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DSP Code Sharing > A-Law Compression - non uniform Quantization
A-Law Compression - non uniform Quantization
Language: Scilab
Processor: Not Relevant
Submitted by Senthilkumar R on Mar 24 2011
Licensed under a Creative Commons Attribution 3.0 Unported License
A-Law Compression - non uniform Quantization
This program is used to perform A-Law Compression
function [Cx,Xmax] = Alaw(x,A)
//Non-linear Quantization
//A-law: A-law nonlinear quantization
//x = input vector
//Cx = A-law compressor output
//Xmax = maximum of input vector x
Xmax = max(abs(x));
for i = 1:length(x)
if(x(i)/Xmax < = 1/A)
Cx(i) = A*abs(x(i)/Xmax)./(1+log(A));
elseif(x(i)/Xmax > 1/A)
Cx(i) = (1+log(A*abs(x(i)/Xmax)))./(1+log(A));
end
end
Cx = Cx/Xmax; //normalization of output vector
Cx = Cx';
endfunction
//Non-linear Quantization
//A-law: A-law nonlinear quantization
//x = input vector
//Cx = A-law compressor output
//Xmax = maximum of input vector x
Xmax = max(abs(x));
for i = 1:length(x)
if(x(i)/Xmax < = 1/A)
Cx(i) = A*abs(x(i)/Xmax)./(1+log(A));
elseif(x(i)/Xmax > 1/A)
Cx(i) = (1+log(A*abs(x(i)/Xmax)))./(1+log(A));
end
end
Cx = Cx/Xmax; //normalization of output vector
Cx = Cx';
endfunction
posted by Senthilkumar R Comments
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