Transform coded excitation for speech and audio coding

Details Transform coded excitation for speech and audio coding Transform coded excitation for speech and audio coding

G - Physics

10

L

G10L 19/02 (2006.01) G10L 19/00 (2006.01) G10L 5/02 (1990.01)

Patent

CA 2094780

ABSTRACT OF THE DISCLOSURE A method for coding speech is disclosed. This method, called TCX (Transform Coded Excitation), combines features of time domain techniques, such as CELP (Code-Excited Linear Prediction), with features of frequency-domain techniques, such as TC (Transform Coding), while avoiding their respective drawbacks. The invention preserves the principle of error minimization in the perceptually-weighted-speech(/audio) domain which is found in CELP along with techniques such as linear filtering and pitch prediction; yet, its circumvents the complexity of the CELP analysis-by-synthesis approach by using quantization. The invention also takes advantage of the efficient frequency-domain quantization techniques typical of TC, such as spectral decimation, flexible bit allocation as well as numerous forms of stored or algebraic vector quantization techniques. Yet, unlike TC, the invention avoids the framing problems that plague block transforming of continuous processes.

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