| 摘要 |
PROBLEM TO BE SOLVED: To control the sound pressure of an acoustic signal from a sound source for every frequency. SOLUTION: The sound production system has a sound source 30 which outputs the sound of frequency bands fa -fb , an acoustic sensor 20B which detects sound pressure of the sound at the position separated from the sound source 30 only by the distance r1 , and a sound source controller (not shown in the Figure) which controls the sound source 30 on the basis of a feedback signal R1 from the first sound sensor 20. The sound source controller controls the sound source 30 so that the difference R1 -R1 (fk ) between the sound pressure level R1 of entire frequency bands of the feedback signal R1 from the first sound sensor 20 and the sound pressure level R1 (fk ) of each frequency component of the feedback signal R1 from the first acoustic sensor 20B becomes 10×log (fb -fa ).
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