Definition of the Opus Audio Codec

Metadata

Publisher: IETF
Doc Type: Standard
Pages: 326
Abstract: This document defines the Opus interactive speech and audio codec. Opus is designed to handle a wide range of interactive audio applications, including Voice over IP, videoconferencing, in-game chat, and even live, distributed music performances. It scales from low bitrate narrowband speech at 6 kbit/s to very high quality stereo music at 510 kbit/s. Opus uses both Linear Prediction (LP) and the Modified Discrete Cosine Transform (MDCT) to achieve good compression of both speech and music. [STANDARDS-TRACK]
Publication Date: 2012-09-01
Status Note: Proposed Standard
DOI: 10.17487/RFC6716
Link: https://doi.org/10.17487/RFC6716
Author(s): Jean-Marc Valin
Koen Vos
Timothy B. Terriberry
Keyword(s): Voice, Music, Lossy Compression, VoIP

Latest version of IETF RFC 6716

Document Versions — IETF RFC 6716

▶ IETF RFC 6716 (2012-09-01)

THIS DOC [ACTIVE] [LATEST VERSION]

Amended by:

RFC8251 NOT IN REGISTRY

Normative Reference(s)

IETF RFC 2119 [Active*]

Bibliographic Reference(s)

Princen, J. and A. Bradley, "Analysis/Synthesis Filter Bank Design Based on Time Domain Aliasing Cancellation", IEEE Trans. Acoustics, Speech, and Siginal Processing, ASSP-34 (5), pp. 1153-1161, October, 1986. EXTERNAL
Wikipedia, "Range Coding", < http://en.wikipedia.org/w/ index.php?title=Range_encoding&oldid=509582757 >. EXTERNAL
Wikipedia, "Fast Fourier Transform", < http://en.wikipedia.org/w/ index.php?title=Fast_Fourier_transform&oldid=508004516 >. EXTERNAL
Pasco, R., "Source coding algorithms for fast data compression", Ph.D. thesis Dept. of Electrical Engineering, Stanford University, May 1976. EXTERNAL
Wikipedia, "Hadamard Transform", < http://en.wikipedia.org/ w/index.php?title=Hadamard_transform&oldid=508252957 >. EXTERNAL
"Google NetEQ code", < http://code.google.com/p/webrtc/ source/browse/trunk/src/modules/audio_coding/NetEQ/main/ source/?r=583 >. EXTERNAL
Burg, J., "Maximum Entropy Spectral Analysis", Proceedings of the 37th Annual International SEG Meeting, Vol. 6, 1975. EXTERNAL
Wikipedia, "Z-transform", < http://en.wikipedia.org/w/ index.php?title=Z-transform&oldid=508392884 >. EXTERNAL
Zwicker, E., "Subdivision of the Audible Frequency Range into Critical Bands", The Journal of the Acoustical Society of America, Vol. 33, No 2 pp. 248, February 1961. EXTERNAL
"Vorbis website", < http://xiph.org/vorbis/ >. EXTERNAL
"Opus Testvectors (website)", < http://opus-codec.org/testvectors/ >. EXTERNAL
Wikipedia, "Viterbi Algorithm", < http://en.wikipedia.org/ w/index.php?title=Viterbi_algorithm&oldid=508835871 >. EXTERNAL
"Opus website", < http://opus-codec.org/ >. EXTERNAL
Laroia, R., Phamdo, N., and N. Farvardin, "Robust and Efficient Quantization of Speech LSP Parameters Using Structured Vector Quantization", ICASSP-1991, Proc. IEEE Int. Conf. Acoust., Speech, Signal Processing, pp. 641- 644, October 1991. EXTERNAL
Vos, K., Jensen, S., and K. Sorensen, "SILK Speech Codec" , Work in Progress, September 2010. EXTERNAL
"Opus Git Repository", < https://git.xiph.org/opus.git >. EXTERNAL
Wikipedia, "Line Spectral Pairs", < http:// en.wikipedia.org/w/ index.php?title=Line_spectral_pairs&oldid=365426016 >. EXTERNAL
"Matroska website", < http://matroska.org/ >. EXTERNAL
Valin, JM., Terriberry, T., Maxwell, G., and C. Montgomery, "Constrained-Energy Lapped Transform (CELT) Codec", Work in Progress, July 2010. EXTERNAL
Martin, G., "Range encoding: An algorithm for removing redundancy from a digitised message", Proc. Institution of Electronic and Radio Engineers International Conference on Video and Data Recording, 1979. EXTERNAL
Wikipedia, "Modified Discrete Cosine Transform", <http:// en.wikipedia.org/w/ index.php?title=Modified_discrete_cosine_ transform&oldid=490295438>. EXTERNAL
Wikipedia, "White Noise", < http://en.wikipedia.org/w/ index.php?title=White_noise&oldid=497791998 >. EXTERNAL
"Opus Testvectors (proceedings)", < http://www.ietf.org/ proceedings/83/slides/slides-83-codec-0.gz >. EXTERNAL
Valin, JM., Terriberry, T., Montgomery, C., and G. Maxwell, "A High-Quality Speech and Audio Codec With Less Than 10 ms Delay", IEEE Trans. on Audio, Speech, and Language Processing, Vol. 18, No. 1, pp. 58-67 2010. EXTERNAL
Kabal, P. and R. Ramachandran, "The Computation of Line Spectral Frequencies Using Chebyshev Polynomials", IEEE Trans. Acoustics, Speech, Signal Processing, Vol. 34, no. 6, pp. 1419-1426, December 1986. EXTERNAL
Le Roux, J. and C. Gueguen, "A fixed point computation of partial correlation coefficients", ICASSP-1977, Proc. IEEE Int. Conf. Acoustics, Speech, and Signal Processing, pp. 257-259, June 1977. EXTERNAL
Fischer, T., "A Pyramid Vector Quantizer", IEEE Trans. on Information Theory, Vol. 32, pp. 568-583, July 1986. EXTERNAL
"Google WebRTC code", < http://code.google.com/p/webrtc/ >. EXTERNAL
"Valgrind website", < http://valgrind.org/ >. EXTERNAL
Wikipedia, "Linear Prediction", < http://en.wikipedia.org/ w/index.php?title=Linear_prediction&oldid=497201278 >. EXTERNAL
RFC3533 — RFC3533 EXTERNAL
IETF RFC 3550 [Active*]
IETF RFC 4732 [Active*]
RFC6366 — REQUIREMENTS EXTERNAL
IETF RFC 6562 [Active*]

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Referenced By

Open-Source Spatial Audio Compression for VR Content [Active]
IETF RFC 6973 [Active*]