Tracking servo with closed loop gain correction

Details Tracking servo with closed loop gain correction Tracking servo with closed loop gain correction

1984-04-13

1986-10-07

Cardillo, Raymond F.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

358342, 358907, G11B 2110, H04N 5903

Patent

active

046163530

ABSTRACT:
A tracking servo circuit corrects for closed loop gain variations due to wear of the disc, the width of the electrode of the reproducing stylus, etc. The disc contains an information track bounded by servo tracks used to derive a tracking error signal. This tracking error signal is supplied to an AGC circuit after being filtered and detected. The gain of the AGC circuit decreases as the voltage level of the tracking error signal increases. The tracking error is also supplied to an electric-mechanical conversion system after an oscillatory signal of constant frequency and amplitude is added to it. The oscillator signal is used to stabilize the gain of the servo loop. The electric-mechanical conversion system corrects the position of the stylus in response to these signals.

REFERENCES:
patent: Re31160 (1983-02-01), Kinjo
patent: 4148083 (1979-04-01), Watanabe
patent: 4331976 (1982-05-01), Kinjo et al.
patent: 4397010 (1983-08-01), Nabeshima
patent: 4420827 (1983-12-01), Wada et al.
patent: 4499505 (1985-02-01), Sugiyama et al.
patent: 4510531 (1985-04-01), Sugiyama
patent: 4530013 (1985-07-01), Sugiyama et al.
DiStefano, III et al., Schaum's Outline of Theory and Problems of Feedback and Control Systems, .COPYRGT.1967, pp. 116-117, Example 7.8.

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