mulawdecode.m

linear time－frequency toolbox

function sig = mulawdecode(codedsig,mu,sigweight);
%MULAWDECODE  Inverse of Mu-Law companding
%   Usage:  sig = mulawdecode(codedsig,mu,sigweight);
%
%   MULAWDECODE(codedsig,mu,sigweight) inverts a previously
%   applied mu-law companding to the signal codedsig. The parameters
%   mu and sigweight must match those from the call to MULAWENCODE
%  
%   REFERENCES:
%     S. Jayant and P. Noll. Digital Coding of Waveforms: Principles and
%     Applications to Speech and Video. Prentice Hall, 1990.

% Author: Bruno Torresani and Peter Soendergaard

error(nargchk(3,3,nargin));

% Handle ND-arrays and matrices by converting the input array to
% a vector.
remembershape=size(codedsig);
codedsig=codedsig(:);

cst = (1+mu);
sig = cst.^(abs(codedsig));
sig = sign(codedsig) .* (sig-1);
sig = sig * sigweight/mu;

% Restore the original shape.
sig=reshape(sig,remembershape);