Automatic scan tracking with ringing control

Details Automatic scan tracking with ringing control Automatic scan tracking with ringing control

1982-03-31

1984-09-11

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 102, G11B 558

Patent

active

044713924

ABSTRACT:
A dithered automatic scan tracking system for a videotape playback machine includes a bimorph which with its associated load has a mechanical resonance. In special-effects operating modes, the jump or reset signal which drives the bimorph at the end of its scan to position the playback transducer for the next track excites the mechanical resonance, which causes incorrect demodulation of the detected FM envelope and therefore causes generation of an incorrect AST loop error signal until the excited resonance dies away. A gated phase-lock loop is coupled to the bimorph position sensor and produces clock signals for control of the demodulation of the detected FM envelope. The gate decouples the position sensor from the phase-lock loop during recurrent intervals including those intervals during which the mechanical resonance is excited. This allows generation of a correct error signal immediately after the jump and reduces mistracking.

REFERENCES:
patent: 4080636 (1978-03-01), Ravizza

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