CN116072133A - Bass enhancement method, device and audio output equipment - Google Patents
Bass enhancement method, device and audio output equipment Download PDFInfo
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- CN116072133A CN116072133A CN202111274633.8A CN202111274633A CN116072133A CN 116072133 A CN116072133 A CN 116072133A CN 202111274633 A CN202111274633 A CN 202111274633A CN 116072133 A CN116072133 A CN 116072133A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/003—Changing voice quality, e.g. pitch or formants
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K15/00—Acoustics not otherwise provided for
- G10K15/02—Synthesis of acoustic waves
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0208—Noise filtering
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
- G10L21/0364—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude for improving intelligibility
Abstract
The invention provides a bass enhancing method, a bass enhancing device and audio output equipment, which are characterized in that firstly, audio data to be processed is processed to obtain a high-pass filtering signal, then the audio data to be processed is processed to obtain a band-pass filtering signal, and then virtual bass corresponding to the band-pass filtering signal is generated according to the amplitude of the fundamental frequency point of the band-pass filtering signal, so that corresponding virtual bass is generated for the fundamental frequency points with different amplitudes, the low-frequency hearing in the audio data received by a user is better, the impact force is more sufficient, the dynamics is better, and the audio quality of audio information output by the audio equipment is improved.
Description
Technical Field
The invention relates to the technical field of sound processing, in particular to a bass enhancement method, a bass enhancement device and audio output equipment.
Background
In miniaturized and portable electronic products, such as headphones, the size of the speakers of these electronic products is often severely limited, and too small a speaker can result in poor reproduction capability at low frequencies, resulting in poor hearing at low frequencies, which is mainly manifested by insufficient strength of the instrument, and poor fullness and turbidity of the sound. But the low frequency component of music plays an important role in hearing, directly affecting the strength, fullness, sense of hunger and impact sense of sound.
According to the principle of "missing fundamental frequency" in psychoacoustics, the virtual hearing of fundamental frequency can be reproduced by using harmonic combination. Therefore, the harmonic wave of the low frequency which can not be reproduced by the loudspeaker can be generated, so that the hearing of the low frequency which can not be reproduced is replaced, and the thickness, the plumpness, the impact force and the like of the sound are improved. Based on this principle, the low frequency performance of small speakers is currently improved mainly by virtual bass algorithms. However, the existing virtual bass algorithm generates harmonics in a relatively fixed mode and the proportion among the harmonics is fixed, so that universality is poor, and meanwhile, the problems of insufficient low-frequency sound effect improvement, insufficient dynamic performance, insufficient impact force and the like exist. For example, there is a patent CN105516860a, which first calculates mel-frequency cepstrum coefficients of a signal, classifies audio signals into three types according to the size of the coefficients, and uses different virtual bass generation methods for different types. The method has the advantages of complex calculation process and large calculation amount.
Disclosure of Invention
In view of this, the embodiments of the present invention provide a bass enhancement method, a bass enhancement device and an audio output apparatus to provide an audio signal modulation scheme for an audio signal with high quality.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a bass enhancement method, comprising:
acquiring audio data to be processed;
processing the audio data to be processed to obtain a high-pass filtering signal;
processing the audio data to be processed to obtain a band-pass filtering signal;
generating virtual bass corresponding to the band-pass filtering signal according to the amplitude of the fundamental frequency point of the band-pass filtering signal;
filtering the virtual bass to obtain a target frequency band signal;
and mixing the high-pass filtered signal with the target frequency band signal and outputting the mixed signal.
Optionally, in the above bass enhancement method, generating a virtual bass corresponding to the band-pass filtered signal includes:
framing the band-pass filtered signal;
detecting the amplitude of a fundamental frequency point of the band-pass filtering signal after framing treatment;
and generating virtual bass by adopting a virtual bass generating function which is matched with the amplitude of the fundamental frequency point.
Optionally, in the bass enhancement method, detecting the amplitude of the baseband frequency point of the band-pass filtered signal after framing includes:
detecting the fundamental frequency point of the band-pass filtering signal after framing treatment by adopting a zero-crossing rate method, an autocorrelation function method or a cepstrum method, and obtaining the amplitude of the fundamental frequency point.
Optionally, in the bass enhancement method, the framing processing is performed on the band-pass filtered signal, including:
and framing the band-pass filtered signals by taking continuous N band-pass filtered signals as one frame, wherein N is a positive integer greater than 1.
Optionally, in the above bass enhancement method, generating the virtual bass by using a virtual bass generating function adapted to the amplitude of the baseband frequency point includes:
and acquiring the amplitude of the fundamental frequency point, determining an amplitude interval to which the amplitude of the fundamental frequency point belongs, and generating virtual bass by adopting a virtual bass generating function corresponding to the amplitude interval.
Optionally, in the above bass enhancement method, determining an amplitude interval to which the amplitude of the fundamental frequency point belongs, and generating the virtual bass by using a virtual bass generating function corresponding to the amplitude interval includes:
when the amplitude of the fundamental frequency point is within the range of 0-0.4V, generating virtual bass by adopting a first virtual bass generating function;
when the amplitude of the fundamental frequency point is within the range of 0.4V-0.55V, generating virtual bass by adopting a second virtual bass generating function;
when the amplitude of the fundamental frequency point is within the range of 0.55V-0.7V, generating virtual bass by adopting a second virtual bass generating function;
and when the amplitude of the fundamental frequency point is within the range of 0.7V-1V interval, generating virtual bass by adopting a second virtual bass generating function.
A bass boost chip comprising a memory and a processor;
the memory is used for storing programs;
the processor configured to execute the program to implement the bass enhancement method of any one of claims 1-6.
A bass enhancement apparatus comprising:
the high-pass filter is used for processing the audio data to be processed to obtain a high-pass filtering signal;
the first band-pass filter is used for processing the audio data to be processed to obtain band-pass filtering signals;
the virtual bass generation module is used for generating virtual bass corresponding to the band-pass filtering signal according to the amplitude of the fundamental frequency point of the band-pass filtering signal;
the second band-pass filter is used for filtering the virtual bass to obtain a target frequency band signal;
and the mixer is used for mixing and outputting the high-pass filtering signal and the target frequency band signal.
Optionally, in the above bass enhancement apparatus, the virtual bass generating module specifically includes:
the framing circuit is used for framing the band-pass filtering signal;
the fundamental frequency detection circuit is used for detecting fundamental frequency points of the band-pass filtered signals after framing treatment;
the amplitude detection module is used for detecting the amplitude of the fundamental frequency point;
and the virtual bass generating circuit is used for generating virtual bass by adopting a virtual bass generating function which is matched with the amplitude of the fundamental frequency point.
An audio output device employing a bass enhancement apparatus as claimed in any one of the preceding claims.
Optionally, the audio output device is a headset or a mobile phone.
Based on the above technical scheme, in the scheme provided by the embodiment of the invention, firstly, the audio data to be processed is processed to obtain the high-pass filtering signal, then the audio data to be processed is processed to obtain the band-pass filtering signal, and then the virtual bass corresponding to the band-pass filtering signal is generated according to the amplitude of the fundamental frequency point of the band-pass filtering signal, so that the corresponding virtual bass is generated for the fundamental frequency points with different amplitudes, thereby the low-frequency hearing in the audio data received by the user is better, the impact force is more sufficient, the dynamics is better, and the audio quality of the audio information output by the audio equipment is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a bass enhancement method disclosed in an embodiment of the present application;
FIG. 2 is a flow chart of a bass enhancement method disclosed in another embodiment of the present application;
FIG. 3 is a flow chart of a bass enhancement method disclosed in another embodiment of the present application;
FIG. 4 is a flow chart of a bass enhancement method disclosed in another embodiment of the present application;
fig. 5 is a schematic structural diagram of a bass enhancement chip disclosed in an embodiment of the present application;
fig. 6 is a schematic structural diagram of a bass enhancement apparatus according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to improve the texture of an audio signal output by an audio device, referring to fig. 1, an embodiment of the present application discloses a bass enhancement method, which includes:
step S101: and acquiring audio data to be processed.
The audio data to be processed is audio data which is not processed by an audio processing device to which the bass enhancement method of the embodiment of the present application is applied.
Step S102: and processing the audio data to be processed to obtain a high-pass filtering signal.
In the scheme, the audio data to be processed is divided into two links for processing, wherein one link is used as a main link; and in the main link, a high-pass Filter (HP Filter) is adopted to carry out high-pass filtering on the audio data to be processed, so as to obtain a high-pass filtering signal.
Step S103: and processing the audio data to be processed to obtain a band-pass filtering signal.
And taking the second link as an auxiliary circuit, wherein the auxiliary circuit is used for generating low-frequency virtual audio, and in the auxiliary circuit, the first band-pass filter is firstly adopted for processing the far-vision audio data to obtain a band-pass filtering signal for generating a virtual bass frequency band.
Step S104: generating virtual bass corresponding to the band-pass filtering signal according to the amplitude of the fundamental frequency point of the band-pass filtering signal;
in this step, after the band-pass filtered signal is obtained, the amplitude of the fundamental frequency point of the band-pass filtered signal needs to be identified, and then a virtual bass corresponding to the band-pass filtered signal is generated based on the amplitude of the fundamental frequency point.
Specifically, referring to fig. 2, this step may specifically include:
step S1041: and framing the band-pass filtered signal.
In this step, the band-pass filtered signals are subjected to framing, and in the framing process, how many band-pass filtered signals are specifically divided into 1 frame can be set by the user based on the user's needs, and the data size is not limited.
That is, the present step may specifically be:
and framing the band-pass filtered signals by taking continuous N band-pass filtered signals as one frame, wherein N is a positive integer not less than 1.
Step S1042: and detecting the amplitude of the fundamental frequency point of the band-pass filtered signal after framing.
After framing the band-pass filtering signal, detecting a framing result by adopting a fundamental frequency detection module, detecting a fundamental frequency point of each frame obtained by framing, and detecting the amplitude of the fundamental frequency point by an amplitude detection module.
Step S1043: and generating virtual bass by adopting a virtual bass generating function which is matched with the amplitude of the fundamental frequency point.
In this step, after the amplitude value of each base frequency point is obtained by calculation, a virtual bass generating function is selected according to the detected amplitude value of the base frequency point by a virtual bass generating function automatic selecting module to generate a virtual bass frequency band signal, and the signal is recorded as virtual bass, wherein each virtual bass corresponds to one frame after framing, namely, each frame after framing corresponds to one virtual bass.
Step S105: and filtering the virtual bass to obtain a target frequency band signal.
In this step, after the virtual bass is obtained, the virtual bass is bandpass filtered by a second bandpass filter to obtain a frequency band required in the virtual component, and the frequency band is used as a target frequency band signal, so that the second link processing is completed.
Step S106: and mixing the high-pass filtered signal with the target frequency band signal and outputting the mixed signal.
In this step, after the high-pass filtered signal output by the first link and the target frequency band signal output by the second link are obtained, the high-pass filtered signal and the target frequency band signal are mixed and output, and the output audio signal is the audio signal that can be heard by the user.
In the audio processing method disclosed in the above embodiment of the present application, first, the audio data to be processed is processed to obtain a high-pass filtered signal, then the audio data to be processed is processed to obtain a band-pass filtered signal, and then a virtual bass corresponding to the band-pass filtered signal is generated according to the amplitude of the fundamental frequency point of the band-pass filtered signal, so that corresponding virtual bass is generated for the fundamental frequency points with different amplitudes, thereby making the low-frequency hearing sense in the audio data received by the user better, the impact force is more sufficient, the dynamics is better, and the audio quality of the audio information output by the audio device is improved.
In the technical solution disclosed in the embodiments of the present application, when detecting the baseband frequency point of the band-pass filtered signal after framing, any detection scheme of the baseband frequency point in the prior art may be used to detect the baseband frequency point of the band-pass filtered signal after framing, and specifically, what type of detection method is adopted may be set by the user based on the user's needs, for example, in the technical solution disclosed in the embodiments of the present application, a zero-crossing rate method, an autocorrelation function method, or a cepstrum method may be used to detect the baseband frequency point of the band-pass filtered signal after framing. The applicant finds that if the zero-crossing rate method is adopted to calculate the fundamental frequency point of the band-pass filtering signal, the zero-crossing rate method is easily affected by the burr signal near the zero-crossing line, so that the calculation result has larger error. If the autocorrelation function method is adopted to calculate the fundamental frequency point of the band-pass filtered signal, the autocorrelation function method calculates the similarity degree between the signal delay and the original signal, the method is easy to realize, the calculated amount is small, but the time division problem can occur when two groups of peaks are very close. Therefore, the technical scheme disclosed by the embodiment can adopt a cepstrum method with higher precision and better stability, namely, the cepstrum method is preferably adopted to calculate the fundamental frequency point of the band-pass filtering signal, when the cepstrum method is adopted to calculate the fundamental frequency point of the band-pass filtering signal, the cepstrum of the band-pass filtering signal is obtained by taking the logarithm of the short-time spectrum of the band-pass filtering signal and then performing IDFT, and the periodic excitation of the voiced sound signal is reflected on the cepstrum to be impulse with the same period, so that the fundamental frequency period of the band-pass filtering signal can be estimated from the cepstrum waveform. The second impulse obtained in the obtained cepstrum waveform is generally regarded as the fundamental frequency point corresponding to the band-pass filtering signal.
In another embodiment of the present application, a plurality of different virtual bass generating functions may be pre-established, where each virtual bass generating function is used for corresponding to a specific amplitude interval and is used for generating a virtual bass corresponding to an amplitude in the specific amplitude interval, that is, referring to fig. 3, in the above method, the virtual bass generating function adapted to the amplitude of the fundamental frequency point is used to generate a virtual bass, which includes:
step S201: acquiring the amplitude of the fundamental frequency point, and determining an amplitude interval to which the amplitude of the fundamental frequency point belongs;
step S202: obtaining a virtual bass generating function corresponding to the amplitude interval;
step S203: and generating virtual bass by adopting a virtual bass generating function corresponding to the amplitude range.
For example, in the technical solution disclosed in the embodiments of the present application, the amplitude of the baseband frequency point may be divided into 4 amplitude intervals, the range of the first amplitude interval may be 0-0.4V, the range of the second amplitude interval may be 0.4V-0.55V, the range of the third amplitude interval may be 0.55V-0.7V, the range of the fourth amplitude interval may be 0.7V-1V, the first amplitude interval corresponds to a first virtual bass generating function, the second amplitude interval corresponds to a second virtual bass generating function, the third amplitude interval corresponds to a third virtual bass generating function, the fourth amplitude interval corresponds to a fourth virtual bass generating function, and the first virtual bass generating function, the second virtual bass generating function, the third virtual bass generating function and the fourth virtual bass generating function are respectively used for generating corresponding virtual bass based on the amplitude of the baseband frequency point.
That is, referring to fig. 4, in the above scheme, determining an amplitude interval to which the amplitude of the fundamental frequency point belongs, and generating a virtual bass using a virtual bass generating function corresponding to the amplitude interval includes:
when the amplitude of the fundamental frequency point is within the range of 0-0.4V, a first virtual bass generating function is obtained, and virtual bass is generated by adopting the first virtual bass generating function;
when the amplitude of the fundamental frequency point is within the range of 0.4V-0.55V, a second virtual bass generating function is obtained, and virtual bass is generated by adopting the second virtual bass generating function;
when the amplitude of the fundamental frequency point is within the range of 0.55V-0.7V, a third virtual bass generating function is obtained, and a second virtual bass generating function is adopted to generate virtual bass;
and when the amplitude of the fundamental frequency point is within the range of 0.7V-1V interval, acquiring a fourth virtual bass generating function, and generating virtual bass by adopting the second virtual bass generating function.
In this embodiment, a mode of constructing the first virtual bass generating function, the second virtual bass generating function, the third virtual bass generating function and the fourth virtual bass mode is specifically disclosed, for example, in the technical solution disclosed in the embodiment of the present application, when the virtual bass is generated by using the first virtual bass generating function, y=1.6|x| -1.6|x|e corresponding to the amplitude of the baseband frequency point is specifically generated by a formula -|x| Virtual bass, when virtual bass is generated using the second virtual bass generating function, y=2.2 (e x -1)/(e x +1) virtual bass, when virtual bass is generated using the third virtual bass generating function, y= 2*e corresponding to the amplitude of the fundamental frequency point is specifically generated by the formula x -sinx virtual bass, in particular formulated with the base when generating virtual bass using a fourth virtual bass generating functionY= |x| (1-e -|x| ) And the virtual bass, wherein in the formula, x is the amplitude of the fundamental frequency point, and y is the amplitude of the virtual bass.
Corresponding to the above method, a bass enhancement chip is disclosed in this embodiment, and referring to fig. 5, the bass enhancement chip disclosed in this embodiment of the present application may include: at least one processor 100, at least one communication interface 200, at least one memory 300, and at least one communication bus 400;
in the embodiment of the present invention, the number of the processor 100, the communication interface 200, the memory 300 and the communication bus 400 is at least one, and the processor 100, the communication interface 200 and the memory 300 complete the communication with each other through the communication bus 400; it will be apparent that the communication connection schematic shown in the processor 100, the communication interface 200, the memory 300 and the communication bus 400 shown in fig. 5 is only optional;
alternatively, the communication interface 200 may be an interface of a communication module, such as an interface of a GSM module;
the processor 100 may be a central processing unit CPU, or a specific integrated circuit ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of the present invention.
The processor 100 is specifically configured to:
acquiring audio data to be processed;
processing the audio data to be processed to obtain a high-pass filtering signal;
processing the audio data to be processed to obtain a band-pass filtering signal;
generating virtual bass corresponding to the band-pass filtering signal according to the amplitude of the fundamental frequency point of the band-pass filtering signal;
the virtual bass generating function filters the virtual bass to obtain a target frequency band signal;
and mixing the high-pass filtered signal with the target frequency band signal and outputting the mixed signal.
The processor is further configured to perform other specific steps of the bass boost method disclosed in the foregoing embodiments of the present application, which are not further described herein.
Corresponding to the above method, this embodiment discloses a bass enhancement device, and specific working contents of each unit are referred to the content of the above method embodiment.
The bass enhancing apparatus provided by the embodiment of the present invention will be described below, and the bass enhancing apparatus described below and the bass enhancing method described above may be referred to correspondingly to each other.
Referring to fig. 6, a bass enhancement apparatus disclosed in an embodiment of the present application may include:
the high-pass filter A corresponds to the step S102 in the method and is used for processing the audio data to be processed by adopting the high-pass filter to obtain a high-pass filtering signal;
the first band-pass filter B corresponds to the step S103 in the method and is used for processing the audio data to be processed to obtain a band-pass filtering signal;
a virtual bass generating module C, corresponding to step S104 in the above method, configured to generate a virtual bass corresponding to the bandpass filtered signal according to the amplitude of the fundamental frequency point of the bandpass filtered signal;
a second band-pass filter D, corresponding to step S105 in the above method, for filtering the virtual bass to obtain a target frequency band signal;
and a mixer E, corresponding to step S106 in the above method, for mixing and outputting the high-pass filtered signal and the target frequency band signal.
Corresponding to the above method, the virtual bass generating module C may specifically include:
the framing circuit is used for framing the band-pass filtering signal;
the fundamental frequency detection circuit is used for detecting fundamental frequency points of the band-pass filtered signals after framing treatment;
the amplitude detection module is used for detecting the amplitude of the fundamental frequency point;
and the virtual bass generating circuit is used for generating virtual bass by adopting a virtual bass generating function which is matched with the amplitude of the fundamental frequency point.
Corresponding to the above method embodiment, the baseband detection circuit is specifically configured to:
and detecting the fundamental frequency point of the band-pass filtering signal after framing treatment by adopting a zero-crossing rate method, an autocorrelation function method or a cepstrum method.
Corresponding to the above method embodiment, the virtual bass generating circuit is specifically configured to:
and acquiring the amplitude of the fundamental frequency point, determining an amplitude interval to which the amplitude of the fundamental frequency point belongs, and generating virtual bass by adopting a virtual bass generating function corresponding to the amplitude interval.
Corresponding to the above method embodiments, the virtual bass generating circuit is specifically configured to:
when the amplitude of the fundamental frequency point is within the range of 0-0.4V, generating virtual bass by adopting a first virtual bass generating function;
when the amplitude of the fundamental frequency point is within the range of 0.4V-0.55V, generating virtual bass by adopting a second virtual bass generating function;
when the amplitude of the fundamental frequency point is within the range of 0.55V-0.7V, generating virtual bass by adopting a second virtual bass generating function;
and when the amplitude of the fundamental frequency point is within the range of 0.7V-1V interval, generating virtual bass by adopting a second virtual bass generating function.
Corresponding to the above device, the application also discloses an audio output device, which is applied with the bass enhancing device.
The audio output device can be an earphone, a mobile phone or other electronic devices with audio output function.
For convenience of description, the above system is described as being functionally divided into various modules, respectively. Of course, the functions of each module may be implemented in the same piece or pieces of software and/or hardware when implementing the present invention.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of bass enhancement, comprising:
acquiring audio data to be processed;
processing the audio data to be processed to obtain a high-pass filtering signal;
processing the audio data to be processed to obtain a band-pass filtering signal;
generating virtual bass corresponding to the band-pass filtering signal according to the amplitude of the fundamental frequency point of the band-pass filtering signal;
filtering the virtual bass to obtain a target frequency band signal;
and mixing the high-pass filtered signal with the target frequency band signal and outputting the mixed signal.
2. The bass enhancement method of claim 1, wherein generating a virtual bass corresponding to the bandpass filtered signal comprises:
framing the band-pass filtered signal;
detecting the amplitude of a fundamental frequency point of the band-pass filtering signal after framing treatment;
and generating virtual bass by adopting a virtual bass generating function which is matched with the amplitude of the fundamental frequency point.
3. The bass enhancement method according to claim 2, wherein detecting the amplitude of the fundamental frequency point of the band-pass filtered signal after framing processing includes:
detecting the fundamental frequency point of the band-pass filtering signal after framing treatment by adopting a zero-crossing rate method, an autocorrelation function method or a cepstrum method, and obtaining the amplitude of the fundamental frequency point.
4. The bass enhancement method of claim 2, wherein framing the band-pass filtered signal comprises:
and framing the band-pass filtered signals by taking continuous N band-pass filtered signals as one frame, wherein N is a positive integer greater than 1.
5. The bass enhancement method of claim 2, wherein generating a virtual bass using a virtual bass generating function adapted to the magnitude of the fundamental frequency point comprises:
and acquiring the amplitude of the fundamental frequency point, determining an amplitude interval to which the amplitude of the fundamental frequency point belongs, and generating virtual bass by adopting a virtual bass generating function corresponding to the amplitude interval.
6. The bass enhancement method of claim 5, wherein determining an amplitude interval to which the amplitude of the fundamental frequency point belongs, generating a virtual bass using a virtual bass generating function corresponding to the amplitude interval, comprises:
when the amplitude of the fundamental frequency point is within the range of 0-0.4V, generating virtual bass by adopting a first virtual bass generating function;
when the amplitude of the fundamental frequency point is within the range of 0.4V-0.55V, generating virtual bass by adopting a second virtual bass generating function;
when the amplitude of the fundamental frequency point is within the range of 0.55V-0.7V, generating virtual bass by adopting a second virtual bass generating function;
and when the amplitude of the fundamental frequency point is within the range of 0.7V-1V interval, generating virtual bass by adopting a second virtual bass generating function.
7. A bass boost chip comprising a memory and a processor;
the memory is used for storing programs;
the processor configured to execute the program to implement the bass enhancement method of any one of claims 1-6.
8. A bass enhancement apparatus, comprising:
the high-pass filter is used for processing the audio data to be processed to obtain a high-pass filtering signal;
the first band-pass filter is used for processing the audio data to be processed to obtain band-pass filtering signals;
the virtual bass generation module is used for generating virtual bass corresponding to the band-pass filtering signal according to the amplitude of the fundamental frequency point of the band-pass filtering signal, and the first parameter is the amplitude of the fundamental frequency point of the band-pass filtering signal;
the second band-pass filter is used for filtering the virtual bass to obtain a target frequency band signal;
and the mixer is used for mixing and outputting the high-pass filtering signal and the target frequency band signal.
9. The bass enhancement apparatus of claim 8, wherein the virtual bass generation module specifically comprises:
the framing circuit is used for framing the band-pass filtering signal;
the fundamental frequency detection circuit is used for detecting fundamental frequency points of the band-pass filtered signals after framing treatment;
the amplitude detection module is used for detecting the amplitude of the fundamental frequency point;
and the virtual bass generating circuit is used for generating virtual bass by adopting a virtual bass generating function which is matched with the amplitude of the fundamental frequency point.
10. An audio output device, characterized in that a bass enhancing apparatus as claimed in any one of claims 8-9 is applied.
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