20091ee114_1_CA2

20091ee114_1_CA2 - UCLA Dept of Electrical Engineering EE...

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UCLA Dept. of Electrical Engineering EE 114, Winter 2009 Computer Assignment 2: Frequency and Time Analysis of Speech Introduction : The goal of this assignment is to learn the purpose of pre-emphasis filters 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 filters 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 filters in the time domain is: y ( n ) = x ( x ) - 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 filter, type: freqz([1 -a],1); where a is the chosen parameter. A figure should appear displaying the magnitude and phase response of the given filter. Note that the parameters of the ”freqz” command are the feed-forward
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