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多媒体教室的语言可懂度是由扩声系统和房间声学特性两方面因素决定的.使用SIA Smaart声学测量和分析系统,对一间多媒体教室进行了空场脉冲响应和传输频率特性测量.依据测量数据对混响时间T60和语言传输指数STI(RSTI)、辅音损失率(%ALCons)、明晰度(Clarity)等表征教室语言可懂度的客观评价参量进行了分析,结果显示教室语言可懂度和语言清晰度C50均为“中”等级别,汉语音节清晰度>85%,音乐明晰度C80为“好”;教室后场中高频信噪比较低,房间驻波对低频传输特性造成一定的不良影响.分析结果为教室声场营造提供了有益的参考.
The language intelligibility of multimedia classrooms is determined by both the sound reinforcement system and the acoustic characteristics of the room. Using the SIA Smaart Acoustic Measurement and Analysis System, a space classroom impulse response and transmission frequency characteristics measurements were performed on a multimedia classroom. The data analyzes the objective evaluation parameters such as reverberation time T60, language transmission index STI (RSTI), consonant loss rate (% ALCons), and clarity (Clarity) that represent classroom language intelligibility, and the results show classroom language intelligibility. And language definition C50 are “middle ” grade, Chinese syllable resolution is >85%, music clarity C80 is “good”; classroom after field high frequency signal noise is low, room standing wave to low frequency The transmission characteristics cause some adverse effects. The analysis results provide a useful reference for the construction of the classroom sound field.