The directivity index is often used to represent the performance of beamforming algorithms on hearing aids. For binaural listening modeling, we also need to measure the directivity patterns. The common method to estimate the directivity patterns is using a single rotating sound source. With this method, it is difficult to obtain a good directivity pattern when the performance of the system dependents on the acoustic environment in an adaptive manner. The directivity pattern can be also confounded by other signal processing components. These processing include direction of arrival (DOA) based nonlinear post filtering. This paper proposes a method to extract the directivity patterns of a beamforming algorithm under diffuse noise conditions with a rotating probe signal. We are able to obtain the directivity pattern from the probe signal by spectral subtraction of diffuse noise sound field in a non-intrusive manner.
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