On the Measurement of the Loudness of Speech
Irwin W. Pollack · The Journal of the Acoustical Society of America · 1952
A previous paper discussed several experimental procedures for setting up scales of loudness for white noise and for pure tones. In general the results obtained by various procedures were reasonably similar. However, when a speech signal was used, large discrepancies were obtained. The present paper describes these results and presents a loudness scale for speech based upon the data available.