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Why Voice Clones Lisp: Sibilants, Codecs, and the Sounds We Lose
Why do cheap voice clones lisp? Daniel asked, and the answer runs from your teeth to your earbuds. Sibilants like s and sh are broadband noise with no pitch for a codec to lock onto; plosives like p and t are puffs of moving air that shove a microphone diaphragm. Every stage of the chain — microphone, codec, vocoder — is doing its job correctly, and the fricative is what pays for it. A 2023 Aarhus study found AMR-WB cuts off around 5,600 Hz, right through the middle of the sibilant band, and under Opus, f and th become nearly identical in spectral space. The codec isn't broken. It's…
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