Method and apparatus for tape speed override operation when reco

Details Method and apparatus for tape speed override operation when reco Method and apparatus for tape speed override operation when reco

1988-11-23

1990-05-29

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 331, 360 191, 360 7304, 360 362, 358335, 358312, G11B 15473, H04N 5783

Patent

active

049300270

ABSTRACT:
A technique for recovering helical audio using the standard synchronous reference clock of the video tape recorder system to conventionally clock the transport and the video signal processor, including the video timebase corrector. A modified audio signal processor clock is generated which is varied commensurate with the desired rate of tape speed override, varying accordingly the flow of audio data through an audio timebase recorder. The speed of a helical scanner is varied in accordance with the rate of tape speed override, to lock the scanner angular position to the audio timebase corrector. In turn, a capstan servo adjusts the tape position in respsonse to the scanner angular position to lock the tape to the scanner. Meanwhile, the video signal processing proceeds conventionally by skipping or repeating fields or frames via a frame store to match the rate of tape speed override.

REFERENCES:
patent: Re33001 (1989-07-01), Baldwin
patent: 4679098 (1987-07-01), Williams et al.

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