CN208445738U - A kind of harmonic distortion filtering equipment and terminal - Google Patents
A kind of harmonic distortion filtering equipment and terminal Download PDFInfo
- Publication number
- CN208445738U CN208445738U CN201821284839.2U CN201821284839U CN208445738U CN 208445738 U CN208445738 U CN 208445738U CN 201821284839 U CN201821284839 U CN 201821284839U CN 208445738 U CN208445738 U CN 208445738U
- Authority
- CN
- China
- Prior art keywords
- harmonic distortion
- audio signal
- filter
- capacitor
- resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 37
- 230000005236 sound signal Effects 0.000 claims abstract description 103
- 239000000284 extract Substances 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 45
- 230000004044 response Effects 0.000 claims description 16
- 210000003027 ear inner Anatomy 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000003321 amplification Effects 0.000 description 5
- 238000012938 design process Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- RXKGHZCQFXXWFQ-UHFFFAOYSA-N 4-ho-mipt Chemical compound C1=CC(O)=C2C(CCN(C)C(C)C)=CNC2=C1 RXKGHZCQFXXWFQ-UHFFFAOYSA-N 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
The utility model discloses a kind of harmonic distortion filtering equipments, are related to audio data processing technology field, for solving the harmonic distortion problems of existing terminal audio frequency output.It include: the MIC for picking up the audio signal of loudspeaker；It is connected with MIC output end, extracts the filter of the corresponding audio signal of each default harmonic distortion frequency range in audio signal；It is connected with the output end of filter, the corresponding audio signal of each default harmonic distortion frequency range is subjected to reverse phase and amplifies to obtain the see-saw circuit that harmonic distortion filters out audio signal；Wherein, loudspeaker is connected with the output end of see-saw circuit 300, plays output audio signal；Harmonic distortion is filtered out after audio signal is added to corresponding original audio signal by original channel and is formed by output audio signal；Which reduce harmonic distortion problems are caused due to the physical structure of terminal entirety in the prior art, the invention also discloses a kind of terminals, have above-mentioned beneficial effect.
Description
Technical field
The utility model relates to technical field of data processing, in particular to a kind of harmonic distortion filtering equipment and terminal.
Background technique
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 structure 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 by 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 as system.
Utility model content
The purpose of the utility model is to provide a kind of harmonic distortion filtering equipment and terminal, reduce in the prior art due to
The physical structure reason of terminal entirety causes harmonic distortion problems, improves user to the auditory effect of audio signal.
In order to solve the above technical problems, the utility model provides a kind of harmonic distortion filtering equipment, comprising:
Pick up the MIC of the audio signal of loudspeaker；
It is connected with the MIC output end, 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 loudspeaker is connected with the output end of the see-saw circuit 300, plays output audio signal；Institute
Stating output audio signal is that the harmonic distortion is filtered out to audio signal to be added to corresponding original audio letter by original channel
It is formed after number.
Optionally, the filter is R/C filter circuit.
Optionally, the R/C filter circuit includes first resistor to 3rd resistor, first capacitor to third capacitor；Wherein,
The first end of the first resistor is connected with the output end of the MIC, and second end is connected with the first end of the second resistance；Institute
The second end for stating second resistance is connected with the second end of the third capacitor；The first end of the third capacitor and third electricity
The first end of resistance is connected；The second end of the 3rd resistor is grounded；The first end of second capacitor and the first resistor
Second end is connected, the second end ground connection of second capacitor；The first of the first end of the first capacitor and the first resistor
End is connected, and second end is connected with the first end of the 3rd resistor.
Optionally, see-saw circuit is specially the first operational amplifier；Wherein, the negative sense of first operational amplifier
Input terminal is connected with the output end of the filter, and positive input ground connection, output end is connected with the original channel output end.
Optionally, the harmonic distortion filtering equipment further include:
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 to obtain the compensating filter of compensating audio signal according to original frequency response curve.
Optionally, the compensating filter includes: R/C filter circuit and the amplification that is connected with the R/C filter circuit
Circuit.
Optionally, the amplifying circuit is second operational amplifier；The R/C filter circuit includes the 4th resistance to the 6th
Resistance, the 4th capacitor to the 6th capacitor；Wherein,
The first end of 4th resistance described in the positive input of the second operational amplifier and the R/C filter circuit
It is connected, negative input ground connection, output end is connected with the original channel output end；
The second end of 4th resistance is connected with the first end of the 5th resistance；The second end of 5th resistance with
The second end of 6th capacitor is connected；The first end of 6th capacitor is connected with the first end of the 6th resistance；It is described
The second end of 6th resistance is grounded；The first end of 5th capacitor is connected with the second end of the 4th resistance, and the described 5th
The second end of capacitor is grounded；The first end of 4th capacitor is connected with the first end of the 4th resistance, second end with it is described
The first end of 6th resistance is connected.
The utility model also provides a kind of terminal, including harmonic distortion filtering equipment described above.
Optionally, the terminal is earphone, wherein the MIC is arranged in earphone ante-chamber.
Optionally, the MIC is specially to feed back ANC MIC or inner ear call MIC.
A kind of harmonic distortion filtering equipment provided by the utility model, comprising: pick up the audio signal of loudspeaker
MIC；It is connected with MIC output end, extracts the filter of the corresponding audio signal of each default harmonic distortion frequency range in audio signal；With
The output end of filter is connected, and the corresponding audio signal of each default harmonic distortion frequency range is carried out reverse phase and amplifies to obtain harmonic distortion
Filter out the see-saw circuit of audio signal；Wherein, loudspeaker is connected with the output end of see-saw circuit 300, plays output
Audio signal；Output audio signal is that harmonic distortion is filtered out audio signal to be added to corresponding original audio by original channel
It is formed after signal.
As it can be seen that the harmonic distortion filtering equipment carries out harmonic distortion filter by the audio signal that loudspeaker exports to terminal
It removes, since the audio signal of loudspeaker output is the final audio signal of terminal, that is, terminal system is filtered as a whole
Except harmonic distortion, reduce and cause harmonic distortion problems due to the physical structure of terminal entirety in the prior art, improves and use
Auditory effect of the family to audio signal；The invention also discloses a kind of terminals, have above-mentioned beneficial effect, no longer superfluous herein
It states.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is the structural block diagram of harmonic distortion filtering equipment provided by the utility model embodiment；
Fig. 2 is the THD schematic diagram of earphone provided by the utility model embodiment；
Fig. 3 is a kind of schematic diagram of R/C filter circuit provided by the utility model embodiment；
Fig. 4 is the structural block diagram of another harmonic distortion filtering equipment provided by the utility model embodiment；
Fig. 5 is the schematic diagram that position is arranged in MIC in earphone provided by the utility model embodiment.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
Referring to FIG. 1, Fig. 1 is the structural block diagram of harmonic distortion filtering equipment provided by the utility model embodiment；It should
Harmonic distortion filtering equipment may include:
Pick up the MIC100 of the audio signal of loudspeaker；
It is connected with MIC100 output end, 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 is subjected to reverse phase and is put
The see-saw circuit 300 that harmonic distortion filters out audio signal is obtained greatly；
Wherein, loudspeaker is connected with the output end of see-saw circuit 300, plays output 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.
Loudspeaker and original channel are the component inherently having in terminal.Harmonic distortion filtering equipment includes in the present embodiment
The connection relationship of original other component in all parts (MIC100, filter 200 and see-saw circuit 300) and terminal
As shown in Figure 1.The input terminal of MIC100 is used to pick up the audio signal of loudspeaker, 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 loudspeaker, i.e., the output end of see-saw circuit 300 by the audio signal of output export to
Final is exported audio output to loudspeaker by original channel by original channel.
Wherein, harmonic distortion is typically due to the reasons such as the physical structure of terminal and causes, and this kind of distortion frequency range distribution is stablized
And distortion is larger, influences hearing effect.And existing some equipment for reducing harmonic distortion are generally all just for some portion
Part carries out, but the presence of other component also still will cause a part of harmonic distortion phenomenon, therefore it can not achieve to end
End is whole to carry out filtering out for harmonic distortion.Since the audio signal of loudspeaker output is exactly that the terminal that can hear of user is finally defeated
Audio signal out, therefore the present embodiment is in order to solve problems in the prior art, thus to the audio signal of loudspeaker output into
Row harmonic distortion filters out processing, with realize terminal system is filtered out into harmonic distortion as a whole, reduce in the prior art due to
The physical structure reason of terminal entirety causes harmonic distortion problems, improves user to the auditory effect of audio signal.
Due to Terminal Design, for example, loudspeaker setting position etc. will 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 to will lead to the distortion that it is obtained higher for the difference of each terminal
Frequency range be not quite similar, corresponding obtained default harmonic distortion frequency range will not be identical.Further, since user is to harmonic distortion
Tolerance difference, even if will also result in same terminal, but finally the determining higher frequency range of distortion is different (because really
It is that the higher standard of distortion can be different that, which is determined, which can voluntarily be determined by user), and then corresponding default harmonic wave loses
Very frequency range identical (because determining that the selection for the frequency range that harmonic distortion generates can be different, such as will not choose 2 subharmonic and correspond to
Frequency, or choose 2 times and the corresponding frequency range of 3 subharmonic).Filter 200 and see-saw circuit 300 in the present embodiment
Quantity and default harmonic distortion frequency range quantity be adapted.User can determine mistake by the THD (total harmonic distortion) of terminal
Very higher frequency range, and then the frequency range that the corresponding major harmonic distortion of each frequency range can be concentrated is corresponding as the frequency range
Default harmonic distortion frequency range.I.e. user determines each default harmonic distortion frequency range according to the total harmonic distortion test result of terminal.
The process is illustrated by taking earphone as an example below, specifically please refers to Fig. 2.Due to loudspeaker monomer and earphone cavity
Design reasons, usual earphone can be higher in the distortion of certain frequency ranges, such as Fig. 2,20Hz-110Hz, 4000Hz-5000Hz.Product physics
After structure 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
The frequency range that harmonic distortion generates concentrates on 40-60Hz (main energetic of distortion concentrates on 2 times and 3 subharmonic).Therefore 20Hz pairs
The default harmonic distortion frequency range answered is 40Hz-60Hz.
The corresponding filter 200 of harmonic distortion frequency range is each preset in the present embodiment, there are several default harmonic distortion frequencies
Section will be corresponding with several filters 200.Such as when there are two default harmonic distortion frequency range 40Hz-60Hz and 1200Hz-
When 2400Hz, for tool there are two filter, 40Hz-60Hz corresponds to first filter, and 1200Hz-2400Hz corresponds to another filtering
Device.
Further, the type of the present embodiment not limiting filtering device 200, can be selected according to the actual conditions of terminal
It selects.Such as R/C filter circuit.The specifically tool of the corresponding filter circuit (such as R/C filter circuit) of each default harmonic distortion frequency range
The determination of body design process and component parameter can lose with reference to the design process of prior art filter and default harmonic wave
The actual demand of true frequency range.
When filter 200 is R/C filter circuit, design see-saw circuit 300 can be corresponded to.Wherein, each reverse phase
The specific design process of amplifying circuit 300 and the determination of component parameter can setting with reference to prior art see-saw circuit
The actual demand of meter process and default harmonic distortion frequency range.
It, will the corresponding audio signal input correspondence of each default harmonic distortion frequency range when filter 200 is R/C filter circuit
See-saw circuit obtain harmonic distortion and filter 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 carries out reverse phase and is enlarged to obtain final harmonic distortion to filter out audio signal.It is also possible to 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 in original channel, obtains final harmonic distortion and filters out audio
Signal.In order to guarantee the effect of harmonic carcellation distortion, corresponding reverse phase amplification can be designed for each default harmonic distortion frequency range
Each is preset the corresponding audio signal of harmonic distortion frequency range and is put using corresponding see-saw circuit progress reverse phase by circuit
The default corresponding harmonic distortion of harmonic distortion frequency range is obtained greatly filters out audio signal.It is corresponding that harmonic distortion frequency range will each be preset
Harmonic distortion filter out audio signal and summarized, obtain final harmonic distortion and filter out audio signal.
The present embodiment in the terminal in original original channel by the harmonic distortion for carrying out reverse phase filter out audio signal with
Audio signal can be filtered out by harmonic distortion after corresponding original audio signal superposition filters out corresponding original audio signal
In corresponding harmonic distortion signal, then realize removal original audio signal in harmonic distortion effect.It will be finally obtained
The audio signal for eliminating harmonic distortion is exported as output audio signal to loudspeaker, and what user heard at this time eliminates humorous
The auditory effect of user can be improved in the audio signal of wave distortion, promotes user to the usage experience of terminal.
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 will after extracting the music signal of 40-60Hz frequency range and being amplified its reverse phase by reverse amplification circuit
Fixed-bandwidth reverse phase audio signal (i.e. harmonic distortion filters out audio signal) is with corresponding original music signal in original channel
Loudspeaker i.e. loudspeaker are transferred to after superposition.
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 loudspeaking
Audio signal in device reduce the processing of harmonic distortion, and processing timeliness is more preferable.
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 circuit.The present embodiment is not to the specific of specific R/C filter circuit
Form is defined, and user can set with reference to the actual conditions of the R/C filter circuit of corresponding frequency band function in the prior art
It sets.Preferably, referring to FIG. 3, giving a kind of composition form of specific R/C filter circuit.R/C filter circuit includes first
Resistance R1, second resistance R2,3rd resistor R3, first capacitor C1, the second capacitor C2, third capacitor C3；Wherein, first resistor R1
First end be connected with the output end of MIC100, second end is connected with the first end of second resistance R2；The second of second resistance R2
End is connected with the second end of third capacitor C3；The first end of third capacitor C3 is connected with the first end of 3rd resistor R3；Third electricity
Hinder the second end ground connection of R3；The first end of second capacitor C2 is connected with the second end of first resistor R1, and the second of the second capacitor C2
End ground connection；The first end of first capacitor C1 is connected with the first end of first resistor R1, the first end of second end and 3rd resistor R3
It is connected.The numerical value of each capacitor and resistance in R/C filter circuit is not defined in the present embodiment, user can be according to end
The actual conditions at end and the R/C filter circuit actual functional capability 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, due to also can be right 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 original audio signal, for example, in above-described embodiment 20Hz harmonic distortion
It is attenuated, while the original music signal of 40-60Hz is also attenuated.For compensate original music signal decaying, in original signal
Compensating module is added in channel, makes up the music signal accidentally to be declined.Therefore in order to make up the original audio signal accidentally decayed, into one
Step improves user to the auditory effect of audio signal, can compensate to the original audio signal of accidentally decaying in the present embodiment.Please
With reference to Fig. 4, Fig. 4 is the structural block diagram of another harmonic distortion filtering equipment provided by the utility model embodiment；The harmonic wave loses
True filtering equipment further include:
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 to obtain the compensating filter 400 of compensating 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 circuit and with R/C filter circuit phase
Amplifying circuit even.The present embodiment is not defined the concrete form of specific R/C filter circuit, and user can be with reference to existing
There are the actual conditions of the R/C filter circuit 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.
The output of each compensating filter summarizes to original channel and does not carry out with other in original channel in the present embodiment
The remaining original audio signal of compensation is summarized to obtain compensating audio signal.The harmonic distortion that will carry out reverse phase filters out
It can realize that filtering out audio using harmonic distortion believes after audio signal and the corresponding compensating audio signal superposition compensated
Number corresponding harmonic distortion signal in corresponding original audio signal is filtered out, compensates for further through compensating audio signal and accidentally decayed
Original audio signal.Then it realizes and had not only removed harmonic distortion in original audio signal but also guaranteed that original audio signal is not declined
The effect subtracted.It exports finally obtained audio signal as output audio signal to loudspeaker, what user heard at this time both goes
In addition to harmonic distortion guarantees the audio signal that original audio signal is not attenuated again, the auditory effect of user can be improved, promoted
Usage experience of the user to terminal.
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 is illustrated, such as after earphone design phase early period determines acoustics scheme, obtains former by taking earphone as an example
Beginning frequency response curve P0, specifically, earphone is placed into human simulation (such as HATS) head in the case where filtering out without harmonic distortion
On, measure original frequency response curve P0.
The present embodiment by the process that original frequency response curve compensates to not being defined specifically.Optionally, divide
Corresponding original audio signal is not compensated to obtain compensating audio using the compensating filter of each default harmonic distortion frequency range
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 filters for tool, and corresponding first compensating filter of 40Hz-60Hz, 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 compensated by original audio signal of the compensation filter circuit to corresponding default harmonic distortion frequency range.Specifically
The specific design process and member of the corresponding compensation filter circuit (such as R/C compensation filter circuit) of each default harmonic distortion frequency range
The determination of device parameters can be with reference to the design process of prior art filter and the limitation of original frequency response curve.Wherein, exist
It is required that the corresponding compensating gain of final compensating filter, enables to corresponding default in compensating filter parameter determination process
Frequency response under harmonic distortion frequency range is as frequency response corresponding in original frequency response curve.Redesign compensating filter
During for each default harmonic distortion frequency range, adjust compensating gain numerical value, measure the frequency response P1 of terminal at this time,
Judge whether P1 is equal to P0, if then the compensating gain numerical value is compensating filter pair under the final default harmonic distortion frequency range
The compensating gain answered.If P1 not equal to compensating gain numerical value is adjusted when measuring P1=P0 if P0, fixed gain will be current
Compensating gain numerical value preset the corresponding compensating gain of compensating filter under harmonic distortion frequency range as this.
Further, in order to guarantee 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) when being compensation filter circuit in the circuit, naturally it is also possible to mend
It repays and individually increases an amplifying circuit except filter circuit.
Preferably, referring to FIG. 3, giving a kind of corresponding R/C compensation filter circuit of specific compensating filter 400
It can be referred to as the composition form of R/C compensation filter circuit (i.e. in the present embodiment in compensating filter 400 and filter 200
The composition of R/C filter circuit can be it is the same, such as Fig. 3).Amplifying circuit is second operational amplifier Q2；R/C filter circuit
Including the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 4th capacitor C4, the 5th capacitor C5, the 6th capacitor C6；Wherein,
The positive input of two operational amplifier Q2 is connected with the first end of the 4th resistance R4 in R/C filter circuit, and negative input connects
Ground, output end are connected with original channel output end；The second end of 4th resistance R4 is connected with the first end of the 5th resistance R5；5th
The second end of resistance R5 is connected with the second end of the 6th capacitor C6；The first end of 6th capacitor C6 and the first end of the 6th resistance R6
It is connected；The second end of 6th resistance R6 is grounded；The first end of 5th capacitor C5 is connected with the second end of the 4th resistance R4, the 5th electricity
Hold the second end ground connection of C5；The first end of 4th capacitor C4 is connected with the first end of the 4th resistance R4, second end and the 6th resistance
The first end of R6 is connected.The numerical value of each capacitor and resistance in R/C filter circuit is not defined in the present embodiment, user
It can be determined according to the actual conditions of terminal and the R/C filter circuit actual functional capability.Not to first in the present embodiment
Design parameter in operational amplifier Q2 is defined, and user can be determined according to the actual conditions of terminal.
In above-mentioned each embodiment when terminal needs multiple default harmonic distortion frequency ranges, it is only necessary in compensating filter two
End other the default corresponding compensating filter of harmonic distortion frequency range (other default corresponding benefits of harmonic distortion frequency range here in parallel
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 after each compensating filter parallel connection in original
In beginning channel), and in the output end both ends of loudspeaker (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 (for Fig. 1, that is, filter 200 and see-saw circuit 300
Concatenated branch).Here filter and reverse phase amplification electricity in other default corresponding series arms of harmonic distortion frequency range
It is specific that the composition on road is referred to filter and the composition of see-saw circuit in the series arm write out in above-described embodiment
Form is configured, and it is corresponding that user only needs to set filter and see-saw circuit in each series arm in advance
Then loudspeaker (SPK) input terminal, that is, original channel will be arranged in original channel after each series arm parallel connection in parameter
In (directly the setting of the output end of its see-saw circuit is existed if the harmonic distortion filtering equipment does not have compensating filter at this time
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.
Terminal provided by the embodiment of the utility model is introduced below, terminal described below with it is above-described humorous
Wave distortion filtering equipment can correspond to each other reference.
The utility model embodiment also provides a kind of terminal, filters out and sets including harmonic distortion described in above-mentioned any embodiment
It is standby.The terminal can be earphone either mobile phone etc..Preferably, when terminal is earphone, earphone is not carried out in the present embodiment
It limits, such as can be headphone, In-Ear Headphones, wireless headset etc..Wherein, MIC is arranged in earphone ante-chamber, specifically
Fig. 5 can be referred to.But specific location of the MIC in earphone ante-chamber is not limited in the present embodiment specifically.As horn hood is
The lid of loudspeaker, the positions such as Earcap supporter.
Based on the above embodiment, in order to improve the utilization efficiency of MIC in terminal, terminal cost, MIC in the present embodiment are reduced
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 loudspeaker.
A kind of harmonic distortion filtering equipment provided by the utility model and terminal are described in detail above.Herein
In apply specific case the principles of the present invention and embodiment be expounded, the explanation of above embodiments is only used
The method and its core concept of the utility model are understood in help.It should be pointed out that for those skilled in the art
For, without departing from the principle of this utility model, several improvements and modifications can be made to this utility model, these
Improvement and modification are also fallen into the protection scope of the utility model claims.
Claims (10)
1. a kind of harmonic distortion filtering equipment characterized by comprising
Pick up the MIC of the audio signal of loudspeaker；
It is connected with the MIC output end, 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 is subjected to reverse phase and is put
The see-saw circuit that harmonic distortion filters out audio signal is obtained greatly；
Wherein, the loudspeaker is connected with the output end of the see-saw circuit 300, plays output audio signal；It is described defeated
Audio signal is to filter out the harmonic distortion after audio signal is added to corresponding original audio signal by original channel out
It is formed.
2. harmonic distortion filtering equipment according to claim 1, which is characterized in that the filter is R/C filter circuit.
3. harmonic distortion filtering equipment according to claim 2, which is characterized in that the R/C filter circuit includes first
Resistance is to 3rd resistor, first capacitor to third capacitor；Wherein, the output end of the first end of the first resistor and the MIC
It is connected, second end is connected with the first end of the second resistance；The of the second end of the second resistance and the third capacitor
Two ends are connected；The first end of the third capacitor is connected with the first end of the 3rd resistor；The second end of the 3rd resistor
Ground connection；The first end of second capacitor is connected with the second end of the first resistor, the second end ground connection of second capacitor；
The first end of the first capacitor is connected with the first end of the first resistor, the first end phase of second end and the 3rd resistor
Even.
4. harmonic distortion filtering equipment according to claim 1, which is characterized in that see-saw circuit is specially the first fortune
Calculate amplifier；Wherein, the negative input of first operational amplifier is connected with the output end of the filter, forward direction input
End ground connection, output end are connected with the original channel output end.
5. harmonic distortion filtering equipment according to claim 1-4, 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 to obtain the compensating filter of compensating audio signal according to original frequency response curve.
6. harmonic distortion filtering equipment according to claim 5, which is characterized in that the compensating filter includes: R/C filter
Wave circuit and the amplifying circuit being connected with the R/C filter circuit.
7. harmonic distortion filtering equipment according to claim 6, which is characterized in that the amplifying circuit is that the second operation is put
Big device；The R/C filter circuit includes the 4th resistance to the 6th resistance, the 4th capacitor to the 6th capacitor；Wherein,
The first end phase of the positive input of the second operational amplifier and the 4th resistance described in the R/C filter circuit
Even, negative input ground connection, output end are connected with the original channel output end；
The second end of 4th resistance is connected with the first end of the 5th resistance；The second end of 5th resistance with it is described
The second end of 6th capacitor is connected；The first end of 6th capacitor is connected with the first end of the 6th resistance；Described 6th
The second end of resistance is grounded；The first end of 5th capacitor is connected with the second end of the 4th resistance, the 5th capacitor
Second end ground connection；The first end of 4th capacitor is connected with the first end of the 4th resistance, second end and the described 6th
The first end of resistance is connected.
8. a kind of terminal, which is characterized in that including the described in any item harmonic distortion filtering equipments of claim 1-7.
9. terminal according to claim 8, which is characterized in that the terminal is earphone, wherein the MIC is arranged in ear
In machine ante-chamber.
10. terminal according to claim 9, which is characterized in that the MIC is specially to feed back ANCMIC or inner ear call
MIC。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821284839.2U CN208445738U (en) | 2018-08-09 | 2018-08-09 | A kind of harmonic distortion filtering equipment and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821284839.2U CN208445738U (en) | 2018-08-09 | 2018-08-09 | A kind of harmonic distortion filtering equipment and terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208445738U true CN208445738U (en) | 2019-01-29 |
Family
ID=65086082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821284839.2U Withdrawn - After Issue CN208445738U (en) | 2018-08-09 | 2018-08-09 | A kind of harmonic distortion filtering equipment and terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208445738U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108600915A (en) * | 2018-08-09 | 2018-09-28 | 歌尔科技有限公司 | A kind of method, apparatus of audio output, harmonic distortion filtering equipment and terminal |
| CN110444893A (en) * | 2019-08-16 | 2019-11-12 | 歌尔科技有限公司 | A kind of unipole antenna bandwidth adjusting method and system |
| CN112213620A (en) * | 2020-09-21 | 2021-01-12 | 英彼森半导体(珠海)有限公司 | Harmonic distortion test circuit of communication device |
-
2018
- 2018-08-09 CN CN201821284839.2U patent/CN208445738U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108600915A (en) * | 2018-08-09 | 2018-09-28 | 歌尔科技有限公司 | A kind of method, apparatus of audio output, harmonic distortion filtering equipment and terminal |
| CN108600915B (en) * | 2018-08-09 | 2024-02-06 | 歌尔科技有限公司 | Audio output method and device, harmonic distortion filtering equipment and terminal |
| CN110444893A (en) * | 2019-08-16 | 2019-11-12 | 歌尔科技有限公司 | A kind of unipole antenna bandwidth adjusting method and system |
| CN112213620A (en) * | 2020-09-21 | 2021-01-12 | 英彼森半导体(珠海)有限公司 | Harmonic distortion test circuit of communication device |
| CN112213620B (en) * | 2020-09-21 | 2024-01-09 | 英彼森半导体(珠海)有限公司 | Harmonic distortion test circuit of communication device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208445738U (en) | A kind of harmonic distortion filtering equipment and terminal | |
| CN203761556U (en) | Double-microphone noise reduction earphone | |
| EP2712207A1 (en) | Audio signal broadcasting system and electronic apparatus | |
| CN108401204B (en) | Novel active noise reduction earphone | |
| CN108600915A (en) | A kind of method, apparatus of audio output, harmonic distortion filtering equipment and terminal | |
| CN203482389U (en) | Piezoelectric loudspeaker driving device | |
| CN110018808A (en) | A kind of sound quality adjusting method and device | |
| CN201054780Y (en) | Automatic noise reduction earphone | |
| CN103297894A (en) | Earphone power amplifier, working method and mobile terminal equipment | |
| US20130028437A1 (en) | Earphone device with impedance correction unit | |
| CN104581515B (en) | A kind of audio playing apparatus, method and mobile terminal | |
| CN111193983A (en) | Earphone sound coding regulation and control device and application method thereof | |
| CN207820219U (en) | A kind of audio output device | |
| CN102421049A (en) | Audio signal processing system and audiometric curve adjustment unit thereof | |
| CN106658255A (en) | Filter circuit for noise reduction headset | |
| CN205195930U (en) | Headset | |
| CN206283671U (en) | Professional audio electroacoustical measurement power amplifier | |
| CN207692002U (en) | Earphone | |
| CN102576560A (en) | Electronic audio device | |
| CN205195931U (en) | Headset | |
| CN107889006A (en) | A kind of active noise reduction system of flexible modulation de-noising signal delay | |
| CN209627697U (en) | A kind of hearing aid device system of cardinar number structured | |
| CN202111843U (en) | Sound for suppressing TDMA noises | |
| CN205071296U (en) | Audio amplifier frequency dividing circuit | |
| CN211240070U (en) | Audio power amplifier switching circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190129 Effective date of abandoning: 20240206 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20190129 Effective date of abandoning: 20240206 |