论文部分内容阅读
对于客观参量EDT,或者更确切地说,对于稳态声场衰变曲线的初始斜率与包括所有简正模式在内的平均阻尼常数之间关系的研究工作,已有一些研究者做过,如H.库特鲁夫就曾指出此参量与所测试环境的几何细节有密切关系.因此,文中选择它作为分析工具,以一种较为深入的方式,通过对一个歌剧院的研究,来检验这种关系.通过对脉冲响应在频域上进行分析,这在前人的工作中也采用过.文中对EDT从倍频程以及1/3倍频程加以研究,并利用在Matlab环境下开发的一些工具来探讨乐池的简正模式与从频带中心频率导出的最大的时间值之间的相关关系.研究表明,在所考察的环境中简正模式与衰变曲线的初始斜率之间有良好的相关关系,与自相关系数(ACF)也有良好的相关关系;研究还证实,用于分析的参量本身既是时间的函数,也是脉冲响应频率变化的函数.
For the objective parameter EDT, or rather, the work of some researchers on the relationship between the initial slope of a steady-state sound field decay curve and the average damping constant including all normal modes has been done. Kutluf once pointed out that this parameter is closely related to the geometric details of the environment under test, so the paper chooses it as an analytical tool to examine this relationship in a more in-depth way through the study of an opera house The analysis of the impulse response in the frequency domain has also been used in the work of the predecessors.In this paper, we study the EDT from the octave and 1/3 octave and use some tools developed in the Matlab environment To explore the correlation between the normal mode of the music pool and the maximum time value derived from the center frequency of the band.The research shows that there is a good correlation between the normal mode and the initial slope of the decay curve in the investigated environment, Also has a good correlation with the autocorrelation coefficient (ACF); the study also confirms that the parameters used for the analysis are themselves both a function of time and a function of the frequency of the impulse response.