Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Patent
1993-06-14
1995-12-12
O'Shea, Sandra L.
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
375259, H04L 512, H04L 2704
Patent
active
054757134
ABSTRACT:
In a simultaneous voice and data communications system, a voice signal is mapped into an N-dimensional signal space constellation as a vector, and added to a reference signal point, i.e., a data symbol, where the data symbol is selected from a constellation of data symbols every signaling interval as a function of a data signal. The constellation signal space is further divided into a number of shaped regions, where each region is associated with a different one of the data symbols. The shape of each region is selected as a function of the characteristics of the voice, or audio, signal. In particular, each region illustratively has a rectangular shape.
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Bremer Gordon
Ko Kenneth D.
Smithwick Luke J.
AT&T Corp.
Ning John
O'Shea Sandra L.
Opalach Joseph J.
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