Charge pump for restoring DC in an optical recording read channe

Details Charge pump for restoring DC in an optical recording read channe Charge pump for restoring DC in an optical recording read channe

1993-05-19

1994-10-11

Shepperd, John

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

360 51, G11B 576, G11B 509, H04N 576

Patent

active

053553560

ABSTRACT:
An optical recording system having a DC restored read signal for qualifying pulses in the read channel. The equalized and filtered read signal is input to a differentiator and a DC restore circuit. The zero crossings of the differentiated signal which represent the peaks of the pulses are detected. The DC restore circuit inverts the read signal, generates a reference voltage, and compares the negative pulses peaks of the read signal to the reference voltage. The charge of a capacitor is adjusted according to the difference in voltages of the pulse peaks to that of the reference voltage in order to maintain a constant DC level. The DC restored signal is qualified according to a threshold. Only those pulses which have zero crossings and which have been qualified are considered to be valid.

REFERENCES:
patent: 4219152 (1980-08-01), Couch et al.
patent: 4356389 (1982-10-01), Quirey et al.
patent: 4635255 (1987-01-01), Clark et al.
patent: 5021747 (1991-06-01), Isham et al.
patent: 5061843 (1991-10-01), Sato et al.
patent: 5184343 (1993-02-01), Johann et al.
patent: 5263091 (1993-11-01), Waller

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