Patent ID: 8774418

Claim:
A multi-channel down-mixing device, comprising a head-related transfer functions (HRTF) module, said HRTF module providing HRTF to transform a single audio signal into signals heard by two human ears to obtain sound source locations of virtual loudspeakers in a space; a common-acoustic-pole and zero (CAPZ) model, said CAPZ model being connected with said HRTF module, said CAPZ model transforming said HRTF into a model having common-poles and zeros, said model having a plurality of corresponding zero coefficients for each angle and a set of common-pole coefficients for all angles; an artificial reverberator, said artificial reverberator obtaining a plurality of reflection echoes of audio waves in said space with user-provided information of said space to obtain a set of reverberation coefficients; a down-mixing module, said down-mixing module being connected with said CAPZ model and said artificial reverberator, said down-mixing module obtaining said plurality of zero coefficients and said set of common-pole coefficients to down-mix 5.1-channel audio signals into 4-channel audio signals with coordination of said reverberation coefficients; a channel distributor, said channel distributor being connected with said down-mixing module, said channel distributor being at least one sound card having more than 2-channels to output said 4-channel audio signals obtained from said down-mixing module; and a 4-channel player, said 4-channel player being connected with said channel distributor, said 4-channel player outputting sounds obtained by converting said 4-channel audio signals.