CN110234052A - 2.1 sound channels hold public address microphone - Google Patents
2.1 sound channels hold public address microphone Download PDFInfo
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- CN110234052A CN110234052A CN201910664257.XA CN201910664257A CN110234052A CN 110234052 A CN110234052 A CN 110234052A CN 201910664257 A CN201910664257 A CN 201910664257A CN 110234052 A CN110234052 A CN 110234052A
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- 230000005236 sound signal Effects 0.000 claims description 13
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- 238000009434 installation Methods 0.000 claims description 8
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R5/00—Stereophonic arrangements
- H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/08—Microphones
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
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- Circuit For Audible Band Transducer (AREA)
Abstract
The present invention relates to a kind of 2.1 sound channels to hold public address microphone, including hand holding handle, main body of speaking and sound pick-up.Main body of speaking includes shell, L channel full frequency speaker, right channel full frequency speaker, middle/high frequency loudspeaker and control circuit；The first mounting hole, the second mounting hole, third mounting hole are sequentially arranged in the circumferential direction. on shell, and the first mounting hole, third mounting hole are located at the two opposite sides of shell；L channel full frequency speaker, right channel full frequency speaker are separately mounted to the first mounting hole, third mounting hole, and middle/high frequency loudspeaker is mounted on the second mounting hole.When manpower holds and uses, there are sounding in the left and right sides and front side, control circuit increase circuit of high pass filter, intermediate-frequency gain circuit and mixer circuit by microphone pickup to voice signal carry out signal processing and be input in monophonic to set to carry out power amplification driving middle/high frequency loudspeaker in power amplifier, allow the audience immediately ahead of sounder to obtain public address effect that is clear enough and having certain acoustic pressure.
Description
Technical field
The present invention relates to hand-held public address microphones, hold public address microphone more specifically to a kind of 2.1 sound channels.
Background technique
Currently, well known hand-held public address wheat is by being moving coil pick-up, battery, power board, hand-held shell and two full ranges
Loudspeaker and realization public address.Voice enters drive the speaker public address after power board carries out power amplification by sound pick-up and comes out.
But two full frequency speakers have usually been placed to the right and left of shell due to the limitation of structure, so that expanding
Sound range be immediately ahead of sounder it is very weak, be extremely difficult to perfect public address effect.
Summary of the invention
The technical problem to be solved in the present invention is that providing a kind of hand-held public address microphone of 2.1 sound channels.
The technical solution adopted by the present invention to solve the technical problems is: a kind of hand-held public address microphone of 2.1 sound channels is constructed,
Including hand holding handle, main body of speaking and sound pick-up；
The main body of speaking include shell, L channel full frequency speaker, right channel full frequency speaker, middle/high frequency loudspeaker,
And control circuit；
The first mounting hole, the second mounting hole, third mounting hole, and described first have been sequentially arranged in the circumferential direction. on the shell
Mounting hole, third mounting hole are located at the two opposite sides of the shell；The L channel full frequency speaker, right channel full frequency speaker
It is separately mounted to first mounting hole, third mounting hole, with from the outside sounding in the two opposite sides of the shell, the medium-high frequency
Loudspeaker is mounted on second mounting hole；
The control circuit includes pickup circuit, full range gain circuitry, binary channels full range power amplifier, mixer circuit, high pass filter
Wave device circuit, intermediate-frequency gain circuit set power amplifier in monophonic；
The pickup circuit and the sound pick-up are electrically connected, the full range gain circuitry, mixer circuit respectively with it is described
Pickup circuit is electrically connected；
The binary channels full range power amplifier and the full range gain circuitry are electrically connected, the L channel full frequency speaker, the right side
Sound channel full frequency speaker is electrically connected with the binary channels full range power amplifier respectively, and the binary channels full range power amplifier receives the full range
The processed audio signal of gain circuitry simultaneously drives the L channel full frequency speaker, right channel full frequency speaker to carry out sounding；
The mixer circuit is also electrically connected with the full range gain circuitry, the circuit of high pass filter and the audio mixing
Circuit connection, the intermediate-frequency gain circuit are connect with the circuit of high pass filter, set in the monophonic power amplifier and it is described in
Frequency gain circuitry is electrically connected, and power amplifier is set in the middle/high frequency loudspeaker and the monophonic and is electrically connected, in the monophonic
Power amplifier is set to receive the processed audio signal of the full range gain circuitry and the middle/high frequency loudspeaker is driven to carry out sounding.
Preferably, the control circuit further includes the bluetooth being connected between the pickup circuit and full range gain circuitry
Decoding and DSP processing controller are received, to the processing of received audio signal decoding, the transmission of Xiang Suoshu full range gain circuitry.
Preferably, the main body of speaking further include respectively for the L channel full frequency speaker, right channel full frequency speaker,
Three mounting bases of middle/high frequency loudspeaker installation, are formed with out acoustic aperture in the middle part of each mounting base, for the L channel full range
Loudspeaker, right channel full frequency speaker, middle/high frequency loudspeaker are spoken；
The mounting base is removably mounted on the outside of the shell, and the L channel full frequency speaker, right channel are complete
Band loudspeaker, middle/high frequency loudspeaker reach the shell by first mounting hole, the second mounting hole, third mounting hole respectively
It is interior.
Preferably, the operation panel that control plays is additionally provided in the main body of speaking.
Preferably, the operation panel is located at the shell side opposite with second mounting hole, and the behaviour
It is detachably arranged on the shell as panel.
Preferably, power supply is equipped in the hand holding handle, with to the L channel full frequency speaker, right channel full range loudspeaking
Device, middle/high frequency loudspeaker and control circuit power supply.
Preferably, the power supply is cylinder, and the battery compartment for power supply installation is formed in the hand holding handle.
Preferably, the mixer circuit includes capacitor C1, C2, C4, resistance R1, R2, R4, operational amplifier U1A, the electricity
The one end for holding C1 connects the full range gain circuitry, and the other end of the capacitor C1 connects one end of the resistance R1, the electricity
The one end for holding C2 connects the pickup circuit, and the other end of the capacitor C2 connects one end of the resistance R2, and the operation is put
The second pin of big device U1A connects one end, the resistance of the other end of the resistance R1, the other end of resistance R2 and capacitor C4
One end of R4, the other end of the capacitor C4, the other end of resistance R4 are connect with the first pin of the operational amplifier U1A,
And connect with the circuit of high pass filter, the third pin of the operational amplifier U1A connects reference voltage.
Preferably, the circuit of high pass filter includes capacitor C3, C6, C7, resistance R6, R7, operational amplifier U1B, institute
It is equal with the capacitor of the capacitor C7 to state capacitor C6, the resistance R6 is equal with the resistance of resistance R7, one end of the capacitor C6
It is connect with the mixer circuit, the other end is connect with one end of one end of the capacitor C7 and resistance R7, the capacitor C7's
The other end is connect with the 5th pin of one end of the resistance R6 and operational amplifier U1B, the other end connection of the resistance R6
The 6th pin of reference voltage, the other end of the resistance R7 and the operational amplifier U1B, the 7th pin with the electricity
Hold one end connection of C3, the other end of the capacitor C3 and the intermediate-frequency gain circuit connection.
Preferably, the intermediate-frequency gain circuit includes resistance R3, R5, capacitor C5, operational amplifier U2A, the resistance R3
One end connect with the circuit of high pass filter, one end of the other end of the resistance R3 and the capacitor C5, resistance R5
The third pin of the connection of the second pin of one end and operational amplifier U2A, the operational amplifier U2A connects reference voltage,
First pin of the other end of the capacitor C5, the other end of resistance R5 and the operational amplifier U2A is connected to the list
Power amplifier is set in sound channel.
Implement 2.1 sound channels of the invention hold public address microphone, have the advantages that manpower hold in use,
Two sides sounding, middle/high frequency loudspeaker increase to front side sounding to the left and right respectively for L channel full frequency speaker, right channel full frequency speaker
It is defeated to increase the voice signal progress signal processing that bandpass filter circuit, intermediate-frequency gain circuit and mixer circuit arrive microphone pickup
Enter into dedicated monophonic to set to carry out power amplification driving middle/high frequency loudspeaker in power amplifier, so that the audience immediately ahead of sounder
Public address effect that is clear enough and having certain acoustic pressure can be obtained, the comprehensive covering for meeting public address range is formed useful
The comprehensive public address of sound field, experience sense are more preferable.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is the structural schematic diagram of the hand-held public address microphone of 2.1 sound channels in the embodiment of the present invention；
Fig. 2 is the circuit theory schematic diagram of the hand-held public address microphone of 2.1 sound channels in the embodiment of the present invention；
Fig. 3 is the cross-sectional profile schematic diagram of the main body of speaking of the hand-held public address microphone of 2.1 sound channels in the embodiment of the present invention；
Fig. 4 is the circuit diagram of mixer circuit in Fig. 2, circuit of high pass filter, intermediate-frequency gain circuit.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
Include hand holding handle 3, go out as shown in Figure 1,2.1 sound channels in a preferred embodiment of the invention hold public address microphone
Sound main body 1 and sound pick-up 2, hand holding handle 3 are held for manpower, and the setting of main body of speaking 1 is arranged in 3 upper end of hand holding handle, sound pick-up 2
In 1 upper end of main body of speaking.
In conjunction with shown in Fig. 2, Fig. 3, main body of speaking 1 includes shell 11, L channel full frequency speaker 12, right channel full range loudspeaking
Device 13, middle/high frequency loudspeaker 14 and control circuit 15, sound pick-up 2 are to be transmitted to rear end again for collection site ambient sound
Control circuit 15.
The first mounting hole 111, the second mounting hole 112, third mounting hole 113 have been sequentially arranged in the circumferential direction. on shell 11, and
First mounting hole 111, third mounting hole 113 are located at the two opposite sides of shell 11.L channel full frequency speaker 12, right channel full range
Loudspeaker 13 is separately mounted to the first mounting hole 111, third mounting hole 113, with from the outside sounding in the two opposite sides of shell 11, in
Tweeter 14 is mounted on the second mounting hole 112, allows L channel full frequency speaker 12, right channel full frequency speaker 13, middle height
Band loudspeaker 14 can speak in three faces of product.
Control circuit 15 includes pickup circuit 151, full range gain circuitry 152, binary channels full range power amplifier 153, mixer circuit
154, circuit of high pass filter 157, intermediate-frequency gain circuit 155, set power amplifier 156 in monophonic.Pickup circuit 151 and sound pick-up 2
It is electrically connected, full range gain circuitry 152, mixer circuit 154 are electrically connected with pickup circuit 151 respectively, the sound that sound pick-up 2 obtains
Wave signal through pickup circuit 151 handle be converted to audio signal, pass to full range gain circuitry 152, to audio signal amplification and
Conversion.
Binary channels full range power amplifier 153 and full range gain circuitry 152 are electrically connected, L channel full frequency speaker 12, right channel
Full frequency speaker 13 is electrically connected with binary channels full range power amplifier 153 respectively, and binary channels full range power amplifier 153 receives full range gain circuitry
152 processed audio signals simultaneously drive L channel full frequency speaker 12, right channel full frequency speaker 13 to carry out sounding.
Mixer circuit 154 is also electrically connected with full range gain circuitry 152, circuit of high pass filter 157 and mixer circuit 154
Connection, intermediate-frequency gain circuit 155 are connect with circuit of high pass filter 157.The processed audio signal of full range gain circuitry 152 with
Treated the signal mixing of pickup circuit 151, passes to circuit of high pass filter 157.Circuit of high pass filter 157 allows to be higher than
The frequency of a certain cut-off frequency passes through, and is greatly attenuated lower frequency, it eliminates unnecessary low-frequency component in signal and goes in other words
Low-frequency disturbance is fallen, then has passed to intermediate-frequency gain circuit 155, audio signal has been amplified and has converted.
Power amplifier 156 is set in monophonic and intermediate-frequency gain circuit 155 is electrically connected, and is set in middle/high frequency loudspeaker 14 and monophonic
Power amplifier 156 is electrically connected, and power amplifier 156 is set in monophonic and is received in the processed audio signal of full range gain circuitry 152 and driving
Tweeter 14 carries out sounding.
It is held in manpower in use, L channel full frequency speaker 12, right channel full frequency speaker 13 distinguish two sides to the left and right
Sounding, middle/high frequency loudspeaker 14 increase circuit of high pass filter 157, intermediate-frequency gain circuit 155 and mixer circuit to front side sounding
Voice signal that sound pick-up 2 picks up is carried out signal processing by 154 to be input to set in dedicated monophonic and carries out function in power amplifier 156
Rate amplification driving middle/high frequency loudspeaker 14 allows the audience immediately ahead of sounder to obtain clear enough and have certain acoustic pressure
Public address effect, the comprehensive covering for meeting public address range forms the comprehensive public address of useful sound field, and experience sense is more preferable.
Preferably, control circuit 15 further includes the bluetooth being connected between pickup circuit 151 and full range gain circuitry 152
Decoding and DSP processing controller 158 (DSP:Digital Signal Processing, Digital Signal Processing) are received, with docking
The audio signal decoding of receipts is handled, and is transmitted to full range gain circuitry 152.
In conjunction with shown in Fig. 2, Fig. 4, mixer circuit 154 includes capacitor C1, C2, C4, resistance R1, R2, R4, operational amplifier
One end connection full range gain circuitry 152 of U1A, capacitor C1, one end of the other end connection resistance R1 of capacitor C1, the one of capacitor C2
End connection pickup circuit 151, one end of the other end connection resistance R2 of capacitor C2, the second pin connection of operational amplifier U1A
The other end of resistance R1, one end of the other end of resistance R2 and capacitor C4, resistance R4 one end, the other end, the electricity of capacitor C4
The other end of resistance R4 is connect with the first pin of operational amplifier U1A, and is connect with circuit of high pass filter 157, operation amplifier
The third pin of device U1A connects reference voltage.Mixer circuit 154 can adjust the amplification of audio mixing by adjusting the resistance value of R1, R2
Multiple.
Circuit of high pass filter 157 includes capacitor C3, C6, C7, resistance R6, R7, operational amplifier U1B, capacitor C6 and electricity
The capacitor for holding C7 is equal, and resistance R6 is equal with the resistance of resistance R7, and one end of capacitor C6 is connect with mixer circuit, the other end and electricity
Hold one end of C7 and one end connection of resistance R7, the other end of capacitor C7 and one end of resistance R6 and operational amplifier U1B's
The connection of 5th pin, the other end of resistance R6 connect reference voltage, and the 6th of the other end of resistance R7 and operational amplifier U1B the
Pin, the 7th pin are connect with one end of capacitor C3, and the other end of capacitor C3 is connect with intermediate-frequency gain circuit 155.High pass filter
Wave device circuit 157 is by adjusting the resistance value of resistance R6, R7 and the capacitance adjustment filter cutoff frequency of capacitor C6, C7.
Intermediate-frequency gain circuit 155 includes resistance R3, R5, capacitor C5, operational amplifier U2A, one end of resistance R3 and high pass
Filter circuit 157 connects, the other end and one end of capacitor C5, one end of resistance R5 and the operational amplifier U2A of resistance R3
Second pin connection, the third pin of operational amplifier U2A connects reference voltage, the other end of capacitor C5, resistance R5 it is another
The first pin of one end and operational amplifier U2A, which are connected in monophonic, sets power amplifier 156.Intermediate-frequency gain circuit 155 passes through tune
Save the resistance value adjustment signal amplification factor of R3.
Preferably, in order to facilitate L channel full frequency speaker 12, right channel full frequency speaker 13, middle/high frequency loudspeaker 14
Installation, main body of speaking 1 further includes respectively for L channel full frequency speaker 12, right channel full frequency speaker 13, middle/high frequency loudspeaker
Three mounting bases 16 of 14 installations, the middle part of each mounting base 16 are formed with out acoustic aperture 161, for L channel full frequency speaker 12, the right side
Sound channel full frequency speaker 13, middle/high frequency loudspeaker 14 are spoken.
Mounting base 16 is removably mounted on the outside of shell 11, L channel full frequency speaker 12, right channel full range loudspeaking
Device 13, middle/high frequency loudspeaker 14 reach shell 11 by the first mounting hole 111, the second mounting hole 112, third mounting hole 113 respectively
It is interior, L channel full frequency speaker 12, right channel full frequency speaker 13, middle/high frequency loudspeaker 14 can be installed on the outside of shell 11
It is easy for installation onto shell 11, and L channel full frequency speaker 12, right channel full frequency speaker 13, middle/high frequency loudspeaker 14
Side of speaking has mounting base 16 to be blocked, and is conducive to promote exterior aesthetics.
Further, the operation panel 17 that control plays is additionally provided in main body of speaking 1, operation panel 17 is pressed equipped with physics
Key or touch controlled key can be controlled the working condition and sounding of microphone by operation panel 17.In the present embodiment, operation panel 17
The side opposite with the second mounting hole 112 positioned at shell 11, when use, make operation panel 17 opposite with user.Preferably,
Operation panel 17 is detachably arranged on shell 11, is conducive to integral disassembly, assembly.
Power supply is equipped in hand holding handle 3, to raise to L channel full frequency speaker 12, right channel full frequency speaker 13, medium-high frequency
Sound device 14 and control circuit 15 are powered, and power supply is rechargeable battery, are recycled.
Preferably, power supply is cylinder, and the battery compartment of power supply source installation is formed in hand holding handle 3.
It is to be appreciated that above-mentioned each technical characteristic can be used in any combination and unrestricted.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of 2.1 sound channels hold public address microphone, which is characterized in that including hand holding handle (3), main body of speaking (1) and pickup
Device (2)；
The main body of speaking (1) include shell (11), L channel full frequency speaker (12), right channel full frequency speaker (13), in
Tweeter (14) and control circuit (15)；
The first mounting hole (111), the second mounting hole (112), third mounting hole have been sequentially arranged in the circumferential direction. on the shell (11)
(113), and first mounting hole (111), third mounting hole (113) are located at the two opposite sides of the shell (11)；The left side
Sound channel full frequency speaker (12), right channel full frequency speaker (13) are separately mounted to first mounting hole (111), third installation
Hole (113), with from the outside sounding in two opposite sides of the shell (11), the middle/high frequency loudspeaker (14) is mounted on described second
Mounting hole (112)；
The control circuit (15) include pickup circuit (151), full range gain circuitry (152), binary channels full range power amplifier (153),
Mixer circuit (154), intermediate-frequency gain circuit (155), sets power amplifier (156) in monophonic at circuit of high pass filter (157)；
The pickup circuit (151) and the sound pick-up (2) are electrically connected, the full range gain circuitry (152), mixer circuit
(154) it is electrically connected respectively with the pickup circuit (151)；
The binary channels full range power amplifier (153) and the full range gain circuitry (152) are electrically connected, the L channel full range loudspeaking
Device (12), right channel full frequency speaker (13) are electrically connected with the binary channels full range power amplifier (153) respectively, and the binary channels is complete
Frequency power amplifier (153) receives the processed audio signal of the full range gain circuitry (152) and drives the L channel full range loudspeaking
Device (12), right channel full frequency speaker (13) carry out sounding；
The mixer circuit (154) is also electrically connected with the full range gain circuitry (152), the circuit of high pass filter
(157) it is connect with the mixer circuit (154), the intermediate-frequency gain circuit (155) and the circuit of high pass filter (157) are even
It connects, power amplifier (156) is set in the monophonic and the intermediate-frequency gain circuit (155) is electrically connected, the middle/high frequency loudspeaker
(14) and in the monophonic power amplifier (156) electric connection is set, power amplifier (156) is set in the monophonic and receives the full range gain
The processed audio signal of circuit (152) simultaneously drives the middle/high frequency loudspeaker (14) to carry out sounding.
2. 2.1 sound channel according to claim 1 holds public address microphone, which is characterized in that the control circuit (15) is also
Bluetooth including being connected between the pickup circuit (151) and full range gain circuitry (152) receives decoding and DSP processing control
Device (158) processed, to the processing of received audio signal decoding, Xiang Suoshu full range gain circuitry (152) transmission.
3. 2.1 sound channel according to claim 1 or 2 holds public address microphone, which is characterized in that the main body of speaking (1)
It further include respectively for the L channel full frequency speaker (12), right channel full frequency speaker (13), middle/high frequency loudspeaker (14) peace
Three mounting bases (16) of dress are formed with out acoustic aperture (161) in the middle part of each mounting base (16), raise for the L channel full range
Sound device (12), right channel full frequency speaker (13), middle/high frequency loudspeaker (14) are spoken；
The mounting base (16) is removably mounted on the outside of the shell (11), the L channel full frequency speaker (12),
Right channel full frequency speaker (13), middle/high frequency loudspeaker (14) are respectively by first mounting hole (111), the second mounting hole
(112), third mounting hole (113) reaches in the shell (11).
4. 2.1 sound channel according to claim 1 or 2 holds public address microphone, which is characterized in that the main body of speaking (1)
On be additionally provided with control play operation panel (17).
5. 2.1 sound channel according to claim 4 holds public address microphone, which is characterized in that operation panel (17) position
In the side that the shell (11) is opposite with the second mounting hole (112), and the operation panel (17) is removably pacified
On the shell (11).
6. 2.1 sound channel according to claim 1 or 2 holds public address microphone, which is characterized in that in the hand holding handle (3)
Equipped with power supply, with to the L channel full frequency speaker (12), right channel full frequency speaker (13), middle/high frequency loudspeaker (14),
And control circuit (15) power supply.
7. 2.1 sound channel according to claim 6 holds public address microphone, which is characterized in that the power supply is cylinder, institute
State the battery compartment being formed in hand holding handle (3) for power supply installation.
8. 2.1 sound channel according to claim 1 holds public address microphone, which is characterized in that mixer circuit (154) packet
Capacitor C1, C2, C4, resistance R1, R2, R4 are included, one end of operational amplifier U1A, the capacitor C1 connect the full range gain electricity
Road (152), the other end of the capacitor C1 connect one end of the resistance R1, and one end of the capacitor C2 connects the pickup electricity
Road (151), the other end of the capacitor C2 connect one end of the resistance R2, and the second pin of the operational amplifier U1A connects
Meet one end of the other end of the resistance R1, one end of the other end of resistance R2 and capacitor C4, resistance R4, the capacitor C4
The other end, resistance R4 the other end connect with the first pin of the operational amplifier U1A, and with high-pass filter electricity
The third pin of road (157) connection, the operational amplifier U1A connects reference voltage.
9. 2.1 sound channel according to claim 1 holds public address microphone, which is characterized in that the circuit of high pass filter
It (157) include capacitor C3, C6, C7, resistance R6, R7, operational amplifier U1B, the capacitor phase of the capacitor C6 and the capacitor C7
Deng the resistance R6 is equal with the resistance of resistance R7, and one end of the capacitor C6 is connect with the mixer circuit, the other end and institute
State one end of capacitor C7 and one end connection of resistance R7, one end and fortune of the other end of the capacitor C7 and the resistance R6
The 5th pin for calculating amplifier U1B connects, the other end connection reference voltage of the resistance R6, the other end of the resistance R7,
And the 6th pin, the 7th pin of the operational amplifier U1B are connect with one end of the capacitor C3, the capacitor C3's is another
One end is connect with the intermediate-frequency gain circuit (155).
10. 2.1 sound channel according to claim 1 holds public address microphone, which is characterized in that the intermediate-frequency gain circuit
It (155) include resistance R3, R5, capacitor C5, one end and the circuit of high pass filter of operational amplifier U2A, the resistance R3
(157) it connects, one end of the other end of the resistance R3 and the capacitor C5, one end of resistance R5 and operational amplifier U2A
Second pin connection, the third pin of the operational amplifier U2A connects reference voltage, the other end, the electricity of the capacitor C5
First pin of the other end and the operational amplifier U2A that hinder R5, which is connected in the monophonic, sets power amplifier (156).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910664257.XA CN110234052B (en) | 2019-07-23 | 2019-07-23 | 2.1 Sound track hand-held sound-amplifying microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910664257.XA CN110234052B (en) | 2019-07-23 | 2019-07-23 | 2.1 Sound track hand-held sound-amplifying microphone |
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| Publication Number | Publication Date |
|---|---|
| CN110234052A true CN110234052A (en) | 2019-09-13 |
| CN110234052B CN110234052B (en) | 2024-05-17 |
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| CN201910664257.XA Active CN110234052B (en) | 2019-07-23 | 2019-07-23 | 2.1 Sound track hand-held sound-amplifying microphone |
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