Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1988-09-30
1989-09-12
Britton, Howard W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358133, 375 27, 375 30, H04N 7137, H04N 1104
Patent
active
048665100
ABSTRACT:
A differential pulse code arrangement reduces the bit rate of a composite color video signal by sampling the video signal at a predetermined rate of m times the color sub-carrier frequency, predicting the present video signal sample from reconstructed past samples and forming signal representative of the prediction error in a first predictive loop. The bit rate is further reduced in a second predictive loop embedded in the first predictive loop by generating a signal predictive of the error signal and forming a signal corresponding to the difference between the error signal and the signal predictive thereof. The difference signal is quantized and encoded for transmission. The error signal is reconstructed by summing the quantized difference signal and the predicted error signal and the prediction of the error signal is formed responsive to the sequence of past reconstructed error signals. The m-1th video signal sample is then reconstructed by summing the reconstructed error signal and the signal predictive of the m-1th video sample and a signal predictive of the next occurring video sample is generated responsive to the sequence of past reconstructed video samples.
REFERENCES:
patent: 4137549 (1979-01-01), Ichida et al.
patent: 4536880 (1985-08-01), Grallert
patent: 4541102 (1985-09-01), Grallert
patent: 4656500 (1987-04-01), Mori
patent: 4658239 (1987-04-01), Grallert
Goodfellow Douglas J.
Utberg Daniel N.
American Telephone and Telegraph Company
Britton Howard W.
Cubert J. S.
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