Ambient noise cancellation for voice communication device

摘要

A system and method for reducing or entirely canceling background or ambient noise from a voice transmission from a communications device. A communications device, such as a mobile telephone, is configured with an ambient noise compensation signal generator that is connected between a microphone and a mixer. The original output of the microphone and a compensation signal generated by the ambient noise compensation signal generator are mixed together prior to being passed to a transmitter. In one embodiment a buffer is provided between the microphone and the mixer to help synchronize the timing of the signals to be mixed. In another embodiment a second microphone is employed to detect ambient noise.

主权项

1. A method, comprising:
detecting, by a first microphone, a first signal containing voice signals and ambient noise; detecting, by a second microphone, a second signal containing the ambient noise; receiving a noise cancellation signal indicating whether to cancel the ambient noise; providing both the first signal detected by the first microphone and the second signal detected by the second microphone to an ambient noise compensation signal generator; responsive to the noise cancellation signal indicating to cancel the ambient noise, enabling an ambient noise compensation signal generator to generate the compensation signal based on the first signal detected by the first microphone and the second signal detected by the second microphone, wherein a mixer mixes the first signal detected by the first microphone with the compensation signal such that the ambient noise contained in the first signal detected by the first microphone is attenuated; and responsive to the noise cancellation signal indicating not to cancel the ambient noise, disabling the ambient noise compensation signal generator, wherein the mixer mixes the first signal detected by the first microphone with the second signal detected by the second microphone, such that the ambient noise contained in the first signal detected by the first microphone is not attenuated.