www.pudn.com > LPC.rar > speechcoder1.m

function [ outspeech ] = speechcoder( inspeech ) 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
% 
% EE214A - Digital Speech Processing - Class Project, Winter 2002 
% 
% Speech Coding using Linear Predictive Coding (LPC) 
% The desired order can be selected in the system constants section. 
% For the excitation impulse-trains are used. The result does not sound very 
% well but with this solution it is possible to achieve a low bitrate! 
% 
% Author: Philipp Steurer, 03/04/2002 
% 
% Parameters:  
% inspeech : wave data with sampling rate Fs 
% (Fs can be changed underneath if necessary) 
%  
% Returns: 
% outspeech : wave data with sampling rate Fs 
% (coded and resynthesized) 
% 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
% 
% arguments check 
% --------------- 
if ( nargin ~= 1) 
error('argument check failed'); 
end; 
% 
% system constants 
% ---------------- 
Fs = 16000; % sampling rate in Hertz (Hz) 
Order = 10; % order of the model used by LPC 
% 
% main 
% ---- 
% encoded the speech using LPC 
[aCoeff, resid, pitch, G, parcor, stream] = proclpc(inspeech, Fs, Order); 
% decode/synthesize speech using LPC and impulse-trains as excitation 
outspeech = synlpc1(aCoeff, pitch, Fs, G);