The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 23, 1979
Filed:
Jun. 20, 1977
Jon K Clemens, Skillman, NJ (US);
Michael D Ross, Somerdale, NJ (US);
RCA Corporation, New York, NY (US);
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 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 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.