由于压缩机的自转频率对压缩机噪声有调制作用,使得普通声压级频谱难以准确反映压缩机噪声的频率特性。本文运用倒频谱分析和解耦技术手段找到了线谱中调制成份,再通过滤波处理,从声压级频谱中剔除了慢变调制成份的影响,使声压级频谱正确反映噪声的频率特性;进而,用倒频滤波奇异值分析,辨识了压缩机各主要噪声源辐射噪声的频率特性。 Since the compressor’s self-rotation frequency has a modulation effect on the compressor noise, it is difficult to accurately reflect the frequency characteristics of the compressor noise in the ordinary sound pressure level spectrum. In this paper, we use the cepstrum analysis and decoupling techniques to find the modulation components in the line spectrum, and then filter out the effects of the slow modulation components from the sound pressure level spectrum to make the sound pressure level spectrum correctly reflect the frequency characteristics of the noise; Furthermore, the frequency characteristic of radiated noise of each main noise source of the compressor is identified by the analysis of the singular values ​​of the caculated filter.