In this paper, a hybrid transform method for analysis/synthesis and coding of speech signals is proposed. A finite number of Fourier functions is used to represent frame-by-frame the selective (narrow-band) components of speech. The broadband residual is characterized by a small number of Walsh functions. An iterative algorithm, to determine the frequency and sequency components in a systematic manner, is derived. This is employed for speech coding at 16 kbit/s and 9.6 kbit/s. The hybrid transform method produces natural sounding speech which is indistinguishable from the original at 16 kbit/s and highly intelligible at 9.6 kbit/s.
ASJC Scopus subject areas
- Control and Systems Engineering
- Signal Processing
- Computer Vision and Pattern Recognition
- Electrical and Electronic Engineering