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AssigneeHitachi, Ltd.
InventorsYasutaka Nishida, Seiichi Mita, Naoki Satoh, Yoshiju Watanabe
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The object of the invention is to provide an equalizer capable of generating an equalized output compensated in the non-linearity of the signal reproduced by an MR head and a reliable high-density magnetically recorded-signal reproducer. An equalizer of an FIR-type filter structure comprises a plurality of delay elements for delaying input signals by a certain period, a plurality of coefficient processing units provided to input or output taps of the delay elements, and an adder for obtaining the sum of the outputs of the coefficient processing units, in which the distortion of the reproduced waveform can be corrected by a relatively simple circuit structure by comparing the signal value inputted to the coefficient processing unit from each tap with a predetermined threshold level and changing the signal value and a coefficient value to be multiplied in accordance with the comparison result. Therefore, any one of various existing signal processing systems can be applied to the decoding of reproduced signals of an MR head having the non-linear characteristic.
An equalizer comprising:
An equalizer comprising:
An equalizer comprising means for sampling an analog input signal at a bit cycle and outputting separately the an odd-bit signal train and an even-bit signal train of the sampled values and two equalizing circuits for odd bits and even bits for processing said odd-bit and even-bit signal trains and outputting them as odd-bit and even-bit equalization output signals respectively;
A magnetically recorded-signal reproducer comprising a read head using an MR element for reading a code signal recorded on a recording medium, amplification means for amplifying reproduced signals output from said read head, means for sampling the signal output from said amplification means at a predetermined cycle, means for equalizing the signal output from said sampling means in accordance with a predetermined equalization rule, and means for judging the recorded codes read by said read head;
The magnetically recorded-signal reproducer comprising a read head using an MR element for reading a code signal recorded on a recording medium, amplification means for amplifying reproduced signals output from said read head, means for sampling the signal output from said amplification means at a predetermined cycle, means for equalizing the signal output from said sampling means in accordance with a predetermined equalization rule, and means for judging the recorded codes read by said read head;
Dependencies are inferred from the claim text.