Title :
A hybrid transform method for analysis/synthesis of speech
Author :
Spanias, Andreas S.
Author_Institution :
Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ, USA
Abstract :
A mixed Fourier/Walsh transform scheme for speech coding is proposed. A set of harmonically structured frequency components is used to represent narrowband components of speech. The broadband residual is characterized by a small number of sequency components. The frequencies and sequences of the transform components are determined by sampling the short-time Fourier and Walsh transforms, respectively. The magnitudes and phases of the Fourier components and the amplitudes of the Walsh components are determined using an iterative algorithm which is based on the Gauss-Seidel method. A vector quantization (VQ) scheme is developed to encode the frequency and the sequency components. Results and subjective evaluations are given for speech coding at 4.0 kbit/s
Keywords :
fast Fourier transforms; speech analysis and processing; speech coding; speech synthesis; transforms; vector quantisation; 4 kbit/s; Fourier/Walsh transform; Gauss-Seidel method; broadband residual; component magnitudes; component phases; harmonically structured frequency components; hybrid transform; iterative algorithm; narrowband components; sequency components; short-time Fourier transform; short-time Walsh transform; speech analysis; speech coding; speech synthesis; subjective evaluations; vector quantization; Fourier transforms; Frequency; Gaussian processes; Iterative algorithms; Narrowband; Sampling methods; Speech analysis; Speech coding; Speech synthesis; Vector quantization;
Conference_Titel :
Global Telecommunications Conference, 1991. GLOBECOM '91. 'Countdown to the New Millennium. Featuring a Mini-Theme on: Personal Communications Services
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-87942-697-7
DOI :
10.1109/GLOCOM.1991.188477
