OR and element OR 14 with the corresponding inputs of multiplexer 3, a; j.3CHbie whose inputs connected to the corresponding outputs of the counter bits

The recording is made with short rectangular pulses of alternating polarity. A time interval of 1T duration is formed by a single write pulse through 0.5T from the beginning of the interval. The time interval 21 is three pulses through 0.5T, 1, ST and 1.7T from the beginning of the interval, the ST interval is six pulses through 0.4T, 0.9G, 1, 3T, 1.9T, 2.4T and 2.8T . In the 1T interval, a pulse is formed through 0.6T from the beginning of the interval, if this interval follows the ST interval and before the 1T or 2T interval. The first impulse of the ST interval is set after 0, the ST from the beginning of the interval, if this interval follows the interval of 1T or 2T.

The device works as follows.

Counter 2 (six-bit) operates in the pulse counting mode of oscillator 1. Clock signal A via bus 6 is fed to the clock input of register 7 and to an information source (not shown), In register 7, the three-interval signal is delayed by four clock cycles, and from the outputs register 7 signals are triggered by trigger 9 by pulses C generated on the edges of signal B, multiplexer 3 generates a pulse sequence (signal D) depending on

control signals X1, X2, HZ and address signals AO-A5 from counter 2.

The signals recorded on the carrier in the form of a bundle of three pulses alternating

polarities have a duration of 1.5T and 2T. The reproduced signal is three-interval with a duration of intervals between zero transitions 1T, 1.5T and 2T. The initial information signal B with the duration of the ST during playback corresponds to two intervals of 1.5T each (signal I in FIG. 3). This signal has self-synchronization and a detection window of ± 0.25T.

Claims (1)

Claims An apparatus for magnetic recording of digital information, comprising a generator pulses, the output of which is connected to the counting input of the counter, the outputs of the bits of which are connected to the corresponding address inputs of the multiplexer, the output of which is connected through the driver bipolar pulses to the output data bus, the shift register, the clock input of which is connected to the output of the fourth digit of the counter and the output clock bus, and the information input - with an input information bus, characterized in that, in order to increase the recording density, a trigger, a driver, three EXCLUSIVE OR elements and an OR element are introduced into it, the outputs of two additional bits of the counter are connected to the corresponding two additional address inputs of the multiplexer, the first to the fourth outputs of the shift register are connected to the corresponding four trigger inputs, the clock input of which is connected to the fifth output of the shift register through the driver, the inputs of the first element EXCLUSIVE OR are connected to the first, second and third outputs of the trigger, the inputs of the second element EXCLUSIVE OR - to the second, third and fourth outputs of the trigger, the inputs of the third element EXCLUSIVE OR to the third and fourth outputs of the trigger, the inverse outputs of the first and second elements EXCLUSIVE OR and the fifth input of triggers element OR with the first input of the multiplexer, the second input of which is connected to the inverse output of the third element EXCLUSIVE OR, and the third input to the p output of the trigger, A1 AZ t Ј Ya J