Along with an audio signal (t), AUX is intended to be transmitted which cannot be separated from the audio signal, is inaudible on reproduction and does not impair sound reproduction quality.

AUX与声频信号(T ')一起传送，前者不能与后者分离，且在后者重现期间该AUX是不可听见的，声音重现质量不会恶化。

youdao

Opting to support all DAPs (rather than taking the iPod-only approach that many automakers have), it sports an aux input just in case ripping CDs directly on the HDD doesn't interest you.

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