用Fourier變換求取信號(hào)的功率譜---周期圖法
用Fourier變換求取信號(hào)的功率譜---分段周期圖法
用Fourier變換求取信號(hào)的功率譜---welch方法
功率譜估計(jì)----多窗口法（multitaper method ,MTM法）
功率譜估計(jì)----最大熵法（maxmum entmpy method,MEM法）
功率譜估計(jì)----多信號(hào)分類法（multiple signal classification,music法）Fourier transform to strike a signal to the power spectrum - the cycle of plans
Fourier transform to strike a signal to the power spectrum - Sub-cycle Method
Fourier transform to strike a signal to the power spectrum --- welch method
Power spectrum estimated more than window ---- Law (multitaper method, MTM)
---- Power spectrum estimate of maximum entropy (maxmum entmpy method, MEM)
---- More than the estimated power spectrum signal classification (multiple signal classification, music)
