Robust speech coding under packet-loss conditions using recovery sub-codec for broad-band IP network

Toru Morinaga*, Shigeaki Sasaki, Kazunori Mano, Takao Kaneko

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


A speech-coding method called "recovery sub-code (RSC)" is described that improves speech quality under packet-loss conditions, which can occur even in high-speed wide-band networks. The RSC uses a sub bit-stream as additional information in the next speech frame in addition to the main bit-stream in the current frame. The main bit-stream is coded using a low-compression high-quality main coder and the sub bit-stream is coded using a high-compression sub-coder. The internal states of the recovery sub-coder can be updated using the output from the high-quality main coder, so they are independent of previous frames and are not affected by previous packet loss. Subjective quality tests of several speech codecs based on the proposed method show that it significantly improves the concealment of packet loss, both for narrow- and wide-band speech and audio signals.

Original languageEnglish
Pages (from-to)III/2713-III/2716
JournalICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Publication statusPublished - 2002
Externally publishedYes
Event2002 IEEE International Conference on Acoustic, Speech, and Signal Processing - Orlando, FL, United States
Duration: 2002 May 132002 May 17

ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering


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