H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/18.31
H04N 5/76 (2006.01) G11B 5/00 (2006.01) H04N 9/84 (2006.01)
Patent
CA 1040307
MAGNETIC RECORDING AND/OR REPRODUCING APPARATUS ABSTRACT OF THE DISCLOSURE In recording periodic information signals, such as, the chrominance signal components of color video signals, having first or field intervals which are further subdivided into second or line intervals and which are recorded in successive parallel tracks on a record medium, interference or cross-talk between signals recorded in adjacent tracks is reduced or eliminated during reproduction by recording the information signals in adjacent tracks with first and second carriers having different frequencies. Upon reproducing the information signals recorded in adjacent tracks with such first and second carriers, the reproduced signals are reconverted to have a common carrier frequency by means of respective first and second reconverting signals which similarly have different frequencies selected so that, although an information signal reproduced from a particular track and reconverted to the common carrier frequency will pass through a comb filter, the cross-talk signals reproduced simultaneously from adjacent tracks will be reconverted to have carrier frequencies at nodes of the comb filter so as to be eliminated by the latter. The circuits by which the first and second carriers and the first and second reconverting signals are produced during recording and reproducing operations, respectively, each include a phase-locked loop having a voltage-controlled variable frequency oscillator whose output frequency is suitably changed in successive field intervals, and preferably in which the center frequency of the voltage-controlled variable frequency oscilator is also changed in the successive field intervals for obtaining rapid stabilization of the respective output frequency. ?
217717
Numakura Toshihiko
Saito Akira
Yamagiwa Kazuo
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