Multiplex communications – Pulse width modulation
Reexamination Certificate
2003-03-03
2010-10-26
Ngo, Ricky (Department: 2464)
Multiplex communications
Pulse width modulation
C370S261000, C370S494000
Reexamination Certificate
active
07821918
ABSTRACT:
A system and method for communication channel and device control via an existing audio channel. A combined communication signal is received from a communication device comprising an audio signal and a modulated carrier signal via an audio channel. The audio signal is separated from the carrier signal. Digital data is extracted from the carrier signal. Device control is performed utilizing the extracted digital data.
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User's Guide Adminstrator's guide, SoundStation(R) VTX 1000 Operation Manual, (c)2003 Polycom, Inc.
Drell David
Rodman Jeffrey
Ngo Ricky
Nguyen Phuongchau B
Polycom, Inc.
Wong Cabello Lutsch Rutherford & Brucculeri LLP
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