Вообще-то удалением сибилянтов занимается de-esser (De-essing (also desibilizing) is any technique intended to reduce or eliminate the excessive prominence of sibilant consonants)
De-hisser направлен на борьбу с поверхностным шумом и шипением плёнки. De-Hisser is designed to remove annoying hiss and noise from both old and new phonograph records as well as tape recordings of many formats.
