Patent ID: 8165128

Claim:
An apparatus, comprising: a receiver adapted to receive an audio signal comprising a plurality of packets including a set of B preceding packets correctly received before L lost packets which are not received and a subsequent packet Pc correctly received after the L lost packets; wherein the receiver includes an error concealment module adapted to conceal existence of the L lost packets in the received audio signal; wherein the error concealment module includes a time-expansion unit adapted to perform a time scale modification expansion processing operation which stretches a length of the correctly received B preceding packets in the received audio signal and stretches a length of the correctly received subsequent packet Pc in the received audio signal, so that the stretched B and Pc packets combined conceal existence of the L lost packets; wherein the error concealment module comprises a circuit adapted to frequency separate the audio signal into a first lower frequency band signal and a second higher frequency band signal, and wherein the time-expansion unit performs a first time scale modification expansion processing operation with first expansion parameters on the first lower frequency band signal and performs a second time scale modification expansion processing operation with second expansion parameters on the second higher frequency band signal; and further comprises a circuit adapted to combine results of the first and second time scale modification expansion processing operations.