JP7600571B2 - Wireless communication system, wireless receiving device, communication control method, and program - Google Patents

Description

The present invention relates to a wireless communication system , a wireless receiving device, a communication control method, and a program.

Wireless communication systems that transmit images and audio wirelessly have been put into practical use.

For example, a wireless communication system is known that includes a transmitting device that wirelessly transmits image and audio data output by an information processing device, and a receiving device that receives the wirelessly transmitted image and audio data and outputs it to a display device (see, for example, Patent Document 1).

In the wireless communication system described above, for example, even when an image is displayed on a display device based on image data that does not require encryption from an information processing device, the image data output from the receiving device to the display device may be encrypted. In such a case, in a conventional wireless communication system, even if the image data output from the information processing device is image data that does not require encryption, it is not possible to display the image based on the image data on a display device that does not support encryption.

One embodiment of the present invention has been made in consideration of the above problems, and provides a wireless communication system that can display an image based on image data even on a display device that does not support encryption, when the image data to be displayed is image data that does not require encryption.

In order to solve the above problem, a wireless communication system according to one embodiment of the present invention is a wireless communication system including a plurality of wireless transmitting devices connected to an information processing device that outputs image data, and a wireless receiving device connected to a display device that displays an image based on the image data and wirelessly connected to the wireless transmitting devices, wherein the wireless transmitting devices have a notification unit that notifies the information processing device that it is not compatible with encryption for protecting image data when connected to the information processing device, and a transmission unit that determines whether the image data output from the information processing device is encrypted based on the notification from the notification unit, and transmits the unencrypted image data to the wireless receiving device based on the determination result, the wireless receiving device has a receiving unit that receives the unencrypted image data transmitted from the transmission unit, and an output unit that outputs the unencrypted image data received from the receiving unit to the display device , the wireless transmitting devices have an operation receiving unit that accepts a connection operation to establish a wireless connection with the wireless receiving devices, and the wireless receiving device establishes the wireless connection with one of the plurality of wireless transmitting devices that last accepted the connection operation.

According to one embodiment of the present invention, when the image data to be displayed is image data that does not require encryption, it is possible to provide a wireless communication system that can display an image based on the image data even on a display device that does not support encryption.

1 is a diagram illustrating an example of a system configuration of a wireless communication system according to an embodiment. FIG. 2 is a diagram illustrating another example of a system configuration of a wireless communication system according to an embodiment. 1 is a diagram illustrating an example of a hardware configuration of a wireless transmitting device and a wireless receiving device according to an embodiment. FIG. 2 is a diagram illustrating an example of a hardware configuration of an information processing device according to an embodiment. FIG. 11 is a diagram illustrating another example of a hardware configuration of the information processing device according to an embodiment. FIG. 2 is a diagram illustrating an example of a hardware configuration of a display device according to an embodiment. FIG. 11 is a diagram illustrating another example of a hardware configuration of the display device according to an embodiment. FIG. 1 is a diagram showing an example of a functional configuration of a wireless communication system according to an embodiment; FIG. 2 is a diagram showing an example of a functional configuration of a wireless communication system according to an embodiment. 4 is a flowchart illustrating an example of processing of the wireless communication system according to the first embodiment. FIG. 1 is a sequence diagram (1) showing an example of processing of the wireless communication system according to the first embodiment. 6 is a flowchart illustrating an example of an image output process according to the first embodiment. 6 is a flowchart illustrating an example of a wireless connection process according to the first embodiment. FIG. 2 is a sequence diagram (2) showing an example of processing of the wireless communication system according to the first embodiment. 10 is a flowchart showing a flow of a communication control process according to a comparative example. FIG. 11 is a sequence diagram illustrating an example of processing performed by a wireless receiving device according to the second embodiment.

The following describes in detail an embodiment of the present invention with reference to the drawings.

<System Configuration>
1 is a diagram showing an example of a system configuration of a wireless communication system according to an embodiment. The wireless communication system 100 includes, for example, an information processing device 101 that outputs image data, a display device 102 that displays an image based on the image data, a wireless transmission device 110 connected to the information processing device 101, and a wireless reception device 120 connected to the display device 102.

The information processing device 101 may be, for example, a personal computer (PC), a tablet terminal, an information terminal such as a smartphone, or any of a variety of devices capable of outputting image data, such as a digital camera, a game console, or an information appliance. Here, the following description will be given assuming that the information processing device 101 is a PC, as an example.

The image data output by the information processing device 101 includes, for example, video data that transmits moving images and audio, or still image data that transmits still images.

The wireless transmitting device 110 is a wireless communication device that is connected to the information processing device 101 and transmits image data output from the information processing device 101 to the wireless receiving device 120 via a wireless signal 105.

As an example, the wireless transmission device 110 is connected to an HDMI (High-Definition Multimedia Interface) (registered trademark) terminal of the information processing device 101 via a cable 103 such as an HDMI cable. The wireless transmission device 110 may also be further connected to the information processing device 101 via a USB (Universal Serial Bus) cable for power supply, or the like.

As another example, the wireless transmission device 110 may be connected to a USB Type-C terminal of the information processing device via a cable 103 such as a USB Type-C cable.

Furthermore, the wireless transmission device 110 may be connected to an output terminal such as a DVI (Digital Visual Interface) terminal or a DisplayPort terminal provided on the information processing device 101. Here, as an example, the following description will be given assuming that the wireless transmission device 110 is connected to an HDMI terminal provided on the information processing device 101.

The wireless receiving device 120 is a wireless communication device that is connected to the display device 102, which displays images based on image data, and is wirelessly connected to the wireless transmitting device 110.

As an example, the wireless receiving device 120 is connected to an HDMI terminal provided on the display device 102 via a cable 104 such as an HDMI cable. The wireless receiving device 120 may also be further connected to the display device 102 via a USB cable for power supply.

As another example, the wireless receiving device 120 may be connected to a DVI terminal, a DisplayPort terminal, or the like, of the display device 102. Here, as an example, the following explanation will be given assuming that the wireless receiving device 120 is connected to an HDMI terminal of the display device 102.

The display device 102 includes various devices that display images based on image data input to an input terminal, such as an image projection device (projector) 102a, an interactive white board (IWB) 102b, and a display (monitor) 102c. Preferably, the display device 102 may also have a function of outputting audio included in the image data.

With the above configuration, a user can output images and sounds to the display device 102 simply by connecting the wireless transmitting device 110 to the information processing device 101 with a cable 103 and connecting the wireless receiving device 120 to the display device 102 with a cable 104. Such a wireless communication system 100 is called, for example, WPS (Wireless Presentation Solution).

In the example of FIG. 1, a user can cause the display device 102 to output images and audio based on image data output from the information processing device 101 simply by pressing the operation button 111 provided on the wireless transmission device 110.

The wireless communication system 100 may also include, for example, multiple wireless transmission devices 110a, 110b, 110c, ... as shown in FIG. 2. In FIG. 2, the display device 102 outputs images and sounds based on image data output by the information processing device 101a connected to the wireless transmission device 110a. In this state, when a user presses the operation button 111b provided on the wireless transmission device 110b, images and sounds based on the image data output by the information processing device 101b are output on the display device 102.

In such a wireless communication system 100, in the conventional technology, even when the information processing device 101 causes the display device 102 to display an image based on image data that does not require copyright protection, the image data output from the wireless receiving device 120 to the display device 102 is encrypted. For example, the wireless receiving device 120 outputs image data encrypted using HDCP (High-bandwidth Digital Content Protection) to the display device 102.

Therefore, in the conventional technology, even if the image data output from the information processing device 101 is image data that does not require copyright protection, there is a problem in that, for example, an image cannot be displayed based on the image data on a display device 102 that does not support HDCP encryption.

In this embodiment, in the wireless communication system 100 described above, if the image to be displayed is an image that does not require copyright protection, the image can be displayed even on a display device 102 that does not support encryption. This makes it possible to effectively use image projection devices 102a and electronic whiteboards 102b that do not support HDCP, which could not be used with conventional WPS, in the wireless communication system 100.

Note that HDCP is one example of an encryption method for encrypting image data. The encryption method for encrypting image data is not limited to HDCP, and may be another encryption method.

<Hardware Configuration>
Next, examples of the hardware configurations of the wireless transmitting device 110, the wireless receiving device 120, the information processing device 101, and the display device 102 will be described.

(Hardware configuration of wireless transmission device)
3 is a diagram showing an example of the hardware configuration of a wireless transmission device and a wireless reception device according to an embodiment. As shown in FIG. 3, the wireless transmission device 110 includes, for example, a CPU (Central Processing Unit) 301, a memory 302, a storage device 303, an external device connection I/F (Interface) 304, a wireless communication circuit 306, an antenna 306a for the wireless communication circuit, an operation button 111, and a bus 307.

The CPU 301 is a computing device (processor) that realizes various functions of the wireless transmission device 110 by executing a predetermined program. The memory 302 includes, for example, a RAM (Random Access Memory), which is a non-volatile memory used as a work area for the CPU 301, and a ROM (Read Only Memory) that stores in advance programs for starting up the CPU 301, etc. The storage device 303 is, for example, a large-capacity storage device such as a flash memory, an SSD (Solid State Drive), or an HDD (Hard Disk Drive).

The external device connection I/F 304 is, for example, an interface for connecting the wireless transmission device 110 to an output terminal of the information processing device 101. The external device connection I/F 304 includes, for example, terminals corresponding to HDMI, DVI, and DisplayPort, and an interface IC (Integrated Circuit), etc.

The wireless communication circuit 306 is a circuit that transmits and receives wireless signals to and from the wireless receiving device 120, and includes, for example, a wireless circuit and a communication control circuit. In this embodiment, the wireless communication method of the wireless communication circuit 306 is not particularly limited, but for example, a wireless LAN (Local Area Network) standard such as IEEE802.11 can be applied. In addition, the wireless communication circuit 306 may use a wireless communication method other than wireless LAN, such as UWB (Ultra Wide Band).

Operation button 111 is a button or the like for accepting wireless connection operations by the user. Bus 307 is connected to each of the above components and transmits, for example, address signals, data signals, and various control signals.

(Hardware configuration of wireless receiving device)
The wireless receiving device 120 has the same hardware configuration as the above-mentioned wireless transmitting device 110. However, the wireless receiving device 120 does not need to have (may have) the operation button 111. In addition, the external device connection I/F 304 of the wireless receiving device 120 is used, for example, to connect the wireless receiving device 120 to an input terminal of the display device 102.

Other than the above, the configuration of the wireless receiving device 120 may be the same as that of the wireless transmitting device 110, so a description thereof will be omitted here.

(Hardware configuration 1 of information processing device)
4 is a diagram showing an example of the hardware configuration of an information processing apparatus according to an embodiment. This diagram shows an example of the hardware configuration of a PC, which is an example of the information processing apparatus 101.

The information processing device 101 includes, for example, a CPU 401, a ROM 402, a RAM 403, a HD (Hard Disk) 404, a HDD controller 405, a display 406, an external device connection I/F 407, a network I/F 408, a keyboard 409, a pointing device 410, a DVD-RW (Digital Versatile Disk Rewritable) drive 412, a media I/F 414, a bus line 415, and an input/output terminal 420.

Of these, the CPU 401 controls the overall operation of the information processing device 101. The ROM 402 stores programs used to start up the information processing device 101, such as an IPL (Initial Program Loader). The RAM 403 is used, for example, as a work area for the CPU 401. The HD 404 stores various data, such as programs. The HDD controller 405 controls the reading and writing of various data from and to the HD 404 under the control of the CPU 401.

The display 406 displays various types of information, such as a cursor, a menu, a window, text, or an image. The external device connection I/F 407 is an interface for outputting image data from an input/output terminal 420. The input/output terminal (output terminal) 420 is a terminal (connector) such as HDMI, DVI, DisplayPort, or USB Type-C that outputs image data as a digital signal.

The network I/F 408 is an interface for data communication using a communication network. The keyboard 409 is a type of input means equipped with multiple keys for inputting characters, numbers, various instructions, etc. The pointing device 410 is a type of input means for selecting and executing various instructions, selecting a processing target, moving the cursor, etc.

The DVD-RW drive 412 controls the reading and writing of various data from the DVD-RW 411, which is an example of a removable recording medium. Note that the DVD-RW 411 is not limited to a DVD-RW, and may be other recording media. The media I/F 414 controls the reading and writing (storing) of data from the media 413, such as a flash memory or a memory card. The bus line 415 includes an address bus, a data bus, and various control signals for electrically connecting the above components.

(Hardware configuration 2 of information processing device)
5 is a diagram illustrating another example of the hardware configuration of the information processing device according to an embodiment. This diagram illustrates an example of the hardware configuration when the information processing device 101 is a mobile terminal such as a smartphone or a tablet terminal.

As shown in FIG. 5, the information processing device 101 includes a CPU 501, a ROM 502, a RAM 503, a storage device 504, a CMOS (Complementary Metal Oxide Semiconductor) sensor 505, an image sensor I/F 506, an acceleration/orientation sensor 507, a media I/F 509, a GPS (Global Positioning System) receiving unit 510, and the like.

Of these, the CPU 501 controls the operation of the entire information processing device 110 by executing a specific program. The ROM 502 stores programs used to start up the information processing device 101, such as IPL. The RAM 503 is used as a work area for the CPU 501. The storage device 504 is a large-capacity storage device that stores programs such as the OS and apps, and various data, and is realized by, for example, an SSD, flash ROM, etc.

The CMOS sensor 505 is a type of built-in imaging means that captures an image of a subject (mainly a self-portrait) under the control of the CPU 501 to obtain image data. Note that the information processing device 101 may have an imaging means such as a CCD (Charge Coupled Device) sensor instead of the CMOS sensor 505. The imaging element I/F 506 is a circuit that controls the driving of the CMOS sensor 505. The acceleration/direction sensor 507 is various sensors such as an electronic magnetic compass or gyrocompass that detects geomagnetism, and an acceleration sensor. The media I/F 509 controls the reading or writing (storage) of data to a media (storage media) 508 such as a flash memory. The GPS receiver 510 receives GPS signals from GPS satellites.

The information processing device 101 also includes a long-distance communication circuit 511, an antenna 511a of the long-distance communication circuit 511, a CMOS sensor 512, an image sensor I/F 513, a microphone 514, a speaker 515, an audio input/output I/F 516, a display 517, an external device connection I/F 518, a short-distance communication circuit 519, an antenna 519a of the short-distance communication circuit 519, and a touch panel 520.

Of these, the long-distance communication circuit 511 is a circuit that communicates with other devices, for example, via a communication network. The CMOS sensor 512 is a type of built-in imaging means that captures an image of a subject and obtains image data under the control of the CPU 501. The image sensor I/F 513 is a circuit that controls the operation of the CMOS sensor 512. The microphone 514 is a built-in circuit that converts sound into an electrical signal. The speaker 515 is a built-in circuit that converts electrical signals into physical vibrations to produce sounds such as music and voice. The audio input/output I/F 516 is a circuit that processes the input and output of audio signals between the microphone 514 and the speaker 515 under the control of the CPU 501.

The display 517 is a type of display means such as liquid crystal or organic EL (Electro Luminescence) that displays an image of a subject, various icons, etc. The external device connection I/F 518 is an interface for outputting image data from the input/output terminal 530. The input/output terminal (output terminal) 530 is a terminal (connector) such as HDMI, DVI, DisplayPort, USB Type-C, etc. that outputs image data as a digital signal.

The short-range communication circuit 519 is, for example, a circuit that performs short-range wireless communication. The touch panel 520 is a type of input means that allows the user to operate the information processing device 101 by pressing the display 517.

The information processing device 101 also includes a bus line 521. The bus line 521 includes an address bus, a data bus, and the like for electrically connecting the components such as the CPU 501 shown in FIG. 5.

(Display Device Hardware Configuration 1)
6 is a diagram illustrating an example of a hardware configuration of a display device according to an embodiment. Here, an example of the hardware configuration in the case where the display device 102 is an image projection device (projector) 102a will be described.

As shown in FIG. 6, the image projection device 102a includes, for example, a CPU 601, a ROM 602, a RAM 603, a media I/F 607, an operation unit 608, a power switch 609, a bus line 610, a network I/F 611, an LED (Light Emitting Diode) drive circuit 614, an LED light source 615, a projection device 616, a projection lens 617, an external device connection I/F 618, a fan drive circuit 619, a cooling fan 620, and an input/output terminal 621.

Of these, the CPU 601 controls the overall operation of the image projection device 102a. The ROM 602 stores programs used to start up the image projection device 102a. The RAM 603 is used as a work area for the CPU 601, etc.

The media I/F 607 controls the reading and writing (storing) of data from and to a recording medium 606 such as a flash memory. The operation unit 608 is provided with various keys, buttons, LEDs, etc., and is used by the user to perform various operations other than turning the power of the image projection device 102a on and off. For example, the operation unit 608 accepts instruction operations such as operations to adjust the size of the projected image, operations to adjust the color tone, operations to adjust the focus, operations to adjust the keystone, etc., and outputs the contents of the accepted operations to the CPU 601.

The power switch 609 is a switch for switching the power of the image projection device 102a on and off. The bus line 610 is an address bus, a data bus, etc. for electrically connecting each component such as the CPU 601 shown in FIG. 6. The network I/F 611 is an interface for data communication using a communication network such as the Internet.

The LED drive circuit 614 controls the turning on and off of the LED light source 615 under the control of the CPU 601. When the LED light source 615 is turned on under the control of the LED drive circuit 614, it irradiates the projection light to the projection device 616.

The projection device 616 modulates the projection light from the LED light source 615 using a spatial light modulation method based on image data provided via an external device connection I/F 618 or the like, and projects the modulated light obtained as an image onto the projection surface of the screen through a projection lens 617. As the projection device 616, for example, a liquid crystal panel or a DMD (Digital Micromirror Device) is used. The LED drive circuit 614, LED light source 615, projection device 616, and projection lens 617 function as a whole as a projection unit (projection means) that projects a projection image onto the projection surface based on image data.

The external device connection I/F 618 is an interface for acquiring image data input to an input/output terminal 621. The input/output terminal (input terminal) 621 is a terminal (connector) such as HDMI, DVI, DisplayPort, etc., that inputs image data as a digital signal.

The fan drive circuit 619 is connected to the CPU 601 and the cooling fan 620, and drives/stops the cooling fan 620 based on a control signal from the CPU 601. The cooling fan 620 rotates to exhaust air from inside the image projection device 102a, thereby cooling the inside of the image projection device 102a.

When power is supplied to the CPU 601, the CPU 601 starts up according to a control program prestored in the ROM 602, sends a control signal to the LED drive circuit 614 to turn on the LED light source 615, and sends a control signal to the fan drive circuit 619 to rotate the cooling fan 620 at a predetermined rated speed. When the image projection device 102a starts receiving power from the power supply circuit, the projection device 616 enters a state in which it can display images, and power is further supplied from the power supply circuit to various other components.

When the power switch 609 of the image projection device 102a is turned off, the power switch 609 sends a power-off signal to the CPU 601, and when the CPU 601 detects the power-off signal, it sends a control signal to the LED drive circuit 614 to turn off the LED light source 615. After a predetermined time has elapsed, the CPU 601 sends a control signal to the fan drive circuit 619 to stop the cooling fan 620, and ends its own control process, and finally sends an instruction to the power supply circuit to stop the supply of power from the power source.

(Display Device Hardware Configuration 2)
7 is a diagram illustrating another example of the hardware configuration of the display device according to an embodiment of the present invention. Here, an example of the hardware configuration in the case where the display device 102 is an electronic whiteboard 102b will be described.

As shown in FIG. 7, the electronic whiteboard 102b includes a CPU 701, a ROM 702, a RAM 703, an SSD 704, a network I/F 705, and an external device connection I/F 706.

Of these, the CPU 701 is a calculation device that controls the overall operation of the electronic whiteboard 102b. The ROM 702 is a non-volatile memory that stores programs used to start up the electronic whiteboard 102b, such as IPL. The RAM 703 is a volatile memory that is used as a work area for the CPU 701. The SSD 704 is a large-capacity storage device that stores various data such as programs for the electronic whiteboard 102b. The network I/F 705 is a communication interface that connects the electronic whiteboard 102b to a communication network and communicates.

The external device connection I/F 720 is an interface for acquiring image data input to an input/output terminal 721. The input/output terminal (input terminal) 721 is a terminal (connector) such as HDMI, DVI, DisplayPort, etc., that inputs image data as an image signal (digital signal).

The electronic whiteboard 102b also includes a capture device 711, a GPU (Graphics Processing Unit) 712, a display controller 713, a contact sensor 714, a sensor controller 715, an electronic pen controller 716, a short-range communication circuit 719, an antenna 719a for the short-range communication circuit, a power switch 717, and selection switches 718.

Of these, the capture device 711 captures (acquires) a display screen, etc. displayed on a display, etc. of the external PC 740, as a still image or video. The GPU 712 is a semiconductor chip (processor) that specializes in graphics. The display controller 713 controls and manages the screen display in order to output the output image from the GPU 712 to the display 750, etc. The contact sensor 714 detects that the electronic pen 730, the user's hand H, etc. has come into contact with the display 750. The sensor controller 715 controls the processing of the contact sensor 714.

The contact sensor 714, for example, inputs and detects coordinates using an infrared blocking method. This method of inputting and detecting coordinates involves two light receiving and emitting devices installed at both ends of the upper side of the display 750 emitting multiple infrared rays parallel to the display 750, and receiving the light that is reflected by a reflecting member installed around the periphery of the display 750 and returns along the same optical path as the light emitted by the light receiving element.

The contact sensor 714 outputs the ID of the infrared light emitted by the two light receiving and emitting devices that was blocked by the object to the sensor controller 715, and the sensor controller 715 identifies the coordinate position that is the contact position of the object. The electronic pen controller 716 communicates with the electronic pen 730 to determine whether the tip or the end of the pen has touched the display 750. The short-range communication circuit 719 is a communication circuit that performs short-range wireless communication via an antenna 719a.

The power switch 717 is a switch for switching the power of the electronic whiteboard 102b on and off. The selection switches 718 are, for example, a group of switches for adjusting the brightness and color of the display 750.

Furthermore, the electronic whiteboard 102b is provided with a bus line 760. The bus line 760 includes an address bus, a data bus, and various control signals for electrically connecting each component such as the CPU 701 shown in FIG. 7.

<Functional configuration>
8A and 8B are diagrams illustrating an example of a functional configuration of a wireless communication system according to an embodiment.

(Functional configuration of wireless transmission device)
3 executes a predetermined program, the wireless transmission device 110 realizes a notification unit 811, a transmission unit 812, a communication control unit 813, an operation reception unit 814, an encryption processing unit 815, etc. Note that at least a part of the above-mentioned functional configurations may be realized by hardware.

When the wireless transmission device 110 is connected to the information processing device 101, the notification unit 811 notifies the information processing device 101 that the wireless transmission device 110 does not support encryption (HDCP in this case) that protects image data.

Here, "when connected to the information processing device 101" includes not only when the wireless transmission device 110 is physically connected to the output terminal of the information processing device 101, but also when it is electrically or logically connected to the information processing device 101.

In addition, the notification unit 811 according to this embodiment notifies the information processing device 101 that the wireless transmission device 110, the display device 102, etc. are not compatible with HDCP, regardless of whether they are compatible with HDCP. This allows the information processing device 101 to output image data that requires copyright protection as an image signal (digital signal) encrypted with HDCP, and to output image data that does not require copyright protection as an image signal (digital signal) that is not encrypted with HDCP.

The transmission unit 812 transmits image data output from the information processing device 101 to the wireless receiving device 120 via a wireless signal, for example, using the wireless communication circuit 306 in FIG. 3.

For example, if the image data output from the information processing device 101 is not encrypted, the transmission unit 812 transmits the image data to the wireless receiving device 120 by wireless signal. Preferably, the transmission unit 812 compresses the image data output from the information processing device 101 and wirelessly transmits it to the wireless receiving device 120 together with information indicating that the image data output from the information processing device 101 is not encrypted (e.g., HDCP variable "0").

In addition, when the image data output from the information processing device 101 is encrypted, the transmission unit 812 transmits the decrypted image data to the wireless receiving device 120 via wireless communication. Preferably, the transmission unit 812 compresses the image data output from the information processing device 101 and wirelessly transmits the compressed image data to the wireless receiving device 120 together with information indicating that the image data output from the information processing device 101 is encrypted (e.g., HDCP variable "1").

Note that the HDCP variable is an example of information indicating whether or not the image data output from the information processing device 101 has been encrypted. The information indicating whether or not the image data output from the information processing device 101 has been encrypted is not limited to flag information such as the HDCP variable.

For example, if the image data output from the output terminal of the information processing device 101 is not encrypted, the transmission unit 812 may wirelessly transmit the image data without encryption, and if the image data is encrypted, the transmission unit 812 may wirelessly transmit the image data without compression, and if the image data is encrypted, the transmission unit 812 may wirelessly transmit the image data without compression, and if the image data is encrypted, the transmission unit 812 may wirelessly transmit the image data after decryption. Furthermore, if the image data output from the output terminal of the information processing device 101 is not encrypted, the transmission unit 812 may wirelessly transmit the image data over a first wireless channel, and if the image data is encrypted, the transmission unit 812 may wirelessly transmit the image data after decryption over a second wireless channel.

The communication control unit 813 controls wireless communication with the wireless receiving device 120 by the transmission unit 812. For example, when the operation reception unit 814 receives a connection operation for establishing a wireless connection with the wireless receiving device 120, the communication control unit 813 transmits a connection request signal to the wireless receiving device 120. Furthermore, when the wireless receiving device 120 allows the communication control unit 813 to connect, the communication control unit 813 establishes a wireless connection with the wireless receiving device 120 in a predetermined procedure. Furthermore, when the communication control unit 813 receives a disconnection request signal from the wireless receiving device 120, it disconnects or releases the wireless connection with the wireless receiving device 120.

The operation reception unit 814 receives a connection operation by the user. For example, the operation reception unit 814 detects that the operation button 111 provided on the wireless transmission device 110 has been pressed by the user, and notifies the communication control unit 813.

The encryption processing unit 815 has a function of encrypting image data, decrypting image data, or both. For example, the encryption processing unit 815 performs a process of encrypting image data using HDCP, and a process of decrypting image data encrypted using HDCP. The fact that the wireless transmission device 110 has the encryption processing unit 815 means that the wireless transmission device 110 has been certified as a device compatible with a specified encryption (in this embodiment, a device compatible with HDCP encryption).

(Functional configuration of information processing device)
The information processing apparatus 101 realizes an image output control unit 801 and an encryption processing unit 802 by, for example, executing a predetermined program in the CPU 401 in FIG. 4 (or the CPU 501 in FIG. 5).

The image output control unit 801 receives a notification from the notification unit 811 of the wireless transmission device 110 indicating that encryption for protecting images is not supported. Furthermore, when the image output control unit 801 receives this notification, it outputs unencrypted image data when outputting image data that does not require copyright protection. Furthermore, when the image output control unit 801 receives this notification, it outputs encrypted image data when outputting image data that requires copyright protection.

The encryption processing unit 802 has a function of encrypting image data, decrypting image data, or both. For example, the encryption processing unit 802 performs processing to encrypt image data output by the information processing device 101 using HDCP. The fact that the information processing device 101 has the encryption processing unit 802 means that the information processing device 101 has been certified as a device compatible with a specified encryption (in this embodiment, a device compatible with HDCP encryption).

(Functional configuration of wireless receiving device)
3 executes a predetermined program, the wireless receiving device 120 realizes a communication control unit 821, a receiving unit 822, an output unit 823, an encryption processing unit 824, etc. Note that at least a part of the above-mentioned functional configurations may be realized by hardware.

The communication control unit 821 controls wireless communication with the wireless transmission device 110 by the receiving unit 822. For example, when the communication control unit 821 receives a connection request signal from the wireless transmission device 110, it determines whether or not it is wirelessly connected to the other wireless transmission device 110. If it is not wirelessly connected to the other wireless transmission device 110, the communication control unit 821 permits wireless connection by the wireless transmission device 110 that transmitted the connection request signal, and establishes the wireless connection in a predetermined procedure. On the other hand, if it is wirelessly connected to the other wireless transmission device 110, for example, after disconnecting the wireless connection with the other wireless transmission device 110, it permits wireless connection by the wireless transmission device 110 that transmitted the connection request signal, and establishes the wireless connection in a predetermined procedure.

The receiver 822 receives a wireless signal transmitted from the wireless transmitter 110, for example, using the wireless communication circuit 306 in FIG. 3.

If the image data output from the information processing device 101 is not encrypted, this wireless signal includes the image data output from the information processing device 101. Preferably, this wireless signal includes information indicating that the image data output from the information processing device 101 is not encrypted (e.g., HDCP variable "0").

On the other hand, if the image data output from the information processing device 101 is encrypted, this wireless signal contains image data that has been decrypted from the image data output from the information processing device 101. Preferably, this wireless signal contains information indicating that the image data output from the information processing device 101 is encrypted (e.g., HDCP variable "1", etc.).

If the image data output from the information processing device 101 is not encrypted, the output unit 823 outputs the image data contained in the wireless signal to the display device 102.

On the other hand, if the image data output from the information processing device 101 is encrypted, the output unit 823 re-encrypts the image data contained in the wireless signal and outputs the resulting image data to the display device 102.

When the wireless signal includes an HDCP variable, the output unit 823 can recognize whether or not the image data output from the information processing device 101 is encrypted based on the HDCP variable.

The encryption processing unit 824 has a function of encrypting image data, decrypting image data, or both. For example, the encryption processing unit 824 performs processing to encrypt image data output by the wireless receiving device 120 using HDCP. The fact that the wireless receiving device 120 has the encryption processing unit 824 means that the wireless receiving device 120 has been certified as a device compatible with a specified encryption method (HDCP encryption in this embodiment).

(Functional configuration of the display device)
The display devices 102 include, for example, a display device 102x that supports encryption such as HDCP, and a display device 102y that does not support encryption such as HDCP.

The display device 102x, for example, realizes a display control unit 831 and an encryption processing unit 832 as shown in FIG. 8A by executing a predetermined program in the CPU 601 in FIG. 6 (or the CPU 701 in FIG. 7).

The display control unit 831 controls the display of an image based on image data output from the wireless receiving device 120. For example, the display control unit 831 displays an image based on image data that has been decrypted by the encryption processing unit 832 from the encrypted image data output from the wireless receiving device 120.

The encryption processing unit 832 decrypts the encrypted image data output from the wireless receiving device 120. For example, the encryption processing unit 832 decrypts the image data encrypted by HDCP output from the wireless receiving device 120. The fact that the display device 102 has the encryption processing unit 832 means that the display device 102 has been certified as a device compatible with a specified encryption (in this embodiment, a device compatible with HDCP encryption).

The display device 102y realizes a display control unit 831 as shown in FIG. 8B, for example, by executing a predetermined program in the CPU 601 in FIG. 6 (or the CPU 701 in FIG. 7).

The display control unit 831 controls the display of an image based on image data output from the wireless receiving device 120. For example, the display control unit 831 displays an image based on unencrypted image data output from the wireless receiving device 120. However, since the display device 102y does not have an encryption processing unit 832, if the image data output from the wireless receiving device 120 is encrypted, it cannot display an image based on the image data.

<Processing flow>
Next, the process flow of the communication control method according to this embodiment will be described.

[First embodiment]
(Processing Overview)
Fig. 9 is a flowchart showing an example of wireless communication system processing according to the first embodiment. This diagram shows an overview of processing executed by the wireless communication system 1 when displaying an image on the display device 102 based on image data output by the information processing device 101 in the wireless communication system 100 shown in Fig. 1, for example. Note that the following description will be given on the assumption that the encryption for protecting the image is HDCP. Also, the image data is output as an image signal (digital signal).

In step S901, the user connects the wireless transmitting device 110 (hereafter referred to as Tx) to the output terminal of the information processing device 101 via the cable 103, and connects the wireless receiving device 120 (hereafter referred to as Rx) to the input terminal of the display device 102 via the cable 104. As a result, power is supplied to Tx and Rx, and they start up.

In step S902, Tx and Rx each initialize the HDCP variable that they have internally and set it to "0."

In step S903, the Tx notification unit 811 notifies the device that it is not compatible with HDCP using the communication line of the cable 103 (e.g., an HDMI cable).

In step S904, the transmission unit 812 of Tx determines whether the image signal output from the information processing device 101 is HDCP compatible (whether it is encrypted by HDCP). If the image signal output from the information processing device 101 is HDCP compatible, the transmission unit 812 transitions the process to step S905. On the other hand, if the image signal output from the information processing device 101 is not HDCP compatible, the transmission unit 812 transitions the process to step S906.

When the process proceeds to step S905, the Tx transmission unit 812 sets the HDCP variable to "1" and obtains the image signal that has been decrypted by the encryption processing unit 815.

On the other hand, when the process proceeds to step S906, the Tx transmission unit 812 sets the HDCP variable to "0" and acquires the image signal output from the information processing device 101 as is.

In step S907, the transmission unit 812 of Tx transmits the acquired image signal and HDCP variables to Rx as a wireless signal. Preferably, the transmission unit 812 compresses and transmits the acquired image signal so that it can be transmitted as a wireless signal. In this way, the transmission unit 812 of Tx transmits the acquired image signal to the wireless receiving device 120 based on the result of the determination as to whether or not the image signal output from the information processing device 101 is encrypted.

In step S908, the receiver 822 of Rx receives the wireless signal transmitted from Tx and updates the HDCP variables on the Rx side with the HDCP variables contained in the wireless signal.

In step S909, the output unit 823 of Rx determines whether the HDCP variable on the Rx side is "1" (whether the image signal output by the information processing device 101 has been encrypted using HDCP). If the HDCP variable on the Rx side is "1", the output unit 823 transitions the process to step S910. On the other hand, if the HDCP variable on the Rx side is "0", the output unit 823 transitions the process to step S914.

When the process proceeds to step S910, the Rx output unit 823 encrypts the image signal contained in the wireless signal (the image signal obtained by decrypting the image signal output by the information processing device 101) using HDCP and outputs the encrypted image signal to the input terminal of the display device 102.

As a result, in steps S911 to S913, the display device 102x that supports HDCP has the encryption processing unit 832 and is therefore able to decrypt the encrypted image signal output from the wireless receiving device 120 and display the image. On the other hand, the display device 102y that does not support HDCP does not have the encryption processing unit 832 and is therefore unable to decrypt the encrypted image signal and is therefore unable to display the image.

On the other hand, when the process moves from step S909 to step S914, the Rx output unit 823 outputs the image signal contained in the wireless signal directly to the input terminal of the display device 102 without encrypting it using HDCP.

In step S915, the display control unit 831 of the display device 102 displays an image using the unencrypted image signal output from the wireless receiving device 120.

By performing the above process, the wireless communication system 100 is able to display images on a display device 102y that does not support HDCP if the image to be displayed does not require copyright protection.

(Processing 1 of wireless communication system)
10 is a sequence diagram (1) showing an example of processing of the wireless communication system according to the first embodiment. This processing shows an example of specific processing executed by the wireless communication system 1 when the image signal output by the information processing device 101 is an image signal that does not support HDCP.

In step S1001, when the user connects Rx (wireless receiving device 120) to the input terminal of the display device 102 via the cable 104, in step S1002, the output unit 823 of Rx initializes the HDCP variable held by Rx to "0".

In step S1003, when the user connects Tx (wireless transmission device 110) to the output terminal of the information processing device 101 via the cable 103, in step S1004, the notification unit 811 of Tx initializes the HDCP variable held by Tx to "0." Note that the processing of steps S1003 and S1004 may be performed before steps S1001 and S1002.

In step S1005, Tx and the information processing device 101 execute image output processing, for example, as shown in FIG. 11.

FIG. 11 is a flowchart showing an example of image output processing according to the first embodiment. This processing shows, for example, an example of image output processing executed in step S1005 of FIG. 10.

In step S1101, when Tx is connected to the output terminal of the information processing device 101 via an HDMI cable, the processing from step S1102 onwards is executed.

In step S1102, the supply of power (5V) from the output terminal of the information processing device 101 to Tx begins.

In step S1103, the Tx external device connection I/F 304 outputs an HPD (hot plug) signal (5V) to the output terminal of the information processing device 101.

In step S1104, a request is made from the output terminal of the information processing device 101 to Tx to obtain EDID (Extended Display Identification Data).

In step S1105, the Tx notification unit 811 notifies the information processing device 101 of the EDID and notifies that the Tx does not support HDCP.

In step S1006, the image output control unit 801 of the information processing device 101 determines whether the image signal to be output is HDCP compatible, and if it is HDCP compatible, the process proceeds to step S1107. On the other hand, if the image signal to be output is not HDCP compatible, the image output control unit 801 of the information processing device 101 proceeds to step S1108.

When the process proceeds to step S1107, the image output control unit 801 of the information processing device 101 outputs the HDCP-encrypted image signal 1 from the output terminal of the information processing device 101.

On the other hand, when the process proceeds to step S1108, the image output control unit 801 of the information processing device 101 outputs image signal 1 that is not encrypted by HDCP from the output terminal of the information processing device 101.

Now, let's return to Figure 10 and continue explaining the sequence diagram.

In step S1006, image signal 1 is output from information processing device 101 to Tx by the image output process of FIG. 5. Here, image signal 1 output by information processing device 101 is an image signal that does not support HDCP, so image signal 1 that is not encrypted by HDCP is output to TX.

In step S1007, the transmission unit 812 of Tx sets the HDCP variable held by Tx to "0" and acquires the image signal 1 output from the information processing device 101. Note that this process corresponds to the processes of steps S904 and S906 in FIG. 9.

In step S1008, when the user performs a wireless connection operation for Tx (e.g., pressing operation button 111), the processing from step S1009 onwards is executed.

In step S1009, Tx and Rx execute a wireless connection process, for example, as shown in FIG. 12.

FIG. 12 is a flowchart showing an example of wireless connection processing according to the first embodiment. This processing shows an example of wireless connection processing executed, for example, in step S1009 of FIG. 10.

In step S1201, when the Tx operation reception unit 814 receives a connection operation from the user, the processing from step S1202 onwards is executed.

In step S1202, the communication control unit 813 of Tx uses the transmission unit 812 to transmit a connection request signal requesting a wireless connection to Rx.

When the receiver 822 of Rx receives a connection request signal in step S1203, the communication control unit 821 of Rx determines in step S1204 whether Rx is wirelessly connected to another Tx. If Rx is wirelessly connected to another Tx, the communication control unit 821 transitions the process to step S1205. On the other hand, if Rx is not wirelessly connected to another Tx, the communication control unit 821 transitions the process to step S1206.

When the process proceeds to step S1205, the communication control unit 821 of Rx disconnects the wireless connection with another Tx that is currently wirelessly connected, and the process proceeds to step S1206.

When the process proceeds to step S1206, the communication control unit 821 of the Rx permits a wireless connection with the Tx that transmitted the connection request signal, and establishes a wireless connection according to a predetermined procedure. This enables the Tx to transmit an image signal to the Rx.

Now, let's return to Figure 10 and continue explaining the sequence diagram.

In step S1010, the transmitter 812 of Tx transmits the acquired image signal 1 and the HDCP variable "0" to Rx by wireless signal. Note that this process corresponds to the process of step S907 in FIG. 9.

In step S1011, when the receiving unit 822 of Rx receives the wireless signal transmitted from Tx, it sets the HDCP variable "0" contained in the wireless signal to the HDCP variable on the Rx side. Note that this process corresponds to the process of step S908 in FIG. 9.

In step S1012, since the HDCP variable on the Rx side is "0", the output unit 823 of Rx outputs the image signal 1 contained in the wireless signal to the input terminal of the display device 102. Note that this process corresponds to the processes of steps S909 and S914 in FIG. 9.

In step S1013, the display control unit 831 of the display device 102 displays an image using the unencrypted image signal 1 output from Rx.

By performing the above process, if the image to be displayed is not compatible with HDCP, the wireless communication system 100 is able to display the image even on a display device 102 that does not support HDCP.

(Processing 2 of wireless communication system)
Fig. 13 is a sequence diagram (2) showing an example of processing of the wireless communication system according to the first embodiment. This processing shows an example of specific processing executed by the wireless communication system 1 when the image signal output by the information processing device 101 is an image signal compatible with HDCP. Among the processing shown in Fig. 13, the processing of steps S1001 to S1005 is the same as the processing explained in Fig. 10, so here, differences from the processing explained in Fig. 10 will be mainly explained.

In step S1301, image signal 1 is output from the information processing device 101 to Tx by the image output process of FIG. 5. Here, since the image signal output by the information processing device 101 is an image signal compatible with HDCP, image signal 1 encrypted by HDCP is output to TX.

In step S1302, the transmission unit 812 of Tx sets the HDCP variable held by Tx to "1", and uses the encryption processing unit 815 to decrypt the image signal 1 output from the information processing device 101 to obtain the image signal 2. Note that this process corresponds to the processes of steps S904 and S905 in FIG. 9.

For example, in step S1303, when the user performs a wireless connection operation for Tx (e.g., pressing operation button 111), the processing from step S1304 onwards is executed.

In step S1304, Tx and Rx execute a wireless connection process, for example, as shown in FIG. 12.

In step S1305, the transmission unit 812 of Tx transmits image signal 2, which is the decrypted version of image signal 1, and the HDCP variable "1" to Rx via a wireless signal. Note that this process corresponds to the process of step S907 in FIG. 9.

In step S1306, when the receiver 822 of Rx receives the wireless signal transmitted from Tx, it sets the HDCP variable "1" contained in the wireless signal to the HDCP variable on the Rx side. Note that this process corresponds to the process of step S908 in FIG. 9.

In steps S1307 and S1308, the Rx output unit 823 uses the encryption processing unit 824 to encrypt the image signal 2 included in the wireless signal using HDCP to create an image signal 3, and outputs it to the input terminal of the display device 102. Note that this process corresponds to the process of step S910 in FIG. 9.

In step S1309, if the display device 102 is a display device 102x that supports HDCP, the encryption processing unit 832 of the display device 102x decrypts the image signal 3, and the display control unit 831 displays the decrypted image.

Note that if the display device 102 is a display device 102y that does not support HDCP, the display device 102y cannot display an image, but this is in accordance with the specifications of the wireless communication system 1.

Comparative Example
14 is a flowchart showing an example of processing of a wireless communication system according to a comparative example. This processing shows an example of processing of a wireless communication system according to a comparative example to which the present invention is not applied. Note that the system configuration of the wireless communication system according to the comparative example is assumed to be similar to the system configuration of the wireless communication system 1 according to the present embodiment described in FIG. 1, for example.

In step S1401, the user connects Tx to the output terminal of the information processing device 101 via a cable, and connects Rx to the input terminal of the display device 102 via a cable. This causes power to be supplied to Tx and Rx, and they start up.

In step S1402, Tx determines whether the image signal output from the information processing device 101 is HDCP compatible. If the image signal output from the information processing device 101 is HDCP compatible, Tx transitions the process to step S1403. On the other hand, if the image signal output from the information processing device 101 is not HDCP compatible, Tx transitions the process to step S1404.

When the process proceeds to step S1403, Tx acquires the decrypted image signal output from the information processing device 101.

On the other hand, when proceeding to step S1404, Tx acquires the image signal output from the information processing device 101 as is.

In step S1405, the Tx compresses the acquired image signal so that it can be transmitted, for example, as a wireless signal, and transmits it to the Rx.

In step S1406, Rx encrypts the image signal contained in the wireless signal using HDCP and outputs it to the input terminal of the display device 102.

As a result, in steps S1407 and S1408, the HDCP-compatible display device 102x decrypts the input image signal in the encryption processing unit 832, and the display control unit 831 displays the decrypted image. On the other hand, the display device 102y that does not support HDCP cannot decrypt the input image signal, and therefore cannot display the image.

As described above, in the wireless communication system according to the comparative example, the image signal output from Rx is always encrypted using HDCP, so even if the image signal to be displayed is an image signal that does not support HDCP, the image cannot be displayed on the display device 102y that does not support HDCP.

The Tx according to this embodiment has a function of notifying the information processing device 101 that the Tx is not compatible with HDCP, for example, in step S903 of FIG. 9. This allows the Tx to cause the information processing device 101 to output an image signal that is not encrypted with HDCP when the image signal to be displayed is an image signal that is not compatible with HDCP.

On the other hand, conventional wireless communication systems do not have this function, so even if the image signal to be displayed is an image signal that does not support HDCP, the information processing device 101 always outputs an image signal encrypted with HDCP.

In addition, in the wireless communication system 1 according to this embodiment, whether or not the image signal output by the information processing device 101 supports HDCP is managed by an HDCP variable. As a result, when the image signal output by the information processing device 101 does not support HDCP, i.e., when protection of the image signal is not required, the Rx can output an image signal that is not encrypted by HDCP to the display device 102.

As a result, according to the wireless communication system of this embodiment, if the image signal to be displayed is an image signal that does not require encryption, it is possible to provide a wireless communication system that can display the image signal even on a display device that does not support encryption.

The image signal is an example of image data output by the information processing device 101. Image data is converted into an image signal based on various standards and transmitted/received, and the received image signal is decoded into image data based on the standard and used. For example, when the input/output terminal 420 of the information processing device 101 is a terminal such as HDMI, DVI, DisplayPort, or USB Type-C, the image data is converted into an image signal (digital signal) and transmitted/received.

In addition, instead of the input/output terminal 420, the information processing device 101 may use, for example, a wireless communication interface to convert image data into an image signal (wireless signal) and transmit/receive the image data.

Second Embodiment
In the second embodiment, as shown in Fig. 2, an example of processing will be described in the case where a wireless communication system 100 includes a plurality of wireless transmission devices 110a and 110b. Note that since the processing on the wireless transmission device 110 side is similar to that of the first embodiment, the processing on the wireless reception device 120 side will be mainly described here.

At the start of the process shown in FIG. 15, it is assumed that the information processing device 101a is connected to the wireless transmission device 110a and that, for example, the processes of steps S1003 to S1302 in FIG. 13 have been executed. It is also assumed that the information processing device 101b is connected to the wireless transmission device 110b and that, for example, the processes of steps S1003 to 1007 in FIG. 10 have been executed.

In step S1501, the operation reception unit 814 of the wireless transmission device 110a receives a wireless connection operation by the user.

In step S1502, in response to receiving the wireless connection operation, the communication control unit 813 of the wireless transmitting device 110a transmits a connection request signal to the wireless receiving device 120 using the transmitting unit 812.

In step S1503, since the communication control unit 821 of the wireless receiving device 120 is not wirelessly connected to another wireless transmitting device 110, the communication control unit 821 permits the wireless connection of the wireless transmitting device 110a and establishes a wireless connection.

In step S1504, the transmission unit 812 of the wireless transmission device 110a transmits to the wireless reception device 120 a wireless signal including the image signal 2 obtained by decrypting the image signal 1 output by the information processing device 101 and the HDCP variable "1".

In step S1506, when the receiving unit 822 of the wireless receiving device 120 receives the wireless signal transmitted from the wireless transmitting device 110a, it sets the HDCP variable "1" contained in the wireless signal to the HDCP variable on the Rx side.

In steps S1507 and S1508, the output unit 823 of the wireless receiving device 120 creates an image signal 3 by encrypting the image signal 2 contained in the wireless signal using HDCP, and outputs the image signal 3 to the input terminal of the display device 102.

In step S1509, for example, a display device 102y that is not compatible with HDCP and is installed in a conference room or the like cannot display images of meeting materials encrypted with HDCP.

In such a case, for example, if the information processing device 101b has conference materials that are not compatible with HDCP, the processing from step S1510 onwards can cause the conference materials to be displayed on the display device 102y.

In step S1510, the operation reception unit 814 of the wireless transmission device 110b receives a wireless connection operation by the user.

In step S1511, in response to receiving the wireless connection operation, the communication control unit 813 of the wireless transmitting device 110b uses the transmitting unit 812 to transmit a connection request signal to the wireless receiving device 120.

In step S1512, the communication control unit 821 of the wireless receiving device 120 disconnects the wireless connection with the wireless transmitting device 110a because the wireless receiving device 120 is currently wirelessly connected to the other wireless transmitting device 110a. Note that this process corresponds to, for example, the processes of steps S1204 and S1205 in FIG. 12.

In step S1513, the communication control unit 821 of the wireless receiving device 120 permits a wireless connection with the wireless transmitting device 110b and establishes a wireless connection.

In step S1514, the transmission unit 812 of the wireless transmission device 110b transmits a wireless signal including the image signal 1 output by the information processing device 101 and the HDCP variable "0" to the wireless reception device 120.

In step S1515, when the receiver 822 of the wireless receiving device 120 receives the wireless signal transmitted from the wireless transmitting device 110b, it sets the HDCP variable "0" contained in the wireless signal to the HDCP variable on the Rx side.

In step S1516, the output unit 823 of the wireless receiving device 120 outputs the image signal 1 contained in the wireless signal to the input terminal of the display device 102.

In step S1517, the display control unit 831 of the display device 102 displays an image using the unencrypted image signal 1 output from the wireless receiving device 120.

In this way, according to the wireless communication system 100 of this embodiment, even if, for example, a conference room or the like only has a display device 102 that does not support HDCP, it is possible to effectively utilize the display device 102 that does not support HDCP by using conference materials that do not require copyright protection.

<Additional Information>
Each function of each embodiment described above can be realized by one or more processing circuits. Here, the term "processing circuit" in this specification includes a processor programmed to execute each function by software, such as a processor implemented by an electronic circuit, and devices such as an ASIC (Application Specific Integrated Circuit), a DSP (digital signal processor), an FPGA (field programmable gate array), and a conventional circuit module designed to execute each function described above.

100 Wireless communication system 101 Information processing device 102, 102x, 102y Display device 110 Wireless transmission device 120 Wireless reception device 420, 530 Input/output terminal (output terminal)
811 Notification unit 812 Transmission unit 814 Operation reception unit 822 Reception unit 823 Output unit

U.S. Pat. No. 9,722,986

Claims (11)

A wireless communication system including a plurality of wireless transmission devices connected to an information processing device that outputs image data, and a wireless reception device connected to a display device that displays an image based on the image data and wirelessly connected to the wireless transmission devices,
The wireless transmission device includes:
a notification unit that notifies the information processing device that the information processing device does not support encryption for protecting image data when the information processing device is connected;
a transmission unit that determines whether the image data output from the information processing device is encrypted based on the notification from the notification unit, and transmits the unencrypted image data to the wireless receiving device based on a result of the determination;
having
The wireless receiving device includes:
a receiving unit that receives the unencrypted image data transmitted from the transmitting unit;
an output unit that outputs the unencrypted image data received from the receiving unit to the display device;
having
the wireless transmission device has an operation receiving unit that receives a connection operation for establishing a wireless connection with the wireless reception device;
the wireless receiving device establishes the wireless connection with one of the plurality of wireless transmitting devices that has lastly accepted the connection operation;
Wireless communication system. the transmitting unit transmits decrypted image data of the encrypted image data to the wireless receiving device based on the result of the determination;
When the receiving unit receives image data obtained by decrypting the encrypted image data transmitted from the transmitting unit,
The wireless communication system according to claim 1 , wherein the output unit outputs image data obtained by encrypting the decrypted image data to the display device. The wireless communication system according to claim 1 or 2, wherein the transmission unit transmits information indicating whether the image data output from the information processing device is encrypted to the wireless receiving device. 4. The wireless communication system according to claim 1 , wherein the encryption is HDCP (registered trademark). 5. The wireless communication system according to claim 4 , wherein the wireless transmission device is connected to an HDCP-compatible HDMI terminal, a DVI terminal, a DisplayPort terminal, or a USB Type-C terminal provided in the information processing device. The wireless communication system according to claim 1 , further comprising the display device. A wireless receiving device that is wirelessly connected to a wireless transmitting device that is connected to an information processing device that outputs image data, and is connected to a display device that displays an image based on the image data,
a receiving unit that receives unencrypted image data transmitted from the wireless transmitting device and information indicating that the image data output from the information processing device is unencrypted;
an output unit that outputs the unencrypted image data received from the receiving unit to the display device;
having
the wireless transmission device has an operation receiving unit that receives a connection operation for establishing a wireless connection with the wireless reception device;
When there are a plurality of the wireless transmission devices, the wireless reception device establishes the wireless connection with one of the wireless transmission devices that has lastly accepted the connection operation.
Radio receiving device. When the receiving unit receives image data obtained by decrypting the encrypted image data transmitted from the wireless transmission device and information indicating that the image data output from the information processing device is encrypted,
The wireless receiving device according to claim 7 , wherein the output unit outputs image data obtained by encrypting the decrypted image data received from the receiving unit to the display device. A communication control method in a wireless communication system including a plurality of wireless transmission devices connected to an information processing device that outputs image data, and a wireless reception device that is connected to a display device that displays an image based on the image data and is wirelessly connected to the wireless transmission devices, comprising:
The wireless transmission device,
a process of notifying the information processing device that the information processing device does not support encryption for protecting image data when the information processing device is connected;
a process of determining whether the image data output from the information processing device is encrypted based on the notification, and transmitting the unencrypted image data to the wireless receiving device based on a result of the determination;
Run
The wireless receiving device,
receiving the unencrypted image data transmitted from the wireless transmission device;
outputting the unencrypted image data to the display device;
Run
the wireless transmitting device accepts a connection operation for establishing a wireless connection with the wireless receiving device;
the wireless receiving device establishes the wireless connection with one of the plurality of wireless transmitting devices that has lastly accepted the connection operation;
Communications control method. A program for causing a wireless transmitting device and a wireless receiving device to execute the communication control method according to claim 9 . A wireless receiving device is connected to a wireless transmitting device that is connected to an information processing device that outputs image data, and is connected to a display device that displays an image based on the image data.
receiving unencrypted image data transmitted from the wireless transmission device and information indicating that the image data output from the information processing device is unencrypted;
outputting the received unencrypted image data to the display device;
Run the command ,
the wireless transmission device has an operation receiving unit that receives a connection operation for establishing a wireless connection with the wireless reception device;
A program that, when the wireless receiving device has a plurality of the wireless transmitting devices, further executes a process of establishing the wireless connection with one of the plurality of the wireless transmitting devices that last accepted the connection operation .

Images