US 8,015,000 B2 · Classification-based frame loss concealment for audio signals

Abstract

An audio decoding system performs frame loss concealment (FLC) when portions of a bit stream representing an audio signal are lost within the context of a digital communication system. The audio decoding system employs two different FLC methods: one designed to perform well for music, and the other designed to perform well for speech. When a frame is deemed lost, the audio decoding system analyzes a previously-decoded audio signal corresponding to previously-decoded frames of an audio bit-stream. Based on the results of the analysis, the lost frame is classified as either speech or music. Using this classification, other signal analysis, and knowledge of the employed FLC methods, the audio decoding system selects the appropriate FLC method which then performs FLC on the lost frame.

Claims16

Dependent claims

A method for performing frame loss concealment (FLC) in an audio decoder, comprising:

performing a first analysis on a previously-decoded portion of an audio signal, wherein performing the first analysis includes generating a feature set, wherein the feature set includes at least a short-term speech likelihood measure and a long-term speech likelihood measure;
classifying a lost frame as either speech or music based on the results of the first analysis;
performing a second analysis on the previously-decoded portion of the audio signal, wherein performing the second analysis comprises using at least the short-term speech likelihood measure and the long-term speech likelihood measure;
and
selecting either a first FLC technique or a second FLC technique for replacing the lost frame based on the classification and the results of the second analysis.

2 more elements

Dependencies are inferred from the claim text.

Classification-based frame loss concealment for audio signals

Life of this patent

Classification-based frame loss concealment for audio signals

Life of this patent

Abstract

Claims16