Rotating magnetic recording medium recording/playback apparatus

Details Rotating magnetic recording medium recording/playback apparatus Rotating magnetic recording medium recording/playback apparatus

1989-03-22

1992-02-25

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 7706, G11B 502, G11B 5596

Patent

active

050918060

ABSTRACT:
The gain of an envelope detector circuit for detecting the envelope of a signal read from a magnetic head is capable of being changed over between two, namely high and low, stages. The gain of the envelope detector circuit is raised when track search processing is performed. When peak position detection processing is executed for detecting the peak position of the envelope of a recorded signal with regard to a designated track, first the gain of the envelope detector circuit is raised. The gain is lowered when the envelope saturates. This makes it comparatively easy to perform envelope detection, shortens the time required and makes it possible to use even a relatively low-precision A/D converter in the envelope detector circuit.

REFERENCES:
patent: 4587644 (1986-05-01), Fujiie
patent: 4689700 (1987-08-01), Miyake et al.

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