NDLI: Scalable Speech Coding for IP Networks: Beyond iLBC

Content Provider	IEEE Xplore Digital Library
Author	Seto, K. Ogunfunmi, T.
Copyright Year	2006
Abstract	High quality speech at low bit rates makes code excited linear prediction (CELP) the dominant choice for a narrowband coding technique despite the susceptibility to packet loss. One of the few techniques which received attention after the introduction of CELP coding technique is the internet low bitrate codec (iLBC) because of inherent high robustness to packet loss. Addition of rate flexibility and scalability makes the iLBC an attractive choice for voice communication over IP networks. In this paper, performance improvement schemes of multi-rate iLBC and its scalable structure are proposed, and the proposed codec enhanced from the previous work is re-designed based on the subjective listening quality instead of the objective quality. In particular, perceptual weighting and the modified discrete cosine transform (MDCT) with short overlap in weighted signal domain are employed along with the improved packet loss concealment (PLC) algorithm. The subjective evaluation results show that the speech quality of the proposed codec is equivalent to that of state-of-the-art codec, G.718, under both a clean channel condition and lossy channel conditions. This result is significant considering that development of the proposed codec is still in early stage.
Sponsorship	IEEE Signal Processing Society
Starting Page	2337
Ending Page	2345
Page Count	9
File Size	1161353
File Format	PDF
ISSN	15587916
Volume Number	21
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Speech Codecs Bit rate Encoding Discrete cosine transforms Packet loss voice over Internet protocol (VoIP) Discrete cosine transform (DCT) internet low bitrate codec (iLBC) packet loss scalable coding speech coding
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Electrical and Electronic Engineering

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