Method for extending the spectral bandwidth of a speech signal

摘要

The present invention relates to a method for extending the spectral bandwidth of an excitation signal of a speech signal, comprising the following steps:
- determining a bandwidth limited excitation signal of the speech signal,
- applying a nonlinear function to the excitation signal for generating a bandwidth extended excitation signal
wherein the nonlinear function is the following quadratic function: x Ü anr , i n = c 2 n �¢ x 2 p , i n + c 1 n �¢ x p , i n c1, and c2 being determined in such a way, that c 1 n = K 1 - x max n �¢ c 2 n = K 1 - x max �¢ K 1 - K 2 x max n - x min n + µ c 2 n = K 1 - K 2 x max n - x min n + õ .