Correcting the use of ensemble averages in the calculation of harmonics to noise ratios in voice signals (L).
A correcting formula for the estimation of harmonics-to-noise ratios (HNR) based on ensemble-averaging techniques is derived. The original method yields a biased approximation which is more accurate as the number of averaged pulses (N) increases. However, the method treats gradual waveform changes incorrectly as noise, which is worsened for large values of N. The obtained formula allows the use of as few averaged pulses as desired, while allowing the complete removal of the bias from the estimate of HNR.
Ferrer
Carlos A
CA
Center of Studies of Electronics and Information Technologies, Central University of Las Villas, C. Camajuaní, Km 5 1/2 Santa Clara, 54800 Cuba.
González
Eduardo
E
Hernández-Díaz
María E
ME
D000465:Algorithms; D006801:Humans; D008432:Mathematical Computing; D013061:Speech Acoustics; D014831:Voice