JP2014192788A - Remote controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remote controller having high noise resistance by removing the effects of noise from a noise-affected single frame of command code and estimating the original signal.SOLUTION: A step is included in which a signal at the (2n+1) T'th time of a specific command code correlated to the operation of an apparatus to be operated on is extracted, and a converted specific code composed of a list of low levels as "0s" and high levels as "1s" is compared with a converted reception code created in the same way from a received command code. If the converted reception code matches the converted specific code, or if, when all "1s" in non-matching digits of the converted reception code and the converted specific code are changed to "0s," the converted reception code matches the converted specific code, then the specific command code is extracted as a valid code.

Description

  The present invention relates to a remote control device, and more particularly to a remote control device that is mounted on an electronic device and performs arithmetic processing on a received remote control signal.

  Conventional remote control signals include a custom code associated with an individual device, a data code associated with a specific function of the device, an inverted data code obtained by inverting (complementing) the data code, It is composed of a frame that includes Conventionally, it is generally configured that a function corresponding to a data code is executed when it is determined whether or not the data code and the complement of the inverted code match.

  Remote control communication is easily affected by noise due to external light or the like, and the data code and the complement of the inverted code often do not match. A signal processing method has been devised to eliminate the influence of such noise and enable control of the device. For example, in Patent Document 1, when signals of the same frame are continuously transmitted, even if the data code and the complement of the inverted data code do not match, the normal signal is received within a predetermined time. In addition, a configuration is disclosed in which when a command corresponding to a function having one of the complement of the data code and the inverted data code is matched, the function is executed.

  Alternatively, it is attempted to always transmit the same command code continuously for two frames, and to estimate a signal affected by noise using a logical operation based on a comparison of signals of two frames.

Japanese Patent No. 3421622

  The method described in the cited document 1 cannot be applied when the same signal is not transmitted continuously. In addition, the data code and / or the inverted data code affected by the noise is ignored as a noise countermeasure, and the signal is not estimated by removing the influence of the noise. In particular, when both the data code and the inverted code are affected by noise, or when a plurality of consecutive signal frames are affected by noise, noise resistance is not exhibited.

  Although it is possible to estimate a signal affected by noise by using a logical operation based on a comparison of command codes of two frames, in this system, a code obtained by estimation from a signal of two frames is This is only for one frame, and noise resistance is not improved for the signal of each frame. Since only one frame of information is extracted from a two-frame signal, the amount of information is reduced and the efficiency of signal processing is not high. In addition, since this method uses the comparison of two frames as a principle of signal estimation, it is very difficult to perform estimation when the same part of two frames is affected by noise. If the signal can be estimated with only one frame of information, it is considered that high noise resistance can be obtained.

  In view of the above situation, the problem to be solved by the present invention is to remove the influence of noise from a single frame command code affected by noise and estimate the original signal, thereby providing a remote controller having high noise resistance. To provide an apparatus.

In order to solve the above problems, a remote control device according to the present invention includes a transmission unit that transmits a remote control signal, a reception unit that receives a remote control signal transmitted from the transmission unit, and outputs the signal as a calculation signal; A calculation unit that receives the calculation signal and performs calculation processing on the calculation signal. When the unit time is T, the calculation signal is obtained from the L level at time T and the H level at time T. The logic “0” having a waveform or a logic “1” having a waveform consisting of an L level at a time T and an H level at a time 3T, followed by an a digit custom code determined for each device, and an operation target It includes a b-digit data code indicating the content of the instruction to the device, an inverted data code consisting of the complement of the data code, and a command code consisting of the following, and executes the following steps 1 to 5 And by, and summarized in that the arithmetic unit processes the operation signal.
(Step 1) As a natural number including 0, a signal at the (2n + 1) T time of the command code is extracted, and a converted received code is obtained by arranging the L level as “0” and the H level as “1”.
(Step 2) It is represented by the sum S1 of the number of “0” and the number of “1” of the converted reception code obtained in Step 1, and a + 3b + (the number of “1” of the custom code unique to the remote control device). It is determined whether the number S2 matches.
(Step 3) When S1 and S2 match in Step 2, the signal at the (2n + 1) T time of the specific command code associated with the operation of the operation target device is extracted, and the L level is set to “0”. The conversion specific codes arranged with the H level set to “1” are compared with the conversion reception code, and when the conversion reception code matches the conversion specific code, or does not match the conversion specific code of the conversion reception code When all the digit “1” s are converted to “0”, if the converted received code matches the converted specific code, the specific command code is extracted as a matching code.
(Step 4) An instruction corresponding to the matching code extracted in the step 3 is given to the operation target device.
(Step 5) If S1 and S2 do not match in step 2, or if no matching code is extracted in step 3, the calculation signal is invalidated.

Here, the step 3 preferably includes the following step 3A.
(Step 3A) The number S3 of “1” s in the array A1 obtained by exclusive OR of the converted received code and the converted specific code is represented by a + 2b− (the number of “0” of the converted received code). It is determined whether or not it matches the number S4.

  In the remote control device according to the present invention, the signal that is affected by significant noise such as missing the beginning and / or end of the command code or the signal that the custom code may not match is eliminated in step 2. Then, in step 3, the command code is estimated by removing the influence of noise. In step 3, when the conversion reception code matches the conversion specific code, a signal matching the specific command code giving the conversion specific code is transmitted from the transmission unit and received by the reception unit without being affected by noise. It is judged that it was done.

  On the other hand, most of the influence of the noise received by the calculation signal in the remote control communication is that the original L level changes to the H level (L → H), and the conversion reception code when the influence of such noise is received. In FIG. 3, the digit that was “0” is “1” if no noise is received. Therefore, in step 3, even if the conversion reception code does not match the conversion specification code obtained from a specific command code, the conversion specification can be specified by replacing all “1” s in the conversion reception code that do not match with “0”. If it matches the code, it can be estimated that a command code that matches the specific command code is transmitted from the transmitter and received by the receiver under the influence of noise.

  In this way, the original command code from which the influence of noise has been removed can be obtained using only a single frame command code, and high noise resistance can be obtained without requiring multiple frames of information for noise removal. Can be obtained. Therefore, high noise resistance can be obtained even in a communication format in which a plurality of frames are not transmitted, and when a command code of a plurality of frames is transmitted, a command code estimated for each frame is collated between the plurality of frames. As a result, noise resistance can be further improved. Even when the same portion of consecutive frames is affected by noise, the command code can be estimated.

  Here, when the step 3 includes the step 3A, in the step 3A, the number S3 of mismatches between the converted received code and a certain conversion specific code is “0” which should be originally included in the converted received code. By confirming that it matches the number S4 of “1” due to the L → H noise, the conversion specific code is affected by the L → H noise. It can be determined that the received code. In this way, through the step 3A, the conforming code can be extracted by a simple logical operation process. Since the calculation amount is small, the time required for processing can be shortened.

It is a key map of the remote control device concerning the embodiment of the present invention. It is the flowchart which showed the processing process of the signal for a calculation. It is a flowchart which shows the detail of the method of the suitable code estimation in step st7 of FIG. (A) shows the waveforms of logic “0” and logic “1” output from the receiving unit, and (b) shows the output waveform of the receiving unit corresponding to the received command code “1000011”. (C) shows the converted reception code at that time. It is a figure for demonstrating the method of judging the value which performs a suitable code estimation, (a) Reception command code R which received no noise, (b) Reception command code R1 which received noise at the head part, (c) The received command code R2 whose custom code does not match is shown together with the conversion code. It is a figure for demonstrating the estimation method of a conformity code, (a) Reception command code R which did not receive noise, (b) Reception command code R 'which received noise in the middle part, (c) Specific command code C1 , (D) The specific command code C2 is shown together with the conversion code. It is the figure which showed the procedure which determines the coincidence with conversion specific code c1 and c2, respectively about the conversion reception code r which received noise, and the conversion reception code r'1 which received noise.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, logic level signal data is indicated by “”, and conversion data described later is indicated by “”. Also, in each figure, the converted data is represented by arranging items containing numerical values “0” and “1” in a square frame.

  As shown in FIG. 1, the remote control device 1 according to the present embodiment is an infrared remote control device including a transmission unit 10, a reception unit 20, and a calculation unit 30. The transmission unit 10 receives a button operation of the apparatus user and transmits a remote control signal (signal data) that causes the operation target device 90 to perform an operation based on the button operation to the reception unit 20. The receiver 20 receives the remote control signal transmitted from the transmitter 10 and outputs it to the calculator 30 as a calculation signal that is an electrical signal. The remote control light receiving module provided in the receiving unit 20 generally calculates an optical signal received as an L level signal as an H level electrical signal and an optical signal received as an H level signal as an L level electrical signal. To the unit 30. That is, the receiving unit 20 inverts the L level and the H level of the received remote control signal and outputs the inverted signal to the calculating unit 30 as a calculation signal. Here, the L level is a relatively low signal level, and the H level is a relatively high signal level.

  In the remote control device 1 of the present embodiment, the calculation signal input to the calculation unit 30 has a waveform as shown in FIG. That is, when the receiving unit 20 receives normal data that is not affected by noise or the like and outputs a calculation signal to the calculation unit 30, the logic “0” is an L level signal at time T and the subsequent time. A logic “1” has an L level signal at time T, followed by an H level waveform at time 3T. The unit time T is, for example, 0.56 milliseconds.

  A calculation signal that is input to the calculation unit 30 and used for calculation is configured in units of frames. Each frame includes a command code. The command code includes a custom code, a data code, and an inverted data code. The custom code is a code for identifying a device defined for each type or individual of the operation target device 90. The data code is a code for causing the operation target device 90 to perform a predetermined operation. The inverted data code consists of the complement of the data code. That is, the data code includes “0” as “1” and “1” as “0”. The signal of each frame may have a leader code indicating that the command code is started prior to the command code. Still further, a stop code may be included at the end of each frame. In the present embodiment, signals of two frames are continuously output from the transmission unit 10 and input to the calculation unit 30.

  Remote control signals made of infrared rays are easily affected by infrared noise derived from fluorescent lamps and the like. In order to remove this influence, the receiving unit 20 of the remote control device usually has a filter for infrared rays. In an environment with a lot of infrared noise, the filter level is set high. In such a case, the remote control signal received by the receiving unit 20 may be processed as noise. Then, the receiving unit 20 may output a signal to the computing unit 30 as an H-level computing signal, which is supposed to receive a signal input and output an L-level computing signal to the computing unit 30. . Conversely, due to the influence of noise, it is very rare to output an L level signal where it should be output as an H level signal. The present invention described in detail below utilizes such characteristics of the remote control receiving module. Note that the command codes in the following description are all described based on the H level and L level in the calculation signal, not the remote control signal.

  The arithmetic unit 30 of the remote control device 1 according to the present invention analyzes the input arithmetic signal in a procedure including steps 1 to 5 described below, so that an L level signal is H level due to the influence of noise. The original command code (before being affected by noise) is estimated. Hereinafter, each process will be described in detail with reference to FIGS. 2 and 3 showing the processing procedure of the received signal and FIGS. 4 to 7 showing specific signal processing examples. Note that when the number of digits of the custom code is a and the number of digits of the data code and the inverted data code is b, in remote control communication that is generally used, a = b = 8. In the example shown, for simplicity, the case of a = b = 2 is treated. However, as will be understood from the following description, the present signal processing method is not particularly applicable when a = b = 2, and a similar signal processing method in which a and b are arbitrary integers of 1 or more. Can be applied.

  First, the arithmetic unit 30 starts receiving a command code (step st1). For example, as shown in FIG. 4B or the like, when a leader code in which the H level continues after the L level continues is added before the command code, the arithmetic unit 30 determines the end of the leader code. Is recognized, and the reception of the command code is started immediately after this down edge.

  Next, as step 1, a conversion reception code used for arithmetic processing is obtained from the received command code. Specifically, a signal at the (2n + 1) T time (an odd time, “n” is a natural number including 0) of the received command code (hereinafter may be referred to as a received command code) is extracted. The L level is set to “0” and the H level is set to “1” to obtain a converted reception code.

  As an example, consider the case where the received command code is “1000011” as shown in FIG. Since the custom code digit number a is 2 and the data code and inverted data code digit number b are 2, the first “10” is the custom code, the subsequent “00” is the data code, and the last “11” is the inverted data. Code. The inverted data code is a complement of the data code. Based on the waveform of the received command code, the signals at the T time, 3T time, 5T time,..., (2n + 1) T time immediately after the leader code down edge are extracted, and the L level is set to “0”. When the “H” level is arranged as “1”, it becomes “0100000101” as shown in the lowermost part of FIG. 4B and FIG. 4C. This is the conversion reception code.

  This step 1 is actually executed by steps st2 to st4 in FIG. First, in step st2, the width of the signal pulse is measured. Specifically, when a down edge is detected, the time until the next down edge is measured. In step st3, an array corresponding to the pulse width is added to the converted reception code. Table 1 shows the relationship between the measured pulse width and the array added to the converted received code, together with the corresponding received command code array. Since the logic “0” and “1” have a waveform starting from the down edge as shown in FIG. 4, the pulse width does not become 6T or 8T if there is no influence of noise. However, when the L → H noise is added to the received command code, the down edge disappears and the pulse width may become 6T or 8T. If the pulse width is 10T or more, the estimation is stopped because the influence of noise is too great to estimate a correct command code.

  Here, in the actual measurement of the pulse width, in order to eliminate the influence of the variation in pulse width and the measurement error, the pulse width is recognized by providing the measured pulse width with a width of ± T. For example, when the measured pulse width is 2T ± T, “0” is added to the converted reception code.

  The pulse width measurement in step st2 and the addition of the array to the converted reception code in step st3 are repeated until a stop code indicating the end of the command code (not shown in FIG. 4B, etc.) is detected (step st4). ) Get the conversion reception code.

  In the example of FIG. 4B, the pulse width measured as the interval between the down edges is in the order of 4T → 2T → 2T → 2T → 4T → 4T. As a result, “0100000101” is obtained, and the converted reception code shown in FIG. 4C is obtained. Further, when the corresponding reception command code is confirmed from the information of the pulse width based on Table 1, it becomes “1000011”, which matches the reception command code read from the waveform.

  In the next step st5, the number of "0" and the number of "1" are counted in the converted reception code obtained as described above for use as information in the subsequent process 2 and process 3. In the example of FIG. 4C, the number of “0” s (N0) is 6, and the number of “1” s (N1) is 3.

  Next, in step 2 (step st6), it is determined whether or not the converted received code obtained above is worth estimating the correct command code by eliminating the influence of noise. Specifically, S1 represented by the sum (N0 + N1) of the number N0 of “0” and the number N1 of “1” obtained in step st5, and a + 3b + (custom code unique to the remote control device 1) It is determined whether or not S2 represented by “the number of“ 1 ”” matches. If S1 and S2 match (S1 = S2), it is determined that it is worth estimating a correct command code, and the process 3 estimation process (step st7) and the subsequent command execution process (step st8) are performed. move on. On the other hand, if S1 and S2 do not match (S1 ≠ S2), it is determined that it is not worth estimating a correct command code, and the process proceeds to step 5 (steps st9 to st11).

  Here, S2 represents the number of digits of the converted reception code obtained from the reception command code not receiving noise. As shown in Table 1, at the time of conversion from the received command code to the converted received code, logic “0” is converted to “0” which is a one-digit array, and logic “1” is a two-digit array. Converted to “01”. Therefore, the number of digits of the array of the converted received code obtained from the custom code part of the received command code not affected by noise is a + (the number of “1” in the custom code). In addition, since the inverted data code is composed of the complement of the data code, in the portion consisting of the data code and the inverted data code of the reception command code that is not affected by noise, even if the data code has any logical arrangement, The number of “0” is b and the number of “1” is b, and the number of digits of the array of the conversion reception code obtained from this portion is 3b with b + 2b. Therefore, the number of digits of the converted received code obtained from the entire received command code not receiving noise, including the custom code portion, the data code portion, and the inverted data code portion, is a + (the number of “1” in the custom code). + 3b. This is S2. The custom code is unique to the individual remote control device 1 and is known.

  Since S1 is the number of digits counted in the received command code that is actually received, if this coincides with S2 that is the number of digits of the converted reception code when no noise is received, in step 3 below, the noise It is determined that there is a possibility that a correct command code can be estimated by removing the influence (“estimated value” in step st6). On the other hand, if S1 does not match S2, the number of digits of the converted conversion code to be obtained has been changed due to the effect of noise, or a command code of another remote control device that has no possibility of matching the custom code is received. As a result, even if the following step 3 is performed, it is determined that a correct command cannot be estimated or that it is meaningless to execute (“no estimated value” in step st6).

  When the received command code is not affected by noise, the actual digit number S1 of the converted received code naturally matches the calculated digit number S2. FIG. 5A shows an example in which the received command code R = “1000011” not receiving noise is used as the converted received code r. This example is the same as shown in FIGS. 4B and 4C. In this example, r is “0100000101”, the number N0 of “0” in r is 6, the number N1 of “1” is 3, and S1 = N0 + N1 = 9. On the other hand, since a = b = 2 and the custom code is “01”, S2 = 2 + 3 · 2 + 1 = 9. Since S1 = S2 holds, in this case, it is determined that it is worth estimating the command code, and the process proceeds to step 3 (step st7).

  FIG. 5B shows the reception command code R1 when the head of the command code of the reception command code R receives L → H noise. Since the noise n is received at the head of the command code, the original leader code is continuous with the head of the command code. The calculation unit 30 detects the down edge at the end of the reader code and starts reading the command code. In this case, the time for starting the command code reading is 4T compared to the case of the received command code R. It will be late. The conversion reception code r1 obtained from the reception command code R1 is “0000101”. In this converted reception code r1, the number N0 of “0” is 5, the number N1 of “1” is 2, and S1 = N0 + N1 = 7. This does not coincide with S2 = 9 (S1 ≠ S2). Therefore, it is determined that a part of the received command code R1 is missing due to the influence of noise and is not worth estimating the correct command code, and the process proceeds to step 5 (step st9).

  FIG. 5C shows the received command code R2 in which the custom code “10” of the received command code R is changed to “00”. When the custom code included in the received command code is different from the custom code of the remote control device 1, remote control signals of other types of devices installed near the operation target device 90 or similar devices of other individuals are received. Occurs when From the reception command code R2, the conversion reception code r2 = “0010000101” is obtained. In this converted reception code r2, the number N0 of “0” is 7, and the number N1 of “1” is 3, S1 = N0 + N1 = 10. This does not coincide with S2 = 9 (S1 ≠ S2). Therefore, it is determined that the received command code R2 does not match the original custom code unique to the remote control device 1 and is not worth estimating the correct command code, and the process proceeds to step 5 (step st9).

  On the other hand, FIG. 6B shows a received command code R ′ when receiving L → H noises n 1 and n 2 in the middle of the received command code R. FIG. 6A shows the same received command code R as shown in FIGS. 4B and 5A. When a noise of L → H is applied at the (2n + 1) T time of the received command code, “0” in the (n + 1) digit of the converted received code changes to “1” (“0” → “1”). Note that even if the signal at the (2n) T time changes from the L level to the H level due to the influence of noise or the like, there is no influence on the converted reception code. From the reception command code R ′, the conversion reception code r ′ = “011100101” is obtained. In this converted reception code r2, the number N0 of “0” is 4 and the number N1 of “1” is 5, S1 = N0 + N1 = 9. This is consistent with S2 = 9 (S1 = S2). In this case, it is determined that it is worth estimating the correct command code based on the converted reception code r ', and the process proceeds to step 3 (step st7).

  If it is determined in step 2 (step st6) that it is worth estimating the correct command code as in the case where the received command code R or R ′ in the above example is received, in step 3 (step st7). Estimation is performed, and a correct command code (conformance code) is estimated. When the matching code is extracted, a command corresponding to the matching code is sent to the operation target device 90 in step 4 (step st8). Details of step 3 (step st7) will be described later.

  On the other hand, if it is determined in step 2 (step st6) that it is not worth estimating the correct command code, as in the case where the received command codes R1 and R2 in the above example are received, the process proceeds to step 5. That is, in step st9, it is determined which frame corresponds to the frame in which the command code is transmitted in succession. If the received command code is for the first frame, the received command code for that frame is invalidated in step st10 to prepare for reception of the subsequent second frame. On the other hand, if the received command code is for the second frame, in step st11, the received command code for that frame is invalidated, and no further processing is performed assuming that reception has failed. In this case, it waits until a user transmits a remote control signal from the transmission part 10 again.

  Next, a method for estimating a matching code in step 3 (step st7) will be described. In step 3, a conversion reception code obtained from a reception command affected by noise and a conversion specific code obtained from a specific command code associated in advance with each operation of the operation target device 90 on which the remote control device 1 is mounted. Based on the comparison, a converted reception code before receiving noise is estimated and extracted as a matching code. The specific command code is associated with each operation of the operation target device 90, for example, the command code C1 corresponds to executing the function 1 of the operation target device 90, and the command code C2 is the function 2 It means to correspond to execute.

  With reference to the example shown in FIG. 6, a method for estimating a matching code will be described. As the specific command code, the specific command code C1 in FIG. 6C and the specific command code C2 in FIG. 6D are considered. In the same manner as when the conversion reception code is generated from the reception command code, conversion specific codes c1 and c2 are respectively generated from the specific command codes C1 and C2. That is, the signals at the (2n + 1) T time of the specific command codes C1 and C2 are extracted, and the conversion specific codes c1 and c2 are obtained by arranging the L level as “0” and the H level as “1”.

  In estimating the matching code, the noise added to the received command code is changed from L → H and the converted received code is changed from “0” → “1” based on the noise characteristics in the remote control signal as described above. ”And only those that change. First, consider the case of a received command code that is not subject to noise. In this case, if a remote control signal matching a specific command code is transmitted, the converted reception code obtained should match the conversion specific code obtained from the specific command code. Therefore, if a conversion specific code that completely matches the conversion reception code is searched, a specific command code that gives the conversion specific code can be extracted as a matching code. In the example of FIG. 6, the conversion reception code r completely matches the conversion specific code c2 obtained from the specific command code C2. That is, the specific command code C2 is extracted as the matching code.

  Next, consider a case where the received command code is affected by noise. As described above, the influence of noise in the converted reception code is only that which changes from “0” to “1”. Therefore, when a command code that matches a specific command code is transmitted and received under the influence of noise, the conversion reception code obtained does not match the conversion specific code created from the specific command code. Should be the content that the digit of “0” in the conversion specific code has changed to “1”. On the contrary, in the conversion reception code, if all the digits “1” that do not match the conversion specific code are converted to “0”, when the conversion specific code matches, the specific command code that gives the conversion specific code is It can be assumed that it matches the code sent before it was affected. In the example of FIG. 6, the third and fourth digits of the conversion reception code r ′ = “011100101” do not match the conversion specific code c2 = “0100000101”. These digits of the converted received code r ′ are all “1”, and when the “1” is converted to “0”, the converted received code r ′ becomes “0100000101”, which matches the converted specific code c2. Therefore, the specific command code C2 can be extracted as a matching code. On the other hand, the conversion reception code r ′ = “011100101” does not coincide with the conversion specific code c1 = “010010100” in the third, fourth, fifth, and ninth digits, and one of these digits is “1”. When converted to “0”, the conversion reception code r ′ becomes 010000100, which does not match the conversion specific code c1, and therefore the specific command code C1 is not a conforming code.

  As described above, when the converted reception code obtained by receiving the remote control signal is compared with a predetermined conversion specific code group, when the conversion received code completely matches a certain conversion specific code, or in the conversion received code If all of the digits “0” that do not match a certain conversion specific code are converted to “1”, the specific command code that gives the conversion specific code is extracted as a conforming code. It can be used to operate the operation target device 90. If the number of digits of the command code is small and the number of specific command codes is small as in the example of FIG. 6, the conversion received code and the conversion specific code “0” and “1” arrays are directly compared in this way. Although it is possible to extract the conforming code, this becomes difficult when the number of digits of the command code increases and the types of specific command codes increase. In that case, it is preferable to simply extract the compatible code using a logical operation.

  A method for estimating a matching code using a logical operation will be described with reference to FIGS. Each conversion reception code and conversion specific code used for the calculation in FIG. 7 are the same as those shown in FIG. When estimation is started in step st7-0, it is determined in turn from the conversion specific code c1 (step st7-1) whether or not the conversion specific code ci can be a candidate for a matching code. Here, i is a natural number from 1 to the total number N of specific command codes.

  In step st7-2, the arithmetic unit 30 executes step 3A. Here, first, an exclusive OR (XOR) of the converted received code r ′ (including the case where it matches the converted received code r. The same applies in the description of FIG. 3 below) and the converted specific code ci is obtained, and the array A1 (r ', Ci) = r' XOR c1 is created. The number of “1” s in the array A1 (r ′, ci) is S3. Further, it is determined whether or not S3 matches the number S4 represented by S4 = a + 2b− (the number N0 of “0” in the converted reception code r ′). In exclusive OR, a digit in which one of the two arrays to be compared is 1 is 1, and the other digits are 0.

  FIGS. 7A and 7B show a case where the received command code is not affected by noise and the converted received code r ′ is equal to the converted received code r. In this case, as shown in FIG. 7A, the array A1 (r, c1) is “000010001”, and the number S3 of “1” s in this array is 2. On the other hand, since a = b = 2, S4 = 2 + 2 + 2-6 = 0. Therefore, S3 ≠ S4 (determination: x). On the other hand, as shown in FIG. 7B, A1 (r, c2) is “000000000000”, and the number S3 of “1” s in this array is zero. Therefore, S3 = S4 (= 0) (determination: ◯).

  FIGS. 7C and 7D show calculation examples in step 3A for the converted received code r 'when the received command code is affected by noise. In this case, as shown in FIG. 7C, the array A1 (r ′, c1) is “001110001”, and the number S3 of “1” s in this array is 4. On the other hand, S4 is 2 + 2 + 2-4 = 2. Therefore, S3 ≠ S4 (determination: x). On the other hand, as shown in FIG. 7D, A1 (r ′, c2) is “001100000”, and the number S3 of “1” s in this array is 1. Therefore, S3 = S4 (= 2) (determination: ◯).

  Here, what is meant by the determination in step 3A is considered. In the XOR operation, 1 is placed in the digit where the two arrays to be compared do not match, so in the array A1 (r ′, ci), the conversion reception code r ′ does not match the conversion specific code ci. “1” is arranged in the digit, and “0” is arranged in the matching digit. Therefore, the number S3 of “1” in the array A1 (r ′, ci) indicates the number of digits that do not match the conversion specific code ci in the conversion reception code r ′. On the other hand, S4 indicates the number of digits changed from “0” to “1” due to the influence of noise in the converted reception code r ′. This is because when the conversion reception code r ′ is generated, “0” of the reception command code R ′ is converted to “0” and “1” is converted to “01” (see Table 1). The conversion reception code r that is not received should contain only “a + 2b”, which is the same as the number of digits of the reception code R, from which “0” is actually included in the conversion reception code r ′. This is because if the number is reduced, the number of digits that originally changed from “0” to “1” due to noise can be found. Therefore, when S3 = S4, it indicates that the number of digits that do not match the conversion specific code ci in the conversion reception code r ′ is equal to the number of digits affected by noise. In other words, the conversion received code r that should originally match the conversion specific code ci is changed to r ′ due to the noise of “0” → “1” in some digits, so that it matches the conversion specific code ci. Indicates that it may have disappeared. Therefore, in the conversion reception code r ′, if the digit “1” in which the “1” is arranged in the array A1 (r ′, ci) is converted to “0”, it matches the conversion specific code ci. . On the other hand, when S3 ≠ S4, the number of digits that do not match the conversion specific code ci in the conversion reception code r ′ is different from the number of digits affected by noise, and there is no such possibility. It is shown that.

  If S3 = S4 in FIG. 3 (Yes in step st7-2, (b) and (d) are applicable in the example of FIG. 7), a specific command that gives the conversion specific code ci in step st7-3 The code Ci is stored as a candidate for a matching code. Then, if ci examined here is not the last conversion specific code cN (No in step st7-6), step 3A is executed for the next conversion specific code c (i + 1) (step st7-7 → step st7). -2).

  On the other hand, if S3 ≠ S4 (No in step st7-2, (a) and (c) in FIG. 7 correspond to this case), the specific command code Ci that gives the conversion specific code ci is an applicable code. Judge that there is no possibility of being a candidate. Then, if ci examined here is not the last conversion specific code cN (No in step st7-4), the same determination is performed for the next conversion specific code c (i + 1) (step st7-5 → step st7). -2).

  Referring to the example of FIG. 7, the condition of S3 = S4 is set for the conversion specific code c2 in either the calculation using the conversion reception code r not receiving noise or the calculation using the conversion reception code r ′ receiving noise. The specific command code C2 is a candidate for a matching code. That is, even if the received command code R receives noise, the specific command code C2 that matches the original received command code R ′ can be specified as a candidate for a compatible code.

  When the examination for all N conversion specific codes ci is completed (Yes in steps st7-4 and st7-6), the number of specific command codes stored as candidates for matching codes is 1 in step st7-8. Determine whether or not. If this number is 1 (Yes in step st7-8), it is estimated that the specific command code that is the candidate is the only specific command code that matches the received command code R before receiving noise, In step st7-9, it is extracted as a matching code. Then, in step st8 of FIG. 2, a command corresponding to the specific command code is sent to the operation target device 90.

  On the other hand, if the number of specific command codes stored as candidates for the matching code is not 1 (No in step st7-8), it is determined in step st7-10 that the matching code cannot be estimated, and Considering that the received command code of the frame is invalid, the process proceeds to step st9 in FIG. 2 (wiring not shown in FIG. 2). Here, the case where the number of specific command codes stored as candidates for compatible codes is not 1 includes both the case where there is no candidate compatible code and the case where there are two or more candidate code. The case where there is no candidate is actually estimated even if it is judged that it is worth estimating the matching code in step 2 (step st6) due to, for example, receiving noise of H → L. Corresponding to the case that could not be done. In this case, if it is the first frame, there is a possibility that the estimation can be performed correctly when the command code of the second frame is read. On the other hand, the case where there are two or more candidates indicates a case where, for example, there are two or more very similar conversion specific codes, so that the matching codes cannot be narrowed down by estimation. Such a situation can be avoided by assigning a specific command code so that the conversion specific codes are not similar to each other. If such measures are taken, the probability that the matching code cannot be correctly estimated when a signal of two frames is received can be suppressed to a very low level.

  As described above, in this remote control device 1, the number of “0” and “1” included in the converted reception code is constant as long as the noise is only L → H type and no noise is received. As a principle, unless the command code is receiving noise at the beginning or there is no possibility that the custom code matches, the converted received code that received the noise is not affected by the noise. A specific command code that matches the received command code in the state is estimated as a matching code. This estimation is not performed by comparing command codes of two frames or more, but is performed based on information of only a single frame command code. Moreover, even if noise is added to the same portion of consecutive frames, the matching code can be estimated. Thus, according to the calculation method of the remote control device 1, high noise resistance is exhibited.

  Even when a signal of two frames is transmitted continuously as in a conventional remote control device, if the conforming code can be extracted in the first frame, the conforming code is not read without reading the second frame itself. A command corresponding to the above may be sent to the operation target device 90. Thereby, the time required for analyzing the received signal can be shortened. Alternatively, even if the conforming code can be extracted in the first frame, if the signal in the second frame is read and the conforming code is extracted in the same manner, it is confirmed whether the two conforming codes match. Thus, the resistance to noise can be further increased. On the other hand, even if the matching code cannot be extracted in the first frame due to receiving noise at the beginning of the command code, the matching code can be estimated from the information of a single frame. The eye may be able to extract the matching code.

  Further, by performing the extraction of the conforming code using the logical operation in step 3A, the conforming code can be extracted by a simple arithmetic process. As a result, it takes less time to extract the matching code.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment at all, A various change is possible in the range which does not deviate from the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Remote control device 10 Transmission part 20 Reception part 30 Calculation part 90 Operation object apparatus

Claims (2)

A transmitter that transmits a remote control signal, a receiver that receives the remote control signal transmitted from the transmitter and outputs the signal as a calculation signal, and an arithmetic operation that receives the calculation signal and performs arithmetic processing on the calculation signal And comprising
When the unit time is T, the calculation signal is a logic “0” having a waveform composed of an L level at time T and an H level at time T, or an L level at time T and an H level at time 3T. A logic “1” having a waveform consisting of a level is assumed to be one digit, an a digit custom code determined for each device, a b digit data code indicating the content of an instruction to the operation target device, and the complement of this data code Comprising an inverted data code and a command code consisting of
The remote control device according to claim 1, wherein the calculation unit processes the calculation signal by performing the following steps 1 to 5.
(Step 1) As a natural number including 0, a signal at the (2n + 1) T time of the command code is extracted, and a converted received code is obtained by arranging the L level as “0” and the H level as “1”.
(Step 2) It is represented by the sum S1 of the number of “0” and the number of “1” of the converted reception code obtained in Step 1, and a + 3b + (the number of “1” of the custom code unique to the remote control device). It is determined whether the number S2 matches.
(Step 3) When S1 and S2 match in Step 2, the signal at the (2n + 1) T time of the specific command code associated with the operation of the operation target device is extracted, and the L level is set to “0”. The conversion specific codes arranged with the H level set to “1” are compared with the conversion reception code, and when the conversion reception code matches the conversion specific code, or does not match the conversion specific code of the conversion reception code When all the digit “1” s are converted to “0”, if the converted received code matches the converted specific code, the specific command code is extracted as a matching code.
(Step 4) An instruction corresponding to the matching code extracted in the step 3 is given to the operation target device.
(Step 5) If S1 and S2 do not match in step 2, or if no matching code is extracted in step 3, the calculation signal is invalidated. The remote control device according to claim 1, wherein the step 3 includes the following step 3A.
(Step 3A) The number S3 of “1” s in the array A1 obtained by exclusive OR of the converted received code and the converted specific code is represented by a + 2b− (the number of “0” of the converted received code). It is determined whether or not it matches the number S4.

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