Enhancement of quadrature modulated chroma by luminance or chrom

Details Enhancement of quadrature modulated chroma by luminance or chrom Enhancement of quadrature modulated chroma by luminance or chrom

1982-02-16

1985-03-12

Chin, Tommy P.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, 358 40, H04N 521, H04N 9535

Patent

active

045048533

ABSTRACT:
A color television processing system enhances aperiodic transitions occurring in a quadrature modulated subcarrier by deriving a control signal from simultaneously occurring aperiodic transitions in the baseband of the carrier, such as luminance (or from chrominance in the absense of an effective luminance transition) without demodulation of the chroma subcarrier. The system includes an input, a delay match for delaying a first component of the modulated subcarrier signal by a predetermined amount, a one-half period delay for delaying a second component of the modulated subcarrier signal by half the period thereof, and a first adder for combining in equal amounts a third component of the modulated subcarrier with the delayed second component thereof to provide a transition envelope. A control generator receives the baseband signal and chroma and derives a control signal from transitions occurring in the baseband or in chroma in the absence of baseband transitions. A multiplier multiplies the transition envelope signal by the control signal to provide an enhancement product. A second adder combines the delay matched first component in phase with the enhancement product to put out the enhanced modulated subcarrier characterized by shortened transitions in alignment with simultaneous transitions in the baseband. An active chroma phase equalizer for processing the chroma sidebands is also disclosed.

REFERENCES:
patent: 4030121 (1977-06-01), Faroudja
patent: 4181917 (1980-01-01), Richman
patent: 4331971 (1982-06-01), Bretl

Affiliated with

Also associated with

Rating

Enhancement of quadrature modulated chroma by luminance or chrom does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Enhancement of quadrature modulated chroma by luminance or chrom, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Enhancement of quadrature modulated chroma by luminance or chrom will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-710777