| 摘要 |
This invention provides a sound source system capable of producing a desired coverage pattern with high SPL that may be steered towards a desired listening area. The sound source system may provide an array of sound sources where the coverage pattern and SPL may depend on the height, width, and depth of the assembled array. Adding height and width to the array may narrow the vertical and horizontal coverage patterns that are projected, respectively. To maintain a substantially constant coverage pattern, a frequency shading techniques may be used to keep the height of the array constant relative to the wavelength. Adding depth to the array may provide greater SPL with minimal effect on the coverage pattern because array's height and width have not changed. The sound source system may also coherently sum in the main lobe and provide substantial off-axis rejection. This may be done using an end-fired related principle where each sound source in the array may be delayed proportional to its delay distance. The delay distance for each sound source may be the shortest distance between the sound source and the reference plane. This allows the sound source system to provide a desired coverage pattern with a desired SPL.
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