Magnetic recording and/or reproducing apparatus with chrominance crosstalk elimination

In apparatus for recording and reproducing periodic information signals comprised of first intervals and predetermined numbers of second intervals included in each of said first intervals and which are recorded in respective areas of successive parallel tracks on a record medium:

• the combination of recording circuit means comprising means for providing said periodic information signals with a carrier having its phase selectively changed in one direction by a first amount of 2.pi./N and in the opposite direction by a second amount 2.pi./M with N and M each being a whole number having an absolute value greater than 2 and which is positive to indicate a phase change in said one direction and negative to indicate a phase change in the opposite direction, and with N and M being selected to satisfy the equation 1/N-1/M=1/2, and control means causing said first amount of phase change of the carrier for each of said second intervals of the information signals recorded in alternate ones of said successive parallel tracks and said second amount of phase change of the carrier for each of said second intervals of the information signals recorded in the remaining ones of said tracks;
• and reproducing circuit means comprising transducer means for reproducing information signals recorded in each of said tracks along with cross-talk signals from tracks next adjacent thereto, and means for providing said information signals reproduced from each of said tracks with a carrier of substantially constant phase and for eliminating said cross-talk signals therefrom on the basis of said first and second amounts of phase change of the carrier with which said information signals are recorded in the tracks which are next adjacent to each other.

In an apparatus for reproducing periodic information signals comprised of first intervals and predetermined numbers of second intervals included in each of said first intervals and which are recorded in respective areas of successive parallel tracks on a record medium with the information signals recorded in alternate ones of said tracks having a carrier the phase of which changes in one direction by a first amount 2.pi./N for each of second intervals of the information signals and the information signals recorded in the remaining ones of said tracks having a carrier the phase of which changes in the opposite direction by a second amount of 2.pi./M for each of said second intervals, with N and M each being a whole number having an absolute value greater than 2 and which is positive and negative to indicate phase changes in said one and opposite directions, respectively, and with N and M being selected to satisfy the equation 1/N-1/M=1/2;

• the combination of transducer means for scanning along said tracks one at a time so as to reproduce the information signals recorded in each of said tracks along with cross-talk signals from the tracks next adjacent thereto, and means for providing said information signals reproduced from each of said tracks with a carrier of substantially constant phase and for eliminating said cross-talk signals therefrom on the basis of said first and second amounts of phase change of the carrier with which the information signals are recorded in the tracks which are next adjacent each other.