Patent ID: 6741706
Filing Date: 2004-05-25
Classification: H04S

Abstract:
A method of processing a series of input audio signals representing a series of virtual audio sound sources placed at predetermined positions around a listener to produce a reduced set of audio output signals for playback over speaker devices placed around a listener, the method comprising the steps of:(a) for each of said input audio signals and for each of said audio output signals; (i) convolving said input audio signals with an initial head portion of a corresponding impulse response mapping substantially the initial sound and early reflections for an impulse response of a corresponding virtual audio source to a corresponding speaker device so as to form a series of initial responses; (b) for each of said input audio signals and for each of said audio output signals: (i) forming a combined mix from said audio input signals; and (ii) determining a single convolution tail; (iii) convolving said combined mix with said single convolution tail to form a combined tail response; (c) for each of said audio output signals; (i) combining a corresponding series of initial responses and a corresponding combined tail response to form said audio output signal.