Fig. 3From: Autocorrelation-based noise subtraction method with smoothing, overestimation, energy, and cepstral mean and variance normalization for noisy speech recognitionSample autocorrelation sequences of the clean speech, noisy speech, and noise as well as sum of the autocorrelations of clean speech signal and noise with a babble noise and b factory noise, with an SNR of 10Â dBBack to article page