Abstract
It is usual to plot the short-term speech power-spectrum envelope using nonlinear coordinates such as level vs log frequency, or other coordinates related to the way that a signal is perceived. The technique presented here involves the expansion of the spectrum envelope (described by nonlinear coordinates) in terms of a set of convenient orthonormal functions. The method is, related, but not identical, to the one employed by Pirogov in the harmonic vocoder and Schroeder in the autocorrelation vocoder. It can be conveniently incorporated in present speech-compression and -recognition systems. Results of a preliminary computer simulation are presented. Fourier series expansions were tried, but other orthonormal expansions, such as Laguerre and Tchebicheff polynomials, and orthonormal exponentials are also appropriate.
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