Method and apparatus for reproducing signals from a rotating record medium and method and apparatus for making same

Abstract From the Canadian patent

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 information. In one embodiment, the recorded information is a composite color television signal and the carrier constitutes the chrominance subcarrier for the color …