Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-06-14
1987-06-30
Orsino, Jr., Joseph A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
371 53, 371 54, H04N 712
Patent
active
046774807
ABSTRACT:
Inter-frame encoding/decoding equipment for television signals includes inter-frame encoding equipment generating an encoded signal by encoding a difference between television signals and the output of a frame memory and inter-frame decoding equipment which receives the encoded signal sent from the inter-frame encoding device via a transmission line. The decoding equipment decodes by adding its output of the frame memory to the encoded signal. The inter-frame encoding equipment is provided with a first operation circuit which calculates remainders obtained by dividing a predetermined value, into bit groups of the output or the input of the frame memory. The inter-frame decoding equipment is provided with a second operation circuit which calculates remainders obtained by dividing, the predetermined value, into the bit groups of the output or the input of its frame memory. The inter-frame decoding equipment is further provided with a comparator circuit which compares and checks the remainders calculated by the first and the second operation circuits to detect a transmission error.
REFERENCES:
patent: 3017091 (1962-01-01), Ulrich
patent: 3340504 (1967-09-01), Bellino
patent: 3430037 (1969-02-01), Renelt
patent: 3573726 (1971-04-01), Towell et al.
patent: 3753225 (1973-08-01), Liddell
IEEE, "1.5 Mbit/s Interframe Codec for Video Teleconferencing Signals", 1982, pp. E2.5.1-E2.5.5 (987-991).
Hiraoka Makoto
Kuroda Hideo
Matsuda Kiichi
Mukawa Naoki
Nishiwaki Mitsuo
Fujitsu Limited
NEC Corp.
Nippon Telegraph & Telephone Public Corp.
Orsino Jr. Joseph A.
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