Patent ID: 9338572
Filing Date: 2016-05-10
CPC Classification: H04S

Claim Text:
1. A method for 3D sound field reproduction from a first audio input signal using a plurality of loudspeakers distributed over a loudspeaker surface aiming at synthesizing a 3D sound field within a listening area in which none of the plurality of loudspeakers are located, said sound field being radiated from a virtual source, said method comprising steps of: calculating positioning filters using virtual source description data and loudspeaker description data according to a sound field reproduction technique derived from a surface integral; applying positioning filter coefficients for filtering the first audio input signal for forming second audio input signals; positioning loudspeakers for realizing a sampling and fractioning of the entire loudspeaker surface into second, fractioned and smaller loudspeaker surfaces assigned to each single loudspeaker of the plurality of loudspeakers, and for which fractioned loudspeaker surfaces the loudspeaker spacing is smaller for loudspeakers located in a horizontal plane than for elevated loudspeakers so loudspeaker density in said horizontal plane is the highest and decreases with distances of loudspeakers located away, and thus elevated from, said horizontal plane; defining loudspeaker weighting data from a ratio between an area covered by the second loudspeaker surfaces and a total area of the loudspeaker surface; modifying the second audio input signals according to the loudspeaker weighting for forming third audio input signals; and, alimenting loudspeakers with the third audio input signals for synthesizing a sound field.