【摘要】 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.更多还原

【Abstract】 Speech intelligibility in a multimedia classroom is determined by both sound reinforcement system and room acoustics factors.Utilizing SIA’s SmaartLive and AcousticTools software programs to measure an unoccupied multimedia classroom,several objective intelligibility assessment indices are obtained from the impulse response and the transfer function.A discussion on the analysis and numerical results show:(1)The Speech Intelligibility and the Clarity(C50) are"Fair",Chinese syllable articulation>85%,Clarity(C80) is considered "Good";(2)Mid-high frequency range with relatively lower SNR at the rear wall;(3)Standing waves modes are well separated at low frequencies leading to very uneven low frequency response.It can provide a salutary reference for classroom acoustical settings.更多还原