Motor servo circuit for disc reproduction apparatus

Details Motor servo circuit for disc reproduction apparatus Motor servo circuit for disc reproduction apparatus

1991-03-29

1993-07-06

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318561, 388813, 369 4429, 369 4432, G11B 1546, H02P 550

Patent

active

052257550

ABSTRACT:
In a LD player, a phase comparison circuit compares the phases of a horizontal synchronizing signal reproduced from a LD with a reference synchronizing signal to generate a phase error signal having a pulse width according to the phase difference. After the phase error signal is amplified by an equalizer amplifier, this phase error signal is supplied to a motor driving circuit, whereby phase servo control is carried out for the spindle motor. After the start of the reproduction of the disc, a variation amount of the phase error signal during a period corresponding to a predetermined number of rotation of the disc is detected as the eccentricity amount of the rotation of the disc. The duty ratio of the phase error signal is digital-modulated according to the eccentricity amount, whereby the servo gain of the entire servo circuit is corrected to an optimum value.

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"A Method of Omitting Image Rotation Component in Video Tracking", pp. 1023-1026, IEEE International Conference on Systems, Man and Cybernetics, Aug. 8-12, 1988.
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Patent Abstracts of Japan, JP A 1 270 458.
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