Patent ID: 6072877
Filing Date: 2000-06-06
Classification: H04S

Abstract:
A three-dimensional virtual audio display method comprising:generating a set of transfer function parameters in response to a spatial location or direction signal, andfiltering an audio signal in response to said set of transfer function parameters, wherein said set of transfer function parameters are selected from or interpolated among parameters derived by smoothing the amplitude of the frequency components of a known transfer function over a bandwidth which is a non-constant function of frequency wherein said smoothing includes applying a frequency warping function to said known transfer function wherein said frequency warping function maps frequency to a nonlinear scale to implement the equivalent of critical band smoothing, applying a non-linear amplitude scaling to said frequency-warped transfer function, transforming the frequency-warped transfer function to the time domain, time-domain windowing the impulse response of the frequency-warped transfer function, and noting the parameters of the resulting compressed transfer function.