| 摘要 |
In a method of separating acoustic signals from a plurality of sound sources comprising the following steps: disposing two microphones (MIK 1 , MIK 2 ) at a predefined distance (d) from one another; picking up the acoustic signals with both microphones (MIK 1 , MIK 2 ) and generating associated microphone signals (m 1 , m 2 ); and separating the acoustic signal of one of the sound sources (SI) from the acoustic signals of the other sound sources (S 2 ) on the basis of the microphone output signals (m 1 , m 2 ), the proposed separation step comprises the following steps: applying a Fourier transform to the microphone output signals in order to determine their frequency spectra (M 1 , M 2 ); determining the phase difference between the two microphone output signals (m 1 , m 2 ) for every frequency component of their frequency spectra (M 1 , M 2 ); determining the angle of incidence of every acoustic signal allocated to a frequency of the frequency spectra (M 1 , M 2 ) on the basis of the relative phase angle and the frequency; generating a signal spectrum ( 5 ) of a signal to be output by correlating one of the two frequency spectra (M 1 , M 2 ) with a filter function which is selected so that acoustic signals from an area around a preferred angle of incidence are amplified relative to acoustic signals from outside this area; and applying an inverse Fourier transform to the resultant signal spectrum.
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