LPC Methods Slides

LPC Methods Slides - Linear Predictive Coding Methods ECE...

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Linear Predictive  Coding Methods ECE 5525 By: Mohamed M. Eljhani Fall 2010
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LPC Methods 2 02/13/12 Problem Description The main purpose of this project is to show the different  between three linear predictive methods by implementing a  MATLAB program that convert from a frame of speech to a set  of linear Prediction coefficients, using three basic methods, i.e. Auto-correlation Method. Covariance Method. Lattice Method.                                                                                                 Plot LPC spectra from the three methods along with the  normal spectrum from the Hamming window weighted frame. 
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LPC Methods 3 02/13/12 Using the same parameters N =400, p =12, with Hamming  Window weighting for the three methods, to show the different  between three methods. Using the file  ah.wav       to get a vowel steady state sound  beginning at sample 3000, and the file  test 16k.wav       to  get a fricative beginning at sample 3000.  Covariance and lattice methods  – preserved p samples  before the starting sample at n =3000 for computing  correlations, and error signals. Autocorrelation Method   – assumes that speech samples  are zero outside the interval.
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LPC Methods 4 02/13/12 Introduction     What is the Linear Predictive Coding means ?            Linear predictive coding (LPC) is defined as a digital method for         encoding an analog signal in which a particular value is predicted       by a linear function of the past values of the signal.            Human speech is produced in the vocal tract which can be         approximated as a variable diameter tube. The linear predictive       coding (LPC) model is based on   a mathematical approximation of       the vocal tract represented by this tube of a varying diameter. At       a particular time t, the speech sample s(t) is represented as a       linear sum of the p previous samples. The most important aspect       of LPC is the  linear predictive filter  which allows the value of the       next sample to be determined by a linear combination of previous       samples.
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LPC Methods 5 02/13/12 LPC Algorithm  The general algorithm for linear predictive coding involves:  An analysis or encoding part . A synthesis or decoding part . In the encoding, LPC takes the speech signal in blocks or frames of 
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This note was uploaded on 02/11/2012 for the course ECE 5525 taught by Professor Staff during the Fall '10 term at FIT.

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LPC Methods Slides - Linear Predictive Coding Methods ECE...

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