Multiplex communications – Duplex – Transmit/receive interaction control
Reexamination Certificate
2005-05-10
2005-05-10
Duong, Frank (Department: 2666)
Multiplex communications
Duplex
Transmit/receive interaction control
C379S003000
Reexamination Certificate
active
06891809
ABSTRACT:
Data is transferred by delaying an audio signal less than fifty milliseconds to produce a shadow signal and combining the shadow signal with the audio signal. The shadow represents the data to be transferred A telephone constructed in accordance with the invention has at least two, separate machine states, each of which includes operating in half duplex mode and two, separate machine states, each of which includes operating in full duplex mode. The state is selected based upon one or more shadows detected at the line input of the telephone.
REFERENCES:
patent: 4748663 (1988-05-01), Phillips et al.
patent: 5386465 (1995-01-01), Addeo et al.
patent: 5455543 (1995-10-01), Kechkaylo
patent: 5455544 (1995-10-01), Kechkaylo
Brennan, Paul V., “Phase-Locked Loops: Principles and Practice”, R.R. Donnelley & Sons Company (1996), pp. 8-9.
Ciccone John Charles
Thomasson Samuel L.
Acoustic Technologies Inc.
Duong Frank
Jagannathan Melanie
Wille Paul F.
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