SU1064127A1 - Device for detecting skewness of magnetic medium - Google Patents

Abstract

A DEVICE FOR DETECTING A MAGNETIC MEDIA TRANSFER, containing two recording heads, a recording pulse generator connected directly to one of the recording heads and through a delay node to another recording head, and a playback head, characterized in that, in order to increase the efficiency of surface use. These working layers of the magnetic carrier, it is equipped with an amplitude detector, pulse shaper, counter, differential amplifier, three keys, three memory blocks and a decoder, the outputs of which are connected to the control inputs of the keys, when the recording heads are placed opposite and obliquely to one another, the playback head is connected to the input of the amplitude detector, the output of the amplitude detector through the pulse shaper and the counter is connected to the input of the decoder, via the first key and the first memory block - c. the first input of the differential amplifier, through (L the second and second memory block with the second input of the differential amplifier, and the output of the latter through the third key is connected to the third memory block. .2 about: 4 to -vj

Description

The invention relates to a measuring technique and can be used to detect the bias of a magnetic recording medium for information signals. A device for measuring the skew of a moving magnetic carrier / containing two output heads, signal conditioners, and a phase discriminator with a measuring 6lokS1 connected to it is known. The closest in technical essence and the achieved effect to the proposed device is (containing two recording heads, a pulse generator connected directly to one of the recording heads and, through a delay node, to another recording head, and a C23- playback head. device is a decrease in the efficiency of use of the surface of the working layer of the magnetic carrier. The purpose of the invention is to increase the efficiency of use of the surface of the working layer of the magnetic carrier. It is tied by the fact that a device containing two recording heads, a recording pulse generator connected directly to one of the recording heads and through a delay node to the other recording head, and the playback head is equipped with an amplitude detector, pulse shaper, and counters. com, differential amplifier, trema keys, three memory blocks and a decoder, the outputs of which are connected to the control inputs of the keys, while the recording heads are placed opposite and obliquely to one another, the playback head is connected to the input m of the amplitude detector / output of the amplitude detector through the pulse shaper | And the counter is connected to the input of the decoder, through the first key and the first memory block - to the first input of the differential amplifier, through the second key and the second memory block and the output of the latter through the third key is connected to the third memory block. 1, a block diagram of the proposed device is shown; Fig. 2 shows the position of the recording heads with respect to the magnetic carrier; Fig. 3 shows voltage plots for explaining the operation of the device. The device for detecting the skew of magnetic carrier 1 contains recording heads 2 and 3, a generator of 4 recording pulses connected to head 3 directly, and to head 2 through a node 5 of delay. The generator 4 write pulses made in the form of the master node b and the former 7 radio pulses. The delay unit 5 is configured as a delay line 8 and an amplifier 9. The device also includes a playback head 10. The device is equipped with an amplitude detector 11, a first key 12, a first memory block 13, a second key 14, a second memory block 15, a differential amplifier 46., a third key 17, a third memory block 18, a decoder 19, a driver 20 and a counter 21. Heads 2 and 3 of the recording are placed opposite and obliquely one to another (Fig. 2) with the ability to record signals on one track, but on opposite sides of carrier 1, and the magnetic imprint of the signal of each of the heads in the absence of carrier 1 is recorded under one same angle to the direction NIJ movement carrier 1. The plane of the working reproduction head gap 10 is perpendicular to the direction of movement of carrier 1, has other similar head 22 intended for zapisivosproizvedeni signals from the tracks 23 of the magnetic carrier 1. The apparatus operates as follows. The pulse signal of the generator 4 in the form of a radio pulse is fed to the recording head 3 and, with some delay, to the recording head 2. Magnetic fingerprints of signals are applied to track 24. When track 24 is played by head 10, two radio pulses spaced apart in time are formed at the output of the latter. When there is no skew, the reproduced Hue pulses are equal in amplitude. When the magnetic carrier 1 is skewed, the amplitude of one pulse increases, and the other one decreases I (Fig. 3 a). The amplitude detector 11 highlights the envelope (Fig. 35) of the reproduced radio pulses. By the amplitude gradients of the bending curve, the shaper 20 extracts the clock signals (Fig. 3 &) which are fed to the input of the counter 21. In accordance with the state of the counter 21 by the decoder 19, key pulses are formed (Fig. 3 d, d for controlling the keys 12 and 14 In accordance with the key pulses, the amplitude value of one of the radio pulses is stored in the first memory block 13, and the amplitude value of the other is stored in the second memory block 15 (Fig. 3c). The difference signal of the amplitudes is obtained at the output of the differential amplifier 16 and through key 17 and the memory unit 18 is supplied to the device output 25 as a skew detection signal. The key 17 is for temporarily selecting the established

parts of the output of the differential amplifier 16.

The proposed device makes it possible to increase the efficiency of using the surface of the working layer of a magnetic carrier by recording measurement signals from two opposite sides of the carrier base on one track.

1 g J

2J

but

/ And

".G

9

Well

- t

 t

Claims (1)

A device for detecting a skew of a magnetic medium containing two recording heads, a recording pulse generator connected directly to one of the recording heads and through the delay node to the other recording head, and a playback head, characterized in that, in order to increase efficiency use of the surface of the working layer of the magnetic carrier * it is equipped with an amplitude detector, pulse shaper, counter, differential amplifier, three keys, three memory blocks and a decoder, the outputs of which are ineny with control input keys, wherein the recording head and are arranged oppositely inclined to one another, the reproducing head is connected to the input of the amplitude detector, the output of the amplitude detector via a pulse shaper and a counter connected to the input of the decoder, through the first switch and πθρ- _β vy memory block - from. the first input © of the differential amplifier, through the second key and the second memory block with the second input of the differential amplifier, and the output of the latter through the third key is connected to the third memory block. SU .. 1064127