Coarse and fine control of segmented video playback apparatus wi

Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording

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360 10, 360 14, 360 35, H04N 5795

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active

042900875

ABSTRACT:
A system for playback of segmented video information on a tape employs an ancillary recording medium which is rotationally driven at the rotational rate of a primary segment scanning apparatus. Each segment of a video field is recorded in a respective track of the ancillary medium, the information of one field being recorded over the information of another field. By recording only signals of a predetermined quality on the ancillary recording medium, playback of video information from the ancillary medium will produce a coherent display on a display monitor, regardless of the rate at which the tape is run. This is possible because of the one-to-one correspondence between the rotary rates of the scanner and the ancillary medium. Each coherent display is comprised of information from one or a number of video fields. To determine whether signals to be recorded are of the predetermined quality a coarse and a fine measure of signal quality are provided and logically combined. The coarse measure is provided by use of respective identifier tones for the field segments which are played, the purity of the played tones being somewhat determinative of playback signal quality. The fine measure of signal quality is determined by comparing the playback sync rate with a reference sync rate, the error therebetween corresponding to signal quality.

REFERENCES:
patent: 2874214 (1959-02-01), Anderson
patent: 3395248 (1968-07-01), Suzuki et al.
patent: 3454713 (1969-07-01), Yanagimachi et al.
patent: 3557320 (1971-01-01), Hopf
patent: 3662101 (1972-05-01), Segerstrom
patent: 3721757 (1973-03-01), Ettlinger
patent: 3999218 (1976-12-01), Iyama et al.

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