Telecommunications – Radiotelephone system
Patent
1995-07-27
1998-09-22
Bost, Dwayne
Telecommunications
Radiotelephone system
455570, 455278, 455282, 379410, 379406, H04M 1100
Patent
active
058129448
ABSTRACT:
In a mobile radio communication system where a base station is connected to a public switched telephone network, a hybrid unit and an echo canceler are provided in the base station. A mobile radiotelephone unit receives a base-to-mobile coded speech signal from the base station on a downlink channel and transmits a mobile-to-base coded speech signal on an uplink channel. In order to avoid the interruption of a base-to-mobile speech signal at the echo canceler which would occur as a result of a delayed, high-amplitude mobile-to-base analog speech signal, the mobile unit compares the energy parameter of the mobile-to-base coded speech signal and the energy parameter of the base-to-mobile coded speech signal, determines the difference therebetween when the former is higher than the latter, and reduces the energy parameter of the mobile-to-base speech signal by an amount corresponding to the difference.
REFERENCES:
patent: 5111454 (1992-05-01), Hung et al.
patent: 5515397 (1996-05-01), Wiorek
patent: 5553137 (1996-09-01), Nyhart et al.
patent: 5559881 (1996-09-01), Sih
patent: 5592548 (1997-01-01), Sih
Bost Dwayne
Ferguson Keith
NEC Corporation
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