| 摘要 |
The invention provides a sound-processing device with automatic howl cancellation. The sound-processing device includes an array microphone, a digital signal processor, a power amplifier, and a loudspeaker. The array microphone includes a plurality of microphones, receiving a sound wave at different locations and converting the sound wave to a plurality of audio signals, wherein the audio signals carry howl induced by a sound wave feedback. The digital signal processor includes a beam forming module and an acoustic echo cancellation module. The beam forming module derives a beam signal from the audio signals to suppress out-of-beam howl, and the acoustic echo cancellation module estimates and eliminates howl carried by the beam signal. The power amplifier then amplifies the beam signal subsequent to eliminating howl. Finally, the loudspeaker converts the amplified beam signal to an amplified sound wave.
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