gusucode.com > 信号处理工具箱 - signal源码程序 > signal\signal\signal\lar2rc.m
function k = lar2rc(g) %LAR2RC Convert log area ratios to reflection coefficients. % K = LAR2RC(G) returns the reflection coefficients, K, based on the % log area ratios, G. % % See also RC2LAR, POLY2RC, AC2RC, IS2RC. % References: % [1] J. Makhoul, "Linear Prediction: A Tutorial Review," Proc. IEEE, % Vol.63, No.4, pp.561-580, Apr 1975. % [2] ITU-T Recommendation G.729 (03/96) % % Author(s): A. Ramasubramanian % Copyright (c) 1988-98 by The MathWorks, Inc. % $Revision: 1.1 $ $Date: 1998/07/24 16:12:13 $ if ~isreal(g), error('Log area ratios must be real.'); end % Use the relation, tanh(x) = (1-exp(2x))/(1+exp(2x)) k = -tanh(-g/2); % [EOF] lar2rc.m