Importance

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Abstract

The present invention relates to a desktop speakerphone array processor for microphones which produces high quality sound. The microphone array has a front direction defined by the line of sight from a microphone inlet of the second microphone towards a microphone inlet of the first microphone, the array processor being connected to receive a front microphone signal from the first microphone, a rear microphone signal from the second microphone and an audio output signal representing a speaker sound emitted from a sound driver arranged near the first and second microphones and in the rearwards hemisphere with respect to the front direction of the microphone array, the array processor being configured to provide a first array signal having a first directivity pattern with a main lobe oriented in the front direction of the microphone array in dependence on the front microphone signal, the rear microphone signal and the audio output signal. The array process has a filter configured to filter the rear microphone signal using a first set of filter coefficients and a subtractor configured to subtract the filtered signal from the front microphone signal and to provide the result in a difference signal. The filter controller repeatedly performs a cross-power analysis based on the audio output signal, the front microphone signal and the rear microphone signal and to determine the first set of filter coefficients in dependence on the result of the cross-power analysis.

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First Claim