H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/11
H04N 9/808 (2006.01) H04N 9/873 (2006.01) H04N 9/877 (2006.01)
Patent
CA 1160739
SO 1341 ABSTRACT A method for recording a color video signal in a plurality of parallel tracks extending obliquely on a magnetic tape includes the steps of sampling the color video signal at a frequency which is at least three times the color sub-carrier frequency of the color video signal, converting the sampled color video signal into digital form, and recording respective pluralities of the digitized samples which are arranged in a predetermined sequence sequentially in the plurality of parallel tracks, the last-mentioned step being performed in a first embodiment by recording respective pluralities of contiguous digitized samples sequentially in the tracks, in which each plurality corresponds to at least one cycle of the color sub-carrier or the last-mentioned step being performed in a second embodiment by alternately separating contiguous ones of the digitized samples into first and second blocks and recording respective pluralities of successive digitized samples of the first and second blocks sequentially in the tracks, the sampling frequency in the second embodiment being equal to four times the color sub-carrier frequency. With this method, the chrominance component of the digital color video signal can be separated during reproduction so as to correct any error in the phase of the color sub-carrier. With the method according to the first embodiment a digital filter having a chrominance characteristic C = (1-Z-2)/2 can be used, and with the method according to the second embodiment, a fourth order digital filter having a chrominance characteristic C = (-1+2Z-2-Z-4)/2 can be used, where Z is a delay transfer characteristic of the respective filters. -1-
361377
Hashimoto Yoshitaka
Shirota Norihisa
Yamamoto Kaichi
Gowling Lafleur Henderson Llp
Sony Corporation
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