基于态函数的离散分数余弦倒谱变换在取证话音信息隐藏中的应用-Cepstrum based on the state function of discrete fractional cosine transform application in forensics speech information hiding

Plot the power‐spectrum of the signal at 30.34 seconds. Use an analysis window of 23 ms. Your plot should be labeled as dB in the y‐axis and frequency (Hz) for the x‐axis. Comment very briefly on the spectral characteristic of the signal.