초록 ▼

A microphone apparatus includes an array of equally spaced microphones divided into a center subarray and a pair of side subarrays located one on each side of the center subarray. A first weighting network having a plurality of weighting factors impresses a first weighting function on signals from t

A microphone apparatus includes an array of equally spaced microphones divided into a center subarray and a pair of side subarrays located one on each side of the center subarray. A first weighting network having a plurality of weighting factors impresses a first weighting function on signals from the center subarray. Second and third weighting networks each having a plurality of weighting factors impress second and third weighting functions respectively on signals from the side subarrays. The first, second and third weighting functions correspond respectively to center and side portions of a total function. Signals from the first weighting network are summed in a first adder, signals from the second and third weighting networks being summed in a second adder and cmbined with the output of the first adder in a third adder to produce an output signal. A variable directivity pattern is obtained by a level setting means which allows adjustment of the level of the output signal from the second adder in a predetermined relationship with the level of the output signal from the first adder.

대표청구항 ▼

A microphone apparatus comprising: an array of equally spaced microphones, the microphones being divided into a center subarray and a pair of side subarrays located one on each side of the center subarray; a first weighting network having a plurality of weighting factors for impressing a first weigh

A microphone apparatus comprising: an array of equally spaced microphones, the microphones being divided into a center subarray and a pair of side subarrays located one on each side of the center subarray; a first weighting network having a plurality of weighting factors for impressing a first weighting function on signals from the microphones of the center subarray. second and third weighting networks each having a plurality of weighting factors for impressing second and third weighting functions respectively on signals from the microphones of said side subarrays, said first, second and third weighting functions corresponding respectively to center and side portions of a sensitivity profile which varies as a function of positions on said array; a first adder for summing signals from said first weighting network; a second adder for summing signals from said second and third weighting networks; a third adder for summing signals from said first and second adders to produce an output signal; and level setting means for adjusting the level of an output signal from said second adder in a predetermined relationship with the level of an output signal from said first adder to provide a variable directivity pattern.