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Method and apparatus for efficient multiband celp wideband speech and music coding and decoding
| Details |
Inventors: Ubale, Anil Wamanrao; Gersho, Allen;
Assignee: The Regents of the University of California (Oakland, CA)
Primary Examiner: Hudspeth; David R.
Assistant Examiner: Smits; Talivaldis Ivars
Attorney, Agent or Firm: Merchant, Gould, Smith, Edell, Welter & Schmidt
A method of digitally compressing speech and music by use of multiple band ("multiband") fixed excitations stored in codebooks. The use of multiband fixed excitations, along with a coupling method for interconnecting the excitation codebooks and adaptive codebooks and for generating the composite excitation signal, improve the long-term and short-term prediction, and the use of voice-music classification allows the coding structure to be adapted to the statistical character of the audio signal. |
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DETAILED DESCRIPTION To minimize the limitations in the prior art described above, and to minimize other limitations that will become apparent upon reading and understanding the present specification, the present invention discloses a powerful and highly productive system and method for compressing and decompressing wideband speech and musical inputs.
The present invention solves the above-described problems by providing a low bit-rate (typically, 16 to 32 kbits/s) coding and decoding by using a multiple band approach that avoids many of the drawbacks of prior coders.
Speech and music processed by the present invention are very high quality.
These results are obtained in the present invention by use of multiple band ("multiband") fixed excitation, and a coupling method for interconnecting the excitation codebooks and for generating the composite excitation signal, improved long-term and short-term prediction, and the use of voice-music classification to allow the coding structure to be adapted to the statistical character of the audio signal.
A system in accordance with the principles of the present invention comprises an encoder and a decoder.
The encoder comprises a Linear Prediction Coefficient (LPC) Analyzer, a synthesis filter, weighting filters, a voice/music classifier, a multiband bank of codebooks, a coupling network, an adaptive codebook, and an error minimizer.
These elements are coupled together to produce an output of the encoder that accurately reproduces human speech and music patterns.
The decoder comprises a multiband bank of codebooks, a coupling network, an adaptive codebook, a synthesis filter, and a postfilter.
One object of the present invention is to accurately encode wideband speech and/or music.
Another object of the present invention is to accurately decode the encoded wideband speech and/or music.
Another object of the present invention is to accurately reproduce the original speech and/or music after the encoding and decoding processes.
These and various other advantages and features of novelty which characterize the invention are pointed out with particularity in the claims annexed hereto and form a part hereof
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