the waveform plot shows a 500 msec sec tion100msecline of speech waveform a indicate the regions

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The waveform plot shows a 500 msec sec- tion(100msec/line) of speech waveform. (a) Indicate the regions of voiced speech, unvoiced speech and silence (b)For the voiced regions estimate the pitch period on a period by period basis and plot the pitch period vs time for this section of speech