CN103152104A - Infrared transmitting circuit, transmitting end of infrared remote control system and implementation method thereof - Google Patents
Infrared transmitting circuit, transmitting end of infrared remote control system and implementation method thereof Download PDFInfo
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Abstract
The invention discloses an infrared transmitting circuit, comprising two infrared light-emitting diodes and an audio-frequency connector, wherein each infrared light-emitting diode is provided with a positive pin and a negative pin; the audio-frequency connector comprises a left-channel pin and a right-channel pin; and the left-channel pin is connected with the positive electrode of one infrared light-emitting diode and the negative electrode of the other infrared light-emitting diode simultaneously, and the right-channel pin is connected with the two remaining pins of the two infrared light-emitting diodes simultaneously. The invention also discloses a transmitting end of a infrared remote control system consisting of the infrared transmitting circuit and intelligent electronic equipment, and an implementation method thereof. The circuit structure has the characteristics of small size and low power consumption, and has the advantages of simple modulation mode and fast modulation speed and the like when being used for transmitting infrared light signals.
Description
Technical field
The application relates to a kind of transmitting terminal of infrared remote control system, particularly relates to infrared transmitting circuit wherein.
Background technology
Infrared Ray Remote Control Technology is widely used Industry Control, field of household appliances, the remote controller of typical case's application such as television set, air conditioner etc.
General infrared remote control system comprises transmitting terminal and receiving terminal two parts at least.
See also Fig. 1, the transmitting terminal of infrared remote control system comprises:
---man-machine interface can be button or the joystick of example, in hardware, can be also software interface etc., is used for receiving the operational order that the user assigns.
---the instruction encoding circuit, the operational order that the man-machine interface transmission comes is encoded, form infrared ray remotes control code.
---modulation circuit, infrared ray remotes control code is modulated on carrier wave, form modulation signal.Described carrier signal or produced or generated by the software mode of Interruption by CPU by the pierce circuit of hardware is generally continuous square-wave signal.The frequency of general infrared ray remotes control code only has hundreds of Hz, and the frequency of carrier signal is tens KHz, and modulation system commonly used is pulse-width modulation (PWM) and pulse position modulation (PPM).
---radiating circuit becomes modulation signal into infrared signal by electrical signal form and launches.Common radiating circuit is infrarede emitting diode.After modulation signal first passes through power amplification usually, then enter radiating circuit.
See also Fig. 2, the receiving terminal of infrared remote control system comprises:
---receiving circuit receives infrared signal and changes the signal of telecommunication into.Common receiving circuit is infrared photodiode.The signal of telecommunication after transformation is exactly the modulation signal that transmitting terminal produces, and usually also need amplify, the step such as filtering, detection, shaping.
---demodulator circuit demodulates infrared ray remotes control code the signal of telecommunication after changing.
---instruction decoding circuit is decoded as operational order with infrared ray remotes control code.
---drive circuit, control each actuator and carry out corresponding operating according to operational order.
Now can realize the transmitting terminal function of infrared remote control system on the mobile terminals such as mobile phone.
Application publication number is CN102368350A, Shen Qing Publication day to be that the Chinese invention patent application (hereinafter to be referred as A application) on March 7th, 2012 discloses a kind of apparatus and method that realize the versatility Infrared remote controller based on mobile phone.Device in the A application mainly is comprised of microprocessor chip, peripheral components, power supply, headset plug, has simultaneously Infrared Remote-Control Sending and learning functionality.Be connected by headset plug between this device and mobile phone, and adopt serial interface communication mode.Communication data is between the two prerecorded into 256 kinds of audio files with the byte form, by the analyzing audio file learn representative byte data.Because the record of specification is not detailed, infer from the angle of one of ordinary skill in the art, what transmit between this device and mobile phone is infrared ray remotes control code.On the one hand, microprocessor chip carries out the signal modulation and is sent by peripheral components according to infrared ray remotes control code, i.e. " emission " function; On the other hand, peripheral components returns to mobile phone after receiving infrared signal and analyzing infrared ray remotes control code by microprocessor chip, i.e. " study " function.
Granted publication number is that the Chinese utility model patent (hereinafter to be referred as the B patent) on December 5th, 2012 discloses the device that another kind of audio signal converts infrared remote-controlled signal to for CN202587126U, Granted publication day.Device in the B patent mainly is comprised of audio jack, signal amplifier, infrared emittance and battery.Its specification record is comparatively simple, does not provide the method for transmitting signals between this device and mobile phone, does not also provide the method how this device launches infrared signal.
Summary of the invention
The application's technical problem to be solved is to provide a kind of pluggable infrared transmitting circuit, and it can be connected by the earphone interface of audio connector with intelligent electronic devices such as mobile phone, panel computers, thereby consists of the transmitting terminal of infrared remote control system.For this reason, the application also will provide the implementation method of the transmitting terminal of described infrared remote control system.
For solving the problems of the technologies described above, the application's infrared transmitting circuit comprises two infrarede emitting diodes and an audio connector; Each infrarede emitting diode all has anodal and two pins of negative pole; Described audio connector comprises L channel and two pins of R channel; Described L channel pin connects the positive pole of an infrarede emitting diode and the negative pole of another infrarede emitting diode simultaneously, and described R channel pin connects two remaining pins of two infrarede emitting diodes simultaneously.
The transmitting terminal of the application's infrared remote control system comprises intelligent electronic device and infrared transmitting circuit two parts;
Described intelligent electronic device further comprises:
---man-machine interface receives the operational order that the user inputs;
---master chip receives the operational order that the man-machine interface transmission comes, Query Database and obtain the corresponding infrared ray remotes control code of this operational order; Also resulting infrared ray remotes control code is modulated on carrier signal, generates modulation signal; Also modulation signal is sampled with anti-phase, obtain the dual track digital audio and video signals;
---audio processing chip receives the dual track digital audio and video signals and generates the dual track simulated audio signal;
---earphone interface, output dual track simulated audio signal;
Audio connector in described infrared transmitting circuit is inserted in the earphone interface of intelligent electronic device; Form forward current between the positive pole of any infrarede emitting diode and negative pole, this infrarede emitting diode namely sends infrared signal.
The implementation method of the transmitting terminal of the application's infrared remote control system is:
In the 1st step, master chip receives the operational order that the man-machine interface transmission comes, Query Database and obtain the corresponding infrared ray remotes control code of this operational order;
In the 2nd step, master chip is modulated at the mode of infrared ray remotes control code with amplitude modulation on the carrier wave of sinusoidal wave form, generates modulation signal; Described carrier frequency be taken as the infrared signal that the transmitting terminal of infrared remote control system sends frequency 1/2;
In the 3rd step, master chip is sampled to modulation signal, the generating digital audio signal; Described sample frequency is more than or equal to the carrier frequency of 2 times; Master chip also carries out digital audio and video signals anti-phase, and the two-way digital audio and video signals of anti-phase front and back has consisted of dual track;
In the 4th step, audio processing chip receives the dual track digital audio and video signals, and generates the dual track simulated audio signal, then passes to earphone interface; Described simulated audio signal is by sinusoidal wave and quiet the composition, and modulation has high level and the low level of infrared ray remotes control code respectively; The simulated audio signal of left and right sound channels is anti-phase;
In the 5th step, the simulated audio signal of dual track passes to audio connector by earphone interface, forms forward current between the positive pole of any infrarede emitting diode in infrared transmitting circuit and negative pole, and this infrarede emitting diode is namely externally launched infrared signal; The frequency of described infrared signal is the carrier frequency of 2 times.
The alternate emission of the application's infrared transmitting circuit by two infrarede emitting diodes can make the frequency of infrared signal double the frequency of carrier signal, and when this just makes the signal modulation, speed is faster, also more saves computational resource.
The transmitting terminal of the application's infrared remote control system is comprised of intelligent electronic device and infrared transmitting circuit, and is simple in structure, with low cost, but computing capability is powerful, processing speed is fast, and can adapt to the receiving terminal of any existing infrared remote control system.
The implementation method of the transmitting terminal of the application's infrared remote control system, carried out the work of signal modulation, digital sample, phase shift by the master chip of intelligent electronic device, carry out digital-to-analogue conversion by audio processing chip, transmitted again the modulation signal of dual track simulated audio signal form by earphone interface and audio jack, finally carry out the emission of infrared signal by radiating circuit.Whole flow processing speed is fast, consumes resources is few, and has the characteristics such as the signal modulation system is simple.
Description of drawings
Fig. 1 is the composition structural representation of the transmitting terminal of infrared remote control system;
Fig. 2 is the composition structural representation of the receiving terminal of infrared remote control system;
Fig. 3 is the electrical block diagram of the first embodiment of the application's infrared transmitting circuit;
Fig. 4 is the electrical block diagram of the second embodiment of the application's infrared transmitting circuit;
Fig. 5 a, Fig. 5 b are respectively the pin schematic diagrames of three cores, four-core audio connector;
Fig. 6 is the structural representation of the first embodiment of transmitting terminal of the application's infrared remote control system;
Fig. 7 is the structural representation of the second embodiment of transmitting terminal of the application's infrared remote control system;
Fig. 8 is the flow chart that the transmitting terminal of the application's infrared remote control system is realized the infrared signal emission;
Fig. 9 is the schematic diagram of the simulated audio signal of left and right sound channels.
In figure, Reference numeral is:
10 is the first infrarede emitting diode; 20 is the second infrarede emitting diode; 30 is audio connector; 40 is infrared light-emitting device; 50 is intelligent electronic device; 51 is man-machine interface; 52 is master chip; 53 is audio processing chip; 54 is earphone interface; 60 is infrared transmitting circuit.
Embodiment
See also Fig. 3, this is the first embodiment of the application's infrared transmitting circuit 60, and it comprises:
---the first infrarede emitting diode 10 has anodal and two pins of negative pole.
---the second infrarede emitting diode 20 also has anodal and two pins of negative pole.
Infrarede emitting diode works under direct current, only have between positive pole and negative pole forward current by the time just can send infrared light, all do not send infrared light in all the other situations.
---audio connector 30 comprises these two pins of L channel and R channel at least.Described L channel pin connects the positive pole of the first infrared LED device 10 and the negative pole of the second infrared LED device 20 simultaneously, and described R channel pin connects the negative pole of the first infrared LED device 10 and the positive pole of the second infrared LED device 20 simultaneously; Perhaps annexation is opposite.
Preferably, the distance of the first infrared LED device 10 and the second infrared LED device 20 is more near better.
See also Fig. 4, this is the second embodiment of the application's infrared transmitting circuit 60, and it comprises:
---infrared light-emitting device 40 has two pins.Infrared light-emitting device 40 is packaged together and is formed by the first infrarede emitting diode 10 and the second infrarede emitting diode 20.During encapsulation, the negative pole of the positive pole of the first infrarede emitting diode 10 and the second infrarede emitting diode 20 is connected and as the first pin of infrared light-emitting device 40, the positive pole of the negative pole of the first infrarede emitting diode 10 and the second infrarede emitting diode 20 is connected and as the second pin of infrared light-emitting device 40.
---audio connector 30, comprise at least these two pins of L channel and R channel, connect respectively two pins of infrared light-emitting device 40, corresponding relation is not limit.
Above-mentioned the second embodiment is a kind of distortion of the first embodiment, in the second embodiment, the first light-emitting diode 10 and the second light-emitting diode 20 is packaged together by the semiconductor manufacturing factory business, thereby nearest.
In the embodiment of above-mentioned two infrared transmitting circuits, audio connector 30 is the above structure of three cores normally, and common is the audio connector of three cores or four-core.
See also Fig. 5 a, this is three core audio connectors, and the pin that has three velamen black insulating material mutually to isolate from bottom to top is respectively L channel, R channel and ground wire (order might change).
See also Fig. 5 b, this is the four-core audio connector, and the pin that has four velamen black insulating material mutually to isolate from bottom to top is respectively L channel, R channel, ground wire and microphone (order might change).
The application's infrared transmitting circuit only uses L channel and two pins of R channel of audio connector 30, and unnecessary pin is just unsettled.
See also Fig. 6, this is the first embodiment of the transmitting terminal of the application's infrared remote control system.The transmitting terminal of described infrared remote control system comprises intelligent electronic device 50 and infrared transmitting circuit 60 two parts.
Described intelligent electronic device 50 further comprises:
---such as button, touch-screen etc. of man-machine interface 51(), receive the operational order that the user inputs.
---such as baseband chip, CPU etc. of master chip 52(), receive man-machine interface 51 and transmit the operational orders of coming, Query Database and obtain the corresponding infrared ray remotes control code of this operational order.Described database is pre-stored in the memory of intelligent electronic device, wherein records the corresponding infrared ray remotes control code of each operational order.Master chip 52 also is modulated to resulting infrared ray remotes control code on carrier signal, generates modulation signal.Master chip 52 is also sampled to modulation signal and is anti-phase, obtains the digital audio and video signals of dual track.
---audio processing chip 53 receives the digital audio and video signals of dual track and generates the simulated audio signal of dual track, then passes to earphone interface 54.
---earphone interface 54, the simulated audio signal of output dual track.
Described infrared transmitting circuit 60 as shown in Figure 3, audio connector 30 wherein is inserted in the earphone interface 54 of intelligent electronic device 50.Described audio connector 30 receives the simulated audio signal of dual track, and the simulated audio signal of L channel is passed to the positive pole of the first infrarede emitting diode 10 and the negative pole of the second infrarede emitting diode 20, also the simulated audio signal with R channel passes to the negative pole of the first infrarede emitting diode 10 and the positive pole of the second infrarede emitting diode 20, also can be opposite signal transitive relation.Form forward current between any infrarede emitting diode 10,20 positive pole and negative pole, namely send infrared signal.
See also Fig. 7, this is the second embodiment of the transmitting terminal of the application's infrared remote control system.The difference of itself and the first embodiment only is: described infrared transmitting circuit 60 as shown in Figure 4, audio connector 30 wherein is inserted in the earphone interface 54 of intelligent electronic device 50.Described audio connector 30 receives the simulated audio signal of dual track, and the simulated audio signal of left and right sound channels is passed to respectively the second pin, first pin of infrared light-emitting device 40, also can be opposite signal transitive relation.Form forward current between any infrarede emitting diode 10 of infrared luminescent device 40 inner encapsulation, 20 positive pole and negative pole, namely send infrared signal.
In the equipment such as the portable intelligent electronic such as mobile phone, panel computer 50, the hardware componenies such as man-machine interface, master chip, audio processing chip, earphone interface are common standard configuration.The application makes intelligent electronic device 50 realize the transmitting terminal function of infrared remote controller by a pluggable infrared transmitting circuit 60 on this basis.
Alternatively, also can be on the L channel pin of audio connector 30 or R channel pin resistance of series connection, to realize current limliting, protection intelligent electronic device 50.
Alternatively, also can at inner amplifier circuit, the power supply etc. of increasing of infrared transmitting circuit 60, to amplify the simulated audio signal of dual track, obtain the transmission range of farther infrared signal.
See also Fig. 8, this is the flow chart that the transmitting terminal of the application's infrared remote control system carries out the implementation method of infrared signal emission, comprises the steps:
In the 1st step, master chip receives the operational order that the man-machine interface transmission comes, Query Database and obtain the corresponding infrared ray remotes control code of this operational order.Infrared ray remotes control code is comprised of high level and low level, the order of two kinds of level and duration difference just representing different implications.The frequency of infrared ray remotes control code only has tens to hundreds of Hz usually.
In the 2nd step, master chip is modulated at the mode of infrared ray remotes control code with amplitude modulation on the carrier wave of sinusoidal wave form, generates modulation signal.Described carrier wave is the sine wave signal of broad sense, does not limit initial phase, therefore also comprises the situations such as cosine wave.Carrier signal can represent with sin (2 π ft), and wherein f represents carrier frequency, and t represents the time.The application carrier frequency is taken as the infrared signal that the transmitting terminal of infrared remote control system sends frequency 1/2, be generally tens KHz.The modulator approach of described pulse amplitude modulation is: when infrared ray remotes control code was high level, modulation signal was carrier signal; When infrared ray remotes control code was low level, modulation signal was 0; Perhaps opposite.
In the 3rd step, master chip is sampled to modulation signal, the generating digital audio signal.Usually, sample frequency should be more than or equal to the carrier frequency of 2 times.Described digital audio and video signals can adopt any audio file formats, such as wav form, mp3 form etc. when sampling.When adopting the wav form, if the data precision of sampled point is 8 bits, adopt unsigned number; If the data precision of sampled point is 16 bits, adopt signed number.After obtaining digital audio and video signals, master chip also carries out anti-phase processing to it, digital audio and video signals originally and anti-phase after digital audio and video signals just consisted of dual track.
In the 4th step, audio processing chip receives the digital audio and video signals of dual track, and generates the simulated audio signal of dual track, then passes to earphone interface.Described simulated audio signal is by sinusoidal wave and quiet the composition, respectively correspondence high level and the low level of infrared ray remotes control code.The simulated audio signal of left and right sound channels is anti-phase.
In the 5th step, the simulated audio signal of dual track passes to audio connector by earphone interface, then passes to two infrarede emitting diodes.As long as form forward current between the positive pole of any infrarede emitting diode and negative pole, namely externally launch infrared signal.
See also Fig. 9, the simulated audio signal of left and right sound channels is anti-phase.No matter adopt Fig. 3 or infrared transmitting circuit shown in Figure 4, greater than 0 the time, right-channel signals voltage is less than 0 when left channel signals voltage, this moment first infrarede emitting diode 10 emission infrared signals, the second infrarede emitting diode 20 is not launched infrared signal; Or opposite.Less than 0 the time, right-channel signals voltage is greater than 0 when left channel signals voltage, this moment second infrarede emitting diode 20 emission infrared signals, the first infrarede emitting diode 10 is not launched infrared signal; Or opposite.To equal 0(quiet when left channel signals voltage) time, it is quiet that right-channel signals voltage also equals 0(), two infrarede emitting diodes 10,20 are not all launched infrared signal.
The designed infrared transmitting circuit of the application can alternately be launched infrared signal one time by two infrarede emitting diodes at most in the cycle separately at 2 π of simulated audio signal, and this frequency that just makes infrared signal is the carrier frequency of 2 times.And during the positive voltage of the just very maximum value of each infrarede emitting diode, negative pole is just the negative voltage of maximum value, thereby the infrared signal of emission is the strongest.
Take modal situation as example, when the frequency of having determined the infrared signal in the 5th step is 38KHz, the carrier frequency in the 2nd step is got 19KHz so, and the sample frequency in the 3rd step more than 38KHz, is for example 44KHz at least; Sample frequency is more high more accurate, but also higher to the requirement of real-time of computing capability.
When the application adopts intelligent electronic device to realize the transmitting terminal function of infrared remote control system, for the receiving terminal of infrared remote control system, the processes such as it receives, demodulation are completely without change, the transmitting terminal that is the application's infrared remote control system can compatible existing any receiving terminal, and need not receiving terminal is changed.
Compared with prior art, the transmitting terminal of the application's infrared transmitting circuit, infrared remote control system and its implementation have following advantage:
One, the application's infrared transmitting circuit simple in structure only interconnected by two infrarede emitting diodes and an audio connector and forms, and this has just reduced volume and the energy consumption of infraluminescence circuit, has saved manufacturing cost.
Its two, what the application was transmitted between intelligent electronic device and infrared transmitting circuit is the simulated audio signal of dual track, with the sine wave in simulated audio signal and quiet high level and the low level that represents respectively infrared ray remotes control code.Simulated audio signal is modulation signal process analog-to-digital conversion (i.e. sampling) and digital-to-analogue conversion (being the processing procedure of audio processing chip), still belongs in essence modulation signal.
A application is at mobile phone and what realize transmitting between the device of versatility Infrared remote controller is 256 kinds of audio files of prerecording, represents respectively 256 kinds of byte datas, and these byte datas represent is infrared ray remotes control code and unmodulated signal.This makes the signal modulated process in the A application be realized by microprocessor chip, has increased its described volume, energy consumption and manufacturing cost that realizes the device of versatility Infrared remote controller.
The B patent does not provide mobile phone and audio signal and converts method for transmitting signals between the infrared remote-controlled signal device to.
Its three, the application processes the master chip of the intelligent electronic device that the signal modulated process transfers to that computing capability is powerful, storage resources is abundant, this makes modulating speed very fast.And pass through circuit design cleverly, make the sine wave of the infrared signal frequency of carrier signal employing 1/2, by the half the time of sine wave signal in a complete cycle greater than 0, second half time is less than 0 rule, drive infrared transmitting circuit and launch 2 times to the infrared signal of carrier signal.Structure and the cost of infrared transmitting circuit can be farthest simplified in the sort circuit design, and modulation system is simple.
The A application is realized emission and the study of infrared ray remotes control code by microprocessor chip, its computing capability is difficult to compare favourably with the master chip of intelligent electronic device, thereby the signal modulating speed is limited.In addition, the content that is built infrared transmitting circuit by two infrarede emitting diodes is not put down in writing in the A application.
The B patent do not provide the audio signal representative implication, just do not know the process of signal modulation yet.And the B patent does not have record to be built the content of infrared transmitting circuit by two infrarede emitting diodes yet.
These are only the application's preferred embodiment, and be not used in restriction the application.For a person skilled in the art, the application can have various modifications and variations.All within the application's spirit and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in the application's protection range.
Claims (10)
1. an infrared transmitting circuit, is characterized in that, comprises two infrarede emitting diodes and an audio connector; Each infrarede emitting diode all has anodal and two pins of negative pole; Described audio connector comprises L channel and two pins of R channel; Described L channel pin connects the positive pole of an infrarede emitting diode and the negative pole of another infrarede emitting diode simultaneously, and described R channel pin connects two remaining pins of two infrarede emitting diodes simultaneously.
2. infrared transmitting circuit according to claim 1, it is characterized in that, described two infrarede emitting diodes are packaged together and form an infrared light-emitting device, the positive pole of an infrarede emitting diode is connected with the negative pole of another infrarede emitting diode and as the first pin of infrared light-emitting device, and two two remaining pins of infrarede emitting diode are connected and as the second pin of infrared light-emitting device; Two pins of audio connector are connected with two pins of infrared light-emitting device respectively.
3. infrared transmitting circuit according to claim 1 and 2, is characterized in that, described audio connector is the above structures of three cores, and the pin except L channel and R channel is unsettled.
4. the transmitting terminal of an infrared remote control system, is characterized in that, comprises intelligent electronic device and infrared transmitting circuit two parts as claimed in claim 1 or 2;
Described intelligent electronic device further comprises:
---man-machine interface receives the operational order that the user inputs;
---master chip receives the operational order that the man-machine interface transmission comes, Query Database and obtain the corresponding infrared ray remotes control code of this operational order; Also resulting infrared ray remotes control code is modulated on carrier signal, generates modulation signal; Also modulation signal is sampled with anti-phase, obtain the dual track digital audio and video signals;
---audio processing chip receives the dual track digital audio and video signals and generates the simulated audio signal of dual track;
---earphone interface, the simulated audio signal of output dual track;
Audio connector in described infrared transmitting circuit is inserted in the earphone interface of intelligent electronic device; Form forward current and namely send infrared signal between the positive pole of any infrarede emitting diode and negative pole.
5. the transmitting terminal of infrared remote control system according to claim 4, is characterized in that, resistance of series connection on the L channel pin of audio connector or R channel pin is to carry out current limliting.
6. the transmitting terminal of infrared remote control system according to claim 4, is characterized in that, at inner amplifier circuit, the power supply etc. of increasing of infrared transmitting circuit, to amplify the dual track simulated audio signal.
7. the implementation method of the transmitting terminal of an infrared remote control system, is characterized in that, comprises the steps:
In the 1st step, master chip receives the operational order that the man-machine interface transmission comes, Query Database and obtain the corresponding infrared ray remotes control code of this operational order;
In the 2nd step, master chip is modulated at the mode of infrared ray remotes control code with amplitude modulation on the carrier wave of sinusoidal wave form, generates modulation signal; Described carrier frequency be taken as the infrared signal that the transmitting terminal of infrared remote control system sends frequency 1/2;
In the 3rd step, master chip is sampled to modulation signal, the generating digital audio signal; Described sample frequency is more than or equal to the carrier frequency of 2 times; Master chip also carries out digital audio and video signals anti-phase, and the two-way digital audio and video signals of anti-phase front and back has consisted of dual track;
In the 4th step, audio processing chip receives the dual track digital audio and video signals, and generates the simulated audio signal of dual track, then passes to earphone interface; Described simulated audio signal is distinguished high level and the low level of corresponding infrared ray remotes control code by sinusoidal wave and quiet the composition; The simulated audio signal of left and right sound channels is anti-phase;
In the 5th step, the simulated audio signal of dual track passes to audio connector by earphone interface, forms forward current between the positive pole of any infrarede emitting diode in infrared transmitting circuit and negative pole, and this infrarede emitting diode is namely externally launched infrared signal; The frequency of described infrared signal is the carrier frequency of 2 times.
8. the implementation method of the transmitting terminal of infrared remote control system according to claim 7, is characterized in that, the modulator approach of described method in the 2nd step is: when infrared ray remotes control code was high level, modulation signal was carrier signal; When infrared ray remotes control code was low level, modulation signal was 0; Perhaps opposite.
9. the implementation method of the transmitting terminal of infrared remote control system according to claim 7, is characterized in that, described method is in the 3rd step, and described digital audio and video signals adopts audio file formats when sampling; When adopting the wav form, if the data precision of sampled point is 8 bits, adopt unsigned number; If the data precision of sampled point is 16 bits, adopt signed number.
10. the implementation method of the transmitting terminal of infrared remote control system according to claim 7, it is characterized in that, described method is in the 5th step, when left channel signals voltage greater than 0 the time, right-channel signals voltage only has an infrarede emitting diode emission infrared signal this moment less than 0; Less than 0 the time, right-channel signals voltage only has another infrarede emitting diode emission infrared signal this moment greater than 0 when left channel signals voltage; When left channel signals voltage equaled 0, right-channel signals voltage also equaled 0, and this moment, two infrarede emitting diodes were not all launched infrared signal.
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| CN103426291A (en) * | 2013-09-03 | 2013-12-04 | 陈光辉 | Universal remote control device based on 3.5mm audio jack of intelligent mobile terminal |
| CN104183113A (en) * | 2014-05-09 | 2014-12-03 | 录可系统公司 | Remote control circuit |
| CN105118282A (en) * | 2015-09-07 | 2015-12-02 | 无锡力芯微电子股份有限公司 | Infrared remote control equipment and system based on headphone interface |
| CN106600948A (en) * | 2016-12-30 | 2017-04-26 | 华为技术有限公司 | Infrared remote control device and terminal |
| EP3343530A1 (en) * | 2016-12-30 | 2018-07-04 | Huawei Technologies Co., Ltd. | Infrared remote control apparatus and terminal |
| US10339798B2 (en) | 2016-12-30 | 2019-07-02 | Huawei Technologies Co., Ltd. | Infrared remote control apparatus and terminal |
| CN106600948B (en) * | 2016-12-30 | 2019-09-03 | 华为技术有限公司 | A kind of infrared remote-control device and terminal |
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Application publication date: 20130612 |