Patent ID: 6144936
Filing Date: 2000-11-07
Classification: G10L,H03G,H04B

Abstract:
A method for substituting bad speech frames in a receiver of a digital communication system, the method comprising:carrying out a correct/defective classification for each received frame containing speech coding parameters,wherein if the frame is classified as defective, a substitution process is carried out prior to applying the frame to a speech decoder, in which process the parameters of the frame are substituted for other parameters, the synthesized speech is attenuated during the substitution process, upon attenuating speech synthesized in the substitution process, the output signal of the receiver is combined with a noise signal which, after the synthesized speech completely ends, indicates the ceasing of the speech synthesization, andwhen good speech frames are received following a bad speech frame, the output signal of the receiver is formed so that the portion of noise signal combined with it decreases in the summing process in proportion to the number of received successive good frames, until the output signal is finally formed solely on the basis of the speech coding parameters received from the transmission channel.