US 10,893,361 B2
Low frequency sound field in a listening environment
Peter John Chapman, Lemvig (DK); and Martin Olsen, Struer (DK)
Assigned to HARMAN BECKER AUTOMOTIVE SYSTEMS GMBH, Karlsbad (DE)
Filed by Harman Becker Automotive Systems GmbH, Karlsbad (DE)
Filed on Jan. 3, 2019, as Appl. No. 16/239,143.
Claims priority of provisional application 62/613,731, filed on Jan. 4, 2018.
Prior Publication US 2019/0208322 A1, Jul. 4, 2019
Int. Cl. H04R 3/04 (2006.01); H04R 1/26 (2006.01); H04R 3/12 (2006.01); H04R 3/14 (2006.01); H04R 1/02 (2006.01); H04S 7/00 (2006.01); H04R 7/00 (2006.01)
CPC H04R 3/04 (2013.01) [H04R 1/025 (2013.01); H04R 1/26 (2013.01); H04R 3/12 (2013.01); H04R 3/14 (2013.01); H04S 7/301 (2013.01); H04S 7/307 (2013.01); H04R 2499/13 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An audio system, comprising:
a plurality of low frequency loudspeakers configured to output low frequency sound into a listening environment; and
a plurality of filters, each of the plurality of low frequency loudspeakers having a respective filter of the plurality of filters assigned thereto to yield a homogeneous low frequency sound field, the homogeneous low frequency sound field comprising homogenizing a low frequency listening experience for users in a plurality of locations in the listening environment, wherein the listening environment comprises a number of seats, the plurality of low frequency loudspeakers includes a quantity of low frequency loudspeakers that is based on the number of seats, and each of the low frequency loudspeakers is mounted in a sealed enclosure such that rear sound radiation from a back side of the low frequency loudspeaker is isolated from users in the plurality of locations in the listening environment and so as to reduce leakage of low frequency audio to outside of the listening environment.