Registers – Coded record sensors – Particular sensor structure
Patent
1993-02-01
1995-05-16
Shepperd, John
Registers
Coded record sensors
Particular sensor structure
369 59, 369124, G11B 708
Patent
active
054163099
ABSTRACT:
In compliance with a variation in the speed of relative movement between a reciprocating optical recording medium and an optical head, an information regenerating apparatus produces a bit clock precisely and regenerate information correctly. To achieve this purpose, in this apparatus, information regenerating light receiving elements produce preceding and succeeding signals with a time difference between them. Based on a preceding one of the signals, a pulse spacing sampling circuit, a pulse multiple detecting circuit, a memory circuit, and a reference period calculating circuit produce a reference period. Based on a succeeding signal, a circuit for generating a signal to be demodulated produces a demodulated signal. Based on the reference period and a synchronizing signal, a demodulating circuit uses the bit clock generated by the clock generating circuit to demodulate the data carried on the signal to be demodulated.
REFERENCES:
patent: 4896309 (1990-01-01), Yamakawa et al.
patent: 5060208 (1991-10-01), Nagai et al.
patent: 5253243 (1993-10-01), Suzuki
patent: 5267226 (1993-11-01), Matsuoka et al.
Olympus Optical Co,. Ltd.
Shepperd John
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