Title:
【発明の名称】光ディスク制御装置
Document Type and Number:
Japanese Patent JP2692251
Kind Code:
B2
Abstract:
A gain and phase compensation circuit for use in the servo control system for an optical disk device comprises a digital signal input terminal for receiving an input digital signal to be treated, a first digital filter circuit having an input connected to the digital signal input terminal for compensating a gain of a low frequency band for the input digital signal, a second digital filter circuit having an input connected to the digital signal input terminal for compensating a phase of a high frequency band for the input digital signal, and an output circuit having a first input connected to an output of the first digital filter circuit and a second input connected to an output of the second digital filter circuit for combining the output of the first digital filter circuit with the output of the second digital filter circuit so as to generate a digital servo control signal. The first digital filter circuit includes a down sampling circuit connected to receive the input digital signal for generating a modified digital signal having a sampling frequency lower than that of the second digital filter circuit, a low pass digital filter connected to receive the modified digital signal for compensating a gain of the modified digital signal at the lower sampling frequency, and a hold circuit connected to an output of the low pass digital filter for outputting to the output circuit the output of the low pass digital filter at the same sampling frequency as that of the the second digital filter circuit.
Inventors:
Sawada Hisa
Application Number:
JP7120789A
Publication Date:
December 17, 1997
Filing Date:
March 22, 1989
Export Citation:
Assignee:
NEC
International Classes:
G11B7/085; G05B21/02; G11B7/09; (IPC1-7): G11B7/085; G05B21/02
Domestic Patent References:
| JP237576A | ||||
| JP1307928A | ||||
| JP6410717A | ||||
| JP63201700A |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)