The Study of Sound Measurement Based on Binaural Technique
Date Issued
2012
Date
2012
Author(s)
Tzeng, Chia-Haw
Abstract
With the demand of sound quality, single microphone recording has limited ability to build the true auditory sensation. Therefore, taking the feature of human hearing into account, binaural measurement technique plays an important role in these days. The shape of external ear can detect the source and direction of sound wave, and the Pinna effect shows the reason that the behavior of reflection and diffraction of incident acoustic wave will occur before transmitting into the ear canal. Masking effect of head provide the ability of direction identification of sound source. Both provides diversity of hearing sense in acoustic field.
In this study, a simplified external ear geometry model based on binaural recording technology was designed. The characteristic of frequency response of fundamental ear like shape were investigated by means of finite element method and boundary element method. Moreover, two simplified external ear models were tested according to the frequency weighting method and the result was compared with Artifical Head in the Anechoic Chamber.
The experiment result of frequency response of simplified ear model comparing with head acoustic has good agreement with simulation results by SYSNOISE. The frequency response and BEM simulation agreed with measurement. The result shows that simplified out ear model could represent the head and ear system in the loudness experiment. The model has basic ability to do identification of sound direction, nevertheless, the frequency response at the resonance frequency is larger than measured result of head acoustic. The asymmetric geometry and different materials will be adapted for the simplified ear model in the future.
Subjects
binaural technique
psychoacoustic
pinna effect
FEM
BEM
Type
thesis
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