A计权声级和响度是噪声评价的两种方式。通过对响度计算原理的分析,对比分析出A计权声级在度量低频成分为主的噪声、离散噪声和语音频率范围噪声时会产生误差,使评价结果偏离人的主观感觉。指出要对噪声信号进行深入分析,采用响度评价更科学。ent A weighted sound level and loudness are two ways of noise evaluation. By analyzing the principle of loudness calculation, it is found that the A-weighted sound level produces errors in the measurement of low-frequency component-based noise, discrete noise and noise in the speech frequency range, so that the evaluation results deviate from the subjective perception of people. Pointed out that the noise signal to conduct in-depth analysis, the use of loudness evaluation more scientific. ent