Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-12-19
1988-12-13
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
371 54, 375 26, H04N 712
Patent
active
047914858
ABSTRACT:
An inter-frame encoding/decoding equipment for television signals consists of inter-frame encoding equipment encoding a difference between television signals and the output of a frame memory and inter-frame decoding equipment which receives an encoded signal sent from the inter-frame encoding device via a transmission line, which decodes by adding the output of the frame memory to the encoded signal. The inter-frame encoding equipment is provided with a first operation circuit which operates the remainders obtained by dividing, by a predetermined value, the number of bits of logic "1" in the bit groups into which the output or the input of the frame memory is divided by a predetermined unit. The inter-frame decoding equipment is provided with a second operation circuit which operates the remainders obtained by dividing, by a predetermined value, the number of bits of logic "1" in the bit groups into which the output or the input of the frame memory is divided by a predetermined unit. The inter-frame decoding equipment is further provided with a comparator circuit which compares and checks the values operated by the first and the second operation circuits to detect a transmission error.
REFERENCES:
patent: 3484744 (1969-12-01), Gertler et al.
patent: 3573726 (1971-04-01), Towell
patent: 3753225 (1973-08-01), Liddell
patent: 4047221 (1977-09-01), Yasuda et al.
Hiraoka Makoto
Kuroda Hideo
Matsuda Kiichi
Mukawa Naoki
Nishiwaki Mitsuo
Beek Leslie Van
Fujitsu Limited
Griffin Robert L.
NEC Corporation
Nippon Telegraph & Telephone Public Corporation
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