CN201491007U - Device for converting audio signals into FM signals - Google Patents
Device for converting audio signals into FM signals Download PDFInfo
- Publication number
- CN201491007U CN201491007U CN2009201485748U CN200920148574U CN201491007U CN 201491007 U CN201491007 U CN 201491007U CN 2009201485748 U CN2009201485748 U CN 2009201485748U CN 200920148574 U CN200920148574 U CN 200920148574U CN 201491007 U CN201491007 U CN 201491007U
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Abstract
The utility model relates to a device for converting audio signals into FM signals. The device comprises a control circuit, an FM emitting circuit, an audio signal input circuit, a key input device, a power circuit and an audio detection circuit, wherein the key input device is connected with the control circuit for inputting commands to the control circuit, the power circuit is connected and supplies electric energy for the control circuit, the audio detection circuit and the FM emitting circuit, the audio detection circuit is connected with the control circuit, the FM emitting circuit is connected with the control circuit, and the audio signal input circuit is connected with the FM emitting circuit, and can emit signals to an FM receiver through an antenna. The device solves the problems caused that audio devices such as cell phones, MP3 and the like require to use microphones, when the device is connected with microphone interfaces of the audio devices such as cell phones and MP3s and plays, the device can obtain excellent reception effect from the FM receiver. The device simultaneously realizes the hands free function of cell phones in the driving process, thereby increasing the driving safety.
Description
Technical field
The present invention relates to the mobile communication technology field, particularly relate to a kind of device that audio signal can be converted to the FM signal and play.
Background technology
Raising along with people's living standard, MP3, products such as mobile phone are more and more universal, yet the MP3 that carries of MP3 of Chu Shouing or mobile phone comes playing back music by earphone in the market, long-term use earphone is listened to the music and is not only made the people feel hearing fatigue easily, and inconvenient; Also have mobile phone to have loudspeaker, but mobile phone loudspeaker stock size is less, its tonequality is relatively poor, and music appreciating has too many deficiency.On the other hand, existing mobile phone also has hand-free function, but speaker and mobile phone miaow head (approximately surpass 10CM) a long way off the time, the other side just can't not hear or sound very little.
The most important thing is that the driver receives calls or uses earphone to listen to the music when driving, cause driver's energy not concentrated easily, slack-off to the respond of accident, even the accident that meets accident.Though some high-grade configuration of automobiles has bluetooth handsfree telephony feature or consumer to buy bluetooth earphone now, these product prices are all very expensive.
The utility model content
Problem in view of above-mentioned prior art existence, the purpose of this utility model provides a kind of audio signal that equipment such as mobile phone or MP3 are sent and is converted to the FM signal and with the device that the FM receiver plays back, realizes that easily MP3 plays and the hands-free function of mobile phone by the FM receiver in MP3 or the mobile phone.
The technical solution of the utility model is: a kind of device that audio signal is converted to the FM signal, comprise control circuit, FM radiating circuit, audio signal input circuit, by key inputting device, power circuit, audio detection circuit, press key inputting device and connect control circuit, will order input control circuit; Power circuit is connected with control circuit, audio detection circuit, FM radiating circuit, is described circuit supply; Audio detection circuit is connected with control circuit; The FM radiating circuit is connected with control circuit and the control of controlled circuit; The audio signal input circuit is connected with the FM radiating circuit and by antenna audio signal is transmitted into the reception of FM receiver.
Described FM radiating circuit is made up of FM transmitting chip U2, crystal oscillator Y1, amplifier tube Q3 and antenna ANT1, crystal oscillator Y1 connects 23,24 pin of U2, for U2 provides work clock, the base stage of amplifier tube Q3 is by 19 pin of capacitor C 7 connection U2, and the FM signal amplifies through Q3 to be launched from antenna ANT1.
The input of described audio signal input circuit is connected with the earphone interface of mobile phone or MP3, and is connected with input 4 pin of U2 with capacitor C 10 by resistance R 7, and resistance R 8 is connected with input 6 pin of U2 with capacitor C 11.
The input of described audio signal input circuit also can connect a microphone.
Described control circuit comprises control chip U1,3 pin of control chip U1 be connected by key inputting device.
Described audio detection circuit is connected with 4 pin of control chip U1 by capacitor C 12, amplifier tube Q1.
Device of the present utility model is converted to the FM signal with audio signal and is transmitted on the FM receiver, solved the problem that audio frequency apparatuses such as mobile phone, MP3 need use earphone to bring, when device of the present utility model is connected the earphone interface of going up audio frequency apparatus, can obtain good audibility from the FM receiver.
When especially on automobile, using mobile phone, FM broadcast receiver on the automobile is transferred to suitable channel, earphone interface of mobile phone connects device of the present utility model, can play the music in the mobile phone, when cell phone incoming call, then concert stops automatically on the car, the other side's conversation sound can be sent by car horn, and cellie's sound can pass to the other side's mobile phone by microphone, and during talk-through, music is recovered to play automatically.Realized the hand-free function of mobile phone.Increased the safety of driving.
Description of drawings
Fig. 1 is a functional-block diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
With reference to the accompanying drawings, specify embodiment of the present utility model.
Audio signal is converted to the device of FM signal, comprises control circuit, FM radiating circuit, audio signal input circuit,, press key inputting device and connect control circuit, will order input control circuit by key inputting device, power circuit, audio detection circuit; Power circuit is connected with control circuit, audio detection circuit, FM radiating circuit, is described circuit supply; Audio detection circuit is connected with control circuit; The FM radiating circuit is connected with control circuit and the control of controlled circuit; The audio signal input circuit is connected with the FM radiating circuit and by antenna audio signal is transmitted into the reception of FM receiver.
Wherein the power supply in the power circuit is powered to control circuit by 3 ends of U3, for making described device volume little, can directly use lithium battery.
Control circuit comprises control chip U1,3 pin of control chip U1 be connected by key inputting device, give an order by key inputting device.
Described audio detection circuit is connected with 4 pin of control chip U1 by capacitor C 12, amplifier tube Q1.When audio signal is imported, this circuit is opened the power supply of FM radiating circuit, promptly allow the power supply pipe Q2 conducting of FM, when not having the audio signal input, then close the power supply of FM radiating circuit, promptly allow the power supply pipe Q2 of FM end, so just can when absence of audio is imported, close the power supply of FM radiating circuit, save battery consumption.
The input of audio signal input circuit can be three-way or the four-wire system headset plug, audio signal is from the earphone output of mobile phone or MP3,1 pin and 2 pin of input JP1 by the audio signal input circuit, be connected with input 4 pin of U2 with capacitor C 10 through resistance R 7, resistance R 8 is connected with input 6 pin of U2 with capacitor C 11.Its input also can meet a microphone MIC.And U2 is the transmitting chip of FM radiating circuit, and its model can be KT0801A.
The FM radiating circuit is made up of FM transmitting chip U2, crystal oscillator Y1, amplifier tube Q3 and antenna ANT1, crystal oscillator Y1 connects 23,24 pin of U2, for U2 provides work clock, the base stage of amplifier tube Q3 connects 19 pin of U2 by capacitor C 7, after the FM signal is handled through oscillating circuit, frequency multiplier circuit and signal amplification circuit, be modulated on the selected frequency of FM frequency range, signal launched from antenna ANT1, receive and play by the FM receiver by the collector electrode of amplifier tube Q3.The FM receiver can be a vehicle-mounted radio, also can be to possess the main system of audio that FM receives.
Claims (6)
1. device that audio signal is converted to the FM signal, comprise control circuit, FM radiating circuit, audio signal input circuit, by key inputting device, power circuit, audio detection circuit, press key inputting device and connect control circuit, will order input control circuit; Power circuit is connected with control circuit, audio detection circuit, FM radiating circuit, is described circuit supply; Audio detection circuit is connected with control circuit; The FM radiating circuit is connected with control circuit and the control of controlled circuit; The audio signal input circuit is connected with the FM radiating circuit and by antenna signal is transmitted into the reception of FM receiver.
2. the device that audio signal is converted to the FM signal according to claim 1, it is characterized in that described FM radiating circuit is made up of FM transmitting chip U2, crystal oscillator Y1, amplifier tube Q3 and antenna ANT1, crystal oscillator Y1 connects 23,24 pin of U2, for U2 provides work clock, the base stage of amplifier tube Q3 is by 19 pin of capacitor C 7 connection U2, and the FM signal amplifies through Q3 to be launched from antenna ANT1.
3. the device that audio signal is converted to the FM signal according to claim 1, the input that it is characterized in that described audio signal input circuit is connected with the earphone interface of mobile phone or MP3, and be connected with input 4 pin of U2 with capacitor C 10 by resistance R 7, resistance R 8 is connected with input 6 pin of U2 with capacitor C 11.
4. according to claim 3 audio signal is converted to the device of FM signal, it is characterized in that the input of described audio signal input circuit also can connect a microphone.
5. according to claim 1 audio signal is converted to the device of FM signal, it is characterized in that described control circuit comprises control chip U1,3 pin of control chip U1 be connected by key inputting device.
6. according to claim 5 audio signal is converted to the device of FM signal, it is characterized in that described audio detection circuit is connected with 4 pin of control chip U1 by capacitor C 12, amplifier tube Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201485748U CN201491007U (en) | 2009-04-03 | 2009-04-03 | Device for converting audio signals into FM signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201485748U CN201491007U (en) | 2009-04-03 | 2009-04-03 | Device for converting audio signals into FM signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201491007U true CN201491007U (en) | 2010-05-26 |
Family
ID=42429872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201485748U Expired - Fee Related CN201491007U (en) | 2009-04-03 | 2009-04-03 | Device for converting audio signals into FM signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201491007U (en) |
-
2009
- 2009-04-03 CN CN2009201485748U patent/CN201491007U/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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20110403 |