NTSC to PAL transcoder

Details NTSC to PAL transcoder NTSC to PAL transcoder

1979-12-10

1981-08-11

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 942

Patent

active

042837383

ABSTRACT:
R-Y and B-Y color difference components of an NTSC format input signal are demodulated to base-band and a burst flag is added to the R-Y signal. Both the B-Y signal which includes the original base-band burst component and the R-Y signal with the added burst flag are then remodulated on respective quadrature related PAL subcarriers. Alternate line phase reversal is achieved in one embodiment by switching the phase of the R-Y demodulator and inverting the burst flag every other line. In another embodiment the added flag is of constant polarity and the R-Y remodulator reference phase is switched. The remodulator outputs are combined with a luminance component of the NTSC input signal whereby a non-standard video output signal is produced having an NTSC luminance component and a PAL chrominance component to enable monitoring of the NTSC input signal on a PAL color television monitor operating at 525/60 line/field rate.

REFERENCES:
patent: 3384706 (1968-05-01), Davidse
patent: 3449510 (1969-06-01), Steinkopf
patent: 3891994 (1975-06-01), Phillips
patent: 3968514 (1976-07-01), Narahara et al.
patent: 4136358 (1979-01-01), Clemens et al.

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