“Speaker’s comfort and voice health in classrooms” project shows speakers adjust their voices to other acoustic cues than only loudness.

The indirect auditory feedback from one's own voice arises from sound reflections at the room boundaries or from sound reinforcement systems. The relative variations of indirect auditory feedback are quantified through room acoustic parameters such as the room gain and the voice support, rather than the reverberation time. Variation in voice level is induced by the acoustic environment as a consequence of the sidetone compensation or Lombard effect. In the range of typical rooms for speech, the variations in overall voice level that result in a constant autophonic level are on the order of 2 dB, and more than 3 dB in the 4 kHz octave band. By comparison of these curves with previous studies, it is shown that talkers use acoustic cues other than loudness to adjust their voices when speaking in different rooms. This research has been partially funded by the Swedish organization AFA Försäkring as a part of the project “Speaker's comfort and voice health in classrooms. 

Source: Equal autophonic level curves under different room acoustics conditions. David, Pelegrín-García, Oier Fuentes-Mendizábal, Jonas Brunskog, and Cheol-Ho Jeong; J.Acoust.Soc.Am., Volume 130, Issue 1, pp. 228-238 (2011); (11 pages). 

http://asadl.org/jasa/resource/1/jasman/v130/i1/p228_s1?isAuthorized=no

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