期刊
JAPANESE JOURNAL OF APPLIED PHYSICS
卷 61, 期 SG, 页码 -出版社
IOP Publishing Ltd
DOI: 10.35848/1347-4065/ac4078
关键词
Parametric acoustic array; Parametric sound; Incidence angle; Frequency response of microphone; Nonlinear response
This study evaluates the accuracy of demodulated sound measurements using a condenser microphone in the near field of a parametric loudspeaker system. The results show that using a microphone with low sensitivity at primary sound frequencies placed at an appropriate angle improves parametric sound measurement accuracy.
This study evaluates the accuracy of demodulated sound measurements using a condenser microphone in the near field of a parametric loudspeaker system. Microphones with different sensitivities placed at incidence angles of 0 degrees and 90 degrees were used to measure demodulation frequency components without special acoustic filters. The measured components were compared with theoretical predictions. The results show that the measured sound pressure using microphones placed at 0 degrees was up to several tens of decibels larger than the theoretical predictions and significantly inaccurate in the near field. This was due to the nonlinear response of the microphone, which had high sensitivity at primary sound frequencies, inducing spurious signals. This result suggests that using a microphone with low sensitivity at primary sound frequencies placed at an appropriate angle that reduces sensitivity improves parametric sound measurement accuracy.
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