| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for detecting facsimile transmission. SOLUTION: A novel and improved method and an apparatus for providing an interface to a digital wireless telephone system compatible with standard analog wire line telephones and analog wire line facsimile machines are disclosed. During a telephone call, a facsimile detector 11 monitors incoming data for facsmile signals. If facsmile transmission is detected, a data processor 12 switches processing from data processing as if it were a voice to processing it as facsimile transmission. In addition, the remote station is sent a signal notifying it to process the data as facsimile transmission rather than the voice. The facsimile detector 11 is operated by detecting the preamble of a V.21 message present at the beginning of each facsimile call. Energy is measured in both frequencies of the BFSK signals. A decision is made by analyzing the energy and locating a specific pattern which is repeated itself a sufficient number of times. COPYRIGHT: (C)2009,JPO&INPIT
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