System for cardioid sound field generation from dissimilar...

Details System for cardioid sound field generation from dissimilar... System for cardioid sound field generation from dissimilar...

2006-07-24

2010-10-12

Le, Huyen D (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Plural or compound reproducers

C381S186000, C381S386000

Reexamination Certificate

active

07813516

ABSTRACT:
Front to back linear arrays of loudspeakers provide a sound field compressed both vertical and horizontally with the horizontal directivity patter exhibiting a cardioid shape. The problem addressed is improving the horizontal directivity of linear arrays. A linear array of bass units is placed behind a linear array of mid to high frequency range devices to improve horizontal directivity. The first and second linear arrays are placed back to front, oriented to radiate in a forward direction and spaced by a known distance “d”. The distance “d” may be selected to determine the degree of narrowing of the cardioid pattern sound field generated. Greater directivity is also achieved by adding additional linear arrays of bass units behind the second array. The upper frequency knee of the bass unit arrays must overlap the lower frequency knee of the mid/high-frequency unit array.

REFERENCES:
patent: 6016353 (2000-01-01), Gunness
patent: 2007/0110269 (2007-05-01), Levitsky

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