Patent ID: 8903108

Claim:
An electronic device comprising: a speaker; and a microphone array comprising: a first microphone positioned a first distance from the speaker; a second microphone positioned a second distance from the speaker, wherein the first and second microphones are configured to receive an acoustic signal; a complex vector filter coupled to the second microphone, wherein the complex vector filter is applied to an output signal of the second microphone to generate an acoustic sensitivity pattern for the array that provides an acoustic null at the location of the speaker; a first delay circuit coupled to the second microphone; a first difference circuit coupled to the first delay circuit and the first microphone; a multiplier circuit coupled to the output of the first difference circuit; a second difference circuit coupled to the output of the multiplier circuit; a second delay circuit coupled to the first microphone; a third difference circuit coupled to the second delay circuit and an output of the complex vector filter, wherein the output from the third difference circuit is provided to the second difference circuit; and a beamforming circuit coupled to the output of the second difference circuit, wherein the beamforming circuit is configured to form an acoustic sensitivity pattern for the array by adjusting values for the complex vector filter or the multiplier circuit.