Abstract
Equal loudness contours for pure tones with speech as the reference stimulus were established through an alternate monaural loudness balance procedure. Untrained subjects compared the loudness of a nonmeaningful sentence presented at 10, 30, 50, 70, and 85 dB sensation levels (re: speech detection threshold) to the loudness of six pure tones in the octave test frequency range, 250–8000 Hz. The speech levels and the pure tone frequencies were randomized during the presentation. The results suggest: (1) a similar shape for the contours plotted in terms of sensation level and hearing threshold level in contrast to the contours based on sound pressure level (SPL), (2) a different shape for SPL based contours when compared to the classical pure tone equal loudness contours, and (3) a spread of loudness matches which varied with pure tone frequency and speech presentation level. A discussion of the results will be presented.
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