Acoustical studies of the singing voice adapting to the acoustic environment

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The singing voice is affected by acoustic factors of the place to sing - we defined the acoustic environment. In order to sing with efficient vocalizattofl in every acoustic environment the singer's subjective sense for singing contributes to control of the singing voice. Through the following experiments we describe the adaptation of the singing voice to the acoustic environment.1. The subjective sense for singing and the singing voice : We experimented whether or not there were the objective difference between two kinds of singing voices given by a singer depending on two different subjective senses through (1) a questionnaire to listeners and (2) an observation of the larynx using a laryngeal fiber scope, and an acoustic analysis of these singing voices.The results showed that the subjective sense for singing caused changes to the shape of the larynx and to the timbre of the singing voice.2. The acoustic environment and the singing voice : Recording four singers' singing voices in three different acoustic environments, we investigated the adaptation of singing voice to the environments through (1) a questionnaire to four singers, (2) a questionnaire on recognition of the difference of their singing voices, and (3) an acoustic analysis of all singing voices of all singers.From the results of experiment (1) we found that all singers were affected by the acoustic environment, and they tried to adapt to each environment keeping various senses at the same time. The results of (2) and (3) showed it was more difficult for singers to control the pitch in the environment with too much echo.The results of these studies suggest that father study about relationship between the singing voice and the acoustic environment will be useful for learning and teaching singing.