Digital information reproducing apparatus

Details Digital information reproducing apparatus Digital information reproducing apparatus

1993-07-02

1994-12-27

Hajec, Donald T.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

360 59, 360 51, 369 59, G11B 509, G11B 2010, G11B 502, H04N 576

Patent

active

053770544

ABSTRACT:
A digital information reproducing apparatus is arranged to have a first envelope detecting circuit, a second envelope detecting circuit, an operating unit, a comparator, and a switching circuit. The first envelope detecting circuit serves to detect a envelope on the positive side of the output of an equalizing circuit. The second envelope detecting circuit serves to detect a envelope on the negative side of the output of the equalizing circuit. The operating unit serves to produce a difference of the outputs of the envelope detecting circuits. The comparator serves to compare an output of the operating unit with a predetermined signal level. The switching circuit serves to reduce a time constant on which charges stored in a capacitor of each of the envelope detecting circuits are discharged, based on the output signal of this comparator.

REFERENCES:
patent: 4914398 (1990-04-01), Jove et al.
patent: 5210518 (1993-05-01), Graham et al.
Patent Abstracts of Japan vol. 11, No. 62-112230, published Oct. 27, 1987.
Patent Abstracts of Japan vol. 12, No. 62-237808, published Apr. 7, 1988.
Patent Abstracts of Japan vol. 10, No. 61-45470 Jul. 18, 1986.
Patent Abstracts of Japan vol. 9, No. 60-13362 Jun. 5, 1985.

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