Patent ID: 7953456

Claim:
An electronic device, comprising: first and second speakers; a microphone positioned between the first and second speakers, such that the microphone is within a volume of space between a first plane extending through the first speaker and normal to a line extending between the first and second speakers, and a second plane extending through the second speaker and normal to the line extending between the first and second speakers; and circuitry configured to generate first and second audio signals in response to a source audio signal, to play the first audio signal over the first speaker, and to play the second audio signal over the second speaker, the circuitry comprising a first filter configured to filter the source signal to generate the first audio signal and a second filter configured to generate the second audio signal; wherein the first and second audio signals are configured, and the first and second speakers are positioned, so that the first audio signal output by the first speaker and the second audio signal output by the second speaker combine destructively at the microphone, wherein the electronic device includes a housing that is movable between a first position and a second position; and wherein when the housing is in the first position the first filter includes a first set of filter coefficients and the second filter includes a second set of filter coefficients configured to cause the first and second audio signals to interfere destructively at the microphone, and when the housing is in the second position the second filter includes a third set of filter coefficients configured to cause the first and second audio signals to interfere destructively at the microphone.