METHOD AND APPARATUS FOR DETECTING A FACSIMILE TRANSMISSION

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 (11) monitors the incoming data for fax signals. If...

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Bibliographic Details
Main Authors JOHN, JOHNNY, K, SIH, GILBERT, C
Format Patent
LanguageEnglish
French
German
Published 05.04.2006
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
SELECTING
TELEPHONIC COMMUNICATION
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Summary: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 (11) monitors the incoming data for fax signals. If a fax is detected, the data processor (12) 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 (11) 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.
Bibliography:Application Number: EP19970947507