Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via frequency channels
Reexamination Certificate
2007-01-09
2007-01-09
Shah, Chirag (Department: 2616)
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via frequency channels
C370S410000, C370S436000, C379S093090, C379S093060
Reexamination Certificate
active
09321351
ABSTRACT:
A method and apparatus of transmitting a modulated data over a digital voice network that includes voice compression. The method and apparatus determine whether a voice signal to be transmitted over the network includes a modulated data signal and then encodes or demodulates the modulated data signal and bypasses voice compression when a modulated data signal is detected. The method and apparatus may detect a modulated data signal by detecting the presence of an answer tone and then searching for a plurality of phase reversals having a particular time distance from each other in the voice signal. Once the encoded or demodulated signal is transmitted over the digital voice network, the method and apparatus of the present invention may detect whether the received signal is an encoded data signal or a demodulated data signal. Then the coded data signal may be decoded back into a modulated data signal. Likewise, the demodulated data signal may be modulated back into a modulated data signal. In one embodiment, the invention encodes voice signals including modulated data signals by linearly quantizing the voice signals.
REFERENCES:
patent: 4164036 (1979-08-01), Wax
patent: 5185609 (1993-02-01), DeBord
patent: 5463661 (1995-10-01), Moran et al.
patent: 5528679 (1996-06-01), Taarud
patent: 5959677 (1999-09-01), Date et al.
patent: 5999898 (1999-12-01), Richter
patent: 6263016 (2001-07-01), Bellenger et al.
patent: 6320867 (2001-07-01), Bellenger et al.
patent: 6369737 (2002-04-01), Yang et al.
patent: 6434169 (2002-08-01), Verreault
patent: 6449592 (2002-09-01), Das
Pan, Davis Y, Digital Audio Compression, Spring 1993, Digital Technical Journal, vol. 5 No. 2 whole document.
Bratakos Maroula S.
McNeill Scott
Nuera Communications, Inc.
Schwegman Lundberg Woessner & Kluth P.A.
Shah Chirag
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