METHOD FOR PRACTICAL IMPLEMENTATION OF SOUND FIELD REPRODUCTION BASED ON SURFACE INTEGRALS IN THREE DIMENSIONS

摘要

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 loudspeakers are located with the sound field radiating from a virtual source, includes the 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 to filter the first audio input signal to form second audio input signals. Loudspeakers are positioned for a sampling of the loudspeaker surface into second loudspeaker surfaces for which the loudspeaker spacing is smaller for loudspeakers located in the horizontal plane than for elevated loudspeakers. Loudspeaker weighting data are defined from the ratio between the area covered by second loudspeaker surfaces and the total area of the loudspeaker surface. The second audio input signals are modified according to the loudspeaker weighting data to form third audio input signals, which are fed into the loudspeakers to synthesize a sound field.

主权项

1. A method for 3D sound field reproduction from a first audio input signal using a plurality of loudspeakers distributed over a loud-speaker 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 loud-speakers, 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 second loudspeaker surfaces and a total area of the loudspeaker surface; modifying the second audio input signals according to the loudspeaker weighting data for forming third audio input signals; and, alimenting loudspeakers with the third audio input signals for synthesizing a sound field.