Mitigating audible cross talk

摘要

Audible crosstalk can be mitigated in a low-cost three-wire device having audio capability and/or voice applications. In some embodiments, a voltage can be introduced in a microphone power supply that is approximately the same as a measured noise voltage and the resulting voltage appearing at a microphone output can be optimized to mitigate the noise voltage and, thus, the presence of crosstalk. In some embodiments, a microphone within a circuit can be isolated to mitigate crosstalk by introducing current into a circuit that is approximately the same as a measured current, but having a flow in an opposite direction.

主权项

1. A method for mitigating audible crosstalk in a headphone, comprising:
sampling a noise signal produced on a common path shared by a microphone and a speaker; adding the sampled noise signal to a microphone power supply a voltage; substituting the sum of these two added signals for the microphone power signal itself; applying the sampled noise signal at a common node of the microphone and at the power supply of the microphone; and subtracting the microphone output from the noise signal to mitigate a portion of the noise signal and associated crosstalk.