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Time Frequency Analysis and Wavelet Transforms

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Time Frequency Analysis and Wavelet Transforms

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    1. 1 Time Frequency Analysis and Wavelet Transforms ????????? ???: ? ? ? Office:???723?, TEL: 33669652 E-mail: djj1@ms63.hinet.net , djj@cc.ee.ntu.edu.tw ????:http://djj.ee.ntu.edu.tw/TFW.htm ???????,???????????!

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    11. 11 I. Introduction

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    25. 25 Why Time-Frequency Analysis is Important? Many digital signal processing applications are related to the spectrum or the bandwidth of a signal. If the spectrum and the bandwidth can be determined adaptive, the performance can be improved. ? modulation, ? signal identification, ? multiplexing, ? acoustics, ? filter design, ? system modeling, ? data compression, ? radar system analysis ? signal analysis, ? sampling

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    29. 29 ???:?????? (by Matlab) ???,????????? *.wav ??? ??: wavread ?: [x, fs] = wavread('C:\WINDOWS\Media\ringin.wav'); ??? ringin.wav ????? x ???? fs: sampling frequency ?????? size(x) = 9981 1 fs = 11025 ??: ??,??????? ??????????

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