Local Ambisonics signal mixing method for four frontal loudspeakers in multichannel spatial sound
Typical loudspeaker configurations in multichannel spatial sound usually involve loudspeakers in left-front and right-front directions in the horizontal plane as well as in left-front-high and right-front-high directions in a high elevation.Using these four loudspeakers,the present work proposes a method of the first-order local Ambisonics signal mixing to recreate horizontal-and vertical-frontal virtual source in spatial sound reproduction.The signal mixing is derived by decomposing the target and reproducing sound filed with spherical harmonic functions and matching them up to the first order.By using a simplified head model and an exact head related transfer function(HRTF)model,it is demonstrated that the signal mixing method can create appropriate directional localization cues at low frequency,including interaural time difference and its dynamic variation with head turning.A virtual source localization experiment indicates that the signal mixing can recreate virtual source in various azimuths and elevations within or even a little bit beyond the range of loudspeaker arrangement.Therefore,the method in present work is applicable to recreate virtual source matching with picture in video-audio reproduction.
NETL
NSTL
万方数据
维普
