cngupdate.m

来自「ITU-T G.723.1 Speech Coder: Matlab imple」· M 代码 · 共 18 行

function SIDGain = CNGUpdate (eMem, CNGpar)
% Calculate the gain for future CNG frames (in case an SID frame is
% lost)

% $Id: CNGUpdate.m 1.2 2004/08/07 G.723.1-v2r1a $

% Gain for CNG
N = CNGpar.NG;
E = eMem(end-N+1:end)' * eMem(end-N+1:end);
SIDGain = CNGpar.GScale * sqrt (E);
  
% Quantize / Decode SIDGain
QI = QuantL (SIDGain, CNGpar.GainDec);
SIDGain = CNGpar.GainCBook (QI + 1);
GainT = SIDGain;

return