Zhou B, Green D M, Middlebrooks J C
Psychology Department, University of Florida, Gainesville 32611.
J Acoust Soc Am. 1992 Aug;92(2 Pt 1):1169-71. doi: 10.1121/1.404045.
This report explains the use of a complementary series, Golay codes, for probing the impulse response of the external ear. The codes are used to measure both the resonance of the human ear canal, using a sealed sound-delivery system, and to measure the transfer function of the pinna, using a free-field source. With two series of 512 binary numbers, the improvement in signal-to-noise ratio over a single impulse approaches the theoretical value of 30.1 dB [10 log(2.512)]. This technique has many of the same properties as maximal-length sequences [M. R. Schroeder, J. Acoust. Soc. Am. 66, 497-500 (1979)], but it has the added advantage that the sequence length is an integer power of two and is, therefore, particularly convenient to use with modern Fourier transform techniques.
本报告解释了使用互补序列戈莱码来探测外耳的脉冲响应。这些码用于通过密封的传声系统测量人耳道的共振，并通过自由场源测量耳廓的传递函数。使用两组512位二进制数，与单个脉冲相比，信噪比的改善接近理论值30.1 dB [10 log(2.512)]。该技术具有许多与最大长度序列相同的特性[M. R. 施罗德，《美国声学学会杂志》66, 497 - 500 (1979)]，但它还有一个额外的优点，即序列长度是2的整数幂，因此特别便于与现代傅里叶变换技术一起使用。
