Telephonic communications – Telephone line or system combined with diverse electrical... – To produce visual-graphic copy
Patent
1996-11-15
1999-04-06
Chan, Wing F.
Telephonic communications
Telephone line or system combined with diverse electrical...
To produce visual-graphic copy
379 9309, 37910015, 455557, 358442, H04M 1100, H04N 132
Patent
active
058928162
ABSTRACT:
A novel and improved method and apparatus for providing an interface to a digital wireless telephone system compatible with standard analog wire line telephones and analog wire line fax machines is disclosed. During a telephone call, a fax detector monitors the incoming data for fax signals. If a fax is detected, the data processor switches from processing the data as if it were voice to processing it as fax. In addition, the remote station is sent a signal notifying it to process the data as fax rather than voice. The fax detector operates by detecting the preamble of a V.21 message, present at the beginning of every fax call. Energy is measured in both frequencies of the BFSK signals. A decision is made by analyzing these energies and locating a specific pattern which repeats itself a sufficient number of times.
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"Recommendation V.21" CCITT 1984, pp. 65-69.
John Johnny K.
Sih Gilbert C.
Baker Kent D.
Chan Wing F.
Greenhaus Bruce W.
Miller Russell B.
Qualcomm Incorporated
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