CN207691821U - A kind of FM broadcast singals adapter - Google Patents
A kind of FM broadcast singals adapter Download PDFInfo
- Publication number
- CN207691821U CN207691821U CN201721483326.XU CN201721483326U CN207691821U CN 207691821 U CN207691821 U CN 207691821U CN 201721483326 U CN201721483326 U CN 201721483326U CN 207691821 U CN207691821 U CN 207691821U
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- resistance
- capacitance
- triode
- amplifier
- relay
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Abstract
The utility model provides a kind of FM broadcast singals adapter, it is characterised in that：Including RC filter circuits and rf signal amplification circuit, it is arranged between telephone audio input terminal and main control chip；The RC filter circuits include RC low-pass filter circuits and RC high-pass filtering circuits；The low-pass filter circuit includes first resistor R1 and the first capacitance C1；The high-pass filtering circuit includes the second capacitance C2 and 3rd resistor R3.Compared with prior art, the interference to radio circuit or other circuits is reduced, solves the problems, such as the electromagnetic interference to radiofrequency signal when equipment is made a phone call.
Description
Technical field
The utility model is related to a kind of FM broadcast singals adapters, more particularly to a kind of intermediate frequency broadcast electromagnetism interference neck
The FM broadcast singal adapters in domain.
Background technology
Existing FM broadcast singals adapter such as broadcasts village of village and rings equipment mostly using analogue technique, transmission mode list
One, generate that the period is long, and system network design is complex, signal interference illegal intercut problem and is difficult to solve.
When equipment has been in normal broadcast, the phone built in equipment is dialed, before closing of the circuit produced by phone module
Interference components（Electromagnetic wave, current sound etc.）It can be transferred directly to radio-frequency modulations output end by circuit, pass through terminal device institute
The typhon connect plays back, and directly affects normal broadcast content and disturbs residents.
It when equipment has been in normal broadcast, does not make a phone call, phone module is also constantly in signal search state, works as electricity
When words search multipath interference signal, phone module meeting output current interference signal influences normal broadcast quality.
With the reform great development of " 13 " Culture of Planning, in recent years 5.20,4.20 violent earthquake, emergency information channel is deficient
Weary, disaster area information is difficult to propagate outward at the first time, and each province and city Radio, Film and Television Administration is in sides such as policy propaganda, emergency command, information reports
Face will all play a positive role, how effectively to solve existing FM broadcast singals when present in radiofrequency signal electromagnetic interference problem at
For technical problem urgently to be resolved hurrily.
Utility model content
The technical problems to be solved in the utility model is：One kind is provided to can effectively solve the problem that when equipment is made a phone call to radio frequency
The electromagnetic interference of signal, FM broadcast singal adapters.
The technical solution adopted in the utility model is as follows：A kind of FM broadcast singals adapter, it is characterised in that：It is filtered including RC
Wave circuit and rf signal amplification circuit are arranged between telephone audio input terminal and main control chip；The RC filter circuits packet
Include RC low-pass filter circuits and RC high-pass filtering circuits；The low-pass filter circuit includes first resistor R1 and the first capacitance C1；
The high-pass filtering circuit includes the second capacitance C2 and 3rd resistor R3；
The first resistor R1 passes sequentially through the second capacitance C2 and the 5th resistance R5 is connected with one end of the 6th resistance R6；The
One capacitance C1 and second resistance R2 is in parallel, and one end is connected between first resistor R1 and the second capacitance C2, and the other end is connected to the
The anode of six capacitance C6；The 6th capacitance C6 and third capacitance C3 earths；One end of 4th capacitance C4 is connected to second
The other end of resistance R2, the other end are connected with one end of the 4th resistance R4；The other end of the 4th resistance R4 is connected to the 5th
Between resistance R5 and the 6th resistance R6；5th capacitance C5 and 3rd resistor R3 are in parallel, and one end is connected to the second capacitance C2 and the 5th
Between resistance R5, the other end is connected between the 4th capacitance C4 and the 4th resistance R4；
The other end of 6th resistance R6 is connected with one section of the 7th resistance R7 and the 8th resistance R8 respectively；7th resistance R7 according to
The secondary input positive terminal that amplifier U is connected to by the 7th capacitance C7 and the 9th resistance R9；8th resistance R8 passes sequentially through the 8th electricity
Hold the input negative terminal that C8 and the tenth resistance R10 is connected to amplifier U, the output end of the amplifier U is connected to main control chip.
Further include Active RC low-pass filter, including the 14th resistance R14 in parallel and the 9th capacitance C9, one end are connected to
The input negative terminal of amplifier U, the other end are connected to the output end of amplifier U.
Further include relay circuit, including the first triode Q1, the second triode Q2 and relay JDQ；The relay
The normally opened contact of JDQ is connected to radio-frequency modulations module by the 19th capacitance C19；The normally-closed contact of the relay JDQ is in
Heart contact short circuit is connected to the output end of amplifier U；The coil connecting terminal anode of the relay JDQ and the first triode Q1's
Collector is connected, and the base stage of the first triode Q1 is connected to the collector of the second triode, and passes through the 21st resistance
R21 is connected to VCC, and emitter is connected to GND；The emitter of the second triode Q2 is connected to GND, and base stage passes through the 20th
Resistance R20 is connected to an I/O port of main control chip；Further include in parallel the 20th capacitance C20 and the 22nd resistance R22, one
End is connected to radio-frequency modulations module, and the other end is connected to GND.
Further include third transistor Q3,
Base stage is connected to an I/O port of main control chip by the 17th resistance R17, this I/O port and the 20th resistance R20 connect
The I/O port connect is different I/O port；
Emitter is connected to GND；
On the one hand base stage passes sequentially through the output that the 15th resistance R15 and the 21st capacitance C21 is connected to amplifier U
End, on the other hand passes sequentially through the 15th capacitance C15, the 19th resistance R19 and the 17th capacitance C17 and is connected to relay JDQ
Normally-closed contact；Further include the 16th resistance R16 and the 14th capacitance C14 of parallel connection, one end is connected to third transistor Q3's
Collector, the other end are connected to GND.
Phone module power supply and phone module ground connection are with audio and radio circuit part using independently-powered and ground connection.
The relay uses tq2-5V relays.
Compared with prior art, the utility model has the beneficial effects that：
1, RC filter circuits filter low, high frequency division caused by phone module by RC low-pass filtering and RC high-pass filterings
Amount, reduces the interference to radio circuit or other circuits；
2, phone module power supply and phone module ground connection use independently-powered and ground connection with audio and radio circuit part,
Prevent interference signal by power supply and be transferred to audio and radio circuit；
3, the Active RC low-pass filter circuit of amplification circuits is further reduced to radio circuit or other circuits
Interference；
4, when the interference signal of leakage is transferred to relay, due to adding relay contact to be usually in normally open, therefore
Interference signal cannot pass through；
When 5, without telephone-broadcast, third transistor Q3 is in saturation state, and interference components are direct caused by phone module
To ground.
Description of the drawings
Fig. 1 is the principle schematic of the utility model wherein embodiment.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only explaining this
Utility model is not used to limit the utility model.
This specification（Including any abstract and attached drawing）Disclosed in any feature unless specifically stated can be by other
Equivalent or with similar purpose alternative features are replaced.That is, unless specifically stated, each feature is a series of equivalent
An or example in similar characteristics.
Specific embodiment 1
As shown in Figure 1, a kind of FM broadcast singals adapter, including RC filter circuits and rf signal amplification circuit, setting
Between telephone audio input terminal and main control chip；The RC filter circuits include RC low-pass filter circuits and RC high-pass filtering electricity
Road；The low-pass filter circuit includes first resistor R1 and the first capacitance C1；The high-pass filtering circuit includes the second capacitance C2
With 3rd resistor R3；
The first resistor R1 passes sequentially through the second capacitance C2 and the 5th resistance R5 is connected with one end of the 6th resistance R6；The
One capacitance C1 and second resistance R2 is in parallel, and one end is connected between first resistor R1 and the second capacitance C2, and the other end is connected to the
The anode of six capacitance C6；The 6th capacitance C6 and third capacitance C3 earths；One end of 4th capacitance C4 is connected to second
The other end of resistance R2, the other end are connected with one end of the 4th resistance R4；The other end of the 4th resistance R4 is connected to the 5th
Between resistance R5 and the 6th resistance R6；5th capacitance C5 and 3rd resistor R3 are in parallel, and one end is connected to the second capacitance C2 and the 5th
Between resistance R5, the other end is connected between the 4th capacitance C4 and the 4th resistance R4；
The other end of 6th resistance R6 is connected with one section of the 7th resistance R7 and the 8th resistance R8 respectively；7th resistance R7 according to
The secondary input positive terminal that amplifier U is connected to by the 7th capacitance C7 and the 9th resistance R9；8th resistance R8 passes sequentially through the 8th electricity
Hold the input negative terminal that C8 and the tenth resistance R10 is connected to amplifier U, the output end of the amplifier U is connected to main control chip.
In this embodiment, RC filter circuits filter phone module by RC low-pass filtering and RC high-pass filterings and are produced
Raw low, high fdrequency component, to reduce the interference to radio circuit or other circuits.
Specific embodiment 2
Further include Active RC low-pass filter on the basis of specific embodiment 1, including the 14th resistance R14 in parallel
With the 9th capacitance C9, one end is connected to the input negative terminal of amplifier U, and the other end is connected to the output end of amplifier U.
Specific embodiment 3
Further include relay circuit, including the first triode Q1, the second triode on the basis of specific embodiment 1 or 2
Q2 and relay JDQ；The normally opened contact of the relay JDQ is connected to radio-frequency modulations module by the 19th capacitance C19；It is described
The normally-closed contact and central contact short circuit of relay JDQ are connected to the output end of amplifier U；The coil of the relay JDQ connects
It connects proper pole with the collector of the first triode Q1 to be connected, the base stage of the first triode Q1 is connected to the collection of the second triode
Electrode, and VCC is connected to by the 21st resistance R21, emitter is connected to GND；The emitter of the second triode Q2
It is connected to GND, base stage is connected to an I/O port of main control chip by the 20th resistance R20；It further include the 20th electricity of parallel connection
Hold C20 and the 22nd resistance R22, one end is connected to radio-frequency modulations module, and the other end is connected to GND.
When without telephone-broadcast, when the interference signal of leakage is transferred to relay, since the second triode Q2 ground levels are height
Level, the first triode Q1 ground levels be low level, the first triode Q1 current collections extremely high level, relay coil wiring both ends without
Voltage difference, relay do not work, due to relay normally open and intermediate contact（7,8 foot）It is usually in normally open, therefore interferes letter
Number it cannot pass through；When there is telephone-broadcast, main control chip I/O port exports low level and passes through the 20th resistance R20 to the second triode
Q2 ground levels, the second triode Q2 are in cut-off state, and the first triode Q1 ground levels are high level, and the first triode Q1 current collections are extremely
There are voltage difference, relay work, since relay contact is normally opened and intermediate contact in low level, relay coil wiring both ends（7、8
Foot）It is now in normally off, telephone-broadcast audio passes through RC（R22、C20）Composition filter network is transmitted to radio-frequency modulations portion
Point, complete telephone audio output broadcast.
Specific embodiment 4
Further include third transistor Q3 on the basis of specific embodiment 3,
Base stage is connected to an I/O port of main control chip by the 17th resistance R17, this I/O port and the 20th resistance R20 connect
The I/O port connect is different I/O port；
Emitter is connected to GND；
On the one hand base stage passes sequentially through the output that the 15th resistance R15 and the 21st capacitance C21 is connected to amplifier U
End, on the other hand passes sequentially through the 15th capacitance C15, the 19th resistance R19 and the 17th capacitance C17 and is connected to relay JDQ
Normally-closed contact；Further include the 16th resistance R16 and the 14th capacitance C14 of parallel connection, one end is connected to third transistor Q3's
Collector, the other end are connected to GND.
When without telephone-broadcast, third transistor Q3 ground levels are high level, and third transistor Q3 is in saturation state, collector
It is conducting to ground with emitting stage, interference components pass through RC filter circuits and rf signal amplification circuit part caused by phone module
Signal just directly arrives ground to this after filter and amplification.Prevent interference components transmission radio circuit or other circuits；When there is phone wide
Sowing time, main control chip I/O port export low level and are in cut-off state by R17 to third transistor ground level, third transistor Q3,
Telephone-broadcast audio passes through RC（R15、R16、C14、C15）Composition filter network is transmitted to relay.
Specific embodiment 5
On the basis of one of specific embodiment 1 to 4, phone module power supply and phone module ground connection with audio and radio frequency
Circuit part using it is independently-powered and ground connection, prevent interference signal by power supply and be transferred to audio and radio circuit.
Specific embodiment 6
On the basis of one of specific embodiment 1 to 5, in this embodiment, the relay using tq2-5V after
Electric appliance.
When no telephone-broadcast, the voltage that main control chip is output to triode Q3 ground levels is high level, and triode is operated in
Saturation state is transmitted through the interference components come and directly arrives ground, even if there is the component of leakage since main control chip is output to triode
The voltage of Q2 ground levels is high level, and relay does not work, and interference signal can not leak into other circuits and radio circuit, pass through
Single independently-powered, independent floor file, multiple-stage filtering isolation processing, electromagnetic interference caused by the effective solution equipment phone are asked
Topic.
When there is telephone-broadcast, the voltage that main control chip is output to triode Q3 ground levels is low level, and triode is operated in
Cut-off state, the voltage for being output to triode Q2 ground levels are low level, and relay work is transmitted through the phone audio signal warp come
Filter network directly arrives radio-frequency modulations part, telephone audio letter modulation output broadcast is completed, due to by single independently-powered, independent
Floor file, multiple-stage filtering isolation processing technology and extensive application practical proof, this circuit design is successful.
Claims (6)
1. a kind of FM broadcast singals adapter, it is characterised in that：Including RC filter circuits and rf signal amplification circuit, setting exists
Between telephone audio input terminal and main control chip；The RC filter circuits include RC low-pass filter circuits and RC high-pass filtering electricity
Road；The low-pass filter circuit includes first resistor R1 and the first capacitance C1；The high-pass filtering circuit includes the second capacitance C2
With 3rd resistor R3；
The first resistor R1 passes sequentially through the second capacitance C2 and the 5th resistance R5 is connected with one end of the 6th resistance R6；First electricity
Hold C1 and second resistance R2 is in parallel, one end is connected between first resistor R1 and the second capacitance C2, and the other end is connected to the 6th electricity
Hold the anode of C6；The 6th capacitance C6 and third capacitance C3 earths；One end of 4th capacitance C4 is connected to second resistance
The other end of R2, the other end are connected with one end of the 4th resistance R4；The other end of the 4th resistance R4 is connected to the 5th resistance
Between R5 and the 6th resistance R6；5th capacitance C5 and 3rd resistor R3 are in parallel, and one end is connected to the second capacitance C2 and the 5th resistance
Between R5, the other end is connected between the 4th capacitance C4 and the 4th resistance R4；
The other end of 6th resistance R6 is connected with one section of the 7th resistance R7 and the 8th resistance R8 respectively；7th resistance R7 leads to successively
Cross the input positive terminal that the 7th capacitance C7 and the 9th resistance R9 is connected to amplifier U；8th resistance R8 passes sequentially through the 8th capacitance C8
The input negative terminal of amplifier U is connected to the tenth resistance R10, the output end of the amplifier U is connected to main control chip.
2. FM broadcast singals adapter according to claim 1, it is characterised in that：Further include Active RC low-pass filter,
Including the 14th resistance R14 and the 9th capacitance C9 in parallel, one end is connected to the input negative terminal of amplifier U, and the other end is connected to
The output end of amplifier U.
3. FM broadcast singals adapter according to claim 1 or 2, it is characterised in that：Further include relay circuit, including
First triode Q1, the second triode Q2 and relay JDQ；The normally opened contact of the relay JDQ passes through the 19th capacitance C19
It is connected to radio-frequency modulations module；The normally-closed contact and central contact short circuit of the relay JDQ are connected to the output of amplifier U
End；The coil connecting terminal anode of the relay JDQ is connected with the collector of the first triode Q1, the first triode Q1's
Base stage is connected to the collector of the second triode, and is connected to VCC by the 21st resistance R21, and emitter is connected to GND；
The emitter of the second triode Q2 is connected to GND, and base stage is connected to an IO of main control chip by the 20th resistance R20
Mouthful；Further include the 20th capacitance C20 and the 22nd resistance R22 of parallel connection, one end is connected to radio-frequency modulations module, and the other end connects
It is connected to GND.
4. FM broadcast singals adapter according to claim 3, it is characterised in that：Further include third transistor Q3,
Base stage is connected to an I/O port of main control chip by the 17th resistance R17, this I/O port is connect with the 20th resistance R20
I/O port is different I/O port；
Emitter is connected to GND；
On the one hand base stage passes sequentially through the output end that the 15th resistance R15 and the 21st capacitance C21 is connected to amplifier U, separately
On the one hand passing sequentially through the 15th capacitance C15, the 19th resistance R19 and the 17th capacitance C17 is connected to the normally closed of relay JDQ
Contact；Further include the 16th resistance R16 and the 14th capacitance C14 of parallel connection, one end is connected to the collector of third transistor Q3,
The other end is connected to GND.
5. FM broadcast singals adapter according to claim 1, it is characterised in that：Phone module power supply and phone module connect
Ground is with audio and radio circuit part using independently-powered and ground connection.
6. FM broadcast singals adapter according to claim 3, it is characterised in that：The relay uses tq2-5V relays
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721483326.XU CN207691821U (en) | 2017-11-09 | 2017-11-09 | A kind of FM broadcast singals adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721483326.XU CN207691821U (en) | 2017-11-09 | 2017-11-09 | A kind of FM broadcast singals adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207691821U true CN207691821U (en) | 2018-08-03 |
Family
ID=62988253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721483326.XU Expired - Fee Related CN207691821U (en) | 2017-11-09 | 2017-11-09 | A kind of FM broadcast singals adapter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207691821U (en) |
-
2017
- 2017-11-09 CN CN201721483326.XU patent/CN207691821U/en not_active Expired - Fee Related
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180803 Termination date: 20211109 |