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Absolute polarity 絕對極性

Whether a whole signal chain preserves the sign of the original pressure change, so that a source moving towards the microphone ends with a loudspeaker cone moving towards the audience. Largely inaudible on symmetrical waveforms and sometimes audible on asymmetrical ones such as kick drum, bass, brass and plosives. Worth getting right because it is free to get right, and distinct from relative polarity between two sources, which is not subtle and cancels real output.

中文

整條訊號鏈是否保留原始壓力變化的正負號，亦即聲源朝麥克風移動時，喇叭紙盆最終是否朝觀眾方 向移動。對稱波形上大致聽不出來，但在大鼓、貝斯、銅管與爆破音等非對稱波形上有時可聽辨。由 於校正的代價為零，值得做對；它與兩個聲源之間的相對極性截然不同，後者並不細微，且會實際抵 消輸出。

Regional usage

Easy to get wrong

Sources

• AES standards for audio engineering — Audio Engineering Society primary