Echo Cancellation By Deforming Sound Waves
Through Inverse Convolution
Author(s)
R. Aylward
Abstract
This study concerns the mathematical modelling of speech related acoustical hearing
discomforts in medium to large environments (e.g. auditoriums and concert halls).
Discomforts arise from both phase distortion (echo) and perceived frequency transformations
(Comb filters) Borwickfl], Ando[3]. These distortions are caused by the physical constraints
imposed on sound transmission within large environments. Deconvolution was applied to the
measured signals to recover the original sound from the environmentally distorted sound, thus
separating it from the transformation system function (Room impulse response). Several
samples were used for different positions within the hall. The different methods investigated
for the deconvolution process were cross-correlation, cepstmm and adaptive filter techniques,
Oppcnlicim[2]. Upon se
Keywords
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