Also known as desibilizing, desibilising
De-essing (also desibilizing) is any technique intended to reduce or eliminate the excessive prominence of sibilant consonants, such as the sounds normally represented in English by "s", "z", "ch", "j", "t" and "sh", in recordings of the human voice. Sibilance lies in frequencies anywhere between 2 and 10 kHz, depending on the individual voice.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).