JP4446878B2 - AV data transmitter, AV data receiver, AV data display / playback device - Google Patents

Description

  The present invention relates to an AV (audio / video) data transmitting apparatus, AV data receiving apparatus, and AV data display / reproducing apparatus for displaying and reproducing video, music, and audio.

  2. Description of the Related Art Conventionally, there are devices described in Patent Document 1 and Patent Document 2 that receive AV data and transmit a control command to control a device in an example video source. The devices described in these documents have a function that the secondary AV device receives the AV data transmitted wirelessly and transmits the control command received by the infrared remote control transmitter to the main AV device wirelessly. Yes.

  For example, this conventional system discloses that the transmission is performed by a 2.4-GHz-band spread spectrum wireless communication, but the control of the video quality is not described. If the wireless reception state is poor, data errors and loss occur, and the video cannot be reproduced correctly. There is no disclosure of changing a wireless channel in order to avoid a failure or avoiding the influence of noise generated by a communication method such as Bluetooth.

  Since the AV data receiving apparatus uses radio waves, it can be transmitted by radio reflection or the like, and thus does not necessarily have to be placed in a visible range visible to the user. However, when using infrared rays as in the case of infrared remote control, the infrared receiver must be in a range that can be directly seen by the remote control transmission of the user.

  If all infrared commands are transmitted through the wireless section, there is a possibility that an incorrect device is controlled on the command receiving side. When the AV data receiving device is contained in a single unit, it can be used in conjunction with a portable AV data display / playback device such as a flat panel display. And AV data receiving apparatus must be carried separately.

  In addition, when operating an AV data receiving device and an AV data display / playback device with an infrared remote control, sufficient operation cannot be performed without an infrared remote control transmitter. Therefore, the AV data display / playback device, AV data receiving device If you carry a remote control transmitter, you also need to carry a remote control transmitter.

Japanese Patent Laid-Open No. 9-74498 (page 3, FIG. 1) JP 2000-251456 A (page 3-4, FIGS. 1 and 2)

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an apparatus that allows a user to easily and conveniently use an AV data display / playback apparatus from an infrared remote control via an AV data receiving apparatus. And

An AV data receiving apparatus for receiving AV data by radio wave and transmitting a command according to the present invention provides a quality of AV data, a data amount of AV data, and a channel used for the radio wave in accordance with a communication error situation related to the reception of AV data. A command for requesting any of these changes is transmitted by radio wave to an AV data transmitting apparatus that communicates with the AV data receiving apparatus, and the quality of the AV data or the AV data is transmitted. The change in the amount of data or the change in the channel used for the radio can be set by the user, and the change can be set by the user as a command. And a control command for controlling an AV data output device connected to the AV data transmission device, A control command receiving unit for receiving from an external device, wherein the control command receiving unit performs a predetermined conversion on the received control command and outputs the command as a command; The control command can be output as the command, and the output command is transmitted to the AV data transmission device by radio waves .

In the AV data receiving apparatus according to the present invention , the control command for controlling the AV data output apparatus corresponds to a switch provided in a main body of the AV data receiving apparatus .

According to the AV data receiver of the present invention, it is possible to change all of the quality of AV data, the amount of AV data, and the channel used for radio waves in order to cope with the situation of the communication line. Depending on the error status and purpose, a request for changing any of these can be sent from the AV data receiving device to the transmitting device by a command, so that optimum communication is possible in light of the status and purpose. In addition, it is possible to change either one of the group for changing the quality of the AV data or the amount of data of the AV data and the group for changing the channel used for radio, and both can be changed. The AV data receiving device can select whether to make one change or both changes. That is, since these changes can be made in detail from the data receiving side that determines the situation and purpose, the desired AV data can be received in the desired state. Further, the AV data output device connected to the AV data transmission device can be controlled from the receiver side using, for example, a remote controller, and the usability is improved.

In addition, since the control command for controlling the AV data output device corresponds to a switch provided in the main body of the AV data receiving device, the receiving side displays a change operation on the screen, This can be easily realized without displaying the image quality setting on the screen and by setting the image quality setting and the communication quality in a place unrelated to the screen.

  Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

  FIG. 1 is a diagram of the overall system of the present invention. 1 is an AV data output device such as a video, DVD, tuner, stereo, personal computer, 2 is an AV data transmitting device, 3 is an AV data receiving device, 4 is a flat panel display such as a liquid crystal television, and AV such as a monitor or personal computer A data display / reproduction device 132 is an infrared remote control transmitter. In this figure, the AV data output device 1 and the AV data transmission device 2 are connected by a cable 5, and the AV data reception device 3 and the AV data display / playback device 4 are similarly connected by a cable (not shown). It is possible to use other formats. For example, the AV data transmitting device 2 and the AV data receiving device 3 may be connected via a PCI bus or the like in the form of a PCI board or a PCMCIA card. AV data and asynchronous data are transmitted between the AV data transmitter 2 and the AV data receiver 3 using radio waves. The remote control transmitter 132 may use radio waves, and infrared light may be used between the AV data transmitting device 2 and the AV data receiving device 3.

  FIG. 2 shows a block diagram of the transmission basic portion 21 of the AV data transmitting apparatus 2 for changing the AV data quality. Reference numeral 11 denotes a video input unit for inputting AV data such as video (still images and moving images), music, and voice from an external device such as the AV data output device 1. An encoding unit 12 compresses the AV data input to the video input unit 11. In this case, when transmitting AV data such as video, music, and audio at the same time, the MPEG2 system, particularly TS (Transport Stream) having a constant bit rate is often used, but the present invention is not limited to this system. The encoding unit 12 may have a function for converting the bit rate of the originally encoded data or making it into another format.

  A communication control unit 13 performs communication control for transmitting AV data and transmitting / receiving control commands and asynchronous data. The communication control unit 13 detects whether a data is flowing in a TDMA (Time Domain Multiplex Duplex) method in which transmission and reception are separated in terms of time and controls whether data is flowing in a wireless section, and starts CSMA / There is a communication control method such as CA (Carrier Sense Multiple Access / Collision Avidance), but the method is not limited. A modulation / demodulation unit 14 modulates / demodulates AV data. The radio is a radio wave of 2.4 GHz band, 5 GHz band, 25 GHz band, 60 GHz band, etc., but the frequency band is not limited here. Reference numeral 15 denotes an RF unit including up-conversion to a radio frequency, down-conversion from a radio frequency to a frequency that can be handled by a digital circuit, and radio-specific circuits such as an amplifier circuit. Reference numeral 16 denotes an output part that actually transmits and receives radio waves, and an antenna in the case of radio waves. Reference numeral 17 denotes a CPU that performs overall control. A ROM 18 stores programs and tables used by the CPU. Reference numeral 19 denotes a RAM used as a working area by the CPU. Depending on the mounting method, the RAM 19 may be used by an encoding unit, a communication control unit, or the like.

  Reference numeral 20 denotes a quality change setting unit for setting the quality change of the AV data by the user. As the quality to be set, for example, three types of high quality, medium quality, and low quality can be considered. This is set by the user according to the situation at that time. When the quality is set, the information is read by the CPU 17 and the result is transmitted to the encoding unit 12 and the communication control unit 13 if necessary. For example, when the setting is changed from high quality to low quality, the amount of data output from the encoding unit 12 is reduced (eg, reduced from 7 Mbps to 4 Mbps). As a result, the bandwidth used for communication is reduced accordingly, and the reduced 3 Mbps bandwidth can be used for other applications (for example, Internet communication).

  As an example of realization, a case where the user changes the quality of AV data and consequently changes the communication band will be described. When the quality change is set by the quality change setting unit 20 in FIG. 2, the CPU 17 reads the information and sets a new data rate in the encoding unit 12 and the communication control unit 13. At this time, the communication control unit 13 changes the communication band in accordance with the change in the encoding data rate. FIG. 3 shows a conceptual diagram of a packet sequence. The horizontal axis of this figure is time, and FIG. 3A shows an example of high image quality (high quality), and FIG. 3B shows an example of medium image quality (medium quality). A section indicated by 31 is an entire AV data transmission section for transmitting AV data, and this section is visited at a predetermined time according to the AV data rate. Reference numeral 32 denotes an AV data transmission main section for sending AV data. If no error occurs, video data can be transmitted using the entire AV data transmission main section 32. A hatched rectangle Q1 represents an AV data packet, and a white rectangle Q2 represents an Ack packet indicating receipt confirmation. The arrival confirmation with the Ack packet is an example, and can be replaced with a Nack packet indicating that the packet has not arrived.

  Reference numeral 33 denotes an AV data retransmission section for retransmission. When an error occurs during the AV data transmission main section 32, retransmission is performed in the AV data retransmission section 33. In this example, even if one of the six packets is erroneous, the video disturbance does not occur by retransmitting the erroneous one packet. FIG. 3B shows an example in the case of medium image quality. In this example, all AV data transmission sections 36 in the case of medium image quality transmit normal AV data in four packets so that the communication band becomes small. . The AV data retransmission section 35 for medium image quality is for one packet. That is, the amount of data can be reduced by lowering the quality of AV data, and the wireless band can be increased for other communications. In this example, since the amount of data transmitted from the entire AV data transmission section 31 to the entire AV data transmission section 36 in the case of medium image quality has decreased, the bandwidth of other communication increases by this difference. In this example, it is assumed that there is a retransmission, but the same can be applied without a retransmission. Although not shown in the case of low image quality (low quality), the entire AV data transmission interval is set to 3 packets, of which 2 packets are the AV data transmission main interval and 1 packet is the AV data retransmission interval.

  As another embodiment, a case where the reliability of communication is changed simultaneously with the change of AV data quality is shown. FIG. 4 shows a conceptual diagram of the packet sequence in this case. (A) shows an example of high-quality AV data transmission, and (b) shows an example of medium-quality AV data transmission. In this example, the AV data retransmission section 33 is a single retransmission, whereas the AV data retransmission section 37 in the case of medium image quality can be retransmitted three times. In this case, recovery is possible even if an error occurs in up to 3 frames in the section (consisting of 4 frames) indicated by the entire AV data transmission section 34 in the case of medium image quality.

  In this embodiment, the entire AV data transmission section 31 and the entire AV data transmission section 38 are set to the same length. Although not shown in the case of low quality, the AV data retransmission interval is set to 4 times or 5 times. Therefore, although the AV data quality is lowered, the probability of errors occurring in the radio can be drastically reduced by increasing the number of retransmissions. In addition to the method for controlling the number of packets as in this example, a method for controlling the packet length is also conceivable in bandwidth control, but any other method may be used here.

  As a method of changing the reliability of communication, an error correction code may be added or removed in addition to changing the number of retransmissions. In this way, by changing the AV data quality setting and simultaneously changing the reliability, if an error occurs in the communication section, the communication error can be reduced by setting the AV data quality setting to a lower value. become. Note that the quality change setting of the quality change setting unit 20 is performed by the user in the quality change setting unit 20 of the transmission device, but the setting is made on the AV data receiving device and / or the AV data display / playback device side. As a result of the change command being received by the transmission device through the wireless section, the change may be set in the quality change setting unit 20 of the transmission device.

  Also, when it is necessary to change the setting on the receiving device side for changing the bandwidth or changing the number of retransmissions, send a command for changing the bandwidth or changing the number of retransmissions from the transmitting device side to the receiving device side. The setting may be changed. Regarding the quality setting, in the IEEE802.11b standard, the speed of the wireless section is a maximum of 11 Mbps. When MPEG2TS video / music is transmitted at this speed, the high image quality (high quality) is about 7 Mbps, and the medium image quality (medium quality). Is set to about 5 Mbps, and low image quality (low quality) is preferably set to about 4 Mbps. Furthermore, in the IEEE802.11a standard, there is a maximum speed of 54 Mbps, but it is desirable for the above-mentioned AV data transmission rate to be further added to about 24 Mbps and 12 Mbps in the case of MPEG2 moving images.

  An example of setting means for changing the AV data quality of the present invention is to realize the quality change setting unit 20 with a switch. A normal user changes the AV data quality according to the communication status, for example, when watching a movie. In this case, it is not preferable to display the change operation on the screen or display the image quality setting or the like on the currently displayed screen. For this reason, it is possible to make a judgment by simply looking at the current AV data quality setting, such as a rotary switch and a slide switch, and making it possible to set the image quality in a place unrelated to the screen. Setting can be realized.

  The quality setting switch may be installed in the AV data receiving device, the setting status may be transmitted to the transmitting device as a wireless control command, and the AV data quality setting may be changed by the quality change setting unit 20 of the transmitting device. . FIG. 5 shows the quality setting switch 41. In this example, switching between high image quality, medium image quality, and low image quality is performed.

  FIG. 6 shows a block diagram when changing the radio channel as another embodiment of the present invention. 21 is the same as the basic transmission part of the AV data transmission apparatus of FIG. Reference numeral 40 denotes a channel changing unit that changes the radio channel. When the setting of the channel changing unit is changed, the CPU 17 reads the information and sets a new channel in the communication control unit 13. Usually, there are a plurality of channels that can be used simultaneously in the radio. In the case of the IEEE802.11b system that transmits data at 11 Mbps in the 2.4 GHz band, there are 3 channels of 11 Mbps at the same time, and it is possible to select any of these 3 channels. The three channels have different communication error rates depending on the situation of devices that emit ambient radio waves. By switching the channel, it is possible to select a channel with a lower error rate.

  In the present invention, by switching the channel with the switch, the user can confirm the current channel only by looking at the set position of the switch without having to confirm the current state by switching the display of the screen, and the screen. It is possible to change the setting without displaying it. As another channel selection method, statistical information of communication quality (for example, error rate information for each channel that changes according to the month, day of the week, and time) is prepared in advance, and based on this information, the transmission apparatus internally You may make it switch automatically.

  FIG. 7 shows the channel changeover switch 42. This example shows a rotary switch that switches between each channel of 1ch, 6ch, 11ch, and 14ch and an Auto mode in which the channels of 1ch, 6ch, and 11ch are automatically and periodically changed. This switch is installed on the AV data receiving device 3 and / or the AV data display / playback device 4 side, and the setting result is sent as a control command to the transmitting device 2 side by radio to operate the channel changing unit of the transmitting device 2 You may make it. Note that how the receiving apparatus 3 follows the channel change set on the AV data transmitting apparatus 2 side is switched by transmitting a channel change command from the AV data transmitting apparatus 2 side to the AV data receiving apparatus 3 side. It is also possible. Further, along with the change of the transmission channel, the channel on which AV data is flowing may be automatically detected on the side of the AV data receiving apparatus, and the channel may be automatically changed.

  As another example of changing the radio channel of the present invention, particularly when using a 2.4 GHz (2400 to 2497 MHz) band, a band exceeding 13 channels (center frequency 2472 MHz) can be set (in terms of channels). 14 channels). In the 2.4 GHz band, there is a communication method called Bluetooth that performs communication while circulating a wide band in a short time. Since Bluetooth performs communication from 1 to 13 channels while changing the frequency at a frequency of a maximum of 1600 times per second, the noise of the 1-13 channel increases for wireless systems other than Bluetooth. Therefore, in a band exceeding 13 channels not used by Bluetooth, it is difficult to be affected by the noise of Bluetooth. Therefore, it is possible to select a channel with few communication errors by performing this setting. Of course, the setting change method in this case may be changed by a switch or a remote controller, or may be changed by displaying a channel change scene.

  There is also a method for automatically determining the change in communication reliability (number of retransmissions) due to the change in AV data quality. When an error correction code (for example, Reed-Solomon code) is added to the transmission packet on the AV data transmission side, the AV data receiving apparatus side can perform error correction and obtain the number of error-corrected bytes. It is also possible to discriminate blocks that cannot be corrected for errors (a unit of blocks to which Reed-Solomon codes are applied, usually about 200 bytes). Further, the AV data receiving device 3 can determine the missing of a packet based on the sequence number and time information of the received packet based on the sequence number and time information added on the transmission side (sequence numbers of 5, 6, 7, and 9). When a packet is received, it can be determined that there are no 8 packets). When such information is used, the AV data receiving device 3 can estimate the error level of the current channel. Based on this information, a command such as AV data quality change or channel change is transmitted to the transmitting device 2. And can be changed.

  FIG. 8 shows a block diagram of a basic transmission portion of the AV data transmitting apparatus when receiving a control command from a wireless section and transmitting the control command to an external device using, for example, infrared rays. 21 is the same as the basic transmission part of the AV data transmission apparatus of FIG. A command conversion unit 51 converts a control command received in the wireless section into a format suitable for the external device. An IR command transmission unit 52 transmits a control command (for example, an infrared control signal) to an external device (for example, a display device) such as an AV data reception apparatus, and includes an LED and a photodiode, for example.

  FIG. 9 shows a flow in the case of transferring the control command transmitted wirelessly from the AV data receiving device 3 to the external AV data output device 1 in the AV data transmitting device 2 of FIG. 61 is a step of receiving a control command sent as asynchronous data from the AV data receiver 3. 62 is a step of determining whether the command is addressed to the device. The device-addressed command includes, for example, transmission frequency switching and image quality change. Whether the device is addressed or not is determined by an identification code included in the command. In 63, a control command that is not addressed to the device is transmitted to a video or the like that is an external AV data output device through an IR command transmission unit to perform control. In the case of video, there are control commands such as fast forward, rewind, and stop. 64 receives the control command addressed to the device and controls the device. The commands addressed to the device are commands for changing the AV data quality, changing the radio channel, starting and ending AV data transmission, and control the encoding unit, the communication control unit, the modem unit, and the RF unit.

  FIG. 10 shows another flow when the AV data transmitting apparatus 2 transfers a control command transmitted from the AV data receiving apparatus 3 by radio to the AV data output apparatus 1. 71 is a step of receiving a command transmitted through the wireless section in the same manner as in step 61. Reference numeral 72 denotes a step of referring to the conversion table recorded in the ROM 18 or RAM 19 to determine whether or not the command currently being processed exists in the conversion table. 73 is a step for performing command conversion when a command exists in the conversion table. 74 is a step of transmitting the converted command to the AV data output device 1 using an infrared ray, for example. In this example, commands that do not correspond to the conversion table are ignored, but if they do not correspond to the conversion table, they are sent without conversion, or a table is used to determine that transmission is not performed instead of the conversion table. Thus, it may be determined whether transmission is possible.

  For example, according to the present invention, a “video playback” command received from the wireless section is converted into an infrared command of “video playback made by S”, or a “volume up” command of the television received from the wireless section is transmitted to an external device. Setting such as not to be possible. For example, when the user operates the remote controller on the AV data receiving device side, the command is sent to the AV data transmitting device side through the wireless section. In this case, it is likely that the user is operating the volume of the television in front of himself / herself, and does not control the television around the AV data transmitting apparatus that may be in another room.

  Therefore, in such a case, according to the present invention, by setting the conversion table so that the television control command is not transmitted to the external device, the television control command is not issued on the AV data transmitting device side, and the AV data transmission is performed. A television in the vicinity of the device is not erroneously controlled.

  As another embodiment of the present invention, a rewritable command conversion table (conversion rule) of the command changing unit can be changed from the outside. By changing the command conversion table, the “video playback” command received from the wireless section is first converted to the IR command of “S company video playback”. It is possible to change the “play” command to a “play DVD by company P” command. According to the present invention, it becomes possible to issue a control command corresponding to an AV data output device held by a user.

  FIG. 11 shows an implementation example of the AV data transmitting apparatus. In the figure, reference numeral 81 denotes a factory shipment terminal. The contents of the ROM can be changed from this terminal 81, or internal diagnosis can be performed. Reference numeral 82 denotes an AV output terminal. Reference numeral 83 denotes an AV input terminal. AV data input from the AV input terminal 83 is encoded inside the AV data transmitting apparatus and transmitted to the AV data receiving apparatus, but at the same time, the same data is output to the AV output terminal 82 as it is. This is because, for example, it is assumed that this AV data transmitting apparatus is inserted between the connection of the video and the television. In this case, the output of the AV output terminal 82 is connected to the television near the video. In this case, it is desirable that the signal of the AV input terminal 83 is output to the AV output terminal 82 even when the power of the AV data transmitting apparatus is not turned on.

  84 is a terminal for connecting the infrared light emitting section. This is for converting a control command transmitted wirelessly into an infrared command, blinking an infrared light emitting unit connected to the end of this terminal, and controlling a device (for example, video) ahead of the terminal. Reference numeral 85 denotes an image quality changeover switch. Reference numeral 86 denotes a communication channel changeover switch. Reference numeral 87 denotes a power input terminal. Reference numeral 88 denotes a housing of the AV data transmission apparatus. Reference numerals 89 and 91 denote planar antennas fixed inside the casing, and 90 denotes a substrate. This is drawn at the same angle as the housing. The two planar antennas 89 and 91 are for antenna diversity, but need not be two in particular. Two or more may be sufficient.

  Since the substrate 90 is covered with a conductor and radio waves are blocked, the antenna is installed at an angle perpendicular to the substrate surface or an angle corresponding to the substrate 90 so that the direction in which the electric field strength of the antenna is strong is not blocked by the substrate 90. Specifically, in the case of the illustrated planar antennas 89 and 91, the traveling direction of the radio wave indicated by the arrow is prevented from being hindered by the substrate. Similarly, since conductors are often used for the surfaces of switches and connectors, antennas are arranged so that the direction of the arrow does not come to this surface. The arrangement of the antenna is the same for the AV data receiving apparatus, and it is desirable to install the antenna so that the effective direction of the antenna is not blocked by a board, a connector, a switch, or the like.

  FIG. 12 shows an example of a block diagram of the AV data receiving apparatus of the present invention. Reference numeral 101 denotes an antenna that actually transmits and receives radio. An RF unit 102 includes radio-specific circuits such as up-conversion to a radio frequency, down-conversion from a radio frequency to a frequency that can be handled by a digital circuit, and an amplifier circuit. A modulation / demodulation unit 103 modulates / demodulates data. A communication control unit 104 performs communication control for transmitting AV data and transmitting / receiving control commands and asynchronous data. Reference numerals 101 to 104 constitute the wireless communication unit 111. Reference numeral 105 denotes an encoding unit that decompresses AV data input from the communication control unit 104. Although not shown, reference numeral 106 denotes a video output unit for connecting to an AV data display / playback apparatus including external devices such as a display device, a video recording device, and a flat panel display such as a liquid crystal television. Reference numeral 107 denotes a RAM used as a working area by the CPU. A ROM 108 stores programs and tables used by the CPU. Reference numeral 109 denotes a CPU that performs overall control. An IR command input unit 110 receives an optical operation command sent from an external device or a remote controller.

  FIG. 13 shows an implementation example of the AV data receiving apparatus of the present invention. Reference numeral 121 denotes an AV data receiving apparatus main body, and reference numeral 122 denotes an external infrared ray that can be moved within the range of the connecting line by inserting a plug 122a at the tip of the connecting line into a connector (not shown) of the AV data receiving apparatus main body. It is a light receiving part.

  FIG. 14 shows a case where the AV data receiving device main body is attached to the back surface of the display device of a flat panel display such as a liquid crystal television. Reference numeral 128 denotes a display device comprising a liquid crystal television, and 132 denotes an infrared remote control transmitter. The AV data receiver 121 ′ is attached by inserting a hook 125 on the back of the liquid crystal television into the attachment hole 124. The attachment hole 124 and the hook 125 can be replaced by any other attachment mechanism. In this case, since the AV data receiving device 121 ′ is attached to the rear surface of the display device 123, it is not possible to directly receive an infrared command from the remote control transmitter 132. Therefore, the infrared light receiving unit 122 is moved as shown in this figure so that it can be installed where it can be seen by the user, so that a command from the remote control transmitter 132 can be received. By setting the cable 122b of the infrared light receiving unit 122 to about 20 cm to 80 cm, the AV data receiving device 121 ′ attached to the back surface of the display device 123 can be connected to the external infrared light receiving unit terminal 127.

  The AV data receiving device 121 ′ and the display device 123 are connected by wire, and the infrared command signal received by the infrared light receiving unit 122 is not only processed in the display device 123 but also processed without being processed as it is. When sent to 121 ', it is possible to receive a remote control command by a user's remote control transmitter operation in front of the display device 123 and transmit it to the AV data transmission device without providing another infrared light receiving unit. Become.

  FIG. 15 shows another embodiment in which the AV data receiving device of the present invention is attached to the rear surface of the display device. Reference numeral 131 denotes a reflecting mirror that reflects infrared light. When the AV data receiving device 121 ′ is installed on the back surface of the display device 123, it cannot receive infrared light directly from the front surface of the display device. However, by installing the reflecting mirror 131, the AV data receiving device 121 ′ is installed on the back surface of the display device 123. Infrared light also reaches the attached AV data receiver main body light receiving unit 126, and direct control by the remote control transmitter 132 from the front surface of the display device 123 becomes possible.

  Returning to FIG. 14, the display device 123 is provided with a holding mechanism on the top surface of the AV data display / playback device (display device) 123 that can detachably hold the external infrared light receiving unit 122. As a result, the user can easily and reliably attach and remove the external infrared light receiving unit to / from the AV data display / reproduction device side (display device) 123.

As another embodiment, a case where an external antenna interface is attached to an AV data receiving apparatus or AV data transmitting apparatus will be described. The external antenna can communicate over a wider range by attaching a high-performance antenna outside the apparatus. AV data transmitter, AV
When both data receivers are fixed, it is possible to transmit AV data between rooms in a larger house by using a highly directional external antenna and adjusting the direction. Further, when radio waves are difficult to reach on a concrete wall such as a condominium, a high-performance AV data communication system (the combination shown in FIG. 1) can be realized by replacing the antenna with one having a high gain. This antenna interface disables the antenna 101 of FIG. 12 and enables the external antenna.

  In FIG. 14, reference numeral 95 denotes an external antenna, 96 denotes an external antenna connection terminal, and 97 denotes an external antenna mounting portion provided in the display device 123. In this way, it is possible to easily achieve reception performance corresponding to the radio wave condition of the user. The external antenna 95 may be installed in the AV data receiving apparatus 121. Further, it may be installed separately from the display device 123 using a stand or the like.

  An overview of the AV data receiving apparatus of the present invention is shown in FIG. FIG. 16A is a front view of the AV data receiving device, FIG. 16B is a back view of the AV data receiving device, and FIG. 16C is a diagram showing a substrate and an antenna built in the AV data receiving device. Reference numeral 141 denotes a power button. Reference numeral 142 denotes a control switch on the AV data transmitting apparatus side. For example, it corresponds to switches such as power supply, input switching, channel selection (forward, reverse), rewind, fast forward, playback, and stop. Reference numeral 143 denotes a factory adjustment terminal, which is used for ROM rewriting, self-checking and reception error status monitoring.

  An AV output terminal 144 is connected to an AV data display / playback apparatus. Reference numeral 145 denotes an infrared light receiving unit connection terminal for connecting an externally connected light receiving unit. Reference numeral 146 denotes an external antenna connection terminal. Reference numeral 147 denotes a video controller setting switch. Reference numeral 148 denotes a power connector, and reference numeral 149 denotes an infrared light receiving unit. Reference numeral 150 denotes a reception level lamp which is lit green when receiving normally and red when receiving abnormally. Whether there is an abnormality is a method of estimating the frequency of error by counting the number of error corrections of an error correction code (for example, Reed-Solomon code), the number of retransmissions of an erroneous packet, etc. on the receiving side. If AV data communication is not performed, the light may be turned off. A power lamp 151 is turned on when the power is on.

  Reference numerals 152, 153, and 154 are schematic views of a substrate and an antenna contained in the housing of the AV data receiving apparatus. Reference numerals 152 and 153 denote antennas, and reference numeral 154 denotes a substrate. The antenna 153 is set so that the arrow direction has the maximum sensitivity. As shown in FIG. 16, the infrared light receiving unit connection terminal 145 and the external antenna connection terminal 146 are arranged in the vicinity of the same surface, thereby facilitating the external attachment of the two attached devices of the external antenna 95 and the infrared light receiving unit 122.

  FIG. 17 shows a structure in which the infrared light receiving unit 161 and the external antenna 162 are integrated, and both the infrared light receiving unit and the antenna can be fixed simultaneously.

  The switch 142 in FIG. 16 generates a command for controlling the AV data output device on the AV data transmission device side. This command is wirelessly sent to the AV data transmission device, and the AV data transmission device converts the command into a control command for the AV data output device, which is an external device, and transfers it to the AV data output device. This command may be the same as the command transmitted from the infrared remote control transmitter. By attaching this switch 142 to the AV data receiving device, it is possible to control the function of the AV data output device with this switch 142 without carrying a remote control transmitter.

  If the command from the switch 142 or the control data from the remote control transmitter 132 is interpreted inside the apparatus, and if necessary, conversion of the command or determination of whether or not the command can be transferred is made, the video output apparatus can be more flexible. It becomes controllable. The control flow in this case is basically the same as in FIGS. However, in this case, step 61 in FIG. 9 or step 71 in FIG. 10 is command reception by infrared rays, and step 63 in FIG. 9 or step 74 in FIG. 10 is command transmission by radio.

  It is desirable that the table for performing the above-described command conversion and transferability determination can be set from the outside. That is, by changing the table, it becomes possible for the user to appropriately set a command to be output to the video output device according to the type and manufacturer of the output device. When this command conversion and conversion table are used, the following flow () is the contents of the control command.

1. The remote control sends a general command (playback).
2. In the AV data receiving device, the video output device holds a video conversion table of S company.
3. The (reproduction) command received by infrared rays is converted into a command (S company video reproduction) and sent to the AV data transmission apparatus by radio.
4). The AV data transmitting apparatus transmits a command (S company video playback) as an infrared command from the wireless section.

  By changing the conversion table, it becomes possible to change the part of (reproduction)-> (S company video reproduction) and convert (reproduction)-> (P company DVD reproduction). As a result, even if a user purchases a different video output device from a different manufacturer, the control command can be changed accordingly.

  As an embodiment of the present invention, as shown in FIG. 16, the planar antennas 152 and 153 are arranged so that there is no switch, no board, and no connector in the direction in which the maximum gain is obtained. Further, when the antenna is fixed to the display device, the antenna is arranged so that the direction of the maximum gain of the antenna does not come to the housing surface of the display device. This makes it possible to efficiently transmit and receive radio waves by reducing the interference of conductors that block radio waves as much as possible.

  As shown in FIG. 16, it is installed so that the surface of the switch 142 faces upward. At this time, the antenna surface is perpendicular to the ground, and the maximum gain surface is parallel to the ground. When this device is mounted on a display device, the device is installed with the power button 141 facing up or down. That is, even when fixed to the display device, it is installed so that the maximum gain surface faces in the horizontal direction with respect to the ground. As a result, the AV data receiving apparatus can prevent the performance of the antenna from being impaired regardless of whether the AV data receiving apparatus is installed in a normal manner or mounted on a display device.

  Next, FIGS. 18 to 23 show a power supply-related embodiment which is an example of the present invention. Among them, reference numeral 302 in FIG. 18 denotes a display device (here, a flat panel display such as a liquid crystal television), which is attached to a base 305 that can sufficiently withstand the load and a mounting plate 303 that can sufficiently withstand the load of the display and the AV data receiving device. Yes. These are firmly fixed and can be easily carried by the grip portion 304.

  The mounting plate 303 is provided with a screw hole 331 for fixing the AV data receiving device mounting means 313 and the AV data receiving device. Further, the display device side power / signal relay means 314 of the protruding shape provided in the display device and the similarly protruding connection detection means 312 are exposed. On the other hand, the AV data receiver 301 includes an antenna 306, an operation unit 307, a fixing screw 330 for fixing the AV data receiver to the display device, and a concave AV data receiver side power / signal relay unit 315 on the back side. 307 is provided on the back.

  The power of the display device is supplied from an AC power source through an AC plug 326 and an AC adapter 325. The display device side power / signal relay means 314 includes a signal GND terminal 316, a video signal terminal 317, a left audio signal terminal 318, a right audio signal terminal 319, a power supply GND terminal 320, and a power output terminal 321 for receiving AV data. The apparatus-side power / signal relay means 315 includes a signal GND terminal 361, a video signal terminal 362, a left audio signal terminal 363, a right audio signal terminal 365, a power supply GND terminal 366, and a power terminal 367 in the order corresponding to this. Yes.

  The lower part of the AV data receiving apparatus 301 is fixed by the AV data receiving apparatus attaching means 313, and the upper part is fixed to the screw hole 331 by the fixing screw 330. At this time, the convex display device side power / signal relay means 314 and the concave AV data reception device side power / signal relay means 315 are engaged, and the display device side signal terminals and power supply terminals (316 to 321) receive AV data respectively. It is simply and accurately connected to the corresponding terminals (361 to 367) of the apparatus-side power / signal relay means 315. In this way, it is possible to easily fix the AV data receiving device 301 to the display device 302. Furthermore, since necessary wiring can be performed at the same time, it is possible to reduce the labor required for wiring by the user, to prevent mistakes in wiring waiting, to reduce costs due to the absence of unnecessary wiring, and to provide good appearance.

  By the way, the AV data receiving device 301 may also have a function of supplying power from an AC adapter or the like as with the display device 302, but it is necessary to provide two AC adapters, more outlets are required, and wiring is increased. There are problems such as poor appearance.

  In this embodiment, since the power supply GND terminal 320 and the power supply input / output terminal 321 of the display device side power / signal relay means 314 and the corresponding power supply GND terminal 366 and power supply terminal 367 are provided on the AV data receiving device side, Power can be supplied from the display device 302 to the AV data receiving device 301 through these terminals, and it is not necessary to separately provide power supply means such as an AC adapter on the AV data receiving device side. This connected state is shown in FIG.

  Furthermore, in this embodiment, the power is output from the power input / output terminal 321 only when the connection detecting unit 312 is pushed by attaching the AV data receiving device. Therefore, when the AV data receiving apparatus 301 is not attached, it is possible to prevent the power output / GND from being short-circuited due to metal contact with the power input / output terminal 321 or the like. Note that the control itself, such as supplying power only when the detection means performs some detection, is a normal technique, and thus details are not described. In this embodiment, the display device 302 is a flat panel display. However, this does not limit the present invention, and a CRT display or the like may be used.

  FIG. 20 shows an embodiment in the case of using a battery. Reference numeral 340 denotes a battery (battery). The battery 340 includes a connection terminal 341 for connecting to an external device on the bottom surface of the battery, and an end is opened at a side portion. It has a fitting projection 342. The AV data receiving device 301 is provided with a connection terminal 345 for connection to a battery 340, and has a fitting recess 346 that is open at the back. The fitting convex part 342 of the battery 340 engages with the fitting concave part 346 of the AV data receiving device 301 and is fixed. The battery connection terminal 341 is connected to and integrated with the battery connection terminal 345 to form the battery-equipped AV data receiver 350 of FIG. The battery-equipped AV data receiving device 350 can also be supplied with power from the outside via an AC plug 352 and an AC adapter 351. This power is used as driving power for the AV data receiver with battery. Therefore, the battery-equipped AV data receiving device 350 can be driven by either AC or batteries. Further, when the battery (battery) can be charged, the battery can be charged with the power supplied from the AC.

  As shown in FIG. 22, the battery-equipped AV data receiving device 350 has a recess 359 on the back surface. Therefore, even if it is attached to the display device 302, the connection detecting means 312 is not pushed. Then, the power input / output terminal 321 becomes a power input terminal. A terminal corresponding to the power input / output terminal 321 of the AV data receiver 350 with battery is a power output terminal, and power is supplied to the display device.

  As a result, the AV data receiving device, the display device, and the battery as the power source are integrated and operate without power supply from the outside. Moreover, since AV data is also transmitted wirelessly, it becomes a complete wireless display device 360 that is not connected to the outside by an AC or DC power line or antenna line, and the entire device can be freely carried by the grip portion 304. Become.

  If the AV data receiving device 301 can supply power to the display device even if it does not have a battery unit, the AV data receiving device and the display device are passed through the AC plug 326 ′ and the AC adapter 325 ′ of FIG. Power can be supplied to the display device, and the AV adapter or the like on the display device side can be eliminated, and all power can be supplied with one AC.

  As shown in FIG. 23, the AV data receiving device side power / signal relay means 315 ′ includes a power / charge input terminal 368, and the display device side power / signal relay means 314 ′ includes a power / charge output terminal 322. The AV data receiving device with battery 350 can be driven and charged from the power supplied to the display device 302 through the AC plug 326 and the AC adapter 325. Note that the charging mechanism and the like are techniques widely used in PCs (personal computers) and the like, so details are not described.

  The complete wireless display device 360 shown in FIG. 22 or the AV data receiving device 3 shown in FIG. 1 and the AV data display / playback device 4 are integrated in the present embodiment by a plurality of devices incorporated by the user. However, the AV data receiving device or the battery may be built in the display device in advance, and similarly, the AV data transmitting device shown in FIG. 1 may be used as an AV device built in the AV data display / playback device.

  FIG. 24 shows a block diagram of an example of the present invention. Reference numeral 201 denotes an antenna that actually transmits and receives radio. Reference numeral 202 denotes an RF unit that includes radio-specific circuits such as up-conversion to a radio frequency, down-conversion from a radio frequency to a frequency that can be handled by a digital circuit, and an amplifier circuit. A modulation / demodulation unit 203 modulates / demodulates data. A communication control unit 204 performs communication control for transmitting video data and transmitting / receiving control commands and asynchronous data. Reference numeral 205 denotes a decoder unit that decompresses video data input from the communication control unit 204. Reference numeral 206 denotes a video output unit for connection to an external device (not shown) (for example, a display device, a video recording device, etc.). A RAM 207 is used as a working area by the CPU.

  A ROM 208 stores programs and tables used by the CPU. A CPU 209 performs overall control. An IP application execution unit 210 executes Internet protocol-related protocol processing and Internet applications. An IP application display unit 211 generates an Internet application screen. The display created here is displayed through an image output unit 206 on an external display device. Reference numeral 212 denotes an operation input unit. In this case, both an input to the Internet application and an apparatus control command on the AV data transmitting apparatus side are performed through this.

  Details of the header determination unit 213 which is a feature of the invention will be described below. In the header determination, it is necessary to identify whether the data packet to be transmitted / received is AV data, an AV-related device control command, or an Internet protocol (IP) packet. In the case of AV data, data is sent to the decoder, and in the case of an AV device control command, it is interpreted and processed as a control command, and IP-related packets (including address analysis protocols) must be IP-related. There is.

  For this identification, the present invention uses an IEEE 802.2 format packet format. FIG. 25 shows a packet format of IEEE 802.2 format in (a). In (b), the format of the SNAP protocol packet format generally used in the 802.2 format is described. The SNAP format is one method for implementing the 802.2 format. Here, in IP, 0800 (hexadecimal) is entered in the Type field. As AV data, for example, Type = A000 (hexadecimal) and AV control data may be Type = A001 (hexadecimal). The AV control data may be, for example, an AV / C command used for controlling an AV device in IEEE 1894, or a home-made cooperative format command used for an infrared remote controller in Japan. It is also possible to apply separate type fields to both. For AV data, it is conceivable to use a format defined by IEC61883.

  In IEC61883, a timer is provided internally, and output can be performed in synchronization with the clock at the output stage. As in the present invention, a packet header determination unit is provided, and the packet header uses the IEEE 802.2 format and the SNAP protocol format so that only the Type field can be identified even in the case of PC software that has conventionally handled the IP protocol. This makes it possible to distinguish between IP protocol and AV-related data and commands, and the reception side has a packet header determination unit that interprets this format, so that IP and AV data can be easily classified and received. The apparatus can be simply configured.

  Furthermore, it connects to an access point (AP) that is a source of IP packets as a connection destination of the Internet protocol. For video sources, AV data source and speed different from AP, presence / absence of error correction, delay acknowledgement FIG. 26 shows an embodiment of an AV data receiving apparatus in which AV data is received from an AV data source by performing negotiation such as the presence or absence of data.

  Here, 381 is an AV data receiving device, and 382 is an AV data transmitting device. The AV data display / playback device and AV data output device are not shown. Reference numeral 383 denotes an IP data transmitting / receiving apparatus that transmits and receives Internet-related packets. 383 is connected to the Internet (IP network) of 384. For example, in the wireless LAN protocol of IEEE802.11, in a wireless network connected to an external network through an access point, devices in the network can only exchange data with the access point. In the case of an IP network, this is not a problem because it is connected to the outside world through an AP.

  However, when the video source is a mechanism other than the IP network (for example, video in a house), the video data cannot be transmitted via the AP because the AP and the video are not connected. In this case, the AV data receiving apparatus directly exchanges AV data with the video source after adjusting the band with the video source or the node that performs the band adjustment. Therefore, the AV data receiving apparatus 381 transmits / receives Internet-related data to / from the access point, and for video, by connecting to the AV data transmitting apparatus, both the Internet application and the AV data application are realized. It becomes possible.

  The AV data receiving device and the AV data display / playback device have been described as separate devices. However, the AV data receiving device and the AV data display / playback device are integrated to realize a wireless AV data display / playback device. Then, it is possible to realize an apparatus that can enjoy AV data wirelessly at any time without connecting an AV data receiving apparatus later.

  Further, although the AV data transmission device and the AV data output device have been described as separate devices, the AV data transmission device can be realized by integrating the AV data transmission device and the AV data output device as a wireless AV data output device. Thus, an apparatus capable of transmitting AV data at any time through wireless communication without connecting to the device can be realized.

1 shows a diagram of the overall system of the present invention. The block diagram of the transmission basic part of AV data transmitter is shown. The conceptual diagram of the sequence of a packet is shown. The packet sequence conceptual diagram of another Example is shown. An image quality setting switch is shown. The block diagram of the transmission basic part of the AV data transmitter of another Example is shown. A channel switch is shown. The block diagram of the transmission basic part of the AV data transmitter of another Example is shown. FIG. 9 shows a flowchart when the AV data transmission apparatus of FIG. 8 transfers a control command to the AV data output apparatus. FIG. 7 shows another flowchart when the AV data transmission apparatus transfers data to the AV data output apparatus. An implementation example of an AV data transmission apparatus will be shown. The block diagram of AV data receiver is shown. An AV data receiver and a light receiving unit are shown. The case where an AV data receiver is attached to the back of the liquid crystal television is shown. Another embodiment when an AV data receiving device is attached to the back of the display device will be described. An overview diagram of an AV data receiving apparatus is shown. An embodiment in the case where the infrared light receiving unit and the antenna are integrated will be described. The figure for demonstrating the connection of AV data receiver and a display apparatus is shown. The connection state figure of AV data receiver and a display apparatus is shown. The figure for sharpening the connection of AV data receiver and a battery (battery) is shown. The connection state figure of AV data receiver and a battery (battery) is shown. The figure for demonstrating the connection of AV data receiver with a battery is shown. The figure for demonstrating the connection of a display apparatus and AV data receiver with a battery is shown. The block diagram of the apparatus which transmits V data and IP data simultaneously is shown. The packet format of IEEE802.2 format is shown. The figure explaining the relationship between AV data receiver, AV data transmitter, IP data transmitter / receiver, and a network is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 AV data output device 2 AV data transmitter 3 AV data receiver 4 AV data display / playback device 5, 122b Cable 11 Video input part 12 Encoding part 13 Communication control part 20 Quality change setting part 21 Basic transmission part 31 AV data transmission All sections 32 AV data transmission main section 33 AV data retransmission section 34 AV data transmission all sections 35 AV data retransmission section 36 AV data transmission all sections 37 AV data retransmission section 38 AV data transmission all sections 41 Quality setting switches 42, 142 Switch 81 Factory shipping terminal 82 AV output terminal 83 AV input terminal 89 Planar antenna 90 Substrate 95 External antenna 101, 306 Antenna 104 Communication control unit 111 Wireless communication unit 121, 121 'AV data receiving device 122a Plug 122 External infrared light receiving unit 122 Light receiving unit 123 Display device 124 Mounting hole 125 Hook 126 AV data receiver main body light receiving unit 127 External infrared light receiving unit terminal 131 Reflector 132 Remote control transmitter 141 Power button 145 Infrared light receiving unit connection terminal 146 External antenna connection terminal 152 Planar antenna 161 Infrared light receiving unit 162 External Antenna 204 Communication Control Unit 213 Header Determination Unit 301 AV Data Receiving Device 302 Display Device 303 Mounting Plate 304 Grip Unit 305 Base 307 Operation Unit 312 Connection Detection Unit 313 AV Data Reception Device Mounting Unit 314 Display Device Side Power / Signal Relay Unit 315 AV data receiver side power / signal relay means 316, 361 Signal GND terminal 317 Video signal terminal 318 Left audio signal terminal 319 Right audio signal terminal 320 terminal 321 Power input / output terminal 321 Power output terminal 22 Power / Charge Output Terminals 325, 325 ′, 351 AC Adapter 326, 326 ′, 352 AC Plug 331 Screw Hole 340 Battery 341 Connection Terminal 342 Fitting Protrusion 345 Connection Terminal 346 Fitting Recess 350 Data Receiver 360 Full Wireless Display Device 362 Video signal terminal 363 Left audio signal terminal 365 Right audio signal terminal 366 Power supply GND terminal 367 Power terminal 368 Power / Charge input terminal

Claims (2)

An AV data receiving device that receives AV data by radio waves and transmits a command,
The AV data quality, the amount of AV data, and the channel used for radio waves can be changed according to the communication error situation related to the reception of the AV data, and a command for requesting any of these changes is provided. Transmitting to the AV data transmitting device communicating with the AV data receiving device by radio waves,
The user can set either one or both of the change of the quality of the AV data or the data amount of the AV data, or the change of the channel used for radio, and the setting of the change. As a command to the AV data transmission device by radio waves,
A control command receiving unit for receiving a control command for controlling the AV data output device connected to the AV data transmitting device from another external device;
The control command receiving unit performs predetermined conversion on the received control command and outputs the command, and when the predetermined conversion cannot be performed, outputs the received control command as the command. An AV data receiving apparatus capable of transmitting an output command to the AV data transmitting apparatus by radio waves . The AV data receiving device according to claim 1,
The AV data receiving apparatus, wherein the control command for controlling the AV data output apparatus corresponds to a switch provided in a main body of the AV data receiving apparatus.

Images