KR100976404B1 - Control method and circuit for receiving signals in infrared receiver for remote control and infrared receiver having the control circuit - Google Patents
Control method and circuit for receiving signals in infrared receiver for remote control and infrared receiver having the control circuit Download PDFInfo
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- KR100976404B1 KR100976404B1 KR1020070109444A KR20070109444A KR100976404B1 KR 100976404 B1 KR100976404 B1 KR 100976404B1 KR 1020070109444 A KR1020070109444 A KR 1020070109444A KR 20070109444 A KR20070109444 A KR 20070109444A KR 100976404 B1 KR100976404 B1 KR 100976404B1
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- signal
- time interval
- infrared
- reception control
- noise
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000000284 resting effect Effects 0.000 claims abstract description 11
- 238000007689 inspection Methods 0.000 claims abstract 2
- 238000010586 diagram Methods 0.000 description 10
- 230000003321 amplification Effects 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
Abstract
The present invention relates to a signal input to an infrared receiver for wireless control, and to a signal input to the infrared receiver, a second time that is a reference value of a resting period within a first time interval that is a set value of one period for an infrared data signal. Checking whether there is at least N resting periods exceeding the interval; And a signal reception control method applied to the infrared wireless receiver and a signal reception control circuit for performing the signal reception control method according to the inspection result. According to the present invention, the noise signal can be clearly distinguished and removed from the input signal by using the pause characteristics of the data signal and the noise signal, and stable gain values regardless of the shape of the various data signals by appropriately controlling the determination time interval value and the pause reference value Since it is possible to maintain the reliability of the reception performance is effective.
Infrared wireless receivers, pauses, data signals, noise signals
Description
The present invention relates to a control method and a control circuit for removing a noise signal from a signal received at an infrared receiver for radio control.
In many current electronic products, infrared wireless control devices are used to control the functions of electronic products in a short distance wirelessly. The infrared radio control device consists of an infrared transmitter and an infrared receiver.
The user can transmit various operation commands to the main body of the product by using an infrared transmitter. That is, the infrared transmitter transmits the coded information in a predetermined manner to the infrared wireless receiver provided in the main body by using an infrared (red) as a carrier (carrier) according to the user's control command input. The infrared wireless receiver controls the functions of the main body of the electronic product according to the control command transmitted from the infrared transmitter.
In the infrared radio control apparatus, malfunction due to external noise or the like becomes a problem. For example, when noise from a band similar to the infrared band used by the infrared wireless control device is received from the outside, the infrared wireless receiver recognizes the received noise signal as a data signal according to a user's command and may cause a malfunction in the device. have.
A typical source of noise generating noise is various lighting fixtures such as fluorescent lamps used indoors. Recently, various lighting fixtures and the like generate noise signals similar to data signals in a band similar to an infrared wireless control device, and thus, when an infrared wireless receiver mistaken such a noise signal as a data signal transmitted from an infrared transmitter, it may malfunction. .
According to the prior art, to solve this problem, an amplification gain control scheme has been used. The amplification gain control method will be described below.
1 is a diagram illustrating an example of a noise removing method using an amplification gain adjustment scheme according to the related art. As shown in FIG. 1, when the
In the infrared wireless receiver, an
The amplitude of the detected signal is equal to the reference voltage (
Except for the white noise of the entire band generated inside the infrared receiver, the noise caused by the power supply or the disturbance light generally has a signal form of the period of 4 ms to 10 ms, depending on the power cycle. The signal format transmitted from the infrared transmitter also has a certain period.
In addition, noises caused by lighting fixtures and the like have a short period of rest without an infrared signal when compared to an infrared data signal, so that the envelope of the received signal is a reference voltage. There is a lot bigger than). Therefore, since the interval for reducing the output gain becomes longer, when only noise is continuously received, the magnitude of the output signal is continuously reduced, and finally, it is lowered below the output reference value and is not detected as an output signal.
On the other hand, when the data signal transmitted from the infrared transmitter is based on one cycle, the rest period without the infrared signal is longer than that of the noise signal. Therefore, unlike the interference signals caused by the lighting fixtures, the interval for increasing the output gain is long, and the interval for decreasing the output gain is short, and thus is detected as an output signal.
This method specifically regulates the gain of the entire receiver by charging (or discharging) the current in the capacitor to reduce (or increase) the regulation voltage in the direction of increasing or decreasing the gain of the internal amplifier. In this case, the infrared data signal and the noise signal are distinguished by a ratio of the amount of current charged to the capacitor and the amount of current discharged.
However, the noise cancellation method according to the amplification gain adjustment method as described above has the following problems.
The infrared wireless control device transmits commands using various kinds of data formats. Therefore, the ratio of the lengths of the data portion and the idle portion becomes different within one period. Therefore, the reference voltage (
That is, in each of the various types of infrared data formats used, the ratio between the section with and without the infrared signal is different within one period, so that the ratio of the amount of current charged to the capacitor and the amount of current discharged is fixed. Even with the same size, the gain of a stabilized amplifier after a certain amount of time varies for each infrared data format, which in turn affects the pulse width of the output itself. In addition, although specific codes are signals transmitted from the radio control apparatus, the specific codes may be lowered below the output reference value according to gain control, and thus may not be detected as signals.
On the other hand, as the types and functions of lighting fixtures are recently diversified, noise sources having various characteristics are increasing. In addition, as the type of the infrared radio controller varies, various data formats are provided. As a result, when the amplification gain adjustment method using the ratio of the data portion and the idle portion is used within one period, the probability of the infrared receiver misrecognizing the control signal as noise or the noise as the control signal increases, which increases the reliability of the infrared wireless receiver. There is a problem that cannot be secured.
An object of the present invention is to provide a reliable reception signal control method and control circuit for clearly distinguishing a data signal and a noise signal among signals input to an infrared receiver in an infrared radio control apparatus.
A signal reception control method of the present invention for achieving the above object is a signal reception control method applied to an infrared receiver for wireless control, with respect to the signal input to the infrared receiver, one cycle of the infrared data signal Checking whether there is at least N rest periods exceeding a second time period that is a reference value of the rest period within a first time period that is a set value; And distinguishing the data signal from the noise signal according to the test result.
In addition, the signal reception control method of the present invention, in a signal reception control method applied to an infrared receiver for wireless control, generating a first signal having information on whether the outer signal of the input signal exceeds the reference level; ; Generating a second signal having information on whether the resting period exceeds a second time interval that is a reference value using the first signal; Generating a third signal using the second signal indicating whether there is at least N rest periods within a first time interval that is a set value of one period with respect to an infrared data signal; And determining the input signal as a data signal when there is at least N pauses in the first time interval by using the third signal.
In addition, the signal reception control circuit of the present invention is a signal reception control circuit applied to an infrared receiver for wireless control, wherein the input signal input to the infrared receiver is a set value of one period for an infrared data signal. A signal inspecting unit checking whether there is at least N times of rest periods exceeding a second time period that is a reference value of the rest periods within one time period; And outputting the input signal when the idle time exceeding the second time interval is present at least N times within the first time interval according to a test result of the signal inspecting unit, and otherwise blocking the input signal. A squelch circuit unit.
In addition, the infrared receiver of the present invention includes the above-described signal reception control circuit.
The present invention has an effect of clearly distinguishing and removing a noise signal from an input signal by using a pause characteristic of a data signal and a noise signal. In addition, by properly controlling the determination time interval value and the idle period reference value, it is possible to maintain a stable gain value regardless of the shape of the various data signals, thereby increasing the reliability of the reception performance.
The present invention described above will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
2 is an explanatory diagram showing a form of noise generated by a luminaire or the like. As shown in FIG. 2, a noise signal generated by a luminaire or the like and received by an infrared wireless receiver has a period of 4 ms to 10 ms according to a power cycle, and a reception intensity of the noise signal falls below a reference voltage within a period. It has a characteristic that the idle time does not exceed 10ms at the maximum.
3 is an explanatory diagram showing a form of a data signal transmitted from an infrared transmitter. As shown in FIG. 3, an infrared data signal transmitted from an infrared transmitter and received by an infrared wireless receiver mainly has a period of 40 ms to 200 ms, and a rest period without an infrared signal corresponds to 20 ms to 100 ms in one period.
Referring to the received noise signal and the signal shape of FIGS. 2 and 3, it can be seen that the noise generated by the luminaire and the signal transmitted from the infrared transmitter have completely different characteristics in terms of period and pause. Accordingly, the present invention provides a method for distinguishing a signal from a noise in an infrared wireless receiver by using reception noise or a period and pause characteristics of a signal.
4 is an exemplary explanatory diagram showing a level of signal strength. As shown in FIG. 4, a reference level for dividing the strength of a received signal includes a signal level, an output level, and a noise level.
A method of distinguishing a noise signal from a data signal using the received noise signal and data signal types of FIGS. 2 and 3 and the signal strength level of FIG. 4 will now be described.
When the signal received and amplified by the infrared wireless receiver has a voltage greater than the output level, the input signal is assumed to be a data signal, and the squelch circuit is turned off and the currently received signal is output. Therefore, the initially input signal having a higher intensity than the output level, whether the noise signal or the data signal, is output like the data signal.
From the moment the squelch circuit is turned off, the infrared signal input to the infrared wireless receiver is observed for a certain period of time to distinguish whether the signal is a noise signal or a data signal. The signal received during this time is once determined to be a data signal, and the infrared signal is continuously output while adjusting the gain of the amplifier so that the peak voltage of the signal is higher than the output level.
If the currently received signal is an actual infrared data signal, the intensity of the amplified infrared signal is maintained at the signal level regardless of the magnitude of the received infrared data signal, thereby changing the pulse width variation of the output signal according to the size of the input signal. Can be greatly reduced. After a certain time, if it is determined that the signal currently being received is a noise signal, the squelch circuit is turned on to block the output of the noise signal from the infrared wireless receiver, and as shown in FIG. Peak) Slowly decreases the gain of the amplifier to set the noise level below the output level.
In order to distinguish a noise signal generated from a luminaire and the like and a data signal transmitted from an infrared transmitter, a noise characteristic of a noise signal and a data signal is used.
That is, since most of the noise signal has a period of 4ms ~ 10ms according to the cycle of the power signal, in most cases, the idle period of the signal strength is less than the reference value within a period does not exceed a maximum of 10ms. There are many types of infrared data signals, but most of one cycle is 40ms ~ 200ms, and the rest period without infrared data signal within one cycle is 20ms ~ 100ms.
Therefore, the time interval of the idle period in which there is no infrared signal within the period of the received signal is measured, and if the signal that does not exceed 10 ms for more than 200 ms can be determined as a noise signal. The time required for this determination is 200 ms or more because one cycle of the longest infrared data signal is about 200 ms.
Therefore, in general, by using the noise signal and the data signal has a different pause characteristics, it can be distinguished in the following manner.
That is, the data signal and the noise signal may be distinguished based on whether or not the resting period having a magnitude greater than or equal to the second time interval, which is the reference value of the resting period, is present at least N times during the first time interval, which is a set value of one period for the infrared data signal. Can be. In this case, setting values of the first time interval and the second time interval may be set according to the format of the infrared data signal. Referring to the infrared transmission / reception system currently used, the first time interval is 200 ms, the second time interval is 20 ms, N preferably has a value of 1.
5 is a flowchart illustrating a method of distinguishing a data signal from a noise signal. Referring to FIG. 5, first, a timer is initialized (S51), and a current timer time is compared with a first time interval value (S52). If the timer time is smaller than the first time interval value, it is checked whether the input signal has at least N times of rest periods having a magnitude greater than or equal to the second time interval (S53). When the input signal has N or more times of rest periods having a magnitude greater than or equal to the second time interval, the input signal is determined as a data signal (S54). On the other hand, when having less than N times of rest having a size greater than or equal to the second time interval, the current timer time and the second time interval value are again compared (S52). If the timer time is greater than the first time interval value, the input signal is determined as noise (S55).
The circuit for separating the data signal and the noise signal of FIG. 5 may be implemented in various ways. For example, it can be implemented in the following way.
A first signal is generated indicating whether the outer signal of the input signal exceeds the reference level. In this case, the reference level may be a noise level, and an interval not exceeding this is a rest period. A second signal is generated that indicates whether this pause exceeds a second time interval. In addition, a third signal is generated indicating whether the second signal has at least N rest periods within the first time interval. If it is determined as a noise signal according to the third signal, the squelch signal is turned on, and if it is determined as a data signal, the squelch circuit is turned off to output only the data signal.
6 is a diagram illustrating an embodiment of a signal determination module of an infrared wireless receiver. Referring to FIG. 6, when the signal received by the infrared receiver is input to the
That is, whether or not the resting period exceeding the second time interval, which is the reference value of the resting period, is N or more times in the first time interval, which is a set value of one period with respect to the infrared data signal, with respect to the input signal to the
In this case, setting values of the first time interval and the second time interval may be set according to the format of the infrared data signal. Referring to the infrared transmission / reception system currently used, the first time interval is 200 ms, the second time interval is 20 ms, N preferably has a value of 1.
According to the present invention, it is possible to clearly distinguish and remove a noise signal from an input signal, and also to properly control a determination time interval value and a pause reference value, thereby maintaining a stable gain value regardless of the shape of various data signals. There is an effect that can increase the reliability of the performance.
As described above, the optimum embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.
The present invention may be applied to an infrared receiver which is widely used as a remote control receiver of a home appliance, and may be used for other reception control methods for removing noise.
1 is a diagram illustrating an embodiment of a noise cancellation method using an amplification gain adjustment scheme according to the related art.
2 is an explanatory diagram showing a form of noise generated by a luminaire or the like.
3 is an explanatory diagram showing a form of a data signal transmitted from an infrared transmitter.
4 is an exemplary explanatory diagram showing a level of signal strength.
5 is a flowchart illustrating a method of distinguishing a data signal from a noise signal.
6 is a diagram illustrating an embodiment of a signal determination module of an infrared wireless receiver.
Claims (13)
Priority Applications (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 |
| CN200880114554A 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 |
| 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 |
Applications Claiming Priority (1)
| 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 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020080125037A Division KR20090045136A (en) | 2008-12-10 | 2008-12-10 | Control method and circuit for receiving signals in infrared receiver for remote control and infrared receiver having the control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20090043728A KR20090043728A (en) | 2009-05-07 |
| KR100976404B1 true KR100976404B1 (en) | 2010-08-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 |
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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08279784A (en) * | 1995-04-05 | 1996-10-22 | Sharp Corp | Infrared receiver |
| KR20040004031A (en) * | 2003-01-08 | 2004-01-13 | 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 |
Family Cites Families (6)
| 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 |
| JPH08505506A (en) * | 1993-10-28 | 1996-06-11 | フィリップス エレクトロニクス ネムローゼ フェン ノートシャップ | Remote control systems, lighting systems and filters |
| DE19642149A1 (en) * | 1996-10-12 | 1998-04-23 | Telefunken Microelectron | Data transmission system |
| 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 |
-
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 (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08279784A (en) * | 1995-04-05 | 1996-10-22 | Sharp Corp | Infrared receiver |
| KR20040004031A (en) * | 2003-01-08 | 2004-01-13 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009057971A1 (en) | 2009-05-07 |
| CN101843013A (en) | 2010-09-22 |
| KR20090043728A (en) | 2009-05-07 |
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