Apparatus for correcting the time base of information recovered

Details Apparatus for correcting the time base of information recovered Apparatus for correcting the time base of information recovered

1980-08-11

1982-10-05

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

360 361, 369 48, 358342, H04N 576

Patent

active

043530893

ABSTRACT:
Method and apparatus for recovering information from an information storage medium, such as a disc-shaped record carrier, and for correcting time base variations in the recovered information. The disc includes a plurality of substantially parallel information tracks arranged in a spiral or in concentric circles, and information recorded thereon includes a pilot signal having a predetermined frequency. The apparatus includes means for comparing the phase angle of the recovered pilot signal with the phase angle of a locally generated reference signal, to produce an error signal for controlling a variable delay for correcting time base variations of the recovered information. The pilot signal includes an equal integral number of cycles on each information track, so its phase angle is aligned on adjacent tracks and the apparatus can continue to operate even when the information recovering device is traversing the disc from one track to another or is not critically positioned with respect to an individual information track.

REFERENCES:
patent: 3124662 (1964-03-01), Ryder
patent: 3304377 (1967-02-01), Kietz et al.
patent: 3347997 (1967-10-01), Woodruff
patent: 3506777 (1970-04-01), Carlson
patent: 3573358 (1971-04-01), Markevitch
patent: 3829892 (1974-08-01), Nagahiro et al.
patent: 4084176 (1978-04-01), Trost

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