phonautographic

phonautographic

(fəʊˌnɔːtəˈɡræfɪk)
adj
(Phonetics & Phonology) relating to a phonautograph or a piece of equipment that records sound visually by detecting the sound waves and indicating them on a graph
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Here we come to the question of fidelity: Whether in the archive, the field recording, or the phonautographic record, what does it mean to bring things in from the "field"?