SU1068985A1 - Device for magnetic recording/reproducing of pulse signals - Google Patents

Abstract

A MAGNETIC RECORDING-REPRODUCTION DEVICE OF PULSE SIGNALS, containing a recording unit with a magnetic head, the first trigger, the input and output information buses, the first counter, the counting input connected to the output of the pulse generator, and the second counter, o. so that, in order to increase recording density and noise during playback, a second trigger, a comparator, the first and second one-vibrators, the bipolar pulse former, the first and second operation mode switches, the element are introduced into it. delays, multiplexer, output clock bus and sampling bus connected to the gate input of the multiplex plexor, while the output of the magnetic head through the normally connected normally closed contact of the first switch, comparator, normally The second contact of the second switch and the second one-shot are connected to the reset input of the first counter, to the counting input of the second counter and to the clock inputs of the first and second triggers, the information inputs of which are connected respectively to the input bus and through the delay element to the third discharge of the first counter, I a the outputs are from the control input (L of the multiplexer and with the output information bus, respectively; high: the second and third bits of the first counter are connected to the second and third, and form insulating multiplexer inputs, the output of which is connected to the normally open contact of the second switch and through the bipolar pulse generator - a first normally open contact breakers operation. ace: from 00 SP

Description

The invention relates to instrumentation, in particular, to the registration of information with a movable magnetic carrier, and can be used in experimental automation techniques as a recorder of logical (discrete) information on a magnetic tape. A device for magnetic recording of discrete signals is known, which contains a pulse shaper and a series-connected frequency modulator, a recording unit, a limiting amplifier and a shaper connected to AND and OR circuits, and a common trigger connected to their outputs, while the delay circuit is connected between the limiting amplifier and A pulse generator whose outputs are connected to the OR circuits via the AND Cl circuits. V However, this device has a rather complicated circuit; in addition, it does not provide high noise immunity when the recording density is increased. The closest to the proposed technical entity is a device for magnetic recording and reproduction, containing a recording-reproducing unit connected in a certain way, to transform. code, buffer memory block, AND element, OR element, trigger, pulse edge selector, initial setup block, comparison block, pulse generator, measuring counter, controlled counter, word clock counter and block are marked with marker 21. Although the known device provides reduction of recording-reproduction error, however, also has a low-level noise immunity when playing back information. The aim of the invention is to increase recording density and noise immunity during reproduction. . The goal is achieved by the fact that a magnetic recording-reproducing device of pulse signals containing a reproducing unit with a magnetic head, a first trigger, input and output buses, a first counter, a counting input connected to the output of the pulse generator, and a second counter are entered a second trigger comparator , first and second one-shot, shaper of bipolar pulses, first and second operation mode switches, delay element, output clock and gate bus, connected to the gate input In this case, the output of the magnetic head through the serially connected normally closed contact of the first switch, the comparator, the normally closed contact of the second switch and the second one-vibrator is connected to the reset input of the first counter, to the counting input of the second counter and to the clock inputs of the first and second triggers, information inputs which are connected respectively to the input bus and through the delay element to the output of the third discharge of the first counter, and the outputs to the control input e multi. The exora and with the output data bus, respectively, the outputs of the second and third bits of the first counter are connected respectively to the second and third information inputs of the multiplexer, the output of which is connected to the normally open contact of the second switch and to the normally open contact of the first mode switch work. 1 shows diagrams of signals; figure 2 - structural diagram of the device. The device input bus 1 is connected to the information input of the first trigger 2, the output of the magnetic head 3 is connected to the first input of the recording-playback unit 4, whose information output is connected to the information input of the second trigger 5, the inverse output of which is the information output of the device (output information bus 6 ), the first clock output 0 of block 4 is connected to the counting inputs of both triggers 2, and 5, the outputs of the second counter 7 are counting outputs of the device (bus 8), the second clock output of block 4 is connected to first monostable course 9, the output of which is a clock output of the apparatus (the output clock bus 10), wherein the recording-reproduction unit includes switches 11 and 12, the operation mode. The changeover contact of the first switch 11 is connected to the first one. The unit of recording-reproducing unit 4, its normally closed contact, is connected to the input of comparator 13 ,. normally open contact with the output of the imager 14 bipolar pulses, the changeover contact of the second switch 12 is connected to the input of the second one-oscillator 15, its normally closed contact with the output of the comparator 13, and its normally open contact with the input of the imager 14 bipolar pulses and the output of the multiplexer 16, the control input of which is connected to the output of the first trigger. The output of the one-shot 15 is connected to the input

reset the first counter 17, the counting input of which is connected to the output of the pulse generator 18, the second discharge of the counter 17 is connected to the second information input of the multiplexer 16, and the output of the third discharge of the counter 17 is connected to the third information input of the multiplexer 16 and through the delay element 19 to the information the output of block 4 recording playback. A gate bus 20 is connected to the gate of the multiplexer 16. A bus with zero is connected to all free inputs of multiplex 16.

ABOUT

(figure 1

potential

diagrams correspond to the numbers of the corresponding blocks at their output). : The device when recording works as follows. ; The input signal from bus 1 is inserted into trigger 2, from which it is fed to the control input of multiplexer 16, which selects the signal from the third discharge of counter 17. if there is a signal at its control input (the division ratio of the counter is three); at. in the absence of a control signal, selects the output, the second bit of this counter, and this determines the change in the interval interval. registration of discrete information with a ratio of 1: 1.5 intervals when the encoded signal is 1/2 T.

The shaper 14 bipolar pulses generates positive and negative impulses of recording on both fronts of the width-coded signal. Synchronization is performed on the basis of the width-encoded signal.

When playing a signal with a magician {string of a head, it is amplified and compared. Generator frequency during playback

r, jr t

In the image, it is equal to 5/6 of the frequency during recording, which allows increasing the reliability of decoding the reproduced signal. When decoding a signal recorded with a period

5, 1.5 T, at the output of the third bit of the counter 17, a signal appears which, via delay element 19, is inserted into the second trigger 5. Decoding is performed with self-synchronization on the decay of the reproduced and compressed signal. The output clock bus 10 devices are pulses generated on the front of the front 5 signal. During registration, the beginning (leading edge) of the logical signal is delayed relative to the real signal by an interval, and the trailing edge is (i), which is not significant when counting the number of events.

As a base object, select-. Min-accumulator on a magnetic tape (mini-NML) of type EC-5091 with a recording density of up to 32 bit / km with a maximum recording speed of up to 4 kbit / s. The proposed device makes it possible to record information with a density of about 200 blt / mm at a recording rate of more than

20 kbps 0

The device can be widely used in the automation of both laboratory and industrial experiments, in particular in the design and diagnosis of discrete

systems of regulation and control, various discrete sensors, as well as the registration of various co. Being that allows not only to count these events, but also to determine their distribution during the time during the magical processing of the reproduced information.

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Claims (1)

DEVICE FOR MAGNETIC RECORDING-PLAYBACK OF PULSE SIGNALS, containing a recording unit with a magnetic head, a first trigger, input and output; an information bus, a first counter connected to the output of the pulse generator by a counting input, and a second counter that is connected to that, in order to increase the recording density and noise immunity] during playback, a second trigger, a comparator, first and second single vibrators, a shaper of bipolar pulses, the first and second switches of the operating mode are introduced into it, a delay element, a multiplexer, an output clock bus and a gating bus connected to the gating input of a mult ”plexor, while the output of the magnetic head is connected through the normally closed contact of the first switch, a comparator, the normally closed contact of the second switch and the second one-shot are connected to the reset input of the first counter, to the counting input of the second counter and to the clock inputs of the first and second triggers, the information inputs of which are connected respectively to the input bus and through the delay element is with the output of the third bit of the first counter, and the outputs with the control input of the multiplexer and with the output information bus, respectively, the outputs of the second and third bits of the first counter are connected respectively to the second and third information inputs of the multiplexer, the output of which is connected to the normally open contact of the second switch and Through a bipolar pulse shaper - with a normally open contact of the first operating mode switch.