Facsimile communication system and method
First Claim
Patent Images
1. A facsimile communication system comprising a transmitter and a remote receiver;
- said transmitter includinga scanner which scans each line of documents to be transmitted and supplies facsimile information corresponding thereto,a buffer memory which temporarily stores said facsimile information supplied from the scanner,transmitting means for modulating the facsimile information from the buffer memory and for transmitting the modulated facsimile information to said receiver at a specified one of a plurality of transfer speeds, anda response signal detector which detects a response signal transmitted from the receiver;
said remote receiver includingreceiving means for receiving the facsimile information transmitted from the transmitter,a printing unit which reproduces the documents according to the facsimile information received,an error rate detector, anda response generator which produces the response signal transmitted to the response signal detector in the transmitter,said error rate detector including means for detecting an error rate for the received facsimile information, and means for producing an instruction signal to be provided to said response generator for transmission to said transmitter as said response signal, said response signal detector being responsive to said instruction signal for instructing the transmitting means to select said specified one of said plurality of data transfer speeds in accordance with said error rate.
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Abstract
A facsimile communication system and method in which facsimile information from original documents is sequentially transmitted from a transmitter to a remote receiver. The transmitter is utilized for changing the data transfer speed of the facsimile information in accordance with an instruction signal provided by the remote receiver. The remote receiver supervises the error rate level of each unit of facsimile information of the original documents and provides the instruction signal when the error rate level is detected to exceed a reference error rate level.
59 Citations
20 Claims
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1. A facsimile communication system comprising a transmitter and a remote receiver;
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said transmitter including a scanner which scans each line of documents to be transmitted and supplies facsimile information corresponding thereto, a buffer memory which temporarily stores said facsimile information supplied from the scanner, transmitting means for modulating the facsimile information from the buffer memory and for transmitting the modulated facsimile information to said receiver at a specified one of a plurality of transfer speeds, and a response signal detector which detects a response signal transmitted from the receiver; said remote receiver including receiving means for receiving the facsimile information transmitted from the transmitter, a printing unit which reproduces the documents according to the facsimile information received, an error rate detector, and a response generator which produces the response signal transmitted to the response signal detector in the transmitter, said error rate detector including means for detecting an error rate for the received facsimile information, and means for producing an instruction signal to be provided to said response generator for transmission to said transmitter as said response signal, said response signal detector being responsive to said instruction signal for instructing the transmitting means to select said specified one of said plurality of data transfer speeds in accordance with said error rate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A facsimile communication method for communicating facsimile information between a transmitter and a remote receiver through a transmission line at a desired one of a plurality of specified data transfer speeds, said method comprising the steps of:
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scanning a document to produce the facsimile information in the transmitter; modulating the facsimile information; transmitting the modulated facsimile information to the remote receiver at said desired one of the specified data transfer speeds of the transmitter; demodulating the transmitted facsimile information; reproducing the documents according to the facsimile information in the remote receiver; detecting the error rate of the demodulated facsimile information and comparing same to a predetermined reference rate; producing an instruction signal instructing the selection of said desired one of the plurality of specified data transfer speeds when the detected error rate exceeds the predetermined reference rate; transmitting said instruction signal back to the transmitter; and processing the instruction signal at said transmitter to determine said desired one of said plurality of specified data transfer speeds.
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9. A facsimile transmitter for producing facsimile information and transmitting said produced facsimile information to a remote receiver at a desired one of a plurality of specified data transfer speeds based on a facsimile transmission error rate comprising:
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a scanner for scanning documents to be transmitted to develop facsimile information; a buffer memory for temporarily storing said facsimile information developed by the scanner; and transmitting means for modulating the facsimile information from the buffer memory and for transmitting the modulated facsimile information to the remote receiver at said desired one of the plurality of specified data transfer speeds; said remote receiver including means for developing an instruction signal indicating said desired one of the plurality of specified data transfer speeds to be utilized based on the facsimile transmission error rate, and for transmitting said instruction signal back to the transmitter; said transmitter further including transmission control means responsive to said instruction signal from said remote receiver for instructing the transmitting means to select said desired one of the specified data transfer speeds. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A facsimile remote receiver for processing facsimile information transmitted thereto by a transceiver at a desired one of a plurality of data transfer speeds based on the error rate of said facsimile information transmission, said receiver comprising:
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means for receiving the transmitted facsimile information from said transceiver; printing unit means for reproducing the documents according to the facsimile information; error rate detector means for detecting the error rate of the facsimile information and for producing an instruction signal; and means for transmitting said instruction signal to the transceiver, the transceiver being responsive thereto for selecting said desired one of the plurality of data transfer speeds. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification