H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 9/08 (2006.01)
Patent
CA 2282362
A method of increasing the terminal coupling loss in a digital half-duplex handsfree terminal is provided. When the terminal receive channel is active an idle code which is effectively zero is transmitted by an idle code generator. When the terminal transmit channel is active a normal speech signal is transmitted. To determine which channel is active, a receive speech signal level is measured at the receive channel input, and a "virtual" transmit speech signal is computed from a signal in the transmit channel before the idle code generator.
L'invention concerne un procédé qui permet d'accroître la perte au couplage du terminal dans un terminal mains libres numérique semi-duplex. Quand le canal de réception du terminal est actif, un code repos, qui effectivement est zéro, est émis par un générateur de code repos. Quand le code d'émission du terminal est actif, un signal vocal normal est émis. Pour déterminer quel canal est actif, un niveau de signal vocal de réception est mesuré au niveau de la sortie du canal de réception, et un signal d'émission "virtuel" est calculé à partir d'un signal dans le canal d'émission avant le générateur de codes repos.
Coverdale Paul Vincent
Forrester Christopher Michael
Nortel Networks Corporation
Nortel Networks Limited
Smart & Biggar
LandOfFree
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