Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding

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Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis (in musical instruments G10H) > using predictive techniques > Vocoder architecture > Vocoders using multiple modes > Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding