Vocoders using multiple modes

Full Title

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

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• G10L 19/20 using sound class specific coding, hybrid encoders or object based coding
• G10L 19/22 Mode decision, i.e. based on audio signal content versus external parameters
• G10L 19/24 Variable rate codecs, e.g. for generating different qualities using a scalable representation such as hierarchical encoding or layered encoding