| 摘要 |
PURPOSE: To suppress an interference signal based on the information related to the directivity by obtaining a wide band estimation value for the direction of a sound source based on a narrow band estimation value obtained from a direction estimator provided for a data processing unit. CONSTITUTION: A beam to be scanned from a sound sensor array 1 is amplified, filtered and A/D converted 2 to produce a signal S(K) which is then delayed to form 3 a signal S(ϕi ) representative of a sound signal received in the directionϕi . It is then subjected to frequency analysis 4 with high resolution and a selected signal S(ϕi , fj ) is delivered at a repetitive frequency of 0.2-1.2Hz to a data processor 5. A direction estimator 6 in the processor 5 delivers a wide band estimation value QBB of the direction Q of a sound source, a track and a confidence factor CF to a general purpose computer 9 based on a narrow band estimation value in order to estimate the directionϕie of the sound source. Furthermore, a correction signal S'(ϕi , fj ) obtained by removing 7 a background signal from the signal S(ϕi , fj ) of repetitive frequency is delivered to a detector 8 where a signal having frequency f'j higher than a threshold value is selected and delivered to the estimator 6 as information for selecting an appropriate signal and to a display 10.
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