Low frequency audio sub-channel embedded signalling

Details Low frequency audio sub-channel embedded signalling Low frequency audio sub-channel embedded signalling

1992-05-15

1994-01-25

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

3701101, 379 98, H04J 312

Patent

active

052821978

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.

REFERENCES:
patent: 1469832 (1923-10-01), Hamilton
patent: 2352918 (1944-07-01), Smith
patent: 3666889 (1972-05-01), Zegers et al.
patent: 4757501 (1988-07-01), Gorshe
patent: 4928276 (1990-05-01), Blondeau, Jr. et al.

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