Array ( [0] => Array ( [title] => L15A [link] => https://www.youtube.com/embed/77dBdO4pfrQ ) [1] => Array ( [title] => L15B [link] => https://www.youtube.com/embed/GCF1Hnf-fAE ) ) 國立清華大學開放式課程OpenCourseWare(NTHU, OCW) - 第15R講 Basic Features of Audio Signals