微机和数字信号处理器模拟室内脉冲响应的音质仿真

Room acoustic simulation from its impulse response by microcomputer and digital signal processor

音质仿真是模拟某一厅堂的听音效果，给人一种如身临其境的感受。本文用微机和数字信号 处理器（ＴＭＳ３２０Ｃ２５Ｅ型）组成一个室内音质仿真系统，将试听声信号──预先在消声室内录制的 “干”语声或标准语音磁带，输入进该系统，并让声信号模拟室内的脉冲响应，作时间延迟和大小衰 减变化，即模拟直达声和随后众多的反射声，最后送入耳机发声，使人感受到仿佛在实际厅堂中听 音。全部过程采用微机控制并且做到了实时仿真。

Acoustics simulation of a room by auralijation technique is of great interest at present. In this-paper,the recorded speech as testing material, passing through a system which includes a microcomputer and a digital signal processor (type TMS320C25E),is to be delayed and decayed in terms of the impulse response. So the direct sound and its refections can be simulated and then be listened through earphones. The whole process with real time characteristics is controlled by a microcomputer.