Method and apparatus for reproducing signals from a rotating...

Details Method and apparatus for reproducing signals from a rotating... Method and apparatus for reproducing signals from a rotating...

H - Electricity

04

N

352/18, 350/38

H04N 5/76 (2006.01) H04N 5/781 (2006.01) H04N 5/92 (2006.01) H04N 9/82 (2006.01)

Patent

CA 1099396

ABSTRACT OF THE DISCLOSURE A method of and apparatus for recovering information from a record medium of the type wherein the information is modulated onto a carrier and recorded in one portion of the record medium and the carrier is recorded in another portion of the record medium. The modulated information is reproduced from the record medium while the medium is rotated, and simul- taneously, the carrier also is reproduced from the medium. The reproduced modulated information then is demodulated with the reproduced carrier to recover the original signal informa- tion. In one embodiment, the recorded information is a composite color television signal and the carrier constitutes the chromi- nance subcarrier for the color television signal. Also disclosed is a method and apparatus for recording signal information on a rotatable record medium. A reference signal is provided and is recorded in a circular track on the record medium. Signal information also is provided and is modu- lated onto the reference signal, the modulated signalinformation then being recorded in a separate portion of the record medium. In one embodiment, the reference signal upon which the signal information is modulated is the previously recorded reference signal that has been played back from the record medium. The signal information may comprise color video signal components and the reference signal may comprise one or more subcarriers for the color video signal components. Preferably, the color video components which are modulated onto the subcarriers are combined with a luminance signal and recorded as a composite color television signal. -1-

268584

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