SU862198A1 - Device for reproducing digital information from magnetic record carrier - Google Patents

Description

The invention relates to the field of magnetic recording, in particular to devices for reproducing digital information from a magnetic recording medium. A device for reproducing digital information from a magnetic recording medium is known, which comprises a reproduction head connected through a reproduction result converter to the digital information output bus til. The known device has a relatively simple design, but it does not allow the reproduction of digital information recorded with sufficiently high density. Also known is a device for reproducing digital information containing a magnetic reproduction head of a pulsed two-pole phase-manipulated signal connected to the input of a pulse of positive differences, the output of which is connected to the output bus of the sync pulse, and to the input of the pulse detector of negative differences, And, The mentor OR, the trigger, the output bus of the digital information and the output bus of the error signal 2 This device allows the reproduction of digital information recorded with relatively high density. The drawback of the device consists in a considerable error in the result of reproducing digital information from a magnetic recording medium. The purpose of the invention is to reduce the error of the result of the use of digital information from a magnetic recording medium. . & This is achieved by introducing a reversible counter into the device for reproducing digital information from the magnetic recording medium, the output of which is connected to the output bus of digital information, the reset input to the output of the detector of positive pulses, differences, the counting input to the output of the pulse generator, input addition to the forward trigger output connected to the first input of the first element I, and the subtraction input to the reverse of the trigger connected to the first input of the second element AND whose output is connected to To the left input of the OR element, connected to the output bus of the error signal. With

In this case, the output of the pulse detector of positive drops is connected to the direct installation input of the trigger and to the second input of the first element I, the output of which is connected to the second input of the element OR, and the output of the detector of negative differential pulses to the reverse setting of the trigger input and to the second input the second element is And,

The drawing shows one of the variants of the proposed device for reproducing digital information from a magnetic recording medium.

The proposed device contains a magnetic head 1 for reproducing a pulsed two-pole phase-manipulated signal connected to the detector input 2 pulses of positive drops, the output of which is connected to the output bus of 3 sync pulses. Magnetic head 1 is also connected to the detector input 4 of negative-impulse pulses.

The device also contains a reversible counter 5, the output of which is connected to the output bus b of digital information, the reset input to the detector output 2 positive impulses, and the counting input to the output of the generator 7 pulses. The input of the reversible counter 5 is connected to the forward output of the trigger 8 connected to the first input of the first element AND 9. The subtraction input of the reversible counter 5 is connected to the reverse output of the trigger 8 connected to the first input of the second element 10, the output of the element 10 is connected to the first input element OR 11 connected to the output of the output bus 12 of the error signal,

In the proposed device, the output of the detector 2 pulses of positive differences is connected to the direct installation input of the trigger 8 and to the second input of the first element AND 9, the output of which is connected to the second input of the element OR 11, The output of the detector 4 pulses of negative differences is connected to the reverse set trigger input 8 and with the second input of the second element And 10,

Each impulse of a positive differential sets the reversible counter 5 to the zero state, and the trigger 8 to the single state. In this case, the pulse from the direct output of the trigger 8 is fed to the input of the addition of the reversible counter 5, which starts counting ../pulses, feeds the pulse to its counting input of the generator output 7 pulses. Each pulse of the negative differential throws the trigger 8 into the zero state. In this case, the signal from the reverse output of the trigger 8 is fed to the input of the subtraction of the reversible counter, in which it imparts pulses to its counting

the input starts to subtract from the previously accumulated number

The use of the invention significantly reduces the error in the result of reproducing digital information from a magnetic recording medium, and also simplifies the design of the device for reproducing digital information from a magnetic recording medium. The invention may find application in the demodulation of a pulsed two-pole phase-manipulated signal reproduced from a magnetic recording medium.

Claims (1)

1. Japanese Patent 50-5569, Cl, 102 (7) C 2, 1975, 2, Japan Patent I 51-33402,65 cl. 102 E 331, 1976 (yyrotyp). :