CN206472293U - FM anti-jamming circuits built in a kind of sound equipment - Google Patents
FM anti-jamming circuits built in a kind of sound equipment Download PDFInfo
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- CN206472293U CN206472293U CN201720071626.0U CN201720071626U CN206472293U CN 206472293 U CN206472293 U CN 206472293U CN 201720071626 U CN201720071626 U CN 201720071626U CN 206472293 U CN206472293 U CN 206472293U
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Abstract
The utility model discloses FM anti-jamming circuits built in a kind of sound equipment, anti-jamming circuit includes FM chips, common-mode current source module, first LC filtration modules, 2nd LC filtration modules, 3rd LC filtration modules, power frequency input module and antenna input module, external power supply is connected in common-mode current source module, common-mode current source module is connected on the power end of FM chips, first LC filtration modules are connected in the FM output ends of FM chips, 2nd LC filtration modules are connected on the serial ports clock end of FM chips, 3rd LC filtration modules are connected on the serial data end of FM chips, power frequency input module is connected to the power frequency input of FM chips, antenna input module is connected to the antenna input of FM chips.The utility model coordinates multigroup LC filter circuits to be filtered FM signals by common-mode current source module, the interference of the outer bound pair FM radio reception of maximum reduction can be achieved, so as to receive apparent more radio station.
Description
Technical field
The utility model discloses a kind of sound control circuit, FM anti-jamming circuits built in particularly a kind of sound equipment, belongs to sound
Ring technical field.
Background technology
With continuing to develop for multimedia technology and electronics technology, multi-media sound system no longer footpath between fields already in people live
It is raw, using more and more extensive.And with the continuous improvement of people's living standards, people are to each electronic product for being applied in life
Requirement also more and more higher, single electronic product also can not increasingly meet people's psychological needs, functional diversities, comprehensively
Change, the developing direction as electronic product.At present, FM functions are integrated with multi-media sound system, already matching somebody with somebody substantially as sound equipment
Put, the FM functions in sound equipment of the prior art are realized using built-in FM chips, due in outside interference and sound equipment
The electromagnetic interference in portion etc., the FM signals for being are extremely unstable, and radio reception effect is poor, and noise is more, directly affect customer experience, more
Have notably, because noise is excessive so that the FM functions built in sound equipment can not be used, and be performed practically no function.
The content of the invention
For the FM noises built in sound equipment of the prior art mentioned above are more, the shortcoming that uses of influence, this practicality
FM anti-jamming circuits built in a kind of new sound equipment of offer, it is filtered by LC filter circuits to FM signals, and maximum can be achieved
The outer bound pair FM radio reception of reduction interference.
The utility model solve its technical problem use technical scheme be：FM anti-jamming circuits built in a kind of sound equipment, resist
Disturb circuit include FM chips, common-mode current source module, the first LC filtration modules, the 2nd LC filtration modules, the 3rd LC filtration modules,
Power frequency input module and antenna input module, external power supply are connected in common-mode current source module, and common-mode current source module is connected to FM
On the power end of chip, the first LC filtration modules are connected in the FM output ends of FM chips, and the 2nd LC filtration modules are connected to FM
On the serial ports clock end of chip, the 3rd LC filtration modules are connected on the serial data end of FM chips, the connection of power frequency input module
In the power frequency input of FM chips, antenna input module is connected to the antenna input of FM chips.
The technical scheme that the utility model solves the use of its technical problem further comprises：
Described FM chips use model RTC6218 chip.
Described common-mode current source module includes inductance L6, electric capacity C33 and electric capacity C34, and inductance L6 uses two-way inductance, all the way
Be serially connected on positive power line, another road is serially connected on negative power line, electric capacity C33 and electric capacity C34 be connected across respectively positive power line and
On negative power line, electric capacity C34 is connected to inductance L6 front ends, and electric capacity C33 is connected to inductance L6 rear ends.
The first described LC filtration modules include inductance L1, electric capacity C29 and electric capacity C30, and inductance L1 is serially connected in FM output ends
Outlet line on, electric capacity C29 and electric capacity C30 are connected between the outlet line of FM output ends and ground, electric capacity C29 connections
In inductance L1 front ends, electric capacity C30 is connected to inductance L1 rear ends.
The 2nd described LC filtration modules include inductance L9, electric capacity C47 and electric capacity C35, and inductance L9 is serially connected in FM chips
In the input line of serial ports clock end, electric capacity C47 and electric capacity C35 are not connected between the serial ports clock end input line of FM chips and ground,
Electric capacity C47 is connected to inductance L9 front ends, and electric capacity C35 is connected to inductance L9 rear ends.
The build-out resistor R56 that resistance is 1K Ω is serially connected with the serial ports clock end input line of described FM chips.
The 3rd described LC filtration modules include inductance L10, electric capacity C46 and electric capacity C39, and inductance L10 is serially connected in FM chips
Serial data end input line on, electric capacity C46 and electric capacity C39 are not connected to the serial data end input line and ground of FM chips
Between, electric capacity C46 is connected to inductance L10 front ends, and electric capacity C39 is connected to inductance L10 rear ends.
The build-out resistor R57 that resistance is 1K Ω is serially connected with the serial data end input line of described FM chips.
Described power frequency input module includes inductance L8, resistance R18 and electric capacity C32, and electric capacity C 32 is connected to power frequency component
Between input interface and ground, inductance L8 and resistance R18 are connected in series in the power frequency input of power frequency component input interface and FM chips
Between end.
Described antenna input module includes inductance L5, inductance L11 and electric capacity C108, and inductance L5 is connected to antenna input and connect
Between mouth and ground, inductance L11 and electric capacity C108 are connected in series between the antenna input of antenna input interface and FM chips.
The beneficial effects of the utility model are：The utility model coordinates multigroup LC filter circuits pair by common-mode current source module
FM signals are filtered, and the interference of the outer bound pair FM radio reception of maximum reduction can be achieved, so as to receive apparent more electricity
Platform.
The utility model is described further below in conjunction with the drawings and specific embodiments.
Brief description of the drawings
Fig. 1 is the utility model circuit block diagram.
Fig. 2 is the utility model circuit theory diagrams.
Embodiment
The present embodiment is the utility model preferred embodiment, and other all its principle and basic structure are identical with the present embodiment
Or approximate, within the utility model protection domain.
Incorporated by reference to referring to accompanying drawing 1 and accompanying drawing 2, the utility model mainly includes FM chips, common-mode current source module, the first LC filters
Ripple module, the 2nd LC filtration modules, the 3rd LC filtration modules, power frequency input module and antenna input module, external power supply connection
In common-mode current source module, common-mode current source module is connected on the power end of FM chips, and the first LC filtration modules are connected to FM cores
In the FM output ends of piece, FM output interfaces are connected with the first LC filtration modules, for exporting FM signals to loudspeaker, the 2nd LC
Filtration module is connected on the serial ports clock end of FM chips, and interface clock signal, the 3rd LC are connected with the 2nd LC filtration modules
Filtration module is connected on the serial data end of FM chips, and data signal interfaces are connected with the 3rd LC filtration modules, by when
Clock signaling interface and data signal interfaces can realize that IIC serial ports input digital FM signal gives FM chips.In the present embodiment, power frequency is defeated
Enter the power frequency input that module is connected to FM chips, clock signal is provided for FM chips, antenna input module is connected to FM chips
Antenna input, be connected with antenna on antenna input module, the input for FM signals.
In the present embodiment, FM chips use model RTC6218 chip, when it is implemented, same work(can also be used
Other model chips of energy are replaced.
In the present embodiment, external power supply uses 3.3V power supplys, and common-mode current source module includes inductance L6, electric capacity C33 and electric capacity
C34, inductance L6 use two-way inductance, be serially connected in all the way on positive power line, another road is serially connected on negative power line, electric capacity C33 and
Electric capacity C34 is connected across on positive power line and negative power line respectively, and electric capacity C34 is connected to inductance L6 front ends（Come relative to positive current
Say）, electric capacity C33 is connected to inductance L6 rear ends.
In the present embodiment, the first LC filtration modules include inductance L1, electric capacity C29 and electric capacity C30, and it is defeated that inductance L1 is serially connected in FM
Go out on the outlet line at end, electric capacity C29 and electric capacity C30 are connected between the outlet line of FM output ends and ground, electric capacity C29
It is connected to inductance L1 front ends（For signal trend）, electric capacity C30 is connected to inductance L1 rear ends.
In the present embodiment, the 2nd LC filtration modules include inductance L9, electric capacity C47 and electric capacity C35, and inductance L9 is serially connected in FM cores
In the serial ports clock end input line of piece, electric capacity C47 and electric capacity C35 are not connected to the serial ports clock end input line and ground of FM chips
Between, electric capacity C47 is connected to inductance L9 front ends, and electric capacity C35 is connected to inductance L9 rear ends.In the present embodiment, in the serial ports of FM chips
The build-out resistor R56 that resistance is 1K Ω is also serially connected with the input line of clock end.
In the present embodiment, the 3rd LC filtration modules include inductance L10, electric capacity C46 and electric capacity C39, and inductance L10 is serially connected in FM
In the serial data end input line of chip, electric capacity C46 and electric capacity C39 are not connected to the serial data end input line and ground of FM chips
Between, electric capacity C46 is connected to inductance L10 front ends, and electric capacity C39 is connected to inductance L10 rear ends.In the present embodiment, in FM chips
The build-out resistor R57 that resistance is 1K Ω is also serially connected with the input line of serial data end.
In the present embodiment, power frequency input module includes inductance L8, resistance R18 and electric capacity C32, and electric capacity C 32 is connected to power frequency
Between signal input interface and ground, inductance L8 and resistance R18 are connected in series in the power frequency of power frequency component input interface and FM chips
Between input.
In the present embodiment, antenna input module includes inductance L5, inductance L11 and electric capacity C108, and inductance L5 is connected to antenna
Between input interface and ground, inductance L11 and electric capacity C108 are connected in series in the antenna input of antenna input interface and FM chips
Between, antenna input interface is used to connect antenna.
The utility model coordinates multigroup LC filter circuits to be filtered FM signals by common-mode current source module, can be achieved most
The interference of the outer bound pair FM radio reception of big reduction, so as to receive apparent more radio station.
Claims (10)
1. FM anti-jamming circuits built in a kind of sound equipment, it is characterized in that：Described anti-jamming circuit includes FM chips, common-mode current source
Module, the first LC filtration modules, the 2nd LC filtration modules, the 3rd LC filtration modules, power frequency input module and antenna input module,
External power supply is connected in common-mode current source module, and common-mode current source module is connected on the power end of FM chips, the first LC filtering moulds
Block is connected in the FM output ends of FM chips, and the 2nd LC filtration modules are connected on the serial ports clock end of FM chips, the 3rd LC filters
Ripple module is connected on the serial data end of FM chips, and power frequency input module is connected to the power frequency input of FM chips, and antenna is defeated
Enter the antenna input that module is connected to FM chips.
2. FM anti-jamming circuits built in sound equipment according to claim 1, it is characterized in that：Described FM chips use model
For RTC6218 chip.
3. FM anti-jamming circuits built in sound equipment according to claim 1, it is characterized in that：Described common-mode current source module bag
Inductance L6, electric capacity C33 and electric capacity C34 are included, inductance L6 uses two-way inductance, is serially connected in all the way on positive power line, another road concatenation
On negative power line, electric capacity C33 and electric capacity C34 are connected across on positive power line and negative power line respectively, and electric capacity C34 is connected to inductance
L6 front ends, electric capacity C33 is connected to inductance L6 rear ends.
4. FM anti-jamming circuits built in sound equipment according to claim 1, it is characterized in that：The first described LC filtration modules
Including inductance L1, electric capacity C29 and electric capacity C30, inductance L1 is serially connected on the outlet line of FM output ends, electric capacity C29 and electric capacity C30
It is connected between the outlet line of FM output ends and ground, electric capacity C29 is connected to inductance L1 front ends, electric capacity C30 is connected to electricity
Feel L1 rear ends.
5. FM anti-jamming circuits built in sound equipment according to claim 1, it is characterized in that：The 2nd described LC filtration modules
Including inductance L9, electric capacity C47 and electric capacity C35, inductance L9 is serially connected in the serial ports clock end input line of FM chips, electric capacity C47 and
Electric capacity C35 is not connected between the serial ports clock end input line of FM chips and ground, and electric capacity C47 is connected to inductance L9 front ends, electric capacity
C35 is connected to inductance L9 rear ends.
6. FM anti-jamming circuits built in sound equipment according to claim 1, it is characterized in that：During the serial ports of described FM chips
The build-out resistor R56 that resistance is 1K Ω is serially connected with the input line of clock end.
7. FM anti-jamming circuits built in sound equipment according to claim 1, it is characterized in that：The 3rd described LC filtration modules
Including inductance L10, electric capacity C46 and electric capacity C39, inductance L10 is serially connected in the serial data end input line of FM chips, electric capacity C46
And electric capacity C39 is not connected between the serial data end input line of FM chips and ground, electric capacity C46 is connected to inductance L10 front ends, electricity
Hold C39 and be connected to inductance L10 rear ends.
8. FM anti-jamming circuits built in sound equipment according to claim 1, it is characterized in that：The serial ports number of described FM chips
The build-out resistor R57 that resistance is 1K Ω is serially connected with input line according to holding.
9. FM anti-jamming circuits built in sound equipment according to claim 1, it is characterized in that：Described power frequency input module bag
Inductance L8, resistance R18 and electric capacity C32 are included, electric capacity C 32 is connected between power frequency component input interface and ground, inductance L8 and resistance
R18 is connected in series between power frequency component input interface and the power frequency input of FM chips.
10. FM anti-jamming circuits built in sound equipment according to claim 1, it is characterized in that：Described antenna input module bag
Inductance L5, inductance L11 and electric capacity C108 are included, inductance L5 is connected between antenna input interface and ground, inductance L11 and electric capacity C108
Between the antenna input for being connected in series in antenna input interface and FM chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720071626.0U CN206472293U (en) | 2017-01-20 | 2017-01-20 | FM anti-jamming circuits built in a kind of sound equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720071626.0U CN206472293U (en) | 2017-01-20 | 2017-01-20 | FM anti-jamming circuits built in a kind of sound equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206472293U true CN206472293U (en) | 2017-09-05 |
Family
ID=59706527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720071626.0U Expired - Fee Related CN206472293U (en) | 2017-01-20 | 2017-01-20 | FM anti-jamming circuits built in a kind of sound equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206472293U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809506A (en) * | 2017-11-23 | 2018-03-16 | 广东欧珀移动通信有限公司 | Anti-jamming circuit structure and mobile terminal |
| CN107959737A (en) * | 2017-11-23 | 2018-04-24 | 广东欧珀移动通信有限公司 | Anti-jamming circuit structure and mobile terminal |
| CN111818424A (en) * | 2019-04-12 | 2020-10-23 | 上海擎感智能科技有限公司 | Audio playing circuit |
-
2017
- 2017-01-20 CN CN201720071626.0U patent/CN206472293U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809506A (en) * | 2017-11-23 | 2018-03-16 | 广东欧珀移动通信有限公司 | Anti-jamming circuit structure and mobile terminal |
| CN107959737A (en) * | 2017-11-23 | 2018-04-24 | 广东欧珀移动通信有限公司 | Anti-jamming circuit structure and mobile terminal |
| CN107809506B (en) * | 2017-11-23 | 2020-09-15 | Oppo广东移动通信有限公司 | Anti-interference circuit structure and mobile terminal |
| CN111818424A (en) * | 2019-04-12 | 2020-10-23 | 上海擎感智能科技有限公司 | Audio playing circuit |
| CN111818424B (en) * | 2019-04-12 | 2024-10-01 | 上海擎感智能科技有限公司 | Audio playing circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170905 Termination date: 20190120 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |