HIERARCHICAL ENCODING/DECODING DEVICE
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Abstract
A system for coding a hierarchical audio signal, comprising, at least, a core layer using parametric coding by analysis by synthesis in a first frequency band, a band extension layer for widening said first frequency band into a second frequency band, or wideband. The system also comprises a wideband audio coding quality enhancement layer based on transform coding using a spectral parameter obtained from said band extension layer. Application to transmitting speech and/or audio signals over packet networks.
96 Citations
37 Claims
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1-21. -21. (canceled)
- 22. A system for coding a hierarchical audio signal, comprising, at least, a core layer using parametric coding by analysis by synthesis in a first frequency band, a band extension layer for widening said first frequency band into a second frequency band, or wideband, characterized in that said system also comprises a wideband audio coding quality enhancement layer based on transform coding using a spectral parameter obtained from said band extension layer.
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29. A method for coding an audio signal, comprising the steps of:
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coding an original signal in a first frequency band; coding the original signal in an extension of the first frequency band; calculating a residual signal from the original signal and the signals obtained from the preceding coding operations; and producing an audio coding quality enhancement layer using transform coding, said transform coding of said residual signal using a spectral parameter obtained from the said extension of the first frequency band. - View Dependent Claims (30, 31, 32, 33)
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34. A hierarchical audio coder, comprising:
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a core coder (603) using parametric coding by analysis by synthesis, adapted to code an original signal in a first frequency band; a coding stage in an extension of the first frequency band; a stage for calculating a residual signal from the original signal and the signals obtained from the preceding coding stages; and a wideband audio coding quality enhancement stage by transform coding including an inverse transform using a spectral parameter obtained from the said extension of the first frequency band. - View Dependent Claims (35, 36, 37)
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Specification