Loudspeaker array system
AssigneeHarman International Industries, Incorporated
InventorUlrich Horbach
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Abstract
The invention is a multi-channel loudspeaker system that provides a compact loudspeaker configuration and filter design methodology that operates in the digital signal processing domain. Further, the loudspeaker system can be designed as a multi-way loudspeaker system comprised of a symmetric arrangement of loudspeaker drivers in a two-dimensional plane and can achieve high-quality sound, constant directivity over a large area in both the vertical and horizontal planes and can be used in connection with stereo loudspeaker systems, multi-channel home entertainment systems and public address systems.
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A method for varying the directivity of a two-dimensional loudspeaker array comprising:
- determining optimal locations for a linear plurality of transducers along a main axis, the plurality of transducers positioned in pairs symmetrically about a center point of the main axis at locations optimized according to transducer size, number of transducers, and a directivity target function;
- replacing one of a selected symmetrical pair of the linear plurality of transducers with a first pair of replacement transducers substantially identical to the selected symmetrical pair of transducers;
- replacing the other one of the selected symmetrical pair with a second pair of replacement transducers substantially identical to the selected symmetrical pair of transducers;
- positioning the first replacement transducer pair symmetrically about the location of one of the replaced pair of transducers on the main axis, the first replacement transducer pair located along a line parallel to a second axis perpendicular to the main axis;
- and
- positioning the second replacement transducer pair symmetrically about the location of the other one of the replaced transducer on the main axis, the second replacement transducer pair located along a line parallel to the second axis;
- where the second replacement transducer pair is positioned to be symmetrical to the first replacement transducer pair about the second axis.
A method for configuring a two-dimensional loudspeaker array comprising:
- determining optimal locations for a linear plurality of transducers along a main axis, the plurality of transducers positioned in pairs symmetrically about a center point of the main axis at locations optimized according to transducer size, number of transducers, and a directivity function;
- replacing one of a selected symmetrical pair of the linear plurality of transducers with a first pair of replacement transducers substantially identical to the selected symmetrical pair of transducers;
- replacing the other one of the selected symmetrical pair with a second pair of replacement transducers substantially identical to the selected symmetrical pair of transducers;
- positioning the first replacement transducer pair symmetrically about the location of one of the replaced pair of transducers on the main axis, the first replacement transducer pair located along a line parallel to a second axis perpendicular to the main axis;
- positioning the second replacement transducer pair symmetrically about the location of the other one of the replaced transducer on the main axis, the second replacement transducer pair located along a line parallel to the second axis, where the second replacement transducer pair is positioned to be symmetrical to the first replacement transducer pair about the second axis;
- and
- determining linear phase shift coefficients for at least one digital FIR filter for processing a digital audio signal from an audio sound source.
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