Some acoustic effects of listening to noise on speech production.

An experiment was performed to corroborate earlier findings of a spectral shift in speech produced in 80 dB or greater noise, and to determine whether a spectral shift relative to quiet also occurs at 35‐ and 60‐dB white noise. Both speakers studied incrementally decreased spectral tilt (the amount of energy at low frequencies relative to high) with noise above 35 dB. Both speakers increased duration and average speech amplitude incrementally with each noise increase. One speaker steadily increased fundamental frequency, while the other speaker decreased it. Speech changes are discussed as possible compensations for a distorted sidetone.