Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2007-04-26
2010-11-30
Ferguson, Keith T (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S519000, C455S500000, C455S517000, C455S426100, C455S403000, C370S270000, C370S328000, C370S329000, C370S343000, C375S130000, C375S146000, C375S147000, C375S242000, C375S244000
Reexamination Certificate
active
07844292
ABSTRACT:
Systems and methods are disclosed for in-band control signaling using bandwidth distributed encoding to send modulated control carrier signals with analog voice signals in the same voice frequency band. A transmitting device generates control carrier signals spread over a voice frequency band, combines them with analog voice signals in the voice frequency band, and transmits the combined signals over a communication channel. The transmitting device can use a control signal encoder to apply a pseudo-random code to the control carrier signal in order to spread it over a voice frequency band. As such, control signals are sent as in-band signals without significantly degrading the voice signals. A receiving device receives the combined signals within the voice frequency band. The receiving device demodulates the combined signal and uses matching pseudo-random codes to determine if a control signal has been sent. The receiving device also reproduces the voice signals themselves. If a code is matched, then an appropriate response to the control signal can be taken.
REFERENCES:
patent: 5235598 (1993-08-01), Sasuta
patent: 5533098 (1996-07-01), Lee
patent: 5625872 (1997-04-01), Sawyer
patent: 6236715 (2001-05-01), Wong
patent: 2005/0068906 (2005-03-01), Muri
patent: 2006/0171368 (2006-08-01), Moinzadeh et al.
patent: 2006/0215639 (2006-09-01), Inagi
patent: 2007/0244695 (2007-10-01), Manjunath et al.
Cisco Systems Inc., Data Sheet, “Cisco Land Mobile Radio Gateway,” 1992-1995.
Cisco Systems Inc., “Land Mobile Radio over IP Enhancement,” 2005.
Cisco Systems Inc., Cisco IOS Software Release 12.4(2)T1, “Cisco Land Mobile Radio over IP Solution Reference Network Design,” Mar. 2006.
Ferguson Keith T
L-3 Communications Integrated Systems L.P.
O'Keefe, Egan Peterman & Enders LLP
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