| 摘要 |
<p>Ambient noise is cancelled in a wireless communication device using a first microphone (106), a second microphone (108), an inverse signal generator (114), and a mixer (110). The first microphone (106) captures the voice of the user and the ambient noise. The second microphone (108) is positioned to effectively capture the ambient noise, but not the voice of the user. The inverse signal generator (114) receives the ambient noise signal from the second microphone (108) and outputs an inverted form thereof. The mixer (110) combines the signal from the first microphone (106) with the output of the inverse signal generator (114), thereby cancelling the ambient noise captured by the first microphone (106) by destructive interference. Thus, the output of the mixer (110) is a representation only of the voice of the user. The output of the mixer is also provided to the speaker or earpiece of the wireless communication device so that the user can self-regulate tone and level. When the user is listening to an incoming voice signal, the ambient noise is cancelled in the mixer by destructive interference, and the output of the mixer is provided to the speaker (104) or earpiece of the wireless communication device along with the incoming voice signal, without any ambient noise captured by the user's microphone.</p> |
