Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1985-03-15
1987-11-17
Richardson, Robert L.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
G11B 700
Patent
active
047078170
ABSTRACT:
A method of generating a servo signal for a servo system of a disc player employing an optical method of data read-out, whereby a pair of sensing signals derived from reflection of a single light beam from the disc, which differ in phase by an amount corresponding to a tracking error, are processed to derive a first difference signal representing the difference between the respective LF components of the sensing signals and a second difference signal representing the difference between the respective HF envelope components of the sensing signals, with the first and second difference signals being mixed in a differential amplifier in a specific ratio to thereby derive servo signal having no DC offset component, and with the relative proportions of these difference signals prior to this mixing being adjusted by amplifying or attenuating one of the signals such as to established a value for the mixing ratio which is optimized with respect to an amount of tilt of the recording disc or an amount of inclination of an object lens in the optical system, or is set to a value which is a compromise between these optimum values.
REFERENCES:
patent: 4502134 (1985-02-01), Kondo et al.
patent: 4589103 (1986-05-01), Tajima
patent: 4608680 (1986-08-01), Yano
Pioneer Electronic Corporation
Richardson Robert L.
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