Transcoding apparatus

Details Transcoding apparatus Transcoding apparatus

1977-06-20

1979-01-23

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 4, H04N 932, H04N 579

Patent

active

041363582

ABSTRACT:
Composite color video signals, of the PAL format, are applied to the input of a 1H delay line (exhibiting a 64 microsecond delay, when f.sub.H = 15,625 Hz.). Output of a first comb filter, using additive combination of delay line input and output signals, is applied to a lowpass filter having a cutoff frequency below the lowest PAL color subcarrier sideband frequency. Output of a second comb filter, using subtractive combination of delay line input and output signals, is applied to: (1) a second 1H delay line; (2) a delay device, providing delay correpsonding to a quarter-cycle at the PAL color subcarrier frequency; and (3) a low pass filter having a cutoff frequency below the lowest buried subcarrier sideband frequency. Outputs of two low pass filters are combined to form luminance signal. Outputs of quarter-cycle delay device and second 1H delay device are additively combined to obtain "V" component of PAL signal, and subtractively combined to obtain "U" component thereof. "V" component is synchronously detected, de-switched, and remodulated on R-Y phase of buried subcarrier (e.g., with frequency at (189/2) f.sub.H + 1/2 f.sub.V), while " U" component is synchronously detected, and remodulated on B-Y phase of buried subcarrier. Remodulator outputs are combined with luminance signal to form composite color video output signal.

REFERENCES:
patent: 2729698 (1956-01-01), Fredendall
patent: 2855573 (1958-10-01), Fredendall
Bruch, "Transcoder PAL-NTSC-...", Telefunken-Zeitung, Jg 37 (1964) Heft 2, pp. 115-130.

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