Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1993-12-08
1995-09-05
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358434, 358437, 358438, 358435, H04N 132
Patent
active
054483786
ABSTRACT:
A signal sending device (facsimile modem 66; step STA2) responds a call from a calling party and sends a first signal (CED signal) to the calling party. The first signal (CED signal) indicates that a non-voice terminal of the called party is connected to a communication line in response to the call from the calling party. A signal detecting device (facsimile modem 66; step STA3) detects a second signal (CNG signal) while the first signal (CED signal) is sent out from the signal sending device. The second signal (CNG signal) indicates that the calling party is a non-voice terminal. A mode switching device (CPU 61, data modem 65, I/O controller 67; step STA9) automatically changes communication mode from a facsimile mode to a data communication mode when the signal detecting device does not detect the second signal (CNG signal) while the first signal (CED signal) is sent out. A communication control device (CPU 61, facsimile modem 66, I/O controller 67; step STA11) continues detection of the second signal and changes the communication mode from the data communication mode to the facsimile mode whenever the second signal is detected.
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Coles Sr. Edward L.
Lee Fan
Matsushita Graphic Communication Systems Inc.
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