Method and device for detecting signals from magnetic memory

Claim 1

A method of detecting signals from a magnetic memory in which peaks of the waveform of signals read out of the memory by a magnetic head are detected with reference to a constant threshold level, wherein when a sequence of two peak pulses having the same polarity are detected, a signal corresponding to a peak pulse having the opposite polarity to be detected earlier by 1 bit time than the last one of the two sequential peak pulses is added to output means including a compensation circuit.

Claim 2

A method of detecting signals from a magnetic memory in which peaks of the waveform of signals read out of the memory by a magnetic head are detected with reference to a constant threshold level, wherein when a sequence of two peak pulses having the same polarity are detected, a signal corresponding to a peak pulse having the opposite polarity to be detected earlier by 1 bit time than the last one of the two sequential peak pulses is added to output means including a compensation circuit.

Claim 3

A device for detecting signals from a magnetic memory in which peaks of the waveform signals read out of the memory by a magnetic head are detected with reference to a constant threshold level and in which when a sequence of two peak pulses having the same polarity are detected, a signal corresponding to a peak pulse having the opposite polarity to be detected earlier by 1 bit time than the last one of the two sequential peak pulses is added to output means including a compensation circuit, the device comprising a positive peak sequence detector to detect a sequence of two positive peak pulses, a negative peak sequence detector to detect a sequence of two negative peak pulses, and means for effecting the addition of the signal by receiving an output of either one of said positive and negative peak sequence detectors.

Claim 4

A device for detecting signals from a magnetic memory in which peaks of the waveform signals read out of the memory by a magnetic head are detected with reference to a constant threshold level and in which when a sequence of two peak pulses having the same polarity are detected, a signal corresponding to a peak pulse having the opposite polarity to be detected earlier by 1 bit time than the last one of the two sequential peak pulses is added to output means including a compensation circuit, the device comprising a positive peak sequence detector to detect a sequence of two positive peak pulses, a negative peak sequence detector to detect a sequence of two negative peak pulses, and means for effecting the addition of the signal by receiving an output of either one of said positive and negative peak sequence detectors.

Claim 8

A device for detecting signals from a magnetic memory in which peaks of the waveform signals read out of the memory by a magnetic head are detected with reference to a constant threshold level and in which when a sequence of two peak pulses having the same polarity are detected, a signal corresponding to a peak pulse having the opposite polarity to be detected earlier by 1 bit time than the last one of the two sequential peak pulses is added to output means including a compensation circuit, the device comprising a first flip-flop which is set each time a peak pulSe is detected and reset by a read clock pulse, a second flip-flop for output adjustment and a third flip-flop for compensation inserted between said first and second flip-flops, the setting and resetting condition of which are affected by the output of said first flip-flop and which is reset when a sequence of peak pulses having the same polarity are detected, wherein said addition of the signal is effected through control of the set and reset conditions of said second flip-flop by the output of said third flip-flop.

Claim 9

A device for detecting signals from a magnetic memory in which peaks of the waveform signals read out of the memory by a magnetic head are detected with reference to a constant threshold level and in which when a sequence of two peak pulses having the same polarity are detected, a signal corresponding to a peak pulse having the opposite polarity to be detected earlier by 1 bit time than the last one of the two sequential peak pulses is added to output means including a compensation circuit, the device comprising a first flip-flop which is set each time a peak pulSe is detected and reset by a read clock pulse, a second flip-flop for output adjustment and a third flip-flop for compensation inserted between said first and second flip-flops, the setting and resetting condition of which are affected by the output of said first flip-flop and which is reset when a sequence of peak pulses having the same polarity are detected, wherein said addition of the signal is effected through control of the set and reset conditions of said second flip-flop by the output of said third flip-flop.

Claim 10

A device for detecting signals from a magnetic memory in which peaks of the waveform signals read out of the memory by a magnetic head are detected with reference to a constant threshold level and in which when a sequence of two peak pulses having the same polarity are detected, a signal corresponding to a peak pulse having the opposite polarity to be detected earlier by 1 bit time than the last one of the two sequential peak pulses is added to output means including a compensation circuit, the device comprising a positive and a negative peak detectors which detect the positive and negative peaks of the waveform of the signals read out from said magnetic memory by said magnetic head with reference to a constant threshold level 1 positive and negative peak sequence detectors which respectively detect two successive positive peak pulses and two successive negative peak pulses generated while three read clock pulses are counted; a first flip-flop which is set by the output of either one of said positive and negative peak detectors and reset by the read clock pulses; a compensation flip-flop whose setting and resetting conditions are affected by the output of said first flip-flop and which is set by the output of either one of said positive and negative peak sequence detectors; and an output flip-flop whose setting and resetting conditions are affected by the output of said compensation flip-flop, wherein the signal detection is performed in dependence upon the change in the output of said output flip-flop.

Claim 11

A device for detecting signals from a magnetic memory in which peaks of the waveform signals read out of the memory by a magnetic head are detected with reference to a constant threshold level and in which when a sequence of two peak pulses having the same polarity are detected, a signal corresponding to a peak pulse having the opposite polarity to be detected earlier by 1 bit time than the last one of the two sequential peak pulses is added to output means including a compensation circuit, the device comprising a positive and a negative peak detectors which detect the positive and negative peaks of the waveform of the signals read out from said magnetic memory by said magnetic head with reference to a constant threshold level 1 positive and negative peak sequence detectors which respectively detect two successive positive peak pulses and two successive negative peak pulses generated while three read clock pulses are counted; a first flip-flop which is set by the output of either one of said positive and negative peak detectors and reset by the read clock pulses; a compensation flip-flop whose setting and resetting conditions are affected by the output of said first flip-flop and which is set by the output of either one of said positive and negative peak sequence detectors; and an output flip-flop whose setting and resetting conditions are affected by the output of said compensation flip-flop, wherein the signal detection is performed in dependence upon the change in the output of said output flip-flop.