Frame erasure concealment using sinusoidal analysis-synthesis and its application to MDCT-based codecs

Abstract

This paper presents a frame erasure concealment algorithm based on sinusoidal analysis-synthesis and its application to MDCT-based codecs. When a frame is lost, sinusoidal analysis of the previously decoded and buffered signal is performed. The analysis gives a set of sinusoids, which are used to synthesize the waveform corresponding to the lost frame. When applied to an MDCT-based codec, the algorithm exploits the MDCT windowing and overlap-add synthesis mechanism to improve waveform synthesis in the lost frame. At frame erasure rates up to 10%, this algorithm significantly improves perceptual quality of the decoder output.