Dc-balance-value calculation circuit and recording signal genera

Details Dc-balance-value calculation circuit and recording signal genera Dc-balance-value calculation circuit and recording signal genera

1997-12-05

2000-03-28

Tran, Thang V.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

341 58, G11B 700

Patent

active

060440538

ABSTRACT:
A dc balance-value calculation circuit is used in a recording signal generator for performing the block coding of original data to generate a code word having a series of at least two non-inverted bits and generating a recording signal based on the code word. The dc balance-value calculation circuit calculates a dc balance value representing a shift in the dc balance of the recording signal. The dc balance-value calculation circuit includes: selection means for separating the code word generated by the block coding into unit data of a plurality of bits, and selectively outputting the unit data; determination means for determining a change in a dc balance value for each unit data, based on the unit data output by the selection means; and dc-balance-value calculation means for calculating a dc balance value in accordance with the determination result by the determination means.

REFERENCES:
patent: 4499454 (1985-02-01), Shimada
patent: 5371771 (1994-12-01), Kim

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