US 11,700,501 B2
Systems and methods of adjusting bass levels of multi-channel audio signals
Hilmar Lehnert, Framingham, MA (US); Aurelio Ramos, Jamaica Plain, MA (US); and Bob Dizon, Cambridge, MA (US)
Assigned to Sonos, Inc., Santa Barbara, CA (US)
Filed by Sonos, Inc., Santa Barbara, CA (US)
Filed on Dec. 28, 2020, as Appl. No. 17/135,358.
Application 17/135,358 is a continuation of application No. 16/582,942, filed on Sep. 25, 2019, granted, now 10,880,671.
Application 16/582,942 is a continuation of application No. 15/927,981, filed on Mar. 21, 2018, granted, now 10,462,599, issued on Oct. 29, 2019.
Prior Publication US 2021/0120362 A1, Apr. 22, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04S 7/00 (2006.01); H04R 5/02 (2006.01); H04R 5/04 (2006.01); G10L 25/21 (2013.01); G10L 21/0272 (2013.01); H04S 3/00 (2006.01)
CPC H04S 7/307 (2013.01) [G10L 21/0272 (2013.01); G10L 25/21 (2013.01); H04R 5/02 (2013.01); H04R 5/04 (2013.01); H04S 3/006 (2013.01); H04S 3/002 (2013.01); H04S 2400/01 (2013.01); H04S 2400/07 (2013.01); H04S 2400/13 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A playback device comprising:
a plurality of audio drivers;
one or more processors;
tangible, non-transitory, computer-readable media storing instructions executable by the one or more processors, wherein the instructions, when executed, cause the playback device to perform operations comprising:
receiving a multi-channel audio signal comprising a set of audio channels;
for each channel in the set of audio channels, applying a low pass filter to the channel to obtain a low-frequency component of the channel comprising audio information below a threshold frequency;
combining the low-frequency component of each channel into a consolidated low frequency signal;
adjusting a gain of the consolidated low frequency signal to generate a gain-adjusted consolidated low frequency signal;
for each channel in the set of audio channels, mixing the gain-adjusted consolidated low frequency signal with audio content of the channel above the threshold frequency to generate a gain-adjusted channel;
playing the individual gain-adjusted channels via the plurality of audio drivers;
wherein the set of channels in the multi-channel audio signal comprises a left-channel audio signal, a center-channel audio signal, and a right-channel audio signal, and wherein for each channel in the set of audio channels, applying a low pass filter to the channel to obtain a low-frequency component of the channel comprising audio information below a threshold frequency comprises:
low pass filtering the left-channel audio signal to obtain a low-frequency component of the left-channel audio signal comprising audio information below the threshold frequency;
low pass filtering the right-channel audio signal to obtain a low-frequency component of the right-channel audio signal comprising audio information below the threshold frequency; and
low pass filtering the center-channel audio signal to obtain a low-frequency component of the center-channel audio signal comprising audio information below the threshold frequency.