Tracking servo control system for an information read-out system

Details Tracking servo control system for an information read-out system Tracking servo control system for an information read-out system

1984-04-04

1985-10-01

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With compensating features

360 77, G05D 23275

Patent

active

045448728

ABSTRACT:
Tracking servo control system for an information read-out system such as a video disc player system or a compact disc player system, comprises a servo loop switch for opening and closing the tracking servo loop, and a timing control circuit for generating a timing signal for controlling the servo loop switch in accordance with an on-track signal generated from a pickup output signal and zero cross timings of the tracking error signal. In order to control the operation of the servo loop switch, very accurately, a phase shift circuit is provided between a tracking signal generating means and a zero cross detection means, which has substantially the same phase characteristics as that of an equalizer circuit utilized in the tracking servo loop.

REFERENCES:
patent: 4168457 (1979-09-01), Rose
patent: 4263627 (1981-04-01), Rose et al.
patent: 4270073 (1981-05-01), Harman
patent: 4338682 (1982-07-01), Hosaka
patent: 4340950 (1982-07-01), Kosaka
patent: 4344165 (1982-08-01), Akiyama
patent: 4484235 (1984-11-01), Yokobori et al.

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