JP2009049916A - Remote control system, receiver and electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set an authentication code by a simple operation without the need of an additional wireless communication part. <P>SOLUTION: The authentication code is prepared (S1), and an LED emits light according to the authentication code or a numeral is displayed (S2). The key of a remote controller corresponding to the presented code is depressed (S21), the authentication code is inputted by two or more operations and a key input confirmation packet is transmitted (S22). The confirmation packet is received and matching with the prepared authentication code is detected (S5). When matching does not succeed, an authentication failure is defined (S14). When succeeds, a cipher text using the authentication code is transmitted to the other side, a cipher text obtained by reencrypting a plain text decrypted by the other side by the authentication code is received, the received cipher text is decrypted, and whether or not it matches with the plain text is verified. When mutual authentication is completed, the authentication code is shared by each other (S13). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a remote control system, a receiving apparatus, and an electronic device that are applied to remote control of an electronic device using a wireless communication method.

If remote control of household controlled devices such as television receivers is used, for example, 2.4GHz band ISM (Industrial, Scientific and Medical use) band wireless communication is used, it is a shield compared to infrared systems. This has the advantage of reducing the influence of and extending the reach. Furthermore, when a device such as a DVD (Digital Versatile Disc) playback device, AV amplifier, projector, etc. is installed in different places in a room as in a home theater, there is the trouble of directing the infrared remote controller in each direction. Devices installed outside the room cannot be controlled directly. On the other hand, in the case of a remote control system using radio such as Bluetooth (BlueTooth) or IEEE (Institute of Electrical and Electronics Engineers) 802.15.4 (also called Zigbee), radio waves are propagated at a wide angle. Therefore, there is an advantage that restrictions on the installation location of each electronic device are reduced.

  On the other hand, because the radio waves are non-directional, transmission data can be read (skimmed) by others in the vicinity, or a fake remote controller can be operated as if it were a real one. There is a risk of impersonation. In particular, recently, television receivers are connected to the Internet for transactions with banks, shopping, and exchange of cash and credit card information, and there is a need to increase security. It is increasing.

  In order to communicate securely between the remote controller and the electronic device to be controlled, a common key is exchanged between them (hereinafter referred to as authentication as appropriate), and communication is performed using the common key during transmission. A method of encrypting the contents is adopted. The simplest method of setting a key in a device is a method of manually inputting key information to each device. However, this method requires the user to remember key information in order to input without a doubt, and has a problem of forcing the user to perform complicated operations. Furthermore, it is necessary to provide some kind of user input device for all devices.

  The next conceivable method is a method of exchanging a common key using a cable, for example, a USB (Universal Serial Bus) cable only at the time of authentication. Although this method frees the user from complicated operations, a cable that is originally not necessary for communication must be enclosed, and the user must keep the cable for the next authentication.

  In addition to a communication device used for normal communication, for example, a short-range wireless communication device, an infrared communication device, and the like are provided and authentication is performed using these communication devices. ing.

JP 2005-217646 A

  However, remote control systems for many AV devices such as television receivers are realized at a very low cost, and it is not possible to use a communication device different from the device used for normal communication for authentication. Difficult in terms of cost.

  Therefore, an object of the present invention is to provide a remote control system, a receiving apparatus, and an electronic apparatus that can perform authentication by a simple operation without using another communication device for authentication.

In order to solve the above-described problem, the present invention provides a remote control system in which a control instruction from a remote controller is transmitted to a receiving device connected to an electronic device as a controlled device wirelessly.
The remote controller includes a wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, a key input unit including an authentication code setting key, and a control unit.
The receiving device includes a wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, a display unit including one or a plurality of light emitting elements for presenting the authentication code, and an electronic device as a controlled device. An interface with the device and a control unit;
At the time of authentication setting, the receiving device generates an authentication code, and controls the lighting of the light emitting element of the display unit corresponding to the generated authentication code,
In this remote control system, an authentication code is set in the remote controller by operating an authentication code setting key corresponding to lighting of the light emitting element of the remote controller.

The present invention provides a remote control system in which a control instruction from a remote controller is wirelessly transmitted to a receiving device connected to an electronic device as a controlled device.
The remote controller includes a wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, a key input unit including a numeric key, and a control unit.
The receiving device includes a wireless communication unit, a storage unit that stores an authentication code, an encryption / decryption circuit, an interface with an electronic device as a controlled device including a display unit, and a control unit.
At the time of authentication setting, the receiving device generates an authentication code, and controls to display the number of the authentication code on the display unit of the electronic device corresponding to the generated authentication code,
This is a remote control system in which an authentication code is set in the remote controller by operating the numeric keys corresponding to the numbers displayed on the display unit.

This invention is connected to an electronic device as a controlled device, in a receiving device of a remote control system in which a control instruction from a remote controller is transmitted wirelessly.
A wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, a display unit including one or a plurality of light emitting elements for presenting the authentication code, an interface with an electronic device, a control unit, Have
This is a receiver for a remote control system that generates an authentication code at the time of authentication setting, and presents the authentication code to the remote controller side by controlling lighting of the light emitting element of the display unit corresponding to the generated authentication code.

This invention is connected to an electronic device as a controlled device, in a receiving device of a remote control system in which a control instruction from a remote controller is transmitted wirelessly.
A wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, an interface with an electronic device as a controlled device including a display unit, and a control unit,
An authentication code is generated at the time of authentication setting, and the authentication code is displayed on the display unit of the electronic device corresponding to the generated authentication code. is there.

The present invention provides an electronic apparatus including a receiving device of a remote control system in which a control instruction from a remote controller is transmitted to a receiving device wirelessly.
The receiving device
A wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, a display unit including one or a plurality of light emitting elements for presenting the authentication code, an interface with an electronic device, a control unit, Have
An electronic device including a receiving device of a remote control system that generates an authentication code at the time of authentication setting and presents the authentication code to the remote controller side by controlling the lighting of the light emitting element of the display unit corresponding to the generated authentication code It is.

The present invention provides an electronic apparatus including a receiving device of a remote control system in which a control instruction from a remote controller is transmitted to a receiving device wirelessly.
The receiving device
A wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, an interface with an electronic device as a controlled device including a display unit, and a control unit,
A remote control system receiving device that presents an authentication code to the remote controller by generating an authentication code and displaying the number of the authentication code on the display unit of the electronic device corresponding to the generated authentication code at the time of authentication setting It is an electronic device provided.

  According to the present invention, an existing hardware configuration can be used as a remote controller, and there is no need to use another communication device for authentication, and a low-cost configuration can be achieved. Further, there is no need for the user to perform complicated operations for authentication. Furthermore, it is possible to perform authentication by limiting the pair of remote controller and electronic device that can be authenticated by the user's visual verification of the authentication code, even in an environment where a plurality of electronic devices are installed. There is an advantage of not requiring hardware or software to identify.

  An embodiment of the present invention will be described below with reference to the drawings. One embodiment is applied to a remote control system that remotely controls an electronic device in a home. One transmission device (hereinafter appropriately referred to as a remote controller) for transmitting remote control instruction data (hereinafter appropriately referred to as a command) according to a user operation, and an operation instructed by receiving the transmitted command A remote control system is configured by one or more controlled devices (receiving device and electronic device) to be performed.

Electronic devices include television receivers, video recording / playback devices (specifically, DVD (Digital Versatile Disc) players, disk recorders, VCRs (Video Cassette Recorders))
Etc.), audio recording / reproducing devices (specifically, CD players, MD recorders, audio amplifiers, FM tuners, etc.), AV equipment such as projectors, and electronic equipment such as household electric products such as refrigerators. The remote controller is driven by a built-in power supply, and the electronic device is driven by a commercial power supply, for example.

FIG. 1 shows the configurations of a remote controller and a receiving device (hereinafter referred to as a receiving module as appropriate) in an embodiment of a remote controller system. As shown in FIG. 1A, a remote controller 100 includes an antenna 101 for transmitting and receiving radio waves, and a microprocessor as a control unit that operates a communication function, an address storage medium read / write operation, and a program corresponding to various key inputs. (Hereinafter referred to as a CPU (Central Processing Unit)) 102, a communication unit 103 for wireless communication, DES (Data Encryption Standard) for encrypting and decrypting plaintext communication information, 3DES, AES (Advanced Encryption Standard), etc. An encryption circuit 104 that performs encryption and decryption, a storage medium 105 that stores key information used when the encryption circuit 104 performs encryption and decryption, a random number generator 106 that outputs random numerical values, Volume up / down button, channel up / down button, numeric keypad, 4 color buttons (blue key KB, red key) KR, green key KG, and a key input unit 107 having a key yellow key KY) or the like. Since the remote controller of an existing television receiver usually has four color buttons, the existing one can be used as the hardware of the remote controller 100. The storage medium 105 is constituted by, for example, a nonvolatile memory. The CPU 102 includes a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and comprehensively controls each unit of the remote controller 100 by executing a program stored in the ROM.

  As shown in FIG. 1B, the receiving module 110 of the remote control system includes an antenna 111 for transmitting and receiving radio waves, a CPU 112 for operating a communication function, a read / write operation of an address storage medium, and a program corresponding to various key inputs, A communication unit 113 for wireless communication, an encryption circuit 114 that encrypts and decrypts DES, 3DES, AES, and the like that encrypts and decrypts plaintext communication information, and an encryption circuit 114 performs encryption and decryption A storage medium 115 for storing key information to be used at the time, a random number generator 116 for outputting random numerical values, a communication interface 117 for exchanging data with an electronic device to which the receiving module 110 is attached, and four colors Light emitting parts such as LEDs (Light Emitting Diodes) (blue LEDLB, red LEDLR, green LED display unit 118 having LEDLG, yellow LEDLY). The storage medium 115 is configured by a nonvolatile memory, for example. The CPU 112 includes a ROM, a RAM, and the like, and comprehensively controls each unit of the reception module 110 by executing a program stored in the ROM.

  In the above-described embodiment, the LED display unit 118 in the receiving module 110 is used as a display for performing settings during authentication. However, when the electronic device to which the receiving module is attached includes a display, the authentication code can be displayed on the display without providing the LED display unit 118. The configurations of a remote controller 200 and a receiving module 210 that can be applied to the second embodiment of such a remote control system are shown in FIGS. 2A and 2B, respectively.

  As shown in FIG. 2A, the remote controller 200 includes an antenna 201 for transmitting and receiving radio waves, a CPU 202 as a control unit for operating a communication function, a read / write operation of an address storage medium, and a program corresponding to various key inputs, A communication unit 203 for wireless communication, an encryption circuit 204 such as DES, 3DES, and AES for encrypting and decrypting plaintext communication information, and key information used when the encryption circuit 204 performs encryption and decryption As a storage medium 205 for storing an authentication code, a random number generator 206 for outputting a random numerical value, a volume up / down button, a channel up / down button, a numeric keypad, four color buttons (blue key KB, red key KR, green Key input unit 207 having keys such as key KG and yellow key KY). The storage medium 205 is composed of, for example, a nonvolatile memory. The CPU 202 includes a ROM, a RAM, and the like, and comprehensively controls each unit of the remote controller 200 by executing a program stored in the ROM.

  As shown in FIG. 2B, the reception module 210 of the remote control system includes an antenna 211 for transmitting and receiving radio waves, a CPU 212 for operating a communication function, a read / write operation of an address storage medium, and a program corresponding to various key inputs, A communication unit 213 for wireless communication, an encryption circuit 214 such as DES, 3DES, and AES for encrypting and decrypting plaintext communication information, and key information used when the encryption circuit 214 performs encryption and decryption As a storage medium 215 for storing an authentication code, a random number generator 216 for outputting a random numerical value, and a communication interface 217 for exchanging data with an electronic device to which the receiving module 210 is attached. . The storage medium 215 of the reception module 210 is constituted by, for example, a nonvolatile memory. The CPU 212 includes a ROM, a RAM, and the like, and comprehensively controls each unit of the receiving module 210 by executing a program stored in the ROM.

  The communication units 103 and 203 of the remote controllers 100 and 200 and the communication units 113 and 213 of the reception modules 110 and 210 perform bidirectional communication using a predetermined wireless communication method. As a communication method, Bluetooth, IEEE 802.15.4, IEEE 802.11 (wireless LAN), or the like can be used. Each of the communication interfaces 117 and 217 is realized by, for example, an existing infrared remote control system. That is, the receiving modules 110 and 210 function as a flowchart conversion device from wireless to infrared. Specifically, by making each infrared light emitting portion of the communication interface 117, 217 face the light receiving portion of the infrared remote control signal of the existing electronic device, the existing electronic device is made into a remote controller system by wireless communication. It becomes possible to change.

  FIG. 3 shows an example of a viewing system (viewing environment) to which an embodiment of the present invention is applied. A reception module 311 is attached to the projector 310. The reception module 311 supplies the received remote control signal to the system controller inside the projector 310 and transmits the transmission signal as a radio wave. The receiving module 311 has the configuration shown in FIG.

  The LED display unit 118 of the receiving module 311 is provided on the front panel of the device, and the LB (blue), LR (red), LB (green), and LY (yellow) LEDs emit light (on) / extinguish (off). Is visible to the user operating the remote controller 300. Since the projector 310 does not originally have a display unit, each LED of the LED display unit 118 emits light according to the authentication code at the initial setting, and the user follows the light emission of each LED of the LED display unit 118 and the remote controller 300. Authentication settings are made by pressing the four-color buttons KB to KY.

In addition to the projector 310, other AV equipment such as a television receiver 320 and a DVD playback device 330 are installed in the same room. A reception module 321 is connected to the television receiver 320. The television receiver 320 has a display screen 322 such as an LCD (Liquid Crystal Display). A receiving module 331 is attached to the DVD playback device 330. The DVD playback device 330 has a small LCD display unit 332. The receiving modules 321 and 331 supply the received remote control signals to the system controllers of the television receiver 320 and the DVD playback device 330, and send out transmission signals as radio waves. The receiving modules 321 and 331 have the configuration shown in FIG. 2B.

  At the time of authentication setting, the number of the generated authentication code is displayed on the display screen 322 via the communication interface 217 (see FIG. 2B). The user visually recognizes the number and inputs the number by pressing the corresponding number key of the remote controller 300. The authentication code can be input by repeating the numeric input operation. The authentication code is converted into a decimal number, and the authentication code is input for each decimal digit. In the remote controller 300, the input numeric string is converted into an authentication code. When it is verified that the input authentication code is correct, the authentication code is stored in the storage media 105 and 205.

  The receiving modules 311, 321, and 331 attached to each electronic device are always supplied with power regardless of the state of the power button of the device. However, when the main power switch is cut, the power supply to the receiving module is cut off. The reception modules 311, 321, and 331 are separately manufactured as components added to each electronic device, and have a MAC address that is a device-specific address at the time of manufacture. A MAC address that is a unique address is also given to the remote controller 300 at the time of manufacture. The remote controller 300 has been paired with each of the receiving modules 311, 321 and 331, and is set in a state in which wireless communication can be performed with each other.

  The authentication operation will be described with reference to FIG. In the flowchart of FIG. 4, steps S <b> 1 to S <b> 12 are processes in the reception modules 311, 321 and 331, and steps S <b> 21 to S <b> 28 are processes in the remote controller 300. Processing in the remote controller 300 is executed under the control of the CPUs 102 and 202, and processing in the receiving module 200 is executed under the control of the CPUs 112 and 212.

  First, in step S1, the receiving modules 110 and 210 create an authentication code (common key Kc1) by the random number generators 106 and 206. The created authentication code is temporarily stored and presented to the user with the remote controller. The receiving module 311 (having the configuration shown in FIG. 1B) attached to the projector 310 in FIG. 3 causes the LED display unit to emit light according to the authentication code. That is, when the authentication code has 2N bits, the most significant (or least significant) 2 bits are cut out, and one of the four color LEDs is caused to emit light according to the 2-bit pattern. As an example, when the 2 bits are (00), the blue LEDLB is caused to emit light. Similarly, when the 2 bits are (01), (10), and (11), the red LEDLR, the green LEDLG, and the yellow LEDLY emit light.

  In the case of the television receiver 320, after converting the authentication code to a decimal number, a single digit number located at the maximum digit (or the minimum digit) is cut out, and the cut out single digit number is sent via the communication interface 217. The data is transmitted to the connected television receiver 320. The television receiver 320 displays the received number on the display screen 322. In the example of FIG. 3, an example in which the numeral “3” is displayed on the display screen 322 is shown. Similarly, in the DVD playback device 330, the one-digit number of the authentication code is displayed on the display unit 332 as well.

  The user visually recognizes the LED display unit 118 and presses the button of the same color as the LED that emits light, or presses the same numeric key as the one-digit number of the displayed authentication code (step S21). The CPUs 102 and 202 temporarily store the key contents (the button of the pressed color or the numeric key), create a key input confirmation packet including code information indicating the key contents, and the communication units 103 and 203 and the antenna 101. , 201 to the receiving modules 110 and 210.

  A packet to be transmitted / received usually includes a header and a payload, and a transmission source address, a transmission destination address, and the like are inserted into the header. In the payload, a command ID indicating a command type and a command are arranged. A payload of a packet transmitted from the remote controller after the authentication is established includes a command ID and a command. As a signal format corresponding to the command, for example, the same format as that related to the existing infrared remote controller is used.

  In step S3, the reception module receives the input confirmation packet through the antennas 111 and 211 and the communication units 113 and 213, and extracts and stores an authentication code (part) included in the input confirmation packet. In step S4, it is determined whether all bits or all digits of the authentication code have been received. In the case of assigning 2 bits to the LED color, it is determined that all bits have been received when N receptions are performed. Steps S2 and S3 are repeated until the number of receptions reaches N. In the case of the method for presenting the number of the authentication code, it is determined in step S4 whether or not all the digits (for example, N digits) of the number converted into the decimal number have been received. If the result of step S4 is affirmative, it means that the input of the authentication code is completed in the remote controller. The authentication code (common key Kc2) input by the remote controller is stored.

  If it is determined in step S4 that all bits or digits of the authentication code have been received, in step S5, the authentication code (common key Kc1) generated by the receiving module and the authentication code received from the remote controller (common) It is determined whether or not the key Kc2) matches. If it is determined that they do not match, it is determined in step S14 that the authentication has failed, and the subsequent processing is not performed.

  In the above-described processing, if there is no error in the user's visual recognition result and key input based on the visual recognition result, it should be (Kc1 = Kc2) and should share the authentication code with each other (step S6). A process for verifying this is performed, and the wrong common key is prevented from being stored in the storage medium.

  In step S7, the receiving modules 110 and 210 create the plaintext R1 using the random number generators 116 and 216, and the encryption circuits 114 and 214 encrypt the plaintext R1 using the common key Kc1 to create the ciphertext packet PR11. The ciphertext packet PR11 is transmitted to the remote controllers 100 and 200 through the communication units 113 and 213 and the antennas 111 and 211.

  In step S23, the remote controllers 100 and 200 receive the ciphertext packet PR11. In step S24, the ciphertext is decrypted by the encryption circuits 104 and 204 using Kc2, and the decrypted plaintext is encrypted again. Encryption is performed by the circuits 104 and 204. As a result, a ciphertext PR12 is obtained. In step S25, the obtained ciphertext PR12 is transmitted to the receiving modules 110 and 210 on the other side through the communication units 103 and 203 and the antennas 101 and 201.

  The ciphertext is received from the remote controllers 100 and 200, and the ciphertext is decrypted by the encryption circuits 114 and 214 using Kc1 (step S8). It is determined whether or not the decrypted plaintext matches the plaintext R1 originally transmitted by the receiving module (step S9). If they do not match, it is determined that the authentication has failed, and the process proceeds to step S14. If the decrypted plaintext matches the plaintext R1 originally transmitted by the receiving module, it is determined that the authentication has succeeded, and then the same processing is performed by exchanging the remote controller and the receiving module.

  In step S26, the remote controllers 100 and 200 create the plaintext R2 using the random number generators 106 and 206, and the encryption circuits 104 and 204 encrypt the plaintext R2 using the common key Kc2 to create the ciphertext packet PR21. The ciphertext packet PR21 is transmitted to the receiving modules 110 and 210 through the communication units 103 and 203 and the antennas 101 and 201.

  In step S10, the receiving modules 110 and 210 receive the ciphertext packet PR21. In step S11, the ciphertext is decrypted by the encryption circuits 114 and 214 using Kc1, and the decrypted plaintext is encrypted again. Encryption is performed by the circuits 114 and 214. As a result, a ciphertext PR22 is obtained. In step S <b> 12, the obtained ciphertext PR <b> 22 is transmitted to the remote controllers 100 and 200 on the other side through the communication units 113 and 213 and the antennas 111 and 211.

  The ciphertext is received from the receiving modules 110 and 210, and the ciphertext is decrypted by the encryption circuits 104 and 204 using Kc1 (step S27). It is determined whether or not the decrypted plaintext matches the plaintext R2 originally transmitted by the receiving module (step S28). If they do not match, it is determined that the authentication has failed, and the process proceeds to step S29. If the decrypted plaintext matches the plaintext R2 originally transmitted by the receiving module, it is determined that the authentication is successful.

  If the common key is successfully determined in both the remote controllers 100 and 200 and the receiving modules 110 and 210 by the above-described processing, the mutual authentication is completed (step S13). Here, the common keys are stored in the storage media 105, 115, 205, and 215, respectively.

  A description will be given of how the security of wireless transmission information in the remote control system is maintained when authentication is successful and terminated in this way. Note that, after the authentication is completed, the processes in both the configuration in FIG. 1 and the configuration in FIG. 2 are the same, and therefore the remote control system having the configuration in FIG. 1 will be described as an example.

  The user performs device operations such as channel switching and volume adjustment through the key input unit 107 of the remote controller 100. The CPU 102 that has detected the key input selects a command code corresponding to the key, and sends the command code (plain text) to the encryption circuit 104. An authentication code (common key) Kc1 stored in the storage medium 105 is set in advance in the encryption circuit 104, and encryption processing is performed using this common key.

  The ciphertext from the encryption circuit 104 is supplied to the communication unit 103 via the CPU 102. The communication unit 103 modulates a packet including a ciphertext, up-converts, and then superimposes the high-frequency carrier wave on the high-frequency carrier wave and transmits the packet to the reception module 110.

  The receiving module 110 supplies the signal received by the antenna 111 to the communication unit 113, removes the carrier wave, performs down-converting, performs demodulation processing, and receives the ciphertext. This ciphertext is supplied to the encryption circuit 114 via the CPU 112. An authentication code (common key) Kc2 stored in the storage medium 115 is set in advance in the encryption circuit 114, and decryption processing is performed using this common key. As a result of the decryption process, plain text (command code for remote control) is extracted.

  In the series of transmission / reception processes described above, all command codes are encrypted on the radio wave, and this ciphertext can be decrypted only by a device having a common key, and security can be maintained.

The communication units 103 and 203 included in the remote controllers 100 and 200 and the communication units 113 and 213 included in the reception modules 110 and 210 can use, for example, a physical layer of IEEE 802.15.4. IEEE 802.15.4 is the name of a short-range wireless network standard called PAN (Personal Area Network) or W (Wireless) PAN.

The communication rate of this standard is several tens of k to several hundreds kbps, and the communication distance is several tens of meters to
It will be several hundred meters. Communication is performed in units of frames. One frame has a payload (0 to 127 bytes), a header (6 bytes), and a maximum size of 133 bytes. In this communication method, multiple forms of transmission / reception methods are possible, but in the case of a remote control system, a method is adopted in which a command is sent from the remote controller to the receiving module and a response from the receiving module is received by the remote controller. Is done. However, more complicated transmission / reception methods can be used.

FIG. 5 shows a configuration of a transmitter included in the communication unit. The transmission data is supplied to a QPSK (Quadrature Phase Shift Keying) modulator 51 and QPSK modulated. The output signal of the QPSK modulator 51 is supplied to the spread modulator 52. The spread code generated by the code generator 53 is supplied to the spread modulator 52 and spread by the DSSS (Direct Sequence Spread Spectrum) method. A pseudo noise sequence is used as the spreading code. The DS (direct spreading) method is an SS (spread spectrum) method in which phase modulation is performed with a high-speed spreading code to spread the spectrum of a signal.

  The output signal of the spread modulator 52 is supplied to the multiplier 55 via the band filter 54. A local oscillation signal from a local oscillator 56 having a PLL configuration is supplied to the multiplier 55, and a transmission signal up-converted to a frequency band of 2.4 GHz is generated from the multiplier 55. A transmission signal is supplied to the antenna 58 via the amplifier 57 and transmitted. The transmission output can be varied by controlling the gain of the amplifier 57.

  As communication channels, 16 channels are set at intervals of 5 MHz, from 2.405 GHz to 2.410 GHz, 2.415 GHz,..., 2.480 GHz. In one embodiment, a plurality of, for example, three channels having frequencies that do not overlap as much as possible, such as frequencies that may be used in the wireless LAN, are used among the 16 channels. The channel is set by setting the local oscillation frequency output from the local oscillator 56 by the channel selection signal SL1. The selection signal SL1 is output from the control unit 60.

  The control unit 60 is, for example, a microcomputer including a CPU, a ROM, a RAM, and the like, and comprehensively controls each unit of the transmitter by executing a program stored in the ROM.

  In the transmitter of the remote controller, an input unit 59 such as keys, switches, buttons, and a touch panel for remote control is provided, and a command corresponding to the operation of the input unit 59 is transmitted to the electronic device. When the electronic device receives the command normally, the electronic device transmits a response to the remote controller.

FIG. 6 shows a configuration of a receiver included in the communication unit. A signal received by the antenna 71 is supplied to an LNA (Low Noise Amplifier) 72. The antenna 71 is usually shared with the antenna 58 of the transmitter, and the transmitter and the receiver are switched by a transmission / reception changeover switch. An output signal of the LNA 72 is supplied to the multiplier 73. A local oscillation signal from a local oscillator 74 having a PLL configuration is supplied to the multiplier 73, and a down-converted intermediate frequency signal (IF (Intermediate Frequency) signal) is generated from the multiplier 73.

The IF signal is supplied to the despreading unit (spreading demodulation unit) 76 via the intermediate frequency amplifier 75. The despreading unit 76 demodulates the received signal by correlating the reference spreading code generated on the receiving side. A correct correlation value cannot be obtained unless the timings of the received signal and the reference spread code are exactly matched. At the start of communication, the receiving side searches for timing and holds the searched timing. In order to look for timing, a correlator such as a matched filter is used.

  The demodulated signal of the despreading unit 76 is supplied to the QPSK demodulator 77 to perform QPSK demodulation. Received data is obtained from the QPSK demodulator 77. In the case of an electronic device, the received data is a command, and the command is supplied to the system controller 80 of the electronic device and used to control the operation of the electronic device. In the case of a remote controller, the received data is a response, and the received response is supplied to the control unit 79.

  The control unit 79 is a microcomputer including, for example, a CPU, a ROM, a RAM, and the like, and comprehensively controls each unit of the receiver by executing a program stored in the ROM. Actually, the control unit 60 of the transmitter and the control unit 79 of the receiver have a common configuration.

  The demodulated signal from the despreading unit 76 and the output signal from the LNA 72 are supplied to the reception state detection unit 78. The reception state detection unit 78 calculates a link quality indicator (LQI: Link Quality Indicator) from the strength of the signal itself and the strength of noise interference when receiving a frame, for example, a request signal at the time of authentication, and notifies the higher level of the physical layer It has the function to do. LQI is specified in the physical layer of IEEE 802.15.4 and is indicated by a value of digital data. LQI is a value corresponding to the error rate. LQI is supplied to the control unit 79. The LQI calculated by the reception state detection unit 78 of the receiver of the electronic device is transmitted to the remote controller together with the response.

  The channel selection signal SL2 generated by the control unit 79 controls the local oscillator 74, and, for example, a channel having a predetermined frequency that is less affected by the interference wave of the microwave oven is selected from a plurality of channels having different frequencies.

  The present invention is not limited to the above-described embodiment, and various modifications based on the technical idea of the present invention are possible. For example, a wireless method other than IEEE 802.15.4 may be used as a wireless communication method.

It is a block diagram which shows each structure of the remote controller and receiving module in one embodiment of this invention. It is a block diagram which shows each structure of the remote controller and receiving module in other embodiment of this invention. It is a basic diagram for demonstrating the environment where the remote control system by this invention is applied. It is a flowchart for demonstrating the authentication process of one embodiment of this invention. It is a block diagram which shows the structure of the transmission side for remote control. It is a block diagram which shows the structure of the receiving side for remote control.

Explanation of symbols

100, 200 ... Remote controller 102, 112, 202, 212 ... CPU
103, 113, 203, 213... Communication units 104, 114, 204, 214... Encryption (decryption) circuits 105, 115, 205, 215. 207 ··· Key input units 110, 210 ··· Reception modules 117, 217 ··· Communication interface

Claims (13)

In a remote control system in which a control instruction from a remote controller is wirelessly transmitted to a receiving device connected to an electronic device as a controlled device,
The remote controller includes a wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, a key input unit including an authentication code setting key, and a control unit.
The receiving device includes a wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, a display unit including one or a plurality of light emitting elements for presenting the authentication code, and an electronic device as a controlled device. An interface with the device and a control unit;
At the time of authentication setting, the receiving device generates an authentication code, and controls the lighting of the light emitting element of the display unit corresponding to the generated authentication code,
A remote control system in which an authentication code is set in the remote controller by operating the authentication code setting key corresponding to lighting of the light emitting element of the remote controller.   The remote control system according to claim 1, wherein the light emitting elements of the display unit are light emitting elements of a plurality of colors, and the authentication code setting key is the keys of the plurality of colors.   The remote control system according to claim 2, wherein the plurality of colors are associated with a value of one or more bits of the authentication code.   The remote control system according to claim 1, wherein processing for confirming that the authentication code set in the remote controller matches the authentication code generated by the receiving module is performed.   The remote control system according to claim 1, wherein an interface with the electronic device is infrared communication. In a remote control system in which a control instruction from a remote controller is wirelessly transmitted to a receiving device connected to an electronic device as a controlled device,
The remote controller includes a wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, a key input unit including a numeric key, and a control unit.
The receiving device includes a wireless communication unit, a storage unit that stores an authentication code, an encryption / decryption circuit, an interface with an electronic device as a controlled device including a display unit, and a control unit.
At the time of authentication setting, the reception device generates an authentication code, and controls to display the number of the authentication code on the display unit of the electronic device corresponding to the generated authentication code,
A remote control system in which an authentication code is set in the remote controller by operating the numeric keys of the remote controller with numbers corresponding to the numbers displayed on the display unit.   The remote control system according to claim 6, wherein the number of the authentication code is converted to a decimal number and associated with the one-digit number of the decimal number.   The remote control system according to claim 6, wherein processing for confirming that the authentication code set in the remote controller matches the authentication code generated by the receiving module is performed.   The remote control system according to claim 6, wherein an interface with the electronic device is infrared communication. In a remote control system receiver connected to an electronic device as a controlled device and wirelessly transmitting a control instruction from a remote controller,
A wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, a display unit including one or a plurality of light emitting elements for presenting the authentication code, an interface with an electronic device, a control unit, Have
A receiving device for a remote control system, which generates the authentication code when authentication is set, and presents the authentication code to the remote controller side by controlling lighting of the light emitting element of the display unit corresponding to the generated authentication code. In a remote control system receiver connected to an electronic device as a controlled device and wirelessly transmitting a control instruction from a remote controller,
A wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, an interface with an electronic device as a controlled device including a display unit, and a control unit,
When the authentication is set, the authentication code is generated, and the authentication code is displayed on the display unit of the electronic device corresponding to the generated authentication code, thereby presenting the authentication code to the remote controller. System receiver. In an electronic apparatus including a receiving device of a remote control system in which a control instruction from a remote controller is wirelessly transmitted to the receiving device,
The receiving device is
A wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, a display unit including one or a plurality of light emitting elements for presenting the authentication code, an interface with an electronic device, a control unit, Have
A receiver of a remote control system that generates the authentication code at the time of authentication setting and presents the authentication code to the remote controller side by controlling lighting of the light emitting element of the display unit corresponding to the generated authentication code. Electronic equipment provided. In an electronic apparatus including a receiving device of a remote control system in which a control instruction from a remote controller is wirelessly transmitted to the receiving device,
The receiving device is
A wireless communication unit, a storage unit for storing an authentication code, an encryption / decryption circuit, an interface with an electronic device as a controlled device including a display unit, and a control unit,
When the authentication is set, the authentication code is generated, and the authentication code is displayed on the display unit of the electronic device corresponding to the generated authentication code, thereby presenting the authentication code to the remote controller. An electronic device provided with a receiving device of the system.

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