Subjective loudness and annoyance of filtered N-wave sonic booms
The contribution of the infrasonic low-frequency content of sonic boom N waves to subjective loudness and annoyance has been investigated. An extended low-frequency response loudspeaker-driven simulation booth was employed, with computer-generated input test signals. For test N waves of 1-ms rise time and 150-ms duration, frequencies below 25 and 50 Hz, respectively, were cut off by digital filters simulating simple RC circuits. The filtered signal amplitude was adjusted versus the amplitude (48 Pa) of a reference unfiltered N wave (effective low-frequency cutoff about 0.1 Hz) until the two sounded equally loud (first experiment) or equally annoying (second experiment). The amplitude differences for equality were very slight: less than 0.6 dB at most. Surprisingly, while loss of the low frequencies slightly decreased the loudness, it slightly increased the annoyance.
- Research Organization:
- Toronto University, Toronto, Canada
- OSTI ID:
- 6006793
- Journal Information:
- J. Acoust. Soc. Am.; (United States), Vol. 65
- Country of Publication:
- United States
- Language:
- English
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