Facsimile communication system

Details Facsimile communication system Facsimile communication system

1988-09-20

1990-03-20

Groody, James J.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358434, 379100, H04N 100, H04N 142

Patent

active

049106104

ABSTRACT:
Four channels of group 3 facsimile signal are transmitted through a digital transmission line of Bearer rate 64 Kbits/s for a speech signal. A facsimile signal is separated into a tone signal, a binary control signal, and a picture signal, each converted to digital form. Then, a block having 160 bits is assembled including 96 data bits and some control bits, and a justification bit. A justification bit matches clock rate of the present system with clock rate of an external digital transmission line by deleting or inserting one bit in a block. Thus, a conventional group 3 facsimile device is coupled with 16 Kbits/s digital transmission line with no design change for the facsimile device itself.

REFERENCES:
patent: 4606044 (1986-08-01), Kudo
patent: 4630126 (1986-12-01), Kaku et al.
patent: 4734780 (1988-03-01), Iwata et al.
patent: 4736249 (1988-04-01), Iizuka et al.

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