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A Two- or Three-Stage Bit-Rate Scalable Audio Coding System

While there are no scalable audio coding systems known today in ISO MPEG, scalability now is an important requirement to support the new functionalities of MPEG-4. Scalability, in general, allows a subset of the bitstream to be decoded into a useful signal. This paper describes a two- and three-stage bit-rate scalable audio codec that combines speech coding and perceptual audio coding techniques with a specially adapted psychoacoustic model.

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