Systems and Methods of Adjusting Bass Levels of Multi-Channel Audio Signals
Systems and methods for adjusting bass levels of a multi-channel audio signal include, among other features, (i) receiving the multi-channel signal via a playback device; (ii) separating, from the multi-channel signal, low-frequency signals comprising frequencies less than a threshold frequency; (iii) determining electrical energies of the low-frequency signals; (iv) determining a first energy by summing the electrical energies of the low-frequency signals; (v) consolidating the low-frequency signals into a consolidated low-frequency signal; (vi) determining a second energy by determining an electrical energy of the consolidated low-frequency signal; (vii) generating a gain-adjusted low-frequency signal by adjusting a gain of the consolidated low-frequency signal based on both (a) the first energy and (b) the second energy; (viii) generating a gain-adjusted multi-channel signal by mixing the gain-adjusted low-frequency signal back into the multi-channel signal; and (ix) using the gain-adjusted multi-channel signal to play back gain-adjusted multi-channel audio content via the playback device.
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 one or more multi-channel audio signals that each comprise a first channel and a second channel;
for each multi-channel audio signal of the one or more multi-channel audio signals that has a volume that is above a threshold volume:
obtain a low-frequency component of the first channel of the respective multi-channel audio signal, wherein the low-frequency component of the first channel of the respective multi-channel audio signal comprises audio information below a threshold frequency;
obtain a low-frequency component of the second channel of the respective multi-channel audio signal, wherein the low-frequency component of the second channel of the respective multi-channel audio signal comprises audio information below the threshold frequency;
generate a gain-adjusted low-frequency signal based at least on (i) a first determined energy associated with the low-frequency components of the respective multi-channel audio signal, and (ii) a second determined energy associated with the low-frequency components of the respective multi-channel audio 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.
2 . The system of claim 1 , wherein the program instructions further comprise program instructions executable by the one or more processors such that the system is configured to:
for each other multi-channel audio signal of the one or more multi-channel audio signals that has a volume that is below the threshold volume, cause playback of the respective other multi-channel audio signal via the plurality of audio drivers.
3 . The system of claim 1 , wherein the first determined energy associated with the low-frequency components of the respective multi-channel audio signal comprises a sum of at least (i) an energy of the low-frequency component of the first channel of the respective multi-channel audio signal, and (ii) an energy of the low-frequency component of the second channel of the respective multi-channel audio signal.
4 . The system of claim 1 , wherein the second determined energy associated with the low-frequency components of the respective multi-channel audio signal comprises an electrical energy of a combination of the low-frequency components of each channel of the respective multi-channel audio signal.
5 . The system of claim 1 , wherein the threshold volume comprises a sound pressure level threshold, a sound power level threshold, or an amplitude threshold.
6 . The system of claim 1 , wherein the first channel comprises a left channel and the second channel comprises a right channel.
7 . The system of claim 1 , wherein the one or more multi-channel audio signals each further comprise a third channel, and wherein the program instructions further comprise program instructions executable by the one or more processors such that the system is configured to:
for each multi-channel audio signal of the one or more multi-channel audio signals that has the volume that is above the threshold volume:
obtain a low-frequency component of the third channel of the respective multi-channel audio signal.
8 . The system of claim 1 , wherein the one or more processors, the tangible, non-transitory computer-readable media, and the plurality of audio drivers are contained within a single playback device.
9 . Tangible, non-transitory computer-readable media comprising program instructions executable by one or more processors such that a system is configured to perform functions comprising:
receiving one or more multi-channel audio signals that each comprise a first channel and a second channel;
for each multi-channel audio signal of the one or more multi-channel audio signals that has a volume that is above a threshold volume:
obtaining a low-frequency component of the first channel of the respective multi-channel audio signal, wherein the low-frequency component of the first channel of the respective multi-channel audio signal comprises audio information below a threshold frequency;
obtaining a low-frequency component of the second channel of the respective multi-channel audio signal, wherein the low-frequency component of the second channel of the respective multi-channel audio signal comprises audio information below the threshold frequency;
generating a gain-adjusted low-frequency signal based at least on (i) a first determined energy associated with the low-frequency components of the respective multi-channel audio signal, and (ii) a second determined energy associated with the low-frequency components of the respective multi-channel audio signal;
generating a gain-adjusted multi-channel audio signal comprising the gain-adjusted low-frequency signal; and
causing playback of the gain-adjusted multi-channel audio signal via a plurality of audio drivers.
10 . The tangible, non-transitory computer-readable media of claim 9 , wherein the functions further comprise:
for each other multi-channel audio signal of the one or more multi-channel audio signals that has a volume that is below the threshold volume, causing playback of the respective other multi-channel audio signal via the plurality of audio drivers.
11 . The tangible, non-transitory computer-readable media of claim 9 , wherein the first determined energy associated with the low-frequency components of the respective multi-channel audio signal comprises a sum of (i) an energy of the low-frequency component of the first channel of the respective multi-channel audio signal, and (ii) an energy of the low-frequency component of the second channel of the respective multi-channel audio signal.
12 . The tangible, non-transitory computer-readable media of claim 9 , wherein the second determined energy associated with the low-frequency components of the respective multi-channel audio signal comprises an electrical energy of a combination of the low-frequency components of each channel of the respective multi-channel audio signal.
13 . The tangible, non-transitory computer-readable media of claim 9 , wherein the threshold volume comprises a sound pressure level threshold, a sound power level threshold, or an amplitude threshold.
14 . The tangible, non-transitory computer-readable media of claim 9 , wherein the first channel comprises a left channel and the second channel comprises a right channel.
15 . The tangible, non-transitory computer-readable media of claim 9 , wherein the one or more multi-channel audio signals each further comprise a third channel, and wherein the functions further comprise:
for each multi-channel audio signal of the one or more multi-channel audio signals that has the volume that is above the threshold volume:
obtaining a low-frequency component of the third channel of the respective multi-channel audio signal.
16 . A method comprising:
receiving one or more multi-channel audio signals that each comprise a first channel and a second channel;
for each multi-channel audio signal of the one or more multi-channel audio signals that has a volume that is above a threshold volume:
obtaining a low-frequency component of the first channel of the respective multi-channel audio signal, wherein the low-frequency component of the first channel of the respective multi-channel audio signal comprises audio information below a threshold frequency;
obtaining a low-frequency component of the second channel of the respective multi-channel audio signal, wherein the low-frequency component of the second channel of the respective multi-channel audio signal comprises audio information below the threshold frequency;
generating a gain-adjusted low-frequency signal based at least on (i) a first determined energy associated with the low-frequency components of the respective multi-channel audio signal, and (ii) a second determined energy associated with the low-frequency components of the respective multi-channel audio signal;
generating a gain-adjusted multi-channel audio signal comprising the gain-adjusted low-frequency signal; and
causing playback of the gain-adjusted multi-channel audio signal via a plurality of audio drivers.
17 . The method of claim 16 , further comprising:
for each other multi-channel audio signal of the one or more multi-channel audio signals that has a volume that is below the threshold volume, causing playback of the respective other multi-channel audio signal via the plurality of audio drivers.
18 . The method of claim 16 , wherein the first determined energy associated with the low-frequency components of the respective multi-channel audio signal comprises a sum of (i) an energy of the low-frequency component of the first channel of the respective multi-channel audio signal, and (ii) an energy of the low-frequency component of the second channel of the respective multi-channel audio signal.
19 . The method of claim 16 , wherein the second determined energy associated with the low-frequency components of the respective multi-channel audio signal comprises an electrical energy of a combination of the low-frequency components of each channel of the respective multi-channel audio signal.
20 . The method of claim 16 , wherein the threshold volume comprises a sound pressure level threshold, a sound power level threshold, or an amplitude threshold.