CN205754814U - A kind of computer is for the car microphone control circuit of cargo vehicle - Google Patents
A kind of computer is for the car microphone control circuit of cargo vehicle Download PDFInfo
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- CN205754814U CN205754814U CN201620448452.0U CN201620448452U CN205754814U CN 205754814 U CN205754814 U CN 205754814U CN 201620448452 U CN201620448452 U CN 201620448452U CN 205754814 U CN205754814 U CN 205754814U
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Abstract
A kind of computer, for the car microphone control circuit of cargo vehicle, relates to car microphone technical field.Including sound collection circuit, amp gain circuit, noise filter circuit and voltage counnter attack protection circuit；Sound collection circuit, amp gain circuit, noise filter circuit, audio signal output circuit are sequentially connected with; voltage method protection circuit it is connected between power circuit with amp gain circuit; effectively reduce driver's cabin internal interference and noise, its have simple in construction, reasonable in design, be easily installed.
Description
Technical field
This utility model relates to car microphone technical field, is used for the car microphone control circuit of cargo vehicle particularly to a kind of computer.
Background technology
Car microphone is as a part for vehicular automotive electronic device, it is adaptable to on-vehicle hand-free system, car phone, has the function that pickup is amplified, met driver's call.Development along with car entertainment information system, it is contemplated that driver takes the hidden danger of mobile phone on the run, and middle and high end car is fitted with mike.
Car microphone is applied more on car, but the most rarely found on cargo vehicle.Cargo vehicle is different with car electrical system, and test standard exists difference.The traveling road conditions of cargo vehicle are typically good not as car, and its vibration insulating system is not so good as car, add that engine displacement is relatively big, so that driver's cabin internal interference is more, noise is bigger.
Summary of the invention
For solving above-mentioned technical problem, the utility model proposes a kind of computer car microphone control circuit for cargo vehicle, its simple in construction, reasonable in design, easy to maintenance.
This utility model be the technical scheme is that a kind of computer car microphone control circuit for cargo vehicle; including power circuit and audio signal output circuit, it is characterized in that: this control circuit also includes sound collection circuit, amp gain circuit, noise filter circuit and voltage counnter attack protection circuit；Sound collection circuit, amp gain circuit, noise filter circuit, audio signal output circuit are sequentially connected with, and are connected voltage method protection circuit between power circuit with amp gain circuit, and power circuit is also connected with noise filter circuit.
Sound collection circuit is connected with gain amplifier circuit, including electret microphone, polarized electric capacity, the first resistance, the 5th electric capacity and the 6th electric capacity, the positive pole of electret microphone connects the 6th electric capacity one end, first resistance one end and the 5th electric capacity one end, ground connection after electret microphone negative pole and the connection of the 5th electric capacity other end, the other end of the first resistance connects the positive pole of polarized electric capacity, and the negative pole of polarized electric capacity connects digitally.
nullGain amplifier circuit is connected with noise filter circuit and voltage counnter attack protection circuit，Including the second resistance、3rd resistance、4th resistance、6th resistance、First audion、Second audion、Second electric capacity、3rd electric capacity、4th electric capacity and the 7th electric capacity，The 6th electric capacity other end connects second resistance one end、6th resistance one end、Second electric capacity one end、7th electric capacity one end and the base stage of the first audion，The other end of the second resistance connects one end and the positive pole of polarized electric capacity of the 3rd resistance，The other end of the 3rd resistance connects the other end of the second electric capacity、The emitter stage of the first audion and one end of the 4th resistance，3rd electric capacity and the 4th resistor coupled in parallel，The other end of the 4th resistance connects one end and the colelctor electrode of the second audion of the 4th electric capacity，The other end of the 4th electric capacity connects the base stage of the second audion，The emitter stage of the second audion connects digitally.
Voltage counnter attack protection circuit includes that the 3rd audion, the base stage of the 3rd audion are connected with the colelctor electrode of the first audion, the base stage of the second audion, and the colelctor electrode of the 3rd audion connects digitally, and the emitter stage of the 3rd audion connects the colelctor electrode of the second diode.
Noise filter circuit includes that the 9th electric capacity, the 9th electric capacity one end connect the other end of the 4th resistance, and another termination of the 9th electric capacity is digitally.
Advantage of the present utility model and providing the benefit that: this cargo vehicle car microphone control circuit, including sound collection circuit, amp gain circuit, noise filter circuit and voltage counnter attack protection circuit；Sound collection circuit, amp gain circuit, noise filter circuit, audio signal output circuit are sequentially connected with; voltage method protection circuit it is connected between power circuit with amp gain circuit; effectively reduce driver's cabin internal interference and noise, its have simple in construction, reasonable in design, be easily installed.
Accompanying drawing explanation
It is further described in detail originally executing mode below in conjunction with accompanying drawing.
Fig. 1 is cargo vehicle car microphone control circuit block diagram of the present utility model；
Fig. 2 is this utility model cargo vehicle car microphone control circuit schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings 1～2 and detailed description of the invention this utility model is elaborated, below describe be only used as demonstration and explain, this utility model is not made any pro forma restriction.
Cargo vehicle in the present embodiment car microphone control circuit, including sound collection circuit 1, amp gain circuit 2, noise filter circuit 3, audio signal output circuit 4, voltage counnter attack protection circuit 5 and power circuit 6.Sound collection circuit 1, amp gain circuit 2, noise filter circuit 3, audio signal output circuit 4 are sequentially connected with, and are connected voltage method protection circuit 5 between power circuit 6 with amp gain circuit 2, and power circuit 6 is also connected with noise filter circuit 3.
Sound collection circuit 1 is connected with gain amplifier circuit 2, including electret microphone, polarized electric capacity C1, resistance R1, electric capacity C5 and electric capacity C6, the positive pole of electret microphone connects electric capacity R6 one end, resistance R1 one end and electric capacity C5 one end, electret microphone negative pole be connected with the electric capacity R5 other end after ground connection, the other end of resistance R1 connects the positive pole of polarized electric capacity C1, and the negative pole of polarized electric capacity C1 connects digitally.
nullGain amplifier circuit 2 is connected with noise filter circuit 3 and voltage counnter attack protection circuit 5，Acoustoelectric signal for being transmitted electret microphone is amplified，Including resistance R2、Resistance R3、Resistance R4、Resistance R6、Audion Q1、Audion Q2、Electric capacity C2、Electric capacity C3、Electric capacity C4 and electric capacity C7，The electric capacity C6 other end connects resistance R2 one end、Resistance R6 one end、Electric capacity C2 one end、Electric capacity C7 one end and the base stage of audion Q1，The other end of resistance R2 connects one end and the positive pole of polarized electric capacity C1 of resistance R3，The other end of resistance R3 connects the other end of electric capacity C2、The emitter stage of audion Q1 and one end of resistance R4，Electric capacity C3 is in parallel with resistance R4，The other end of resistance R4 connects one end and the colelctor electrode of audion Q2 of electric capacity C4，The base stage of the other end connecting triode Q2 of electric capacity C4，The emitter stage of audion Q2 connects digitally.
Voltage counnter attack protection circuit 5 can resist voltage pulsation and electric voltage reverse-connection.Including audion Q3, the base stage of audion Q3 is connected with colelctor electrode, the base stage of audion Q2 of audion Q1, and the colelctor electrode of audion Q3 connects digitally, and the emitter stage of audion Q3 connects the colelctor electrode of diode Q2.
Noise filter circuit 3 contributes to filtering noise jamming, connects the other end of resistance R4 including electric capacity C9, electric capacity C9 one end, and another termination of electric capacity C9 is digitally.
Sound carries out acoustic-electric conversion through electret microphone, after the signal of telecommunication is amplified to, by amplifier, the amplitude that car-mounted terminal is suitable for process, through overcoupling electric capacity output AC signal to car-mounted terminal.The peripheral circuit that car-mounted terminal provides must match with microphone circuit.
The present embodiment selects certain unidirectional electret capacitor microphone, when test condition frequency f=1 kHz, atmospheric pressure Pin=1 Pa, distance are 50 cm, corresponding performance indications are as follows: sensitivity is-49 ~-45 dB, output impedance≤2.2 k Ω, reverse attenuation >=16 dB, operating current≤500 A, signal to noise ratio S/N >=60, input maximum sound pressure≤104 dB, (THD ＜ 1 %), ENL≤36 dB(A).
Although the foregoing describing detailed description of the invention of the present utility model, but the those skilled in the art in this area are to be understood that, these are merely illustrative of, and these embodiments can be made various changes or modifications, without departing from principle of the present utility model and essence.Scope of the present utility model is only limited by the claims that follow.
Claims (5)
1. a computer is for the car microphone control circuit of cargo vehicle; including power circuit and audio signal output circuit, it is characterised in that: this control circuit also includes sound collection circuit, amp gain circuit, noise filter circuit and voltage counnter attack protection circuit；Sound collection circuit, amp gain circuit, noise filter circuit, audio signal output circuit are sequentially connected with, and are connected voltage method protection circuit between power circuit with amp gain circuit, and power circuit is also connected with noise filter circuit.
A kind of computer the most as claimed in claim 1 is for the car microphone control circuit of cargo vehicle, it is characterized in that: sound collection circuit is connected with gain amplifier circuit, including electret microphone, polarized electric capacity, the first resistance, the 5th electric capacity and the 6th electric capacity, the positive pole of electret microphone connects the 6th electric capacity one end, first resistance one end and the 5th electric capacity one end, ground connection after electret microphone negative pole and the connection of the 5th electric capacity other end, the other end of the first resistance connects the positive pole of polarized electric capacity, and the negative pole of polarized electric capacity connects digitally.
nullA kind of computer the most as claimed in claim 2 is for the car microphone control circuit of cargo vehicle，It is characterized in that: gain amplifier circuit is connected with noise filter circuit and voltage counnter attack protection circuit，Including the second resistance、3rd resistance、4th resistance、6th resistance、First audion、Second audion、Second electric capacity、3rd electric capacity、4th electric capacity and the 7th electric capacity，The 6th electric capacity other end connects second resistance one end、6th resistance one end、Second electric capacity one end、7th electric capacity one end and the base stage of the first audion，The other end of the second resistance connects one end and the positive pole of polarized electric capacity of the 3rd resistance，The other end of the 3rd resistance connects the other end of the second electric capacity、The emitter stage of the first audion and one end of the 4th resistance，3rd electric capacity and the 4th resistor coupled in parallel，The other end of the 4th resistance connects one end and the colelctor electrode of the second audion of the 4th electric capacity，The other end of the 4th electric capacity connects the base stage of the second audion，The emitter stage of the second audion connects digitally.
A kind of computer the most as claimed in claim 3 is for the car microphone control circuit of cargo vehicle; it is characterized in that: voltage counnter attack protection circuit includes the 3rd audion; the base stage of the 3rd audion is connected with the colelctor electrode of the first audion, the base stage of the second audion; the colelctor electrode of the 3rd audion connects digitally, and the emitter stage of the three or three pole connects the colelctor electrode of the second diode.
A kind of computer the most as claimed in claim 3 is for the car microphone control circuit of cargo vehicle, it is characterised in that: noise filter circuit includes that the 9th electric capacity, the 9th electric capacity one end connect the other end of the 4th resistance, and another termination of the 9th electric capacity is digitally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620448452.0U CN205754814U (en) | 2016-05-17 | 2016-05-17 | A kind of computer is for the car microphone control circuit of cargo vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620448452.0U CN205754814U (en) | 2016-05-17 | 2016-05-17 | A kind of computer is for the car microphone control circuit of cargo vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205754814U true CN205754814U (en) | 2016-11-30 |
Family
ID=57364580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620448452.0U Expired - Fee Related CN205754814U (en) | 2016-05-17 | 2016-05-17 | A kind of computer is for the car microphone control circuit of cargo vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205754814U (en) |
-
2016
- 2016-05-17 CN CN201620448452.0U patent/CN205754814U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 Termination date: 20170517 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |