Method and apparatus for reducing the turn-around time in facsim

Details Method and apparatus for reducing the turn-around time in facsim Method and apparatus for reducing the turn-around time in facsim

1990-02-06

1991-06-18

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379100, 375 8, H04M 1100

Patent

active

050254693

ABSTRACT:
Previously recommended methods of transmitting facsimile data on the telephone network resulted in periods of time when there is no signal present in the network; one consequence of this was that the retraining time required for the facsimile modem's receiver after each quiet period was undesirably long. This problem is solved by the high-speed transmitter sending two or more holding tones whenever it is not sending training or facsimile signals; these tones prevent re-routing of a telephone connection and allow the high-speed receiver to continue to track data clock and carrier frequencies, thereby considerably reducing the time required for retraining.

REFERENCES:
patent: 3737776 (1973-06-01), Fletcher et al.
patent: 4551581 (1985-11-01), Doughty
patent: 4727429 (1988-02-01), Ueno
patent: 4856030 (1989-08-01), Batzer et al.
patent: 4894847 (1990-01-01), Tjahjadi et al.

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