CN106504508A - A kind of infrared communication interface circuit - Google Patents
A kind of infrared communication interface circuit Download PDFInfo
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- CN106504508A CN106504508A CN201510554896.2A CN201510554896A CN106504508A CN 106504508 A CN106504508 A CN 106504508A CN 201510554896 A CN201510554896 A CN 201510554896A CN 106504508 A CN106504508 A CN 106504508A
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Abstract
A kind of infrared communication interface circuit belongs to electricity field, relates particularly to a kind of improvement of infrared communication interface circuit.The present invention provides a kind of a kind of infrared communication interface circuit for disturbing little and good confidentiality.The present invention includes that infrared pulse module, photoelectric conversion module, frequency domain equalization module, valley extraction module, peak extraction module, threshold values generation module, bit decision module, differential signal form module, decoding circuit and differential signal output module；It is characterized in that：Infrared pulse module outfan connects photoelectric conversion module, photoelectric conversion module outfan connection frequency domain equalization module, frequency domain equalization module connect threshold values generation module by valley extraction module, peak extraction module, threshold values generation module connects bit decision module, and code element is illegally occupied module outfan connection differential signal and forms module, differential signal formation module connection decoding circuit and differential signal output module.
Description
Technical field
The invention belongs to electricity field, relates particularly to a kind of improvement of infrared communication interface circuit.
Background technology
In a communications system, control signal and data are often transmitted using non-electrical signal, to realize the function infrared communication of remote control or remote measurement, simple, easy to implement with controlling, the characteristics of transmission reliability is high, it is a kind of communication mode that more commonly uses.Infrared communication by the use of 950nm near infrared bands infrared ray as transmission information media, transmitting terminal adopts pulse time modulation mode, the pulse train that binary digital signal is modulated into a certain frequency, and drive infrared transmitting tube to send in the form of light pulse, the light pulse for receiving is converted into the signal of telecommunication by receiving terminal, demodulator circuit is given after amplification, Filtering Processing again, is exported after being reduced to binary digital signal.Easily occur disturbing the problem for causing communication failure and communication mistake during this, and confidentiality is poor.
Content of the invention
The present invention is aiming at the problems referred to above, there is provided a kind of interference is little and a kind of infrared communication interface circuit of good confidentiality.
For achieving the above object, the present invention adopts the following technical scheme that the present invention includes that infrared pulse module, photoelectric conversion module, frequency domain equalization module, valley extraction module, peak extraction module, threshold values generation module, bit decision module, differential signal form module, decoding circuit and differential signal output module；It is characterized in that：Infrared pulse module outfan connects photoelectric conversion module, photoelectric conversion module outfan connection frequency domain equalization module, frequency domain equalization module connect threshold values generation module by valley extraction module, peak extraction module, threshold values generation module connects bit decision module, and code element is illegally occupied module outfan connection differential signal and forms module, differential signal formation module connection decoding circuit and differential signal output module.
As a kind of preferred version, decoding circuit includes that PIN is input into, PIN input connection automatic gain control circuits, the control end of automatic gain control circuit connects the output port of control circuit, the outfan connection band filter of automatic gain control circuit, band filter connection control circuit and demodulator circuit.
Beneficial effects of the present invention.
The present invention has simple, with low cost hardware circuit, programming convenience, communication reliability high, it is achieved that the non-contacting data transfer of communicating pair, is used widely in application scenarios such as remote control, remote measurements.
Description of the drawings
Fig. 1 is principle of the invention block diagram.
Fig. 2 is decoding circuit figure of the present invention.
Specific embodiment
The present invention includes that infrared pulse module, photoelectric conversion module, frequency domain equalization module, valley extraction module, peak extraction module, threshold values generation module, bit decision module, differential signal form module, decoding circuit and differential signal output module；It is characterized in that：Infrared pulse module outfan connects photoelectric conversion module, photoelectric conversion module outfan connection frequency domain equalization module, frequency domain equalization module connect threshold values generation module by valley extraction module, peak extraction module, threshold values generation module connects bit decision module, and code element is illegally occupied module outfan connection differential signal and forms module, differential signal formation module connection decoding circuit and differential signal output module.
Decoding circuit includes that PIN is input into, PIN input connection automatic gain control circuits, the control end of automatic gain control circuit connects the output port of control circuit, the outfan connection band filter of automatic gain control circuit, band filter connection control circuit and demodulator circuit.
The key of infrared transmitter is the drive circuit of infrarede emitting diode and response.Infraluminescence earphone light first has to meet spectrum width of its modulation bandwidth more than signal, ensures that communication line is unimpeded.The launch wavelength of this UV light-emitting diode should be matched with the peak response of the photodetector (selecting silicon photo diode) of receiving terminal, farthest suppress background stray light interference, the infrared waves typically from 780nm～950nm carry out digital data transmission at this stage.As signal to noise ratio and the transmission power of infrared radio communication system square are directly proportional, so properly increasing the transmission power of infrared transmitter, and the measure that the luminous power of transmitting terminal is distributed in space uniform can be made using space diversity, holographic diffuser etc. to reduce the bit error rate, improve communication quality.The channel of Wireless Infrared Data Communication refers to the space between emitter and receptor.Due to the intervention of the background light signals such as natural light and artificial light source, electrically or optically effect of noise in signal source and transmitting, receiving device, Wireless Infrared Data Communication is poor in the communication quality of some occasions, needs to improve capacity of resisting disturbance using channel coding technology.In infrared communication system, as the transmission power of infrared transmitter is less, and signal is transmitted using infrared ray, is easily affected by external environment, and the signal that these factors result in infrared remote receiver is very weak, and level excursion is larger.Therefore, the Preamplifier of low noise and adaptive bit decision circuit are necessary.The preamplifier of low noise is typically from the higher field effect transistor amplifier of input impedance, and requires that with roomy, high gain, noise are low, disturbs little, and frequency response is mated with channel impulse response.Adaptive bit decision circuit can obtain optimal threshold level, and signal made decisions according to this threshold level, be decoded after transforming it into digital level from the change of motion tracking incoming signal level, recover primary signal.Meanwhile, band filter is adopted in order to filter off low-frequency noise and artificial disturbance, in order to mate with modulating characteristic and eliminate intersymbol interference frequently with balancing technique, adopt ball optic lens to obtain larger optical receiver working range and instantaneous field of view.These measures are all the raisings for being beneficial to Infrared Wireless Communication quality.Monolithic processor controlled infrared communication system mainly has infrared transmitter, infrared remote receiver, and three part of single chip computer89C51 composition, single-chip microcomputer does not have infrared communication interface in itself, serial line interface and piece infrared emission and the receiving circuit of single-chip microcomputer can be utilized, the Infrared Serial interface of a single-chip computer control system is constituted.
Claims (2)
1. a kind of infrared communication interface circuit, forms module, decoding circuit and differential signal output module including infrared pulse module, photoelectric conversion module, frequency domain equalization module, valley extraction module, peak extraction module, threshold values generation module, bit decision module, differential signal；It is characterized in that：Infrared pulse module outfan connects photoelectric conversion module, photoelectric conversion module outfan connection frequency domain equalization module, frequency domain equalization module connect threshold values generation module by valley extraction module, peak extraction module, threshold values generation module connects bit decision module, and code element is illegally occupied module outfan connection differential signal and forms module, differential signal formation module connection decoding circuit and differential signal output module.
2. a kind of infrared communication interface circuit according to claim 1, it is characterised in that：Decoding circuit includes that PIN is input into, PIN input connection automatic gain control circuits, the control end of automatic gain control circuit connects the output port of control circuit, the outfan connection band filter of automatic gain control circuit, band filter connection control circuit and demodulator circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510554896.2A CN106504508A (en) | 2015-09-05 | 2015-09-05 | A kind of infrared communication interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510554896.2A CN106504508A (en) | 2015-09-05 | 2015-09-05 | A kind of infrared communication interface circuit |
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| Publication Number | Publication Date |
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| CN106504508A true CN106504508A (en) | 2017-03-15 |
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| CN201510554896.2A Pending CN106504508A (en) | 2015-09-05 | 2015-09-05 | A kind of infrared communication interface circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108132673A (en) * | 2017-11-15 | 2018-06-08 | 安徽工程大学 | A kind of four-rotor aircraft control system based on STM32 |
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2015
- 2015-09-05 CN CN201510554896.2A patent/CN106504508A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108132673A (en) * | 2017-11-15 | 2018-06-08 | 安徽工程大学 | A kind of four-rotor aircraft control system based on STM32 |
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Application publication date: 20170315 |
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| WD01 | Invention patent application deemed withdrawn after publication |