Decoding circuit for a read signal from a magnetic recording and

Details Decoding circuit for a read signal from a magnetic recording and Decoding circuit for a read signal from a magnetic recording and

1996-02-02

1999-07-13

Chan, Jason

Pulse or digital communications

Equalizers

Automatic

375232, 370291, H03H 730

Patent

active

059237082

ABSTRACT:
A decoding circuit for a magnetic recording and reading system enables the implementation of an AGC loop with a relatively simple configuration and further enables easy clock extraction and high operating speed. The level setting system for setting the signal level to be taken as the value 1 in the decoding circuit is configured so as to comprise a variable-gain amplifier, a PR4 equalizer having characteristics capable of equalizing to a target PR4 equalization waveform, and a level detector which feeds the output signal back to the variable-gain amplifier as an AGC loop control signal to control the gain thereof. The detection system of the decoding circuit is configured so as to comprise a VFO which generates a system clock fs, and a decision feedback type decoding means in a decision section, which decodes data lines which appear at the output of the PR4 equalizer. In doing this, by configuring the decision feedback type decoding means so as to comprise a decoding means for even data lines and a decoding means for odd data lines, it is possible to reduce the system clock frequency to one half, thereby enabling an increase in the speed of decoding.

REFERENCES:
patent: 5166955 (1992-11-01), Ohta
patent: 5321559 (1994-06-01), Nguyen et al.
patent: 5586144 (1996-12-01), Kahlman et al.
patent: 5598432 (1997-01-01), Wei
patent: 5625505 (1997-04-01), Ohmori et al.
Moon et al.; "Performance Comparison of Detection Method in Magnetic Recording"; IEEE Transactions on Magnetics, vol. 26, Nov. 1990, pp. 3155-3172.

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