前言近十年来,在开发国际性听觉信号中,令人越来越感兴趣的是能明确表示听到后应“立即撤离建筑物”的信号。寻求适当的可听信号,要考虑到噪声强度和频谱是变化的,特别在工业方面更是如此,能“透过”背景噪声和频谱的声设备是设有的,因此应该慎重选择某种声音,使之 INTRODUCTION In the recent decade, there has been an increasing interest in the development of international audible signals as signals that can clearly state that “evacuation of buildings” should be heard immediately. The search for a suitable audible signal takes into account that the noise intensity and spectrum are variable, especially in the industrial context, and that acoustic equipment capable of “passing” background noise and spectrum is present and should therefore be carefully chosen Make it