| 摘要 |
<p>In some embodiments a noise cancellation system includes a first digital microphone to detect ambient noise, a first sigma delta modulator coupled to an output of the first digital microphone, a second digital microphone located near an earpiece speaker to detect an output of the earpiece speaker, a second sigma delta modulator coupled to an output of the second digital microphone, a decimator coupled to the second sigma delta modulator, and an adaptive digital filter to adaptively adjust an output of the earpiece speaker in response to the decimator and the first sigma delta modulator so that the output of the earpiece speaker includes a desired audio and an acoustic signal to cancel some or all of the ambient noise. Other embodiments are described and claimed.</p> |
