DETECTION OF DEFECTIVE SPEECH FRAMES IN A RECEIVER OF A DIGITAL SPEECH COMMUNICATION SYSTEM

摘要

The invention relates to a method for detecting defective speech frames in areceiver of a speech communication system. A coded speech signal (200)consisting of speech frames conveying speech coding parameters is receivedthrough a transmission link. In the invention, the detection method (206) fordefective speech frames is dependent on the quality of the transmission link.If the quality (210) of the transmission link is "poor", unusual parametervalues of a speech signal in a speech frame are interpreted as transmissionerrors, and the speech frame is classified as defective. During a transmissionlink of "good" quality, all received parameter values possible for speech areaccepted and forwarded to a speech decoder (203). In the latter mode ofoperation, the detection of defective speech frames is solely based onconventional error detection methods (205) employed in the receiver.