CN1855773A - Infrared remote data communication device - Google Patents
Infrared remote data communication device Download PDFInfo
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- CN1855773A CN1855773A CNA2005100254615A CN200510025461A CN1855773A CN 1855773 A CN1855773 A CN 1855773A CN A2005100254615 A CNA2005100254615 A CN A2005100254615A CN 200510025461 A CN200510025461 A CN 200510025461A CN 1855773 A CN1855773 A CN 1855773A
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- data communication
- infrared remote
- communication device
- infrared
- carrier signal
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Abstract
The apparatus comprises an infrared emitting module, an infrared receiving module and a CPU; wherein, the emitting signal is emitted out through a modulation by a carrier signal; the generation and the duty ration of carrier signal is controlled by the CPU. The invention can solves the problem that is the carrier signal in existed infrared communication device has a large duty ratio so as to hardly make precise control.
Description
Technical field:
Data communication technology of the present invention field, particularly a kind of infrared remote data communication device.
Background technology:
At present, infrared remote control and this two aspect of data communication of being mainly used in, the remote control characteristics are that distance is far away, but required data quantity transmitted is less, general only is control codes several or tens bytes, and data communication infrared be a kind of newer technology of just having risen recent years, it is big that it has volume of transmitted data, characteristics such as transmission rate height.Existing popular IrDA is a standard of this type of technology.The general transmission rate of infrared communication mouth by the IrDA standard design is 2400bps-115.2kbps, some in addition can reach 4Mbps, but it has a weakness is that transmission range is closer, reach 1m at the most only, this is for utilizing infrared carrying out can't satisfy the demand for the remote transfer of data far away.
Infrared receiving/transmission device on the existing market is applied to the IrDA device and the remote control device of data communication nothing more than, and the characteristics near in view of the IrDA transmission range, that cost is high when being applied to remote infrared communication, generally adopt the infrared remote control device to realize infrared communication.But for improving transmission rate, make things convenient for the expense that connects and save encoding and decoding with asynchronous serial port, and satisfied " Electricity Department multifunctional electric energy meter communication protocol ", remote infrared communication does not adopt the remote control coding schemes such as PCM, PPM such as the household appliances remote control, but directly the TXD of asynchronous serial port is carried out the emission of 38KHz modulation rear drive infrared transmitting tube, receiving also is that output from infrared receiving module directly enters asynchronous serial port RXD.
See also Fig. 1, the data transfer mode of existing infrared data communication device is: realize by hardware circuit, it generally is common oscillating circuit, its shortcoming is that the duty ratio of carrier signal is generally bigger, is difficult to accomplish accurate control because circuit simple oscillation frequency is unstable easily, therefore, through after the modulate emission, average transmit power is bigger, and transmitting range is difficult to be improved.
In addition, the same restriction and the interference that can be subjected to environmental condition of infrared data communication with other communication mode.The interference source of infrared communication mainly comes from the interference of lighting sources such as indoor white light, incandescent lamp and outdoor sunlight.
Summary of the invention:
The purpose of this invention is to provide a kind of infrared remote data communication device, the duty ratio that mainly solves carrier signal in the transfer of data that has the infrared data communication device now is generally bigger, is difficult to accomplish the accurately technical problem of control.
For solving the problems of the technologies described above, the present invention is achieved in that
A kind of infrared remote data communication device, comprise infrared transmission module and receiver module, it transmits and launches by carrier signal by modulating the back, and it is characterized in that: have a CPU in this device, the generation of carrier signal and the duty ratio of carrier signal are directly controlled by CPU.
Above-mentioned infrared remote data communication device is characterized in that: transmitter module is that the TXD with asynchronous serial port carries out launching after the 38KHz modulation, and the output of receiver module directly enters asynchronous serial port RXD.
Above-mentioned infrared remote data communication device is characterized in that: this infrared remote receiver has filter.
Above-mentioned infrared remote data communication device is characterized in that: this infrared remote receiver is the receiver that has lens focus.
The present invention has following technique effect:
The radiation pattern of apparatus of the present invention, the generation of its carrier signal is directly controlled by CPU, and the stability of frequency of oscillation depends on the stability of system clock, and the General System clock is by crystal oscillator control, and therefore, its stability has improved several magnitude.The duty ratio of carrier signal also has the CPU programming Control, can accurately regulate, therefore, by its duty ratio of accurate control, can reduce its average power consumption greatly, simultaneously owing to adopted the burst pulse modulation technique, its instantaneous power (effective power) is improved, and its transmitting range also obtains increasing like this.
The present invention can be used on the digital communication equipments such as computer, mobile phone, PDA, uses very extensive.
Description of drawings:
Fig. 1 is existing infrared data communication modes schematic diagram.
Fig. 2 is an infrared remote data communication mode schematic diagram of the present invention.
Embodiment:
See also Fig. 2, a kind of infrared remote data communication device, it comprises infrared transmission module and receiver module, it transmits and launches by carrier signal by modulating the back, have a CPU in this device, the generation of carrier signal and the duty ratio of carrier signal are directly controlled by CPU.
This transmitter module is that the TXD with asynchronous serial port carries out launching after the 38KHz modulation, and the output of receiver module directly enters asynchronous serial port RXD.
This infrared remote receiver has filter.
This infrared remote receiver is the receiver that has lens focus.
Adopt radiating circuit of the present invention, average transmit power is descended, and transmitting range has promoted on the contrary, and anti-impulse disturbances ability obtains enhancing to a certain degree, achieves many things at one stroke.
Being preferred embodiment of the present invention only in sum, is not to be used for limiting practical range of the present invention.Be that all equivalences of doing according to the content of the present patent application claim change and modification, all should be technology category of the present invention.
Claims (4)
1, a kind of infrared remote data communication device, comprise infrared transmission module and receiver module, it transmits and launches by carrier signal by modulating the back, and it is characterized in that: have a CPU in this device, the generation of carrier signal and the duty ratio of carrier signal are directly controlled by CPU.
2, infrared remote data communication device according to claim 1 is characterized in that: transmitter module is that the TXD with asynchronous serial port carries out launching after the 38KHz modulation, and the output of receiver module directly enters asynchronous serial port RXD.
3, infrared remote data communication device according to claim 1 and 2 is characterized in that: this infrared remote receiver has filter.
4, infrared remote data communication device according to claim 3 is characterized in that: this infrared remote receiver is the receiver that has lens focus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100254615A CN1855773A (en) | 2005-04-27 | 2005-04-27 | Infrared remote data communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100254615A CN1855773A (en) | 2005-04-27 | 2005-04-27 | Infrared remote data communication device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1855773A true CN1855773A (en) | 2006-11-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100254615A Pending CN1855773A (en) | 2005-04-27 | 2005-04-27 | Infrared remote data communication device |
Country Status (1)
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| CN (1) | CN1855773A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188020A (en) * | 2011-12-30 | 2013-07-03 | 北京同步科技有限公司 | Concentrator, optical communication device and data communication method |
| CN110187172A (en) * | 2019-07-04 | 2019-08-30 | 中材晶通新能源科技(北京)有限公司 | A kind of ammeter monitoring system converted based on infrared modulated with wireless communication |
-
2005
- 2005-04-27 CN CNA2005100254615A patent/CN1855773A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103188020A (en) * | 2011-12-30 | 2013-07-03 | 北京同步科技有限公司 | Concentrator, optical communication device and data communication method |
| CN103188020B (en) * | 2011-12-30 | 2016-06-01 | 北京同步科技有限公司 | Hub, optical communication equipment and data communication method |
| CN110187172A (en) * | 2019-07-04 | 2019-08-30 | 中材晶通新能源科技(北京)有限公司 | A kind of ammeter monitoring system converted based on infrared modulated with wireless communication |
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| WD01 | Invention patent application deemed withdrawn after publication |