Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-11-28
1990-06-12
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358136, 375 26, 375 27, H04N 712
Patent
active
049337629
ABSTRACT:
The coding and decoding devices embodying the invention are connected by two paths, a main path and an auxiliary path, of a variable rate digital transmission network. When the main path is capable of dispatching the totality of the information rate that the coding device is able to issue, only a main coder and a main decoder, respectively of the coding and decoding devices, are active. When the main path is not capable of dispatching the totality of the picture information, an auxiliary coder and an auxiliary decoder, respectively of the coding and decoding devices, are also active and the auxiliary path dispatches the part of the information rate that cannot be dispatched by the main path. A decoder and a subtracter are provided in the coding device so as to estimate the part of information not transmitted by the main path.
REFERENCES:
patent: 4513426 (1985-04-01), Jayant
patent: 4837617 (1989-06-01), Brusewitz
J. Guichard and D. Nasse, "L'image Numerique et le Codage" (Coding and the Digital Picture) L'Echo Des Recherches, No. 126, Fourth Quarter, 1986, pp. 21-36.
Eude Gerard
Guichard Jacques
Etat Francais represente par le Ministre des Postes et Telecommu
Parker Michael D.
Shepperd John W.
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