Facsimile apparatus with error correction and improved switching

Details Facsimile apparatus with error correction and improved switching Facsimile apparatus with error correction and improved switching

1990-02-12

1991-10-15

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Facsimile measuring, testing, or calibrating

358434, 358435, 358436, 371 32, 333101, H04N 132, H04L 118, H04L 2502, H01P 110

Patent

active

050579380

ABSTRACT:
A facsimile apparatus includes a transmission system for transmitting with respect to a line, an image signal from a modem, a receiving system for receiving signals from the line, a transmission error detector for detecting the presence of transmission error of received image signals, a backward signal generator for generating backward signals due to the transmission error, notifying the other party of the presence of transmission errors, retransmission circuit for retransmitting image signal when the backward signal is received, the retransmission circuit having a backward signal detector for detecting backward signals, a band pass filter passing signals in a predetermined frequency band, a band elimination filter passing signals in a frequency band other than a predetermined frequency band, an image communication control switcher for switching between an image transmission control and an image receiving control, and retransmission request switcher for switching retransmission control and a response control.

REFERENCES:
patent: 4149142 (1979-04-01), Kageyama
patent: 4622682 (1986-11-01), Kumakura
patent: 4724407 (1988-02-01), Miura
patent: 4726027 (1988-02-01), Nakamura
patent: 4750176 (1988-06-01), Van Veldhuizen
patent: 4939731 (1990-07-01), Reed

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