JP4642374B2 - Control data communication apparatus in wireless AV system - Google Patents

Description

  The present invention relates to a wireless control system, a control device, a controlled device, a control method of the device, a control program, and a computer reading recording the same, comprising a control device and a controlled device controlled wirelessly by the control device The present invention relates to a possible recording medium.

  In recent years, with the explosive spread of the Internet, cases where a LAN (Local Area Network) is constructed in offices, homes, and the like are increasing.

  Advances in digital wireless communication technology have also helped, and the need for a so-called wireless LAN for building a wireless LAN has increased greatly due to the inconvenience of cabling. In addition, the wireless communication devices that make up such a wireless LAN can be used in a mobile environment such as a laptop computer, and in the future, a considerable number of devices will be used. Is expected.

  As a typical technology of this wireless LAN, there is IEEE 802.11 which has already been standardized by the Institute of Electrical and Electronics Engineers (IEEE). This standardized technology defines from the physical layer to the MAC (Media Access Control) layer, which is the lower layer of the data link, in the OSI model, and is a wired LAN transmission path, Ethernet ( In addition, it is a specification that can provide a roaming function as an additional function because it is wireless.

  In recent years, wireless AV systems using such a wireless LAN have been proposed in order to exchange video image data and audio data wirelessly.

  Generally, in a wireless AV system, degradation of video image data to be transmitted / received becomes a problem due to a transmission error.

Therefore, in Patent Document 1, a transmission error is detected by an image header included in the video image data, and when the transmission error is detected, the video image data is temporarily stored, and a repetition of a header different from the image header is performed. An image decoding method has been proposed in which video image data that has been detected and temporarily stored is decoded based on the repeated header to prevent deterioration of the video image data.
PCT International Publication Number: WO 01/006795 (published on January 25, 2001)

  By the way, in the conventional wireless AV system, when a plurality of controlled devices (video deck, DVD player, stereo, television, etc.) are controlled from one control device (AV amplifier or the like), each controlled device is controlled from the control device. Control data was transmitted wirelessly toward That is, in the control device, the control data is distributed and transmitted to each controlled device in the data transmission / reception unit of the control device.

  For this reason, as the number of controlled devices to be controlled by one control device increases, the processing amount for control data distribution in the data transmission / reception unit in the control device, that is, the processing amount for control data identification increases. As a result, the control device cannot quickly control the controlled device, which causes a problem that the entire wireless AV system does not operate smoothly.

  The present invention has been made in view of the above problems, and its purpose is to increase the amount of processing for control data identification on the control device side even if the number of controlled devices to be controlled by the control device increases. The object is to realize a wireless control system that can smoothly operate the entire wireless AV system.

  As a result of diligent research in view of the above problems, the present inventors have conceived that a specific key code is used as a header and the data body is converted and transmitted so that a specific key code does not appear.

  That is, the present invention is an apparatus for transmitting and receiving control data between AV devices constituting a wireless AV system, wherein the means for generating control data, the means for converting the generated control data, and the converted control The present invention provides an apparatus comprising means for wirelessly transmitting and receiving data and means for identifying the converted control data and acquiring data before conversion.

  In the present invention, the means for converting the control data adds a key code for identifying the control data to the head of the control data, and data having the same content as the key code is stored in the other part of the control data. In some cases, a certain conversion is performed on the data.

  In addition, the control data of the present invention includes data for the AV device constituting the wireless AV system to control the wireless communication station in its own device, and the wireless communication station in the AV device other than its own device. It includes data to be controlled and data to control an AV device other than its own device.

  Furthermore, the control data of the present invention includes a command for changing a data transmission rate, changing a wireless communication channel, changing a tuner channel, and switching an input.

  As described above, according to the wireless AV system of the present invention, when transmitting / receiving control data between AV devices, the control data is identified according to the key code added to the header without having to process the data body. Therefore, it is possible to reduce the load of data identification work in the radio station and the terminal.

  An embodiment of the present invention will be described as follows. In the present embodiment, an example in which the wireless control system of the present invention is applied to a wireless AV (audio visual) system will be described.

  FIG. 1 is a schematic block diagram showing an overview of a wireless AV system 101 according to the present embodiment. Here, an example is shown in which the wireless AV system 101 is applied to a display-separated wireless TV receiver as shown in FIG.

  That is, the wireless AV system 101 includes a TV main unit 103 and a wireless center unit 102 as shown in FIG.

  The TV main unit 103 includes a wireless TV receiver with a built-in battery, and includes a remote controller (hereinafter referred to as a remote controller) 130 and is connected to the wireless center unit 102 via the TV main unit 103. Remote control operation of the video deck etc. that can be done.

  The wireless center unit 102 is connected to an antenna such as a BS or U / VHF, an AV device such as a DVD player or a video deck, and the TV main unit receives video and / or audio data from the AV device. 103 is transmitted wirelessly.

  Details of the wireless AV system 101 will be described below. Further, in the following description, when “data” is simply described, it indicates all data transmitted and received in the general wireless AV system 101 such as control data, video data, and audio data.

  As shown in FIG. 1, the wireless AV system 101 includes a wireless center unit 102 as a base device and a television (TV) main unit 103 as a portable terminal. The wireless center unit 102 and the TV main unit 103 constitute a wireless transmission network 1 as a pair.

  The wireless center unit 102 and the TV main unit 103 have functions of both a control device and a controlled device. That is, when the wireless center unit 102 functions as a control device, the TV main unit 103 functions as a controlled device, and when the TV main unit 103 functions as a control device, the wireless center unit 102 functions as a controlled device.

  Here, in the wireless transmission network 1, data is transmitted and received between the wireless center unit 102 and the TV main unit 103 by an SS (Spread Spectrum) wireless system compliant with the IEEE 802.11 standard. To do.

  The wireless center unit 102 has a BS 1 (broadcasting satellite) terminal 11, a U / VHF antenna terminal 12, a diversity terminal 13, and a video 1 input terminal with an S terminal for connecting devices such as a digital VTR and a DVD player ( External input 1) 14, video 2 input terminal (external input 2) 15 for decoder input, video 3 input terminal (external input 3) 16 for monitor / BS output, AC power supply unit 17 as a power supply device, and Car-DC A power supply unit 18 is provided.

  Details of the wireless center unit 102 will be described later.

  The TV main unit 103 includes a TV output video 4 input terminal (external input 4) 21 for connecting devices such as a digital VTR and a DVD (Digital Versatile Disc) player, an AC power supply unit 22 as a power supply device, and a Car-DC. A power supply terminal (not shown) for connection to the power supply unit 23 is provided.

  The TV main unit 103 is a thin display device that is separable from the wireless center unit 102 and is portable or portable with a built-in battery. For example, a liquid crystal television (hereinafter referred to as a liquid crystal television), an inorganic EL (Electroluminescence) / organic This is a broad concept including various display devices such as an EL display and a plasma display, and is not limited by the display mechanism.

  The details of the TV main unit 103 will be described later.

  In the present embodiment, the TV main unit 103 mainly has a display function, an acoustic function, and the like, while the wireless center unit 102 mainly has a control function for controlling the tuner unit and the TV main unit 103. is doing. In the present embodiment, the TV main unit 103 will be described using a liquid crystal television as an example of a thin display device. For example, a system as shown in FIG. 13 can be considered. A description of FIG. 13 will be given later.

  In the wireless transmission network 1 formed between the wireless center unit 102 and the TV main unit 103, data is transmitted and received by the SS wireless method as described above. Here, the 2.4 GHz band is used as the frequency band. In addition, since the 5 GHz band has recently been released as a frequency band, the 5 GHz band may be used instead of the 2.4 GHz band.

  From the wireless center unit 102 to the TV main unit 103, moving picture data, DVD-Video data, and digital broadcast data are transmitted over a communication line exceeding 10 Mbps using a video compression format of MPEG (Moving Picture Expert Group) 2. . Further, command (control signal) transmission between the wireless center unit 102 and the TV main unit 103 is also performed by the above SS radio system.

  Here, MPEG will be described.

  When applying to an actual application including MPEG video and MPEG audio encoded streams (bit strings) and other encoded streams, the encoded streams are multiplexed and integrated into a single unit including synchronization. At the same time, it is necessary to make the stream a data format conforming to a specific physical format or protocol possessed by the storage medium or network.

  The MPEG2 system includes a program stream (MPEG2-PS, PS: Program Stream) that constitutes one program, and a transport stream (MPEG2-TS, TS: Transport Stream) that can constitute a plurality of programs, as in MPEG1. There is.

  The MPEG stream is a byte stream that is byte-aligned for each unit such as a header although there are many 1-bit flags. As a structure common to the entire MPEG system, the data portion that is not fixed length is preceded by information indicating the length. If unnecessary, that portion is skipped or the head of the next data group is confirmed and trusted. It has a data structure that enables highly-separated separation processing.

  An apparatus for receiving compressed video and audio signals in conformity with the MPEG2 encoding system is designed to receive video and audio sampling frequencies on the encoding side in order to prevent overflow and underflow of video and audio data on the decoding side. And the video, audio sampling frequency or STC (System Time Clock) on the decoding side must be matched.

  Therefore, the decoding apparatus uses PCR (Program Clock Reference) or SCR (System Clock Reference) defined by the MPEG2 system standard (ISO / IEC standard 13818-1). Thus, the video and audio sampling frequencies on the encoding side are matched with the video and audio sampling frequencies on the decoding side.

  Here, details of the wireless center unit 102 and the TV main unit 103 of the wireless AV system 101 configured as described above will be described below with reference to FIGS.

  FIG. 2 is a block diagram showing an outline of the wireless center unit 102, and FIG. 3 is a block diagram showing an outline of the TV main unit 103.

  As shown in FIG. 2, the wireless center unit 102 transmits the data from the wireless center 2 and the data from the wireless center 2 to the TV main unit 103 (see FIG. 1) by the SS radio system, and from the TV main unit 103. It is comprised with SS transmission / reception unit 36 as a communication means (communication part) which receives this command (control command).

  The wireless center 2 is connected to the BS terminal 11 and receives and selects a BS broadcast using a channel selection signal. The wireless center 2 is connected to the U / VHF antenna terminal 12 and receives and selects a U / VHF broadcast using a channel selection signal. A U / VHF tuner 32, a video / audio demodulator 33 that demodulates a video / audio (AV) signal received and selected by the BS tuner 31 or the U / VHF tuner 32, and audio received by the audio switching signal An audio switching unit 34 for switching information related to a program such as an EPG (Electrical Program Guide), video / audio information received by a source selection signal, information related to a program, a video 1 input terminal 14, a video 2 input terminal ( A first AV selector 35 for selecting external input information from a decoder input 15, a video 3 input terminal (for both monitor / BS output) 16; A wireless center microcomputer 37 for controlling each unit, and an electrically rewritable nonvolatile memory for storing various data such as a control program, communication control data, and a communication channel change program for the wireless center microcomputer 37 An EEPROM (electrically erasable programmable ROM) 38 is provided.

  The wireless center microcomputer 37 transmits a channel selection signal 41 to the BS tuner 31 and the U / VHF tuner 32, transmits an audio switching signal 42 to the audio switching unit 34, and transmits to the first AV selector 35. A source selection signal 43 is transmitted, and a TV command 44 is transmitted / received to / from the SS transmission / reception unit 36.

  The wireless center microcomputer 37 includes a control data generation unit that generates control data to be described later, an identification unit for identifying a controlled device from an identification code included in the control data, and control data to the identified controlled device. It also functions as a control data transmission unit for transmission.

  The channel selection signal 41 is a signal including information for designating a TV program channel. The voice switching signal 42 is a signal including information for switching voices such as main voice, sub voice, stereo, and monaural. Further, the source selection signal 43 is an audio / video signal from an external device such as the video 1 input terminal 14 to the video 3 input terminal 16 or an audio / video signal received by the BS tuner 31 and the U / VHF tuner 32. Is a signal including information for selecting.

  That is, the BS tuner 31 and the U / VHF tuner 32 receive the broadcast of the program channel specified by the channel selection signal 41 from the wireless center microcomputer 37.

  The audio switching unit 34 switches the audio output from the video / audio demodulating unit 33 to the audio designated by the audio switching signal 42 from the wireless center microcomputer 37.

  Further, the first AV selector 35 is a source specified by a source selection signal 43 from the wireless center microcomputer 37 (video / audio signal from an external device such as the video 1 input terminal 14, BS tuner 31, and U / VHF tuner). Video / audio signal from 32) is selected.

  The TV command 44 is a control signal that is transmitted and received between the wireless center microcomputer 37 and the SS transmission / reception unit 36 to control the entire apparatus.

  That is, the TV command 44 is generated by the wireless center microcomputer 37, transmitted to the SS transmission / reception unit 36, and further transmitted to the TV body unit 103 which is a communication partner device of the SS transmission / reception unit 36. On the contrary, in the wireless center unit 102, the TV command 71 (see FIG. 3) is received by the wireless center microcomputer 37 from the TV body unit 103 which is a communication partner via the SS transmission / reception unit 36.

  As a result, the TV main unit 103 receives the TV command 44 from the wireless center unit 102 which is the communication partner, thereby controlling each part of the TV main unit 103. By receiving a TV command 71 (see FIG. 3) from the main unit 103, each part of the wireless center unit 102 is controlled.

  In the present embodiment, the wireless center 2 is provided with a BS tuner 31 and a U / VHF tuner 32 as broadcast tuners. However, these are tuners that receive analog broadcasts. It may be a tuner that receives a digital broadcast. Also, the digital broadcast tuner may be a satellite digital broadcast tuner or a terrestrial digital broadcast tuner.

  The SS transmission / reception unit 36 converts the data selected by the first AV selector 35 in the wireless center 2 into a digital signal, and the A / D conversion unit 51 converts the data into a digital signal. An MPEG2 encoder 52 for converting the received data into an MPEG2 video compression format, an SS radio transceiver engine 53 for transmitting transmission data (MPEG2 stream, command, etc.) by the SS radio system and a radio control unit, and an SS transmission unit The first SS-CPU 54 is configured to control each unit and detect a radio wave state.

  The SS wireless transmission / reception engine 53 includes a transmission function for transmitting commands such as MPEG2 streams such as video and / or audio data and control data to an SS transmission / reception unit 61 (described later in FIG. 3) of the TV main unit 103, and an SS. And a receiving function for receiving a command such as control data from the transmission / reception unit 61.

  In the present embodiment, since the program for controlling the wireless center unit 102 is recorded in the EEPROM 38 so as to be rewritable, the contents of control can be easily changed by rewriting the program. As described above, the wireless center unit 102 stores the information in the rewritable memory in order to avoid the time loss of changing the mask ROM for each debugging of the system development. That is, the program ROM is a non-volatile memory, for example, EPROM or EEPROM, so that the program development / modification time can be greatly shortened. Further, if the program is downloaded and the program content of the EEPROM 38 is rewritten, it is possible to easily upgrade the function or change the function.

  Next, details of the TV main unit 103 will be described below with reference to FIG.

  As shown in FIG. 3, the TV main unit 103 transmits the TV main unit 3 and a command from the TV main unit 3 to the wireless center unit 102 (see FIG. 1) by the SS wireless method, and from the wireless center unit 102. And an SS transmission / reception unit 61 as communication means for receiving the data.

  The SS transmission / reception unit 61 transmits / receives the TV command 71 to receive the MPEG2 stream and command transmission data transmitted from the SS transmission / reception unit 36 of the wireless center unit 102, and decodes (restores) the received MPEG2 stream to the original data. ). Details of the SS transmission / reception unit 61 will be described later.

  The TV main body 3 displays a video signal and a second AV selector 62 that selects data restored by the SS transmission / reception unit 61 and an AV signal input from the outside via the video 4 input terminal 21 for TV output. In addition to transmitting / receiving TV commands 71 to / from a TV unit 63 (part of the notification means), which includes an LCD or the like that outputs audio signals, a source selection signal 72, an OSD (on-screen display) signal 73, and the like are transmitted. An electrically rewritable nonvolatile memory for storing various data such as a TV microcomputer 64 (part of the notification means) for controlling the entire apparatus, a control program for the TV microcomputer 64, communication control data, and a communication channel change program. A control command from an EEPROM 65 as a memory and a remote control device (not shown) (hereinafter referred to as a remote control device). Remote control light-receiving unit 66 for receiving a signal, battery 67, battery charger microcomputer 68 for controlling charging / discharging of battery 67, video signal output from second AV selector 62, and OSD output from TV microcomputer 64 An OSD synthesizing unit 69 for synthesizing the signal 73 and outputting it to the TV unit 63 is provided.

  The TV microcomputer 64 includes a control data generation unit for generating control data, which will be described later, an identification unit for identifying a controlled device from an identification code included in the control data, and a control for transmitting control data to the identified controlled device It also functions as a data transmission unit.

  The SS transceiver unit 61 includes an SS radio transceiver engine 81 comprising an SS radio and a radio controller for receiving data transmitted by the SS radio system, an MPEG2 decoder 82 for decoding the received MPEG2 stream, and an analog of the decoded data. The D / A converter 83 that converts the signal and each part of the SS transmission / reception unit are controlled, and the second SS-CPU 84 (communication state detecting means) that detects the radio wave state is provided.

  The SS radio transmission / reception engine 81 has a reception function for receiving an MPEG2 stream, a command, and the like from the SS transmission / reception unit 36 of the wireless center unit 102, and a transmission function for transmitting a command and the like from the SS transmission / reception unit 61.

  In particular, the second SS-CPU 84 detects the communication state (the strength of the radio waves, the jamming of the communication path) between the wireless center unit 102 and the TV main unit 103 by a retransmission request based on the electric field strength and error rate of the received radio waves. A function as a radio wave state detection means is provided. Information indicating the detected radio wave state is sent to the TV microcomputer 64 as a TV command 71.

  In the present embodiment, the configuration in which the second SS-CPU 84 in the SS transmission / reception unit 61 of the TV main unit 103 includes the above-described radio wave state detection function is shown. However, the first SS in the SS transmission / reception unit 36 of the wireless center unit 102 is shown. The SS-CPU 54 may have a similar function, and a command may be transmitted from the wireless center unit 102 to the TV main unit 103 with information indicating the detected radio wave state. Alternatively, both the first SS-CPU 54 and the second SS-CPU 84 may have a radio wave state detection function. Furthermore, the aspect which the TV microcomputer 64 or the wireless center microcomputer 37 performs the said electromagnetic wave state detection function may be sufficient.

  The TV microcomputer 64 controls the entire apparatus, and based on the detected communication state, the video and audio data are interrupted, the communication channel is being changed, the connection is being made, and the out of communication range is included. It has a function as a notification means for notifying each message of the reception sensitivity information.

  Further, the TV microcomputer 64 measures the time when the communication is interrupted and performs communication channel change control for holding the communication channel until a predetermined set time elapses after the communication is interrupted.

  Furthermore, the TV microcomputer 64 has an OSD generation function unit therein, and displays information such as a program channel, time, and volume on a screen of a television or the like. In an electronic device such as a video apparatus such as a TV or a video conference system, information such as a program channel, time, and volume is generally displayed on a TV screen. The OSD data is not an image, but is stored in a format called a bitmap. This bitmap is converted into YUV format pixel values represented by Y, Cb, and Cr, and the converted pixels are used for television broadcasting or the like. Is superimposed on the original image. This superimposing operation is performed by the OSD combining unit 69 described above.

  In addition, if an image playback device such as a DVD (not shown) is connected to the TV 4 video 4 input terminal 21, OSD display is possible by superimposing the playback image on the display screen.

  Although not shown, the TV main unit 3 includes a speaker, a key input unit, a slot for inserting / removing a card type external expansion storage medium, and the like. It is good also as a structure which reads directly. The card-type external extended storage medium includes, for example, an SRAM (Static RAM) card that holds information written by power backup, a compact flash (registered trademark) (CF) including a flash memory that does not require power backup, smart media, memory It is a very small hard disk drive (HDD) or the like that can be mounted on a stick or a PC card Type II.

  The remote control light receiving unit 66 provided in the TV main body 3 is an optical communication port unit using IR (Infrared Rays), and performs a variety of operations on the TV main unit 103 or the wireless center unit 102. The optical signal from the light is received. Specifically, the remote control light receiving unit 66 includes an I / O port for performing optical communication in accordance with a standard for transmitting data using infrared rays, IrDA (Infrared Data Association), ASK, and the like. Alternatively, it is a radio communication port using radio waves.

  The battery 67 supplies predetermined power to each part of the TV main unit 103. When the battery 67 is ready to be charged, the battery charger microcomputer 68 detects, for example, that the TV body unit 103 is mounted on the wireless center unit 102 or other cradle, and supplies power to the charging medium of the battery 67. Charge / discharge control is performed via terminals (both not shown). Specifically, the battery charger microcomputer 68 integrates the discharge current of the battery pack and starts charging when it is determined that the remaining capacity of the battery pack has become a predetermined value or less. The charging is stopped when it is determined that the battery pack has been fully charged. The charged battery 67 becomes the main power source of the portable TV when the TV main body 3 is disconnected from the commercial power source, and supplies power to each part of the main body.

  Next, a method for transmitting and receiving control data between the wireless center 2 and the TV main body 3 in the wireless AV system 101 of the present embodiment having the above-described configuration will be described.

  Here, the wireless center microcomputer 37 of the wireless center unit 102 performs the SS transmission / reception unit 36, the SS transmission / reception unit 61 of the TV main body unit 103, or the TV main body 3 in accordance with an input from the user or by an operation according to a predetermined program. It is assumed that control data including an identification code and a control command is transmitted to the TV microcomputer 64.

  Here, the identification code is a code for identifying which of a plurality of controlled devices is a control command, and is usually added to a header portion of control data.

  The TV command 44 transmitted by the wireless center microcomputer 37 of the wireless center 2 is received by the first SS-CPU 54 of the SS transmission / reception unit 36. When the TV command 44 is control data including a control command for the SS transmission / reception unit 36, predetermined processing is performed by the first SS-CPU 54.

  When the TV command 44 transmitted by the wireless center microcomputer 37 is control data for the SS transceiver unit 61 or the TV microcomputer 64 of the TV main unit 103, the first SS-CPU 54 of the SS transceiver unit 36 The data is wirelessly transmitted by the SS wireless transmission / reception engine 53 after predetermined encoding is performed on the data.

  The SS transmission / reception unit 61 of the TV main unit 103 that has received the wireless data identifies the control data in the second SS-CPU 84, and if this control data is control data for the SS transmission / reception unit 61, A predetermined process is performed by the SS-CPU 84.

  If the received data is control data for the TV microcomputer 64, the second SS-CPU 84 transmits the data to the TV microcomputer 64 as a TV command 71. Thereby, the TV microcomputer 64 performs a predetermined process on the TV main body 3.

  FIG. 4A to FIG. 4C are diagrams schematically showing transmission / reception of control data (hereinafter referred to as a control command) between the wireless center unit 102 and the TV main unit 103 described above.

  4A to 4C, the control device is the wireless center microcomputer 37 of the wireless center unit 102, the wireless station 1 is the SS transmission / reception unit 36 of the wireless center unit 102, and the wireless station 2 is. Is the SS transmission / reception unit 61 of the TV main unit 103, and the controlled device is the TV microcomputer 64 of the TV main unit 103.

  FIG. 4A shows a case where the control device transmits control data including a control command to the radio station 1 (own station) in the own device. This case is the first control data transmission / reception mode. In the first control data transmission / reception mode, for example, the wireless center microcomputer 37 includes a control command for changing the MPEG transmission rate or switching the radio channel to the SS transmission / reception unit 36 in accordance with the radio communication environment. A case where control data is transmitted can be assumed.

  FIG. 4B shows a case where the control device transmits control data including a control command to the radio station 2 (other station) other than its own device. This case is the second control data transmission / reception mode. In this second control data transmission / reception mode, for example, the wireless center microcomputer 37 changes the MPEG transmission rate or switches the radio channel to the SS transmission / reception unit 61 of the TV main unit 103 according to the radio communication environment. It can be assumed that control data including the control command is transmitted.

  FIG. 4C shows a case where the control device transmits control data including a control command to a controlled device other than its own device. This case is the third control data transmission / reception mode. In the third control data transmission / reception mode, for example, the wireless center microcomputer 37 changes the input program channel or various settings to the TV microcomputer 64 of the TV body 3 in response to an operation from the user. It can be assumed that control data including a control command for performing is transmitted.

  4A to 4C, the TV microcomputer 64 of the TV main unit 103 is a control device, and the wireless center microcomputer 37 of the wireless center unit 102 is a controlled device. In this case, it can be assumed that a control command for switching the tuner channel or switching the audio is transmitted. This point will be described later.

  Next, a data structure of control data transmitted and received in the present embodiment will be described. The wireless AV system 101 of this embodiment is characterized in that control data can be easily identified by transmitting and receiving a specific key code in the header portion (control command) of the control data.

  FIG. 5 is a diagram illustrating an example of key codes included in the control data. In the example shown in FIG. 5, the key code for identifying the control data is “0xFF”. This key code is set in advance and can be set arbitrarily. When the same code as the preset key code “0xFF” is included in the data body, this is converted according to a predetermined rule. That is, “0xFE” in the data body is converted to “0xFE 0x00”, and “0xFF” is converted to “0xFE 0x01”.

  By performing such conversion, the control data transmitted / received in this system is easily identified by the key code “0xFF” included in the header.

  On the control data receiving side, “0xFE 0x00” is converted to “0xFE”, and “0xFE 0x01” is converted to “0xFF”, whereby the original control data can be easily restored.

  FIG. 6 is a diagram showing an example of a format of control data transmitted / received in the wireless AV system 101 of the present embodiment. As shown in FIG. 6, the control data includes a command identification ID (control command including a key code), a data size, a data body (control command), and a checksum.

  The command identification ID is predetermined as an ID for identifying the transmission destination of the command. In this embodiment, the command for the wireless station of the local station is ID = 1 and the command for the wireless station of the other station is ID. = 2 and the command for the controlled device through the other station is identified by ID = 3. Furthermore, a command for an external device connected to the controlled device is identified by ID = 4.

  The checksum is a value (lower 1 byte) obtained by adding the command identification ID, data size, and data body value in units of 1 byte.

  FIG. 7A to FIG. 7D are diagrams illustrating examples of code conversion of control commands.

  FIG. 7A shows an example of conversion of a control command for the own radio station (control command for the radio station 1). In this case, the command identification ID is 1.

  FIG. 7B shows a conversion example of a control command (control command to the radio station 2) for the radio station of the other station. In this case, the command identification ID is 2.

  FIG. 7C shows a conversion example of the control command for the controlled device through another station. In this case, the command identification ID is 3.

  FIG. 7D shows an example of control command conversion for an external device connected to the controlled device. In this case, the command identification ID is 4.

  Regardless of the control command, the converted data has the key code “0xFF” at the beginning of the data, and “0xFE” and “0xFF” in the data before conversion are respectively Since it is converted into “0xFE 0x00” and “0xFE 0x01”, the key code is not misidentified.

  Here, specific examples of various control commands are shown below.

As an example of the local station command (command identification ID = 1),
Receive sensitivity command: 0x01 0x00 0x01 0x01 0x03
Channel number acquisition command: 0x01 0x00 0x01 0x02 0x04
and so on.

As an example of the other station command (command identification ID = 2),
Channel change command: 0x02 0x00 0x01 0x01 0x04
Other station device name acquisition command: 0x02 0x00 0x01 0x02 0x05
and so on.

As an example of a command (command identification ID = 3) to a device connected to another station,
Playback command: 0x03 0x00 0x02 0x00 0x01 0x06
Stop command: 0x03 0x00 0x02 0x00 0x02 0x07
Fast forward command: 0x03 0x00 0x02 0x00 0x03 0x08
Rewind command: 0x03 0x00 0x02 0x00 0x04 0x09
and so on.

  In the example shown in FIGS. 4A to 4C, it is assumed that the control device is the wireless center microcomputer 37 of the wireless center unit 102 and the controlled device is the TV microcomputer 64 of the TV main unit 103. However, conversely, the control device may be the TV main unit 103 and the controlled device may be the wireless center unit 102. An example at this time will be described below with reference to FIGS. 8A and 8B to FIGS. 11A and 11B for each purpose of each control command.

  Here, the control device is the TV microcomputer 64 of the TV main unit 103, the wireless station 1 is the SS transmission / reception unit 61 of the TV main unit 103, the wireless station 2 is the SS transmission / reception unit 36 of the wireless center unit 102, and the controlled device is The wireless center microcomputer 37 of the wireless center unit 102 is assumed, and the external device is assumed to be an AV device (not shown) such as a DVD recorder connected to the wireless center unit 102.

  When the purpose is to acquire the transmission radio wave intensity in the wireless station 1, control data is transmitted from the control device to the wireless station 1 as shown in FIG. In this case, command identification ID = 1, and the control data has a data structure as shown in FIG. Here, as shown in FIG. 7A, the control command included in the control data is converted by the TV microcomputer 64 of the TV main unit 103 which is a control device.

  The control data shown in FIG. 8B includes a 1-byte control command (control command after conversion shown in FIG. 7A) corresponding to the command identification ID = 1, and the size of the control data body is 2 bytes. The indicated size data, 1-byte data indicating the data body (command No. indicating transmission radio wave intensity), and 1-byte data (CRC) indicating the checksum are included.

  For the purpose of obtaining the received radio wave intensity at the wireless station 1, the control device transmits a control command to the wireless station 2 via the wireless station 1, as shown in FIG. In this case, the command identification ID = 2, and the control data has a data structure as shown in FIG. Here, as shown in FIG. 7B, the control command included in the control data is converted by the TV microcomputer 64 of the TV main unit 103 which is a control device.

  The control data shown in FIG. 9B includes a 1-byte control command corresponding to the command identification ID (a converted control command shown in FIG. 7B), and a 2-byte size indicated by the size of the control data. Data, 1-byte data indicating the data body (command No. indicating received radio wave intensity), and 1-byte data (CRC) indicating the checksum are included.

  When the purpose is to switch the external input in the controlled device, the control device transmits a control command to the controlled device via the wireless station 1 and the wireless station 2 as shown in FIG. In this case, command identification ID = 3, and the control data has a data structure as shown in FIG. Here, as shown in FIG. 7C, the control command included in the control data is converted by the TV microcomputer 64 of the TV main unit 103 which is a control device.

  The control data shown in FIG. 10B includes 1-byte data corresponding to the command identification ID, 2-byte size data indicated by the size of the control data, and 1-byte data indicating the data body (corresponding to input switching). Command No.), data corresponding to the parameter indicating the external input 1 includes 1-byte data (CRC) indicating the checksum.

  When the purpose is to directly control an external device via the controlled device, as shown in FIG. 11 (a), the controlling device is externally connected via the wireless station 1, the wireless station 2, or the controlled device. Send a control command to the device. In this case, command identification ID = 4, and the control data has a data structure as shown in FIG. Here, as shown in FIG. 7D, the control command included in the control data is converted by the TV microcomputer 64 of the TV main unit 103 which is a control device.

  The control data shown in FIG. 11B includes 1-byte data corresponding to the command identification ID, 2-byte data indicating the size of the control data (here, the data body is 80 bytes), and the data body. Data (command No. corresponding to remote control through), data corresponding to a parameter indicating an IrDA sampling data string, and 1-byte data (CRC) indicating a checksum are stored.

  As a specific example of the control command transmission shown in FIGS. 11A and 11B, for example, a wireless AV system 101 as shown in FIG. 12 can be considered. Here, in the wireless AV system 101 shown in FIG. 12, an external device such as a DVD player or a video deck connected to the wireless center unit 102 can be operated by the remote controller 130 via the TV main unit 103.

  As an application example of such remote control operation, a system as shown in FIG. 13 can be considered. In FIG. 13, three TV main units 103 a to 103 c transmit control data to one wireless center unit 102, and remote control is performed on external devices (device A to device C) connected to the wireless center unit 102. is doing. That is, the wireless center unit 102 is configured to send the control data received from the TV main unit 103 to the remote control light receiving units (110a to 110c) of the devices operated by the remote control.

  In this case, the control data is generated on the TV main unit 103 side, transmitted from the TV main unit 103 to the wireless center unit 102, and transmitted from the wireless center unit 102 to each external device. The process of distributing the control data to the external device at this time is performed by the wireless center microcomputer 37 in the wireless center unit 102.

  As described above, the wireless AV system 101 to which the wireless control system of the present invention is applied has been described with specific embodiments. However, the present invention is not limited to these. A person skilled in the art can make various changes and improvements to the configurations and functions of the invention according to the above-described embodiments or other embodiments without departing from the gist of the present invention.

  For example, in this embodiment, a portable TV is used as the wireless AV device. However, the present invention is not limited to a TV receiver, and can be applied to a device having a wireless communication function or a combination thereof. For example, as an AV device, in addition to a VTR (Video Tape Recorder), a recording / reproducing apparatus for recording on an HDD or a DVD may be used. In addition, as a device that can transmit and receive data, a device that is integrated with an information device function represented by a personal computer may be used, and it can be applied to all systems. The contents of the transmitted / received data may be anything.

  In this embodiment, the TV receiver has been described. However, the present invention is not limited to this, and as described above, the present invention can be applied to a tuner, a personal computer, and other AV devices using the tuner.

  In addition, the types of processing units and the like, the type / format of setting information, and the like constituting the wireless communication device and the wireless AV system are not limited to the above-described embodiments. In particular, it is suitable for application to a device that complies with HAVi.

  In addition, as a tuner, two broadcasts of a BS tuner and a U / V tuner are given as an example, but the type and number of broadcasts such as a CS tuner are not limited to this.

  In the present embodiment, the names wireless communication device and wireless AV system are used. However, this is for convenience of explanation, and may be a wireless communication device, an AV device, a broadcasting station channel selection device, or the like.

  The wireless communication device and the wireless AV system described above are also realized by a program for causing the wireless communication device and the wireless AV system to function. This program is stored in a computer-readable recording medium. In the present invention, as the recording medium, the main memory itself may be a program medium, or a program reading device is provided as an external storage device and can be read by inserting the recording medium therein. May be.

  In either case, the stored program may be configured to be accessed and executed by the CPU, or in any case, the program is read and the read program is not shown in a program storage area. The program may be downloaded and executed by the program. It is assumed that this download program is stored in the main device in advance.

  Here, the program medium is a recording medium configured to be separable from the main body, such as a tape system such as a magnetic tape or a cassette tape, a magnetic disk such as a floppy (registered trademark) disk or a hard disk, or a CD-ROM / MO /. It may be a medium carrying a fixed program including a disk system of an optical disk such as MD / DVD, a card system such as an IC card / optical card, or a semiconductor memory such as a mask ROM, EPROM, EEPROM, flash ROM or the like. .

  Furthermore, although not shown in the figure, when a means capable of connection to an external communication network is provided, the program is fluidly supported so that the program is downloaded from the communication network via the communication connection means. It may be a medium.

  When the program is downloaded from the communication network in this way, the download program may be stored in the main device in advance, or may be installed from another recording medium. The content stored in the recording medium is not limited to a program, and may be data.

  In addition, preparations for new digital terrestrial broadcasts to replace analog terrestrial broadcasts currently being watched nationwide are in progress. This digital terrestrial broadcasting started in 2003 in the three major metropolitan areas of Kanto, Kinki and Tokai, and is planned to be expanded nationwide in 2006. Along with this, the current analog broadcasting will be abolished in 2011.

  ISDB (Integrated Services Digital Broadcasting) is a next-generation integrated digital broadcasting concept that handles all information such as video, audio, and data as digital data. As specific services of ISDB, digital television broadcasting, digital audio broadcasting, facsimile broadcasting, multimedia broadcasting, and the like have been studied. As an ISDB transmission line, use of a satellite transmission wave, a terrestrial broadcast wave, a coaxial cable, or a wired transmission line of an optical fiber is considered.

  In this technical standard ISDB-T (Terrestrial) for digital terrestrial broadcasting, OFDM (Orthogonal Frequency Division Multiplexing) that uses a large number of carriers as a modulation method is adopted, and multiple propagation paths such as reflection by buildings are used. Ghost disturbance can also be suppressed. In ISDB-T, a transmission mode that defines the carrier interval, a modulation method for each carrier, and a plurality of guard intervals in the time axis direction that are provided for each effective symbol length are defined. Is allowed. Actually, an optimum format is selected from these according to services such as fixed reception and mobile reception.

  In ISDB-T, one transmission channel (bandwidth of about 5.6 MHz) is divided into 13 segments (1 segment = about 430 kHz), and the modulation method is changed in units of this. Accordingly, the broadcasting station can arbitrarily determine the signal configuration such as audio broadcasting and high-definition broadcasting, standard fixed broadcasting and mobile broadcasting using one transmission channel.

  Furthermore, since ISDB-T incorporates interleaving in the time axis direction and radio waves to be used are suitable for transmission to mobile objects, mobile receivers such as in-vehicle TVs, PDAs (Personal Digital Assistants) and mobile phones One of the major features is that stable reception is possible even with portable terminals such as the above. In the future, a service that assumes such mobile reception is also highly expected.

  Therefore, the wireless control system of the present invention can be suitably used for such services.

  The present invention may be configured as follows.

That is, an apparatus for transmitting / receiving control data between AV devices constituting a wireless AV system, wherein the control data is generated, the generated control data is converted, and the converted control data is transmitted / received wirelessly. Means to
An apparatus may be provided that includes means for identifying the converted control data and acquiring data before conversion.

  Further, the means for converting the control data adds a key code for identifying the control data to the head of the control data, and there is data having the same content as the key code in another part of the control data Alternatively, a certain conversion may be performed on the data.

  Further, the control data includes data for controlling AV communication stations in the AV apparatus constituting the wireless AV system and radio communication stations in AV apparatuses other than the AV apparatus. Data and data for controlling an AV device other than its own device may be included.

  The control data may include commands for changing the data transmission rate, changing the wireless communication channel, changing the tuner channel, and switching the input.

  As described above, according to the wireless AV system of the present invention, when transmitting / receiving control data between AV devices, the control data is identified according to the key code added to the header without having to process the data body. Therefore, it is possible to reduce the load of data identification work in the radio station and the terminal.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately changed within the scope of the claims are also included in the technical scope of the present invention.

  Note that in each unit of the wireless AV system 101 of the above-described embodiment, a calculation unit such as a CPU executes a program stored in a storage unit such as a ROM (Read Only Memory) or a RAM, an input unit such as a keyboard, a display This can be realized by controlling the output means or the communication means such as an interface circuit. Therefore, various functions and various processes of the wireless AV system 101 of the present embodiment can be realized simply by a computer having these means reading a recording medium storing the above program and executing the program. In addition, by recording the program on a removable recording medium, the various functions and various processes described above can be realized on an arbitrary computer.

  As this recording medium, a program medium such as a memory (not shown) such as a ROM may be used for processing by the microcomputer, or a program reader is provided as an external storage device (not shown). It may be a program medium that can be read by inserting a recording medium therein.

  In any case, the stored program is preferably configured to be accessed and executed by the microprocessor. Furthermore, it is preferable that the program is read out, and the read program is downloaded to a program storage area of the microcomputer and the program is executed. It is assumed that this download program is stored in advance in the main unit.

  The program medium is a recording medium configured to be separable from the main body, such as a tape system such as a magnetic tape or a cassette tape, a magnetic disk such as a flexible disk or a hard disk, or a disk such as a CD / MO / MD / DVD. Fixed disk, IC card (including memory card), etc., or semiconductor ROM such as mask ROM, EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), flash ROM, etc. In particular, there are recording media that carry programs.

  In addition, if the system configuration is capable of connecting to a communication network including the Internet, the recording medium is preferably a recording medium that fluidly carries the program so as to download the program from the communication network.

  Further, when the program is downloaded from the communication network as described above, it is preferable that the download program is stored in the main device in advance or installed from another recording medium.

  The wireless control system according to the present invention is a wireless control system including a control device and a controlled device that is wirelessly controlled by the control device. The control device controls the controlled device. And wirelessly transmitting to the controlled device control data in which an identification code for identifying the controlled device to which the control command is transmitted and other controlled devices in the system is added to the control command. The controlled device receives control data wirelessly transmitted from the control device, reads an identification code included in the received control data, and selects a controlled device to execute a control command included in the control data. The control data is identified and transmitted to the identified controlled device.

  Furthermore, the wireless control system according to the present invention is a wireless control system including a control device and a controlled device that is wirelessly controlled by the control device, wherein the control device controls the controlled device. A control data generation unit for generating control data by adding an identification code for identifying the controlled device to which the control command is to be transmitted and other controlled devices in the system to the control command; A wireless communication unit that transmits the control data transmitted from the control data generation unit to a controlled device that is a transmission partner, the controlled device receiving a control data from the control device, and a reception An identification unit that reads the identification code included in the control data and identifies the controlled device that is to execute the control command included in the control data; It is characterized in that a control data transmitting unit for transmitting the control data to the controlled device identified by the section.

  The control data generation unit performs a predetermined conversion process on the same data when the generated control data includes the same data as a preset key code, and converts the control data after the conversion process into You may make it transmit to the said radio | wireless communication part.

  The control data generated in the control data generation unit is included in the control data transmitted to the control unit included in the control device, the control data transmitted to the wireless communication unit in the control device, and the controlled device. Any of control data transmitted to the control unit and control data transmitted to the wireless communication unit in the controlled device may be used.

  The control data may include, as control commands, commands for changing the data transmission rate, changing the wireless communication channel, changing the tuner channel, switching the input, and acquiring the communication state.

  The wireless communication unit may transmit control data by a spread spectrum wireless system.

  The wireless communication unit may perform wireless LAN or low-power short-distance bidirectional wireless communication such as Bluetooth (registered trademark) and UWB (Ultra Wide Band).

  A controlled device according to the present invention is a controlled device in a wireless control system including a control device and a controlled device that is controlled wirelessly by the controlled device, and the controlled devices in the system are Control data including an identification code for identifying the control device is received from the control device, and based on the identification code included in the received control data, the controlled device to execute the control command included in the control data is identified. It is characterized by doing.

  In addition, a controlled device according to the present invention is a controlled device in a wireless control system including a control device and a controlled device that is wirelessly controlled by the controlled device, and the controlled device in the system is controlled. A wireless communication unit that receives control data including an identification code for identifying devices from the control device and a control command included in the control data by reading the identification code included in the received control data An identification unit for identifying a controlled device and a control data transmission unit for transmitting the control data to the controlled device identified by the identification unit are provided.

  A control device according to the present invention is a control device in a wireless control system including a control device and a controlled device that is controlled wirelessly by the control device, and is a control for controlling the controlled device. Control data obtained by adding an identification code for identifying the controlled device to which the control command is to be transmitted and other controlled devices in the system to the command is wirelessly transmitted to the controlled device. It is characterized by doing.

  Further, a control device according to the present invention is a control device in a wireless control system including a control device and a controlled device that is controlled wirelessly by the control device, for controlling the controlled device. A control data generation unit for generating control data by adding an identification code for identifying the controlled device to which the control command is to be transmitted and other controlled devices in the system to the control command; And a wireless communication unit that transmits the control data transmitted from the control data generation unit to a controlled device that is a transmission partner.

  The device control method according to the present invention is a device control method in which a controlled device is wirelessly controlled by a control device, wherein the control device includes a transmission target of the control command in a control command for controlling the controlled device. Control data to which an identification code for identifying the controlled device and the other controlled device in the system is added is wirelessly transmitted to the controlled device, and the controlled device transmits the control data wirelessly transmitted. Based on the identification code included in the received control data, identifying the controlled device that should execute the control command included in the control data, and transmitting the control data to the identified controlled device It is characterized by.

  A control program according to the present invention is a control program for operating the wireless control system having the above-described configuration, and is a control program for causing a computer to function as each of the above-described units.

  A recording medium according to the present invention is a computer-readable recording medium in which the control program is recorded.

  In order to solve the above problems, a wireless control system according to the present invention is a wireless control system including a control device and a controlled device that is controlled wirelessly by the control device. Control data obtained by adding an identification code for identifying a controlled device to which the control command is to be transmitted and other controlled devices in the system to the control command for controlling the controlled device. In addition to wireless transmission to a device, the controlled device receives control data wirelessly transmitted from the control device, reads an identification code included in the received control data, and executes a control command included in the control data A controlled device to be controlled is identified, and the control data is transmitted to the identified controlled device.

  In order to solve the above problems, a wireless control system according to the present invention is a wireless control system including a control device and a controlled device that is controlled wirelessly by the control device. The control data is added to the control command for controlling the controlled device by adding an identification code for identifying the controlled device to which the control command is transmitted and other controlled devices in the system. A control data generation unit for generating, and a wireless communication unit for transmitting the control data transmitted from the control data generation unit to a controlled device as a transmission partner, wherein the controlled device receives control data from the control device. And a controlled device that reads an identification code included in the received control data and executes a control command included in the control data And identifying the identification portions, and characterized in that a control data transmitting unit for transmitting the control data to the controlled device identified by the identification unit.

  According to the above configuration, the control device generates control data in which the identification code between the controlled devices is added to the control command, and the controlled device performs control data identification processing using the control data. Therefore, even if the number of controlled devices to be controlled by one control device increases, the processing amount for control data identification in the control device does not increase.

  Therefore, even if the number of controlled devices increases, the control device does not increase the burden of data processing. Therefore, each controlled device can be controlled quickly. As a result, the entire wireless AV system can be operated smoothly. There is an effect.

  The control data generation unit performs a predetermined conversion process on the same data when the generated control data includes the same data as a preset key code, and converts the control data after the conversion process into You may make it transmit to the said radio | wireless communication part.

  In this case, since erroneous recognition of the identification code can be eliminated, the control device can always control an appropriate controlled device.

  The control data generated in the control data generation unit is included in the control data transmitted to the control unit included in the control device, the control data transmitted to the wireless communication unit in the control device, and the controlled device. Any of control data transmitted to the control unit and control data transmitted to the wireless communication unit in the controlled device may be used.

  In addition, the control data may include commands for performing data transmission rate change, wireless communication channel change, tuner channel change, input switching, and communication state acquisition as control commands.

  Further, the controlled device of the wireless control system may have the following configuration.

  That is, a controlled device according to the present invention is a controlled device in a wireless control system including a control device and a controlled device that is controlled wirelessly by the control device, and the controlled device in the system is controlled. Controlled device that receives control data including an identification code for identifying devices from the control device and executes a control command included in the control data based on the identification code included in the received control data The structure which identifies may be sufficient.

  In addition, a controlled device according to the present invention is a controlled device in a wireless control system including a control device and a controlled device that is wirelessly controlled by the controlled device, and the controlled device in the system is controlled. A wireless communication unit that receives control data including an identification code for identifying devices from the control device and a control command included in the control data by reading the identification code included in the received control data The configuration may include an identification unit that identifies a controlled device and a control data transmission unit that transmits the control data to the controlled device identified by the identification unit.

  Further, the control device of the wireless control system may have the following configuration.

  That is, a control device according to the present invention is a control device in a wireless control system including a control device and a controlled device that is controlled wirelessly by the control device, and controls the controlled device. Control data obtained by adding an identification code for identifying the controlled device to which the control command is transmitted and other controlled devices in the system to the control command to the controlled device. It may be configured to transmit wirelessly.

  Further, a control device according to the present invention is a control device in a wireless control system including a control device and a controlled device that is controlled wirelessly by the control device, for controlling the controlled device. A control data generation unit for generating control data by adding an identification code for identifying the controlled device to which the control command is to be transmitted and other controlled devices in the system to the control command; The wireless communication part which transmits the control data transmitted from the control data generation part to the controlled apparatus which is a transmission partner may be sufficient.

  As the wireless communication unit, a communication unit that transmits control data by a spread spectrum wireless system can be preferably used.

  In addition, as the wireless communication unit, a communication unit that performs low-power short-distance bidirectional wireless communication such as a wireless LAN or Bluetooth and UWB (Ultra Wide Band) can be preferably used.

  The wireless control system may be realized by a computer, and in this case, a computer-readable record that records a control program for realizing the wireless control system by the computer by operating the computer as each unit. Media also falls within the scope of the present invention.

  Therefore, in the wireless control system according to the present invention, as described above, the control device transmits a control command for controlling the controlled device to the controlled device to which the control command is transmitted and other devices in the system. Control data added with an identification code for identifying the controlled device is wirelessly transmitted to the controlled device, and the controlled device receives and receives the control data wirelessly transmitted from the controlled device. By reading the identification code included in the control data, identifying the controlled device that should execute the control command included in the control data, and transmitting the control data to the identified controlled device, the control device Even if the number of controlled devices increases, the burden of data processing does not increase, so that each controlled device can be controlled quickly. There is an effect that the entire arm can smoothly run.

  The wireless system of the present invention is suitable for an in-home AV network system such as a display-separated type wireless TV receiver that wirelessly transmits video and / or audio data, but is not limited thereto. The present invention is widely applicable to wireless communication devices such as PHS (registered trademark) (Personal Handy-Phone System) and personal digital assistants (PDA (Personal Digital Assistants)).

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, showing an embodiment of the present invention, is a block diagram showing a main configuration of a wireless AV system. It is a block diagram which shows the principal part structure of the wireless center unit which comprises the wireless AV system shown in FIG. It is a block diagram which shows the principal part structure of TV main body unit which comprises the wireless AV system shown in FIG. (A)-(c) is the figure which showed typically transmission / reception of the control command between a wireless center unit and TV main body unit. It is a figure which shows an example of the key code included in control data in the wireless AV system shown in FIG. It is a figure which shows an example of the data format of the control command transmitted / received in the wireless AV system shown in FIG. (A)-(d) is a figure which shows the conversion example of the control data comprised according to the conversion method and data structure of the above-mentioned control data. (A) is a schematic diagram which shows transmission / reception of control data for the purpose of acquisition of the transmission radio wave intensity in the radio station 1, and (b) is a diagram showing a data structure of control data. (A) is a schematic diagram which shows transmission / reception of control data, and (b) is a figure which shows the data structure of control data in the case of acquiring the received radio wave intensity in the radio station 1. When switching the external input in the controlled device, (a) is a schematic diagram showing transmission / reception of control data, and (b) is a diagram showing a data structure of control data. (A) is a schematic diagram showing transmission / reception of control data, and (b) is a diagram showing a data structure of control data, when the purpose is to perform remote control directly on an external device via a controlled device. . It is a figure which shows the specific example of the wireless AV system of this invention. It is a figure which shows the example of application of the wireless AV system shown in FIG.

Explanation of symbols

1 Wireless transmission network 2 Wireless center (control equipment, controlled equipment)
3 TV body (control equipment, controlled equipment)
11 BS terminal 12 U / VHF antenna terminal 13 Diversity terminal 14 Video 1 input terminal 15 Video 2 input terminal 16 Video 3 input terminal 17 AC power supply unit 18 Car-DC power supply unit 21 Video 4 input terminal 22 AC power supply unit 23 Car-DC Power supply unit 31 BS tuner 32 U / VHF tuner 33 Video / audio demodulation unit 34 Audio switching unit 35 First AV selector 36 SS transmission / reception unit (wireless communication unit)
37 Wireless center microcomputer (control data generation unit, identification unit, control data transmission unit)
38 EEPROM
41 Channel selection signal 42 Audio switching signal 43 Source selection signal 44 TV command 51 A / D converter 52 MPEG2 encoder 53 SS wireless transmission / reception engine 54 CPU
61 SS transceiver unit (wireless communication unit)
62 Second AV selector 63 TV section 64 TV microcomputer (control data generation section, identification section, control data transmission section)
65 EEPROM
66 Remote control light receiving unit 67 Battery 68 Battery charger microcomputer 69 OSD synthesis unit 71 TV command 72 Source selection signal 73 OSD signal 81 SS wireless transmission / reception engine 82 MPEG2 decoder 83 D / A conversion unit 84 CPU
101 Wireless AV system (wireless control system)
102 Wireless center unit 103 TV main unit 130 Remote control

Claims (3)

Between AV devices that make up a wireless AV system,
An apparatus for transmitting and receiving control data, the means for generating control data;
Means for converting the generated control data;
Means for wirelessly transmitting and receiving the converted control data;
Means for identifying the converted control data and obtaining data before conversion ,
The means for converting the control data includes:
A key code for identifying the control data is added to the head of the control data, and when there is data having the same content as the key code in another part of the control data, a constant conversion is performed on the data A device characterized by performing . The control data is
Data for controlling the wireless communication station in the own device by the AV device constituting the wireless AV system, data for controlling the wireless communication station in the AV device other than the own device, and data other than the own device The apparatus according to claim 1, further comprising data for controlling the AV device. The control data is
The apparatus according to claim 1, comprising commands for changing a data transmission rate, changing a wireless communication channel, changing a tuner channel, and switching an input.

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