CN111615046A - Audio signal processing method and device and computer readable storage medium - Google Patents
Audio signal processing method and device and computer readable storage medium Download PDFInfo
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Abstract
The embodiment of the application discloses an audio signal processing method and device and a computer readable storage medium, wherein the method comprises the following steps: the method comprises the steps of obtaining a first audio signal and a second audio signal of an original audio signal, wherein the audio signals comprise a left channel signal and a right channel signal, the first audio signal is a signal with the same left channel signal and right channel signal, the second audio signal is a background audio signal, carrying out frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a frequency modulation signal, the frequency of the frequency modulation signal is lower than that of the low-frequency signal, obtaining a sound mixing audio signal according to the frequency modulation signal and the second audio signal, and outputting the sound mixing audio signal and the original audio signal respectively. By the embodiment, the corresponding binaural beat signal can be constructed under the condition of ensuring the quality of the original audio signal.
Description
Technical Field
The present application relates to the field of audio technologies, and in particular, to an audio signal processing method and apparatus, and a computer-readable storage medium.
Background
Binaural beat is a psychological effect, which means that when the listener receives the same music with slightly different frequencies at the same time, the sound of the third frequency emerges from the brain. The principle of the method is that the left ear and the right ear of a listener respectively receive two sound waves with slightly different frequencies at the same time, so that the brain of the listener integrates the two sound waves, and the brain of the listener can perceive the sound with the third frequency. Binaural beat music may relieve the listener from anxiety, causing the listener to enter a relaxed state.
How to construct an audio signal capable of generating a binaural beat effect is a hot issue of current research.
Disclosure of Invention
The embodiment of the application discloses an audio signal processing method and device and a computer readable storage medium, which can construct corresponding binaural beat signals under the condition of ensuring the quality of original audio signals.
In a first aspect, an embodiment of the present application provides an audio signal processing method, where the method includes:
acquiring a first audio signal and a second audio signal of an original audio signal, wherein the original audio signal comprises a left channel signal and a right channel signal, the first audio signal is a signal of which the left channel signal is the same as the right channel signal, and the second audio signal is a background audio signal;
performing frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a frequency-modulated signal;
obtaining a mixed audio signal according to the frequency modulation signal and the second audio signal;
and respectively outputting the mixed audio signal and the original audio signal.
In a second aspect, an embodiment of the present application provides another audio signal processing method, including:
acquiring a first audio signal and a second audio signal of an original audio signal, wherein the original audio signal comprises a left channel signal and a right channel signal, the first audio signal is a signal of which the left channel signal is the same as the right channel signal, and the second audio signal is a background audio signal;
performing frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a first frequency modulation signal and a second frequency modulation signal;
obtaining a first audio-mixing audio signal according to the first frequency modulation signal and the second audio signal, and obtaining a second audio-mixing audio signal according to the second frequency modulation signal and the second audio signal;
and respectively outputting the first mixed audio signal and the second mixed audio signal.
In a third aspect, an embodiment of the present application provides an audio signal processing apparatus, including:
the processing unit is used for acquiring a first audio signal and a second audio signal of an original audio signal, wherein the original audio signal comprises a left channel signal and a right channel signal, the first audio signal is the same signal as the left channel signal and the right channel signal, and the second audio signal is a background audio signal; performing frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a frequency-modulated signal, wherein the frequency of the frequency-modulated signal is lower than that of the low-frequency signal; obtaining a mixed audio signal according to the frequency modulation signal and the second audio signal;
an output unit for outputting the mixed audio signal and the original audio signal, respectively.
In a fourth aspect, an embodiment of the present application provides another audio signal processing apparatus, including:
the processing unit is used for acquiring a first audio signal and a second audio signal of an original audio signal, wherein the original audio signal comprises a left channel signal and a right channel signal, the first audio signal is the same signal as the left channel signal and the right channel signal, and the second audio signal is a background audio signal; performing frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a first frequency modulation signal and a second frequency modulation signal; obtaining a first audio-mixing audio signal according to the first frequency modulation signal and the second audio signal, and obtaining a second audio-mixing audio signal according to the second frequency modulation signal and the second audio signal;
an output unit for outputting the first mixed audio signal and the second mixed audio signal, respectively.
In a fifth aspect, an embodiment of the present application provides an audio signal processing apparatus, including a processor, a memory, and an input/output module; wherein the memory is configured to store a computer program comprising program instructions, the input-output module is configured to transmit an audio signal, and the processor is configured to call the program instructions to perform the method according to the first or second aspect.
In a sixth aspect, embodiments of the present application provide a computer-readable storage medium, which stores one or more instructions adapted to be loaded by a processor and execute the method of the first or second aspect.
In the embodiment of the application, a frequency modulation signal is obtained by performing frequency modulation on a low-frequency signal corresponding to a first audio signal in an obtained original audio signal, the frequency of the frequency modulation signal is lower than that of the low-frequency signal, a mixed audio signal is obtained according to the frequency modulation signal and the original audio signal, and the mixed audio signal and the original audio signal are respectively output. Therefore, the original effect of the background sound can be reserved only by processing the low-frequency signal corresponding to the first audio signal. The low-frequency signal is adjusted to be low, so that the high-frequency signals corresponding to the first audio signal can be prevented from being overlapped and interfering with each other. By the embodiment, the corresponding binaural beat signal can be constructed under the condition of ensuring the quality of the original audio signal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1a is an exemplary diagram of a current scenario in which a listener listens to an original audio signal;
FIG. 1b is a diagram of an example of a listener listening to a processed audio signal according to an embodiment of the present application;
fig. 2 is a schematic flowchart of an audio signal processing method according to an embodiment of the present application;
FIG. 3 is an exemplary diagram of frequency modulation provided by an embodiment of the present application;
fig. 4 is a schematic flowchart of another audio signal processing method provided in the embodiment of the present application;
fig. 5 is a schematic structural diagram of a node processing apparatus according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a node processing device according to an embodiment of the present application.
Detailed Description
In order to better understand the embodiments of the present application, the following description is provided for the applicable scenarios of the embodiments of the present application.
The embodiment of the application can be applied to a scene that an audio signal processing device processes an audio signal. The audio signal processing apparatus may include, but is not limited to, a mobile phone, a desktop computer, a portable computer, a tablet computer, a Compact Disc (CD) player, an MP3/4, a wearable device, and other apparatuses or devices capable of processing and outputting audio signals. In the exemplary diagrams shown in fig. 1a and 1b, the audio signal processing apparatus and the audio signal transmission medium are exemplified by a mobile phone and a wired headset, respectively. The transmission medium may also be a wireless headset or an audio signal transmission medium carried on a wearable device. In addition, the audio signal can also be directly output through sound.
Fig. 1a is an exemplary diagram of a current scenario in which a listener listens to an original audio signal. As shown in fig. 1a, the audio signal heard by the listener through the headphones may be a two-channel audio signal in which the left and right audio signals have the same portion, such as a stereo audio signal. The audio signal combines the direct sound and reverberant sound through the two channels to restore the spatial impression of the sound in the real scene, thereby creating a better listening experience for the listener. In fig. 1a, the signals transmitted by the left channel and the right channel have the same frequency at the same time, for example, both frequencies are f 1.
Fig. 1b is a diagram of an example of a scene in which a listener listens to a processed audio signal according to an embodiment of the present application. As shown in fig. 1b, the audio signal heard by the listener through the headphones may also be a two-channel audio signal in which the same portion of the left and right audio signals is present. Unlike fig. 1a, in fig. 1b, the signals transmitted by the left channel and the right channel have different frequencies at the same time, for example, one frequency is f1, and the other frequency is f 2. Because the frequencies are different, the brain of the listener can perceive the sound of the third frequency, so that the binaural beat is constructed.
The binaural beat is to modulate signals in the left channel or the right channel, and to make the left ear and the right ear of a listener respectively receive two sound waves with slightly different frequencies at the same time. When the left and right ears of the listener hear the sounds with different frequencies, the brain integrates the two sound waves, so that the brain of the listener perceives the sounds with a third frequency. Sounds at the third frequency may cause the listener to perceive that the sound is being emitted from the brain, rather than being heard by the ears. Studies have shown that binaural beat music can relieve the listener from anxiety, causing the listener to enter a relaxed state.
For example, when the processed audio signal is song a, the signals transmitted by the left and right channels may have a portion of the same signal and a portion of different signals. The same signal contains the human voice part and the different signal contains the background voice part. After the audio signal processing method provided by the embodiment of the application is adopted to process the song, the frequencies of the signals transmitted by the left and right sound channels at the same moment are different, so that the effect of constructing the binaural beats in the mind of a listener is achieved. The following describes the audio signal processing method provided in the embodiments of the present application in detail.
Referring to fig. 2, fig. 2 is a schematic flowchart of an audio signal processing method according to an embodiment of the present application, which may include, but is not limited to, the following steps:
201. the audio signal processing apparatus acquires a first audio signal and a second audio signal of an original audio signal.
Wherein the original audio signal is a two-channel audio signal in which the left and right audio signals have the same portion, such as a stereo audio signal. The original audio signal may be any song selected by the user, that is, in the case of receiving a song selection instruction input by the user, the song corresponding to the selection instruction is acquired, and the processing in steps 201 to 204 is performed on the song. The original audio signal may also be any song in the song library, i.e. the audio signal processing means may perform the processing as in steps 201-204 on any song in the song library.
Specifically, the audio signal processing apparatus obtains a first audio signal and a second audio signal according to the original audio signal, where the first audio signal is a signal in which a left channel signal and a right channel signal are the same, and the second audio signal is a background sound signal. The first audio signal, the second audio signal of the left channel, and the second audio signal of the right channel may be specifically obtained by the following formulas:
S1＝(L+R)/2
S2＝(L-R)/2
S3＝(R-L)/2
wherein S1 is the first audio signal, S2 is the second audio signal of the left channel, S3 is the second audio signal of the right channel, L is the left channel signal, and R is the right channel signal. It can be seen that the left channel signal of the original audio signal is commonly composed of S1 and S2, and the right channel signal of the original audio signal is commonly composed of S1 and S3.
202. The audio signal processing device performs frequency modulation on the low-frequency signal corresponding to the first audio signal to obtain a frequency modulation signal.
In a first implementation manner, the audio signal processing apparatus first performs frequency division on the first audio signal according to a frequency division point to obtain a low-frequency signal corresponding to the first audio signal and a high-frequency signal corresponding to the first audio signal. The frequency corresponding to the frequency dividing point is greater than the lower limit of the frequency of the first audio signal, and the frequency corresponding to the frequency dividing point can be dynamically set according to different audio signals. For example, the frequency corresponding to the crossover point may be set as an average of a lower frequency limit of the first audio signal and an upper frequency limit of the first audio signal; or, the frequency corresponding to the frequency dividing point may be set as the sum of the lower frequency limit of the first audio signal and a preset frequency dividing threshold, where the preset frequency dividing threshold is a positive number; alternatively, the frequency corresponding to the frequency dividing point may be set as the difference between the upper frequency limit of the first audio signal and the preset frequency dividing threshold.
In particular, the frequency halving of the first audio signal may be achieved by a linkworm-rayleigh (L-R) filter. For example, the frequency range of the first audio signal is [100,500] Hz, the lower frequency limit of the first audio signal is 100Hz, and the upper frequency limit of the first audio signal is 500 Hz. If the frequency corresponding to the frequency division point is 240Hz, the audio signal processing device can divide the frequency of the first audio signal by two through a linkwey-rayleigh (L-R) filter to obtain a low-frequency signal frequency range [100,240 ] Hz corresponding to the first audio signal and a high-frequency signal frequency range [240,500] Hz corresponding to the first audio signal.
Then, the audio signal processing device performs frequency modulation on the low-frequency signal corresponding to the first audio signal by using Hilbert transform to obtain a modulated frequency modulation signal. In particular, reference may be made to the exemplary diagram of frequency modulation shown in fig. 3. In fig. 3, the audio signal processing apparatus obtains a first sine signal sin (wt) and a first cosine signal cos (wt) of a low-frequency signal w corresponding to a first audio signal through hilbert transform, and generates a second sine signal sin (dwt) and a second cosine signal cos (dwt) corresponding to a frequency modulation frequency dw through a signal generator. Wherein the frequency-modulated frequency dw is a positive number. The hilbert transform may be implemented by a Finite Impulse Response (FIR) filtering form. It should be noted that the larger the value of the frequency modulation frequency, the larger the amplitude of the frequency modulation. When the fm frequency is too large, the quality of the original audio signal is affected, and the binaural beat effect also disappears due to too large frequency difference between the fm signal and the low-frequency signal corresponding to the first audio signal.
In one embodiment, the audio signal processing apparatus adds the product of the first sine signal and the second sine signal to the product of the first cosine signal and the second cosine signal to obtain the frequency modulation signal. The specific calculation formula is as follows:
cos(wt)cos(dwt)+sin(wt)sin(dwt)＝cos((w-dw)t)
for example, assuming that the frequency range of the low-frequency signal corresponding to the first audio signal is [100,200] Hz and the frequency dw is 5Hz, the frequency range of the frequency-modulated signal obtained by frequency-modulating the low-frequency signal corresponding to the first audio signal through hilbert transform is [95,195] Hz.
In another embodiment, the audio signal processing apparatus subtracts the product of the first sine signal and the second sine signal from the product of the first cosine signal and the second cosine signal to obtain the frequency-modulated signal. The specific calculation formula is as follows:
cos(wt)cos(dwt)-sin(wt)sin(dwt)＝cos((w+dw)t)
for example, assuming that the frequency range of the low-frequency signal corresponding to the first audio signal is [100,200] Hz and the frequency dw is 5Hz, the frequency range of the frequency-modulated signal obtained by frequency-modulating the low-frequency signal corresponding to the first audio signal through hilbert transform is [105,205] Hz.
In a second implementation manner, if the frequency corresponding to the frequency dividing point is greater than the upper frequency limit of the first audio signal, that is, the entire first audio signal belongs to the low-frequency signal corresponding to the first audio signal. The audio signal processing device directly performs frequency modulation on the first audio signal to obtain a frequency modulated signal. For example, the frequency range of the first audio signal is [100,200] Hz, the lower frequency limit of the first audio signal is 100Hz, and the upper frequency limit of the first audio signal is 200 Hz. The frequency corresponding to the frequency division point is assumed to be 240Hz, and the frequency modulation frequency is 3 Hz. Because the frequency corresponding to the frequency dividing point is greater than the upper frequency limit of the first audio signal, the whole first audio signal belongs to the low-frequency signal corresponding to the first audio signal. After the first audio signal is frequency modulated by Hilbert transform, the frequency range of the obtained frequency modulated signal is [97,197] Hz.
203. And the audio signal processing device obtains a mixed audio signal according to the frequency modulation signal and the second audio signal.
Corresponding to the first implementation of step 202, the audio signal processing apparatus first calculates a delay of the frequency modulated signal with respect to a low frequency signal corresponding to the first audio signal before frequency modulation. And then, aligning the time of the frequency modulation signal with the high-frequency signal corresponding to the first audio signal according to the delay, and mixing the time-aligned frequency modulation signal with the high-frequency signal corresponding to the first audio signal to obtain an intermediate audio signal. And then, aligning the time of the intermediate audio signal with the time of the second audio signal according to the delay, and mixing the time-aligned intermediate audio signal with the second audio signal to obtain a mixed audio signal. Specifically, the audio signal processing apparatus may align the time of the intermediate audio signal with the time of the second audio signal of the left channel according to the delay, and perform audio mixing on the intermediate audio signal and the second audio signal of the left channel to obtain an audio-mixed audio signal; alternatively, the audio signal processing apparatus may align the time of the intermediate audio signal with the time of the second audio signal of the right channel according to the delay, and mix the intermediate audio signal with the second audio signal of the right channel to obtain a mixed audio signal.
For example, assuming that the length of the hilbert FIR filter is 2 × N +1, the delay of the frequency modulated signal with respect to the low frequency signal corresponding to the first audio signal is N. Therefore, it is necessary to pass the high frequency signal corresponding to the first audio signal through a delay line having a length of N so that the high frequency signal corresponding to the first audio signal is time-aligned with the frequency modulation signal. Then, the audio signal processing device mixes the time-aligned frequency modulation signal with a high-frequency signal corresponding to the first audio signal to obtain an intermediate audio signal. Similarly, the second audio signal also needs to be time-aligned with the intermediate audio signal according to the delay N before being mixed with the intermediate audio signal.
Corresponding to the second implementation manner of step 202, if the frequency (preset frequency threshold) corresponding to the frequency division point is greater than the upper frequency limit of the first audio signal, that is, the entire first audio signal belongs to the low-frequency signal corresponding to the first audio signal, in step 202, the audio signal processing device directly performs frequency modulation on the first audio signal to obtain the frequency-modulated signal. The audio signal processing means first calculates the delay of the frequency modulated signal relative to the second audio signal. And then, aligning the time of the frequency modulation signal with the time of the second audio signal according to the delay, and mixing the time-aligned frequency modulation signal with the second audio signal to obtain a mixed audio signal. Specifically, the audio signal processing apparatus may align the time of the frequency modulation signal with the time of the second audio signal of the left channel according to the delay, and perform audio mixing on the frequency modulation signal and the second audio signal of the left channel to obtain an audio-mixed audio signal; alternatively, the audio signal processing apparatus may align the time of the frequency modulation signal with the time of the second audio signal of the right channel according to the delay, and mix the frequency modulation signal with the second audio signal of the right channel to obtain a mixed audio signal.
204. The audio signal processing apparatus outputs a mixed audio signal and an original audio signal, respectively.
If the audio-mixed audio signal is obtained by mixing the frequency-modulated signal and the second audio signal of the left channel, the audio signal processing apparatus first time aligns the right channel signal of the original audio signal with the audio-mixed audio signal according to the delay calculated in step 203. The mixed audio signal is output on the left channel, and the right channel signal of the original audio signal after time alignment with the mixed audio is output on the right channel. If the audio-mixed audio signal is obtained by mixing the frequency-modulated signal and the second audio signal of the right channel, the audio signal processing apparatus first aligns the left channel signal of the original audio signal with the audio-mixed audio signal according to the delay calculated in step 203. And outputting the mixed audio signal at the right channel, and outputting the left channel signal of the original audio signal after time alignment with the mixed audio at the left channel.
It can be seen that by implementing the method described in fig. 2, the audio signal processing apparatus performs frequency modulation on the low-frequency signal corresponding to the first audio signal in the audio signal, so as to retain the original effect of the background sound. The frequency of the low-frequency signal corresponding to the first audio signal is wholly reduced through the frequency modulation frequency, so that the condition that the frequency modulation signal and the high-frequency signal corresponding to the first audio signal are partially overlapped and mutually interfered when in sound mixing can be avoided. Therefore, by the present embodiment, it is possible to construct its corresponding binaural beat signal while guaranteeing the quality of the original audio signal.
Referring to fig. 4, fig. 4 is a schematic flowchart of another audio signal processing method according to an embodiment of the present application, which may include, but is not limited to, the following steps:
401. the audio signal processing apparatus acquires a first audio signal and a second audio signal of an original audio signal.
The specific implementation of step 401 is the same as that of step 201 in fig. 2, and is not described herein again.
402. The audio signal processing device performs frequency modulation on the low-frequency signal corresponding to the first audio signal to obtain a first frequency modulation signal and a second frequency modulation signal.
The frequencies of the first frequency modulation signal and the second frequency modulation signal are both lower than the low-frequency signal corresponding to the first audio signal, and the frequency difference between the first frequency modulation signal and the second frequency modulation signal is smaller than a frequency difference threshold value M. It should be noted that when M is too large, the binaural beat effect disappears because the frequencies of the first frequency modulation signal and the second frequency modulation signal are too different.
In a first implementation manner, the audio signal processing apparatus first performs frequency division on the first audio signal according to a frequency division point to obtain a low-frequency signal corresponding to the first audio signal and a high-frequency signal corresponding to the first audio signal. The frequency corresponding to the frequency dividing point is greater than the lower limit of the frequency of the first audio signal, and the frequency corresponding to the frequency dividing point can be dynamically set according to different audio signals. For example, the frequency corresponding to the crossover point may be set as an average of a lower frequency limit of the first audio signal and an upper frequency limit of the first audio signal; or, the frequency corresponding to the frequency dividing point may be set as the sum of the lower frequency limit of the first audio signal and a preset frequency dividing threshold, where the preset frequency dividing threshold is a positive number; alternatively, the frequency corresponding to the frequency dividing point may be set as the difference between the upper frequency limit of the first audio signal and the preset frequency dividing threshold.
In particular, the frequency halving of the first audio signal may be achieved by a linkworm-rayleigh (L-R) filter. For example, the frequency range of the first audio signal is [100,500] Hz, the lower frequency limit of the first audio signal is 100Hz, and the upper frequency limit of the first audio signal is 500 Hz. If the frequency corresponding to the frequency division point is 240Hz, the audio signal processing device can divide the frequency of the first audio signal by two through a linkwey-rayleigh (L-R) filter to obtain a low-frequency signal frequency range [100,240 ] Hz corresponding to the first audio signal and a high-frequency signal frequency range [240,500] Hz corresponding to the first audio signal.
Then, the audio signal processing device performs frequency modulation twice on the low-frequency signal corresponding to the first audio signal by using Hilbert transform to obtain a modulated first frequency modulation signal and a modulated second frequency modulation signal. In particular, reference may be made to the exemplary diagram of frequency modulation shown in fig. 3. In fig. 3, the audio signal processing apparatus obtains a first sine signal sin (wt) and a first cosine signal cos (wt) of a low-frequency signal w corresponding to a first audio signal through hilbert transform, and generates a second sine signal sin (dwt) and a second cosine signal cos (dwt) corresponding to a frequency modulation frequency dw through a signal generator. Wherein, the frequency-modulated frequency dw is a positive number, and the relationship between the first frequency-modulated frequency dw1 of the first secondary frequency modulation and the second frequency-modulated frequency dw2 of the second secondary frequency modulation is: 0< | dw1-dw2| < M. The hilbert transform may be implemented by a Finite Impulse Response (FIR) filtering form. It should be noted that the larger the value of the frequency modulation frequency, the larger the amplitude of the frequency modulation. When the fm frequency is too large, the quality of the original audio signal is affected, and the binaural beat effect also disappears due to too large frequency difference between the fm signal and the low-frequency signal corresponding to the first audio signal.
In one embodiment, the frequency modulation signal is obtained by adding a product of the first sine signal and the second sine signal to a product of the first cosine signal and the second cosine signal, and the audio signal processing device performs frequency modulation twice on the low-frequency signal by using the first frequency modulation frequency dw1 and the second frequency modulation frequency dw2 respectively to obtain the modulated first frequency modulation signal and the modulated second frequency modulation signal. The specific calculation formula is as follows:
cos(wt)cos(dw1t)+sin(wt)sin(dw1t)＝cos((w–dw1)t)
cos(wt)cos(dw2t)+sin(wt)sin(dw2t)＝cos((w–dw2)t)
for example, assuming that the frequency range of the low-frequency signal corresponding to the first audio signal is [100,200] Hz, the first frequency-modulation frequency dw1 is 5Hz, and the first frequency-modulation frequency dw2 is 3Hz, the frequency of the low-frequency signal corresponding to the first audio signal is modulated by hilbert transform, and the frequency range of the obtained first frequency-modulation signal is [95,195] Hz, and the frequency range of the second frequency-modulation signal is [97,197] Hz.
In another embodiment, a frequency modulation signal is obtained by subtracting a product of the first sine signal and the second sine signal from a product of the first cosine signal and the second cosine signal, and the audio signal processing device performs two-time frequency modulation on the low-frequency signal by using the first frequency modulation frequency dw1 and the second frequency modulation frequency dw2, respectively, to obtain the modulated first frequency modulation signal and the modulated second frequency modulation signal. The specific calculation formula is as follows:
cos(wt)cos(dw1t)-sin(wt)sin(dw1t)＝cos((w+dw1)t)
cos(wt)cos(dw2t)-sin(wt)sin(dw2t)＝cos((w+dw2)t)
for example, assuming that the frequency range of the low-frequency signal corresponding to the first audio signal is [100,200] Hz, the first frequency-modulation frequency dw1 is 5Hz, and the first frequency-modulation frequency dw2 is 3Hz, the frequency of the low-frequency signal corresponding to the first audio signal is modulated by hilbert transform, and the frequency range of the obtained first frequency-modulation signal is [105,205] Hz, and the frequency range of the second frequency-modulation signal is [103,203] Hz.
In a second implementation manner, if the frequency corresponding to the frequency dividing point is greater than the upper frequency limit of the first audio signal, that is, the entire first audio signal belongs to the low-frequency signal corresponding to the first audio signal. The audio signal processing device directly performs frequency modulation on the first audio signal to obtain a frequency modulated signal. For example, the frequency range of the first audio signal is [100,200] Hz, the lower frequency limit of the first audio signal is 100Hz, and the upper frequency limit of the first audio signal is 200 Hz. The frequency corresponding to the frequency division point is assumed to be 240Hz, the first frequency modulation frequency is 5Hz, and the second frequency modulation frequency is 3 Hz. Because the frequency corresponding to the frequency dividing point is greater than the upper frequency limit of the first audio signal, the whole first audio signal belongs to the low-frequency signal corresponding to the first audio signal. And performing frequency modulation on the first audio signal by adding the product of the first sine signal and the second sine signal and the product of the first cosine signal and the second cosine signal to obtain a first frequency modulation signal with a frequency range of [95,195] Hz and a second frequency modulation signal with a frequency range of [97,197] Hz. And performing frequency modulation on the first audio signal by subtracting the product of the first sine signal and the second sine signal from the product of the first cosine signal and the second cosine signal to obtain a first frequency modulation signal with a frequency range of [105,205] Hz and a second frequency modulation signal with a frequency range of [103,203] Hz.
403. The audio signal processing device obtains a first audio mixing audio signal according to the first frequency modulation signal and the second audio signal, and obtains a second audio mixing audio signal according to the second frequency modulation signal and the second audio signal.
Corresponding to the first implementation manner of step 402, the audio signal processing apparatus first calculates a first delay of the first fm signal relative to the low-frequency signal corresponding to the first audio signal before frequency modulation, and a second delay of the second fm signal relative to the low-frequency signal corresponding to the first audio signal before frequency modulation. The first modulated frequency signal is then time aligned with a high frequency signal corresponding to the first audio signal according to the first delay, and the second modulated frequency signal is time aligned with a high frequency signal corresponding to the first audio signal according to the second delay. Mixing the time-aligned first frequency modulation signal with a high-frequency signal corresponding to the first audio signal to obtain a first intermediate audio signal; and mixing the second frequency modulation signal after time alignment with the high-frequency signal corresponding to the first audio signal to obtain a second intermediate audio signal. The first intermediate audio signal is then time aligned with the second audio signal according to a first delay, and the second intermediate audio signal is time aligned with the second audio signal according to a second delay. Mixing the first intermediate audio signal and the second audio signal after time alignment to obtain a first mixed audio signal; and mixing the second intermediate audio signal after time alignment with the second audio signal to obtain a second mixed audio signal.
Corresponding to the second implementation manner of step 402, the frequency corresponding to the frequency division point is greater than the upper frequency limit of the first audio signal, that is, the entire first audio signal belongs to the low-frequency signal corresponding to the first audio signal, and in step 402, the audio signal processing apparatus directly performs frequency modulation on the first audio signal to obtain the first frequency modulation signal and the second frequency modulation signal. The audio signal processing device first calculates a first delay of the first frequency modulation signal relative to the first audio signal before frequency modulation, and a second delay of the second frequency modulation signal relative to the first audio signal before frequency modulation. The first modulated frequency signal is then time aligned with the second audio signal according to the first delay and the second modulated frequency signal is time aligned with the second audio signal according to the second delay. Mixing the first frequency modulation signal and the second audio signal after time alignment to obtain a first mixed audio signal; and mixing the second frequency modulation signal after time alignment with a second audio signal to obtain a second mixed audio signal.
For example, the first modulated frequency signal is delayed by X relative to the first audio signal. Therefore, the second audio signal needs to be passed through a delay line of length X so that the first modulated frequency signal is time-aligned with the second audio signal. Then, the audio signal processing device mixes the time-aligned first frequency modulation signal with the second audio signal to obtain a first mixed audio signal. Similarly, before the second fm signal is mixed with the second audio signal, the second fm signal and the second audio signal need to be time-aligned according to the delay Y of the second fm signal relative to the first audio signal.
404. The audio signal processing apparatus outputs a first mixed audio signal and a second mixed audio signal, respectively.
Wherein the audio signal processing apparatus calculates a relative delay of the first mixed audio signal and the second mixed audio signal. If the relative delay is 0, the audio signal processing apparatus outputs the first mixed audio signal and the second mixed audio signal in the left and right channels, respectively. And if the relative delay is not 0, time-aligning the first mixed audio signal and the second mixed audio signal according to the relative delay. The first mixed audio signal and the second mixed audio signal after time alignment are respectively output in the left channel and the right channel.
It can be seen that the method described in fig. 4 differs from the method of fig. 2 in that fig. 2 is implemented in that only the audio signals of one of the left and right channels are frequency modulated and the audio signals of the other channel are time aligned by time delay. Fig. 4 is implemented to perform frequency modulation processing on audio signals on both sides of the left and right channels. The side that is frequency modulated implementing the method of fig. 2 will lose the effect of binaural beats when the frequency modulation amplitude exceeds the frequency modulation threshold. When the frequency modulation amplitude of one side exceeds the frequency modulation threshold value, the other side can perform corresponding frequency modulation by implementing the method of fig. 4, so that the binaural beat effect is ensured not to disappear. The method can process the audio signal more flexibly.
While the method of the embodiments of the present application has been described in detail above, to facilitate better implementation of the above-described aspects of the embodiments of the present application, the apparatus of the embodiments of the present application is provided below accordingly.
Referring to fig. 5, fig. 5 is a schematic structural diagram of an audio signal processing apparatus according to an embodiment of the present disclosure, where the audio signal processing apparatus may be mounted on a terminal device or a two-channel audio output device. The audio signal processing apparatus shown in fig. 5 may be used to perform some or all of the functions in the method embodiments described above with reference to fig. 2 or fig. 4. Wherein, the detailed description of each unit is as follows:
a processing unit 501, configured to obtain a first audio signal and a second audio signal of an original audio signal, where the original audio signal includes a left channel signal and a right channel signal, the first audio signal is a signal of the left channel signal that is the same as the right channel signal, and the second audio signal is a background audio signal; performing frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a frequency-modulated signal; obtaining a mixed audio signal according to the frequency modulation signal and the second audio signal;
an output unit 502 for outputting the mixed audio signal and the original audio signal, respectively.
In an embodiment, before performing frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a frequency-modulated signal, the processing unit 501 is further configured to:
according to the frequency division point, performing frequency division on the first audio signal to obtain a low-frequency signal corresponding to the first audio signal and a high-frequency signal corresponding to the first audio signal;
and the frequency corresponding to the frequency division point is greater than the lower frequency limit of the first audio signal and less than the upper frequency limit of the first audio signal.
In an embodiment, the processing unit 501 is further configured to obtain a mixed audio signal according to the frequency modulation signal and the second audio signal, and specifically configured to:
mixing the frequency modulation signal and the high-frequency signal to obtain an intermediate audio signal;
and mixing the intermediate audio signal and the second audio signal to obtain the mixed audio signal.
In an embodiment, before mixing the frequency modulation signal with the high frequency signal to obtain an intermediate audio signal, the processing unit 501 is further configured to:
calculating the delay of the frequency-modulated signal relative to the low-frequency signal;
time-aligning the high frequency signal with the frequency modulated signal according to the delay;
before the intermediate audio signal is mixed with the second audio signal to obtain the mixed audio signal, the processing unit 501 is further configured to:
time-aligning the intermediate audio signal with the second audio signal according to the delay;
before outputting the mixed audio signal and the original audio signal respectively, the processing unit 501 is further configured to:
time-aligning the mixed audio signal with the original audio signal according to the delay.
In an embodiment, if the upper frequency limit of the first audio signal is lower than a preset frequency threshold, the low-frequency signal corresponding to the first audio signal is the first audio signal.
In an embodiment, the processing unit 501 is further configured to obtain a mixed audio signal according to the frequency modulation signal and the second audio signal, and specifically configured to:
and mixing the frequency modulation signal and the second audio signal to obtain a mixed audio signal.
In an embodiment, the processing unit 501 is further configured to perform frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a frequency-modulated signal, and specifically configured to:
acquiring a first sine signal and a first cosine signal of a low-frequency signal corresponding to the first audio signal through Hilbert transform;
determining a second sine signal and a second cosine signal corresponding to the frequency modulation frequency;
multiplying the first sine signal and the second sine signal to obtain a first product, and multiplying the first cosine signal and the second cosine signal to obtain a second product;
and adding or subtracting the first product and the second product to obtain a frequency modulation signal.
According to an embodiment of the present application, some steps involved in the audio signal processing method shown in fig. 2 or fig. 4 may be performed by each unit in the audio signal processing apparatus shown in fig. 5. For example, steps 201 to 203 shown in fig. 2 may be performed by the processing unit 501 shown in fig. 5, and step 204 may be performed by the output unit 502 shown in fig. 5. Steps 401 to 403 shown in fig. 4 may be performed by the processing unit 501 shown in fig. 5, and step 404 may be performed by the output unit 502 shown in fig. 5. The units in the audio signal processing apparatus shown in fig. 5 may be respectively or entirely combined into one or several other units to form one or several other units, or some unit(s) may be further split into multiple units with smaller functions to form the same operation, without affecting the achievement of the technical effects of the embodiments of the present application. The units are divided based on logic functions, and in practical application, the functions of one unit can be realized by a plurality of units, or the functions of a plurality of units can be realized by one unit. In other embodiments of the present application, the audio signal processing apparatus may also include other units, and in practical applications, these functions may also be implemented by being assisted by other units, and may be implemented by cooperation of a plurality of units.
According to another embodiment of the present application, the audio signal processing apparatus as shown in fig. 5 may be constructed by running a computer program (including program codes) capable of executing the steps involved in the corresponding method as shown in fig. 2 on a general-purpose computing apparatus such as a computer including a Central Processing Unit (CPU), a random access storage medium (RAM), a read only storage medium (ROM), and the like as well as a storage element, and the audio signal processing method of the embodiment of the present application may be implemented. The computer program may be recorded on a computer-readable recording medium, for example, and loaded and executed in the above-described computing apparatus via the computer-readable recording medium.
Based on the same inventive concept, the principle and the advantageous effect of the audio signal processing apparatus provided in the embodiment of the present application for solving the problem are similar to the principle and the advantageous effect of the audio signal processing apparatus in the embodiment of the present application for solving the problem, and for brevity, the principle and the advantageous effect of the implementation of the method may be referred to, and are not described herein again.
Referring to fig. 6, fig. 6 is a schematic structural diagram of an audio signal processing apparatus according to an embodiment of the present disclosure, where the audio signal processing apparatus includes a processor 601, an input/output module 602, and a memory 603. The processor 601, the input/output module 602, and the memory 603 may be connected by a bus or other means, and the embodiment of the present application is exemplified by being connected by a bus. The processor 601 (or Central Processing Unit, CPU) is a computing core and a control core of the terminal, and can analyze various instructions in the terminal and process various data of the terminal, for example: the CPU can be used for analyzing a power-on and power-off instruction sent to the terminal by a user and controlling the terminal to carry out power-on and power-off operation; the following steps are repeated: the CPU may transmit various types of interactive data between the internal structures of the terminal, and so on. The input/output module 602 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI, mobile communication interface, etc.), and may be controlled by the processor 601 to transmit and receive audio signals; the input-output module 602 may also be used for transmission and interaction of audio signals inside the terminal. A Memory 603(Memory) is a Memory device in the terminal for storing programs and data. It is understood that the memory 603 herein may comprise a built-in memory of the terminal, and may also comprise an extended memory supported by the terminal. The memory 603 provides storage space that stores the operating system of the terminal, which may include, but is not limited to: android system, iOS system, Windows Phone system, etc., which are not limited in this application.
In the embodiment of the present application, the processor 601 executes the executable program code in the memory 603 to perform the following operations:
acquiring a first audio signal and a second audio signal of an original audio signal through an input/output module 602, where the original audio signal includes a left channel signal and a right channel signal, the first audio signal is a signal of the left channel signal that is the same as the right channel signal, and the second audio signal is a background audio signal;
performing frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a frequency-modulated signal;
obtaining a mixed audio signal according to the frequency modulation signal and the second audio signal;
the mixed audio signal and the original audio signal are output through the input and output module 602, respectively.
As an optional implementation manner, before performing frequency modulation on the low-frequency signal corresponding to the first audio signal to obtain the frequency-modulated signal, the processor 601 further performs the following operations by executing the executable program code in the memory 603:
according to the frequency division point, performing frequency division on the first audio signal to obtain a low-frequency signal corresponding to the first audio signal and a high-frequency signal corresponding to the first audio signal;
and the frequency corresponding to the frequency division point is greater than the lower frequency limit of the first audio signal and less than the upper frequency limit of the first audio signal.
As an optional implementation manner, the specific implementation manner of obtaining the mixed audio signal by the processor 601 according to the frequency modulation signal and the second audio signal is as follows:
mixing the frequency modulation signal and the high-frequency signal to obtain an intermediate audio signal;
and mixing the intermediate audio signal and the second audio signal to obtain the mixed audio signal.
As an optional implementation manner, before the frequency modulation signal is mixed with the high frequency signal to obtain the intermediate audio signal, the processor 601 further performs the following operations by running the executable program code in the memory 603:
calculating the delay of the frequency-modulated signal relative to the low-frequency signal;
time-aligning the high frequency signal with the frequency modulated signal according to the delay;
before the intermediate audio signal and the second audio signal are mixed to obtain the mixed audio signal, the processor 601 further executes the following operations by running the executable program code in the memory 603:
time-aligning the intermediate audio signal with the second audio signal according to the delay;
before outputting the mixed audio signal and the original audio signal, respectively, the processor 601 further performs the following operations by executing the executable program code in the memory 603:
time-aligning the mixed audio signal with the original audio signal according to the delay.
As an optional implementation manner, if the upper frequency limit of the first audio signal is lower than a preset frequency threshold, the low-frequency signal corresponding to the first audio signal is the first audio signal.
As an optional implementation manner, the specific implementation manner of obtaining the mixed audio signal by the processor 601 according to the frequency modulation signal and the second audio signal is as follows:
and mixing the frequency modulation signal and the second audio signal to obtain a mixed audio signal.
As an optional implementation manner, the processor 601 frequency-modulates the low-frequency signal corresponding to the first audio signal to obtain a frequency-modulated signal, where the specific implementation manner of the frequency-modulated signal is as follows:
acquiring a first sine signal and a first cosine signal of a low-frequency signal corresponding to the first audio signal through Hilbert transform;
determining a second sine signal and a second cosine signal corresponding to the frequency modulation frequency;
multiplying the first sine signal and the second sine signal to obtain a first product, and multiplying the first cosine signal and the second cosine signal to obtain a second product;
and adding or subtracting the first product and the second product to obtain a frequency modulation signal.
Based on the same inventive concept, the principle and the advantageous effect of the audio signal processing apparatus provided in the embodiment of the present application for solving the problem are similar to the principle and the advantageous effect of the audio signal processing apparatus in the embodiment of the present application for solving the problem, and for brevity, the principle and the advantageous effect of the implementation of the method may be referred to, and are not described herein again.
The embodiment of the present application further provides a computer-readable storage medium, where one or more instructions are stored in the computer-readable storage medium, and the one or more instructions are adapted to be loaded by a processor and to execute the node processing method according to the foregoing method embodiment.
Embodiments of the present application further provide a computer program product containing instructions, which when run on a computer, cause the computer to execute the node processing method described in the above method embodiments.
It should be noted that, for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the order of acts described, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
The steps in the method of the embodiment of the application can be sequentially adjusted, combined and deleted according to actual needs.
The modules in the device can be merged, divided and deleted according to actual needs.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, which may include: flash disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A method of audio signal processing, the method comprising:
acquiring a first audio signal and a second audio signal of an original audio signal, wherein the original audio signal comprises a left channel signal and a right channel signal, the first audio signal is a signal of which the left channel signal is the same as the right channel signal, and the second audio signal is a background audio signal;
performing frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a frequency-modulated signal;
obtaining a mixed audio signal according to the frequency modulation signal and the second audio signal;
and respectively outputting the mixed audio signal and the original audio signal.
2. The method according to claim 1, wherein before the frequency modulating the low-frequency signal corresponding to the first audio signal to obtain the frequency-modulated signal, the method further comprises:
according to the frequency division point, performing frequency division on the first audio signal to obtain a low-frequency signal corresponding to the first audio signal and a high-frequency signal corresponding to the first audio signal;
and the frequency corresponding to the frequency division point is greater than the lower frequency limit of the first audio signal and less than the upper frequency limit of the first audio signal.
3. The method of claim 2, wherein obtaining a mixed audio signal according to the frequency modulated signal and the second audio signal comprises:
mixing the frequency modulation signal and the high-frequency signal to obtain an intermediate audio signal;
and mixing the intermediate audio signal and the second audio signal to obtain the mixed audio signal.
4. The method of claim 3, wherein before the mixing the frequency modulated signal with the high frequency signal to obtain an intermediate audio signal, the method further comprises:
calculating the delay of the frequency-modulated signal relative to the low-frequency signal;
time-aligning the high frequency signal with the frequency modulated signal according to the delay;
before the audio mixing the intermediate audio signal and the second audio signal to obtain the audio-mixed audio signal, the method further includes:
time-aligning the intermediate audio signal with the second audio signal according to the delay;
before the separately outputting the mixed audio signal and the original audio signal, the method further includes:
time-aligning the mixed audio signal with the original audio signal according to the delay.
5. The method of claim 1, wherein if the upper frequency limit of the first audio signal is lower than a predetermined frequency threshold, the low frequency signal corresponding to the first audio signal is the first audio signal.
6. The method according to claim 1, wherein the frequency modulating the low-frequency signal corresponding to the first audio signal to obtain a frequency-modulated signal comprises:
acquiring a first sine signal and a first cosine signal of a low-frequency signal corresponding to the first audio signal through Hilbert transform;
determining a second sine signal and a second cosine signal corresponding to the frequency modulation frequency;
multiplying the first sine signal and the second sine signal to obtain a first product, and multiplying the first cosine signal and the second cosine signal to obtain a second product;
and adding or subtracting the first product and the second product to obtain a frequency modulation signal.
7. A method of audio signal processing, the method comprising:
acquiring a first audio signal and a second audio signal of an original audio signal, wherein the original audio signal comprises a left channel signal and a right channel signal, the first audio signal is a signal of which the left channel signal is the same as the right channel signal, and the second audio signal is a background audio signal;
performing frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a first frequency modulation signal and a second frequency modulation signal;
obtaining a first audio-mixing audio signal according to the first frequency modulation signal and the second audio signal, and obtaining a second audio-mixing audio signal according to the second frequency modulation signal and the second audio signal;
and respectively outputting the first mixed audio signal and the second mixed audio signal.
8. An audio signal processing apparatus, comprising:
the processing unit is used for acquiring a first audio signal and a second audio signal of an original audio signal, wherein the original audio signal comprises a left channel signal and a right channel signal, the first audio signal is the same signal as the left channel signal and the right channel signal, and the second audio signal is a background audio signal; performing frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a frequency-modulated signal; obtaining a mixed audio signal according to the frequency modulation signal and the second audio signal;
an output unit for outputting the mixed audio signal and the original audio signal, respectively.
9. An audio signal processing apparatus, comprising:
the processing unit is used for acquiring a first audio signal and a second audio signal of an original audio signal, wherein the original audio signal comprises a left channel signal and a right channel signal, the first audio signal is the same signal as the left channel signal and the right channel signal, and the second audio signal is a background audio signal; performing frequency modulation on a low-frequency signal corresponding to the first audio signal to obtain a first frequency modulation signal and a second frequency modulation signal; obtaining a first audio-mixing audio signal according to the first frequency modulation signal and the second audio signal, and obtaining a second audio-mixing audio signal according to the second frequency modulation signal and the second audio signal;
an output unit for outputting the first mixed audio signal and the second mixed audio signal, respectively.
10. An audio signal processing device is characterized by comprising a processor, a memory and an input and output module; wherein the memory is for storing a computer program comprising program instructions, the input-output module is for transmitting audio signals, and the processor is configured for invoking the program instructions for performing the method of any one of claims 1 to 7.
11. A computer-readable storage medium having stored thereon one or more instructions adapted to be loaded by a processor and to perform the method of any of claims 1 to 7.
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