基于数字信号处理器DSP的厅堂音质实时仿真

The Real-time Simulation of The Auditorium Acoustics Based on DSP

厅堂音质是指观演类建筑的听音效果,是目前建筑声学的研究热点。关于厅堂音质的评价虽然有众多的指标,但最终的评价还是取决于人的主观听闻。特别有意义的是对那些处于方案设计阶段或尚未建成的厅堂,如影剧院、音乐厅、礼堂、体育场馆等等,如果能够预先感受其模拟的听音效果,即实现音质的仿真,那么对于指导其建筑声学设计,使之建成后达到理想的音质效果,无疑具有重要的作用。用数字信号处理器,将在消声室内录制的“干”信号,经模—数转换,做仿真在建厅堂脉冲响应的卷积运算,再经数—模转换,输入耳机发声,做到可听化,实现了一定程度上的厅堂音质仿真,为继续深入研究这方面的问题提供了良好的基础。

The auditorium acoustics, which is the up-to-date research subject in architectural acoustics, is about the acoustical qualities in such halls as concert, cinema, opera, gymnasium, etc. And it抯 especially significative for guiding the building design of the above halls by simulating their audible effects. Although there抮e many evaluating parameters or indices of acoustic qualities, the final conclusion is determined by man抯 subjective criterion with audible feeling or description. So a method is proposed in some way to simulate the auditorium acoustics based on DSP by transit 揹ry sound?to digital singal followed by convolution operation on the impulse response from the given model and then return to analog singal with A/D or D/A converter. The whole process can be real-time and audible through the ear-phones finally. And that will be helpful to study the auditorium acoustics and its design of good quality.