Signal processing method, apparatus and electronic device

1 . A signal processing method, comprising:

obtaining an audio signal;

in response to a first control signal, performing a first processing on the audio signal to obtain a first audio signal, the first processing being used to adjust a volume gain of the audio signal, the first control signal being a volume control signal;

based on the first control signal, performing a second processing on the first audio signal to obtain a second audio signal, the second processing being used to adjust a frequency gain of the first audio signal, wherein the performing the second processing on the first audio signal based on the first control signal to obtain the second audio signal includes performing a low-frequency extension processing on the first audio signal based on the first control signal to expand a frequency bandwidth at a current system volume level, and the low-frequency extension processing at the current system volume level is performed prior to an audio post-processing; and

performing the audio post-processing on the second audio signal,

wherein the performing the low-frequency extension processing on the first audio signal based on the first control signal to expand the frequency bandwidth at the current system volume level includes:

based on the first control signal, determining the current system volume level;

based on a first strategy, determining an extension amount of the first audio signal at the current system volume level; and

based on the extension amount, performing the low-frequency extension processing on the first audio signal to expand the frequency bandwidth at the current system volume level.

2 . The signal processing method according to claim 1 , wherein the first strategy includes:

different system volume levels corresponding to different extension amounts adjusted in the low-frequency extension processing; and/or audio signals with different frequency bands corresponding to different loudness levels adjusted in the low-frequency extension processing.

3 . The signal processing method according to claim 1 , wherein performing the low-frequency extension processing on the first audio signal based on the extension amount includes:

using a dynamic equalizer to perform the low-frequency extension processing on the first audio signal.

4 . The signal processing method according to claim 1 , wherein:

after performing the second processing on the first audio signal based on the first control signal to obtain the second audio signal, the method further includes performing a third processing on the second audio signal to obtain a third audio signal, the third processing being used to adjust a sound pressure level of the second audio signal; and

performing the audio post-processing on the second audio signal includes performing the audio post-processing on the third audio signal.

5 . The signal processing method according to claim 4 , wherein performing the third processing on the second audio signal to obtain the third audio signal includes:

adjusting a response sound pressure level of a low-frequency portion of the second audio signal based on an equal-loudness curve at the current system volume level.

6 . The signal processing method according to claim 1 , wherein:

obtaining the audio signal includes obtaining a buffered audio signal or a real-time system audio signal.

7 . The signal processing method according to claim 1 , wherein the audio post-processing is associated with a third-party audio post-processing algorithm.

8 . The signal processing method according to claim 7 , wherein the third-party audio post-processing algorithm comprises Dolby audio post-processing.

9 . A signal processing apparatus, comprising:

at least one memory storing program instructions; and

at least one processor coupled to the at least one memory,

wherein when being executed by the at least one processor, the program instructions cause the at least one processor to:

obtain an audio signal;

in response to a first control signal, perform a first processing on the audio signal to obtain a first audio signal, the first processing being used to adjust a volume gain of the audio signal, the first control signal being a volume control signal;

based on the first control signal, perform a second processing on the first audio signal to obtain a second audio signal, the second processing being used to adjust a frequency gain of the first audio signal, wherein the performing the second processing on the first audio signal based on the first control signal to obtain the second audio signal includes performing a low-frequency extension processing on the first audio signal based on the first control signal to expand a frequency bandwidth at a current system volume level, and the low-frequency extension processing at the current system volume level is performed prior to an audio post-processing; and

perform the audio post-processing on the second audio signal,

wherein when performing the low-frequency extension processing on the first audio signal based on the first control signal to expand the frequency bandwidth at the current system volume level, the at least one processor is further configured to:

based on the first control signal, determine the current system volume level;

based on a first strategy, determine an extension amount of the first audio signal at the current system volume level; and

based on the extension amount, perform the low-frequency extension processing on the first audio signal to expand the frequency bandwidth at the current system volume level.

10 . The signal processing apparatus according to claim 9 , wherein the first strategy includes:

different system volume levels corresponding to different extension amounts adjusted in the low-frequency extension processing; and/or audio signals with different frequency bands corresponding to different loudness levels adjusted in the low-frequency extension processing.

11 . The signal processing apparatus according to claim 9 , wherein when performing the low-frequency extension processing on the first audio signal based on the extension amount, the at least one processor is further configured to:

use a dynamic equalizer to perform the low-frequency extension processing on the first audio signal.

12 . The signal processing apparatus according to claim 9 , wherein:

after performing the second processing on the first audio signal based on the first control signal to obtain the second audio signal, the at least one processor is further configured to perform a third processing on the second audio signal to obtain a third audio signal, the third processing being used to adjust a sound pressure level of the second audio signal; and

performing the audio post-processing on the second audio signal includes performing the audio post-processing on the third audio signal.

13 . The signal processing apparatus according to claim 12 , wherein when performing the third processing on the second audio signal to obtain the third audio signal, the at least one processor is further configured to:

adjust a response sound pressure level of a low-frequency portion of the second audio signal based on an equal-loudness curve at the current system volume level.

14 . The signal processing apparatus according to claim 9 , wherein:

obtaining the audio signal includes obtaining a buffered audio signal or a real-time system audio signal.

15 . An electronic device, comprising a signal processing apparatus, wherein the signal processing apparatus includes:

at least one memory storing program instructions; and

at least one processor coupled to the at least one memory,

wherein when being executed by the at least one processor, the program instructions cause the at least one processor to:

obtain an audio signal;

in response to a first control signal, perform a first processing on the audio signal to obtain a first audio signal, the first processing being used to adjust a volume gain of the audio signal, the first control signal being a volume control signal;

based on the first control signal, perform a second processing on the first audio signal to obtain a second audio signal, the second processing being used to adjust a frequency gain of the first audio signal, wherein the performing the second processing on the first audio signal based on the first control signal to obtain the second audio signal includes performing a low-frequency extension processing on the first audio signal based on the first control signal to expand a frequency bandwidth at a current system volume level, and the low-frequency extension processing at the current system volume level is performed prior to an audio post-processing; and

perform the audio post-processing on the second audio signal,

wherein when performing the low-frequency extension processing on the first audio signal based on the first control signal to expand the frequency bandwidth at the current system volume level, the at least one processor is further configured to:

based on the first control signal, determine the current system volume level;

based on a first strategy, determine an extension amount of the first audio signal at the current system volume level; and

based on the extension amount, perform the low-frequency extension processing on the first audio signal to expand the frequency bandwidth at the current system volume level.

16 . The electronic device according to claim 15 , wherein the first strategy includes:

different system volume levels corresponding to different extension amounts adjusted in the low-frequency extension processing; and/or audio signals with different frequency bands corresponding to different loudness levels adjusted in the low-frequency extension processing.