Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-11-26
1993-01-12
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 13, H04N 7133
Patent
active
051794420
ABSTRACT:
A method and apparatus for digital encoding are described for compressing the augmentation channel signals (chrominance and luminance signals for panel information and high frequency luminance and line difference signal) so that this information can be transmitted in a 3 MHz wide RF channel using a digital transmission scheme such as QPSK. Analog signal components are sampled and converted to digital signals. Each of the signals is fed into a separate coder which reduces the number of bits/pixel required to reconstruct the original signal. Compression is achieved by quantization and removal of redundancy. The compression scheme is based on the use of DCT together with VLC. Each augmentation signal has its own coder, which is adapted to the unique statistics of this signal.
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Proceedings of Melecom '87, IEEE pp. 485-488.
Azadegan Faramarz
Cavallerano Alan P.
Fisch Eberhard H.
Tsinberg Mikhail
Britton Howard W.
Marion Michael E.
North American Philips Corporation
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