Research on Speech Articulation in Classrooms Under Virtual Listening Environment

Abstract:

Speech articulation is the key point of research on classroom acoustics,and speech articulation testing is the most direct approach to decide whether the listening environments are superior or inferior.It is sometimes very difficult to find the required classrooms where factors of listening environment can be regularly changed.Virtual listening environment where reverberation time can be regularly changed can be fabricated by applying exponent attenuation to the signal of actural classroom,so does signal to noise ratio by intermingling noise with the dead signal obtained in anechoic room.Speech articulation tests were done in those virtual listening environments,and then the optimal reverberation time in mid frequencies and minimal signal to noise ratio can be obtained by analyzing the variance of articulation index scores.Results prove that research on speech articulation in classrooms by fabricating virtual listening environment is applicable.