Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1990-07-17
1992-08-04
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 1106
Patent
active
051363755
ABSTRACT:
A spectrum compatible HDTV data transmission system includes an adaptive delta modulator for producing 12-bit packets comprising direction and slope components of successive groups of three samples of removed low frequency video siganl. The 12-bit packets are compressed by a lookup table to four-bit output codes prioritized according to the statistical likelihood of occurrence of the 12-bit packet in a typical video signal. The 15 most likely to occur 12-bit packets are mapped to four-bit output codes 1-15 and the remaining 4080 12-bit packets are mapped to a common four-bit linking code. The next 255 most likely to occur of the remaining 4080 12-bit packets are further mapped to eight-bit output codes. All of the remaining 12-bit packets are mapped to the common remaining state of the eight-bit output codes. The compressed output codes are correlated with the constellation states of a quadrature modulator, with the constellation states requiring the least transmission power corresponding to the most likely to occur of the four-bit output codes. The output codes are multiplexed with the high frequency video before application to the quadrature modulator. The output of the modulator is transmitted at RF frequencies.
REFERENCES:
patent: 4700360 (1987-10-01), Visser
patent: 4745473 (1988-05-01), Hall
patent: 4785356 (1988-11-01), Gonzales et al.
patent: 4821119 (1989-04-01), Gharari
patent: 4969040 (1990-11-01), Gharari
patent: 5016100 (1991-05-01), Citta et al.
Citta Richard W.
Mutzabaugh Dennis M.
Britton Howard W.
Vu Kim Yen
Zenith Electronics Corporation
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