CN101843013A - At the control method and the circuit of the infrared receiver received signal that is used for remote control and infrared receiver with this control circuit - Google Patents
At the control method and the circuit of the infrared receiver received signal that is used for remote control and infrared receiver with this control circuit Download PDFInfo
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- CN101843013A CN101843013A CN200880114554A CN200880114554A CN101843013A CN 101843013 A CN101843013 A CN 101843013A CN 200880114554 A CN200880114554 A CN 200880114554A CN 200880114554 A CN200880114554 A CN 200880114554A CN 101843013 A CN101843013 A CN 101843013A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000003990 capacitor Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
- G08C23/04—Non-electrical signal transmission systems, e.g. optical systems using light waves, e.g. infrared
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/1141—One-way transmission
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Selective Calling Equipment (AREA)
- Optical Communication System (AREA)
Abstract
The present invention discloses a kind of control method that is used in the infrared receiver received signal that is used for remote control, and described control method comprises: judge whether the signal that inputs to described infrared receiver has N or more a plurality of discontinuous sections of being longer than for second time interval respectively in very first time interval; And according to the result of described judgement, distinguish data-signal and noise signal, and disclose a kind of control circuit that is used to carry out described control method, wherein use the discontinuous feature of described data-signal and described noise signal to come from input signal, clearly to distinguish and eliminate noise signal.
Description
Technical field
The present invention relates to a kind of control method and the control circuit that can from the signal that receives at the infrared receiver that is used for remote control, eliminate noise signal.
Background technology
Now, many electronic apparatuss all adopt infrared remote controller, so as can be in closely its function of remote control.Infrared remote controller comprises infrared transmitter and infrared receiver.
The user can send various operational orders to the main body of electronic apparatus by infrared transmitter.In other words, in response to user's control command input, infrared transmitter is used infrared ray, and also will carry out information encoded by a certain method is sent to the infrared remote control receiver that is arranged in the main body as carrier.According to the control command that infrared transmitter is launched, the function of infrared remote control receiver control electronic apparatus.
In infrared remote controller, misoperation that is caused by external noise etc. can throw into question.For example, if receive the noise that the band class that is had is similar to used infrared band the infrared remote controller from the outside, then infrared remote control receiver can be identified as the reception noise signal data-signal corresponding to user's instruction, thereby causes the electrical equipment misoperation.
Produce the source as representational noise, for example have luminaires such as indoor fluorescent lamp.Recently, various luminaires etc. can produce the noise signal that the band class that is had is similar to the data-signal frequency band of infrared remote controller, if therefore infrared remote controller is thought this noise signal by mistake to be the data-signal that infrared transmitter is launched, then electrical equipment may misoperation.
Traditionally, use the mode of a kind of gain amplifier control method as this problem of solution always.This gain amplifier control method is as described below.
Fig. 1 is used to explain that the gain amplifier control method by traditional eliminates the graphic of noise.As shown in Figure 1, the received signal 11 that is sent to infrared remote control receiver by the outside comprises data segments 12 and the discontinuous sections 13 along time shaft.No matter it is the data-signal launched by infrared transmitter or the noise signal that is produced by luminaire etc., and this received signal all has the feature that data segments and discontinuous sections alternately occur.
In infrared remote control receiver, survey the envelope of the input signal received, and with the amplitude and the reference voltage V of institute's detectable signal
RefCompare, thereby control output gain in the following manner.
Carry out output gain control 15, make the amplitude of working as institute's detectable signal be higher than reference voltage V
RefThe time, output gain reduces, and is lower than reference voltage V when the amplitude of institute's detectable signal
RefThe time, output gain increases.
Do not consider the white noise that in whole frequency band, in infrared receiver, produced, most of noise in the noise that generally provides the noise that causes by electric power or cause by extraneous light with the form of signal, decide on power cycle, this signal has the cycle of 4ms～10ms, and similarly, the signal launched of infrared transmitter has the form of certain one-period.
In addition, for one-period, compare with the infrared data signal, the noise that is caused by luminaire etc. has the short discontinuous sections corresponding to no infrared signal, thereby a big chunk of the envelope of received signal is higher than reference voltage V
RefTherefore, wherein the section that reduces of output gain becomes longer, makes that the amplitude of output signal continues to reduce when only continuing the reception noise.Finally, the amplitude of output signal is equal to or less than with reference to output valve, therefore surveys less than output signal.
On the other hand, for one-period, compare with noise signal, the data-signal that infrared transmitter is launched has the long discontinuous sections corresponding to no infrared signal.Therefore, opposite with the interference signal that is caused by luminaire etc., data-signal has long section that output gain wherein increases and the short section that reduces of output gain wherein, makes it can be detected as output signal.
Specifically, this method is charged (or discharge) reducing the gain that (or rising) control voltage increases or reduce internal amplifier by the electric current to capacitor, thus the overall gain of controlling receiver.At this moment, according to the quantity ratio between electric current that fills capacitor into and the electric current that from capacitor, discharges, distinguish infrared data signal and noise signal.
Yet the aforementioned gain amplifier control method that is used to eliminate noise has following problem.
Infrared remote controller uses various data formats in sending instruction, make data segments in one-period and the ratio between the discontinuous sections change.Therefore, if amplitude-this yield value of controlling output signal according to yield value be according to and reference voltage V
RefThe result who obtains that compares is determined, then not only is difficult to obtain the stable output signal that noise has been eliminated afterwards at the fixed time, and may influences output pulse width.
In other words, in one-period corresponding to the section of infrared signal and corresponding to aspect the ratio between the section of no infrared signal, various used infrared data forms are all inequality.Therefore, if use the electric current fill capacitor into from the constant ratio between the electric current of capacitor release, even then the infrared data that is received has identical amplitude, after sometime, obtain stable amplifier gain and also can change, thereby influence output pulse width according to the infrared data form.In addition, although remote controller is launched some coding, yet owing to gain controlling is reduced to these codings with reference to output valve or lower, thereby also may be not these coding detections can be data-signal.
Simultaneously, recently, it is varied that the kind of luminaire and function have become, and the noise source that therefore has various characteristics also increases.In addition, infrared remote controller provides various data formats, and its kind also becomes diversified.Therefore, if use gain amplifier control method based on ratio between data segments in the one-period and the discontinuous sections, then infrared receiver is thought control signal noise by mistake or is thought noise by mistake the possibility of control signal can increase, thereby causes the reliability problems that can not guarantee infrared remote control receiver.
Summary of the invention
Technical problem
For addressing the above problem, one aspect of the present invention provides a kind of control method and control circuit of infrared remote controller, and described infrared remote controller can have can clearly distinguish the data-signal of received signal in the infrared receiver and the reliability of noise signal.
Technical solution
A kind of being used for can comprise in the control method of the infrared receiver received signal that is used for remote control: judge whether the signal that inputs to infrared receiver has N or more a plurality of discontinuous sections of being longer than for second time interval respectively in very first time interval; And, distinguish data-signal and noise signal according to the result who judges.
A kind of being used for can comprise in the control method of the infrared receiver received signal that is used for remote control: produce first signal, this first signal has the information that whether surpasses reference level about the contour signal of input signal; Produce secondary signal according to first signal, this secondary signal has the information that whether surpassed for second time interval about discontinuous sections; Produce the 3rd signal according to secondary signal, whether the 3rd signal indication discontinuous sections occurs N time or more times in very first time interval; And,, determine that then input signal is a data-signal in very first time interval if discontinuous sections occurs N time or more times according to the 3rd signal.
A kind of being used for can comprise at the control circuit of the infrared receiver received signal that is used for remote control: the signal determining device is used to judge whether the signal that inputs to infrared receiver has N or more a plurality of discontinuous sections of being longer than for second time interval respectively in very first time interval; And squelch circuit, be used for result according to the judgement of signal determining device, occur N time or more times in very first time interval if be longer than the discontinuous sections in second time interval, then export input signal, otherwise then interrupt input signal.
A kind of infrared receiver can comprise the control circuit that is used for received signal.
Advantageous effects
The present invention adopts the discontinuous feature of data-signal and noise signal, thereby has the effect that can clearly distinguish and eliminate noise signal from received signal.In addition, according to the feature of data-signal, judgement time section value and discontinuous sections reference value are correctly controlled, thereby can improve the reliability of eliminating noise signal.
Description of drawings
Fig. 1 is used to explain by traditional gain amplifier control method eliminate the graphic of noise;
Fig. 2 is form graphic that is used to explain the noise that is produced by luminaire etc.;
Fig. 3 is form graphic that is used to explain the data-signal of being launched by infrared transmitter;
Fig. 4 is used to explain graphic according to the strength level of the signal of exemplary embodiment;
Fig. 5 is a flow chart of distinguishing data-signal and noise signal according to exemplary embodiment; And
Fig. 6 is the calcspar according to the signal judge module of the infrared remote control receiver of exemplary embodiment.
The main element description of symbols
11: received signal 12: data segments
13: discontinuous sections 15: output gain control
60: judge module 61: the signal determining device
62: squelch circuit
Embodiment
By the following detailed description relevant with accompanying drawing, the invention described above will be more clear.Hereinafter, will be elaborated to exemplary embodiment of the present invention in conjunction with the accompanying drawings.
Fig. 2 is form graphic that is used to explain the noise that is produced by luminaire etc.As shown in Figure 2, be characterised in that by generations such as luminaire and most of noise signals of receiving in infrared remote control receiver: it has cycle of 4ms～10ms according to power cycle, and wherein the receiving intensity of the noise signal discontinuous sections that is equal to or less than reference voltage is no more than the maximum of 10ms in one-period.
Fig. 3 is form graphic that is used to explain the data-signal of being launched by infrared transmitter.As shown in Figure 3, the infrared data signal that is emitted to infrared remote control receiver by infrared transmitter generally has the cycle of 40ms～200ms, and corresponding to the discontinuous sections of no infrared signal in one-period in 20ms to 100ms scope.
With reference to noise that is received and the signal shown in figure 2 and 3, have different cycles and discontinuous sections with signal by the infrared transmitter emission by the noise of generations such as luminaire.Therefore, the invention provides a kind of cycle of the noise or signal that is received and discontinuous feature is distinguished signal and noise in infrared remote control receiver method of adopting.
Fig. 4 is used to explain graphic according to the strength level of the signal of exemplary embodiment.As shown in Figure 4, the reference level that is used for the intensity of the signal that the district office receives comprises signal level, output level and noise level.
Below, the strength level according to the form of noise signal that is received shown in Fig. 2 and 3 and data-signal and signal shown in Figure 4 will describe a kind of method of distinguishing noise signal and data-signal.
If the voltage by infrared remote control receiver reception and amplifying signal is higher than output level, then at first received signal is considered as data-signal, therefore close squelch circuit, thereby export the present signal that receives.Therefore, no matter it is noise signal or data-signal, and the initial signal that receives that intensity is higher than output level all is output as data-signal.
From closing the moment of squelch circuit, the infrared signal that exports infrared remote controller to is observed the scheduled time, thereby judge that infrared signal is noise signal or data-signal.To at first be judged as data-signal at the signal that viewing duration received, and the infrared signal that output continue to receive in the gain of control amplifier, and make the crest voltage of this signal corresponding to the signal level that is higher than output level.
If the present signal that receives is actual infrared data signal, then regardless of the amplitude of the infrared data signal that is received, infrared signal after the amplification is kept had described signal level, thereby can reduce the variation of the pulsewidth of output signal to a great extent.At the fixed time, if judging the present signal that receives is noise signal, then connect squelch circuit to interrupt from infrared remote control receiver output noise signal, and as shown in Figure 2, the gain of step-down amplifier gradually makes the crest voltage of noise signal corresponding to the noise level that is lower than described output level.
For distinguishing, use the discontinuous feature of noise signal and data-signal by noise signal that produces and the data-signals that receives from infrared transmitter such as luminaires.
In other words, because according to cycle of electric power signal, noise signal has the cycle of 4ms～10ms usually, thereby wherein the signal strength signal intensity discontinuous sections of being less than or equal to reference value is no more than the maximum of 10ms in one-period.On the other hand, the infrared data signal has many kinds of forms, but most of infrared data signals have 40ms～200ms cycle and corresponding to its discontinuous sections of no infrared data signal in one-period in 20ms～100ms scope.
Therefore, for the signal that is received, in one-period, the time corresponding to the discontinuous sections of no infrared signal is carried out timing.Continue to reach 200ms or longer if timing time is no more than the signal of 10ms, can judge that then this signal is a noise signal.Why adopting 200ms or longer time to judge, is because the one-period of the longest infrared data signal is approximately 200ms.
Generally have different discontinuous features according to noise signal and data-signal, can distinguish the two in the following manner.
In other words, can whether in very first time interval, occur N time or more times, distinguish data-signal and noise signal according to the discontinuous sections of being longer than for second time interval respectively.Preferably, the very first time is spaced apart 200ms, and second time interval was 20ms, and N is 1.
Fig. 5 is a flow chart of distinguishing data-signal and noise signal according to exemplary embodiment.With reference to figure 5, with timer initialization (S51), and with the present time of timer compare at interval with the very first time (S52).If the time of timer is shorter than the very first time at interval, judge then whether input signal has N or more a plurality of discontinuous sections (S53) of being longer than for second time interval respectively.When input signal had N or more a plurality of discontinuous sections of being longer than for second time interval respectively, the judgement input signal was data-signal (S54).On the other hand, be less than N discontinuous sections of being longer than for second time interval respectively, then once more the present time of timer compared with second time interval (S52) if input signal has.Be longer than the very first time at interval the time when the time of timer, the judgement input signal is noise (S55).
Can be by the whole bag of tricks execution circuit that is used to distinguish data-signal and noise signal as shown in Figure 5.For example, can implement this circuit in the following manner.
Produce first signal, be used to indicate the contour signal of input signal whether to surpass reference level.Herein, reference level can be noise level, and will be wherein the input signal section that is no more than reference level be considered as discontinuous sections.Produce secondary signal, be used to indicate this discontinuous sections whether to surpass for second time interval.In addition, produce the 3rd signal, be used to indicate secondary signal in very first time interval, whether to have N or more a plurality of discontinuous sections.Therefore, when judging that according to the 3rd signal input signal is noise signal, squelch circuit is connected, but when judging that input signal is data-signal, squelch circuit, thus only outputting data signals connected.
Fig. 6 is the calcspar according to the signal judge module of the infrared remote control receiver of exemplary embodiment.With reference to figure 6, when the signal that will receive in infrared receiver by amplifier inputed to signal determining device 61, signal determining device 61 judged that input signal is data-signal or noise signal.
In other words, signal determining device 61 judges whether the signal that inputs to signal judge module 60 has N or more a plurality of discontinuous sections of being longer than for second time interval respectively in very first time interval.According to judged result, as long as have N or more a plurality of discontinuous sections of being longer than for second time interval respectively in very first time interval, squelch circuit 62 is just exported input signal, otherwise then interrupts input signal.
Preferably, the very first time is spaced apart 200ms, and second time interval was 20ms, and N is 1.
As mentioned above, by graphic and specification, various exemplary embodiment are illustrated.As a reference, the term that this paper adopted not is in order to dwindle implication and to limit the scope of the invention.Therefore, one skilled in the art will appreciate that under the condition that does not deviate from principle of the present invention and spirit can make change to these exemplary embodiment, scope of the present invention is limited by enclose claims and equivalent thereof under.
Industrial usability
The present invention can be applicable to be widely used as the infrared ray receiver of the remote controller of electronic apparatus, and also can be applicable to the control method that other is used for eliminating noise in addition.
Claims (13)
1. control method that is used in the infrared receiver received signal that is used for remote control, described control method comprises:
Judge whether the signal that inputs to described infrared receiver has N or more a plurality of discontinuous sections of being longer than for second time interval respectively in very first time interval; And
According to the result of described judgement, distinguish data-signal and noise signal.
2. control method as claimed in claim 1 is characterized in that the described very first time comprises 200ms at interval.
3. control method as claimed in claim 1 is characterized in that, described second time interval comprises 20ms.
4. control method as claimed in claim 1 is characterized in that described N comprises 1.
5. control method that is used in the infrared receiver received signal that is used for remote control, described control method comprises:
Produce first signal, described first signal has the information that whether surpasses reference levels about the contour signal of input signal;
Produce secondary signal according to described first signal, described secondary signal has the information that whether surpassed for second time interval about discontinuous sections;
Produce the 3rd signal according to described secondary signal, whether described the 3rd signal indicates described discontinuous sections to occur N time or more times in very first time interval; And
According to described the 3rd signal,, determine that then described input signal is a data-signal in described very first time interval if described discontinuous sections occurs N time or more times.
6. control method as claimed in claim 5 is characterized in that the described very first time comprises 200ms at interval.
7. control method as claimed in claim 5 is characterized in that, described second time interval comprises 20ms.
8. control method as claimed in claim 5 is characterized in that described N comprises 1.
9. control circuit that is used in the infrared receiver received signal that is used for remote control, described control circuit comprises:
The signal determining device is used to judge whether the signal that inputs to described infrared receiver has N or more a plurality of discontinuous sections of being longer than for second time interval respectively in very first time interval; And
Squelch circuit, be used for result according to the described judgement of described signal determining device, occur N time or more times in described very first time interval if be longer than the described discontinuous sections in described second time interval, then export described input signal, otherwise then interrupt described input signal.
10. control method as claimed in claim 5 is characterized in that the described very first time comprises 200ms at interval.
11. control method as claimed in claim 5 is characterized in that, described second time interval comprises 20ms.
12. control method as claimed in claim 5 is characterized in that, described N comprises 1.
13. an infrared receiver, comprise as in the claim 1,5 and 9 each is described be used to receive as described in the control circuit of signal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070109444A KR100976404B1 (en) | 2007-10-30 | 2007-10-30 | Control method and circuit for receiving signals in infrared receiver for remote control and infrared receiver having the control circuit |
| KR10-2007-0109444 | 2007-10-30 | ||
| PCT/KR2008/006433 WO2009057971A1 (en) | 2007-10-30 | 2008-10-30 | Control method and circuit for receiving signals in infrared receivier for remote control and infrared receiver having the control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101843013A true CN101843013A (en) | 2010-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880114554A Pending CN101843013A (en) | 2007-10-30 | 2008-10-30 | At the control method and the circuit of the infrared receiver received signal that is used for remote control and infrared receiver with this control circuit |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100976404B1 (en) |
| CN (1) | CN101843013A (en) |
| WO (1) | WO2009057971A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101404569B1 (en) * | 2013-02-14 | 2014-06-11 | 주식회사 에이디텍 | The noise removing circuit of infrared rays receiver |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1230308A (en) * | 1996-10-12 | 1999-09-29 | Temic德律风根微电子有限公司 | Data transmission equipment |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4418416A (en) * | 1981-04-06 | 1983-11-29 | Bell Telephone Laboratories, Incorporated | Frequency modulation transmitter for voice or data |
| GB2215892B (en) * | 1988-03-25 | 1992-05-06 | Pico Electronics Ltd | Analogue counter |
| DE69425247T2 (en) * | 1993-10-28 | 2001-02-22 | Koninkl Philips Electronics Nv | REMOTE CONTROL SYSTEM, LIGHTING SYSTEM AND FILTER |
| JP3305534B2 (en) * | 1995-04-05 | 2002-07-22 | シャープ株式会社 | Infrared receiver |
| US7224908B2 (en) * | 2000-10-13 | 2007-05-29 | Kiribati Wireless Ventures, Llc | Attenuation and calibration systems and methods for use with a laser detector in an optical communication system |
| DE10117838A1 (en) * | 2001-04-02 | 2002-10-17 | Omron Electronics Mfg Of Germa | Interference light suppression method and measuring device |
| KR100575351B1 (en) * | 2003-01-08 | 2006-05-03 | 주식회사 에이디텍 | Infrared-ray recceiver capable of removing noise |
| KR100646396B1 (en) | 2005-08-12 | 2006-11-14 | 최영헌 | Security system using infrared rays |
| KR20080068339A (en) * | 2007-01-19 | 2008-07-23 | 주식회사 유시스 | Infrared receiving error detecting method of cell phone |
-
2007
- 2007-10-30 KR KR1020070109444A patent/KR100976404B1/en not_active IP Right Cessation
-
2008
- 2008-10-30 CN CN200880114554A patent/CN101843013A/en active Pending
- 2008-10-30 WO PCT/KR2008/006433 patent/WO2009057971A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1230308A (en) * | 1996-10-12 | 1999-09-29 | Temic德律风根微电子有限公司 | Data transmission equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009057971A1 (en) | 2009-05-07 |
| KR100976404B1 (en) | 2010-08-17 |
| KR20090043728A (en) | 2009-05-07 |
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