Phase-reversed dithered automatic scan tracking system

Details Phase-reversed dithered automatic scan tracking system Phase-reversed dithered automatic scan tracking system

1982-11-03

1986-06-17

Hecker, Stuart N.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 102, G11B 558

Patent

active

045959609

ABSTRACT:
A dither-controlled automatic scan tracking system for television signal playback includes a field-store memory for storing a scan track control signal related to the average amplitude-tune "shape" of the transducer deflection control signal. The memorized scan track signal is added to a wideband scan track feedback signal to produce a composite signal which improves tracking error. Anomalous errors can result from memorizing signals which are systematic but unrelated to transducer or head deflection from the track. The errors are reduced by reversing the dither phase each television field, thereby allowing those signals unrelated to deflection to be identified and cancelled. The dither phase reversal can be switched or a continous phase progression.

REFERENCES:
patent: 4148082 (1979-04-01), Okada et al.
patent: 4151570 (1979-04-01), Ravizza et al.
patent: 4197564 (1980-04-01), Ravizza
patent: 4210943 (1980-07-01), Nakamura et al.
patent: 4249220 (1981-02-01), Yasutake et al.
patent: 4255768 (1981-03-01), Kubota
patent: 4368492 (1983-01-01), Chamberlain et al.
patent: 4443823 (1984-04-01), Sakamoto
patent: 4470079 (1984-09-01), Tsurata
patent: 4471392 (1984-09-01), Zorbalas

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