Method and system for speed-modified reproduction of video signa

Details Method and system for speed-modified reproduction of video signa Method and system for speed-modified reproduction of video signa

1978-05-24

1980-07-01

Recker, Stuart N.

Dynamic magnetic information storage or retrieval

Record editing

360 24, G11B 578, G11B 2710, H04N 578

Patent

active

042109388

ABSTRACT:
A head wheel is rotated at a predetermined, essentially constant speed within a tape cylinder over which a tape is guided in a spiral path, on which video signal tracks are recorded in inclined track portions. The instantaneous position of the head wheel is determined, for example by a tacho generator applying signals to a counter, phase-synchronized by the outputs from the head wheel tacho generator. The instantaneous position of the tape is determined, for example from sensing the cross modulation of signals derived from the head as the head crosses from one track portion to another, or by sensing the phase jump of the pulse sequence of the horizontal synchronization signals; the two position signals are combined in a logic stage so that a line address can be derived of a signal transduced at any one instant by said head from an incremental area of the tape, the signal being associated with the line address for storage, for example in a memory for subsequent re-recording or reproduction at a time relation (slow motion or fast motion) differing from the original recording speed.

REFERENCES:
patent: 3535440 (1970-10-01), Watanabe et al.
patent: 3921132 (1975-11-01), Baldwin
patent: 4133009 (1979-01-01), Kittler et al.

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