Fig. 3From: Physical task stress and speaker variability in voice qualityEquipment used for physical task stress speech data collection: (i) Conversion II Elliptical/Stepper, (ii) digital screen display for Stepper, (iii) Shure Beta 53 close-talking microphone, (iv) Sennheiser HD 650 open air headphones, (v) Tascam US-1641 multi-channel digital recorderBack to article page