Apparatus and method for adjusting positional sensitivity of dis

Details Apparatus and method for adjusting positional sensitivity of dis Apparatus and method for adjusting positional sensitivity of dis

1995-12-05

1998-10-13

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 7708, 360 7704, 360 7814, G11B 502

Patent

active

058221441

ABSTRACT:
Two position signals N and Q having phases different by 90.degree. are demodulated from discrete readout signals of two-phase servo information through a position signal demodulating circuit. A level detecting circuit compares sizes of two position signals (absolute values) N and Q discretely available from the position signal demodulating circuit through seek operation at a certain speed. A cross-point C is calculated on the basis of two smaller discrete values Z and Y immediately prior to reversal of the size relationship of the two signals at the cross-point and a smaller discrete value X immediately after passage through the cross-point, and the thus calculated cross-point value C is set in an AGC amplifier as a reference amplitude value. The AGC amplifier adjusts the positional sensitivity to a certain value by amplifying the cross-point level of the two position signals N and Q so as to agree with the set reference amplitude value.

REFERENCES:
patent: 5541785 (1996-07-01), Sasamoto

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