Realtime Performance of Acoustic Echo Canceler and Postfilter for Residual Echo Suppression in the Car Environment
نویسندگان
چکیده
Introduction There is a strong acoustic coupling between loudspeaker and microphone of car hands-free telephones. A power coupling factor between -10 dB and 10 dB must be expected. The exact value depends on the desired loudspeaker volume in the presence of background noise and on the installation of loudspeaker and microphone in the car. The impulse response of this electroacoustic loop has a few hundred coefficients at 8 kHz sampling frequency and is very sensitive to movements in the car. Acoustic echo and background noise at the microphone are very annoying for the remote talker.
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