Compress on the way in, expand on the way out, and the medium's hiss goes down with it — how Dolby and dbx actually worked, why they had to match exactly, and why the principle is still everywhere.
Every tape machine, cassette deck and multitrack recorder built between the late 1960s and the arrival of digital had a noise reduction switch on it, usually with a name on it — Dolby B, Dolby C, dbx. Then, within about a decade, the entire category disappeared and has never come back.
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