ABEL GLADSTONE MANGAM , pp. 54. ING/School of Engineering, 2012.
Binaural technology is used to recreate realistic sound to the listener. How-
ever, many signal processing and noise cancellation techniques do not pre-
serve the binaural characteristics of the binaural sound and thus destroying
the realism. Binaural technologies are used in various applications like hear-
ing aids, auditory displays, echo location for the blind, etc. The heart of
binaural technology is the Head Related Transfer Functions which provide
the transfer functions of the human pinnae, the shoulders etc. These Head
Related Transfer Functions provide the Inter aural Level Dierences that
contributes to the binaural sound. Apart from the Head Related Transfer
Functions there are many other cues like the Inter Aural Time dierences
in binaural hearing that provides information about the nature and location
of the source. The Inter Aural Time dierences are known to contribute
to the localization at low frequencies and the Inter aural Level Dierences
contribute to localization at high frequencies. This thesis provides a design
solution for reproducing the sound eld (preserving the binaural cues) with
the help of microphone arrays placed on either side of the listener's ears.
The primary work in this thesis is to build a model of a binaural hearing
system and implement it in real time using the Matlab Audio Processing
framework. This provides a binaural platform for further enhancements
like noise reduction and speech enhancement, etc. The system is evaluated
mathematically and perceptually. The results show that the platform tracks
a single user very accurately and perceptual tests show that the system can
be used to localize sounds in the azimuthal plane.