Multiplex communications – Wide area network – Packet switching
Patent
1993-06-14
1996-09-24
MacDonald, Allen R.
Multiplex communications
Wide area network
Packet switching
H04J 1100
Patent
active
055597912
ABSTRACT:
In a simultaneous voice and data communications system, a voice signal is added to a data signal before transmission over the public switched telephone network (PSTN). In particular, in every signaling interval, a signal point is selected for transmission as a function of both the voice signal and the data signal. Since the voice signal is effectively offset by the data signal, compandors normally found in the PSTN are not effective in improving the signal to noise ratio of the transmitted voice and data signal. Therefore, the voice signal is additionally companded in the transmitter before transmission over the PSTN. This additional companding by the transmitter improves the signal to noise ratio of the combined voice and data signal.
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Bremer Gordon
Ko Kenneth D.
Smithwick Luke J.
Lucent Technologies - Inc.
MacDonald Allen R.
Onka Thomas J.
Opalach Joseph J.
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