利用声场双耳互相关函数和声源自相关函数计算音乐信号与脉冲响应卷积信号的IACC(英文)

Calculation of IACC of Any Music Signal Convolved with Impulse Responses by Using the Interaural Cross-Correlation Function of the Sound Field and the Autocorrelation Function of the Sound Source

双耳脉冲响应(BIRs)是用以表征音乐厅和歌剧院声场特征的参量.由于BIRs是表征声场的转移函数,因此,在消声室中录制的声源信号与BIRs卷积,就代表在实际声场中听到的信号.为了探究原信号的声学特征,一种有效的方法是计算其自相关函数(ACF),因为从ACF中导出的参量能与听者的主观优选良好相关.因此可以说,卷积与相关是室内声学中最重要的计算方法.文中通过将BIRs导出的双耳互相关函数(IACF)和将干信号与BIRs卷积后的IACF作比较,探讨了声源信号与声场之间的关系.在特定条件下,卷积与相关是等同的,此时,干信号与BIRs卷积后的IACC可直接由BIRs导出的IACC与干信号的ACF的有效时间τ_e来表示.

Binaural impulse responses （BIRs） are measured to clarify the aeoustical charaeteristies of the sound filed in concert halls and opera houses. Since BIRs indicate the transfer function of sound fields, an anechoic source convolved with the BIRs represents the signal that listeners hear in that sound field. To find out the acoustical characteristics of the original sound source, it is useful to calculate the autocorrelation function （ACF） because the parameters extracted from the ACF closely relates to the subjective preference of listeners. It can thus be said that the convolution and the correlation are the most important calculative techniques in the room acoustics. This study investigates the relationship between sound sources and sound fiehts by comparing the interaural cross-correlation function （IACF） of BIRs and the IACF of an anechoic source convolved with the BIRs. The convolution and correlation are identical under a certain condition. In this condition, the interaural cross-correlation coefficient （IACC） of an anechoic source convolved with the BIRs can be described by the IACC of BIRs and by the effective duration τe of ACF of the anechoic source.