ANGLE-DEPENDENT IN-SITU MEASUREMENTS OF REFLECTION COEFFICIENTS USING A SUBTRACTION TECHNIQUE

被引：84
作者：
MOMMERTZ, E
机构：
[1] Institut für Technische Akustik, RWTH Aachen
来源：
APPLIED ACOUSTICS | 1995年 / 46卷 / 03期
关键词：
D O I：
10.1016/0003-682X(95)00027-7
中图分类号：
O42 [声学];
学科分类号：
070206 ; 082403 ;
摘要：
The paper describes an improved PC-based method of measuring the complex reflection coefficient in situ for perpendicular and oblique sound incidence. From the impulse response measured in front of the surface, the direct sound is cancelled by subtraction with a previously obtained pseudo-free-field response. The frequency response of the reflection coefficient is determined by a fast Fourier transform after gating out parasitic reflections. Additionally, the signal separation is improved using digitally pre-emphasized pseudonoise signals.
引用
收藏
页码：251 / 263
页数：13
相关论文
共 16 条
[1]  
SpandAck, Experimentelle Untersuchung der akustischen Eigenschaften von Baustoffen durch die Kurztonmethode, Annalen der Physik, 20, (1934)
[2]  
Wilms, Heinz, In situ measurement of the complex reflection coefficient of surfaces of walls, Acustica, 75, pp. 28-39, (1991)
[3]  
Garai, Measurement of the sound absorption coefficient in situ: the reflection method using periodic pseudo-random sequences of maximum length, Applied Acoustics, 39, pp. 119-139, (1993)
[4]  
Yuzawa, A method of obtaining the oblique incident sound absorption coefficient through an on-the-spot measurement, Applied Acoustics, 8, pp. 27-41, (1975)
[5]  
Davies, Mulholland, An impulsive method of measuring normal impedance at oblique incidence, Journal of Sound and Vibration, 67, pp. 136-149, (1979)
[6]  
Cops, Myncke, Determination of sound absorption coefficients using a tone-burst technique, Acustica, 29, pp. 287-296, (1973)
[7]  
MacWilliams, Sloane, Pseudo-random sequences and arrays, Proc. IEEE., 84, pp. 1716-1729, (1976)
[8]  
Borish, Angell, An efficient algorithm for measuring the impulse response using pseudo-random noise, J. Audio Eng. Soc., 31, pp. 478-487, (1983)
[9]  
Mommertz, Muller, Measuring impulse responses with preemphasized pseudo random noise derived from maximum-length sequences, Applied Acoustics, 44, pp. 195-214, (1995)
[10]  
Harris, On the use of windows for harmonic analysis with the discrete Fourier transform, Proc. IEEE., 66, pp. 51-83, (1978)
12