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本文介绍了调制转移函数的定义并推导出室内两点间调制转移函数和混响时间以及环境噪声的关系。讨论了调制转移函数的各种测量方法并分析了调制转移函数的一些有用特性以便导出一个语言传输指数用来评价厅堂以及扩声系统的语言可懂度。
This paper introduces the definition of modulation transfer function and deduces the relationship between modulation transfer function and reverberation time and environmental noise between two indoor points. Various measurement methods for modulation transfer functions are discussed and some useful characteristics of the modulation transfer functions are analyzed in order to derive a language transfer index which is used to evaluate the speech intelligibility of halls and sound reinforcement systems.