Abstract
In voiced speech segments, natural noise is the sum of modulation noise due to the irregularly vibratory patterns of the vocal folds, and additive noise due to the air stream in a glottal chink. The noise content can be evaluated by the signal-to-noise ratio (SNR). The first section of the paper reviews the various time and frequency domain SNR measurement techniques. In the second section, a new SNR measurement technique is introduced, which approximates the harmonic content of speech wave spectra by means of a spectral synthesis-by-analysis algorithm. In the final section, the technique presented is employed to perform SNR measurements on synthetic vowels, and normal and pathological voice signals. The SNR measurement only allows a rough screening with respect to the disorder. The problems involved in the measurement of noise are discussed.
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