JP4785147B2 - Remote control signal receiving apparatus and image display apparatus provided with the apparatus - Google Patents

Description

  The present invention relates to a remote control signal receiving apparatus and an image display apparatus including the apparatus, and more specifically, receives a remote control code signal transmitted from a remote control, shapes a waveform, and decodes the remote control signal receiving apparatus. And an image display device provided with the remote control signal receiving device.

  In an image display device such as a liquid crystal television, generally, a remote controller (remote controller) can be used to operate the image display device. Therefore, in the image display device, a light receiving unit that receives a remote control code signal from an attached remote controller, and a CPU (Central Processing Unit) that decodes the remote control code signal received by the light receiving unit, analyzes the code, and executes a command. ) And the like.

  In many cases, the user who operates the remote controller operates the remote controller with the light transmitter of the remote controller facing the center of the display screen. In recent years, display screens have become larger in image display devices, and accordingly, when a user operates a remote control, it is difficult for a remote control code signal to reach the remote control light receiving unit provided outside the display screen. The operability of the remote control will be poor.

  In order to solve such problems, a configuration in which a plurality of remote control light receiving units are provided in accordance with an increase in the size of the display screen has been adopted. A configuration is adopted in which lines are connected by OR and processed by one decoder.

  Regarding a configuration in which a plurality of remote control light receiving units are provided, for example, Patent Document 1 discloses that a remote control code signal is extracted without being affected by noise even when the light receiving unit affected by external noise is installed in the vicinity of the noise source. A remote control signal receiver for the purpose is disclosed. In this remote control signal receiving device, a remote control code signal from the remote control is received by any of the plurality of remote control light receiving units, and each received signal is decoded by a separate decoder. At this time, the decoder extracts an address code included in the received signal received by the remote control light receiving unit. Based on this address code, a valid / invalid signal indicating whether the decode signal is valid or invalid is generated. Then, the decoder selection unit adopts the decoder signal of the corresponding decoder if the validity / invalidity signal indicates validity.

  On the other hand, when the image display device becomes larger, the screen is divided and shared by a plurality of users (viewers) at the same time, or the plurality of users are used for different video settings for each individual. Is required. In response to this request, a plurality of remote controllers are prepared for one image display device, but it is not good that each remote controller operation affects other remote controller operations.

Patent Document 2 discloses a multi-screen display device that shares a screen with a plurality of remote controllers using a device in which a prescribed ID (IDentification) is set on the remote controller side. With this technology, a plurality of users individually operate one image display device without affecting each other remote control operation, that is, each ID screen (window) corresponding to each remote control is operated. It is possible to do.
JP 2001-177879 A JP 2000-270238 A

  However, in the remote control signal receiving apparatus, when a method of identifying a plurality of remote controls by ID as in the technique described in Patent Document 2, the transmission source by the ID is received only after the remote control code signal from each remote control is received and decoded. Can be identified.

  Therefore, when a plurality of remote controllers are operated and remote control code signals with IDs are simultaneously input to a plurality of light receiving units from the respective remote controllers, the signals are interrupted by the operations of the plurality of remote controllers alternately, and can be analyzed by the CPU. The problem that it disappears or the operation | movement which a user does not intend arises.

  Such a problem occurs in the same manner even when a plurality of light receiving units are provided in the remote control signal receiving device unless a light receiving unit is provided exclusively for each remote control. In order to prevent the remote control code signal from reaching the large screen as described above, it is necessary to provide a plurality of light receiving units for each remote controller, which increases the size and cost of the apparatus.

  Further, such a problem occurs even if the remote control code signal is not an ID-added device but can be simply operated by a plurality of remote controls.

  Thus, in the remote control signal receiving device, when a plurality of remote controls are operated and a plurality of remote control code signals are received simultaneously by a plurality of light receiving units, the signals are interrupted and cannot be analyzed by the CPU, or the user intends The operation that does not. Furthermore, as shown in the above-mentioned Patent Document 1, even if the success rate of decoding is increased by adopting a configuration in which signals that have entered a plurality of light receiving units are separately decoded and selected, this Such a problem is inevitable.

  The present invention has been made in view of the above circumstances, and in a configuration including a plurality of receiving units for receiving a remote control code signal transmitted from a remote controller, a dedicated receiving unit is not provided for each remote controller. Even when remote control code signals from a plurality of remote controllers are received simultaneously by a plurality of receivers, operations by a plurality of remote controllers are alternately adopted to prevent an operation unintended by the user from being performed. An object of the present invention is to provide a remote control signal receiving device that can be used and an image display device including the device.

  In order to solve the above-described problems, a first technical means of the present invention includes a plurality of receiving units that receive a remote control code signal transmitted from a remote controller, and one each connected to each of the plurality of receiving units. A plurality of code waveform shaping units that perform waveform shaping of the remote control code signal received by the reception unit, and a code waveform shaping unit that outputs a remote control code signal to be used for decoding from the plurality of code waveform shaping units A remote controller signal receiving device comprising: a remote controller signal receiving device that selects and outputs a remote controller code signal from the selected receiver waveform waveform shaping unit, wherein each receiver unit receives a code waveform shaping unit; It is determined whether or not waveform shaping of the remote control code signal is successful, and the code waveform shaping unit selection unit determines whether or not the remote control code to be used for the decoding is based on the result of the determination. A shaping unit selecting unit that selects the code waveform shaping unit that has output a signal, and an output limiting unit that prohibits output of a remote control code signal input from a code waveform shaping unit other than the selected code waveform shaping unit for a predetermined period. It is characterized by having.

  According to a second technical means, in the first technical means, the code waveform shaping unit selection unit resets the measurement of the predetermined period each time a remote control code signal is output.

  According to a third technical means, in the first or second technical means, the predetermined period is a period determined based on an interval at which the same remote control code signal is continuously issued from the remote controller or a continuous period thereof. It is characterized by.

  A fourth technical means includes a decoding processing unit for decoding the remote control code signal output from the code waveform shaping unit selection unit in the second technical means, and the predetermined period is an output processing period to the decoding processing unit. The period is determined based on the above.

  According to a fifth technical means, in any one of the first to fourth technical means, each of the code waveform shaping units is a remote control code signal for the code waveform shaping unit selection unit only when the result of the determination indicates success. Is output.

  A sixth technical means includes a decoding processing unit for decoding the remote control code signal output from the code waveform shaping unit selection unit in any one of the first to fifth technical means, the code waveform shaping unit, the code The waveform shaping unit selection unit and the decode processing unit include a first control calculation unit including the code waveform shaping unit and the code waveform shaping unit selection unit, and a second control calculation unit including the decode processing unit, The first control calculation unit and the second control calculation unit can be individually operated in a low power consumption mode, and the first and second control calculation units are When the first control calculation unit receives a remote control code signal from the reception unit when operating in the power consumption mode, the first control calculation unit returns from the low power consumption mode to the normal operation mode. When In addition, waveform shaping of the remote control code signal is started, and the second control computing unit is returned from the low power consumption mode to the normal operation mode in response to the waveform shaping result. Therefore, a pulse signal for transmitting is transmitted.

  According to a seventh technical means, in the sixth technical means, the first control arithmetic unit receives the remote control code signal from the receiving unit repeatedly and continuously in the low power consumption mode. When it is determined that the first remote control code signal by the shaping unit has been correctly shaped to the predetermined level, the pulse signal is transmitted at the end of the waveform shaping of the first remote code signal, and the second The control calculation unit is configured to start returning from the low power consumption mode to the normal operation mode by receiving the pulse signal.

  The eighth technical means is an image display device comprising the remote control signal receiving device according to any one of the first to seventh technical means.

  According to the present invention, in a remote control signal receiving device including a plurality of receiving units that receive remote control code signals transmitted from a remote controller, a remote control code signal from a plurality of remote controllers is provided without providing a dedicated receiving unit for each remote control. Even when a plurality of reception units are simultaneously received, operations by a plurality of remote controllers are alternately adopted, and it is possible to prevent an operation not intended by the user from being performed.

  A remote control signal receiving apparatus according to the present invention described below includes a plurality of receiving units, and is incorporated in various electronic devices that can be operated using a remote controller, to operate the electronic device. This remote control signal receiving device is particularly useful for an electronic device in which a plurality of remote control receiving units are arranged over a wide range.

  As such an electronic device, for example, an image display device can be applied as described in each embodiment below. In this image display device, remote control code signals from a plurality of attached remote controls are received by a plurality of receiving units, and a predetermined operation is executed according to a result of decoding the remote control code signals. When the remote control signal receiving device according to the present invention is incorporated into an image display device, the larger the display screen is, the more useful it is.

  As the image display device according to the present invention, a television device such as a liquid crystal television, a display such as a PC monitor that displays data by connecting to a personal computer (PC), and the like can be applied. Also, the image display method is not limited to the liquid crystal display method, and various devices such as a PDP (Plasma Display Panel), an organic EL (Electro Luminescence), and an LED (Light Emitting Diode) display device can be applied.

  Further, a light receiving unit that receives (receives) infrared light transmitted from the remote control side will be described as an example of the receiving unit. For example, in Japan, communication using infrared light may employ a format of the Japan Electric Appliances Association or a manufacturer-specific infrared communication method. For communication between the transmitter on the remote control side and the plurality of receivers on the remote control signal receiving apparatus side, wireless communication such as Bluetooth (registered trademark), UWB (Ultra Wide Band), Zigbee, etc., in addition to the infrared communication method. Other wireless communication methods such as PAN (Personal Area Network) may be adopted. Further, in each of the following embodiments, a configuration example in which the number of light receiving units is four is shown, but the present invention can be applied to a configuration including a plurality of light receiving units without being limited to four.

(Embodiment 1)
FIG. 1 is a block diagram for explaining an embodiment of a remote control signal receiving apparatus according to the present invention. 1 includes a plurality of light receiving units (in this example, first to fourth light receiving units 11a to 11d) for (receiving) a remote control code signal by infrared light. Yes. Thereby, it can respond to the image display apparatus provided with the display screen of a large size.

  Each of the light receiving units 11a to 11d is connected to first to fourth code waveform shaping units 12a to 12d for shaping the waveform of the received remote control code signal. Each of the code waveform shaping units 12a to 12d determines the remote control code signal input from the light receiving units 11a to 11d for each bit, for example, and shapes the remote control code signal to a standard center value. As a result of the shaping, the remote control code signals sd1 to sd4 that have been shaped are output from the code waveform shaping sections 12a to 12d.

  Each code waveform shaping unit 12a to 12d determines whether or not the above-described waveform shaping is successful, and the determination result is output. Here, the pulse width and the number of bits (number of pulses) of the pulse signal obtained by waveform shaping, or the start bit width or the like depending on the code may be checked to determine whether the waveform shaping has succeeded or failed. The determination result is generated and output as, for example, code output determination signals se1 to se4.

  Although the above determination may be performed simply, as will be described next, noise is generated in all the light receiving units 11a to 11d by performing the waveform shaping result of the remote control code signal such as the previous time or the previous time as described below. Even when it enters, it is possible to prevent the remote control code signal that is finally decoded from being interrupted.

  Actually, when the user operates any remote control key, the remote control code signal is transmitted from the remote control. If the pressing operation of the remote control key is continued at this time, the same remote control code signal is repeatedly transmitted. When the power key is operated to turn on the power, the same remote control code signal is transmitted at least a plurality of times when the power key is pressed. The transmission interval of the remote control code signal transmitted continuously is set to a predetermined value such as 135 ms or 65 ms, for example. In the case of the standard transmitted at 135 ms, for example, when the signal is interrupted for a predetermined time of about 160 ms to 180 ms, it is determined that the remote control code signal is interrupted. That is, if even one remote control code signal transmitted continuously at a predetermined interval cannot be decoded, it is usually determined that the remote control signal is interrupted here.

  In order to prevent such discontinuity of the remote control code signal, for example, when it is determined that the waveform shaping has failed due to the determination as described above, among the remote control code signals continuously received by the light receiving unit, It is further determined whether or not the previous remote control code signal waveform shaping was successful. If the waveform shaping is successful by this determination, the number of bits of the current remote control code signal is further determined. If the number of bits is within a predetermined range, a code output determination signal indicating that the waveform shaping is successful is generated, and the code output determination signal is sent to the code waveform shaping unit selection unit 13 together with the previous remote control code signal. Output.

  Here, when the previous remote control code signal is output when the waveform shaping determination result fails, the number of times (the number of times that can be output continuously) is limited, thereby increasing safety. Can be maintained. Actually, for example, when another remote control code signal B is continuously received without a key-off period while the remote control code signal A is being received, and the remote control code signal B is not correctly shaped, the remote control code signal A Will continue to be output, and there is a risk that operations unintended by the user will be executed. However, such a problem can be avoided by setting the above-mentioned number of limits (for example, limited to two consecutive times).

  On the other hand, if waveform shaping of the previous remote control code has failed, and if the number of bits is not within the predetermined condition range, a code output determination signal indicating failure has been generated, and the code waveform shaping is performed. The data may be output to the part selection unit 13.

  In this way, the remote control code signals sd1 to sd4 and the code output determination signals se1 to se4 output from the code waveform shaping units 12a to 12d are input to the code waveform shaping unit selection unit 13. When the number of light receiving units is n, the remote control code signal sd (n) and the code output determination signal se (n) are output from each code waveform shaping unit. Note that necessary data such as the previous remote control code signal and waveform shaping result may be stored in a memory, and each of the code waveform shaping units 12a to 12d performs the above determination using the code waveform shaping unit selection unit 13. May be.

  The code waveform shaping unit selection unit 13 selects a code waveform shaping unit that outputs a remote control code signal to be used for decoding from these code waveform shaping units 12a to 12d based on the determination result, and selects the selected code. A shaping unit selecting means (hereinafter referred to as selecting means) 131 is provided for outputting a remote control code signal from the waveform shaping section to a CPU section 14 to be described later. In this example, the selection is performed based on the code output determination signals se1 to se4.

  With the above configuration, even if some of the plurality of light receiving units 11a to 11d have noise, waveform shaping can be performed correctly if even one light receiving unit does not have noise, and the decoding success rate. Can be increased. Further, by adopting the previous remote control code signal, it is possible to prevent the remote control code signal from being interrupted even when noise enters all the light receiving portions 11a to 11d.

  Each of the code waveform shaping units 12a to 12d is preferably configured to output a remote control code signal to the code waveform shaping unit selection unit 13 only when the determination result indicates success.

  As a main feature of the present invention, the code waveform shaping unit selection unit 13 is an output restriction that prohibits output of a remote control code signal input from a code waveform shaping unit other than the code waveform shaping unit selected by the selection unit 131 for a predetermined period. It is assumed to have means 132. The output limiting unit 132 will be described later in detail.

  In addition, the remote control signal receiving apparatus includes a decoding processing unit that is an output destination of the remote control code signal selected by the selection unit 131. The decode processing unit is exemplified by the CPU unit 14. The CPU unit 14 executes processing for decoding the remote control code signal output from the code waveform shaping unit selection unit 13, processing for analyzing the decoding result, and processing according to the analyzed code. The CPU section 14 that executes these processes is configured to issue a process command in accordance with the code to a control section in the subsequent stage provided in the image display apparatus in which the remote control signal receiving apparatus of the present embodiment is incorporated. As described above, the decoding processing unit exemplified by the CPU unit 14 only needs to be able to execute at least processing up to the stage of outputting the decoding result, and may be configured to execute processing up to the stage of outputting the analysis result. Good.

  FIG. 2 is a diagram showing a configuration example of the code waveform shaping unit selection unit in the remote control signal receiving apparatus of FIG. 1 as a logic circuit, and FIG. 3 shows in detail the output limiting process in the code waveform shaping unit selection unit of FIG. It is a timing chart for explaining. Although illustrated as a logic circuit in FIG. 2, the same processing may be executed by software.

  The code waveform shaping unit selection unit 13 illustrated in FIG. 2 inputs an AND element 13a that inputs the output sd (n) and se (n) to each code waveform shaping unit 12a to 12d, and an output from the AND element. And an AND element 13b that receives a negative of an output prohibition signal sde (n) described later. Further, the code waveform shaping unit selection unit 13 includes an OR element 13c that receives four output signals sdo (n) from the four AND elements 13b, and outputs from the OR element 13c are input to the CPU unit 14. It is comprised so that.

  sde (n) is an output inhibition signal for inhibiting output of a remote control code signal input from a code waveform shaping unit other than the code waveform shaping unit selected by the selection unit 131. The code waveform shaping unit selection unit 13 includes a timer buffer (TimerBuffer) 13d, and the output inhibition signal sde (n) is output to the AND element 13b by the timer buffer 13d for a predetermined period. That is, the code waveform shaping unit selection unit 13 is configured by the timer buffer 13d so that the period during which the output inhibition signal is output is limited to a predetermined period.

  Here, se (n) is set to an initial value “0”, “1” when OK, and “0” when NG, so that the AND element 13a can obtain sd (n) when se (n) is “1”. ) Code can be output. Further, sde (n) is set to an initial value 0, and is set to “1” when sdo (other than n) is input, and is set to “0” when the timer buffer 13d times out, so that sde (n) becomes “1”. ", The signal from the AND element 13a input to the AND element 13b can be cut off. The timer buffer 13d that performs such input / output is an example of the output limiting unit 132 described above.

  Referring to FIG. 3, taking as an example a case where the first light receiving unit 11a normally receives the remote control code signal and a little later, the second light receiving unit 11b normally receives the remote control code signal. The output restriction process in the waveform shaping unit selection unit 13 will be described in detail.

  First, the remote control signal received by the first light receiving unit 11a is normally waveform-shaped, and the remote control code signal sd1 and the code output determination signal se1 from the first code waveform shaping unit 12a are input to the first code waveform shaping unit 12a. The output of the AND element 13a is a remote control code signal sd1. At this time, none of sdo1 to sdo4 is output, and sde (n) such as sde1 output from the timer buffer 13d remains “0” because it corresponds to the initial value or after time-out. Accordingly, the output signal sdo1 output from the AND element 13b to the first code waveform shaping unit 12a remains the output of the AND element 13a, that is, the remote control code signal sd1 (signal 20).

  Thereafter, the remote control code signal sd2 (signal 30) from the second code waveform shaping unit 12b is input to the corresponding AND element 13a, and is input to the corresponding AND element 13b as it is because it is normal. However, since the timer buffer 13d outputs “1” until sdo2 to sdo4 time out due to the output of sdo1, the output of the AND element 13b to the second code waveform shaping unit 12b is “0” which is the negative of sdo2. ”And sdo2 becomes“ 0 ”. In this way, when sde1 enters slightly ahead of sde2, sde2 is blocked.

  The output is also prohibited when the third and fourth light receiving parts 11c and 11d receive a normal remote control code signal after the first light receiving part 11a. That is, when the signal of the light receiving unit n is once output to the CPU unit 14, the signal sde (n) for prohibiting the output of the other light receiving units is output using sdo (n) as a trigger.

  Such prohibition signal output processing is executed until a timeout occurs, and during that time, a normal remote control code signal sd1 from the first code waveform shaping unit 12a is output to the OR element 13c as signals 21 and 22, and the CPU unit 14 Will be output.

  The timer buffer 13d is preferably configured to update the count every time a signal is input, that is, every time sdo (n) becomes “1”. In this way, the measurement of the predetermined period is reset each time the code waveform shaping unit selection unit 13 outputs the remote control code signal, so that the CPU unit 14 does not sandwich a series of signals from other light receiving units. Can be output.

  Although it depends on the value of the predetermined period and the signal transmission interval, after one or more times out, the timing at which the remote control code signal sd2 is processed faster than the remote control code signal sd1 occurs, or only the remote control code signal sd2 is received. Therefore, the remote control code signal sd2 can be output to the CPU unit 14.

  Thus, in this embodiment, even when remote control code signals from a plurality of remote controllers are simultaneously received by a plurality of light receiving units, the time limit is set by the timer until the light receiving unit that has started output next outputs a code. Because it is limited to ones that can output light receiving units (for example, those that have started output), signals from multiple remote controllers are used alternately to prevent the operation from being interrupted at unnecessary timing. can do. As a result, it is possible to prevent an operation unintended by the user from being performed. In addition, even when an ID is included in the remote control code signal, the remote controller can be identified because it can be analyzed by the CPU unit 14. In this configuration, it is not necessary to provide a dedicated light receiving unit for each remote controller.

  Further, the processing in the present embodiment can be applied even if the remote control code signal transmitted from the remote controller is output in a plurality of cycles with the front and back as one set. At this time, the code waveform shaping unit selection unit 13 or each of the code waveform shaping units 12a to 12d, or in cooperation with each other, the front and back of the remote control code signal in which the front and back transmitted from the remote control are set coincide with each other. It is good to determine whether or not

(Embodiment 2)
FIG. 4 is a timing chart for explaining an example of the output restriction process in the code waveform shaping unit selection unit of FIG. 2, and is a diagram for explaining another embodiment of the present invention. This embodiment is characterized by the setting of the predetermined period in the first embodiment, and the other parts are the same as in the first embodiment.

  Referring to FIG. 4, an example in which remote control code signal A is normally received by first light receiving unit 11a and remote control code signal B is normally received by second light receiving unit 11b is shown as an example in FIG. An example of output restriction processing in the code waveform shaping unit selection unit 13 will be described. In this example, it is assumed that the signals A and B are 48-bit signals transmitted from the remote controllers A and B, respectively, continuously at a transmission interval of 135 ms.

  First, in the prior art, when different codes are entered in sd1 and sd2 at different timings as shown in FIG. 4, the CPU section performs code in the order of A code → B code → A code → B code → A code → B code. Will receive. In this case, the CPU unit cannot execute smooth processing because the A code and the B code enter alternately.

  For example, when the volume up key of the remote control A is pressed and held down, the CPU unit gradually increases the volume at first, but when the same key is pressed for a certain period of time, the CPU unit increases the volume to increase the pace. However, if the code of the remote control B is adopted in the middle, such processing cannot be executed. In the case of the power key, since another code is mixed in the middle of the code, it may be determined that the power key is once released, and the power is continuously turned ON / OFF.

  In contrast, in the present embodiment, as described in the first embodiment, when the signal of the light receiving unit n is once output to the CPU unit 14, the output of other light receiving units is prohibited using sdo (n) as a trigger. The signal sde (n) to be output is output. Furthermore, also in this embodiment, every time the code waveform shaping unit selection unit 13 outputs a remote control code signal, the measurement for a predetermined period is reset.

  In the case of FIG. 4, first, sdo1 is output to the OR element 13c when the first pulse of the signal A arrives, and the timer buffer 13d performs the second (to fourth) code waveform shaping unit 12b (to 12d). “1” is output as sde2 (˜sde4) to the AND element 13b. That is, sde (other than 1) becomes 1 with this signal sdo1 as a trigger, and other signals are blocked. At the same time, the timer buffer 13d starts counting and measures only for a predetermined time.

  Further, in the present embodiment, the predetermined period is determined based on the interval (transmission interval) at which the same remote control code signal is continuously generated, that is, based on the reception interval set in the decoding processing unit exemplified by the CPU unit 14. The period. In this example, the predetermined period is set so as to provide a limited period of 160 ms, which is a value greater than 135 ms.

  Accordingly, since the timer is updated at the same 135 ms interval as the remote control code signal A until the first to third times, and the fourth time is updated at 160 ms, the CPU unit 14 performs the order of A code → A code → A code → B code. You can receive a code. By adopting such setting for a predetermined period and maintaining sde (n) through the timer buffer 13d for a certain period, the CPU unit 14 receives the code until the remote controller key is pressed once and then released. Only the light receiving unit can be enabled. Therefore, when different codes enter the plurality of light receiving units, it is possible to prevent the codes from being interrupted and performing an operation not intended by the user.

  As another form, the predetermined period is based on a continuous period (the continuous total period, which is three times the transmission interval in this example) in which the same remote control code signal is continuously issued from the remote controller, that is, the CPU unit 14. The same effect can be obtained by setting the period to be determined based on the continuous reception interval set by the decoding processing unit exemplified in (1). In the example of the signals A and B, it is preferable to provide a limited period with a value larger than 135 ms × 3 = 405 ms. In this embodiment, it is not necessary to reset the measurement for a predetermined period each time the code waveform shaping unit selection unit 13 outputs the remote control code signal.

(Embodiment 3)
FIG. 5 is a timing chart for explaining another example of the output restriction process in the code waveform shaping unit selection unit of FIG. 2, and is a diagram for explaining still another embodiment of the present invention. This embodiment is characterized by the setting of the predetermined period in the first embodiment, and the other parts are the same as in the first embodiment.

  First, in the prior art, when different codes enter sd1 and sd2 at different timings as shown in FIG. 4, the output codes overlap and cannot be received well by the CPU unit.

  In contrast, in the present embodiment, as described in the first embodiment, when the signal of the light receiving unit n is once output to the CPU unit 14, the output of other light receiving units is prohibited using sdo (n) as a trigger. The signal sde (n) to be output is output. Furthermore, also in this embodiment, every time the code waveform shaping unit selection unit 13 outputs a remote control code signal, the measurement for a predetermined period is reset.

  In the case of FIG. 5, first, sdo1 is output to the OR element 13c when the first pulse of the signal A arrives, and the timer buffer 13d performs the second (to fourth) code waveform shaping unit 12b (to 12d). “1” is output as sde2 (˜sde4) to the AND element 13b. That is, sde (other than 1) becomes 1 with this signal sdo1 as a trigger, and other signals are blocked. At the same time, the timer buffer 13d starts counting and measures only for a predetermined time.

  Further, in the present embodiment, the predetermined period is determined based on the output period of sdo (n), that is, based on the output processing period to the decoding processing unit exemplified by the CPU unit 14. In this example, the predetermined period is set so as to provide a limited period of 80 ms.

  Therefore, since the timer is updated every 80 ms, which is the same as the output interval of sdo (n), the CPU unit 14 can receive codes in the order of A code → A code → B code → B code. Thus, by setting the timer set value to the output processing period to the CPU unit 14, it is possible to prevent the codes of other light receiving units from overlapping during output to the CPU unit 14.

  As illustrated here, when the remote control code signal is output as it is, this period is variable by changing the bit width, but has a certain margin (such as a maximum value that can be assumed). By doing so, setting is possible. Further, for example, when a series of identical remote control code signals are converted and then output, this period can always be treated as constant.

(Embodiment 4)
FIG. 6 is a diagram for explaining still another embodiment of the remote control signal receiving apparatus according to the present invention. The remote control signal receiving apparatus of this embodiment uses the code waveform shaping units 12a to 12d, the code waveform shaping unit selection unit 13 and the CPU unit 14 in the first to third embodiments described above as first and second control operation units. When configured, the configuration that enables the processing from waveform shaping to decoding (and analysis, etc.) to be executed reliably is realized.

  In the present embodiment, the code waveform shaping units 12a to 12d connected to the plurality of light receiving units 11a to 11d and the CPU unit 14 based on the code output determination signal se (n) output from the code waveform shaping units 12a to 12d. The code waveform shaping unit selection unit 13 that selects the code waveform shaping units 12a to 12d that output the remote control code signal sd (n) to be decoded in step S1 and the remote control code signal output from the code waveform shaping unit selection unit 13 are decoded ( And a CPU unit 14 that performs processing such as analysis / execution processing) is configured separately into a first control calculation unit exemplified by the first CPU 101 and a second control calculation unit exemplified by the second CPU 102. Here, the first CPU 101 includes first to fourth code waveform shaping units 12 a to 12 d and a code waveform shaping unit selection unit 13, and the second CPU 102 includes a CPU unit 14.

  The light receiving units 11a to 11d, the code waveform shaping units 12a to 12d, the code waveform shaping unit selection unit 13, and the CPU unit 14 have the functions described in the above embodiments. It can be applied to the embodiment.

  The remote control signal receiver of this embodiment operates in the low power consumption mode. For example, in an image display apparatus equipped with a remote control signal receiving apparatus, generally, the apparatus itself is shifted to a low power consumption mode to reduce the power consumption of the apparatus. In such a low power consumption mode, the remote control signal receiving device that receives and decodes the remote control code signal also shifts to the low power consumption mode. In this case, both the first CPU 101 and the second CPU 102 shift to the low power consumption mode, and decoding is impossible in this state.

  When each of the CPUs 101 and 102 returns from the low power consumption mode to the normal operation mode, each of the CPUs 101 and 102 becomes low by using a waveform signal (including a remote control code signal) that has entered one of the light receiving portions 11a to 11d as a trigger. Return from the power consumption mode to the normal operation mode. For example, the image display apparatus returns from the low power consumption mode to the normal operation mode when the power key of the remote control is pressed in the low power consumption mode. Such a remote control code signal by operating the power key is transmitted continuously twice, for example. That is, the first CPU 101 and the second CPU 102 individually operate with low power consumption, and individually return from the low power consumption mode to the normal operation mode using the input pulse signal as a trigger.

  At this time, the first CPU 101 starts recovery by the first remote control code signal, but it takes time to recover, and the waveform signal of the first remote control code signal is missed. The waveform is shaped with the second remote control code signal, and the remote control code signal with the waveform shaped is output from the code waveform shaping unit selection unit 13 to the second CPU 102. At this time, the second CPU 102 starts recovery by an output signal from the first CPU 102, but in this case as well, it takes time to recover and the remote control code signal cannot be correctly decoded.

  In order to solve such a problem, in the present embodiment, the first CPU 101 can correct the waveform of the first remote control code signal that has entered the light receiving units 11a to 11d to some extent when the second CPU 102 corrects the waveform. In response to this, a pulse signal for returning the second CPU 102 is output. “To some extent correct” means that the waveform can be correctly shaped to a predetermined level. The predetermined level condition is determined in advance. For example, when the allowable range of the number of bits and the pulse width is determined and the waveform is shaped with an error within the allowable range, it can be determined that the waveform has been correctly shaped to a predetermined level.

  FIG. 7 is a diagram for explaining a return processing example from the low power consumption mode in the remote control signal receiving device of FIG. 6, in which the waveform signal shaped by the arbitrary code waveform shaping unit of the first CPU is shown in the upper stage. The output pulse signal from is shown in the lower part. Here, a waveform signal from the first light receiving unit 11a will be described as an example.

  In FIG. 7, when a waveform signal enters the first CPU 101 from the first light receiving unit 11a, the first CPU 101 starts to return from the low power consumption mode to the normal operation mode at the timing t1 at the beginning of the waveform signal. . At the same time, the first code waveform shaping unit 11a shapes the waveform signal. At this time, since the first CPU 101 is returning, the waveform shaping cannot be performed correctly. However, if the correct code waveform can be shaped to some extent, a pulse signal (WAKE UP pulse) for returning the second CPU 102 from the low power consumption mode to the normal operation mode at the last timing t2 of the first waveform signal. ) Is output to the second CPU 102. The WAKE UP pulse is set as a pulse signal that is not related (not confused) with the remote control code signal.

  Since the code waveform shaping unit 11a returns to the normal operation mode when the second waveform signal is input (timing t3), the waveform signal can be shaped into a correct waveform. When the second waveform signal is shaped, a correct remote control code signal based on the waveform signal can be output to the second CPU 102 (timing t4).

  The second CPU 102 starts to return from the low power consumption mode to the normal operation mode by the WAKE UP pulse output from the first CPU 101. Since the return operation is completed at the timing t4 when the correct remote control code signal is output from the first CPU 101, the remote control code signal output from the first CPU 101 can be correctly decoded.

  As described above, the processing from the code waveform shaping to the decoding is executed by the two CPUs, so that the power consumption by the operations of these CPUs can be reduced. For example, when noise that has entered the light receiving unit is regarded as a waveform signal to be returned to the normal operation mode, the CPU needs to perform a return operation. At this time, the processing is performed by the two CPUs as in the present embodiment, so that it is possible to reduce the processing system that returns to the normal operation mode every time noise occurs, and to reduce power consumption.

  That is, the first CPU 101 returns to the normal operation mode even when noise enters instead of the correct remote control code signal, but the second CPU 102 is still in the low power consumption mode at this point. Since the first CPU 101 cannot normally shape the waveform of the noise correctly, the second CPU 102 can be maintained in the low power consumption mode without outputting a WAKE UP pulse for returning the second CPU 102. In particular, in the configuration having a plurality of light receiving units, noise easily enters, and thus the configuration of the present embodiment is effective. In the configuration of this example, the power consumption of the first CPU 101 is less than the power consumption of the second CPU 102, so the effect of reducing the power consumption is increased.

An example of the effect of reducing power consumption obtained by the configuration of the present embodiment will be shown below.
1) Power consumption of the first CPU (when the normal operation mode is 10 MHz)
Normal operation mode 6mA ... a
Low power consumption mode 0.0007 mA ... b
2) Power consumption of second CPU (in normal operation mode 10 MHz)
Normal operation mode 15mA ... c
Low power consumption mode 0.110 mA ... d
3) Power consumption by the conventional configuration (configuration with one CPU) 15mA when the CPU is restored due to noise ... e
Low power consumption mode in a noise-free environment 0.110 mA ... f

  In the example of the present embodiment, for example, when the first CPU recovers due to noise, the power consumption is 6.110 mA (= a + d), which is smaller than the conventional e. In the configuration of this embodiment, in the low power consumption mode in a noise-free environment, it becomes 0.1107 mA (= b + d), which is almost the same as the conventional f.

  In other words, regarding the power consumption in the low power consumption mode, the power consumption in an environment without noise is almost the same as +0.00007 mA in the configuration of the present embodiment compared with the configuration of one CPU. In an environment in which the power always enters (environment where it is easy to enter), it is possible to reduce power consumption by about 8.9 mA (15 mA-6.11 mA).

  Furthermore, according to the configuration of the present embodiment, the first CPU 101 including the code waveform shaping units 12a to 12d and the code waveform shaping unit selection unit 13 and the CPU unit 14 that performs processing of decoding (and analyzing) the remote control code signal are provided. Since the second CPU 102 provided is created as a separate device and has a configuration in which these devices are connected, it is possible to cope with specification changes and the like at low cost, and to have versatility. For example, when the specification change of the number of light receiving units occurs, the specification change can be dealt with by replacing the first CPU 101. That is, according to the configuration of the present embodiment, the specification can be easily changed, and a common component such as the second CPU 102 can be used as a common component between different specifications, so that the versatility of the apparatus can be improved.

  The present embodiment can also be applied to the case where the first CPU 101 and the second CPU are physically incorporated in one device. For example, the WAKE UP pulse is effective even inside a device such as a dual core processor.

It is a block diagram for demonstrating one Embodiment of the remote control signal receiver by this invention. FIG. 2 is a diagram illustrating a configuration example of a code waveform shaping unit selection unit in the remote control signal receiving device of FIG. 1 as a logic circuit. 3 is a timing chart for explaining in detail an output restriction process in a code waveform shaping unit selection unit in FIG. 2; It is a timing chart for demonstrating an example of the output limitation process in the code waveform shaping part selection part of FIG. 2, and is a figure for demonstrating other embodiment of this invention. It is a timing chart for demonstrating the other example of the output limitation process in the code waveform shaping part selection part of FIG. 2, and is a figure for demonstrating other embodiment of this invention. It is a figure for demonstrating other embodiment of the remote control signal receiver by this invention. It is a figure for demonstrating the example of a return process from the low power consumption mode in the remote control signal receiver of FIG.

Explanation of symbols

11a ... 1st light receiving part, 11b ... 2nd light receiving part, 11c ... 3rd light receiving part, 12a ... 1st code waveform shaping part, 12b ... 2nd code waveform shaping part, 12c ... 3rd code waveform shaping part, 12d ... 4th code waveform shaping unit, 13... Code waveform shaping unit selection unit, 13a, 13b... AND element, 13c... OR element, 13d.

Claims (8)

A plurality of receivers for receiving a remote control code signal transmitted from the remote control;
A plurality of code waveform shaping units connected to each of the plurality of reception units, and performing waveform shaping of a remote control code signal received by the reception unit;
Select a code waveform shaping unit that outputs a remote control code signal to be used for decoding from among the plurality of code waveform shaping units, and select a code waveform shaping unit that outputs a remote control code signal from the selected code waveform shaping unit And
A remote control signal receiving device comprising:
Each code waveform shaping unit determines whether or not the waveform shaping of the remote control code signal received by each receiving unit is successful,
The code waveform shaping unit selecting unit, based on the determination result, a shaping unit selecting means for selecting the code waveform shaping unit that outputs a remote control code signal to be used for decoding, and the selected code waveform shaping unit A remote control signal receiving apparatus comprising: output restriction means for prohibiting output of a remote control code signal input from a code waveform shaping unit other than a predetermined period. The remote control signal receiver according to claim 1,
The remote control signal receiving apparatus according to claim 1, wherein the code waveform shaping unit selection unit resets the measurement for the predetermined period each time a remote control code signal is output. In the remote control signal receiver according to claim 1 or 2,
The remote control signal receiving apparatus according to claim 1, wherein the predetermined period is a period determined based on an interval at which the same remote control code signal is continuously emitted from the remote controller or a continuous period thereof. In the remote control signal receiver according to claim 2,
A decoding processing unit for decoding the remote control code signal output by the code waveform shaping unit selection unit;
The remote control signal receiving apparatus according to claim 1, wherein the predetermined period is a period determined based on an output processing period to the decoding processing unit. In the remote control signal receiver according to any one of claims 1 to 4,
Each code waveform shaping unit outputs a remote control code signal to the code waveform shaping unit selection unit only when the result of the determination indicates success. In the remote control signal receiver according to any one of claims 1 to 5,
A decoding processing unit for decoding the remote control code signal output by the code waveform shaping unit selection unit;
The code waveform shaping unit, the code waveform shaping unit selection unit, and the decode processing unit include a first control operation unit including the code waveform shaping unit and the code waveform shaping unit selection unit, and the decode processing unit. Including a second control calculation unit including,
The first control calculation unit and the second control calculation unit can individually operate in the low power consumption mode, and the first and second control calculation units operate in the low power consumption mode. When the first control calculation unit receives the remote control code signal from the reception unit, the first control calculation unit returns from the low power consumption mode to the normal operation mode, and the remote control code signal Waveform shaping is started, and a pulse signal for returning the second control computation unit from the low power consumption mode to the normal operation mode is transmitted to the second control computation unit according to the waveform shaping result. A remote control signal receiving device. In the remote control signal receiver according to claim 6,
In the low power consumption mode, when the first control operation unit repeatedly receives the remote control code signal from the reception unit repeatedly, the first remote control code signal by the code waveform shaping unit is reduced to a predetermined level. If it is determined that the waveform has been correctly shaped, the pulse signal is transmitted at the end of the waveform shaping of the first remocode signal,
The remote control signal receiving apparatus according to claim 1, wherein the second control calculation unit starts returning from the low power consumption mode to the normal operation mode by receiving the pulse signal.   The image display apparatus provided with the remote control signal receiver of any one of Claims 1-7.

Images