getgainrange.m

来自「ITU-T G.723.1 Speech Coder: Matlab imple」· M 代码 · 共 25 行

function NgVal = GetGainRange (LL, LU, SineDet, Tamepar)
% Calculate the number of entries in the pitch filter gain codebooks
% to be used for the pitch predictor. An "error" value is available
% every ISub samples.

% $Id: GetGainRange.m 1.2 2004/08/25 G.723.1-v2r1a $

jU = fix (LU / Tamepar.ISub);
jL = fix (max (LL, 1) / Tamepar.ISub);

EMax = max (Tamepar.E(jL+1:jU+1));
if (EMax > Tamepar.EThr | SineDet ~= 0)
    iTest = 0
else
    iTest = Tamepar.EThr - EMax;
end

NCBook = length (Tamepar.NgVMin);
for (i = 1:NCBook)
  NgVMax = length (Tamepar.g{i});
  NgVal(i) = min (Tamepar.NgVMin(i) + iTest * Tamepar.Nx(i), NgVMax);
end

return