A kind of mike monomer suppressing resonanceTechnical field
The present invention relates to technical field of electronic equipment, particularly relate to a kind of mike suppressing resonanceMonomer.
Background technology
Mike requires to have certain requirement in actual applications to frequency response, and e.g., high frequency needsSuppressing, certain frequency signal needs to eliminate, and wind is made an uproar, car is made an uproar or the power frequency of 50HZ is made an uproarNeeding suppression etc., in prior art, mike is mainly (integrated by the IC being integrated on pcb boardCircuit) and the amplifier that is encapsulated in a box-shape and buffer constitute, be encapsulated in metalThe effect playing radio shielding on pcb board it is arranged on, it is impossible to complete frequency response in shellRequirement.
Put into metal-back due to sensor and will produce Andy Holmes resonance point, can allow frequency response upwardsSticking up, additionally the car of low frequency is made an uproar, the power frequency of wind-dryness or 50HZ is made an uproar and when loudspeaker and mikeLoudspeaker are passed in the noise warning mike amplification produced time close again, form primary Ioops, increaseAdd noise, therefore, how to have suppressed producing above-mentioned phenomenon and become what those skilled in the art facedA great problem.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of mike monomer suppressing resonance, byDirectly add one between amplifier and buffer and include first order circuit, second level circuit and the third levelThe equalizer of circuit, makes the sensing signal after amplifier amplifies become more mild, this skillArt scheme particularly as follows:
A kind of mike monomer suppressing resonance, wherein, described mike monomer includes:
Power input；
Biasing circuit, is coupled to described power input, to export bias voltage；
Induction apparatus, one end is connected with described biasing circuit, to receive and to sense described bias voltage,Obtain sensing signal and output it；
Amplifier, is connected with the other end of described induction apparatus, is amplified described sensing signalRear output；
Equalizer, is coupled to described amplifier, with regulation sensing letter after amplifier amplifiesNumber；
Buffer, is connected with described equalizer, passes through with the sensing signal after ensureing described amplificationData synchronization transmissions after described equalizer；
Wave filter, is coupled to described buffer, is filtered through the sensing after described buffer processesSignal.
Above-mentioned mike monomer, wherein, first order circuit that described equalizer includes being sequentially connected with,Second level circuit and tertiary circuit, wherein:
First order circuit is connected with the outfan of described amplifier；
Tertiary circuit is connected with the input of described buffer.
Above-mentioned mike monomer, wherein, described first order circuit also includes:
First amplifier, the normal phase input end of described first amplifier and one first voltage connect；
First electric capacity, described first be capacitively coupled to described first amplifier inverting input andOutfan；
One resistance, described resistance is in parallel with described first electric capacity.
Above-mentioned mike monomer, wherein, described second level circuit also includes:
Second amplifier, the normal phase input end of described second amplifier and one second voltage connect；
The inverting input of described second amplifier is coupled to the outfan of described first amplifier；
One resistance, is coupled to inverting input and the outfan of described second amplifier.
Above-mentioned mike monomer, wherein, described tertiary circuit also includes:
3rd amplifier, described 3rd amplifier normal phase input end and a tertiary voltage connect；
One electric capacity, is coupled to inverting input and the outfan of described 3rd amplifier；
The inverting input of described 3rd amplifier is coupled to the outfan of described second amplifier.
Above-mentioned mike monomer, wherein, described induction apparatus is a capacitive sensing device.
Preferably, the first voltage, the second voltage, tertiary voltage are equal.
The beneficial effect that the present invention has the advantage that and can reach:
By using the technical program, effectively prevent the generation of echo, effectively inhibit simultaneouslyA part during low frequency wind is made an uproar, car is made an uproar or the power frequency of 50HZ is made an uproar, makes the audio frequency of output believeNumber more mild, effectively inhibit the generation of noise, reach the requirement to frequency response.
Accompanying drawing explanation
The detailed description with reference to the following drawings, non-limiting example made by reading, thisBright and characteristic shape and advantage will become more apparent.Labelling identical in whole accompanying drawingsIndicate identical part.Can not be drawn to scale accompanying drawing, it is preferred that emphasis is the present invention is shownPurport.
Fig. 1 is prior art mike internal components structural representation；
Fig. 2 is mike internal components structural representation in the embodiment of the present invention；
Fig. 3 is equalizer internal circuit diagram in the embodiment of the present invention.
Embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings, but notRestriction as the present invention.
Structure shown in Figure 1, in traditional method, mike internal components structure chart, specifically wrapsInclude an induction apparatus 1, biasing circuit 2, amplifier 3, buffer 4 and wave filter 5, the most partiallyThe voltage that voltage input end VDD inputs is converted to bias voltage by circuits, and induction apparatus 1 canBeing a capacitance inductor, the biasing voltage signal that biasing circuit provides is transmitted by induction apparatus 1To amplifier 3, the sensing signal after amplifier amplifies eventually passes filter through buffer 4Ripple device 5 filters out some clutters, then exports.
See structure shown in accompanying drawing 2, for the embodiment of the present invention includes the Mike of suppression resonanceWind monomer internal components structural representation, mainly includes voltage input end VDD, induction apparatus 1,Biasing circuit 2, amplifier 3, equalizer 6, buffer 4 and wave filter 5, wherein:
Biasing circuit 2, is coupled to voltage input end VDD, to export bias voltage；
Induction apparatus 1, one end is connected with the outfan of biasing circuit 2, to receive and to sense biasingThe bias voltage of circuit 2 output, obtains sensing signal and outputs it；
Amplifier 3, be coupled to induction apparatus 1 relative to the one end being connected with biasing circuit 2The other end, the sensing signal obtaining the induction apparatus 1 got exports after being amplified；
Equalizer 6, is coupled to another relative to the one end being connected with induction apparatus 1 of amplifier 3One end, with regulation sensing signal after amplifier 3 amplifies；
Buffer 4, the input of this buffer is connected with the outfan of equalizer 6, to ensureSensing signal synchronous transfer after equalizer equalizes；
Wave filter 5, is coupled to the outfan of buffer, is filtered through the sense after buffer processesSurvey signal.
As a preferred embodiment of the invention, structure shown in Figure 3, equalizer 6 includesFirst order circuit 7, second level circuit 8 and tertiary circuit 9.
On this basis, further, first order circuit 7 specifically includes:
First amplifier 10, the normal phase input end of the first amplifier 10 and one first voltage connect；
First electric capacity, first is capacitively coupled to inverting input and the outfan of the first amplifier；
Resistance R2, this resistance and the first electric capacity are in parallel.
Second level circuit 8 is a scaling circuit, specifically includes:
Second amplifier 11, the normal phase input end of the second amplifier 11 and one second voltage connect；
The inverting input of the second amplifier 11 is coupled to the outfan of the first amplifier；
One resistance R4, is coupled to inverting input and the outfan of the second amplifier 11.
Tertiary circuit 9 specifically includes:
3rd amplifier 12, the normal phase input end of the 3rd amplifier 12 and a tertiary voltage connect；
One electric capacity, this inverting input being capacitively coupled to the 3rd amplifier 12 and outfan；
The inverting input of the 3rd amplifier 12 is coupled to the outfan of the second amplifier 11.
As a preferred embodiment of the invention, the first voltage, the second voltage, tertiary voltage are equalEqual.
As a preferred embodiment of the invention, the second amplifier 11 and the first amplifier 10 itBetween connect have a resistance R3.
As a preferred embodiment of the invention, the reverse input end of the 3rd amplifier 12 andThe outfan of two amplifiers 11 connects a resistance R5.
As a preferred embodiment of the invention, equalizer also comprises a negative feedback resistor R6,This negative feedback resistor is connected between the input of equalizer and outfan.
In sum, the present invention is by building a mike monomer including equalizer so that windDry, car is made an uproar etc. and to be eliminated, and effectively inhibits high frequency, effectively allows audio signal pass through thisEqualizer is adjusted thus gets a desired effect.
It should be appreciated by those skilled in the art that those skilled in the art combine prior art andAbove-described embodiment can realize described change case, does not repeats at this.Such change case is notAffect the flesh and blood of the present invention, do not repeat them here.
Above presently preferred embodiments of the present invention is described.It is to be appreciated that the present inventionBeing not limited to above-mentioned particular implementation, the equipment and the structure that do not describe in detail the most to the greatest extent shouldIt is interpreted as being practiced with the common mode in this area；Any it is familiar with those skilled in the artMember, without departing under technical solution of the present invention ambit, the method that all may utilize the disclosure aboveWith technology contents, technical solution of the present invention made many possible variations and modification, or be revised asThe Equivalent embodiments of equivalent variations, this has no effect on the flesh and blood of the present invention.Therefore, everyWithout departing from the content of technical solution of the present invention, the technical spirit of the foundation present invention is to above exampleAny simple modification, equivalent variations and the modification done, all still falls within technical solution of the present invention and protectsThe scope protected.