US 12,348,949 B2
Active cancellation of a height-channel soundbar array's forward sound radiation
Brad Starobin, Baltimore, MD (US); Scott Orth, Laurel, MD (US); and Stuart W. Lumsden, Baltimore, MD (US)
Assigned to Polk Audio, LLC, Owings Mills, MD (US)
Filed by Polk Audio, LLC, Owings Mills, MD (US)
Filed on Mar. 6, 2024, as Appl. No. 18/596,917.
Application 18/596,917 is a continuation of application No. 17/436,932, granted, now 11,937,066, previously published as PCT/US2020/021745, filed on Mar. 9, 2020.
Claims priority of provisional application 62/815,204, filed on Mar. 7, 2019.
Prior Publication US 2024/0214758 A1, Jun. 27, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H04S 7/00 (2006.01); H04R 3/12 (2006.01); H04R 5/02 (2006.01); H04R 5/04 (2006.01); H04S 3/00 (2006.01)
CPC H04S 7/301 (2013.01) [H04R 3/12 (2013.01); H04R 5/02 (2013.01); H04R 5/04 (2013.01); H04S 3/008 (2013.01); H04S 7/302 (2013.01); H04R 2201/028 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A multi-channel single enclosure height-channel enabled soundbar loudspeaker system, comprising:
an enclosure having a front surface, a top wall surface, a left sidewall, and a right sidewall;
a left height-channel direct signal cancellation loudspeaker driver;
a right height-channel direct signal cancellation loudspeaker driver;
at least one left height-channel speaker driver aimed upwardly from the top wall surface, positioned proximate to the left sidewall, and having a first acoustic center spaced from the left height-channel direct signal cancellation loudspeaker driver by a distance DL-AC in a range of 2 to 8 inches;
at least one right height-channel speaker driver aimed upwardly from the top wall surface, positioned proximate to the right sidewall, and having a second acoustic center spaced from the right height-channel direct signal cancellation loudspeaker driver by a distance DR-AC in a range of 2 to 8 inches;
left and right height-channel signal inputs, signal processing, and first and second amplifiers connected to the left height-channel direct signal cancellation loudspeaker driver and the right height-channel direct signal cancellation loudspeaker driver, respectively;
wherein the signal processing comprises a band pass filter for generating filtered left and right height-channel signals, and a phase inversion configured to invert the phase of the filtered left and right height-channel signals for generating filtered, inverted left and right height-channel signals, and
wherein the signal processing further comprises attenuation configured to provide about 3-9 dB of attenuation to generate level adjusted filtered, inverted left and right direct height-channel cancellation signals.