Mineo Tsushima

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This paper proposes a recovery method of broadband speech form narrowband speech based on piecewise linear mapping. In this method, narrowband spectrum envelope of input speech is transformed to broadband spectrum envelope using linearly transformed matrices which are associated with several spectrum spaces. These matrices were estimated by speech training(More)
A scalable codec has been constructed by using transform coding and the basic modules for scalable encoder and decoder. It allows users to choose a variety of scalable configrations in the frequency domain. The basic module is a quantizer that can quantize MDCT (Modified DCT)[1] coefficients transformed from a variety of frequency regions. This module(More)
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