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. 2017 Jun 15;141(6):4452–4465. doi: 10.1121/1.4985186

FIG. 2.

FIG. 2.

(Color online) Stimulus waveforms (upper half of plot) and level distributions (lower half) for unprocessed (UNP) signals, shown on left, and EEQ signals, shown on right, depicting the utterance /ɑ/-/p/-/ɑ/ (produced by a male talker) at a level of 70 dB SPL in four different noise backgrounds. In each half of the plot, the rows represent speech in (a) the baseline (BAS) condition with a continuous-noise background of 30 dB SPL, i.e., speech-to-noise ratio (SNR) of +40 dB, (b) continuous (CON) noise with SNR of −10 dB, (c) square-wave interrupted (SQW) noise with SNR of −10 dB, and (d) sinusoidally amplitude-modulated (SAM) noise with SNR of −10 dB. The level distribution histograms were derived from sampling the waveform at a rate of 32 kHz, converting the samples to dB, and generating a histogram of unit bin size with normalized probabilities. The dashed vertical bar indicates the rms level of each of the signals; the solid vertical bar indicates the median of the level distribution.