20091ee114_1_CA1_Solutions

20091ee114_1_CA1_Solutions - UCLA Dept. of Electrical...

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UCLA Dept. of Electrical Engineering EE 114, Winter 2009 Computer Assignment 1 - Solutions Abstract : We consider the analysis of a speech signal in both the time domain and the fre- quency domain. First we look at the time domain representation of the sentence she had your dark suit in greasy wash water all year. At this level we cannot see any periodicity of the signal. We then focus in on the word, wash. From this perspective we can see the difference between voiced and unvoiced speech by noticing that the envelope of voiced speech is at higher in amplitude. We then focus on wa and finally /a/ where now we can see the periodicity and the pitch of the signal. After this we turn our attention to the frequency spectrum of the signal. We calculate the frequency resolution of DFTs and consider the possibility of inducing aliasing as a result of a low number of samples. Finally we consider the effects of over sampling and increasing frequency resolution by adding zeros to the end of our sample to increase the number of points in the DFT.
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20091ee114_1_CA1_Solutions - UCLA Dept. of Electrical...

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