CN111445915A - Audio signal processing method and device, storage medium and terminal - Google Patents
Audio signal processing method and device, storage medium and terminal Download PDFInfo
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- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
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Abstract
A processing method and device, a storage medium and a terminal of audio signals are provided, the method comprises the following steps: receiving an audio signal to be processed; respectively carrying out low-pass filtering processing and high-pass filtering processing on the audio signal to obtain a low-pass filtering signal and a high-pass filtering signal; performing frequency shift processing on the low-pass filtering signal to obtain a low-frequency signal after frequency shift; obtaining an audio signal after sound mixing processing according to the low-pass filtering signal and the high-pass filtering signal after frequency shift; wherein the frequency of the low-pass filtered signal is lower than a first preset frequency; the frequency of the high-pass filtering signal is higher than or equal to the first preset frequency. The scheme of the invention can better enhance the fusion of the binaural beat and the music and improve the listening comfort and the binaural beat effect.
Description
Technical Field
The invention relates to the technical field of brain wave induction, in particular to a method and a device for processing an audio signal, a storage medium and a terminal.
Background
Brain wave induction (brain wave induction) music, as a form of music containing information on physiological states, provides a unique way for biofeedback and treatment, and is increasingly gaining attention. Specifically, brain wave induction, also called brain loading, intervenes in the mood of a person by shifting brain waves from one mode to another by an external stimulus. Common brain wave inducements include binaural beat frequency, monophonic beat frequency, isochronic, spectral inducements, and the like.
However, the current brain wave induced music mainly depends on electronic devices to realize the signal acquisition and music production processes, so the signal processing means is single, and the music effect is difficult to meet the requirements.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an audio signal processing method and device, a storage medium and a terminal, which can better enhance the fusion of binaural beats and music and improve the listening comfort and the binaural beat effect.
To solve the above technical problem, an embodiment of the present invention provides a method for processing an audio signal, including the following steps: receiving an audio signal to be processed; respectively carrying out low-pass filtering processing and high-pass filtering processing on the audio signal to obtain a low-pass filtering signal and a high-pass filtering signal; performing frequency shift processing on the low-pass filtering signal to obtain a low-frequency signal after frequency shift; obtaining an audio signal after sound mixing processing according to the low-pass filtering signal and the high-pass filtering signal after frequency shift; wherein the frequency of the low-pass filtered signal is lower than a first preset frequency; the frequency of the high-pass filtering signal is higher than or equal to the first preset frequency.
Optionally, the first preset frequency is 980 Hz.
Optionally, obtaining the audio signal after the audio mixing process according to the frequency-shifted low-pass filtered signal and the high-pass filtered signal includes: carrying out amplitude modulation processing on the high-pass filtering signal to obtain an amplitude-modulated high-frequency signal; and carrying out sound mixing processing on the amplitude-modulated high-frequency signal and the frequency-shifted low-frequency signal to obtain an audio signal after the sound mixing processing.
Optionally, performing amplitude modulation processing on the high-pass filtered signal includes: determining a binaural beat frequency difference; generating a binaural beat audio signal by adopting the binaural beat frequency difference; and determining the modulation amplitude of each moment of the binaural beat audio signal, and carrying out amplitude modulation processing on the high-pass filtering signal at the same moment by adopting the modulation amplitude of each moment.
Optionally, the binaural beat frequency difference includes a start binaural beat frequency difference and an end binaural beat frequency difference; generating a binaural beat audio signal using the binaural beat frequency difference comprises: according to the duration of the audio signal to be processed, performing time-frequency calculation to determine a binaural beat frequency difference at each moment, wherein the binaural beat frequency difference is uniformly changed from the starting binaural beat frequency difference to the ending binaural beat frequency difference in a one-way manner; and generating a binaural beat audio signal at the same time by using the binaural beat frequency difference at each time.
Optionally, the low-pass filtered signal includes a low-frequency left channel signal and a low-frequency right channel signal; the frequency shift processing of the low-pass filtered signal comprises: determining a binaural beat frequency difference at each time instant; shifting the low frequency left channel signal at each time by one half of the binaural beat frequency difference at the same time in the positive direction, and shifting the low frequency right channel signal by one half of the binaural beat frequency difference at the same time in the negative direction; or, for each time instant, the low-frequency right channel signal is shifted positively by one half of the binaural beat frequency difference at the same time instant, and for each time instant, the low-frequency left channel signal is shifted negatively by one half of the binaural beat frequency difference at the same time instant.
Optionally, the binaural beat frequency includes a start binaural beat frequency difference and an end binaural beat frequency difference; determining a binaural beat frequency difference for each time instant comprises: and performing time-frequency calculation according to the duration of the audio signal to be processed to determine a binaural beat frequency difference at each moment, wherein the binaural beat frequency difference is uniformly changed from the starting binaural beat frequency difference to the ending binaural beat frequency difference in a one-way manner.
To solve the above technical problem, an embodiment of the present invention provides an apparatus for processing an audio signal, including: the signal receiving module is suitable for receiving an audio signal to be processed; the filtering processing module is suitable for respectively carrying out low-pass filtering processing and high-pass filtering processing on the audio signal so as to obtain a low-pass filtering signal and a high-pass filtering signal; the frequency shift processing module is suitable for performing frequency shift processing on the low-pass filtering signal to obtain a frequency-shifted low-frequency signal; the audio mixing processing module is suitable for obtaining an audio signal after audio mixing processing according to the low-pass filtering signal and the high-pass filtering signal after frequency shifting; wherein the frequency of the low-pass filtered signal is lower than a first preset frequency; the frequency of the high-pass filtering signal is higher than or equal to the first preset frequency.
To solve the above technical problem, an embodiment of the present invention provides a storage medium having stored thereon computer instructions, which when executed perform the steps of the above audio signal processing method.
In order to solve the above technical problem, an embodiment of the present invention provides a terminal, including a memory and a processor, where the memory stores computer instructions capable of being executed on the processor, and the processor executes the steps of the processing method for the audio signal when executing the computer instructions.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the audio signal is filtered to be divided into the low-frequency part and the high-frequency part, the frequency shift processing is additionally added to the low-frequency part, and then the audio signal is mixed with the high-frequency part, so that the frequency difference of the obtained brain wave induced music is obtained by processing the low-frequency part which is more sensitive to human ears.
Further, in the embodiment of the present invention, the audio signal after the audio mixing process is obtained by performing audio mixing processing on the amplitude-modulated high-frequency signal and the frequency-shifted low-frequency signal, and the fusion of binaural beat and music can be further enhanced by a more complicated signal processing manner, so as to improve the listening comfort and the binaural beat effect.
Further, by generating a binaural beat audio signal, determining the modulation amplitude of the binaural beat audio signal at each moment, and performing amplitude modulation processing on the high-pass filtered signal at the same moment by adopting the modulation amplitude at each moment, a beat on loudness can be formed in a high-frequency part where binaural beats cannot take effect by a beat amplitude modulation mode, so as to make up for the problem that human ears lack sensitivity in the high-frequency part.
Further, through setting from the beginning binaural beat frequency difference to the binaural beat frequency difference that the ending binaural beat frequency difference is uniformly changed in a single direction, the binaural beat frequency difference at each moment can be determined through time-frequency calculation, so that the binaural beat frequency difference can be set more flexibly, the fusion of binaural beat and music can be further enhanced, and the listening comfort and the binaural beat effect can be improved.
Furthermore, by setting a proper binaural beat frequency difference and performing positive and negative frequency shift on the left and right channel signals of the low-frequency signal respectively, the frequency shift effect can be better adjusted, thereby further improving the listening comfort and the binaural beat effect.
Further, by setting the binaural beat frequency difference which changes uniformly in a one-way direction from the starting binaural beat frequency difference to the ending binaural beat frequency difference, the binaural beat frequency difference at each moment can be determined through time-frequency calculation, so that the binaural beat frequency difference can be set more flexibly, and the frequency shift effect can be further improved.
Drawings
Fig. 1 is a flow chart of a method for processing an audio signal according to an embodiment of the present invention;
FIG. 2 is a flowchart of one embodiment of step S13 of FIG. 1;
FIG. 3 is a flowchart of one embodiment of step S14 of FIG. 1;
FIG. 4 is a schematic structural diagram of an apparatus for processing an audio signal according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an operation scenario of another audio signal processing apparatus according to an embodiment of the present invention.
Detailed Description
In the prior art, brain wave induced music mainly depends on electronic devices to realize the processes of signal acquisition and music production, so that the signal processing means is single, and the music effect is difficult to meet the requirements.
For example, in a form of brain wave-induced music, binaural beats may be generated for input music so that the left and right channels hear stationary sounds of different amplitudes, respectively, so that the listener can hear music having a difference in amplitude by integration of the cranial nerves after the music enters the brain.
The inventor of the invention finds that the structure of the mainstream brain wave induction music at present mainly reduces the uncomfortable feeling of simply listening to the binaural beats through the music to a certain extent through simple superposition of the binaural beats and the common music, but the simple superposition of the music reduces the brain wave induction effect.
In the embodiment of the invention, an audio signal to be processed is received; respectively carrying out low-pass filtering processing and high-pass filtering processing on the audio signal to obtain a low-pass filtering signal and a high-pass filtering signal; performing frequency shift processing on the low-pass filtering signal to obtain a low-frequency signal after frequency shift; obtaining an audio signal after sound mixing processing according to the low-pass filtering signal and the high-pass filtering signal after frequency shift; wherein the frequency of the low-pass filtered signal is lower than a first preset frequency; the frequency of the high-pass filtering signal is higher than or equal to the first preset frequency, and by adopting the scheme, the audio signal is filtered to be divided into a low-frequency part and a high-frequency part, further frequency shift processing is additionally added to the low-frequency part, and then the audio signal is mixed with the high-frequency part, so that the frequency difference of the obtained brain wave induced music can be obtained by processing the low-frequency part which is more sensitive to human ears.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1, fig. 1 is a flowchart of a method for processing an audio signal according to an embodiment of the present invention. The audio signal processing method may include steps S11 to S14:
step S11: receiving an audio signal to be processed;
step S12: respectively carrying out low-pass filtering processing and high-pass filtering processing on the audio signal to obtain a low-pass filtering signal and a high-pass filtering signal;
step S13: performing frequency shift processing on the low-pass filtering signal to obtain a low-frequency signal after frequency shift;
step S14: obtaining an audio signal after sound mixing processing according to the low-pass filtering signal and the high-pass filtering signal after frequency shift;
wherein the frequency of the low-pass filtered signal is lower than a first preset frequency; the frequency of the high-pass filtering signal is higher than or equal to the first preset frequency.
In a specific implementation of step S11, the audio signal to be processed may be an audio signal for forming brain wave inducing music, such as general music.
In a specific implementation of step S12, the audio signal may be processed by low-pass filtering and high-pass filtering respectively using conventional low-pass filter and high-pass filter.
The low-pass filtered signal may be a filtered signal with a frequency lower than a first preset frequency, and the high-pass filtered signal may be a filtered signal with a frequency higher than or equal to the first preset frequency.
It will be appreciated that the first predetermined frequency may be determined according to the sensitivity of the human ear, for example selected from: 900Hz to 1100 Hz.
In a specific implementation manner of the embodiment of the present invention, the first preset frequency may be set to 980Hz, so as to improve the rationality of the division of the low-pass filtering and the high-pass filtering.
In the embodiment of the invention, the frequency band parts lower than 980Hz and higher than 980Hz in the music are respectively obtained through the low-pass filter and the high-pass filter, and the high-frequency part and the low-frequency part of the audio signal can be respectively processed, so that the fusion of the subsequently obtained binaural beat and the music can be better enhanced, and the listening comfort and the binaural beat effect can be improved.
In a specific implementation of step S13, the low-pass filtered signal may be frequency-shifted by using a conventional frequency shifter to obtain a frequency-shifted low-frequency signal.
Referring to fig. 2, fig. 2 is a flowchart of an embodiment of step S13 in fig. 1, and the step of performing frequency shift processing on the low-pass filtered signal may include step S21 to step S22, and may further include step S21 to step S23, which are described below.
In step S21, the binaural beat frequency difference at each time instant is determined.
Wherein the binaural beat frequency difference may be predetermined, e.g. externally input.
In a specific implementation manner of the embodiment of the present invention, the binaural beat frequency difference is a fixed and unchangeable value, so that the binaural beat frequency difference is consistent for each time of the audio signal to be processed.
In another specific implementation manner of the embodiment of the present invention, the binaural beat frequency difference may be variable, for example, a start binaural beat frequency difference and an end binaural beat frequency difference may be input, and the binaural beat frequency difference at each time may be determined by calculation.
Specifically, the step of determining the binaural beat frequency difference at each time instant may comprise: and performing time-frequency calculation according to the duration of the audio signal to be processed to determine a binaural beat frequency difference at each moment, wherein the binaural beat frequency difference is uniformly changed from the starting binaural beat frequency difference to the ending binaural beat frequency difference in a one-way manner.
In the embodiment of the invention, by setting the binaural beat frequency difference which is uniformly changed in a one-way manner from the starting binaural beat frequency difference to the ending binaural beat frequency difference, the binaural beat frequency difference at each moment can be determined through time-frequency calculation, so that the binaural beat frequency difference can be more flexibly set, the fusion of binaural beat and music can be further enhanced, and the listening comfort and the binaural beat effect can be improved.
In step S22, the low frequency left channel signal at each time instant is shifted positively by one half of the binaural beat frequency difference at the same time instant and the low frequency right channel signal is shifted negatively by one half of the binaural beat frequency difference at the same time instant.
Wherein the low pass filtered signal may comprise a low frequency left channel signal and a low frequency right channel signal.
In the embodiment of the invention, by setting a proper binaural beat frequency difference and respectively carrying out positive and negative frequency shifting on the left and right sound track signals of the low-frequency signal, the frequency shifting effect can be better adjusted, thereby further improving the listening comfort and the binaural beat effect.
In step S23, the low frequency right channel signal at each time instant is shifted positively by one half of the binaural beat frequency difference at the same time instant and the low frequency left channel signal is shifted negatively by one half of the binaural beat frequency difference at the same time instant.
In the embodiment of the invention, when the positive frequency shift and the negative frequency shift are respectively carried out on the left channel signal and the right channel signal of the low-frequency signal, the positive frequency shift or the negative frequency shift can be selected and used according to specific conditions, so that a proper mode can be flexibly selected to better adjust the frequency shift effect, and the listening comfort and the binaural beat effect are further improved.
With continued reference to fig. 1, in a specific implementation of step S14, a conventional mixer may be used to mix the frequency-shifted low-pass filtered signal and the high-pass filtered signal.
Referring to fig. 3, fig. 3 is a flowchart of an embodiment of step S14 in fig. 1, and the step of obtaining the audio signal after mixing processing according to the frequency-shifted low-pass filtered signal and the high-pass filtered signal may include steps S31 to S32, which are described below.
In step S31, amplitude modulation processing is performed on the high-pass filtered signal to obtain an amplitude-modulated high-frequency signal.
Further, the step of amplitude modulating the high pass filtered signal may comprise: determining a binaural beat frequency difference; generating a binaural beat audio signal by adopting the binaural beat frequency difference; and determining the modulation amplitude of each moment of the binaural beat audio signal, and carrying out amplitude modulation processing on the high-pass filtering signal at the same moment by adopting the modulation amplitude of each moment.
In the embodiment of the invention, by generating the binaural beat audio signal, determining the modulation amplitude of the binaural beat audio signal at each moment, and performing amplitude modulation processing on the high-pass filtering signal at the same moment by adopting the modulation amplitude at each moment, the beat on loudness can be formed in a high-frequency part where the binaural beat cannot take effect by a beat amplitude modulation mode, so as to make up for the problem that the human ear lacks sensitivity in the high-frequency part.
Further, the binaural beat frequency difference may include a start binaural beat frequency difference and an end binaural beat frequency difference; using the binaural beat frequency difference, the step of generating a binaural beat audio signal may comprise: according to the duration of the audio signal to be processed, performing time-frequency calculation to determine a binaural beat frequency difference at each moment, wherein the binaural beat frequency difference is uniformly changed from the starting binaural beat frequency difference to the ending binaural beat frequency difference in a one-way manner; and generating a binaural beat audio signal at the same time by using the binaural beat frequency difference at each time.
In the embodiment of the present invention, by setting the binaural beat frequency difference that changes uniformly in a single direction from the start binaural beat frequency difference to the end binaural beat frequency difference, the binaural beat frequency difference at each time can be determined through time-frequency calculation, so that the binaural beat frequency difference can be set more flexibly, and the frequency shift effect can be further improved.
In step S32, the amplitude-modulated high-frequency signal and the frequency-shifted low-frequency signal are mixed to obtain an audio signal after the mixing process.
In the embodiment of the invention, the audio signal after the audio mixing processing is obtained by performing audio mixing processing on the amplitude-modulated high-frequency signal and the frequency-shifted low-frequency signal, so that the fusion of binaural beats and music can be further enhanced through a more complicated signal processing mode, and the listening comfort and the binaural beat effect are improved.
In the embodiment of the invention, the audio signal is filtered to be divided into the low-frequency part and the high-frequency part, the frequency shift processing is additionally added to the low-frequency part, and then the audio signal is mixed with the high-frequency part, so that the frequency difference of the obtained brain wave induced music is obtained by processing the low-frequency part which is more sensitive to human ears.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an audio signal processing apparatus according to an embodiment of the present invention. The audio signal processing apparatus may include:
a signal receiving module 41 adapted to receive an audio signal to be processed;
a filtering processing module 42, adapted to perform a low-pass filtering process and a high-pass filtering process on the audio signal respectively to obtain a low-pass filtered signal and a high-pass filtered signal;
a frequency shift processing module 43, adapted to perform frequency shift processing on the low-pass filtered signal to obtain a frequency-shifted low-frequency signal;
a sound mixing processing module 44, adapted to obtain an audio signal after sound mixing processing according to the frequency-shifted low-pass filtered signal and the high-pass filtered signal;
wherein the frequency of the low-pass filtered signal is lower than a first preset frequency; the frequency of the high-pass filtering signal is higher than or equal to the first preset frequency.
For the principle, specific implementation and beneficial effects of the audio signal processing apparatus, please refer to the foregoing and the related descriptions of the audio signal processing method shown in fig. 1 to 3, which are not repeated herein.
In the embodiment of the invention, the audio signal is filtered to be divided into the low-frequency part and the high-frequency part, the frequency shift processing is additionally added to the low-frequency part, and then the audio signal is mixed with the high-frequency part, so that the frequency difference of the obtained brain wave induced music is obtained by processing the low-frequency part which is more sensitive to human ears.
Referring to fig. 5, fig. 5 is a schematic view of an operation scenario of another audio signal processing apparatus according to an embodiment of the present invention.
As shown in fig. 5, a binaural beat frequency 501 and an audio signal 511 to be processed may be predetermined.
Further, the binaural beat frequency 501 is input to a time-frequency calculator 502 to perform time-frequency calculation and determine a binaural beat frequency difference at each time. The respective time instants of the binaural beat frequency difference may then be input to a binaural beat generator 503 to generate a binaural beat audio signal and determine a modulation amplitude for the respective time instants of the binaural beat audio signal.
The audio signal 511 to be processed is input to a low-pass filter 512 to obtain a low-pass filtered signal and to a high-pass filter 514 to obtain a high-pass filtered signal, respectively.
Further, the low-pass filtered signal is input to a frequency shifter 513 to obtain a frequency-shifted low-frequency signal, and a frequency shifted by the frequency shifter 513 is determined according to a binaural beat frequency difference at each time output by the time-frequency calculator 502.
And inputting the high-pass filtering signal into an amplitude modulator 515 to obtain an amplitude-modulated high-frequency signal, wherein the amplitude modulated by the amplitude modulator 515 is determined according to the modulation amplitude of each time of the binaural beat audio signal.
The amplitude-modulated high-frequency signal and the frequency-shifted low-frequency signal are input to a mixer 516, so as to obtain an audio signal 517 to be output.
For the principle, specific implementation and beneficial effects of the other audio signal processing apparatus, please refer to the foregoing and the related descriptions about the audio signal processing method shown in fig. 1 to 3, which are not repeated herein.
The embodiment of the invention also provides a storage medium, wherein computer instructions are stored on the storage medium, and when the computer instructions are operated, the steps of the audio signal processing method are executed. The storage medium may be a computer-readable storage medium, and may include, for example, a non-volatile (non-volatile) or non-transitory (non-transitory) memory, and may further include an optical disc, a mechanical hard disk, a solid state hard disk, and the like.
The embodiment of the invention also provides a terminal, which comprises a memory and a processor, wherein the memory is stored with computer instructions capable of running on the processor, and the processor executes the steps of the audio signal processing method when running the computer instructions. The terminal includes, but is not limited to, a mobile phone, a computer, a tablet computer and other terminal devices.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method of processing an audio signal, comprising the steps of:
receiving an audio signal to be processed;
respectively carrying out low-pass filtering processing and high-pass filtering processing on the audio signal to obtain a low-pass filtering signal and a high-pass filtering signal;
performing frequency shift processing on the low-pass filtering signal to obtain a low-frequency signal after frequency shift;
obtaining an audio signal after sound mixing processing according to the low-pass filtering signal and the high-pass filtering signal after frequency shift;
wherein the frequency of the low-pass filtered signal is lower than a first preset frequency; the frequency of the high-pass filtering signal is higher than or equal to the first preset frequency.
2. The method of processing an audio signal according to claim 1, wherein the first predetermined frequency is 980 Hz.
3. The method of claim 1, wherein obtaining the audio signal after the audio mixing process according to the shifted low-pass filtered signal and the high-pass filtered signal comprises:
carrying out amplitude modulation processing on the high-pass filtering signal to obtain an amplitude-modulated high-frequency signal;
and carrying out sound mixing processing on the amplitude-modulated high-frequency signal and the frequency-shifted low-frequency signal to obtain an audio signal after the sound mixing processing.
4. A method of processing an audio signal according to claim 3, wherein amplitude modulating the high-pass filtered signal comprises:
determining a binaural beat frequency difference;
generating a binaural beat audio signal by adopting the binaural beat frequency difference;
and determining the modulation amplitude of each moment of the binaural beat audio signal, and carrying out amplitude modulation processing on the high-pass filtering signal at the same moment by adopting the modulation amplitude of each moment.
5. The method of processing an audio signal according to claim 4, wherein the binaural beat frequency difference comprises a start binaural beat frequency difference and an end binaural beat frequency difference;
generating a binaural beat audio signal using the binaural beat frequency difference comprises:
according to the duration of the audio signal to be processed, performing time-frequency calculation to determine a binaural beat frequency difference at each moment, wherein the binaural beat frequency difference is uniformly changed from the starting binaural beat frequency difference to the ending binaural beat frequency difference in a one-way manner;
and generating a binaural beat audio signal at the same time by using the binaural beat frequency difference at each time.
6. The method of processing an audio signal according to claim 1, wherein the low-pass filtered signal comprises a low-frequency left channel signal and a low-frequency right channel signal;
the frequency shift processing of the low-pass filtered signal comprises:
determining a binaural beat frequency difference at each time instant;
shifting the low frequency left channel signal at each time by one half of the binaural beat frequency difference at the same time in the positive direction, and shifting the low frequency right channel signal by one half of the binaural beat frequency difference at the same time in the negative direction;
or,
for each time instant, the low frequency right channel signal is shifted positively by one half of the binaural beat frequency difference at the same time instant, and for each time instant, the low frequency left channel signal is shifted negatively by one half of the binaural beat frequency difference at the same time instant.
7. The method of claim 6, wherein the binaural beat frequency comprises a start binaural beat frequency difference and an end binaural beat frequency difference;
determining a binaural beat frequency difference for each time instant comprises:
and performing time-frequency calculation according to the duration of the audio signal to be processed to determine a binaural beat frequency difference at each moment, wherein the binaural beat frequency difference is uniformly changed from the starting binaural beat frequency difference to the ending binaural beat frequency difference in a one-way manner.
8. An apparatus for processing an audio signal, comprising:
the signal receiving module is suitable for receiving an audio signal to be processed;
the filtering processing module is suitable for respectively carrying out low-pass filtering processing and high-pass filtering processing on the audio signal so as to obtain a low-pass filtering signal and a high-pass filtering signal;
the frequency shift processing module is suitable for performing frequency shift processing on the low-pass filtering signal to obtain a frequency-shifted low-frequency signal;
the audio mixing processing module is suitable for obtaining an audio signal after audio mixing processing according to the low-pass filtering signal and the high-pass filtering signal after frequency shifting;
wherein the frequency of the low-pass filtered signal is lower than a first preset frequency; the frequency of the high-pass filtering signal is higher than or equal to the first preset frequency.
9. A storage medium having stored thereon computer instructions, characterized in that the computer instructions are operative to perform the steps of the method of processing an audio signal according to any one of claims 1 to 7.
10. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of processing an audio signal according to any one of claims 1 to 7.
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