Thursday, August 23, 2007

Examples of sound beams

Here are some exemples of theoretical simulations of what a beam can look like for our 16-loudspeakers configuration. In the following figure, the loudspeakers are denoted by square markers. Three directivity plots (with a linear scale, which is different from logarithmic scale or the human hearing scale) are shown for three different beams directed at various angles. These directivity patterns are computed for 220Hz.

The following figures presents a beam in an horizontal plane. Note that the sound is train of 5 consecutive impulses so that these includes all the frequencies. X and Y axis are expressed in meters. The color scale represents the sound pressure (in Pascals). Clearly, the sound radiation is more intense in a given direction. This direction corresponds to the beam angle and depends on the time delays between the loudspeakers.

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