20111ee114_1_CA1_Solutions

20111ee114_1_CA1_Solutions - /a/ 5000 4000 3000 2000 1000 0...

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UCLA Dept. of Electrical Engineering EE 114, Winter 2011 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 difierence between voiced and unvoiced speech by noticing that the envelope of voiced speech is at higher in amplitude. We then focus on wa and flnally /a/ where now we can see the periodicity and the pitch period of the signal. After this we turn our attention to the frequency spectrum of the signal. We calculate the spacing between adjacent frequency bins of DFTs and consider the possibility of inducing aliasing as a result of a low number of samples. Finally we consider the efiects of over sampling and decreasing the spacing between adjacent frequency bins by adding zeros to the end of our sample to increase
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This note was uploaded on 05/21/2011 for the course EE 114 taught by Professor Vanschaar during the Spring '11 term at UCLA.

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20111ee114_1_CA1_Solutions - /a/ 5000 4000 3000 2000 1000 0...

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