SU1448359A1 - Apparatus for magnetic recording of digital information - Google Patents

Abstract

The invention relates to a magnetic recording technique, allows an increase in the recording density and can be used in recording and storing information equipment. The device contains a pulse generator 1, connected to counter 2, the bit outputs of which are connected to the control inputs of the multiplexer 3. The output clock bus 4 is connected to the output of the third digit of the counter, and the input information bus 1 is connected to the fourth information input of the multiplexer, to the first, to the third, fifth, seventh and eighth inputs of which a zero potential bus is connected, a single potential bus is connected to the second and fourth inputs 15 multi-. plexer, the output signal of the multiplexer through the counting trigger 6 and the driver 7 bi-pulse signals fed to the magnetic head 8 for recording on magnetic media. Performing the above communications of the control and information inputs of multiplexer 3 ensures that the device generates three pulses with transmitting polarity when recording 1 and two pulses when recording O, which, with an appropriate choice of the duration of the clock interval T, ensures the formation of a two-interval reproduction signal and reduction of intersymbol distortions due to which increases the recording density. 2 Il. i (L 4 4i 00 WITH SP; o

Description

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The invention relates to instrument making, namely to magnetic recording technology, and can be used in recording and accumulating equipment of 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 - time diagrams that show his work.

The device contains a generator 1 Impedov, connected to the counting input of counter 2, the outputs of the first, second and third bits of which are connected to the corresponding control inputs of the multiplex 3, the third discharge of counter 2 is also connected to the output clock 4. The input information bus 5 is connected with the fourth information input of the multiplexer 3, the first, the third, the fifth, the seventh and the eighth information inputs of which are connected to the DiHHa of zero potential, and the bus and the sixth inputs of the potential potential bus. Multiplesor output through a counting trigger 6 is connected to a shaper of 7 bipolar pulses loaded on a magnetic head 8.

The device works as follows

at once.

Counter 2, operating from generator 1 in the mode of counting its pulses, generates, at the outputs of the bits, signals (Fig. 2B, 2B and 2G) controlling the operation of the multiplexer, as well as a clock signal (Fig. 2G) with a clock cycle IT, posting to the source of information (not shown) on the tact bus 4.,

Depending on the input information signals (Fig. 2A), incoming via the input information bus, and control signals (2B, 2B and 2G), the multiplexer 3 (performed according to the scheme 8-1) forms the output signal (Fig. 2E), arriving at the counting trigger 6, on the fronts of the output signal (Fig. 2I) of which the driver 7 bi-pulse signals generates

rotary rectangular pulses of alternating polarity (Fig. 2K), fed to the magnetic head 8 for recording on a carrier (not shown).

,

5 0 5 0

five

. five

0

five

Multiplexer 3 with those indicated in FIG. 1 sW x generates three pulses in a clock interval through 1 / 4Т, 1 / 2Т and 3 / 4Т from its beginning with an input information signal 1, and two pulses through 1 / 4Т and 3 / 4Т - at an input signal O. Clock the recording signal period T is chosen from the condition T 2Gy at T (1.5-1.7) cG / Y, where V is the speed of movement of the magnetic recording carrier; f is the equivalent working gap of the magnetic head.

The device provides the ability to record without demagnetizing the carrier, i.e. on non-erased, previously recorded signal-gram.

The third additional pulse recorded in the middle of the clock interval of the recording signal information 1, formed by the proposed device at a distance of 1 / 4T from adjacent pulses, for the above conditions (T 2T ") performs the function of high-frequency bias and reduces intersymbol distortions, which allows increase the recording density.

The reproduction signal for this method (Fig. 2L) is two-interval and in form coincides with the signals of the known two-interval methods (frequency-coded) or FM (phase-coded), therefore, the deco-. The synchronization signals used in the proposed method can be carried out and known to FM or FM recording devices.

Fore, Mula Invention

A device for magnetic recording of digital information, comprising a pulse generator connected to the counter input of the counter, an input information bus, a multiplexer, a trigger, a bipolar pulse former associated with the magnetic head, and an output clock bus that is that, in order to increase the recording density, the outputs of the first, second and third bits of the counter are connected to the corresponding control inputs of the multiplexer, to the first, third, fifth, seventh and eighth information inputs of which bus potential of zero potential is connected to the second 31448359

The first and sixth inputs are connected to the single input of the bi-potential generator, and to the fourth input are lary pulses, and the output clock-input information bus, the output of each bus is connected to the output of the third multiplexer via a counter trigger digit of the counter .

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Editor N. Gorvat

Compiled by A. Lukanin Tehred L. Oliynyk

Order 6849/54

Circulation 590

VNIIPI State Committee for Inventions and Discoveries at the State Committee for Science and Technology of the USSR 4/5, Moscow, Zh-35, Raushsk nab. 113035

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Corrector I. Muska

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Claims (1)

Claim A device for magnetic recording of digital information containing a pulse generator connected to the counter input of the counter, an input information bus, a multiplexer, a trigger, a bipolar pulse shaper connected to a magnetic head, and also an output clock bus, which differs in that ~ In order to increase the recording density, the outputs of the first, second, and third bits of the counter are connected to the corresponding control inputs of the multiplexer, to the first, third, fifth, seventh, and eighth information inputs of which lyuchena tire ground potential to vtoro1448359 mu and sixth inputs - the tire building unit, and to fourth input of the input data bus, the output of the multiplexer via a counting trigger associated with the input of the bipolar pulse, and the output clock line is connected to the output of the third · th counter discharge. FIG. 2