CN206472291U - A kind of audio-frequency amplifier and audio amplifier system - Google Patents
A kind of audio-frequency amplifier and audio amplifier system Download PDFInfo
- Publication number
- CN206472291U CN206472291U CN201621380519.8U CN201621380519U CN206472291U CN 206472291 U CN206472291 U CN 206472291U CN 201621380519 U CN201621380519 U CN 201621380519U CN 206472291 U CN206472291 U CN 206472291U
- Authority
- CN
- China
- Prior art keywords
- resistance
- electric capacity
- triode
- audio
- audio signal
- 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.)
- Expired - Fee Related
Links
Landscapes
- Amplifiers (AREA)
Abstract
Embodiment of the present utility model discloses a kind of audio-frequency amplifier and audio amplifier system, is related to audio amplifying technique, can effectively reduce audio signal distortion.The audio-frequency amplifier includes：Amplify adjustment module, simulated audio signal amplification module and low-pass filtering module, wherein, amplification adjustment module is connected with simulated audio signal amplification module, and simulated audio signal amplification module is connected with low-pass filtering module.The utility model is applied to the controllable simulation audio-frequency amplifier of security monitoring video camera.
Description
Technical field
The utility model is related to audio amplifying technique, more particularly to a kind of audio-frequency amplifier and audio amplifier system.
Background technology
Electret condenser microphone has that small volume, simple in construction, electroacoustic performance be good, low-cost feature, is widely used in boxlike
It is a kind of the most frequently used capacitor microphone in the equipment such as recorder, wireless microphone and sound control circuit.The input impedance of Electret condenser microphone
And output impedance is higher, it is then desired to a FET is set in the shell of the Electret condenser microphone as impedance transducer,
Direct-current working volts are needed during its work.
In safety monitoring application field, Electret condenser microphone is often applied in digital video recorder (DVR, Digital Video
Recorder in), communicated with video camera by head all-around mobile and zoom (PTZ, Pan, Tilt, Zoom), realize security protection
Monitor purpose.Wherein, PTZ represents mobile head comprehensive (left and right, up and down) and zoom of camera lens, zoom control.Due to electret
Body microphone is applied to various different scenes, it is necessary to adjust volume according to different scenes, and filtering process is amplified to volume.
In the prior art, typically filtering process is amplified using digital circuit, the number after Electret condenser microphone pickup to audio signal
Although word circuit can realize amplification filter function, because digital circuit noise robustness is not good, when audio signal is weaker
Signal amplification is carried out, audio signal distortion can be caused, causes the audio signal quality of amplification relatively low.
Utility model content
In view of this, the utility model embodiment provides a kind of audio-frequency amplifier and audio amplifier system, can effectively drop
Bass distorted signals, lifts the audio signal quality of amplification, not good to solve existing digital circuit noise robustness, in sound
The problem of signal amplification causes audio signal distortion is carried out when frequency signal is weaker.
In a first aspect, the utility model embodiment provides a kind of audio-frequency amplifier, including：Amplify adjustment module, analog audio
Frequency signal amplification module and low-pass filtering module, wherein,
Amplification adjustment module is connected with simulated audio signal amplification module, simulated audio signal amplification module and LPF
Module is connected.
With reference in a first aspect, in the first embodiment of first aspect, the amplification adjustment module includes：One or three
Pole pipe, the second triode, the 3rd triode, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th
Resistance, the 7th resistance and the 8th resistance, wherein,
One end of 6th resistance is connected with the first output end of outside multiplication factor Regulate signal controller, the other end and
The base stage of first triode is connected；
One end of 7th resistance is connected with the second output end of outside multiplication factor Regulate signal controller, the other end and
The base stage of second triode is connected；
One end of 8th resistance is connected with the 3rd output end of outside multiplication factor Regulate signal controller, the other end and
The base stage of 3rd triode is connected；
One end of first resistor is connected with the first DC power supply terminal, the other end respectively with second resistance, 3rd resistor, the 4th
One end of resistance and the 5th resistance is connected；
The other end ground connection of second resistance；
The other end of 3rd resistor is connected with the colelctor electrode of the first triode；
The other end of 4th resistance is connected with the colelctor electrode of the second triode；
The other end of 5th resistance is connected with the colelctor electrode of the 3rd triode；
The grounded emitter of first triode, the second triode and the 3rd triode.
With reference to the first embodiment of first aspect, in second of embodiment of first aspect, the analog audio
Frequency signal amplification module includes：9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th
Resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 4th triode and the first operation amplifier
Device, wherein,
One end of 9th resistance is connected with the second DC power supply terminal, the other end respectively with alternating current source and the first electric capacity
One end be connected, alternating current source exports audio signal；
One end of tenth resistance is connected with the 3rd DC power supply terminal, the other end respectively with the other end of the first electric capacity and
The in-phase input end of one operational amplifier is connected；
One end of 3rd electric capacity is connected with one end of the 4th resistance, other end one end respectively with the 11st resistance, second
The out-phase input of one end of electric capacity and the first operational amplifier is connected, and the first operational amplifier is supplied by the 6th DC power supply terminal
Electricity；
The other end, one end of the 4th electric capacity and the first computing of the other end of 11st resistance respectively with the second electric capacity are put
The output end of big device is connected；
The other end of 4th electric capacity is connected with one end of the 5th electric capacity and one end of the 13rd resistance respectively；
The other end of 5th electric capacity is connected with one end of the 12nd resistance and the base stage of the 4th triode respectively；
The other end of 12nd resistance is connected with the 4th DC power supply terminal；
The colelctor electrode of 4th triode is connected with the 5th DC power supply terminal, the other end of emitter stage respectively with the 13rd resistance
And the 14th resistance one end be connected；
The other end ground connection of 14th resistance.
With reference to second of embodiment of first aspect, in the third embodiment of first aspect, the low pass filtered
Ripple module includes：15th resistance, the 16th resistance, the 17th resistance, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity and
Two operational amplifiers, wherein,
One end of 15th resistance is connected with the emitter stage of the 4th triode, the one end of the other end respectively with the 16th resistance
And the 7th electric capacity one end be connected；
The other end of 16th resistance one end respectively with the 8th electric capacity and the in-phase input end of the second operational amplifier
It is connected；
The other end and the out-phase input of the second operational amplifier of the other end of 7th electric capacity respectively with the 8th electric capacity
It is connected, the second operational amplifier is powered by the 7th DC power supply terminal；
The output end of second operational amplifier respectively with the out-phase input of the second operational amplifier and the 6th electric capacity
One end is connected；
The other end of 6th electric capacity is connected with one end of the 17th resistance and exports the audio signal of amplification；
The other end ground connection of 17th resistance.
Second aspect, the utility model embodiment provides a kind of audio amplifier system, including：Digital video recorder and
The video camera being attached thereto, wherein,
Digital video recorder includes：Screen menu type adjustment unit, DVR rear end equipments unit and DVR audio units；
Video camera includes：PTZ decoding units, MCU control unit and audio-frequency amplifier；
Screen menu type adjustment unit is connected with DVR rear end equipment units, DVR rear end equipments unit and PTZ decoding units
It is connected, PTZ decoding units are connected with MCU control unit, and MCU control unit is connected with audio-frequency amplifier, audio-frequency amplifier and DVR
Audio unit is connected；
DVR rear end equipments unit carries out PTZ communications with PTZ decoding units, and PTZ decoding units are carried out with MCU control unit
IC bus communicates, and MCU control unit exports multiplication factor Regulate signal by I/O interface to audio-frequency amplifier.
With reference to second aspect, in the first embodiment of second aspect, the audio-frequency amplifier includes：Amplification regulation
Module, simulated audio signal amplification module and low-pass filtering module, wherein,
Amplification adjustment module is connected with simulated audio signal amplification module, simulated audio signal amplification module and LPF
Module is connected.
A kind of audio-frequency amplifier and audio amplifier system that the utility model embodiment is provided, audio-frequency amplifier include：Put
Big adjustment module, simulated audio signal amplification module and low-pass filtering module, wherein, amplification adjustment module is believed with analogue audio frequency
Number amplification module is connected, and simulated audio signal amplification module is connected with low-pass filtering module, can effectively reduce audio signal and lose
Very, the audio signal quality of lifting amplification, not good to solve existing digital circuit noise robustness, when audio signal is weaker
Carry out the problem of signal amplification causes audio signal distortion.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the audio-frequency amplifier circuit structural representation of embodiment one of the present utility model；
Fig. 2 is the analogue audio frequency amplification system structural representation of embodiment two of the present utility model.
Embodiment
The utility model embodiment is described in detail below in conjunction with the accompanying drawings.
It will be appreciated that described embodiment is only a part of embodiment of the utility model, rather than whole implementation
Example.Based on the embodiment in the utility model, those of ordinary skill in the art are obtained under the premise of creative work is not made
The all other embodiment obtained, belongs to the scope of the utility model protection.
Fig. 1 is the audio-frequency amplifier circuit structural representation of embodiment one of the present utility model, as shown in figure 1, can include：
Amplify adjustment module 11, simulated audio signal amplification module 12 and low-pass filtering module 13, wherein,
Amplification adjustment module 11 be connected with simulated audio signal amplification module 12, simulated audio signal amplification module 12 with it is low
Pass filtering module 13 is connected.
In the present embodiment, as an alternative embodiment, amplification adjustment module 11 includes：First triode (Q1), the two or three
Pole pipe (Q2), the 3rd triode (Q3), first resistor (R1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4),
5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7) and the 8th resistance (R8), wherein,
One end of 6th resistance (R6) is connected with the first output end of outside multiplication factor Regulate signal controller, another
End is connected with the base stage of the first triode (Q1)；
One end of 7th resistance (R7) is connected with the second output end of outside multiplication factor Regulate signal controller, another
End is connected with the base stage of the second triode (Q2)；
One end of 8th resistance (R8) is connected with the 3rd output end of outside multiplication factor Regulate signal controller, another
End is connected with the base stage of the 3rd triode (Q3)；
One end of first resistor (R1) is connected with the first DC power supply terminal, the other end respectively with second resistance (R2), the 3rd
One end of resistance (R3), the 4th resistance (R4) and the 5th resistance (R5) is connected；
The other end ground connection of second resistance (R2)；
The other end of 3rd resistor (R3) is connected with the colelctor electrode of the first triode (Q1)；
The other end of 4th resistance (R4) is connected with the colelctor electrode of the second triode (Q2)；
The other end of 5th resistance (R5) is connected with the colelctor electrode of the 3rd triode (Q3)；
The grounded emitter of first triode (Q1), the second triode (Q2) and the 3rd triode (Q3).
In the present embodiment, as an alternative embodiment, the DC voltage of the first DC power supply terminal output is 5 volts, the first electricity
The resistance for hindering (R1) is 100k ohm, and the resistance of second resistance (R2) is 3k ohm, and the resistance of 3rd resistor (R3) is 3k ohm,
The resistance of 4th resistance (R4) is 1k ohm, and the resistance of the 5th resistance (R5) is 500 ohm, and the resistance of the 6th resistance (R6) is
10k ohm, the resistance of the 7th resistance (R7) is 10k ohm, and the resistance of the 8th resistance (R8) is 10k ohm.
In the present embodiment, as an alternative embodiment, simulated audio signal amplification module 12 includes：9th resistance (R9),
Tenth resistance (R10), the 11st resistance (R11), the 12nd resistance (R12), the 13rd resistance (R13), the 14th resistance
(R14), the first electric capacity (C1), the second electric capacity (C2), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 5th electric capacity (C5), the four or three
Pole pipe (Q4) and the first operational amplifier (U1A), wherein,
One end of 9th resistance (R9) is connected with the second DC power supply terminal, the other end respectively with alternating current source and first
One end of electric capacity (C1) is connected, alternating current source exports audio signal；
One end of tenth resistance (R10) is connected with the 3rd DC power supply terminal, and the other end is another with the first electric capacity (C1) respectively
The in-phase input end of one end and the first operational amplifier (U1A) is connected；
One end of 3rd electric capacity (C3) is connected with one end of the 4th resistance (R4), the other end respectively with the 11st resistance
(R11) the out-phase input of one end, one end of the second electric capacity (C2) and the first operational amplifier (U1A) is connected, the first fortune
Amplifier (U1A) is calculated to be powered by the 6th DC power supply terminal；
The other end of 11st resistance (R11) other end respectively with the second electric capacity (C2), one end of the 4th electric capacity (C4)
And first operational amplifier (U1A) output end be connected；
The one end and one end of the 13rd resistance (R13) of the other end of 4th electric capacity (C4) respectively with the 5th electric capacity (C5)
It is connected；
The other end of 5th electric capacity (C5) one end respectively with the 12nd resistance (R12) and the base of the 4th triode (Q4)
Extremely it is connected；
The other end of 12nd resistance (R12) is connected with the 4th DC power supply terminal；
The colelctor electrode of 4th triode (Q4) is connected with the 5th DC power supply terminal, emitter stage respectively with the 13rd resistance
(R13) the other end and one end of the 14th resistance (R14) is connected；
The other end ground connection of 14th resistance (R14).
In the present embodiment, as an alternative embodiment, the DC voltage of the second DC power supply terminal output is 5 volts, alternating current
The alternating voltage of source output is 10 millivolts, and the DC voltage of the 3rd DC power supply terminal output is 5 volts, and the 4th DC power supply terminal is defeated
The DC voltage gone out is 5 volts, and the DC voltage of the 5th DC power supply terminal output is 5 volts, the direct current of the 6th DC power supply terminal output
Voltage is 12 volts.
The resistance of 9th resistance (R9) is 2.2k ohm, and the resistance of the tenth resistance (R10) is 15k ohm, the 11st resistance
(R11) resistance is 30k ohm, and the resistance of the 12nd resistance (R12) is 47k ohm, and the resistance of the 13rd resistance (R13) is
4.7k ohm, the resistance of the 14th resistance (R14) is 10k ohm, and the capacitance of the first electric capacity (C1) is 100 nanofarads, the second electricity
The capacitance for holding (C2) is 680 pico farads, and the capacitance of the 3rd electric capacity (C3) is 10 microfarads, and the capacitance of the 4th electric capacity (C4) is
330 nanofarads, the capacitance of the 5th electric capacity (C5) is 33 nanofarads.
In the present embodiment, as an alternative embodiment, low-pass filtering module 13 includes：15th resistance (R15), the 16th
Resistance (R16), the 17th resistance (R17), the 6th electric capacity (C6), the 7th electric capacity (C7), the 8th electric capacity (C8) and the second computing
Amplifier (U1B), wherein,
One end of 15th resistance (R15) is connected with the emitter stage of the 4th triode (Q4), and the other end is respectively with the 16th
One end of resistance (R16) and one end of the 7th electric capacity (C7) are connected；
The other end of 16th resistance (R16) one end respectively with the 8th electric capacity (C8) and the second operational amplifier
(U1B) in-phase input end is connected；
The other end and the second operational amplifier (U1B) of the other end of 7th electric capacity (C7) respectively with the 8th electric capacity (C8)
Out-phase input be connected, the second operational amplifier (U1B) is powered by the 7th DC power supply terminal；
The output end of second operational amplifier (U1B) respectively with the out-phase input of the second operational amplifier (U1B) and
One end of 6th electric capacity (C6) is connected；
The other end of 6th electric capacity (C6) is connected with one end of the 17th resistance (R17) and exports the audio signal of amplification；
The other end ground connection of 17th resistance (R17).
In the present embodiment, as an alternative embodiment, the DC voltage of the 7th DC power supply terminal output is 12 volts.
The resistance of 15th resistance (R15) is 2k ohm, and the resistance of the 16th resistance (R16) is 20k ohm, the 17th electricity
The resistance for hindering (R17) is 1k ohm, and the capacitance of the 6th electric capacity (C6) is 2.2 microfarads, and the capacitance of the 7th electric capacity (C7) is 10
Nanofarad, the capacitance of the 8th electric capacity (C8) is 1 nanofarad.
In the present embodiment, amplification adjustment module 11 in the first triode (Q1) Q1, the second triode (Q2) Q2, the three or three
Pole pipe (Q3) Q3 mainly completes the regulation of multiplication factor.
In the present embodiment, as an alternative embodiment, outside multiplication factor Regulate signal controller is microprocessing unit
(MCU, Micro Controller Unit), the D1 ends of the 6th resistance (R6), the D2 ends of the 7th resistance (R7), the 8th resistance
(R8) input and output (IO, Input and Output) interface that D3 ends are connected to MCU is controlled, when I/O interface distinguishes defeated
When going out 000,001,010,011,100,101,110,111, the multiplication factor that can control simulated audio signal is respectively 5,10,
20th, 25,35,40,50,55 times.
In the present embodiment, the first operational amplifier (U1A) and the four or three pole in simulated audio signal amplification module 12
Manage amplification and high-pass filtering that (Q4) mainly completes simulated audio signal.9th resistance (R9), the tenth resistance (R10) and first
Electric capacity (C1) mainly provides the direct current biasing of Electret condenser microphone so that Electret condenser microphone is operated in normal condition, the 4th triode
(Q4) it is operated in and penetrates a grade following state, it is main to complete impedance change action, audio signal distortion can be effectively reduced, while can be with
Realize the interception to low frequency signal.
In the present embodiment, low-pass filtering module 13 mainly completes the function of LPF, can be to the low frequency of audio signal
Interference signal part is filtered out, and does not interfere with the quality of voice signal, while audio frequency effect is provided, so as to lift the sound of amplification
Frequency signal quality.Output uses AC coupled mode, reduces the audio input that DVR is directly inputted to after output DC current
End.
Fig. 2 is the analogue audio frequency amplification system structural representation of embodiment two of the present utility model.Referring to Fig. 2, including：Numeral
Video cassette recorder (DVR) 21 and the video camera 22 being attached thereto, wherein,
Digital video recorder 21 includes：Screen menu type regulation (OSD, On Screen Display) unit 211, DVR
Rear end equipment unit 212 and DVR audio units 213；
Video camera 22 includes：PTZ decoding units 221, MCU control unit 222 and audio-frequency amplifier 223；
Screen menu type adjustment unit 211 is connected with DVR rear end equipments unit 212, DVR rear end equipments unit 212 and PTZ
Decoding unit 221 is connected, and PTZ decoding units 221 are connected with MCU control unit 222, MCU control unit 222 and audio-frequency amplifier
223 are connected, and audio-frequency amplifier 223 is connected with DVR audio units 213；
DVR rear end equipments unit 212 carries out PTZ communications with PTZ decoding units 221, and PTZ decoding units 221 and MCU is controlled
Unit 222 carries out IC bus (IIC, Inter-Integrated Circuit) communication, and MCU control unit 222 passes through
I/O interface exports multiplication factor Regulate signal to audio-frequency amplifier 223.
In the present embodiment, audio-frequency amplifier 223 includes：Amplify adjustment module 11, simulated audio signal amplification module 12 with
And low-pass filtering module 13, concrete structure can be found in Fig. 1.
In the present embodiment, as an alternative embodiment, video camera is analog video camera.Utilize existing analog video camera
The PTZ communication functions of control signal can be transmitted, in analog video camera, PTZ communications can pass through the specific sky to vision signal
Remaining position insertion communication pattern transmits the function of control signal to realize.
In the present embodiment, by the OSD menu of DVR OSD unit, multiplication factor Regulate signal is exported, then by coaxial
The PTZ communication functions of cable, the MCU control unit of video camera, MCU will be passed to from the DVR multiplication factor Regulate signals inputted
Control unit controls audio-frequency amplifier by 3 I/O interfaces, and audio-frequency amplifier is carried out to the audio signal from Electret condenser microphone
Amplification filtering, the DVR audio units that DVR is sent into afterwards carry out sample quantization coding, and the times magnification of simulated audio signal can be achieved
Number regulation.So, communicated by PTZ and realize the adjustable setting of simulated audio signal multiplication factor, when ambient sound is too small or mistake
When big, it can be adjusted by DVR OSD menu and audio signal multiplication factor is set, to ensure audio signal multiplication factor
In suitable scope.Because the adjustment of audio signal multiplication factor is directly to adjust preposition Simulation scale-up multiple, with adjustment
Digital multiplication factor is compared, with the anti-noise sound intensity, and the amplified signal when audio signal is weaker can be left undistorted, so as to have
Effect reduction audio signal distortion, lifts the audio signal quality of amplification.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence " including one ... ", it is not excluded that
Also there is other identical element in the process including the key element, method, article or equipment.
Each embodiment in this specification is described by the way of related, identical similar portion between each embodiment
Divide mutually referring to what each embodiment was stressed is the difference with other embodiment.
It should be appreciated that each several part of the present utility model can be realized with hardware, software, firmware or combinations thereof.
The utility model embodiment also provides a kind of electronic equipment, and the electronic equipment is comprising described in foregoing any embodiment
Device.
The electronic equipment exists in a variety of forms, includes but is not limited to：
(1) mobile communication equipment：The characteristics of this kind equipment is that possess mobile communication function, and to provide speech, data
Communicate as main target.This Terminal Type includes：Smart mobile phone (such as iPhone), multimedia handset, feature mobile phone, and it is low
Hold mobile phone etc..
(2) super mobile personal computer equipment：This kind equipment belongs to the category of personal computer, there is calculating and processing work(
Can, typically also possess mobile Internet access characteristic.This Terminal Type includes：PDA, MID and UMPC equipment etc., such as iPad.
(3) portable entertainment device：This kind equipment can show and play content of multimedia.The kind equipment includes：Audio,
Video player (such as iPod), handheld device, e-book, and intelligent toy and portable car-mounted navigation equipment.
(4) server：The equipment for providing the service of calculating, the composition of server is total including processor, hard disk, internal memory, system
Line etc., server is similar with general computer architecture, but is due to need to provide highly reliable service, therefore in processing energy
Require higher in terms of power, stability, reliability, security, scalability, manageability.
(5) other electronic equipments with data interaction function.
It is described above, embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any one skilled in the art is in the technical scope that the utility model is disclosed, the change that can be readily occurred in
Change or replace, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should be with right
It is required that protection domain be defined.
Claims (3)
1. a kind of audio-frequency amplifier, it is characterised in that including：Amplify adjustment module, simulated audio signal amplification module and low
Pass filtering module, wherein,
Amplification adjustment module is connected with simulated audio signal amplification module, simulated audio signal amplification module and low-pass filtering module
It is connected；
The amplification adjustment module includes：First triode, the second triode, the 3rd triode, first resistor, second resistance,
3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance, wherein,
One end of 6th resistance is connected with the first output end of outside multiplication factor Regulate signal controller, the other end and first
The base stage of triode is connected；
One end of 7th resistance is connected with the second output end of outside multiplication factor Regulate signal controller, the other end and second
The base stage of triode is connected；
One end of 8th resistance is connected with the 3rd output end of outside multiplication factor Regulate signal controller, the other end and the 3rd
The base stage of triode is connected；
One end of first resistor is connected with the first DC power supply terminal, the other end respectively with second resistance, 3rd resistor, the 4th resistance
And the 5th resistance one end be connected；
The other end ground connection of second resistance；
The other end of 3rd resistor is connected with the colelctor electrode of the first triode；
The other end of 4th resistance is connected with the colelctor electrode of the second triode；
The other end of 5th resistance is connected with the colelctor electrode of the 3rd triode；
The grounded emitter of first triode, the second triode and the 3rd triode.
2. audio-frequency amplifier according to claim 1, it is characterised in that the simulated audio signal amplification module includes：
9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th resistance, the first electric capacity, the second electricity
Appearance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 4th triode and the first operational amplifier, wherein,
One end of 9th resistance is connected with the second DC power supply terminal, the other end respectively with alternating current source and the first electric capacity one
End is connected, alternating current source exports audio signal；
One end of tenth resistance is connected with the 3rd DC power supply terminal, and the other end is transported with the other end of the first electric capacity and first respectively
The in-phase input end for calculating amplifier is connected；
One end of 3rd electric capacity is connected with one end of the 4th resistance, other end one end respectively with the 11st resistance, the second electric capacity
One end and the first operational amplifier out-phase input be connected, the first operational amplifier is powered by the 6th DC power supply terminal；
The other end, one end of the 4th electric capacity and the first operational amplifier of the other end of 11st resistance respectively with the second electric capacity
Output end be connected；
The other end of 4th electric capacity is connected with one end of the 5th electric capacity and one end of the 13rd resistance respectively；
The other end of 5th electric capacity is connected with one end of the 12nd resistance and the base stage of the 4th triode respectively；
The other end of 12nd resistance is connected with the 4th DC power supply terminal；
The colelctor electrode of 4th triode is connected with the 5th DC power supply terminal, emitter stage respectively with the other end of the 13rd resistance and
One end of 14th resistance is connected；
The other end ground connection of 14th resistance.
3. audio-frequency amplifier according to claim 2, it is characterised in that the low-pass filtering module includes：15th electricity
Resistance, the 16th resistance, the 17th resistance, the 6th electric capacity, the 7th electric capacity, the 8th electric capacity and the second operational amplifier, wherein,
One end of 15th resistance is connected with the emitter stage of the 4th triode, the other end respectively with one end of the 16th resistance and
One end of 7th electric capacity is connected；
The other end of 16th resistance is connected with one end of the 8th electric capacity and the in-phase input end of the second operational amplifier respectively；
The other end of 7th electric capacity is connected with the other end of the 8th electric capacity and the out-phase input of the second operational amplifier respectively,
Second operational amplifier is powered by the 7th DC power supply terminal；
The output end of second operational amplifier out-phase input respectively with the second operational amplifier and one end of the 6th electric capacity
It is connected；
The other end of 6th electric capacity is connected with one end of the 17th resistance and exports the audio signal of amplification；
The other end ground connection of 17th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621380519.8U CN206472291U (en) | 2016-12-15 | 2016-12-15 | A kind of audio-frequency amplifier and audio amplifier system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621380519.8U CN206472291U (en) | 2016-12-15 | 2016-12-15 | A kind of audio-frequency amplifier and audio amplifier system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206472291U true CN206472291U (en) | 2017-09-05 |
Family
ID=59711565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621380519.8U Expired - Fee Related CN206472291U (en) | 2016-12-15 | 2016-12-15 | A kind of audio-frequency amplifier and audio amplifier system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206472291U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115459803A (en) * | 2022-08-30 | 2022-12-09 | 陕西烽火电子股份有限公司 | Nationwide voice self-adaptive circuit design |
-
2016
- 2016-12-15 CN CN201621380519.8U patent/CN206472291U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115459803A (en) * | 2022-08-30 | 2022-12-09 | 陕西烽火电子股份有限公司 | Nationwide voice self-adaptive circuit design |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104021148A (en) | Method and device for adjusting sound effect | |
| CN108022466A (en) | A kind of meeting display device based on multimedia technology | |
| CN206472291U (en) | A kind of audio-frequency amplifier and audio amplifier system | |
| CN103428593B (en) | The device of audio signal is gathered based on speaker | |
| CN107846557A (en) | A kind of collection distribution method, system and the storage device of multichannel audio-video frequency signal | |
| KR20230119205A (en) | Coding method, coding device, electronic device and storage medium | |
| CN201681625U (en) | Multi-directional playing flat-panel mobile terminal | |
| CN109819188B (en) | Video processing method and terminal equipment | |
| CN102750963A (en) | Intelligent DVD (Digital Video Disk) memory player and method | |
| CN106507242A (en) | A kind of audio devices and terminal | |
| CN108235204A (en) | The method for obtaining the electronic device for listening force data and force data being listened to obtain | |
| CN208094741U (en) | A kind of intelligent microphone based on speech recognition technology | |
| CN203151703U (en) | Sound pick-up device | |
| CN205883452U (en) | Novel law enforcement record appearance | |
| CN205003507U (en) | Long -range formula pronunciation dibble seeding circuit that awakens up | |
| CN209517434U (en) | A kind of noise reduction folder neck microphone | |
| CN101345858B (en) | Tripod head camera for automatically tracking sound source | |
| KR100630206B1 (en) | Method for adjusting volume in music file | |
| CN203734825U (en) | Audio signal processing circuit and audio playing device | |
| CN103272383A (en) | Portable game device | |
| CN210274436U (en) | Audio processing circuit and conference microphone | |
| CN209390256U (en) | A kind of headset circuit, headset | |
| CN207867457U (en) | A kind of voice control terminal with gesture control function | |
| CN206364980U (en) | A kind of many rail audio defeat acquisition systems of scientific and technological court | |
| Vrysis et al. | Mobile Audio Measurements Platform: Toward Audio Semantic Intelligence into Ubiquitous Computing Environments |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170905 Termination date: 20211215 |