CN2671269Y - Mobile telephone with inner non-liftable circuit module - Google Patents
Mobile telephone with inner non-liftable circuit module Download PDFInfo
- Publication number
- CN2671269Y CN2671269Y CNU2003201180263U CN200320118026U CN2671269Y CN 2671269 Y CN2671269 Y CN 2671269Y CN U2003201180263 U CNU2003201180263 U CN U2003201180263U CN 200320118026 U CN200320118026 U CN 200320118026U CN 2671269 Y CN2671269 Y CN 2671269Y
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- mobile phone
- frequency
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Abstract
The utility model relates to a frequency modulation wireless technology applied to the mobile phone, in particular to a mobile telephone with an inner non-liftable circuit module. The utility model is composed of a mobile phone audio frequency output, an FM frequency modulation transmitter and a transmitting antenna. The audio signals of an incoming call received from the mobile phone are input the FM frequency modulation transmitter module circuit embedded in the mobile phone to carry out frequency modulation; the frequency modulation signals are transmitted by the antenna embedded in the mobile phone. Compared with prior art, the utility model skillfully applies the mature FM frequency modulation transmitting technology to the mobile phone, which makes the mobile phone increase the new non-liftable conversation function. The scheme integrates the frequency modulation transmitter into an IC module, which facilitates to integrate with the mobile phone circuit for using.
Description
Technical field
The utility model has related to the application of a kind of frequency modulation wireless technology at mobile phone, is specially adapted to the mobile phone of built-in hands-free module circuit.
Background technology
Up to the present the hands-free lift-off technology of the radio of mobile phone handsets, has only indivedual high-end mobile phones to use Bluetooth technology.As for Bluetooth technology, present stage, still in maturation progressively, its cost was higher, also must wear corresponding bluetooth earphone in addition, be unable to do without trouble and the discomfort of wearing earphone all the time.For this reason, this patent has proposed the hands-free lift-off technology scheme of new embedded in mobile phone.
The purpose of this utility model is to be the built-in hands-free radio transmission technical scheme of mobile phone handsets.Manufacture transmitter module according to this programme,, and combine, then realize the atypical embedded in mobile phone radio hand-free function except that Bluetooth technology with mobile phone circuit as long as transmitter module is built in the mobile phone.It is the FM FM broadcasting frequency range of 88～108MHZ that built-in transmitter module adopts frequency, therefore, its hands-free reception then is common FM FM receiver partly, then can utilize the FM FM receiver in the car to realize hand-free call in the car when using in automobile, and is simple and convenient, economical and practical.
Summary of the invention
The purpose of this utility model is achieved by the following technical solution: the utility model is made up of handset audio output, FM frequency-modulated transmitter and transmitting antenna, collect the audio signal of calling from mobile phone, the FM frequency-modulated transmitter modular circuit that input is built in the mobile phone is carried out frequency modulation, and FM signal is launched by the antenna that is built in the mobile phone.
FM frequency-modulated transmitter modular circuit described in the utility model is mainly produced and modulation circuit by reference frequency, frequency multiplier circuit, and the power amplification radiating circuit is formed.The triode N1 of described FM frequency-modulated transmitter modular circuit and crystal XT form reference frequency and produce and FM circuit, produce the reference frequency of 17.6～18MHZ.The triode N2 of FM frequency-modulated transmitter modular circuit after 5 frequencys multiplication and 6 frequencys multiplication, can produce two groups of high-frequency modulation signals to reference frequency in 88～108MHZ frequency range, launched by ring Shape antenna after triode N3 amplifies again.
FM frequency-modulated transmitter modular circuit pin 1 described in the utility model is an audio signal input end, and pin 2,3 is that external crystal produces reference frequency, and pin 4 is a common, and pin 5 is for connecing the high frequency output of antenna, and pin 6 is the Vcc feeder ear.FM frequency-modulated transmitter modular circuit operating voltage is 2.5～5V.
The utility model compared with prior art is applied in the FM frequency modulation lift-off technology of maturation in the mobile phone handsets dexterously, makes mobile phone handsets increase new hand-free call function.This programme is integrated into the IC module to frequency-modulated transmitter, is convenient to be used in combination with the circuit of mobile phone.
Description of drawings
Fig. 1 is the electrical schematic diagram of the utility model FM transmitter module.
Fig. 2 is the output pin numbering figure that the utility model FM transmitter module is connected with embedded in mobile phone.
Embodiment
Below in conjunction with description of drawings the utility model is described in further detail: the electric principle of this FM transmitter module as shown in Figure 1, it mainly produces circuit 11 by high frequency standard modulation, high frequency carrier frequency multiplier circuit 12, high frequency amplification output circuit 13 is formed.The course of work of this transmitter module is formed oscillatory modulation circuit for triode N1 and the crystal XT that the modulation of electrical schematic diagram high frequency standard produces in the circuit 11, produce the reference frequency of 17.6～18MHZ, triode N2 in the electrical schematic diagram high frequency carrier frequency multiplier circuit 12 reference frequency after 5 frequencys multiplication and 6 frequencys multiplication, can produce two groups of high-frequency modulation signals in the frequency range of 88～108MHZ, the triode N3 in electrical schematic diagram high frequency amplification output circuit 13 is launched by the ring Shape antenna that is arranged on the electroplax after amplifying again.
The external form function connecting pin of transmitter module as shown in Figure 2, wherein 1. pin is audio signal input end, 2., 3. pin is that external crystal produces reference frequency, 4. pin is common, 5. for connecing the high frequency output of antenna, 6. pin is the Vcc feeder ear to pin, and its operating voltage is 2.5～5V.Transmitter module combines simply with the circuit of mobile phone, in the function setting of mobile phone, increase a hand-free function item, or peripheral hardware independence hand-free function key, when needs use hand-free call, be set at hand-free function, the internal control circuit of mobile phone is a module for power supply during conversation, and module is started working, the audio frequency of calling is launched after modulation, utilized the FM FM receiver to receive calling.Transmitter module of the present utility model is a micropower milliwatt level, other circuit and equipment is not exerted an influence.
Claims (6)
1, a kind of mobile phone of built-in hands-free module circuit, formed by handset audio output, FM frequency-modulated transmitter and transmitting antenna, it is characterized in that collecting the audio signal of calling from mobile phone, the FM frequency-modulated transmitter modular circuit that input is built in the mobile phone is carried out frequency modulation, and FM signal is launched by the antenna that is built in the mobile phone.
2, the mobile phone of built-in hands-free module circuit according to claim 1 is characterized in that described FM frequency-modulated transmitter modular circuit is mainly produced and modulation circuit by reference frequency, frequency multiplier circuit, and the power amplification radiating circuit is formed.
3, the mobile phone of built-in hands-free module circuit according to claim 2 is characterized in that the triode N1 of described FM frequency-modulated transmitter modular circuit and crystal XT form reference frequency generation and FM circuit, produce the reference frequency of 17.6～18MHZ.
4, the mobile phone of built-in hands-free module circuit according to claim 3, the triode N2 that it is characterized in that described FM frequency-modulated transmitter modular circuit reference frequency after 5 frequencys multiplication and 6 frequencys multiplication, can in 88～108MHZ frequency range, produce two groups of high-frequency modulation signals, after triode N3 amplifies, launch again by ring Shape antenna.
5, the mobile phone of built-in hands-free module circuit according to claim 1, it is characterized in that described FM frequency-modulated transmitter modular circuit pin 1 is audio signal input end, pin 2,3 is that external crystal produces reference frequency, pin 4 is a common, pin 5 is for connecing the high frequency output of antenna, and pin 6 is the Vcc feeder ear.
6, the mobile phone of built-in hands-free module circuit according to claim 5 is characterized in that FM frequency-modulated transmitter modular circuit operating voltage is 2.5～5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201180263U CN2671269Y (en) | 2003-11-13 | 2003-11-13 | Mobile telephone with inner non-liftable circuit module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201180263U CN2671269Y (en) | 2003-11-13 | 2003-11-13 | Mobile telephone with inner non-liftable circuit module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2671269Y true CN2671269Y (en) | 2005-01-12 |
Family
ID=34475464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2003201180263U Expired - Fee Related CN2671269Y (en) | 2003-11-13 | 2003-11-13 | Mobile telephone with inner non-liftable circuit module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2671269Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008122156A1 (en) * | 2007-04-06 | 2008-10-16 | Dong Fang | Cell phone with music radio transmitting |
-
2003
- 2003-11-13 CN CNU2003201180263U patent/CN2671269Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008122156A1 (en) * | 2007-04-06 | 2008-10-16 | Dong Fang | Cell phone with music radio transmitting |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |