JP2008072546A - Remote control signal receiver and video display device having the same receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a reaction of a receiver to a remote control signal and to prevent malfunction only by performing an easy operation. <P>SOLUTION: In a remote control signal processing IC 12, prescribed decision criteria are provided about the respective items of pulse width, the number of pulses and a code end period of the remote control signal and pulse waveform matched to the decision criteria is decoded when the received remote control signal is decoded. Then, an MCU 13 varies the decision criteria when decoding is not successful for over specified frequencies in the decision criteria set first. Namely, the respective decision criteria are sequentially widen to raise sensitivity of the decoding. Variation of the decision criteria can be gradually performed for a plurality of frequencies until the decoding continuously succeeds for the specified frequencies. Then, the decision criteria when the decoding continuously succeeds for the specified frequencies are set in the receiver to perform decoding processing of the remote control signal afterward. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a remote control receiving device and a video display device including the device, and more specifically, a remote control that improves the operability of the remote control by changing the decoding condition according to the reception state of the remote control signal. The present invention relates to a signal receiving device and a video display device including the remote control signal receiving device.

  Systems are generally provided that can control electrical devices such as home appliances with a remote controller. Regarding prior art using a remote controller, for example, Patent Document 1 discloses a remote control reception including a detection circuit that detects a received infrared signal and a detection sensitivity adjustment circuit that adjusts detection sensitivity according to an input signal level to the detection circuit. A circuit is disclosed. This detection sensitivity adjustment circuit performs an adjustment operation when signals to be detected are continuously given.

Patent Document 2 includes a plurality of light receiving elements that receive light from a plurality of different directions, and is provided with light receiving sensitivity adjustment means for adjusting the light receiving sensitivity for each light receiving element and selecting the light receiving direction of the receiver. A wireless system is disclosed.
Further, Patent Document 3 discloses an air conditioner that determines whether or not the reception signal of the reception unit is due to transmission from the remote control device, and that the reception sensitivity of the reception unit is lowered when the determination result is negative. ing.

Further, in Patent Document 4, the reception sensitivity of the optical wireless receiver is reduced by a certain level for a predetermined time after the power supply to the wireless receiver is turned on, and after the predetermined time has elapsed, the reception sensitivity is restored to the normal level. A sensitivity adjustment method as described above is disclosed.
Furthermore, Patent Document 5 selects either one of a receiving unit in which a plurality of light receiving sensors having different sensitivities for receiving command signals and a light receiving output signal derived from each light receiving sensor are selected, and this is selected as the next stage. There is disclosed a remote control device provided with a changeover switch for supplying to a remote control signal receiving circuit provided in the device.

Further, in Patent Document 6, the receiving sensitivity is improved by displaying the direction of moving the receiving device on the display of the receiving device by a symbol or a character pattern, or lighting the light emitting means provided in the receiving device. A receiving apparatus that can be installed at a position is disclosed.
JP-A-60-153238 JP-A 63-208395 Japanese Patent Laid-Open No. 2-179096 Japanese Patent Laid-Open No. 2-180496 Japanese Utility Model Publication No. 4-76744 JP 2005-354343 A

  When controlling an electrical device using a remote controller, there has been a problem that the operability of the remote controller is affected by the usage environment. For example, the reception accuracy of the received signal of the remote controller is affected by the distance and angle between the remote controller and the receiving device, a shielding object, and the like, and is also affected by noise emitted from a fluorescent lamp or the like. Depending on the use environment, there has been a problem that the response of the receiving device in response to the remote control operation becomes worse.

  Regarding the operation system using the remote control device as described above, for example, the remote control receiving circuit of Patent Document 1 only adjusts the detection sensitivity in accordance with the input signal level of the remote control signal. There is a problem that it cannot be determined. In addition, the wireless system disclosed in Patent Document 2 requires a plurality of light receiving units, which complicates the circuit.

  Further, in Patent Document 3, there arises a problem that when the reception sensitivity of the receiving unit is lowered, a normal remote control signal is not effective. In addition, the sensitivity adjustment method of Patent Document 4 reduces the reception sensitivity only for a certain period when the receiver is turned on, and the effectiveness of the remote control signal is not improved during normal operation. Furthermore, since the remote control device of Patent Document 5 requires a plurality of light receiving units, the circuit becomes complicated. Furthermore, the receiving device of Patent Document 6 has a configuration for adjusting the position of the receiving device, and the effectiveness of the actual remote control signal is not improved.

  For example, when adjusting the sensitivity of the remote controller using an existing code, it is necessary to input the code after switching to the adjustment mode so that the existing code does not operate. For this reason, there is a problem that the labor for mode switching increases and a complicated operation is required before an appropriate adjustment state is reached.

  The present invention has been made in view of the above circumstances, and by changing the decoding reference according to the reception state of the remote control signal, the response of the receiving apparatus to the remote control signal is improved by a simple operation, and malfunction is prevented. It is an object of the present invention to provide a remote control receiver that can be used.

  In order to solve the above-described problem, a first technical means of the present invention is to apply a predetermined criterion value to a received remote control signal in a remote control signal receiving apparatus that decodes a remote control signal transmitted from the remote control apparatus. , A decoding means for performing decoding processing for generating code data from a pulse waveform that meets the judgment criteria, and a judging means for judging whether or not the decoding of the remote control signal by the decoding means has succeeded, the decoding means comprising a remote control signal When the decoding is not successful, the range of the determination reference value is changed.

  According to a second technical means, in the first technical means, the remote control signal receiving device automatically shifts to a predetermined adjustment mode in accordance with a predetermined remote control signal transmitted from the remote control device. In the adjustment mode, it is determined whether or not the decoding of the remote control signal dedicated for adjustment is successful.

  According to a third technical means, in the first or second technical means, the decoding means continuously decodes the remote control signal continuously, and the judging means determines that the remote control signal is successfully decoded when the decoding succeeds more than a specified number of times. It is characterized in that it is determined that the decoding of has succeeded.

  In the fourth technical means, in any one of the first to third technical means, when the determination means determines that the decoding based on the initial value of the determination reference value is not successful, the decoding means determines the determination reference value This is characterized in that the decoding is performed again with the range expanded, and the determination reference value when the decoding is successful is set as the determination reference value used for decoding and decoding is performed.

  According to a fifth technical means, in the fourth technical means, the maximum allowable range is determined in advance as the determination reference value, and the decoding means determines the determination reference step by step from the initial value when the decoding by the initial value is not successful. If the decoding is not successful even if the range of values is expanded and the range is expanded to the maximum allowable value, the determination reference value is set to the initial value and decoding is performed.

  According to a sixth technical means, in any one of the first to fifth technical means, the determination reference value is set for each item of the pulse width of the remote control signal, the number of pulses, and the period of the code end. The means is characterized in that decoding is performed on a pulse waveform corresponding to each determination reference value.

  In the seventh technical means, in the sixth technical means, if the remote control signal is not successfully decoded at the initial value of the determination reference value, the decoding means selects any one of the items for which the determination reference value is set. For the above, when the range of the judgment reference value is changed and the decoding is not successful even if the range of the judgment reference value is changed, the judgment reference values of other items are changed.

  An eighth technical means is the sixth technical means, wherein the decoding means changes the range of the determination reference value for any item among the items for which the determination reference value is set, and changes the range of the determination reference value. This is characterized in that after the setting of the determination reference value for the selected item is completed, the determination reference value of the other item is changed.

  The ninth technical means is characterized in that predetermined video display processing is performed in accordance with any one of the first to eighth technical means and code data decoded by the remote control signal receiving device.

  According to the present invention, by changing the decoding reference of the remote control signal according to the reception state of the remote control signal, the response of the receiving device to the remote control signal can be improved by simple operation and the malfunction can be prevented. .

  In particular, according to the present invention, the decoding process conditions can be corrected according to the usage environment of the remote control, so that the operability of the remote control can be improved. As a result, a useless operation such as repeated remote control operations is not forced, and the built-in battery is not wasted.

  Further, when implementing the present invention, it is not necessary to change the circuit from the conventional apparatus, and the effect of not incurring costs can be obtained.

  Furthermore, according to the present invention, since the decoding reference of the remote control signal is automatically adjusted simply by inputting a remote control signal dedicated for adjustment, the effectiveness of the remote control can be adjusted with a simple operation.

FIG. 1 is a block diagram showing a configuration example of a remote control signal receiving apparatus according to the present invention, and shows an example in which the remote control signal receiving apparatus according to the present invention is applied to a television apparatus equipped with a digital tuner. The television apparatus of this example corresponds to an example of the video display apparatus of the present invention.
The television device 1 includes a light receiving unit 11 that receives a remote control signal transmitted from a remote control device 2 operated by a user. The remote control signal received by the light receiving unit 11 is decoded into a remote control code by the remote control signal processing IC 12 and sent to an MCU (Micro Controller Unit) 13. The MCU 13 executes a predetermined control process associated with the remote control code obtained by decoding the remote control signal.

The tuner 17 tunes and demodulates the received broadcast signal. The external input unit 18 includes a terminal for inputting a video signal / audio signal from an externally connected AV device or PC, and enables signal input from the external device.
The video processing IC 19 processes the video signal separated from the broadcast signal selected by the tuner 17 or the video signal input from the external input unit 18 and outputs a video signal for display on the display 15. Here, necessary video processing (for example, color space conversion processing, IP conversion processing, scaling processing, FRC processing, γ correction processing, color correction processing, synchronization detection processing, etc.) is performed according to the format of the input video signal. The display device driver 14 drives the display 15 based on the video signal output from the video processing IC 19 and displays the video signal on the display 15. The display 15 is a display device including a liquid crystal panel, for example.
The audio processing IC 20 amplifies the audio signal separated from the broadcast signal selected by the tuner 17 or the audio signal input from the external input unit 18 and converts it into an output signal, and the speaker 21 converts the output signal. Output audio.

  The remote control signal decoding process according to the present invention is executed by the remote control signal processing IC 12 and MCU 13. That is, the remote control signal dedicated for adjustment transmitted from the remote control device 2 is decoded by the remote control signal processing IC 12, and the MCU 13 determines whether or not the remote control signal is correctly decoded, and in the remote control signal processing IC 12 according to the determination result. Change the decoding conditions. Therefore, the decoding means of the remote control signal receiving apparatus according to the present invention is realized by the remote control signal processing IC 12, and the determination means of the present invention for determining whether or not the decoded code data is correctly decoded is realized by the MCU 13.

FIG. 2 is a block diagram showing another configuration example of the remote control signal receiving apparatus according to the present invention, and shows another example in which the remote control signal receiving apparatus of the present invention is applied to a television apparatus equipped with a digital tuner.
The television apparatus 1 ′ illustrated in FIG. 2 has the same function as the television apparatus 1 illustrated in FIG. That is, the television apparatus 1 ′ has an MCU 22 with a built-in remote control decoding process that combines the functions of the remote control signal processing IC 12 and the MCU 13 provided in the television apparatus 1 (FIG. 1). Therefore, the television apparatus 1 ′ shown in FIG. 2 can realize the same function as the television apparatus 1 described above, and thus the repeated description thereof is omitted here. In the configuration shown in FIG. 2, the decoding means and determination means of the present invention are realized by the MCU 22 with a built-in remote control decoding process.

  FIG. 3 is a diagram illustrating an example of a remote control signal transmitted from the remote control device. The remote control signal includes a header part, a data part following the header part, and a code end part (trailer part) indicating the end of the data part. The data portion is, for example, a bit string of data corresponding to an operation button of the remote control device 2 expressed by a combination of a LOW duration and a HIGH duration of the remote control signal.

  In the remote control signal receiving apparatus according to the present invention, a remote control signal having adjustment-dedicated code information is transmitted from the remote control apparatus to the remote control signal receiving apparatus (hereinafter simply referred to as a receiving apparatus), so that the decoding condition based on the remote control signal is satisfied. Correction processing (decoding criterion correction processing) is automatically executed on the receiving device side. Thereby, even if the state of the remote control signal varies depending on the usage environment of the remote control device, for example, the decoding conditions can be corrected according to the state, and the operability of the remote control device can be greatly improved.

  The adjustment dedicated code is prepared in advance, and when the user performs an operation such as pressing a predetermined button of the remote control device, a remote control signal having code information dedicated to the adjustment is transmitted from the remote control device. In this case, by continuously pressing the button, the remote control signal dedicated to the adjustment is continuously transmitted repeatedly. In addition, the remote control signal may be transmitted continuously and repeatedly for a predetermined time with a single operation of pressing the button without having to keep pressing the button.

  In addition, when a remote control signal dedicated for adjustment is transmitted from the remote control device, not only the configuration in which the remote controller signal dedicated for adjustment is continuously transmitted repeatedly by the user pressing and holding a predetermined button, the user can perform other purposes. When an operation (for example, a channel change operation) is performed, a remote control signal dedicated for adjustment may be transmitted accordingly. In this case, for example, a remote control signal dedicated for adjustment may be transmitted following a code signal for channel change operation. At this time, the remote control signal for adjustment can be continuously and repeatedly transmitted for a predetermined time. In such a configuration, the user does not need to be aware of the adjustment mode and does not need to perform a special operation for sensitivity adjustment, and can automatically adjust the sensitivity in the receiving apparatus.

  On the receiving device side, the remote control signal dedicated for adjustment transmitted from the remote control device is received, and the mode shifts to the adjustment mode. In this case, the receiving apparatus needs to decode the remote control signal dedicated for adjustment and recognize that the remote control signal is a remote control signal dedicated for adjustment. When the remote control signal dedicated for adjustment is recognized, the receiving apparatus shifts to the adjustment mode. In the adjustment mode, it is determined whether the data decoded from the remote control signal to be received matches the code data held on the receiver side, and the remote control signal for adjustment sent from the remote control device is correctly decoded. Can be determined.

At this time, if the reception state from the remote control device is poor and the receiver cannot recognize that the remote control signal is exclusively used for adjustment, the adjustment mode cannot be entered. In this case, for example, a user who has a remote control device approaches the reception device so as to improve the reception state, transmits a remote control signal dedicated for adjustment, moves the reception device to the adjustment mode, and then moves to a position for normal use. Perform actions such as
Further, it may be configured such that the mode can be shifted to the adjustment mode by performing a predetermined operation with a key switch or a button of the receiving apparatus main body.

  Next, an example of sensitivity adjustment processing in a receiving apparatus that has received a remote control signal dedicated for adjustment will be described. In the receiving device, when receiving the adjustment-specific remote control signal transmitted from the remote control device in the adjustment mode, it is determined whether the remote control signal is correctly decoded, and the remote control signal is decoded according to the determination result. Change the decoding conditions.

Here, when decoding the received remote control signal from the pulse state into code data, a criterion for determining that the pulse waveform signal is normal is determined in advance, and the criterion is changed.
When decoding an adjustment-dedicated remote control signal, a pulse waveform signal that matches this criterion is decoded, and it is determined whether or not the decoded value is a correct decoded value. If decoding of this criterion is not successful, the range of the criterion is gradually expanded to expand the range considered normal. As a result, even when the pulse of the remote control signal is disturbed more than usual, the determination criterion is expanded to the extent that it can be correctly decoded, and the decoding process can be performed with the optimum criterion according to the waveform of the remote control signal. . The decoding criterion range relating to the present invention is set for each of the pulse (bit) width, the number of pulses (bits), and the code end period. More specific description will be given below.

First, it is assumed that a signal as shown in FIG. 3 is transmitted as a remote control signal dedicated for adjustment.
At this time, as a specified value of logic 0/1, in the case of a pulse (bit) width, it is assumed that logic 0 is 2 ms and logic 1 is 3 ms. Further, in the case of the number of pulses (bits), the specified value is assumed to be 10. Further, in the case of the code end period, the specified value is 10 ms. That is, when the remote control signal received by the receiving device matches the above specified value, the remote control signal is decoded. At this time, regarding the pulse width, when the pulse width of each pulse coincides with either 2 ms or 3 ms, a value 0 or 1 corresponding to either of them is set as code data for each pulse.

In the receiving apparatus, when decoding the remote control signal received based on the specified value as described above, predetermined determination criteria are provided for each of the pulse width, the number of pulses, and the code end period, and these pulses are included in the determination criteria. When there is a width, number of pulses, and code end period, decoding is performed assuming that the values match the specified values.
In the process according to the present invention, the decoding is performed within the initially set determination criterion, and when the decoding is correctly performed a predetermined number of times, the determination criterion is maintained.

  Since the remote control signal dedicated for adjustment is continuously transmitted, each remote control signal (a series of pulse signals) is successively decoded and the number of successful decoding is counted. Since the receiving device stores the decoding result of the remote control signal, it can be determined whether or not the decoding result of the remote control signal is correct.

  If the decoding has not succeeded more than the specified number of times within the initially set criterion, the criterion is changed. That is, the determination criteria for the pulse width, the number of pulses, and the code end period are sequentially increased. In other words, even if there is some disturbance in the pulse waveform, it is assumed that it matches the specified value.

  The change of the determination criterion can be performed a plurality of times stepwise until the decoding succeeds for a predetermined number of times. Then, a criterion for determining that the decoding has succeeded for a predetermined number of times is set in the receiving apparatus, and the subsequent remote control signal decoding process is performed.

  In the above example, for example, the pulse width is determined on the assumption that the logic 0 is 1.9 to 2.1 ms and the logic 1 is 2.9 to 3.1 ms as an initial determination criterion regarding the pulse width. The maximum allowable value of the criterion range for determining the pulse width is assumed that logic 0 is 1.6 to 2.4 mm and logic 1 is 2.6 to 3.4 mm.

  At this time, if the decoding succeeds a predetermined number of times using the initial criterion for the pulse width, the initial criterion is maintained. If the decoding has not succeeded for the specified number of times, the logic 0 is expanded to 1.8 to 2.2 ms and the logic 1 is expanded to 2.8 to 3.2 ms as the pulse width criterion.

Then, the decoding is performed again with a new criterion, and if the decoding succeeds for a specified number of times, the criterion is set. If the decoding has not succeeded for the specified number of times, the logic 0 is expanded to 1.7 to 2.3 ms and the logic 1 is expanded to 2.7 to 3.3 ms as judgment criteria.
Then, decoding is performed based on a new determination criterion, and if the decoding succeeds a prescribed number of times, the determination criterion is set. If the decoding has not succeeded for a specified number of times, the logic 0 is expanded to 1.6 to 2.4 ms and the logic 1 is expanded to 2.6 to 3.4 ms as judgment criteria. This criterion is a predetermined maximum allowable value.

  Further, decoding is performed based on a new criterion, and if the decoding succeeds for a specified number of times, the criterion is set. If the decoding has not succeeded for the specified number of times, this time, it is set as a criterion for which the number of successful decoding has been large. If the decoding has never succeeded, the initial criterion, that is, the logic 0 is set to 1.9 to 2.1 ms, and the logic 1 is set to 2.9 to 3.1 ms. In this case, the correction of the pulse width is NG. When the pulse width correction is NG, the process proceeds to the next pulse (bit) number correction.

As an initial criterion for the number of pulses, the number of bits included in one remote control signal is determined as 10. The maximum allowable range of the number of pulses is 8 to 12.
If the decoding succeeds a prescribed number of times using the initial criterion, the criterion regarding the number of pulses is set to 10 times. If the decoding is not successful for the specified number of times, the judgment criterion for the number of pulses is 9 to 11.

Then, the decoding is performed again with a new criterion, and if the decoding succeeds for a specified number of times, the criterion is set. If the decoding is not successful for a specified number of times, the pulse number criterion is expanded to 8-12.
Then, decoding is performed based on a new determination criterion, and if the decoding succeeds a prescribed number of times, the determination criterion is set. If the decoding has not succeeded for the specified number of times, this time, it is set as a criterion for which the number of successful decoding has been large. If the decoding has never succeeded, 10 is set as the initial criterion. In this case, the correction of the number of pulses is NG. When the pulse width correction is NG, the process proceeds to the next code end period correction.

  The initial criterion for the code end period is determined to be 9 ms or more. The maximum allowable range of the code end period is 6 ms or more. First, if decoding succeeds a prescribed number of times with the initial criterion, the criterion for the code end period is set to 9 ms or more. If the decoding is not successful for a specified number of times, the determination criterion for the code end period is 8 ms or more.

Then, the decoding is performed again with a new criterion, and if the decoding succeeds for a specified number of times, the criterion is set. In addition, if the decoding is not successful for a specified number of times, the determination criterion for the code end period is expanded to 7 ms or more.
Then, decoding is performed based on a new determination criterion, and if the decoding succeeds a prescribed number of times, the determination criterion is set. If the decoding is not successful for a specified number of times, the criterion for determining the code end period is further expanded to 6 ms or more.

  Then, decoding is performed based on a new determination criterion, and if the decoding succeeds a prescribed number of times, the determination criterion is set. If the decoding has not succeeded for the specified number of times, this time, it is set as a criterion for which the number of successful decoding has been large. If the decoding has never succeeded, the initial determination criterion is set to 9 ms or more.

  By the above processing, if the decoding of each criterion is not successful, the criterion is expanded to a range that can be correctly decoded by expanding the range that is considered normal by gradually expanding the criterion, and the remote control signal waveform is expanded. The decoding process can be performed with the optimum standard according to the standard.

  In the above example, if the number of successful decodes is less than the specified number of times in a specific condition among the pulse width, the number of pulses, and the code end period, the process proceeds to the determination of the next condition. Sequential decoding determination may be performed with respect to the above condition, and the specified number of times when decoding determination under the next condition is performed at this time may be greater than the specified number of decoding determinations according to the previous condition.

FIG. 4 is a flowchart for explaining an example of processing in the remote control signal receiving apparatus according to the present invention.
First, when a remote control signal dedicated for adjustment is transmitted from the remote control device, the receiving device shifts to an adjustment mode and starts decoding the remote control signal (step S1). In this case, the remote control signal dedicated for adjustment is continuously and repeatedly transmitted from the remote control device. Here, it is determined whether or not the remote control signal has been decoded a predetermined number of times (step S2). When the number of successful decoding times reaches the specified number, it can be determined that decoding is successful in that state.

  If the decoding is not OK for a predetermined number of times in step S2, the number of times of successful decoding is stored (step S3). Then, it is determined whether or not the correction of the entire range of the remote control signal has been completed (step S4). The correction of the entire range refers to correction of the entire range from the initial value of the determination criterion for performing decoding determination to the maximum allowable value for any item of the pulse width, the number of pulses, and the code end period of the remote control signal. Further, the term “correction” here means correcting a criterion for determining a remote control signal.

  If the correction of the entire range has not been completed, a correction process for expanding the criterion is performed (step S10), and the process returns to step S1. If the correction of the entire range has been completed in step S4, it is further determined whether or not the number of times the decoding was OK is 0 (step S5). If it is 0, that is, if the decoding has not been successful even though the decoding has been performed with the determination criteria of the entire range, the determination criterion of the item is set to the initial value (step S11). If the number of times the decoding was OK is not 0, a criterion for determining the maximum number of times is set (step S6).

In step S2, if the decoding is OK for a predetermined number of times, the maximum OK determination criterion, that is, the determination criterion at that time is set (step S6).
If determination criteria are set in step S6, it is next determined whether or not correction has been completed for all types of items (step S7). All types of items are the above-described pulse width, number of pulses, and end code period, and it is determined whether or not the correction of the determination criteria has been completed for all of these items.

  If correction of all types of items has been completed, it is further determined whether correction of all types of items is not NG (step S8). That is, it is determined whether decoding is not NG for all types of items. If the correction of all types of items is not NG, it is displayed that the decoding correction is OK (step S9).

If the correction of all types of items is NG, a display indicating that the decoding correction is NG is performed (step S13). As a display method, for example, it can be displayed on the display 15 by OSD in the configuration of FIGS. 1 and 2, or can be displayed by lighting or blinking the LED using the LED circuit 16.
If all types of correction have not been completed in step S7, the correction is set for the next type of item (step S12), and the process returns to step S1.

  In this case, if correction is completed for the first item and correct decoding can be performed a specified number of times, decoding may be performed under the decoding conditions at that time without shifting to correction for the next item. Further, when all items are corrected, it is possible to set the specified number of times when performing the decoding determination under the following conditions as described above to be larger than the predetermined number of times of decoding determination under the previous conditions.

FIG. 5 is a flowchart for explaining an example of a decoding determination criterion correction process.
First, the type of correction of the criterion is determined. If the determination criterion correction type is the number of pulses, the determination criterion for the number of pulses is corrected (step S22). The determination criterion correction process is executed according to the flow shown in FIG.
If the determination criterion for the number of pulses is within the allowable range as a result of the correction processing (step S23—YES), the correction processing for the determination criterion for the number of pulses is terminated. If the determination criterion for the number of pulses is not within the allowable range, the correction of the entire range (the range from the initial value to the maximum allowable value) is completed and the determination criterion is set (step S24).
If the type of correction of the determination criterion is a pulse width, the determination criterion of the pulse width is corrected (step S25). If the determination criterion for the pulse width is within the allowable range (step S26-YES), the correction processing for the determination criterion for the pulse width is terminated. If the determination criterion for the pulse width is not within the allowable range, the correction of the entire range is completed and the determination criterion is set (step S24).

  Similarly, if the type of correction of the determination criterion is the code end period, the determination criterion of the code end period is corrected (step S27). If the determination criterion for the code end period is within the allowable range (step S28—YES), the correction processing for the determination criterion for the code end period is terminated. If the determination criterion of the code end period is not within the allowable range, the correction of the entire range is completed and the determination criterion is set (step S24).

  Note that the above-described correction process of the remote control signal decoding condition can be automatically performed by the remote control signal receiving apparatus that has received the adjustment-specific remote control signal. In addition, the above-described process can be manually performed. Also good. In this case, for example, the adjustment mode can be selected from the menu on the display screen. In the adjustment mode, the number of successful decodes is displayed for each adjustment condition item, and the decoding criterion can be manually adjusted according to the result. As a result, the same operation as the automatic adjustment described above can be executed manually.

It is a block diagram which shows the structural example of the remote control signal receiver by this invention. It is a block diagram which shows the other structural example of the remote control signal receiver by this invention. It is a figure which shows an example of the remote control signal transmitted from a remote control device. It is a flowchart for demonstrating an example of the process in the remote control signal receiver by this invention. It is a flowchart for demonstrating the example of a correction process of the decoding criterion.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Television apparatus, 2 ... Remote control apparatus, 11 ... Light-receiving part, 12 ... Remote control signal processing IC, 13 ... MCU, 14 ... Display device driver, 15 ... Display, 16 ... LED circuit, 17 ... Tuner, 18 ... External input part 19 ... Video processing IC, 20 ... Audio processing IC, 21 ... Speaker, 22 ... MCU with built-in remote control decoding process.

Claims (9)

In a remote control signal receiving device that decodes a remote control signal transmitted from a remote control device, a decoding process for applying a predetermined determination reference value to the received remote control signal and generating code data from a pulse waveform that matches the determination reference Decoding means to perform;
Determining means for determining whether or not the decoding of the remote control signal by the decoding means has succeeded,
The remote control signal receiving apparatus according to claim 1, wherein the decoding means changes a range of the determination reference value when the remote control signal is not successfully decoded.   2. The remote control signal receiving device according to claim 1, wherein the remote control signal receiving device automatically shifts to a predetermined adjustment mode according to a predetermined adjustment-dedicated remote control signal transmitted from the remote control device, and the determination means includes: In the adjustment mode, it is determined whether or not the adjustment-dedicated remote control signal has been successfully decoded. The remote control signal receiving device according to claim 1 or 2, wherein the decoding means continuously and repeatedly decodes the remote control signal,
The remote control signal receiving apparatus according to claim 1, wherein the determination means determines that the remote control signal has been successfully decoded when the decoding has succeeded more than a predetermined number of times. The remote control signal receiver according to any one of claims 1 to 3,
When it is determined by the determination means that the decoding based on the initial value of the determination reference value has not been successful,
The decoding means performs the decoding again by expanding the range of the determination reference value, sets the determination reference value when the decoding is successful as the determination reference value used for decoding, and receives the remote control signal. apparatus. In the remote control signal receiver according to claim 4,
The determination reference value has a predetermined maximum allowable range, and the decoding means expands the range of the determination reference value step by step from the initial value when decoding by the initial value is not successful.
A remote control signal receiving apparatus, wherein if the decoding is not successful even if the range is expanded to the maximum allowable value, decoding is performed with the determination reference value set to an initial value. In the remote control signal receiver according to any one of claims 1 to 5,
The determination reference value is set for each item of the pulse width of the remote control signal, the number of pulses, and the code end period,
The remote control signal receiving apparatus according to claim 1, wherein the decoding means decodes a pulse waveform corresponding to each of the determination reference values. In the remote control signal receiver according to claim 6,
If the remote control signal is not successfully decoded at the initial value of the determination reference value, the decoding means changes the range of the determination reference value for any of the items for which the determination reference value is set. A remote control signal receiving apparatus characterized in that, when decoding is not successful even if the range of the determination reference value is changed, the determination reference value of another item is changed. In the remote control signal receiver according to claim 6,
The decoding means changes a range of the determination reference value for any item among the items for which the determination reference value is set, and the determination reference value for the item for which the range of the determination reference value is changed is set. A remote control signal receiver characterized in that after completion, the criterion value of another item is changed.   9. A remote control signal receiving apparatus according to claim 1, and a predetermined video display process according to code data decoded by the remote control signal receiving apparatus.

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