IMPROVED FRAME ERASURE CONCEALMENT FOR PREDICTIVE SPEECH CODING BASED ON EXTRAPOLATION OF SPEECH WAVEFORM

摘要

A method and system are provided for synthesizing a number of corrupted frames output from a decoder (100) including one or more predictive filters. The corrupted frames are representative of one segment of a decoded signal (sq(n)) output from the decoder. The method comprises (202) determining a first preliminary time lag (ppfe1) based upon examining a predetermined number of samples of another segment of the decoded signal and determining a scaling factor (ptfe) associated with the examined number of samples when the first preliminary time lag (ppfe1) is determined. The method also comprises extrapolating one or more replacement frames based upon the first preliminary time lag (ppfe1) and the scaling factor (ptfe).