| 摘要 |
PURPOSE:To vary directivity in response to the application by providing a two-dimension signal calculation means applying the product sum calculation between a content of a storage means and a preset coefficient and outputting the result, a digital/analog conversion means converting a digital output signal from the two-dimension signal calculation means converting into an analog signal and a coefficient revision means revising the coefficient by the two- dimension signal calculation means. CONSTITUTION:An output signal from a microphone array 1 is converted into a digital signal by an A/D converter means 2 and a time series signal is stored in a storage means 3. The content of the storage means 3 is subjected to product sum with a preset coefficient at a two-dimension signal calculation means 4. The output of the two-dimension signal calculation means 4 is converted into an analog signal by the A/D converter means 6 to obtain an output signal of the array microphone. In this case, the coefficient of the two-dimension signal calculation means 4 is revised by a coefficient revision means 5 so that the directivity of the array microphone is selected in response to the operating environment as doughnut or twin directivity or single directivity. |
