Pulse or digital communications – Pulse code modulation
Reexamination Certificate
2006-04-18
2006-04-18
Chin, Stephen (Department: 2634)
Pulse or digital communications
Pulse code modulation
C375S260000
Reexamination Certificate
active
07031394
ABSTRACT:
A method for conveying over telephone lines digitized voice signals simultaneously with digital data signals by means of a communication system, having a transmitter having a discrete multi-tone unit yielding a plurality of carriers of different frequency, several of which are assigned to the voice signals and others to the data signals. The carriers for transmitting voice are selected on the basis of their signal-to-noise ratio characteristics, which carriers can be reallocated dynamically to data transmission. A first tone ordering circuit assigns data streams to data carriers, and a second tone ordering circuit assigns voice streams to voice carriers. Each carrier is modulated by QAM modulation, the data carriers by a sequence of QAM symbols representing data and the voice carriers by a sequence of QAM symbols representing voice. QAM modulation is carried out by a first constellation encoder that modulates the data carriers and a second constellation encoder that modulates the voice carriers.
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AlphaPatent Associates Ltd.
Chin Stephen
CopperGate Communications Ltd.
Swirsky Daniel J.
Vartanian Harry
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