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Unformatted text preview: UCLA Dept. of Electrical Engineering EE 114, Winter 2011 Computer Assignment 2: Frequency and Time Analysis of Speech Due: January 19, 2011 Introduction : The goal of this assignment is to learn the purpose of pre-emphasis fllters in speech analysis. Additionally, this assignment includes the estimation of speech signal parameters, such as formant frequencies and pitch period, in the frequency and time domains. Pre-emphasis Filters : Pre-emphasis fllters are commonly used in speech processing applications to boost high frequency components, since such components may be low energy yet contain important discriminative infor- mation. The general form of pre-emphasis fllters in the time domain is: y ( n ) = x ( n ) ¡ ax ( n ¡ 1) ; (1) where a is a parameter between 0 and 1, usually set closer to 1. To display the frequency response of a pre-emphasis fllter, type: freqz([1 -a],1); where a is the chosen parameter. A flgure should appear displaying the magnitude and phase response of the given fllter. Note that the parameters of the "freqz" command are the feed-forwardresponse of the given fllter....
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