CN103369429A - Low voice enhancing method and device and voice control device - Google Patents
Low voice enhancing method and device and voice control device Download PDFInfo
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Abstract
The invention discloses a low voice enhancing method and device and a voice control device. The low voice enhancing method comprises the following steps of extracting low voice signals in voice frequency signals; carrying out N times of time compression processing and time domain prolongation processing on the low voice signals to generate M-time harmonic signals of N low voice signals; adjusting the M-time harmonic signals to the preset amplitude according to a gain coefficient corresponding to the M-time harmonic signals; and adding up N M-time harmonic signals which are subjected to amplitude adjustment to obtain a total harmonic signal. According to the low voice enhancing method, the amplitude adjustment is separately carried out on each M-time harmonic signal, so that the defect that the amplitude adjustment is carried out on all the harmonic signals to cause control difficulty in the prior art can be overcome.
Description
Technical Field
The present invention relates to the field of audio processing technologies, and in particular, to a bass enhancement method and apparatus, and a sound control device.
Background
At present, consumer electronic equipment is increasingly miniaturized, particularly, the trend of lightness and thinness is more obvious, and a loudspeaker is required to be smaller and smaller to meet the requirement that the appearance of the electronic equipment is smaller and smaller, however, the smaller the volume of the loudspeaker is, the higher the low-frequency cut-off frequency is, the more difficultly enough bass signals are generated, so that the perception of bass by human ears is lost, and the sound quality is reduced.
The current prior art solution to this problem is to use the psycho-acoustic phenomenon "vanishing fundamental" to enhance bass perception. The principle is as follows: even if the fundamental frequency is not present, the fundamental frequency can be perceived through its harmonics, so this method is also called "virtual bass" or "residual tone".
The prior art discloses a harmonic generation method of virtual bass, which generates all harmonic signals of bass signals by utilizing a shaping integral or a feedback multiplication loop, and has the advantages of simple structure, difficult control of the amplitude of the harmonic signals, generation of higher harmonic signals, and sound distortion caused by the fact that the higher harmonic signals after the fifth harmonic signals change the tone of the user in the sense of hearing.
The prior art also discloses a polynomial-based harmonic generation method. Although this method can arbitrarily control the number and amplitude of the generated harmonic signals, it inevitably generates intermodulation distortion concerning the frequency component distribution of the input signal due to multiplication. Meanwhile, the number of multiplication operations is increased compared with the previous method, and more CPU resources and energy are consumed to complete the operations, which is a fatal disadvantage for consumer electronic devices with limited battery capacity.
Disclosure of Invention
The invention mainly aims to provide a bass enhancement method, a device and a sound control equipment, wherein the amplitude of a harmonic signal is easy to control and no intermodulation distortion is generated.
In order to achieve the above object, the present invention provides a bass enhancing method, comprising the steps of:
extracting a bass signal from the audio signal;
carrying out N times of time compression processing and time domain continuation processing on the bass signals to generate M times of harmonic signals of N bass signals;
adjusting the M-order harmonic signal to a preset amplitude according to a gain coefficient corresponding to the M-order harmonic signal;
adding the N M-order harmonic signals with the adjusted amplitudes to obtain a total harmonic signal;
wherein N and M are integers, and N is greater than 1.
Preferably, the step of performing time compression processing and time domain continuation processing on the bass signal N times to generate an M-th harmonic signal of the bass signal specifically includes:
performing time compression processing on the bass signals for N times to generate N M harmonic signals;
and respectively extending the N M-order harmonic signals into M periods in a time domain to obtain M-order harmonic signals with the same length as the bass signals before compression.
Preferably, the step of performing time compression processing and time domain continuation processing on the bass signal N times to generate an M-th harmonic signal of the bass signal specifically includes:
carrying out time domain continuation processing on the bass signal;
and carrying out N times of time compression processing on the extended bass signals to obtain N M times of harmonic signals with the same length as the bass signals before extension.
Preferably, the M-th harmonic signal corresponds to a gain coefficient gMThe following formula is given:
wherein g is0=1，HMIs the amplitude of each harmonic.
The invention further proposes a bass enhancement device comprising:
a low pass filter for extracting a bass signal from the audio signal;
the harmonic generation module is used for carrying out N times of time compression processing and time domain continuation processing on the bass signals so as to generate M times of harmonic signals of N bass signals;
the amplitude adjusting module is used for adjusting the M-order harmonic signal to a preset amplitude according to a gain coefficient corresponding to the M-order harmonic signal;
the adder is used for adding the N M-order harmonic signals after the amplitude is adjusted to obtain a total harmonic signal;
wherein N and M are positive integers, and N is greater than 1.
Preferably, the harmonic generation module is specifically configured to perform time compression processing on the bass signal for N times to generate N M-th harmonic signals, and then extend the N M-th harmonic signals into M periods in a time domain, respectively, to obtain M-th harmonic signals having a length the same as that of the bass signal before compression.
Preferably, the harmonic generation module is specifically configured to perform time domain continuation processing on the bass signal; and then, carrying out N times of time compression processing on the extended bass signals to obtain N M times of harmonic signals with the same length as the bass signals before extension.
The invention further provides sound control equipment, which comprises a bass enhancement device, a filtering parameter calculator, a man-machine interaction interface and a bass controller, wherein the filtering parameter calculator, the man-machine interaction interface and the bass controller are sequentially connected with the bass enhancement device; wherein,
the bass enhancement apparatus includes:
a low pass filter for extracting a bass signal from the audio signal;
the harmonic generation module is used for performing N times of time compression processing and time domain continuation processing on the bass signals to generate M times of harmonic signals of N bass signals;
the amplitude adjusting module is used for adjusting the M-order harmonic signal to a preset amplitude according to a gain coefficient corresponding to the M-order harmonic signal;
the adder is used for adding the N M-order harmonic signals after the amplitude is adjusted to obtain a total harmonic signal;
the bass controller is used for inputting relevant bass control parameters by a user;
the man-machine interaction interface is used for receiving the bass control parameters and sending the bass control parameters to the filtering parameter calculator;
and the filtering parameter calculator is used for calculating a gain coefficient corresponding to the M-order harmonic signal according to the received bass control parameter.
Preferably, the bass control parameter comprises a low frequency cut-off frequency f of the loudspeakercAnd a higher harmonic attenuation coefficient n, when the gain coefficient corresponding to the M harmonic signal is gMThe audio signal sampling rate is fsWherein f iscN and gMThe following relation is satisfied:
preferably, the bass control parameters include the respective harmonic amplitudes HM，HMGain coefficient g corresponding to the M-th harmonic signalMThe following relation is satisfied:
The bass enhancement method provided by the invention extracts bass signals in the audio signals, then performs N times of time compression processing and time domain continuation processing on the bass signals to generate M times of harmonic signals of N bass signals, then adjusts the M times of harmonic signals to a preset amplitude, and adds the N times of harmonic signals after the amplitude adjustment to obtain a total harmonic signal. The bass enhancement method provided by the invention independently adjusts the amplitude of the M-th harmonic signal, overcomes the defect that the amplitude of all harmonic signals is not easy to control because the amplitude of all harmonic signals is adjusted together in the prior art, and ensures that the amplitude of each harmonic signal is easier to control. In addition, each harmonic signal is processed independently, so that the phenomenon of intermodulation distortion caused by multiplication in the prior art is avoided. The bass enhancement method provided by the invention can meet the sound amplification requirement of the loudspeaker with the increasingly thinner and thinner volume, and is particularly suitable for the thinned electronic equipment.
Drawings
FIG. 1 is a schematic flow diagram of a preferred embodiment of the bass enhancement method of the present invention;
FIG. 2 is a schematic flow chart of the preferred embodiment of the bass enhancement method of the present invention for generating M-th harmonic signals of a bass signal;
FIG. 3 is a schematic flow chart of a preferred embodiment of the bass enhancement method of the present invention for generating an M-th harmonic signal of a bass signal;
FIG. 4 is a typical pattern of a 50Hz single frequency tone spectrum;
FIG. 5 is a typical pattern of a generated harmonic spectrum of a 50Hz single frequency tone using the bass enhancement method of the present invention;
FIG. 6 is a typical pattern of 50Hz and 70Hz composite pitch spectra;
FIG. 7 is a typical pattern of the resulting harmonic spectra of 50Hz and 70Hz composite tones using the bass enhancement method of the present invention;
FIG. 8 is a schematic diagram of the structure of a preferred embodiment of the bass enhancement apparatus of the present invention;
fig. 9 is a schematic structural diagram of a preferred embodiment of the sound control apparatus of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solution of the present invention is further described with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The method comprises the steps of extracting bass signals in audio signals, carrying out N times of time compression processing and time domain continuation processing on the bass signals to generate M times of harmonic signals of N bass signals, adjusting the M times of harmonic signals to a preset amplitude, and adding the N times of harmonic signals after the amplitude is adjusted to obtain a total harmonic signal. The method provided by the invention independently adjusts the amplitude of the M-th harmonic signal, overcomes the defect that the amplitude of all harmonic signals is not easy to control because the amplitude of all harmonic signals is adjusted together in the prior art, and ensures that the amplitude of each harmonic signal is easier to control. In addition, each harmonic signal is processed independently, so that the phenomenon of intermodulation distortion caused by multiplication in the prior art is avoided.
Referring to fig. 1, fig. 1 is a flow chart illustrating a bass enhancing method according to an embodiment of the present invention.
In this embodiment, a bass enhancement method includes:
step S10, extracting bass signals in the audio signals;
specifically, a bass signal in the audio signal of the speaker may be extracted through a low pass filter, and a treble signal in the audio signal may be extracted through a high pass filter. The bass signal is input according to frames, the length L of one frame is between 5ms and 100ms, and the bass signal is determined according to the system delay requirement.
Step S20, performing time compression processing and time domain continuation processing on the bass signals for N times to generate M times of harmonic signals of the N bass signals;
wherein N and M are positive integers, and N is greater than 1. Specifically, the number of times of the time compression processing and the time domain extension processing is determined according to the number of harmonic signals that need to be generated. If 3 harmonic signals including a third harmonic signal, a fourth harmonic signal and a fifth harmonic signal are required to be generated, 3 times of time compression processing and time domain extension processing are required to be carried out on the bass signals. It should be noted that, if the harmonic signal to be generated includes a first harmonic signal, the first harmonic signal obtained by performing the time compression processing and the time domain extension processing on the bass signal is the same as the bass signal.
The present invention specifically proposes two schemes for generating harmonic signals.
Specifically, referring to fig. 2, the first scheme is: step S20 includes the following steps:
step S21, performing N-time compression processing on the bass signal to generate N M-order harmonic signals;
in this example, M =1, 2, 3, 4 or 5. That is, 5 harmonic signals are generated, i.e., a first harmonic signal to a fifth harmonic signal.
And step S22, respectively extending the N M-order harmonic signals into M periods in the time domain to obtain M-order harmonic signals with the same length as the bass signals before compression.
The extended period number corresponds to M of the M-th harmonic signal, for example, the second harmonic signal needs to be extended to 2 periods in the time domain, and the third harmonic signal needs to be extended to 3 periods in the time domain. -
Specifically, referring to fig. 3, the second scheme is: step S20 includes the following steps:
step S23, performing time domain continuation processing on the bass signal;
and step S24, performing time compression processing on the extended bass signal for N times to obtain N M harmonic signals with the same length as the bass signal before extension.
The number of cycles of the extended bass signal in the time domain is the same as the highest harmonic signal of the M harmonic signals required to be obtained. That is, if a plurality of harmonic signals are generated and the highest harmonic signal is a fifth harmonic signal, the bass signal is first extended to 5 periods in the time domain.
The second scheme puts continuation processing before time compression, so that when L/M is not an integer, further processing is not needed to ensure continuation processing
Wherein
Indicating a rounding operation.
Step S30, adjusting the M-order harmonic signal to a preset amplitude according to the gain coefficient corresponding to the M-order harmonic signal;
the invention provides two methods for obtaining a gain coefficient g according to a bass control parameterMThe method of (3).
The first method for calculating the gain factor of the M-th harmonic signal is as follows.
The bass control parameters specifically include: low frequency cut-off frequency f of loudspeakercWith higher harmonic attenuation coefficient n, in particular, bass control parameter fcAnd n may be manually entered by the user.
When M harmonic signal corresponds to gainCoefficient of gMThe audio signal sampling rate is fsWhen f is presentcN and gMThe following relation is satisfied:
Firstly, M =2, g1Substitution of =1 into the formula
The gain coefficient g corresponding to the second harmonic signal can be calculated2At this time g1=1 represents that the amplitude of the first harmonic signal with respect to the bass signal remains unchanged.
Then, n and g2It is known to substitute M =3 into the formulaGain coefficient g corresponding to the third harmonic signal is obtained3And analogizing in turn to obtain the gain coefficient g corresponding to the fourth harmonic signal4Gain coefficient g corresponding to fifth harmonic signal5。
In this embodiment, the speaker can be usedLow cut-off frequency fcButterworth filters are used to design specific parameters for the high pass and low pass filters, of the IIR (Infinite Impulse Response) type.
The second method for calculating the gain factor of the M-th harmonic signal is specifically as follows.
The bass control parameters include the amplitude H of each harmonicM，HMThe setting may be manually entered by the user. At this time, HMGain factor g corresponding to M-th harmonic signalMThe following relation is satisfied:
g0=1 represents the amplitude of the bass signal. In the above formula, M =1, 2, 3, 4 or 5, and M =1, 2, 3, 4 or 5 is substituted intoThereby respectively obtaining gain coefficients g corresponding to M harmonic signals1，g2，g3，g4And g5。
The second method of calculating the gain factor has a more flexible function of adjusting the amplitude of the harmonic wave than the first method of calculating the gain factor.
And step S40, adding the N M-order harmonic signals after the amplitude adjustment to obtain a total harmonic signal.
Specifically, taking M as 1 to 5 as an example, a total harmonic signal is obtained by adding the first harmonic signal to the fifth harmonic signal, the total harmonic signal is obtained by adding the five harmonic signals, and then, the user perceives the bass signal according to the total harmonic signal.
Specifically, referring to fig. 4 and 5, when a 50Hz single-frequency bass signal is input by using the bass enhancement method of the present invention, it can be seen with reference to the typical pattern of the harmonic signal generated in fig. 5 that the frequencies of the generated integer-order harmonic signal are 100 Hz, 150Hz, 200 Hz, and 250 Hz, respectively, and the corresponding gain coefficient g is then obtained1，g2，g3，g4And g51, 1/32, 1/256, 1/1024, 1/2048, respectively.
Specifically, referring to fig. 6 and 7, when the bass enhancement method of the present invention is applied when 50Hz and 70Hz composite bass signal inputs are input, referring to fig. 7, the frequencies at which the integer-order harmonic signals are generated are 100 Hz, 150Hz, 200 Hz, 250 Hz and 140 Hz, 210Hz, 280Hz, 350 Hz. The gain factor g corresponding to this time1，g2，g3，g4And g51, 1/32, 1/256, 1/1024, 1/2048, respectively. And it can be seen from the typical pattern of the harmonic signal that the harmonic signal generated by the bass enhancement method of the present invention does not generate the phenomenon of intermodulation distortion.
This embodiment mainly describes a method of enhancing a bass signal in a speaker. It should be noted that, in the specific implementation, a high pass filter and a low pass filter may be arranged to extract a high pitch signal and a low pitch signal from the audio signals of the left and right channels of the speaker, then the low pitch signal is processed according to the bass enhancement method proposed by the present invention to generate an M-th harmonic signal of the low pitch signal, and finally the high pitch signal and the M-th harmonic signal of the left and right channels are added to be the final output signals of the left and right channels. In addition, the present invention preferably generates the first fifth harmonic signal, and the higher harmonic signal following the fifth harmonic signal changes the sound color in the sense of hearing of the user, thereby causing sound distortion.
The bass enhancement method provided by the invention extracts bass signals in the audio signals, then performs N times of time compression processing and time domain continuation processing on the bass signals to generate M times of harmonic signals of N bass signals, then adjusts the M times of harmonic signals to a preset amplitude, and adds the N times of harmonic signals after the amplitude adjustment to obtain a total harmonic signal. The bass enhancement method provided by the invention independently adjusts the amplitude of each harmonic signal, overcomes the defect that the amplitude of all harmonic signals is not easy to control because the amplitude of all the harmonic signals is adjusted together in the prior art, and ensures that the amplitude of each harmonic signal is easier to control. In addition, each harmonic signal is processed independently, so that the phenomenon of intermodulation distortion caused by multiplication in the prior art is avoided. If the bass enhancement method provided by the invention is applied, the requirement of sound amplification of a loudspeaker with the thinner and thinner volume can be met, and the bass enhancement method is particularly suitable for the thinner and thinner electronic equipment.
The invention further proposes a bass enhancement device.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a preferred embodiment of the bass enhancing apparatus of the present invention.
In the present preferred embodiment, the bass boost device includes:
a low pass filter 10 for extracting a bass signal from the audio signal;
the bass signal is input according to frames, the length L of one frame is between 5ms and 100ms, and the bass signal is determined according to the system delay requirement.
A harmonic generation module 20, configured to perform time compression processing and time domain continuation processing on the bass signals N times to generate M-th harmonic signals of the N bass signals;
wherein, N and M are positive integers, N is more than 1, and M represents that the bass signal is generated into a positive integer subharmonic signal.
The harmonic generation module 20 can be embodied by the following two schemes.
The first scheme is as follows: the harmonic generation module 20 is specifically configured to perform time compression on the bass signal N times to generate N M-order harmonic signals, and then extend the N M-order harmonic signals into M periods in the time domain, respectively, to obtain M-order harmonic signals having the same length as the bass signal before compression.
The second scheme is as follows: the harmonic generation module 20 is specifically configured to perform continuation processing on the bass signal in the time domain; and then, carrying out N times of time compression on the extended bass signal to obtain N M times of harmonic signals with the same length as the bass signal before extension.
The second scheme puts continuation processing before time compression, so that when L/M is not an integer, further processing is not needed to ensure continuation
Wherein
Indicating a rounding operation.
The amplitude adjusting module 30 is configured to adjust the M-th harmonic signal to a preset amplitude according to a gain coefficient corresponding to the M-th harmonic signal;
each harmonic signal corresponds to a gain coefficient, and all the M-order harmonic signals are adjusted to preset amplitudes according to the corresponding gain coefficients.
And the adder 40 is used for adding all the M-th harmonic signals after amplitude adjustment to obtain a total harmonic signal.
Specifically, taking M as 1 to 5 as an example, a total harmonic signal is obtained by adding the first harmonic signal to the fifth harmonic signal, the total harmonic signal is obtained by adding the five harmonic signals, and then, the user perceives the bass signal according to the total harmonic signal.
According to the bass enhancement device provided by the invention, a bass signal in an audio signal is extracted through a low-pass filter 10, then a harmonic generation module 20 performs N times of time compression processing and time domain extension processing on the bass signal to generate M times of harmonic signals of N bass signals, the M times of harmonic signals are adjusted to a preset amplitude through an amplitude adjustment module 30, and the N M times of harmonic signals after the amplitude is adjusted by an adder 40 are added to obtain a total harmonic signal. The bass enhancement device provided by the invention independently adjusts the amplitude of the M-th harmonic signal, overcomes the defect that the amplitude of all harmonic signals is not easy to control because the amplitude of all harmonic signals is adjusted together in the prior art, enables the amplitude of each harmonic signal to be easier to control, and simultaneously can generate the M-th harmonic signal of the bass signal only by time compression processing and time domain continuation processing, so the power consumption of the bass enhancement device is smaller because the operand is small. In addition, each harmonic signal is processed independently, so that the phenomenon of intermodulation distortion caused by multiplication in the prior art is avoided. If the bass enhancement device provided by the invention is applied, the requirement of amplifying the sound of the loudspeaker with the thinner and thinner volume can be met, and the bass enhancement device is particularly suitable for being installed on the thinner and thinner electronic equipment.
The invention further provides sound control equipment.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a preferred embodiment of the sound control apparatus of the present invention.
In this embodiment, the sound control apparatus includes a bass enhancing device 50, and further includes a filter parameter calculator 60, a human-computer interface 70, and a bass controller 80 sequentially connected to the bass enhancing device 50; the specific structure of the bass enhancing apparatus refers to the above embodiments, and is not described herein again.
A bass controller 80 for user input of relevant bass control parameters;
a human-computer interaction interface 70 for receiving the bass control parameters and sending the bass control parameters to the filter parameter calculator;
and a filter parameter calculator 60 for calculating a gain coefficient according to the received bass control parameter.
Specifically, the user may input the relevant bass control parameters through the bass controller 80, and then send the bass control parameters to the filter parameter calculator 60 through the human-computer interface 70, where a program for calculating gain coefficients is provided in the filter parameter calculator 60, and the gain coefficients corresponding to the M-th harmonic signals may be calculated according to the bass control parameters.
Specifically, the present invention proposes two calculation methods of the filter parameter calculator 60.
The first calculation method is as follows: the bass control parameters include the low frequency cut-off frequency f of the loudspeakercAnd a higher harmonic attenuation coefficient n, when the gain coefficient corresponding to the M harmonic signal is gMThe audio signal sampling rate is fsWherein f iscN and gMThe following relation is satisfied:
Firstly, M =2, g1Substitution of =1 into the formula
Can calculate the second harmonicGain factor g of signal2At this time g1=1 represents that the amplitude of the first harmonic signal with respect to the bass signal remains unchanged.
Then, n and g2It is known to substitute M =3 into the formula
Gain coefficient g corresponding to the third harmonic signal is obtained3And analogizing in turn to obtain the gain coefficient g corresponding to the fourth harmonic signal4Gain coefficient g corresponding to fifth harmonic signal5。
The invention can be based on the low-frequency cut-off frequency f of the loudspeakercThe butterworth filter is used to design specific parameters of the high pass filter and the low pass filter, and the high pass filter and the low pass filter may be of the IIR (Infinite Impulse Response, digital filter) type.
The second calculation method is as follows: the bass control parameters include the low frequency cut-off frequency f of the loudspeakercAnd amplitude of each harmonic HMWhen the gain coefficient corresponding to the M-th harmonic signal is gMIn which H isMAnd gMThe following relation is satisfied:
g0=1 represents the amplitude of the bass signal. In the above formula, M =1, 2, 3, 4 or 5, and M =1, 2, 3, 4 or 5 is substituted into
Thereby respectively obtaining gain coefficients g corresponding to M harmonic signals1，g2，g3，g4And g5。
The filtering parameter calculator has a more flexible harmonic amplitude adjustment function compared with the first calculation method by adopting the second calculation method.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A bass enhancement method, comprising the steps of:
extracting a bass signal from the audio signal;
carrying out N times of time compression processing and time domain continuation processing on the bass signals to generate M times of harmonic signals of N bass signals;
adjusting the M-order harmonic signal to a preset amplitude according to a gain coefficient corresponding to the M-order harmonic signal;
adding the N M-order harmonic signals with the adjusted amplitudes to obtain a total harmonic signal;
wherein N and M are positive integers, and N is greater than 1.
2. The bass enhancement method of claim 1, wherein the step of subjecting the bass signal to a time compression process and a time domain prolongation process N times to generate an M-th harmonic signal of the bass signal specifically comprises:
performing time compression processing on the bass signals for N times to generate N M harmonic signals;
and respectively extending the N M-order harmonic signals into M periods in a time domain to obtain M-order harmonic signals with the same length as the bass signals before compression.
3. The bass enhancement method of claim 1, wherein the step of subjecting the bass signal to a time compression process and a time domain prolongation process N times to generate an M-th harmonic signal of the bass signal specifically comprises:
carrying out time domain continuation processing on the bass signal;
and carrying out N times of time compression processing on the extended bass signals to obtain N M times of harmonic signals with the same length as the bass signals before extension.
4. The bass enhancement method of any of claims 1-3, wherein the M-th harmonic signal corresponds to a gain factor gMThe following formula is given:
5. A bass enhancement apparatus, comprising:
a low pass filter for extracting a bass signal from the audio signal;
the harmonic generation module is used for performing N times of time compression processing and time domain continuation processing on the bass signals to generate M times of harmonic signals of N bass signals;
the amplitude adjusting module is used for adjusting the M-order harmonic signal to a preset amplitude according to a gain coefficient corresponding to the M-order harmonic signal;
the adder is used for adding the N M-order harmonic signals after the amplitude is adjusted to obtain a total harmonic signal;
wherein N and M are positive integers, and N is greater than 1.
6. The bass enhancement apparatus of claim 5, wherein the harmonic generation module is specifically configured to perform N times of time compression processing on the bass signal to generate N M times of harmonic signals, and then temporally extend the N M times of harmonic signals into M periods respectively to obtain M times of harmonic signals with the same length as the bass signal before compression.
7. The bass enhancement apparatus of claim 5, in which the harmonic generation module is specifically configured to perform time domain prolongation processing on the bass signal; and then, carrying out N times of time compression processing on the extended bass signals to obtain N M times of harmonic signals with the same length as the bass signals before extension.
8. A sound control apparatus comprising the bass enhancement apparatus as claimed in any one of claims 5 to 8, further comprising a filter parameter calculator, a man-machine interaction interface and a bass controller connected in series with the bass enhancement apparatus; wherein,
the bass controller is used for inputting relevant bass control parameters by a user;
the man-machine interaction interface is used for receiving the bass control parameters and sending the bass control parameters to the filtering parameter calculator;
and the filtering parameter calculator is used for calculating a gain coefficient corresponding to the M-order harmonic signal according to the received bass control parameter.
9. The sound control device of claim 8, where the bass control parameter comprises a low frequency cut-off frequency f of a speakercAnd a higher harmonic attenuation coefficient n, when the gain coefficient corresponding to the M harmonic signal is gMThe audio signal sampling rate is fsWherein f iscN and gMThe following relation is satisfied:
10. the sound control device of claim 8 wherein the bass control parameters include a harmonic amplitude HM，HMGain coefficient g corresponding to the M-th harmonic signalMThe following relation is satisfied:
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| CN110021304A (en) * | 2019-05-10 | 2019-07-16 | 腾讯音乐娱乐科技（深圳）有限公司 | A kind of audio-frequency processing method, device, terminal and storage medium |
| CN110267163A (en) * | 2019-06-18 | 2019-09-20 | 重庆清文科技有限公司 | A kind of virtual low frequency Enhancement Method of direct sound, system, medium and equipment |
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