US 12,170,885 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., Goleta, CA (US)
Filed by Sonos, Inc., Santa Barbara, CA (US)
Filed on Jun. 9, 2023, as Appl. No. 18/332,387.
Application 18/332,387 is a continuation of application No. 17/135,358, filed on Dec. 29, 2020.
Application 17/135,358 is a continuation of application No. 16/582,942, filed on Sep. 25, 2019, granted, now 10,880,671, issued on Dec. 29, 2020.
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 2023/0328475 A1, Oct. 12, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G10L 25/21 (2013.01); G10L 21/0272 (2013.01); H04R 5/02 (2006.01); H04R 5/04 (2006.01); H04S 3/00 (2006.01); H04S 7/00 (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)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
one or more processors;
tangible, non-transitory computer-readable media comprising program instructions executable by the one or more processors such that the system is configured to:
receive a multi-channel audio signal comprising a first channel and a second channel;
for the first channel, (i) apply a low pass filter to the first channel to obtain a low-frequency component of the first channel, wherein the low-frequency component of the first channel comprises audio information below a threshold frequency, and (ii) determine an energy of the low-frequency component of the first channel;
for the second channel, (i) apply the low pass filter to the second channel to obtain a low-frequency component of the second channel, wherein the low-frequency component of the second channel comprises audio information below the threshold frequency, and (ii) determine an energy of the low-frequency component of the second channel;
sum the energies of the determined low-frequency components to obtain a sum of energies of the low-frequency components;
combine the determined low-frequency components of each channel into a consolidated low-frequency signal;
determine an electrical energy of the consolidated low-frequency signal;
generate a gain-adjusted low-frequency signal based on (i) the sum of the energies of the low-frequency components and (ii) the electrical energy of the consolidated low-frequency signal;
generate a gain-adjusted multi-channel audio signal comprising the gain-adjusted low-frequency signal; and
cause playback of the gain-adjusted multi-channel audio signal via a plurality of audio drivers.