Facsimile and static presentation processing – Facsimile – Auxiliary signal
Patent
1997-10-22
2000-09-05
Grant, II, Jerome
Facsimile and static presentation processing
Facsimile
Auxiliary signal
358442, H04N 100
Patent
active
061151424
ABSTRACT:
The present invention provides an apparatus and method for supporting analog fax calls between two wireless subscriber stations in a tandem configuration. The existence of a tandem configuration is detected, and a more efficient communication protocol is established between two base stations upon detection of the tandem configuration. A message generator in a first base station generates an identification message. If the identification message is received by a second base station, the second base station will be informed that the tandem configuration exists. A message generator in a second base station may then generate a return message, which when received by the first base station, will notify the first base station of the existence of the tandem configuration. To support the tandem configuration, full duplex communication may be established between the two base stations. Full duplex communication may be realized by incorporating an echo canceler in the base station, or by utilizing both BFSK channels of the V.21 fax system for communication. The tandem configuration may also be supported by advanced flag synchronization. Thus, after a message is transmitted from a first base station to a second base station, the second base station will immediately start sending preamble flags to the first base station. The first base station may then synchronize its receiver for immediate receipt of the return message from the second base station.
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"Real-Time Transmission of Group 3 Facsimile Over Interconnected Public Switched Digital Mobile Satellite Networks" by Dimolitsas et al.; 8276 Comsat Technical Review 1992, pp. 125-145.
Grant II Jerome
Macek Kyong H.
Qualcomm Incorporated
Wadsworth Philip R.
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