Diffusion of Sound
b<< λb >> λbbExample :b = 0.1 m
λ = 0.344 m (≈ f = 1 kHz)
BA 7666-11, 36
Example:b = 0.5 m
λ = 0.344 m (≈ f = 1 kHz)
Reflection of Sound
SourceSourceSourceImaginary Source
BA 7666-11, 37
Sound Frequencies
Infra
Audio
Ultra
0.020.2220200200020.000200KHzFrequency
BA 7666-11, 38
Auditory Field
140dB120100Sound Pressure Level80604020020
Thresholdin Quiet50
100
200
5001k2kFrequency [Hz]
5k
10k
20 k
MusicSpeechThreshold of PainLimit of Damage RiskBA 7666-11, 39
960423
Equal Loudness Contours for Pure Tones
120
130120110100908070605040302010Phon20 Hz
100 Hz
1 kHz
Frequency
10 kHz
Soundpressurelevel, Lp
(dB re 20 μPa)
100806040200
BA 7666-11, 40
970379
声学基本概念 - 图文
DiffusionofSoundb<>λbbExample:b=0.1mλ=0.344m(≈f=1kHz)BA7666-11,36Example:b=0.5mλ=0.344m(≈f=1kHz)ReflectionofSound
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