Abstract: Directional sound acquisition is obtained by combining directional sensitivities in microphones with signal processing electronics to reduce the effects of noise received from unwanted directions. One or more microphones having directional sensitivity including a minor lobe pointing in the particular direction of interest and a major lobe pointing in a direction other than the particular direction are used. Signal processing circuitry reduces the effect of sound received from directions of a microphone major lobe.

Abstract: Directional sound acquisition is obtained by combining directional sensitivities in microphones with signal processing electronics to reduce the effects of noise received from unwanted directions. One or more microphones having directional sensitivity including a minor lobe pointing in the particular direction of interest and a major lobe pointing in a direction other than the particular direction are used. Signal processing circuitry reduces the effect of sound received from directions of a microphone major lobe.

Abstract: Two microphones, or sets of microphones, pointed in different directions are used to generate filter parameters based on correlation and coherence of signals received from the microphones. First signals are obtained from sound received by at least one first microphone. Each first microphone receives sound from a first set of directions including a first principal sensitivity direction. The desired sound direction is included in the first set of directions. Second signals are obtained from sound received by at least one second microphone. Each second microphone receives sound from a second set of directions including a second principal sensitivity direction different than the first principal sensitivity direction. The desired sound direction is included in the second set of directions. Filter coefficients are determined based on coherence of the first signals and the second signals and on correlation between the first signals and the second signals.