Research press release


Scientific Reports

Engineering: 3D-printed vocal tract reproduces sound of ancient mummy



今回、David Howard、John Schofieldたちの研究チームは、非破壊CTを用いて、3000年前のエジプト人聖職者Nesyamunのミイラ化した遺体の喉頭と咽喉の構造のかなりの部分が、ミイラ化過程の結果、無傷のまま残ったことを確認した。これによって研究チームは、CT画像から声道の形状を測定することができ、この測定結果に基づいて、Nesyamunの声道を3D印刷によって作製し、音声合成に一般的に用いられる人工喉頭と併用した。この研究チームは、英語の単語「bed」と「bad」にそれぞれ含まれる母音の中間に位置付けられる単音を再現できるようになった。


The sound produced by the vocal tract of a 3,000 year-old Egyptian mummy has been synthesized using CT scans, 3D printing and an electronic larynx. The findings are presented in a study published in Scientific Reports. The acoustic output is a single sound; it does not provide the basis for synthesizing running speech.

The precise dimensions of an individual’s vocal tract produce a unique sound. If the dimensions of a vocal tract can be established, vocal sounds can be synthesized by using a 3D-printed vocal tract and an electronic larynx. For this to be feasible, the soft tissue of the vocal tract needs to be reasonably intact.

David Howard, John Schofield and colleagues used non-destructive CT to confirm that a significant part of the structure of the larynx and throat of the 3,000 year-old mummified body of the Egyptian priest Nesyamun remained intact as a result of the mummification process. This allowed the authors to measure the vocal tract shape from CT images. Based on these measurements, the authors created a 3D-printed vocal tract for Nesyamun and used it with an artificial larynx commonly used in speech synthesis. They were able to reproduce a single sound, falling between the vowels in the English words ‘bed’ and ‘bad’.

The authors suggest that their proof-of-concept recreation of a vocal tract preserved over three millennia has implications for the way in which the past is presented to the public in the present; it may provide an opportunity to hear the vocal tract output of an individual that lived in ancient times.

doi: 10.1038/s41598-019-56316-y

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