報告時間：2024年6月5日（周三） 15:00
報告地點：bet356手机版唯一官网九龍湖校區計算機樓513室
報告人：Patrick Flandrin 教授 法國裡昂高等師範學院
主持人：張敏靈
報告人簡介：Patrick Flandrin教授，法國科學院院士、法國國家科學研究中心(CNRS)主任研究員、法國裡昂高等師範學院教授、bet356手机版唯一官网“名譽教授”、IEEE會士、歐洲信号處理學會會士。2019至2022年，曆任法國科學院副院長、院長。2009至2019年，擔任法國信号和圖像處理學會主席。長期緻力于信息與信号處理方面研究工作，在非平穩信号時頻分析、多分辨率小波分析等領域取得了卓越成就和重要貢獻。曾獲國際光學工程學會“小波先驅獎”、IEEE信号處理學會“技術成就獎”、 法國國家科學研究中心銀獎、法國榮譽軍團騎士勳章等重要獎項。發表相關學術論文300餘篇(H-Index68)，并撰寫了多本專著，如《時頻分析探索》(劍橋大學出版社，2018年)。
報告摘要：In his seminal work, first published in 1811, Joseph Fouri er was primarily concerned with the building of an analyti c theory of heat, but it was realized soon after that the ex pansion methods he developed for this purpose had pote ntial applications far beyond, in physics as well as in mat hematics. This was in particular the case for sounds whic h, in the middle of the XIXth century, were the object of a quest for graphical representations in time and/or in frequ ency, thanks to dedicated devices. One apparatus desig ner, Rudolph Kœnig, was particularly instrumental in suc h studies, in the two domains. On the one hand, he built an actual Fourier analyzer based on resonators, manom etric flames and mirrors. On the other hand, he collaborat ed with Édouard-Léon Scott de Martinville, an amateur w ho pioneered the project of a « phonautograph » that, in 1857, permitted the first ever recording of a human voice in the form of a graph on a paper sheet. Whereas Scott's objective was transcription and not restitution (as it will b e the case with Edison's phonograph), some of his sound graphs have been recently scanned and digitized, allowin g us to actually hear Scott singing. Beyond exposing the early days of Fourier-based sound analysis and reviving t he forgotten memory of Scott, intertwining those comple mentary approaches via Kœnig is believed to offer a way of revisiting issues such as the physical significance of F ourier modes, or the questionable necessity of their use as features in modern recognition systems.
