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Dolby® A

From Chace Audio

Dolby® A was the first noise reduction scheme developed by Dolby Labs for professional use with analog tape and film formats to combat tape hiss. In the simplest definition of how it works, it pre-emphasizes the frequencies where tape hiss lives during the encoding stage and then de-emphasizes the audio when decoded. In turn, removing any tape hiss that might have been induced along the way. Dolby A noise reduction has been used for decades and is still in use today, mostly in optical soundtracks.

A track encoded with Dolby A noise reduction that is played back without decoding will sound very bright and hissy. In turn, a track that is not Dolby A encoded, but is mistakenly played back through a decoder, will sound muffled and the audio levels will pump.