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On the audibility of comb-filter distortions

机译：关于梳状滤波器失真的可听性

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摘要

Superpositions of delayed and undelayed versions of the same signal can occur at different stages of the audio transmission chain. Sometimes it is a deliberate measure to provide audio material with certain spatial or timbral qualities. Often it is a result of multiple microphone signals, sound reflections on walls or latencies in digital signal processing leading to comb-filter-shaped, linear distortions. The measurement of a hearing threshold for this type of distortion with its dependance on reflection delay, relative level and the type of audio content can be the basis for boundaries in everyday recording practice below which undesired timbral distortions can be neglected. Therefore, a listening test was conducted to determine the just noticeable difference for three stimulus categories (speech, a snare drum roll and a piano phrase) and different time delays between direct and delayed signal from 0.1 ms to 15 ms, equivalent to 0.03 - 5.15 m of sound path difference. The results show that comb-filter distortions can still be audible if the level of the first reflection is more than 20 dB lower than the level of the direct sound.
机译：同一信号的延迟和无延迟版本的叠加可能会出现在音频传输链的不同阶段。有时，为音频材料提供某些空间或音质是一种故意的措施。通常是由于多个麦克风信号，墙壁上的声音反射或数字信号处理中的延迟导致梳状滤波器形的线性失真。取决于反射延迟，相对水平和音频内容类型的此类失真的听力阈值的测量可以成为日常录制实践中界限的基础，在该界限之下可以忽略不希望的音色失真。因此，进行了听觉测试，以确定三种刺激类别（语音，军鼓声和钢琴乐句）的明显差异，以及直接信号和延迟信号之间从0.1 ms到15 ms的不同时延，相当于0.03-5.15米的声程差。结果表明，如果第一次反射的电平比直接声音的电平低20 dB以上，梳状滤波器的失真仍然可以听到。

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