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New Measurement Techniques for Portable Listening Devices: Technical Report - October 2013
The Design of Distributed Sound Systems from Uniformity of Coverage and Other Sound-Field Considerations
The sound distribution on a plane normal to the axis of a single loudspeaker can be approximated by a simple equation with known constants. The sound distribution on the listening plane of distributed systems can then be found. Maximum and minimum direct sound pressure levels, relative to the axial values of a single loudspeaker, and their differences can also be expressed as simple equations with known constants along with the density in the number of loudspeakers per -6-dB coverage circle area. A method is given for designing distributed sound systems to satisfy a given maximum or minimum sound pressure level relative to the axial level of a single loudspeaker or a given uniformity of coverage. A previous restriction of only six available combinations of loudspeaker patterns and degrees of overlap is removed by replacing such combinations by loudspeaker density, even though it is not necessary to know the density to use the method, and there need be no direct reference to it or the degree of overlap. Two transparent overlays are used with appropriately scaled room drawings giving a short design time and design flexibility. Values of all constants needed for the simple calculations and the planar -6-dB coverage angles and radii are tabulated for a selection of loudspeakers. Worked examples are included.
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