Patent ID: 6108623
Filing Date: 2000-08-22
Classification: G10L

Abstract:
A device for generating comfort noise for a speech encoding/decoding system, characterized in that said device comprises:an encoder having a parallel arrangement of:circuit means for determining an energy content of a current frame in an input signal to be transmitted by said speech encoding/decoding system, said input signal having successive frames of a predetermined length;a circuit for determining a spectral envelope of said current frame using linear predictive coding (LPC) analysis; andmeans for quantizing, encoding and transmitting said determined energy content and said spectral envelope, anda decoder having a series arrangement of:a circuit for generating Gaussian noise,a sub-assembly of two parallel-arranged gain definition channels coupled to an output of said circuit for generating Gaussian noise, a first channel of said two parallel-arranged gain definition channels receiving said determined energy content and said spectral envelope for processing said Gaussian noise, andan adder for adding output signals of the two parallel-arranged gain definition channels, an output of said adder providing the comfort noise frame which is reproduced by said speech encoding/decoding system in the absence of speech signals in each frame of a decoded signal.