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测量某一噪声源的不同位置声级分布和衰减规律时,一般常需要几个人用多台声级计分别在不同距离的多个测点观测读值。虽然事先统一方法,但也不可避免地会出现各操作者之间的读值误差,并且由于难于同步,而给精确比较各测点某一瞬时的声级带来困难。尤其当声源持续时间短且声级变化较大时(例如机车通过固定测点时,其声级可由本底的40dBA～50dBA很快增至100dBA或以上),这种困难就更加突出。使用多导磁带记录仪时被测噪声进行录制并回放分析的方法即可消除个体读数
When measuring the sound level distribution and attenuation law of different positions of a certain noise source, several people usually need to use several sound level meters to observe readings at different measuring points at different distances. Although the method is unified in advance, it is also inevitable that reading errors between the operators will occur and difficulty in accurately comparing the sound levels of a certain instant at each measuring point due to the difficulty of synchronization. This is especially true when the duration of the sound source is short and the sound level varies a lot (for example, the sound level of a locomotive rapidly increases to 100 dBA or above from 40 dBA to 50 dBA at the fixed point). Measured noise recording and replay analysis using multi-guided tape recorder eliminates individual readings