A voicing decision driven forward error correction scheme for voice over IP applications

This paper examines the performance of a new packet loss concealment (PLC) schemes under bursty loss conditions. We confirm that burst losses cause higher distortion than equal rates of single packet loss, and introduce a new Forward Error Correction (FEC) and PLC combination that reduces artifacts typical of PLC schemes. FEC informs the receiver of the pitch and voicing of lost speech, combined as a single metric. A new PLC scheme combines ideas of repetition and interpolation with new approaches made possible by FEC to create loss concealing speech. The performance of the new scheme is assessed through comparison with the existing standard, and the increase in bit rate incurred by FEC is quantified.