Low frequency audio sub-channel embedded signalling
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United States of America Patent
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-
Jan 25, 1994
Grant Date -
N/A
app pub date -
May 15, 1992
filing date -
May 15, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A T1 based digital transmission system includes audio subchannel embedded signalling, instead of 'robbed bit' signalling, to transmit signalling information along with voice communications. Signalling bits are produced in a sub-audio range and combined with voice information signals in the audio range. The resultant signal is transmitted over a T1 link to a receiver which recovers the signalling bits and voice information signals. The technique can be applied using adaptive pulse code modulation to increase the number of channels. A digital signal processor can implement channel functions.
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