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US Patent 8392179 Multimode coding of speech-like and non-speech-like signals

Patent 8392179 was granted and assigned to Dolby Laboratories on March, 2013 by the United States Patent and Trademark Office.

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Patent
Patent

Patent attributes

Current Assignee
Dolby Laboratories
Dolby Laboratories
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
8392179
Patent Inventor Names
Robert Andersen3
Grant Davidson3
Regunathan Radhakrishnan3
Rongshan Yu3
Date of Patent
March 5, 2013
Patent Application Number
12921752
Date Filed
March 12, 2009
Patent Citations Received
‌
US Patent 12027175 Transform encoding/decoding of harmonic audio signals
1
‌
US Patent 11887612 LPC residual signal encoding/decoding apparatus of modified discrete cosine transform (MDCT)-based unified voice/audio encoding device
2
Patent Primary Examiner
‌
Douglas Godbold
Patent abstract

The invention relates to the coding of audio signals that may include both speech-like and non-speech-like signal components. It describes methods and apparatus for code excited linear prediction (CELP) audio encoding and decoding that employ linear predictive coding (LPC) synthesis filters controlled by LPC parameters, a plurality of codebooks each having codevectors, at least one codebook providing an excitation more appropriate for non-speech-like signals and at least one codebook providing an excitation more appropriate for speech-like signals, and a plurality of gain factors, each associated with a codebook. The encoding methods and apparatus select from the codebooks codevectors and/or associated gain factors by minimizing a measure of the difference between the audio signal and a reconstruction of the audio signal derived from the codebook excitations. The decoding methods and apparatus generate a reconstructed output signal from the LPC parameters, codevectors, and gain factors.

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