CN206100375U - Have treatment circuit and earphone of monitor and active noise reduction function concurrently - Google Patents
Have treatment circuit and earphone of monitor and active noise reduction function concurrently Download PDFInfo
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- CN206100375U CN206100375U CN201620868266.2U CN201620868266U CN206100375U CN 206100375 U CN206100375 U CN 206100375U CN 201620868266 U CN201620868266 U CN 201620868266U CN 206100375 U CN206100375 U CN 206100375U
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Abstract
The utility model discloses a have treatment circuit and earphone of monitor and active noise reduction function concurrently, it falls the unit of making an uproar, drive unit and supply control switch including feedforward microphone wiring end, speaker wiring end, active high -pass filtering unit, double T filtering unit, feedforward, feedforward microphone wiring end falls make an uproar unit and drive unit through active high -pass filtering unit, double T filtering unit, feedforward in order and holds with the speaker wiring and be connected, the feedforward is fallen and is connected with the supply control switch on each operational amplifier's of the unit of making an uproar the power supply loop, and the treatment circuit is set up as that it moves and fall the function of making an uproar to carry donator when each supply control the switch to provide the monitor function when each supply control switch disconnection. This earphone is including feedforward microphone, speaker and above -mentioned treatment circuit. The utility model discloses treatment circuit and earphone utilize the components and parts of active noise reduction circuit to realize the monitoring circuit, and then have controlled the cost of difunctional earphone to the reliability of difunctional earphone has been improved.
Description
Technical field
The utility model is related to sound signal processing technical field, more specifically, the utility model is related to one kind has prison concurrently
Listen and the process circuit of active noise reduction function and a kind of earphone for having monitoring and active noise reduction function concurrently.
Background technology
With the continuous development of electronic product consumption market, increasing people listen to high using earphone in daily life
The music of quality.However, the noise pollution in city is increasingly severe, in outdoor application common headphones earplug, volume can only be improved
To cover noise, beautiful music so can not be not only enjoyed, the hearing of oneself is also had a great impact, therefore, just
Occur in that noise cancelling headphone.
In noise cancelling headphone field, passive type noise control (Passive Noise Control, PNC) and active noise
Control (Active Noise Control, ANC) is current topmost two kinds of noise cancellations.Wherein, the principle of PNC is
Using external hard plastic material and the packing material of inside, to isolate and absorb noise, and then stop that extraneous noise enters ear；
And the principle of ANC is to use a set of noise reduction control process circuit, the noise phase place for carrying out adaptability computing to export and to be eliminated
Conversely, frequency and energy identical sound wave, to reach the purpose of noise reduction.
Current earphone active noise reduction techniques mainly have feed forward type and reaction type two ways.It is front in feed forward type system
Feedback microphone is located at earphone outside or earphone cover opening, directly to gather the noise signal outside earphone, through ANC process electricity
Lu Hou, promotes loudspeaker to export inverse noise to offset into the noise inside earmuff, and its topmost feature is the elimination of noise
Loop is open loop；And in reaction type system, microphone be located at earphone inside loudspeaker above or near, microphone gathers ear
Noise signal inside cover, then through the close loop negative feedback loop of ANC circuit composition, promote loudspeaker to produce inverse noise to offset
Noise inside earmuff.
As can be seen here, active noise reduction is to promote loudspeaker to produce the technology that inverse noise further realizes noise cancellation.And monitor
Function is then to promote loudspeaker to export the playback sound highly similar to original sound, allows the user to hear closest true
Real, tonequality that is not adding any modification.Because two functions have different requirements, therefore, be on earphone while time master
Dynamic decrease of noise functions and monitor function, current way is to arrange separate noise reduction filtering circuit and monitoring filter circuit.By
In this two kinds of filter circuits typically using the active filter circuit being made up of amplifier, and at active filter circuit operational amplifier it
Outward, in addition it is also necessary to configure the components and parts such as resistance, electric capacity and power pack, therefore, realize simultaneously on a earphone active noise reduction and
Monitor function will cause whole machine components and parts cost to increase and the volume of printed circuit board increases, and increased components and parts can also lead
Cause whole aircraft reliability to reduce, which limits the popularization and application of the earphone for having this two kinds of functions concurrently.
Utility model content
A purpose of the present utility model is to provide a kind of components and parts of utilization active noise reduction circuit and realizes monitoring circuit
New technical scheme.
According to first aspect of the present utility model, there is provided a kind of to have the process circuit monitored with active noise reduction function concurrently,
It includes feedforward microphone terminals, loudspeaker wiring end, active high pass filter unit, double-t filter unit, feed forward noise reduction list
Unit, driver element and power control switch；The feedforward microphone terminals sequentially active high pass filter unit described in Jing, described
The connection corresponding with the loudspeaker wiring end of double-t filter unit, the feed forward noise reduction unit and the driver element；The feedforward
The power control switch is connected with the current supply circuit of each operational amplifier of noise reduction unit, the process circuit is set
To provide active noise reduction function when each power control switch connects corresponding current supply circuit, and in each power supply
Controlling switch provides monitor function when disconnecting corresponding current supply circuit.
Optionally, each resistance of the double-t filter unit include basic resistance and with the basic resistor coupled in parallel
The resistors match unit of connection, the resistors match unit includes build-out resistor and the resistors match controlling switch being connected in series；
The process circuit is arranged to provide active noise reduction function when each resistors match controlling switch disconnects, and each
The resistors match controlling switch provides monitor function when connecting.
Optionally, each resistance and each electric capacity of the double-t filter unit is arranged under active noise reduction function
With symmetric double T filter structure is constituted under monitor function.
Optionally, the frequency that the double-t filter unit is arranged to be selected under monitor function is 10KHZ.
Optionally, each electric capacity of the double-t filter unit include basic electric capacity and with the basic capacitances in series
The electric capacity matching unit of connection, the electric capacity matching unit includes the matching capacitance being connected in parallel and electric capacity match control switch,
The process circuit is arranged to provide active noise reduction function in each electric capacity match control switch connection, and each
The electric capacity match control provides monitor function when switching off.
Optionally, the feed forward noise reduction unit include the first operational amplifier, the second operational amplifier, the first electric capacity,
5th electric capacity, the 6th electric capacity, first resistor, the 4th resistance, the 7th resistance, the 8th resistance and the 9th resistance；
The inverting input of first operational amplifier via the 8th resistance and the double-t filter unit output
End connection, in-phase input end ground connection；9th resistance and described first described in the inverting input Jing of second operational amplifier
The output end connection of operational amplifier, in-phase input end ground connection；The output end of second operational amplifier drives list with described
The input connection of unit；
The cascaded structure of the first resistor and first electric capacity, the 4th resistance and the 5th electric capacity are in parallel
It is connected between the output end of the inverting input of first operational amplifier and first operational amplifier；
7th resistance and the 6th electric capacity be connected in parallel the inverting input of second operational amplifier with
Between the output end of second operational amplifier.
Optionally, the driver element is anti-phase proportional amplifier.
According to second aspect of the present utility model, there is provided a kind of to have the earphone monitored with active noise reduction function concurrently, its bag
Include：
Feedforward microphone, for gathering the voice signal outside earphone；
Process circuit according to the utility model first aspect, via feedforward microphone terminals the sound is received
Signal, and export the voice signal that Jing is processed via loudspeaker wiring end；And,
Loudspeaker, for according to the voice signal sounding.
Optionally, the earphone is provided with mode selector switch and controller, and the mode selector switch is arranged to
Noise reduction is exported by itself two kinds of on off states to the controller respectively enable signal and monitoring enable signal；
The controller is arranged to enable the on off state that signal controls all controlling switches according to the noise reduction, so that
The process circuit provides decrease of noise functions；
The controller is also configured to enable the on off state that signal controls all controlling switches according to described monitoring, with
The process circuit is set to provide monitor function.
Optionally, the process circuit provides all of controlling switch by single-pole single-throw(SPST analog switch chip.
Inventor's discovery of the present utility model, in the prior art, if it is desired to which a earphone has active noise reduction work(
Can, and with monitor function, then need to be respectively provided with separate active noise reduction circuit and monitoring circuit, and then there is cost
The problem that increase, the increase of printed circuit plate bulk and whole aircraft reliability are reduced.Therefore, the technology to be realized of the utility model is appointed
Business either technical problem to be solved be it is that those skilled in the art never expect or it is not expected that, therefore this practicality is newly
Type is a kind of new technical scheme.
A beneficial effect of the present utility model is that the utility model process circuit is using the portion of active noise reduction circuit
Components and parts (removing the components and parts outside the operational amplifier of feed forward noise reduction unit) are divided to realize monitoring circuit, therefore, it is possible to
The use of components and parts is effectively reduced, and then with effective control cost and the volume of printed circuit board, and incipient fault point can be reduced,
Improve whole aircraft reliability.
By referring to the drawings to the detailed description of exemplary embodiment of the present utility model, it is of the present utility model other
Feature and its advantage will be made apparent from.
Description of the drawings
It is combined in the description and the accompanying drawing of the part that constitutes specification shows embodiment of the present utility model, and
And be used to explain principle of the present utility model together with its explanation.
Fig. 1 is a kind of frame principle figure of the embodiment according to the utility model process circuit；
Fig. 2 is a kind of circuit theory diagrams of embodiment of process circuit shown in Fig. 1；
Fig. 3 is the circuit theory diagrams of another kind of embodiment of double-t filter unit in Fig. 2；
Fig. 4 is the circuit theory diagrams of the third embodiment of double-t filter unit in Fig. 2.
Description of reference numerals：
100：Process circuit； MIC：Feedforward microphone；
SPK：Loudspeaker； U1：Active high pass filter unit；
U2：Double-t filter unit； U3：Feed forward noise reduction unit；
U4：Driver element； U301：First operational amplifier；
U302：Second operational amplifier； R8：8th resistance；
R1：First resistor； R4：4th resistance；
R2：Second resistance； R9：9th resistance；
C1：First electric capacity； C5：5th electric capacity；
C6：6th electric capacity； VPOS：Positive supply terminals；
VNEG：Negative supply terminals； K3：Power control switch；
R3、R5-R7、R10-R13：Resistance； C2-C4、C7：Electric capacity；
U101、U401：Operational amplifier； R31、R61、R71：Basic resistance；
R32、R62、R72：Build-out resistor； KR2：Resistors match controlling switch；
C31、C41、C71：Basic electric capacity； C32、C42、C72：Matching capacitance；
KC2：Electric capacity match control is switched.
Specific embodiment
Describe various exemplary embodiments of the present utility model in detail now with reference to accompanying drawing.It should be noted that：Unless another
Illustrate outward, the part and the positioned opposite of step, numerical expression and numerical value for otherwise illustrating in these embodiments is not limited
Make scope of the present utility model.
It is below illustrative to the description only actually of at least one exemplary embodiment, never as to this practicality
New and its application or any restriction for using.
For technology, method and apparatus may be not discussed in detail known to person of ordinary skill in the relevant, but suitable
In the case of, the technology, method and apparatus should be considered a part for specification.
In all examples shown here and discussion, any occurrence should be construed as merely exemplary, and not
It is as restriction.Therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it need not be further discussed in subsequent accompanying drawing.
The utility model causes cost to increase to solve the separate active noise reduction circuit of setting and monitoring circuit, print
The problem that circuit board volume increase processed and whole aircraft reliability are reduced, there is provided a kind of to have the place monitored with active noise reduction function concurrently
Reason circuit, the process circuit specifically realizes monitoring circuit using the components and parts of active noise reduction circuit, and then effectively solving is above-mentioned
Problem.
Fig. 1 is a kind of frame principle figure of the embodiment according to the utility model process circuit.
According to Fig. 1, the agent structure of the process circuit is feed forward type active noise reduction circuit, feed forward type active noise reduction
Circuit includes feedforward microphone terminals Jin+, Jin-, loudspeaker wiring end Jout+, Jout-, active high-pass filtering list substantially
First U1, double-t filter unit U2, feed forward noise reduction unit U3, and driver element U4, feedforward microphone terminals Jin+, Jin- are sequentially
Active high pass filter units U1 of Jing, double-t filter unit U2, feed forward noise reduction unit U3 and driver element U4 and loudspeaker wiring end
Jout+, Jout- correspondence connects, wherein, the feedforward microphone terminals Jin- and loudspeaker wiring end Jout- is grounded, therefore,
Active high pass filter unit U1, double-t filter unit U2, the earth point of feed forward noise reduction unit U3 and driver element U4 become correspondence
One signal input output end of unit, the input of each unit for below illustrating, output end refer specifically to ungrounded one end.
Above-mentioned active high pass filter unit U1 can adopt single order high-pass filtering, it would however also be possible to employ the high pass filter of higher order
Ripple, the voice signal for collecting to feedforward microphone MIC carries out high-pass filtering process, in addition, its be generally also provided with it is preposition
Amplification, to be amplified process to the signal for passing through.
Above-mentioned double-t filter unit U2 is used to realize frequency-selecting and phase compensation.
Above-mentioned feed forward noise reduction unit U3 is used to carry out feed forward type noise reduction process, and it is substantially by operational amplifier, electric capacity and electricity
Resistance composition.
Above-mentioned driver element U4 is used for drive the speaker SPK sounding.
The utility model process circuit is by increasing power supply control on the basis of above-mentioned feed forward type active noise reduction circuit
Switch K3 realizes monitoring circuit, specially：The connection on the current supply circuit of each operational amplifier of feed forward noise reduction unit U3 is supplied
Electric control switch K3, to close the operational amplifier of feed forward noise reduction unit U3 when power control switch K3 disconnects, and then only leads to
The passive filter circuit being made up of resistance, electric capacity for crossing feed forward noise reduction unit U3 provides signal path, realizes monitor function, i.e., originally
Utility model process circuit is arranged to provide active noise reduction when each power control switch K3 connects corresponding current supply circuit
Function, and monitor function is provided when each power control switch K3 disconnects corresponding current supply circuit, which achieves using front
The components and parts of feedback formula active noise reduction circuit realize the purpose of monitoring circuit.
Above-mentioned power control switch K3 can be the toggle switch of manual control, so that user passes through toggle switch actively
Switch between noise reduction mode and listening mode.Above-mentioned power control switch K3 can also be electronic switch, so that user passes through mould
The signal of the on off state of formula switching switch triggering control power control switch K3.
Fig. 2 is a kind of circuit theory diagrams of embodiment of process circuit shown in Fig. 1.
According to Fig. 2, above-mentioned feed forward noise reduction unit U3 can include the first operational amplifier U301, the second operation amplifier
Device U302, the first electric capacity C1, the 5th electric capacity C5, the 6th electric capacity C6, first resistor R1, the 4th resistance R4, the 7th resistance R7, the 8th
Resistance R8 and the 9th resistance R9.The resistance R8 of inverting input Jing the 8th and double-t filter unit U2 of the first operational amplifier U301
Output end connection, in-phase input end ground connection；The resistance R9 of inverting input Jing the 9th and first of the second operational amplifier U302
The output end connection of operational amplifier U301, in-phase input end ground connection；The output end of the second operational amplifier U302 is single with driving
The input connection of first U4.The cascaded structure of first resistor R1 and the first electric capacity C1, the 4th resistance R4 and the 5th electric capacity C5 are in parallel
It is connected between the output end of the inverting input of the first operational amplifier U301 and the first operational amplifier U301.7th resistance
R7 and the 6th electric capacity C6 are connected in the inverting input of the second operational amplifier U302 and the second operational amplifier U302's in parallel
Between output end.
For the structure of the feed forward noise reduction unit U3 shown in Fig. 2, it should in the current supply circuit of the first operational amplifier U301
Upper connection power control switch K3, and connect power control switch K3 on the current supply circuit of the second operational amplifier U302.
For the first operational amplifier U301 shown in Fig. 2 is using the structure of dual power supply, can be in positive supply wiring
Between end VPOS and the positive supply input of the first operational amplifier U301, and put with the first computing in negative supply terminals VNEG
Respectively connect a power control switch K3 between the negative supply input of big device U301, and then realize to the first operational amplifier
The power supply control of U301.
For the second operational amplifier U302 shown in Fig. 2 is using the structure of dual power supply, can be in positive supply wiring
Between end VPOS and the positive supply input of the second operational amplifier U302, and put with the second computing in negative supply terminals VNEG
Respectively connect a power control switch K3 between the negative supply input of big device U302, and then realize to the second operational amplifier
The power supply control of U302.
And feed forward noise reduction unit U3 operational amplifier powered using single supply structure when, can be in positive supply wiring
Between end and the positive supply input of this operational amplifier, and/or connect one between ground wire and the earth terminal of this operational amplifier
Individual power control switch K3, and then realize the power supply control to this operational amplifier.
So, disconnect on corresponding current supply circuit, outside the earphone that feedforward microphone MIC is collected in power control switch K3
The voice signal in portion by sequentially through active high pass filter unit U1, double-t filter unit U2, feed forward noise reduction unit U3 by resistance
Drive the speaker SPK sounding after the process of the passive filter circuit and driver element U4 that constitute with electric capacity, and then export and ear
The highly similar playback sound of sound outside machine, realizes monitor function.
According to Fig. 2, above-mentioned active high pass filter unit U1 may include operational amplifier U101, electric capacity C2, resistance R5,
Resistance R12 and resistance R13, wherein, the homophase input of feedforward microphone terminals Jin+ Jing electric capacity C2 and operational amplifier U101
End connection, and the in-phase input end Jing resistance R5 ground connection of operational amplifier U101；The output end Jing resistance of operational amplifier U101
The cascaded structure ground connection of R12 and resistance R13, and the potential point between resistance R12 and resistance R13 is connected to operational amplifier U101
Inverting input, with filtering while realize signal amplify.
According to Fig. 2, above-mentioned double-t filter unit U2 include resistance R3, resistance R6, resistance R7, electric capacity C3, electric capacity C4 and
Electric capacity C7, wherein, electric capacity C3 is connected between the first end of the output end of active high pass filter unit U1 and resistance R3, electric capacity C4
It is connected between the input of feed forward noise reduction unit U3 and the first end of resistance R3, and second end of resistance R3 is grounded；Resistance R6
It is connected between the first end of the output end of active high pass filter unit U1 and electric capacity C7, resistance R7 is connected to feed forward noise reduction unit
Between the input of U3 and the first end of electric capacity C7, and second end of electric capacity C7 is grounded.
Above-mentioned driver element U4 can adopt anti-phase proportional amplifier, specifically, anti-phase scaling according to Fig. 2
Device includes operational amplifier U401, resistance R10 and resistance R11, wherein, the inverting input Jing resistance of operational amplifier U401
R10 is connected with the output end of feed forward noise reduction unit U3, in-phase input end ground connection, the inverting input also Jing of operational amplifier U401
Resistance R11 is connected with the output end of operational amplifier U401, and the output end of operational amplifier U401 is driver element U4
Output end, and then be connected with loudspeaker wiring end Jout+.
For due to the relative active noise reduction function of monitor function, in order to realize the more highly similar playback of sound, can
There is relatively wide passband to arrange monitoring circuit, for this purpose, the frequency that double-t filter unit U2 is selected under monitor function can be made
(the corresponding Frequency point of trap) is bigger, for example, cause the frequency that double-t filter unit U2 is selected under monitor function to be 10KHZ, this
Place is interpreted as the error allowed band for having within ± 1KHz.
In order to realize the purpose of above-mentioned extension monitoring circuit passband, Fig. 3 shows that one kind of double-t filter unit U2 is real
The circuit theory diagrams of example are applied, the embodiment realizes prison especially by the resistance of resistance R3, R6, the R7 for reducing double-t filter unit U2
Circuit is listened with the extension of frequency band.
According to Fig. 3, each resistance R3, R6, R7 of double-t filter unit U2 include basic resistance and with it is basic
The resistors match unit of resistor coupled in parallel connection, and resistors match unit further includes the build-out resistor being connected in series and resistance
With controlling switch.Specifically, resistance R3 includes basic resistance R31, the resistors match unit of resistance R3 include being connected in series
With resistance R32 and resistors match controlling switch KR2；Resistance R6 includes basic resistance R61, and the resistors match unit of resistance R6 includes
Build-out resistor R62 being connected in series and resistors match controlling switch KR2；Resistance R7 includes basic resistance R71, the resistance of resistance R7
Matching unit includes build-out resistor R72 and resistors match controlling switch KR2 being connected in series.On this basis, the utility model
Process circuit is arranged to provide active noise reduction function when each resistors match controlling switch KR2 disconnects, and in each resistance
Match control switch KR2 provides monitor function when connecting.
Above-mentioned resistors match controlling switch KR2 can be the toggle switch of manual control, or be believed by switch control rule
Number control electronic switch.
Fig. 4 shows the circuit theory diagrams of another kind of embodiment of double-t filter unit U2, and the embodiment is especially by reduction
The capacitance of electric capacity C3, C4, C7 of double-t filter unit U2 realizes extension of the monitoring circuit with frequency band.
According to Fig. 4, each electric capacity C3, C4, C7 of the double-t filter unit include basic electric capacity and with basic electric capacity
The electric capacity matching unit being connected in series, and the electric capacity matching unit further includes the matching capacitance being connected in parallel and electric capacity matching
Controlling switch KC2.Specifically, electric capacity C3 includes basic electric capacity C31, the electric capacity matching unit of electric capacity C3 include being connected in parallel
With electric capacity C32 and electric capacity match control switch KC2；Electric capacity C4 includes basic electric capacity C41, and the electric capacity matching unit of electric capacity C4 includes
Matching capacitance C42 being connected in parallel and electric capacity match control switch KC2；Electric capacity C7 includes basic electric capacity C71, the electric capacity of electric capacity C7
Matching unit includes matching capacitance C72 being connected in parallel and electric capacity match control switch KC2.On this basis, the utility model
Process circuit is arranged to provide active noise reduction function when each electric capacity match control switch KC2 is connected, and in each electric capacity
Match control switch KC2 provides monitor function when disconnecting.
Above-mentioned electric capacity match control switch KC2 can be the toggle switch of manual control, or be believed by switch control rule
Number control electronic switch.
Alternatively, it is also possible to pass through the resistance and each electric capacity of each resistance R3, R6, R7 of reduction double-t filter unit simultaneously
The mode of the capacitance of C3, C4, C7 realizes extension of the monitoring circuit with frequency band, i.e., with reference to Fig. 3 and embodiment illustrated in fig. 4, here
Repeat no more.
Each resistance R3, R6, R7 and each electric capacity C3, C4, C7 of above-mentioned double-t filter unit U2 is arranged to be dropped in active
Symmetric double T filter structure is constituted under function of making an uproar and monitor function.Can also be each resistance of above-mentioned double-t filter unit U2
R3, R6, R7 and each electric capacity C3, C4, C7 are arranged to constitute symmetric double T filter structure under active noise reduction function, and in prison
Asymmetric double T filter structure is constituted under auditory function, and frequency is also significantly attenuated more than the signal of selected frequency.
On the basis of above-mentioned process circuit 100, the utility model additionally provides one kind and has monitoring and active noise reduction work(concurrently
The earphone of energy, with reference to shown in Fig. 2, the earphone includes feedforward microphone MIC, process circuit 100 and loudspeaker SPK, wherein, before this
Feedback microphone MIC is used to gather the voice signal outside earphone, and it can be arranged at earphone outside or earphone cover opening；At this
The voice signal that reason circuit 100 is collected via feedforward microphone terminals Jin+, Jin-, and via loudspeaker wiring end
The voice signal that Jout+, Jout- output Jing is processed；Loudspeaker SPK is used for according to voice signal sounding, with active noise reduction
The inverse noise for offsetting the noise inside earmuff is exported under function, and the sound for listening to is exported under monitor function.
Cutting between active noise reduction function and monitor function is carried out by unified mode selector switch for the ease of user
Change, the earphone is also provided with mode selector switch and controller, mode selector switch is arranged by itself two kinds
On off state (i.e. on-state and off-state) enables signal and monitors and enables signal to controller output noise reduction respectively.Control
Device is then arranged to enable signal according to noise reduction and controls all controlling switches and (including power control switch K3 and may arrange
Resistors match controlling switch KR2 and/or electric capacity match control switch KC2) on off state so that process circuit 100 provide drop
Make an uproar function, and be arranged to enable the on off state that signal controls all controlling switches according to monitoring, so that process circuit 100 is carried
For monitor function.
The process circuit 100 can provide all of control and open by one or more single-pole single-throw(SPST analog switch chip
Close, to improve the degree of integration of process circuit 100.
The various embodiments described above primary focus describe the difference with other embodiment, identical similar between each embodiment
Part cross-reference.
Although being described in detail to some specific embodiments of the present utility model by example, this area
It is to be understood by the skilled artisans that example above is merely to illustrate, rather than in order to limit scope of the present utility model.This
Field it is to be understood by the skilled artisans that can be in the case of without departing from scope and spirit of the present utility model, to above example
Modify.Scope of the present utility model is defined by the following claims.
Claims (10)
1. it is a kind of to have the process circuit (100) monitored with active noise reduction function concurrently, it is characterised in that including feedforward microphone wiring
End (Jin+, Jin-), loudspeaker wiring end (Jout+, Jout-), active high pass filter unit (U1), double-t filter unit (U2),
Feed forward noise reduction unit (U3), driver element (U4) and power control switch (K3)；The feedforward microphone terminals (Jin+,
Jin-) sequentially active high pass filter unit (U1), the double-t filter unit (U2), the feed forward noise reduction unit (U3) described in Jing
Connection corresponding with the loudspeaker wiring end (Jout+, Jout-) with the driver element (U4)；The feed forward noise reduction unit
(U3) power control switch (K3), the place are connected with the current supply circuit of each operational amplifier (U301, U302)
Reason circuit is arranged to provide active noise reduction function when each power control switch (K3) connects corresponding current supply circuit,
And provide monitor function when each power control switch (K3) disconnects corresponding current supply circuit.
2. process circuit (100) according to claim 1, it is characterised in that each electricity of the double-t filter unit (U2)
Resistance (R3, R6, R7) includes basic resistance (R31, R61, R71) and is connected in parallel with the basic resistance (R31, R61, R71)
Resistors match unit, the resistors match unit includes the build-out resistor (R32, R62, R72) that is connected in series and resistors match
Controlling switch (KR2)；The process circuit is arranged to provide master when each resistors match controlling switch (KR2) disconnects
Dynamic decrease of noise functions, and provide monitor function when each resistors match controlling switch (KR2) is connected.
3. process circuit (100) according to claim 2, it is characterised in that each electricity of the double-t filter unit (U2)
Resistance (R3, R6, R7) and each electric capacity (C3, C4, C7) be arranged under active noise reduction function with monitor function under constitute it is right
Claim double-t filter structure.
4. process circuit (100) according to claim 2, it is characterised in that the double-t filter unit is arranged in prison
The frequency selected under auditory function is 10KHZ.
5. process circuit (100) according to any one of claim 1 to 4, it is characterised in that the double-t filter unit
(U2) each electric capacity (C3, C4, C7) include basic electric capacity (C31, C41, C71) and with the basic electric capacity (C31, C41,
C71 the electric capacity matching unit) being connected in series, the electric capacity matching unit include be connected in parallel matching capacitance (C32, C42,
C72) and electric capacity match control switch (KC2), the process circuit is arranged to be switched in each electric capacity match control
(KC2) active noise reduction function is provided when connecting, and work(is monitored in offer when each electric capacity match control switch (KC2) disconnects
Energy.
6. process circuit (100) according to claim 1, it is characterised in that the feed forward noise reduction unit (U3) includes the
One operational amplifier (U301), the second operational amplifier (U302), the first electric capacity (C1), the 5th electric capacity (C5), the 6th electric capacity
(C6), first resistor (R1), the 4th resistance (R4), the 7th resistance (R7), the 8th resistance (R8) and the 9th resistance (R9)；
The inverting input of first operational amplifier (U301) is via the 8th resistance (R8) and the double-t filter unit
(U2) output end connection, in-phase input end ground connection；Described in the inverting input Jing of second operational amplifier (U302)
Nine resistance (R9) are connected with the output end of first operational amplifier (U301), in-phase input end ground connection；Second computing
The output end of amplifier (U302) is connected with the input of the driver element (U4)；
The cascaded structure of the first resistor (R1) and first electric capacity (C1), the 4th resistance (R4) and the described 5th
Electric capacity (C5) is connected in the inverting input and first operational amplifier of first operational amplifier (U301) in parallel
(U301) between output end；
7th resistance (R7) is connected in the anti-of second operational amplifier (U302) in parallel with the 6th electric capacity (C6)
Between phase input and the output end of second operational amplifier (U302).
7. process circuit (100) according to claim 1, it is characterised in that the driver element (U4) is anti-phase ratio
Amplifier.
8. it is a kind of to have the earphone monitored with active noise reduction function concurrently, it is characterised in that to include：
Feedforward microphone (MIC), for gathering the voice signal outside earphone；
Process circuit (100) any one of claim 1 to 7, connects via feedforward microphone terminals (Jin+, Jin-)
The voice signal is received, and the voice signal that Jing is processed is exported via loudspeaker wiring end (Jout+, Jout-)；And,
Loudspeaker (SPK), for according to the voice signal sounding.
9. earphone according to claim 8, it is characterised in that the earphone is provided with mode selector switch and controller,
The mode selector switch is arranged by the two kinds of on off states of itself and enables letter to controller output noise reduction respectively
Number and monitor enable signal；
The controller is arranged to enable the on off state that signal controls all controlling switches according to the noise reduction, so that described
Process circuit provides decrease of noise functions；
The controller is also configured to enable the on off state that signal controls all controlling switches according to described monitoring, so that institute
State process circuit and monitor function is provided.
10. earphone according to claim 9, it is characterised in that the process circuit (100) is opened by single-pole single-throw(SPST simulation
Close chip and all of controlling switch (K3, KR2, KC2) is provided.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620868266.2U CN206100375U (en) | 2016-08-11 | 2016-08-11 | Have treatment circuit and earphone of monitor and active noise reduction function concurrently |
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| CN201620868266.2U CN206100375U (en) | 2016-08-11 | 2016-08-11 | Have treatment circuit and earphone of monitor and active noise reduction function concurrently |
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| CN206100375U true CN206100375U (en) | 2017-04-12 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106131731A (en) * | 2016-08-11 | 2016-11-16 | 歌尔股份有限公司 | Have the process circuit and earphone monitored with active noise reduction function concurrently |
| CN108564939A (en) * | 2018-06-28 | 2018-09-21 | 陈经纶 | A kind of active sound field extension noise reduction system |
| CN108810692A (en) * | 2018-05-25 | 2018-11-13 | 会听声学科技（北京）有限公司 | Active noise reduction system, active denoising method and earphone |
| CN110753285A (en) * | 2019-10-24 | 2020-02-04 | 歌尔股份有限公司 | Method, device and equipment for processing sound signal of noise reduction earphone and storage medium |
-
2016
- 2016-08-11 CN CN201620868266.2U patent/CN206100375U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106131731A (en) * | 2016-08-11 | 2016-11-16 | 歌尔股份有限公司 | Have the process circuit and earphone monitored with active noise reduction function concurrently |
| CN106131731B (en) * | 2016-08-11 | 2022-06-14 | 歌尔股份有限公司 | Processing circuit with monitoring and active noise reduction functions and earphone |
| CN108810692A (en) * | 2018-05-25 | 2018-11-13 | 会听声学科技（北京）有限公司 | Active noise reduction system, active denoising method and earphone |
| CN108564939A (en) * | 2018-06-28 | 2018-09-21 | 陈经纶 | A kind of active sound field extension noise reduction system |
| CN110753285A (en) * | 2019-10-24 | 2020-02-04 | 歌尔股份有限公司 | Method, device and equipment for processing sound signal of noise reduction earphone and storage medium |
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