音轨是声音中的一个术语，是指在每一个歌曲播放的过程或广告制作过程里一阶一阶的制作最后成了人们听到的乐章，例如：古典唱片机就是利用音轨来发出一首首的歌曲的。

• 术语
• 歌曲
• 音乐
• 音轨转换

An audio signal is a representation of sound, typically as an electrical voltage. Audio signals have frequencies in the audio frequency range of roughly 20 to 20,000 Hz (the limits of human hearing). Audio signals may be synthesized directly, or may originate at a transducer such as a microphone, musical instrument pickup, phonograph cartridge, or tape head. Loudspeakers or headphones convert an electrical audio signal into sound. Digital representations of audio signals exist in a variety of formats.