增压器噪声的主客观评价

编写Matlab程序生成不同频率和声级的单频噪声（模拟增压器噪声），分别加入到同一汽车背景噪声中，合成24个声样本。对这些声音进行主观评价实验, 听者用分数来评价背景噪声中单频声的可听见性和可接受程度。对主观评价分数与对应的单频噪声高出背景噪声的分贝数之间、前者与对应的单频噪声的音噪比之间作相关和回归分析，由此得出增压器噪声的限值，作为产品质量控制的参数之一。

Subjective and Objective Evaluation of Turbocharger’s Noise

In this paper, 24 pure tones of different frequencies and pressure levels are generated using Matlab program to simulate turbocharger noises. These pure tones are then added to background noise recorded in the cab of a modern car to synthesize 24 sound samples. Subjective evaluation experiment is carried out on these sounds, in which scores between 0 and 10 are given by the listeners to evaluate the detestability and acceptability of the pure tones in the background noise. And finally, for each sound sample, comparisons are made between subjective evaluation and two acoustic quantities: the first is difference in power spectral level between the pure tone and the background noise, and the second is the tone-to-noise ratio of the pure tone. From this study criteria for controlling turbo noise can be established.