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MDc and JITc as computed by AMPEX, for seven levels of period perturbation (jitter) ‘put in’ with two levels of additive noise. The levels of jitter put in are: 2.8, 5.1, 9.7, 14.3, 18.9, 25.7 and 30.72%. The two levels of additive pulsed noise are 17 and 23 dB signal-to-noise ratio at the glottis
