Digital servo system having a servo loop, a digital filter inclu

Details Digital servo system having a servo loop, a digital filter inclu Digital servo system having a servo loop, a digital filter inclu

1997-06-16

1999-10-05

Kim, W. Chris

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 51, G11B 1546, G11B 509

Patent

active

059633905

ABSTRACT:
A digital servo system is provided for controlling a cylinder motor in a video tape recorder. The servo system includes a servo loop and a digital filter inserted in the servo loop. The digital filter includes a coefficient multiplying circuit for multiplying a coefficient. A coefficient changing circuit is further provided for changing the coefficient of the coefficient multiplying circuit. The digital filter is provided to improve the servo gain at a low frequency region. This avoids lag caused by the filter in this region, and advantageously provides resistance to disturbances.

REFERENCES:
patent: 4668900 (1987-05-01), Tabuchi
patent: 4849835 (1989-07-01), Entezarmandi et al.
patent: 4885793 (1989-12-01), Tabuchi
patent: 4954905 (1990-09-01), Wakabashi et al.
patent: 5181078 (1993-01-01), Lefevre et al.
patent: 5220466 (1993-06-01), Coker et al.
patent: 5313343 (1994-05-01), Yatomi
patent: 5391969 (1995-02-01), Tabuchi

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