H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 3/23 (2006.01) H04B 1/40 (2006.01) H04M 1/60 (2006.01) H04M 9/08 (2006.01)
Patent
CA 2132428
- 32 - A B S T R A C T A speech communication apparatus comprises an echo canceler (30) for canceling an acoustic echo component input from a hands-free speech loudspeaker (13) to a microphone (14). The echo canceler (30) comprises a volume control (36) for variably controlling the volume of a receiving speech signal, an amplitude limiter (35) for limiting the amplitude of an output signal from the volume control (36), an echo canceler (31, 32) for estimating a pseudo echo signal from an output from the amplitude limiter and subtracting the estimated pseudo echo signal from the transmitting speech signal input from the microphone (14), and a nonlinear filter (34) for processing an output from the echo canceler, thereby limiting the amplitude level of the receiving speech signal to a predetermined level or less. Therefore, even if a receiving speech signal having a high receiving speech signal level is input to the echo can- celer, the received speech is not distorted, and an acoustic echo can always be sufficiently canceled by the echo canceler.
Otsuka Koki
Umemoto Yuji
Kabushiki Kaisha Toshiba
Sim & Mcburney
Toshiba Ave Co. Ltd.
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