Videotape recorder and reproducer every line velocity compensato

Details Videotape recorder and reproducer every line velocity compensato Videotape recorder and reproducer every line velocity compensato

1974-03-15

1976-01-20

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 576

Patent

active

039342646

ABSTRACT:
A velocity error compensator for a multiple video head VTR in which velocity error compensation is provided for all the lines adjacent a head switch. Separate velocity error detectors are provided in auxiliary channels continuously connected to each respective video head. By providing a mechanical overlap of video heads on the tape velocity error signals are developed for all the lines adjacent a head switch. Depending on the type of velocity error detection employed, the mechanical overlap must be sufficient to provide either simultaneous horizontal sync pulses or both horizontal sync pulses and color bursts from the adjacent heads. Suitable switching is provided to continuously apply the correct velocity error signal to the main channel video signal which is to be corrected. The arrangement avoids banding that develops in multi-generation copies where a line adjacent a head switch is not velocity corrected.

REFERENCES:
patent: 3504111 (1970-03-01), Sumida et al.
patent: 3592961 (1971-07-01), Grace

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