Low-complexity packet loss concealment method for voice-over-IP speech transmission

An apparatus for performing packet loss concealment in a packet-based speech communication system, the apparatus comprising a processor adapted to:

• receive one or more speech packets comprising speech data, the speech data comprising a sequence of speech data samples;
• identify the loss of a speech packet comprising speech data subsequent to the speech data comprised in said one or more received speech packets;
• determine a pitch period of said speech data comprised in said one or more received speech packets by performing a plurality of cross-correlation operations on said received speech data samples, each of said cross-correlation operations being performed on a subset of said received speech data samples comprising less than all of said speech data samples, each of said subsets of speech data samples being selected from said all of said speech data samples with use of a tap interval;
• adjust said tap interval based on a difference between a first one of said cross-correlation operations and a second one of said cross-correlation operations;
• and
• generate speech data for said lost speech packet based on said speech data samples comprised in said one or more received speech packets, and further based on said determined pitch period.