CN108600915A - A kind of method, apparatus of audio output, harmonic distortion filtering equipment and terminal - Google Patents
A kind of method, apparatus of audio output, harmonic distortion filtering equipment and terminal Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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Abstract
The invention discloses a kind of methods of audio output, are related to audio data processing technology field, the harmonic distortion problems for solving existing terminal audio frequency output.Including：Pick up the audio signal of loud speaker；Extract the corresponding audio signal of each default harmonic distortion frequency range in audio signal；The corresponding audio signal of each default harmonic distortion frequency range be subjected to reverse phase amplifieroperation obtain harmonic distortion to filter out audio signal；Harmonic distortion is filtered out after audio signal is added to corresponding original audio signal and forms exports audio signal；This method is reduced by the way that terminal system is filtered out harmonic distortion as a whole and is caused harmonic distortion problems due to the physical arrangement of terminal entirety in the prior art, and auditory effect of the user to audio signal is improved；The invention also discloses a kind of device of audio output, harmonic distortion filtering equipment, terminal and computer readable storage mediums, have above-mentioned advantageous effect.
Description
Technical field
The present invention relates to technical field of data processing, more particularly to a kind of method, apparatus of audio output, harmonic distortion filter
Except equipment, terminal and computer readable storage medium.
Background technology
Currently, the terminal with audio output function can have harmonic distortion when exporting audio, the harmonic distortion is general
It is to be caused due to physical arrangement of terminal etc., the distribution of this kind of distortion frequency range stablizes and is distorted larger, influences hearing effect.Example
The existing harmonic distortion after designing of such as most earphone products is usually to have horn single body and cavity body structure object
Reason factor causes,
Wherein, harmonic wave refers to a kind of distortion of normal current waveform, usually by nonlinear load transmitting.Harmonic distortion
(HD) ratio of root mean square (RMS) value and signal level root-mean-square value of target harmonic wave (second order, three ranks) etc. is referred to.Harmonic wave loses
Caused by being really not fairly linear due to system.
Invention content
The object of the present invention is to provide a kind of method, apparatus of audio output, harmonic distortion filtering equipment, terminal and calculating
Machine readable storage medium storing program for executing reduces and causes harmonic distortion problems due to the physical arrangement of terminal entirety in the prior art, carries
Auditory effect of the high user to audio signal.
In order to solve the above technical problems, the present invention provides a kind of method of audio output, the method includes：
Pick up the audio signal of loud speaker；
Extract the corresponding audio signal of each default harmonic distortion frequency range in the audio signal；
The corresponding audio signal of each default harmonic distortion frequency range is subjected to reverse phase amplifieroperation and obtains harmonic distortion filter
Except audio signal；
The harmonic distortion is filtered out after audio signal is added to corresponding original audio signal and forms exports audio signal.
Optionally, the corresponding audio signal of each default harmonic distortion frequency range in the audio signal is extracted, including：
The filter for being utilized respectively each default harmonic distortion frequency range extracts corresponding audio signal in the audio signal.
Optionally, when the filter is digital filter, by the corresponding audio of each default harmonic distortion frequency range
Signal progress reverse phase amplifieroperation obtains harmonic distortion and filters out audio signal, including：
The corresponding audio signal of each default harmonic distortion frequency range is subjected to operated in anti-phase, and after adjusting operated in anti-phase
The gain of audio signal obtains harmonic distortion and filters out audio signal.
When the filter is R/C filter circuits, by the corresponding audio signal of each default harmonic distortion frequency range into
Row reverse phase amplifieroperation obtains harmonic distortion and filters out audio signal, including：
The corresponding audio signal of each default harmonic distortion frequency range is inputted into corresponding see-saw circuit and obtains harmonic wave
Distortion filters out audio signal.
Optionally, the method further includes：
According to the total harmonic distortion test result of terminal, each default harmonic distortion frequency range is determined.
Optionally, the harmonic distortion is filtered out into formation after audio signal is added to corresponding original audio signal and exports sound
Frequency signal, including：
Each default harmonic distortion frequency range in corresponding original audio signal is compensated according to original frequency response curve
It is compensated audio signal；
The harmonic distortion is filtered out after audio signal is added to the compensating audio signal and forms exports audio signal.
Optionally, by each default harmonic distortion frequency range in corresponding original audio signal according to original frequency response curve into
Row compensation is compensated audio signal, including：
The compensating filter for being utilized respectively each default harmonic distortion frequency range mends corresponding original audio signal
It repays and is compensated audio signal；Wherein, the compensating gain in the compensating filter is terminal in corresponding default harmonic distortion frequency
Compensating gain when as the frequency response frequency response corresponding with original frequency response curve under section.
Optionally, the method further includes：
When being filtered out without harmonic distortion, frequency sound test is carried out to terminal and obtains original frequency response curve.
The present invention also provides a kind of devices of audio output, including：
Filter module, the corresponding audio letter of each default harmonic distortion frequency range in the audio signal for extracting loud speaker pickup
Number；
Reverse phase amplification module is grasped for the corresponding audio signal of each default harmonic distortion frequency range to be carried out reverse phase amplification
It obtains harmonic distortion and filters out audio signal；
Output module is formed for filtering out the harmonic distortion after audio signal is added to corresponding original audio signal
Exports audio signal.
Optionally, the reverse phase amplification module be specially by the corresponding audio signal of each default harmonic distortion frequency range into
Row operated in anti-phase, and the gain for adjusting the audio signal after operated in anti-phase obtains the module that harmonic distortion filters out audio signal.
The present invention also provides a kind of harmonic distortion filtering equipments, including：
Pick up the MIC of the audio signal of loud speaker；
It is connected with the MIC output ends, extracts the corresponding audio letter of each default harmonic distortion frequency range in the audio signal
Number filter；
It is connected with the output end of the filter, the corresponding audio signal of each default harmonic distortion frequency range is carried out anti-
Mutually amplification obtains the see-saw circuit that harmonic distortion filters out audio signal；
Wherein, the loud speaker is connected with the output end of the see-saw circuit 300, plays exports audio signal；Institute
It is that the harmonic distortion is filtered out audio signal to be added to corresponding original audio letter by original channel to state exports audio signal
It is formed after number.
Optionally, the filter is R/C filter circuits.
Optionally, the harmonic distortion filtering equipment further includes：
It is arranged between original channel input terminal and the original channel output end, it will be each in corresponding original audio signal
The default harmonic distortion frequency range compensates the compensating filter for being compensated audio signal according to original frequency response curve.
Optionally, the compensating filter includes：R/C filter circuits and the amplification being connected with the R/C filter circuits
Circuit.
The present invention also provides a kind of terminals, including harmonic distortion filtering equipment described above.
Optionally, the terminal is earphone, wherein the MIC is arranged in earphone ante-chamber.
The present invention also provides a kind of computer readable storage medium, calculating is stored on the computer readable storage medium
The step of machine program, the computer program realizes the method for audio output as described above when being executed by processor.
A kind of method of audio output provided by the present invention, including：Pick up the audio signal of loud speaker；Extract audio letter
The corresponding audio signal of each default harmonic distortion frequency range in number；The corresponding audio signal of each default harmonic distortion frequency range is carried out anti-
Phase amplifieroperation obtains harmonic distortion and filters out audio signal；Harmonic distortion is filtered out into audio signal and is added to corresponding original audio
Exports audio signal is formed after signal.
It is filtered out as it can be seen that this method carries out harmonic distortion to the real-time audio signal that terminal is exported by loud speaker, due to
The audio signal of loud speaker output is the final audio signal of terminal, that is, terminal system to be filtered out to harmonic wave mistake as a whole
Very, reduce and cause harmonic distortion problems due to the physical arrangement of terminal entirety in the prior art, improve user to audio
The auditory effect of signal；The present invention also provides a kind of device of audio output, harmonic distortion filtering equipment, terminal and computers
Readable storage medium storing program for executing has above-mentioned advantageous effect, and details are not described herein.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
The flow chart of the method for the audio output that Fig. 1 is provided by the embodiment of the present invention；
The schematic diagram of the installation positions MIC in the earphone that Fig. 2 is provided by the embodiment of the present invention；
The THD schematic diagrames for the earphone that Fig. 3 is provided by the embodiment of the present invention；
The flow chart of the method for another audio output that Fig. 4 is provided by the embodiment of the present invention；
The program that Fig. 5 is provided by the embodiment of the present invention realizes that harmonic distortion removes and compensates the structure of original audio signal
Schematic diagram；
The hardware circuit that Fig. 6 is provided by the embodiment of the present invention realizes that harmonic distortion removes and compensates original audio signal
Structural schematic diagram；
The structure diagram of the device for the audio output that Fig. 7 is provided by the embodiment of the present invention；
The structure diagram of the device for another audio output that Fig. 8 is provided by the embodiment of the present invention；
The structure diagram for the harmonic distortion filtering equipment that Fig. 9 is provided by the embodiment of the present invention；
A kind of schematic diagram for R/C filter circuits that Figure 10 is provided by the embodiment of the present invention；
The structure diagram for another harmonic distortion filtering equipment that Figure 11 is provided by the embodiment of the present invention.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to FIG. 1, the flow chart of the method for the audio output that Fig. 1 is provided by the embodiment of the present invention；This method can be with
Including：
S100, the audio signal for picking up loud speaker.
Harmonic distortion is typically due to the reasons such as the physical arrangement of terminal and causes, and this kind of distortion frequency range distribution is stablized and is distorted
It is larger, influence hearing effect.And some existing methods for reducing harmonic distortion are generally all carried out just for some component,
But the presence of other component also still can cause a part of harmonic distortion phenomenon, therefore its can not realize it is whole to terminal into
Row harmonic distortion filters out.Since the audio signal of loud speaker output is exactly the audio for the terminal final output that user can hear
Signal, therefore the present embodiment carries out harmonic distortion to the audio signal of loud speaker output in order to solve problems in the prior art and filters out
Terminal system is filtered out harmonic distortion to realize, reduced in the prior art due to the object of terminal entirety by processing as a whole
Reason reasons in structure causes harmonic distortion problems, improves auditory effect of the user to audio signal.
The present embodiment does not limit the concrete mode of the audio signal of pickup loud speaker, such as can be picked up and be raised by MIC
The audio signal of sound device.But the specific installation position of MIC is not defined in the present embodiment.It is needed according to terminal
Concrete type and the specific location of corresponding loud speaker setting are accordingly arranged.Such as when terminal is specially earphone, due to
Earphone ante-chamber can be good at receiving the audio signal of loud speaker in earphone, therefore MIC can be arranged and raise one's voice can receive
In the earphone ante-chamber of the audio signal of device output, specifically please refer to Fig.2.Such as speaker cover, the positions such as Earcap supporter.
The corresponding audio signal of each default harmonic distortion frequency range in S110, extraction audio signal.
Due to Terminal Design, for example, loud speaker setting position etc., can cause terminal the distortion of certain frequency ranges compared with
It is high.These frequency ranges are corresponding with default harmonic distortion frequency range.Since the different distortions that it can be caused to obtain of each terminal are higher
Frequency range be not quite similar, corresponding obtained default harmonic distortion frequency range will not be identical.Further, due to the appearance to harmonic distortion
The difference for degree of bearing, even if will also result in same terminal, but the higher frequency range of distortion finally determined is different (because determination is assorted
It is that the higher standard of distortion can be different, which can voluntarily be determined by user), and then corresponding default harmonic distortion frequency
Section identical (because determining that the selection for the frequency range that harmonic distortion generates can be different, such as will not choose the corresponding frequency of 2 subharmonic
Rate, or choose 2 times and the corresponding frequency range of 3 subharmonic).The present embodiment does not limit the determination of each default harmonic distortion frequency range
Method does not limit the quantity of final default harmonic distortion frequency range yet.As long as user can be according to the practical harmonic distortion feelings of terminal
The demand that condition and practical harmonic distortion filter out degree determines each default harmonic distortion frequency range.Further, due to terminal
THD (total harmonic distortion) can determine the higher frequency range of distortion, and then can be distorted the corresponding major harmonic of each frequency range
The frequency range of concentration is as the corresponding default harmonic distortion frequency range of the frequency range.
It is optional i.e. in the present embodiment, according to the total harmonic distortion test result of terminal, determine each default harmonic distortion frequency
Section.The process is illustrated by taking earphone as an example below, is specifically please referred to Fig.3.Due to loudspeaker monomer and earphone cavity design
Reason, usual earphone can be higher in the distortion of certain frequency ranges, such as Fig. 3,20Hz-110Hz, 4000Hz-5000Hz.Product physical arrangement
After sizing, the THD (total harmonic distortion) of test product finds and is distorted higher frequency range, by taking 20Hz as an example.20Hz frequency range harmonic waves
The frequency range that distortion generates concentrates on 40-60Hz (main energetic of distortion concentrates on 2 times and 3 subharmonic).Therefore 20Hz is corresponding
Default harmonic distortion frequency range is 40Hz-60Hz.The corresponding whole of terminal preset harmonic distortion frequency range need to audio signal into
Row harmonic distortion filters out corresponding each frequency range.The corresponding audio signal of each default harmonic distortion frequency range is all subsequently walked
Rapid harmonic distortion, which filters out operation, can realize the harmonic filtration processing that audio is exported to entire terminal.
The main purpose of the step determines that needing to carry out harmonic distortion filters out the default harmonic distortion frequency range of each of operation
Corresponding audio signal.The present embodiment is not to the corresponding audio signal of each default harmonic distortion frequency range in extraction audio signal
Concrete mode is defined.Due to needing to extract the corresponding audio signal of each default harmonic distortion frequency range.Therefore in order to extract
Audio signal accuracy, optionally, be utilized respectively each default harmonic distortion frequency range filter extraction audio signal in it is right
The audio signal answered.I.e. each default harmonic distortion frequency range corresponds to a filter, has several default harmonic distortion frequency ranges will
It is corresponding with several filters.Such as when there are two default harmonic distortion frequency range 40Hz-60Hz and 1200Hz-2400Hz,
There are two filter, 40Hz-60Hz to correspond to first filter for tool, and 1200Hz-2400Hz corresponds to another filter.
Further, the type of the present embodiment not limiting filtering device, can be selected according to the actual conditions of terminal.Example
The extraction of the audio signal of corresponding default harmonic distortion frequency range can be such as carried out by digital filter or filter circuit.Specifically
The specific design process of the corresponding digital filter of each default harmonic distortion frequency range or filter circuit (such as R/C filter circuits)
And the determination of component parameter can refer to the design process of prior art filter and the reality of default harmonic distortion frequency range
Border demand.
S120, it the corresponding audio signal of each default harmonic distortion frequency range is subjected to reverse phase amplifieroperation obtains harmonic distortion filter
Except audio signal.
This step main purpose is exactly to carry out reverse phase to the corresponding audio signal of each default harmonic distortion frequency range of extraction
Amplifieroperation.The corresponding audio signal of each default harmonic distortion frequency range of extraction is carried out by reverse phase amplifieroperation anti-
Phase can remove these harmonic distortions when being subsequently overlapped the audio signal Jing Guo reverse phase with original audio signal.This
Embodiment is not also defined specific reverse phase amplifieroperation.Such as it can be carried out according to the selection of step S110 median filters
The design of corresponding reverse phase amplifieroperation.I.e. when step S110 median filters be digital filter, design digital inverse can be corresponded to
Amplification procedure executes step S120；When step S110 median filters be R/C filter circuits, can correspond to design digital inverse amplification
Circuit executes step S120.Wherein, the specific design process and first device of each reverse phase amplification procedure or see-saw circuit
The determination of part parameter can refer to the actual demand of the design process and default harmonic distortion frequency range of prior art filter.
It, will the corresponding audio signal progress of each default harmonic distortion frequency range specifically, when filter is digital filter
Reverse phase amplifieroperation obtains harmonic distortion and filters out audio signal：By the corresponding audio letter of each default harmonic distortion frequency range
Number operated in anti-phase is carried out, and the gain for adjusting the audio signal after operated in anti-phase obtains harmonic distortion and filters out audio signal.
Wherein, operated in anti-phase and gain adjustment process (can such as pass through digital inverse by corresponding software program
Device is realized and digital gain adjusting device) it realizes.The purpose of operated in anti-phase is carried out primarily to by itself and original audio signal
Harmonic distortion corresponding audio signal decay when being overlapped to achieve the effect that harmonic carcellation is distorted.And then gain-adjusted master
If in order to be amplified to the signal.
Further, the output of the corresponding digital filter of each default harmonic distortion frequency range can be summarized in the present embodiment
Final harmonic distortion, which is obtained, to a reverse phase amplification procedure progress reverse phase amplifieroperation filters out audio signal.Can also be will be every
The output signal of the corresponding digital filter of a default harmonic distortion frequency range is input in corresponding reverse phase amplification procedure, will be each
The harmonic distortion that reverse phase amplification procedure obtains filters out audio signal and is summarized, and obtains final harmonic distortion and filters out audio letter
Number.In order to ensure the effect of harmonic carcellation distortion, can be each default harmonic distortion frequency range design corresponding operated in anti-phase with
And gain values, i.e., each is preset into the corresponding audio signal of harmonic distortion frequency range and carry out corresponding operated in anti-phase, and adjusted
The gain of audio signal after operated in anti-phase obtains this for corresponding gain values and presets the corresponding harmonic wave mistake of harmonic distortion frequency range
Really filter out audio signal.The corresponding harmonic distortion of each default harmonic distortion frequency range is filtered out audio signal to summarize, is obtained
Final harmonic distortion filters out audio signal.
When filter is R/C filter circuits, the corresponding audio signal of each default harmonic distortion frequency range is subjected to reverse phase and is put
Big operation obtains harmonic distortion and filters out audio signal, including：By the corresponding audio signal input pair of each default harmonic distortion frequency range
The see-saw circuit answered obtains harmonic distortion and filters out audio signal.
Wherein, the output of the corresponding filter of each default harmonic distortion frequency range can be summarized to one in the present embodiment
See-saw circuit progress reverse phase amplifieroperation obtains final harmonic distortion and filters out audio signal.Can also be each to preset
The output signal of the corresponding filter of harmonic distortion frequency range is input in its corresponding see-saw circuit, and each reverse phase is amplified
The harmonic distortion that circuit obtains filters out audio signal and is summarized, and obtains final harmonic distortion and filters out audio signal.In order to protect
It demonstrate,proves the effect of harmonic carcellation distortion, can be that each default harmonic distortion frequency range designs corresponding see-saw circuit, i.e., it will be every
The corresponding audio signal of one default harmonic distortion frequency range using corresponding see-saw circuit carry out reverse phase amplify to obtain this it is pre-
If the corresponding harmonic distortion of harmonic distortion frequency range filters out audio signal.The corresponding harmonic distortion of harmonic distortion frequency range will each be preset
It filters out audio signal to be summarized, obtains final harmonic distortion and filter out audio signal.
S130, it harmonic distortion is filtered out to audio signal is added to after corresponding original audio signal and form output audio letter
Number.
It is folded with corresponding original audio signal specifically, the harmonic distortion for carrying out reverse phase is filtered out audio signal by the step
Audio signal can be filtered out after adding by harmonic distortion and filters out corresponding harmonic distortion signal in corresponding original audio signal,
Then the effect of harmonic distortion in removal original audio signal is realized.By the finally obtained audio letter for eliminating harmonic distortion
It number exports to loud speaker as exports audio signal, the audio signal for eliminating harmonic distortion that user hears at this time, it can be with
The auditory effect of user is improved, usage experience of the user to terminal is promoted.
Below using earphone as terminal, audio signal is music signal, and is 40Hz-60Hz with default harmonic distortion frequency range
For illustrate the detailed process of the present embodiment：MIC picks up the music signal in earphone ante-chamber, and music signal is transmitted to filtered electrical
Road, setting filter circuit extract the music signal of 40-60Hz frequency ranges and by its reverse phases, adjust fixed-bandwidth is anti-after gain G
Phase audio signal (i.e. harmonic distortion filters out audio signal) is transferred to loud speaker i.e. loudspeaker after being superimposed with corresponding original music signal
.
Further, by being filtering out the whole object implementatio8 harmonic distortion the most of terminal in this present embodiment, therefore can be with
Overcome need in the prior art pre-read in advance for a period of time in audio signal, it is carried out reduce after harmonic distortion processing
Output, while reading the audio signal in lower a period of time and repeating to operate.It may be implemented in the present embodiment in real time to raising one's voice
Audio signal in device reduce the processing of harmonic distortion, and processing timeliness is more preferable.
Based on the above-mentioned technical proposal, the method for audio output provided in an embodiment of the present invention, it is defeated by loud speaker to terminal
The real-time audio signal gone out carries out harmonic distortion and filters out, since the audio signal of loud speaker output is the final audio letter of terminal
Number, that is, terminal system is filtered out harmonic distortion as a whole, reduce in the prior art due to the physics of terminal entirety
Reasons in structure causes harmonic distortion problems, improves auditory effect of the user to audio signal.
Based on above-described embodiment, due to also can be to original when obtaining harmonic distortion and filtering out audio signal in above-described embodiment
The signal of anharmonic wave distortion has also carried out reverse phase decaying in audio signal, such as the harmonic distortion of 20Hz is declined in above-described embodiment
Subtract, while the original music signal of 40-60Hz is also attenuated.To compensate the decaying of original music signal, in original signal channel
Compensating module is added, the music signal accidentally to be declined is made up.Therefore it in order to make up the original audio signal accidentally decayed, further carries
High user can compensate the original audio signal of accidentally decaying the auditory effect of audio signal in the present embodiment.This implementation
Example is not defined specific compensation way, such as can be compensated by original frequency response curve.Detailed process please join
Examine Fig. 4, the flow chart of the method for another audio output that Fig. 4 is provided by the embodiment of the present invention；This method may include：
S200, the audio signal for picking up loud speaker.
The corresponding audio signal of each default harmonic distortion frequency range in S210, extraction audio signal.
S220, it the corresponding audio signal of each default harmonic distortion frequency range is subjected to reverse phase amplifieroperation obtains harmonic distortion filter
Except audio signal.
Wherein, the detailed process of step S200- steps S220 can refer to the particular content in above-described embodiment.
S230, each default harmonic distortion frequency range in corresponding original audio signal is compensated according to original frequency response curve
It is compensated audio signal.
Harmonic distortion frequency range is preset in the present embodiment to each in original audio signal by original frequency response curve to correspond to
Audio signal compensate.The original audio signal accidentally decayed in original audio signal is compensated.Such as it will be every
The current frequency response curve of the corresponding audio signal of one default harmonic distortion frequency range is adjusted to consistent with original frequency response curve, to
Compensate for corresponding original audio signal.Specifically, the output of each compensating filter summarizes to original channel in the present embodiment
Summarize being compensated audio signal with other remaining original audio signals not compensated in original channel.
Wherein, the present embodiment is not defined the acquisition process and acquisition modes of original frequency response curve.It can root
It is determined according to the actual conditions of terminal.Preferably, when being filtered out without harmonic distortion, frequency sound test is carried out to terminal and is obtained
Original frequency response curve.It illustrates, such as after earphone design phase early period determines acoustics scheme, obtains former by taking earphone as an example
Earphone is placed into human simulation (such as HATS) head by beginning frequency response curve P0 specifically, in the case where being filtered out without harmonic distortion
On, measure original frequency response curve P0.
The present embodiment is not defined the process specifically compensated by original frequency response curve.Optionally, divide
Corresponding original audio signal is not compensated using the compensating filter of each default harmonic distortion frequency range and is compensated audio
Signal；Wherein, the compensating gain in compensating filter is frequency response and original of the terminal under corresponding default harmonic distortion frequency range
Compensating gain when corresponding frequency response is the same in beginning frequency response curve.
Specifically, each default harmonic distortion frequency range corresponds to a compensating filter, there are several default harmonic distortion frequency ranges
Several compensating filters will be corresponding with.Such as when there are two default harmonic distortion frequency range 40Hz-60Hz and 1200Hz-
When 2400Hz, there are two compensating filter, 40Hz-60Hz to correspond to the first compensating filter for tool, and 1200Hz-2400Hz corresponds to another
A compensating filter.
Further, the present embodiment does not limit the type of compensating filter, can be selected according to the actual conditions of terminal
It selects.Such as it can be by digital compensation filter or compensation filter circuit to the corresponding original audio for presetting harmonic distortion frequency range
Signal compensates.The corresponding digital compensation filter of specific each default harmonic distortion frequency range or compensation filter circuit are (such as
R/C compensation filters circuits) specific design process and the determination of component parameter can refer to prior art filter and setting
The limitation of meter process and original frequency response curve.Wherein, it is required that final compensation in compensating filter parameter determination process
The corresponding compensating gain of filter enables in the frequency response and original frequency response curve under corresponding default harmonic distortion frequency range
Corresponding frequency response is the same.It is directed to each default harmonic distortion frequency range during redesigning compensating filter, adjusts
Compensating gain numerical value measures the frequency response P1 of terminal at this time, judges whether P1 is equal to P0, if then the compensating gain numerical value is
For the corresponding compensating gain of compensating filter under the final default harmonic distortion frequency range.Compensating gain is adjusted if P1 is not equal to P0
When measuring P1=P0, compensating gain numerical value that fixed gain will be current is preset as this to be mended numerical value under harmonic distortion frequency range
Repay the corresponding compensating gain of filter.
Further, in order to ensure that compensation effect can also increase the function of amplified signal in compensating filter, such as when
Compensating filter can increase amplifying circuit (such as amplifier) in the circuit when being compensation filter circuit, naturally it is also possible to mend
It repays and individually increases an amplifying circuit except filter circuit.
S240, harmonic distortion is filtered out after audio signal is added to compensating audio signal and forms exports audio signal.
Specifically, the harmonic distortion for carrying out reverse phase is filtered out audio signal and the corresponding compensation sound compensated by the step
It can realize that filtering out audio signal using harmonic distortion filters out in corresponding original audio signal accordingly after frequency Signal averaging
Harmonic distortion signal, the original audio signal accidentally decayed is compensated for further through compensating audio signal.Then it realizes and both goes
Except harmonic distortion ensures effect that original audio signal is not attenuated in original audio signal again.By finally obtained audio signal
It is exported to loud speaker as exports audio signal, what user heard at this time not only eliminates harmonic distortion but also ensure original audio signal
The audio signal not being attenuated can improve the auditory effect of user, promote usage experience of the user to terminal.
Fig. 5 and Fig. 6 are turned next to, the program that respectively embodiment of the present invention is provided realizes that harmonic distortion is removed and mended
It repays the structural schematic diagram of original audio signal and hardware circuit realizes that harmonic distortion removes and compensates the knot of original audio signal
Structure schematic diagram.It is recognized that terminal specifically carries out the detailed process of harmonic distortion attenuation and corresponding by the two figures
The signal transduction process of audio signal.Fig. 5 is mainly to be made dependent on the chip with computing capability such as DSP or CPU with software
For executive agent, Fig. 6 is then using hardware circuit such as filter circuit and amplifier etc. as executive agent.It should be noted that
Fig. 5 and Fig. 6 is only illustrated by taking a default harmonic distortion frequency range as an example.When terminal needs multiple default harmonic distortion frequency ranges
When, it is only necessary at compensating filter both ends, in parallel other preset the corresponding compensating filter of harmonic distortion frequency range, and are raising one's voice
In parallel other in the output end both ends of device (SPK) input terminal and MIC preset the corresponding series arm of harmonic distortion frequency range (for figure
The 6 i.e. concatenated branch of R/C filters and see-saw circuit).
Based on the above-mentioned technical proposal, the method for audio output provided in an embodiment of the present invention, it is defeated by loud speaker to terminal
The real-time audio signal gone out carries out harmonic distortion and filters out, since the audio signal of loud speaker output is the final audio letter of terminal
Number, that is, terminal system is filtered out harmonic distortion as a whole, reduce in the prior art due to the physics of terminal entirety
Reasons in structure causes harmonic distortion problems, and realizes the compensation to original audio signal simultaneously, further increases user to audio
The auditory effect of signal.
Below to the device of audio output provided in an embodiment of the present invention, harmonic distortion filtering equipment, terminal and computer
Readable storage medium storing program for executing is introduced, and device, harmonic distortion filtering equipment, terminal and the computer of audio output described below can
Reference can be corresponded with the method for above-described audio output by reading storage medium.
Referring to FIG. 7, the structure diagram of the device for the audio output that Fig. 7 is provided by the embodiment of the present invention；The device can
To include：
Filter module 101, the corresponding sound of each default harmonic distortion frequency range in the audio signal for extracting loud speaker pickup
Frequency signal；
Reverse phase amplification module 102 is grasped for the corresponding audio signal of each default harmonic distortion frequency range to be carried out reverse phase amplification
It obtains harmonic distortion and filters out audio signal；
Output module 103 is formed for filtering out harmonic distortion after audio signal is added to corresponding original audio signal
Exports audio signal.
Based on above-described embodiment, the filter that filter module 101 is specially utilized respectively each default harmonic distortion frequency range carries
Take the module of corresponding audio signal in audio signal.
Based on above-mentioned any embodiment, reverse phase amplification module 102 is specially by the corresponding sound of each default harmonic distortion frequency range
Frequency signal carries out operated in anti-phase, and the gain for adjusting the audio signal after operated in anti-phase obtains harmonic distortion and filters out audio signal
Module.
Based on above-mentioned any embodiment, which further includes：
Total harmonic distortion test module determines that each default harmonic wave loses for the total harmonic distortion test result according to terminal
True frequency range.
Based on above-mentioned any embodiment, referring to FIG. 8, the device further includes：
Audio compensation module 104 is used for each default harmonic distortion frequency range in corresponding original audio signal according to original
Frequency response curve, which compensates, is compensated audio signal；
Corresponding output module forms output for filtering out harmonic distortion after audio signal is added to compensating audio signal
Audio signal.
Based on above-described embodiment, audio compensation module 104 is specially to be utilized respectively the compensation of each default harmonic distortion frequency range
Filter compensates corresponding original audio signal the module for being compensated audio signal；Wherein, in compensating filter
Compensating gain is that frequency response with original frequency response curve corresponding frequency of the terminal under corresponding default harmonic distortion frequency range is rung
Compensating gain when should be the same.
Based on above-described embodiment, which further includes：
Original frequency response curve module, for when being filtered out without harmonic distortion, carrying out frequency sound test to terminal and obtaining original
Beginning frequency response curve.
It should be noted that being based on above-mentioned any embodiment, described device can be realized based on programmable logic device
, programmable logic device includes FPGA, CPLD, microcontroller, DSP, CPU etc..These programmable logic device can be arranged
In terminal (such as earphone).The corresponding embodiment of i.e. above-mentioned each device mainly passes through digital processing mode, that is, software form and realizes
Harmonic distortion handles and follow-up corresponding original audio signal compensation process.I.e. corresponding executive agent is programmable logic device
Part.
Referring to FIG. 9, the structure diagram for the harmonic distortion filtering equipment that Fig. 9 is provided by the embodiment of the present invention；The harmonic wave
Being distorted filtering equipment may include：
Pick up the MIC100 of the audio signal of loud speaker；
It is connected with MIC100 output ends, extracts the filter of the corresponding audio signal of each default harmonic distortion frequency range in audio signal
Wave device 200；
It is connected with the output end of filter 200, the corresponding audio signal of each default harmonic distortion frequency range, which is carried out reverse phase, puts
Obtain the see-saw circuit 300 that harmonic distortion filters out audio signal greatly；
Wherein, loud speaker is connected with the output end of see-saw circuit 300, plays exports audio signal；Export audio letter
Number harmonic distortion is filtered out after audio signal is added to corresponding original audio signal by original channel and to be formed.
Harmonic distortion filtering equipment only includes MIC100, filter 200 and see-saw circuit 300 in the present embodiment.
Loud speaker and original channel are the component inherently having in terminal.Harmonic distortion filtering equipment includes in the present embodiment
The connection relation of all parts (MIC100, filter 200 and see-saw circuit 300) and original other component in terminal
As shown in Figure 9.The input terminal of MIC100 is used to pick up the audio signal of loud speaker, the input terminal phase of output end and filter 200
Even.The output end of filter 200 is connected with the input terminal of see-saw circuit 300, and the output end of see-saw circuit 300 passes through
Original channel is connected with the input terminal of loud speaker, i.e., the output end of see-saw circuit 300 by the audio signal of output export to
Final is exported audio output to loud speaker by original channel by original channel.
The present embodiment is not defined the concrete model of MIC100, and user can be carried out flexible with the actual conditions of terminal
Selection.The present embodiment is not also defined the concrete form of filter 200, and user is according to the size of terminal and cost etc.
Factor is selected.Preferably, filter is R/C filter circuits.The present embodiment is not to the specific of specific R/C filter circuits
Form is defined, and the actual conditions that user can refer to the R/C filter circuits of corresponding frequency band function in the prior art are set
It sets.Preferably, referring to FIG. 10, giving a kind of composition form of specific R/C filter circuits.R/C filter circuits include the
One resistance R1, second resistance R2,3rd resistor R3, the first capacitance C1, the second capacitance C2, third capacitance C3；Wherein, first resistor
The first end of R1 is connected with the output end of MIC100, and second end is connected with the first end of second resistance R2；The of second resistance R2
Two ends are connected with the second end of third capacitance C3；The first end of third capacitance C3 is connected with the first end of 3rd resistor R3；Third
The second end of resistance R3 is grounded；The first end of second capacitance C2 is connected with the second end of first resistor R1, and the of the second capacitance C2
Two ends are grounded；The first end of first capacitance C1 is connected with the first end of first resistor R1, second end and the first of 3rd resistor R3
End is connected.The numerical value of each capacitance and resistance in R/C filter circuits is not defined in the present embodiment, user can basis
The actual conditions of terminal and the R/C filter circuit actual functional capabilities are determined.
The present embodiment is not defined see-saw circuit 300, as long as can be achieved on the electricity of reverse phase enlarging function
Lu Junke with.In order to reduce the volume of see-saw circuit 300, preferred see-saw circuit 300 is specially that the first operation is put
Big device Q1；Wherein, the negative input of the first operational amplifier Q1 is connected with the output end of filter 200, and positive input connects
Ground, output end are connected with original channel output end.In the present embodiment not to the design parameter in the first operational amplifier Q1 into
Row limits, and user can be determined according to the actual conditions of terminal.
Based on above-mentioned any embodiment, another harmonic distortion that 1, Figure 11 is provided by the embodiment of the present invention is please referred to Fig.1
The structure diagram of filtering equipment；The harmonic distortion filtering equipment further includes：
It is arranged between original channel input terminal and original channel output end, it will be each default in corresponding original audio signal
Harmonic distortion frequency range compensates the compensating filter 400 for being compensated audio signal according to original frequency response curve.Compensation filter
The input terminal of device 400 receives original audio signal S, and output end accesses in original channel.
Specifically, the present embodiment is not also defined the concrete form of compensating filter 400, user is according to the big of terminal
The factors such as small and cost are selected.Preferably, compensating filter 400 be R/C filter circuits and with R/C filter circuit phases
Amplifying circuit even.The present embodiment is not defined the concrete form of specific R/C filter circuits, and user can refer to existing
There are the actual conditions of the R/C filter circuits of corresponding frequency band function in technology to be configured.Also not to the concrete form of amplifying circuit
It is limited, such as can be amplifier.
Preferably, referring to FIG. 10, giving a kind of composition form of specific R/C filter circuits.Amplifying circuit is
Two operational amplifier Q2；R/C filter circuits include the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 4th capacitance C4, the
Five capacitance C5, the 6th capacitance C6；Wherein, the positive input of second operational amplifier Q2 and the 4th resistance in R/C filter circuits
The first end of R4 is connected, and negative input ground connection, output end is connected with original channel output end；The second end of 4th resistance R4 with
The first end of 5th resistance R5 is connected；The second end of 5th resistance R5 is connected with the second end of the 6th capacitance C6；6th capacitance C6
First end be connected with the first end of the 6th resistance R6；The second end of 6th resistance R6 is grounded；The first end of 5th capacitance C5 with
The second end of 4th resistance R4 is connected, the second end ground connection of the 5th capacitance C5；The first end of 4th capacitance C4 and the 4th resistance R4
First end be connected, second end is connected with the first end of the 6th resistance R6.Not to each in R/C filter circuits in the present embodiment
The numerical value of capacitance and resistance is defined, and user can be according to the actual conditions of terminal and the R/C filter circuit actual functional capabilities
It is determined.The design parameter in the first operational amplifier Q2 is not defined in the present embodiment, user can be according to end
The actual conditions at end are determined.
In above-mentioned each embodiment when terminal needs multiple default harmonic distortion frequency ranges, it is only necessary in compensating filter two
In parallel other in end preset the corresponding compensating filter of harmonic distortion frequency range, and (here other preset the corresponding benefit of harmonic distortion frequency range
The composition for repaying filter is referred to the concrete form of the compensating filter write out in above-described embodiment and is configured, and user only needs
The corresponding parameter of each compensating filter is set in advance, then will be arranged in original after each compensating filter parallel connection
In beginning channel), and in the output end both ends of loud speaker (SPK) input terminal and MIC other default harmonic distortion frequency ranges in parallel
The series arm of corresponding filter and see-saw circuit composition (is directed to Fig. 9, that is, filter 200 and see-saw circuit 300
Concatenated branch).Here other preset the corresponding series arm median filter of harmonic distortion frequency range and reverse phase amplification electricity
The composition that the composition on road is referred to the series arm median filter and see-saw circuit write out in above-described embodiment is specific
Form is configured, and user only needs to set each series arm median filter in advance and see-saw circuit is corresponding
Then loud speaker (SPK) input terminal, that is, original channel will be arranged in original channel in parameter after each series arm parallel connection
In (at this time if the harmonic distortion filtering equipment does not have compensating filter directly by the output end of its see-saw circuit setting exist
Original channel directly sets the output end of its see-saw circuit if the harmonic distortion filtering equipment has compensating filter
Set the original channel after compensating filter output end) and MIC output end both ends.
The embodiment of the present invention also provides a kind of terminal, including the harmonic distortion filtering equipment described in above-mentioned any embodiment.
The terminal can be earphone either mobile phone etc..Preferably, when terminal is earphone, earphone is not limited in the present embodiment
It is fixed, such as can be headphone, In-Ear Headphones, wireless headset etc..Wherein, MIC is arranged in earphone ante-chamber.But this
Specific locations of the MIC in earphone ante-chamber is not limited in embodiment specifically.Such as the lid of horn hood, that is, loud speaker, ear muff branch
The positions such as frame.
Based on above-described embodiment, in order to improve the utilization ratio of MIC in terminal, terminal cost is reduced, MIC in the present embodiment
Specially feed back ANC MIC or inner ear call MIC.I.e. so that original MIC is realized on the basis of original function and picked up in terminal
Take the function of the audio signal of loud speaker.
The present invention also provides a kind of computer readable storage medium, computer journey is stored on computer readable storage medium
Sequence, the step of method of the audio output described in above-mentioned any embodiment is realized when computer program is executed by processor.Such as meter
The audio signal of pickup loud speaker is realized when calculation machine program is executed by processor；Extract each default harmonic distortion frequency in audio signal
The corresponding audio signal of section；The corresponding audio signal of each default harmonic distortion frequency range be subjected to reverse phase amplifieroperation obtain harmonic wave to lose
Really filter out audio signal；Harmonic distortion is filtered out formation output audio after audio signal is added to corresponding original audio signal to believe
Number.
The computer readable storage medium may include：USB flash disk, mobile hard disk, read-only memory (Read-Only
Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disc or CD etc. are various to deposit
Store up the medium of program code.
Each embodiment is described by the way of progressive in specification, the highlights of each of the examples are with other realities
Apply the difference of example, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is referring to method part illustration
.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, depends on the specific application and design constraint of technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
Above to a kind of method, apparatus of audio output provided by the present invention, harmonic distortion filtering equipment, terminal and meter
Calculation machine readable storage medium storing program for executing is described in detail.Specific case used herein to the principle of the present invention and embodiment into
Elaboration is gone, the explanation of above example is only intended to facilitate the understanding of the method and its core concept of the invention.It should be pointed out that pair
For those skilled in the art, without departing from the principle of the present invention, the present invention can also be carried out
Some improvements and modifications, these improvement and modification are also fallen within the protection scope of the claims of the present invention.
Claims (16)
1. a kind of method of audio output, which is characterized in that the method includes：
Pick up the audio signal of loud speaker；
Extract the corresponding audio signal of each default harmonic distortion frequency range in the audio signal；
The corresponding audio signal of each default harmonic distortion frequency range be subjected to reverse phase amplifieroperation obtain harmonic distortion to filter out sound
Frequency signal；
The harmonic distortion is filtered out after audio signal is added to corresponding original audio signal and forms exports audio signal.
2. according to the method described in claim 1, it is characterized in that, extracting each default harmonic distortion frequency range in the audio signal
Corresponding audio signal, including：
The filter for being utilized respectively each default harmonic distortion frequency range extracts corresponding audio signal in the audio signal.
3. according to the method described in claim 2, it is characterized in that, when the filter be digital filter when, will it is each described in
The corresponding audio signal of default harmonic distortion frequency range carries out reverse phase amplifieroperation and obtains harmonic distortion filtering out audio signal, including：
The corresponding audio signal of each default harmonic distortion frequency range is subjected to operated in anti-phase, and adjusts the audio after operated in anti-phase
The gain of signal obtains harmonic distortion and filters out audio signal.
When the filter is R/C filter circuits, the corresponding audio signal of each default harmonic distortion frequency range is carried out instead
Phase amplifieroperation obtains harmonic distortion and filters out audio signal, including：
The corresponding audio signal of each default harmonic distortion frequency range is inputted into corresponding see-saw circuit and obtains harmonic distortion
Filter out audio signal.
4. according to the method described in claim 1, it is characterized in that, further including：
According to the total harmonic distortion test result of terminal, each default harmonic distortion frequency range is determined.
5. according to claim 1-4 any one of them methods, which is characterized in that the harmonic distortion is filtered out audio signal and is added
Exports audio signal is formed after adding to corresponding original audio signal, including：
Each default harmonic distortion frequency range in corresponding original audio signal is compensated to obtain according to original frequency response curve
Compensating audio signal；
The harmonic distortion is filtered out after audio signal is added to the compensating audio signal and forms exports audio signal.
6. according to the method described in claim 5, it is characterized in that, by each default harmonic wave in corresponding original audio signal
Distortion frequency range is compensated according to original frequency response curve is compensated audio signal, including：
The compensating filter for being utilized respectively each default harmonic distortion frequency range compensates corresponding original audio signal
To compensating audio signal；Wherein, the compensating gain in the compensating filter is terminal under corresponding default harmonic distortion frequency range
Frequency response frequency response corresponding with original frequency response curve as when compensating gain.
7. according to the method described in claim 5, it is characterized in that, further including：
When being filtered out without harmonic distortion, frequency sound test is carried out to terminal and obtains original frequency response curve.
8. a kind of device of audio output, which is characterized in that including：
Filter module, the corresponding audio signal of each default harmonic distortion frequency range in the audio signal for extracting loud speaker pickup；
Reverse phase amplification module is obtained for the corresponding audio signal of each default harmonic distortion frequency range to be carried out reverse phase amplifieroperation
Audio signal is filtered out to harmonic distortion；
Output module forms output for filtering out the harmonic distortion after audio signal is added to corresponding original audio signal
Audio signal.
9. device according to claim 8, which is characterized in that the reverse phase amplification module is specially will be each described default humorous
The corresponding audio signal of wave distortion frequency range carries out operated in anti-phase, and the gain for adjusting the audio signal after operated in anti-phase obtains harmonic wave
Distortion filters out the module of audio signal.
10. a kind of harmonic distortion filtering equipment, which is characterized in that including：
Pick up the MIC of the audio signal of loud speaker；
It is connected with the MIC output ends, extracts the corresponding audio signal of each default harmonic distortion frequency range in the audio signal
Filter；
It is connected with the output end of the filter, the corresponding audio signal of each default harmonic distortion frequency range, which is carried out reverse phase, puts
Obtain the see-saw circuit that harmonic distortion filters out audio signal greatly；
Wherein, the loud speaker is connected with the output end of the see-saw circuit 300, plays exports audio signal；It is described defeated
It is to filter out the harmonic distortion after audio signal is added to corresponding original audio signal by original channel to go out audio signal
It is formed.
11. harmonic distortion filtering equipment according to claim 10, which is characterized in that the filter is R/C filtered electricals
Road.
12. the harmonic distortion filtering equipment according to claim 10 or 11, which is characterized in that further include：
It is arranged between original channel input terminal and the original channel output end, it will be each described in corresponding original audio signal
Default harmonic distortion frequency range compensates the compensating filter for being compensated audio signal according to original frequency response curve.
13. harmonic distortion filtering equipment according to claim 12, which is characterized in that the compensating filter includes：R/C
Filter circuit and the amplifying circuit being connected with the R/C filter circuits.
14. a kind of terminal, which is characterized in that including claim 10-13 any one of them harmonic distortion filtering equipments.
15. terminal according to claim 14, which is characterized in that the terminal is earphone, wherein the MIC settings exist
In earphone ante-chamber.
16. a kind of computer readable storage medium, which is characterized in that be stored with computer on the computer readable storage medium
Program, realizing the method for audio output as described in any one of claim 1 to 7 when the computer program is executed by processor
Step.
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| CN108600915B (en) | 2024-02-06 |
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