| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect a resonance frequency without requiring experience nor skill since the resonance frequency is detected conventionally by radiating a signal for measurement from a speaker, receiving it by a microphone, and analyzing the output signal of the microphone and not only the analysis result, but also a final measurer's judgment of the resonance frequency by hearing are needed for accurate detection of the resonance frequency. SOLUTION: The resonance frequency in a sound reinforcement space is detected based upon basic amplitude frequency characteristics obtained by radiating the specified signal for measurement from the speaker 13 arranged in the sound reinforcement space 40, 1st amplitude frequency characteristics obtained by radiating the signal for measurement and a 1st delay signal generated by delaying the output of the microphone 14 by a 1st delay time of≥0 and receiving a sound by the microphone 14, and 2nd amplitude frequency characteristics obtained by radiating the output signal of the microphone 14 and a 2nd delay signal generated by delaying the output of the microphone 14 by a 2nd delay time of≥0 and receiving a sound. Here, the 2nd delay time and 1st delay time are different from each other. COPYRIGHT: (C)2006,JPO&NCIPI |
