Code-excited linear prediction: Difference between revisions

Revision as of 17:53, 2 January 2017

Revision as of 18:41, 12 August 2017

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* Using the [[source-filter model of speech production]] through [[linear prediction]] (LP) (see the textbook "speech coding algorithm");

* Using an adaptive and a fixed codebook as the input (excitation) of the LP model;

* Performing a search in closed-loop in a “perceptually"perceptually weighted ___domain”___domain".

* Applying [[vector quantization]] (VQ)

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==See also==

* [[MPEG-4 Part 3]] (CELP as an MPEG-4 Audio Object Type)

* [[G.728]] -– Coding of speech at 16 kbit/s using low-delay code excited linear prediction

* [[G.718]] -– uses CELP for the lower two layers for the band (50–6400 Hz) in a two-stage coding structure

* [[G.729.1]] -– uses CELP coding for the lower band (50–4000 Hz) in a three-stage coding structure

* [[Comparison of audio coding formats]]

* [[CELT]] is a related audio codec that borrows some ideas from CELP.

==References==

* B.S. Atal, "The History of Linear Prediction," ''IEEE Signal Processing Magazine'', vol. 23, no. 2, March 2006, pp. 154–161.

* M. R. Schroeder and B. S. Atal, "Code-excited linear prediction (CELP): high-quality speech at very low bit rates," in ''Proceedings of the IEEE [[International Conference on Acoustics, Speech, and Signal Processing]]'' (ICASSP), vol. 10, pp. 937–940, 1985.

==External links==

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* [http://www.speech.cs.cmu.edu/comp.speech/Section3/Software/celp-3.2a.html reference implementations] of CELP 1016A (CELP 3.2a) and LPC 10e.

* [http://www.otolith.com/otolith/olt/lpc.html Linear Predictive Coding (LPC)]

=== Selected readings ===

* [http://www.speex.org/docs/manual/speex-manual/node9.html Introduction to CELP Coding]

* [http://cnx.org/content/m10482/latest/ Speech Processing: Theory of LPC Analysis and Synthesis]

==References==

* B.S. Atal, "The History of Linear Prediction," ''IEEE Signal Processing Magazine'', vol. 23, no. 2, March 2006, pp. 154–161.

* M. R. Schroeder and B. S. Atal, "Code-excited linear prediction (CELP): high-quality speech at very low bit rates," in ''Proceedings of the IEEE [[International Conference on Acoustics, Speech, and Signal Processing]]'' (ICASSP), vol. 10, pp. 937–940, 1985.

{{Compression Methods}}

{{Compression formats}}