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¡uµ¦â¡v¡]Timber¡^¬O¤@ӫܼҽkªº¦Wµü¡Aªx«üµ°Tªº¤º®e¡A¨Ò¦p¡u¤Ñ®Ñ¡v³o¨âÓ¦rªºµoµ¡AÁöµM³£¬O²Ä¤@Án¡A¦]¦¹¥¦Ìªºµ°ªÀ³¸Ó¬OÆZ±µªñªº¡A¦ý¬O¥Ñ©óµ¦âªº¤£¦P¡A§ÚÌ¥i¥H¤À¿ë³o¨âÓµ¡Cª½Ä±¨Ó¬Ý¡Aµ¦âªº¤£¦P¡A¥Nªí°ò¥»¶g´Áªºªi§Î¤£¦P¡A¦]¦¹§ÚÌ¥i¥H¨Ï¥Î°ò¥»¶g´Áªºªi§Î¨Ó¥Nªíµ¦â¡CYn±q°ò¥»¶g´Áªºªi§Î¨Óª½±µ¤ÀªRµ¦â¡A¬O¤@¥ó«Ü§xÃøªº¨Æ¡C³q±`§Ú̪º§@ªk¡A¬O±N¨C¤@Óµ®Ø¶i¦æÀWÃФÀªR¡]Spectral Analysis¡^¡Aºâ¥X¤@Óµ®Ø°T¸¹¦p¦ó¥i¥H©î¸Ñ¦¨¦b¤£¦PÀW²vªº¤À¶q¡AµM«á¤~¯à¶i¦æ¤ñ¹ï©Î¤ÀªR¡C¦bÀWÃФÀªR®É¡A³Ì±`¥Îªº¤èªk´N¬O¡u§Ö³t³Å¥ß¸Âà´«¡v¡]Fast Fourier Transform¡^¡A²ºÙ FFT¡A³o¬O¤@Ó¬Û·í¹ê¥Îªº¤èªk¡A¥i¥H±N¦b®É°ì¡]Time Domain¡^ªº°T¸¹Âà´«¦¨¦bÀW°ì¡]Frequency Domain¡^ªº°T¸¹¡A¨Ã¶i¦Óª¾¹D¨CÓÀW²vªº°T¸¹±j«×¡C
Yn¬Ý¬Ý FFT ªº¹ê»Ú®i¥Ü¡A¥i¥H¿é¤J¤U¦C«ü¥O¡G
- dspstfft_nt (MATLAB 5)
- dspstfft_win32 (MATLAB 6 and 7)
- dspstfft_audio (MATLAB 7.12 or later)
¶}±Òªº Simulink ¨t²Î¦p¤U¡G
·í§A±Ò°Êµ{¦¡¨Ã¶}©l¹ï³Á§J·»¡¸Ü®É¡A´N·|¥X²{¤U¦C°ÊºAªº¡uÀWÃйϡv¡]Spectrum¡^¡AÀH®É¶¡¦Ó§e²{«æÁتºÅܤơG
Y±NÀWÃйϡu¥ß¡v°_¨Ó¡A¨Ã¥Î¤£¦PªºÃC¦â¥NªíÀWÃйϪº°ª§C¡A´N¥i¥H±o¨ìÀWÃйï®É¶¡©Ò²£¥Íªº¼v¹³¡AºÙ¬° Spectrogram¡A¦p¤U¡G
Spectrogram ¥Nªí¤Fµ¦âÀH®É¶¡Åܤƪº¸ê®Æ¡A¦]¦¹¦³¨Ç¼F®`ªº¤H¡A¥i¥H¥Ñ Specgrogram ª½±µ¬Ý¥X»yµªº¤º®e¡A³oºØ§Þ³NºÙ¬° Specgrogram Reading¡A¦³¿³½ìªº¦P¾Ç¡A¥i¥H¦b·j´M¤ÞÀº¤W§ä¨ì«Ü¦h¬ÛÃöªººô¶¡A¤]¥i¥H¸Õ¸Õ¦Û¤vªº¥\¤O¡C
- http://cslu.cse.ogi.edu/tutordemos/SpectrogramReading/spectrogram_reading.html
- http://home.cc.umanitoba.ca/~robh/howto.html
Audio Signal Processing and Recognition (µ°T³B²z»P¿ëÃÑ)