Patent ID: 7047187

Claim:
A method for concealing errors in an audio signal containing a compressed audio stream, comprising: digitally encoding the audio signal into a plurality of audio data packets representative of the audio signal; determining a perceptually tolerable distortion limit for said audio packets using an heuristic model for perceptual control; and altering a value of at least one said audio packet by an amount less than said perceptually tolerable distortion limit utilizing information representative of a different said audio data packet, wherein using the heuristic model includes selecting audio data packet indices having magnitudes above a predetermined threshold and modifying a plurality of the indices by a predetermined value, thereby affecting perceptual control when an original perceptual model employed to compress the compressed audio stream is not available, wherein a plurality of said audio packets are altered by an amount less than said perceptually tolerable distortion, each alteration utilizing information representative of a different said audio packet than the audio packet being altered.