JP2006270690A - Data transmission system - Google Patents

Data transmission system Download PDF

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Publication number
JP2006270690A
JP2006270690A JP2005087784A JP2005087784A JP2006270690A JP 2006270690 A JP2006270690 A JP 2006270690A JP 2005087784 A JP2005087784 A JP 2005087784A JP 2005087784 A JP2005087784 A JP 2005087784A JP 2006270690 A JP2006270690 A JP 2006270690A
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Prior art keywords
resolution
means
data
video data
output means
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JP2005087784A
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Japanese (ja)
Inventor
Satoshi Hirooka
諭 広岡
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Funai Electric Co Ltd
船井電機株式会社
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Priority to JP2005087784A priority Critical patent/JP2006270690A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a data transmission system for transmitting video data at a high bit rate through a radio transmission path, and especially for transmitting video data whose resolution is the optimal to a plurality of output means whose resolutions are different. <P>SOLUTION: This data transmission system is provided with a content providing means for storing video data having predetermined resolution, server equipment to which video data are provided from the content providing means, a plurality of client equipment communicatively connected through a transmission path to the server equipment and an output means installed as a pair with each of the plurality of client equipment. The server equipment is provided with a resolution converting means for simultaneously converting the resolution of video data into two or more predetermined resolutions and a resolution control means for controlling the resolution converting means. The resolution control means controls the resolution converting means based on the resolution of the output means which has requested the video data. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a data transmission system capable of transmitting high-bit-rate video data and the like via a wireless transmission path, and in particular, can transmit video data having an optimal resolution to each of a plurality of output means having different resolutions. The present invention relates to a data transmission system.

  In recent years, DVD recorders, HDD recorders, and personal computers are remarkably widespread, and accordingly, video assets that individuals can view at home have increased. In addition, it is required to enjoy contents such as video information stored on a DVD / HDD recorder or a personal computer at a place where the user wants to view the content, and a client such as a television or a personal computer using a home network. Technologies that enable output to equipment have been proposed. As a technique for transmitting a large amount of data such as video data and audio data at high speed and in real time, for example, IEEE 1394 is adopted as a connection interface for digital television, digital video, and the like.

  Recently, in order to simplify the connection between devices, a DVD / HDD recorder, a personal computer, a liquid crystal monitor, and the like can be connected using a wireless LAN. As a typical technique of this wireless LAN, there is IEEE 802.11 standardized by IEEE, and the one using the 2.4 GHz band is the mainstream. The 2.4 GHz band is called an ISM (Industrial, Scientific and Medical) band, and is a frequency band used for industrial, medical, and household microwave ovens. In Japan, 2.400-2.497 GHz is a wireless LAN Assigned to.

  The data transmission system using the wireless LAN described above connects, for example, an AV source device (content providing unit) such as a DVD / HDD recorder and a server device, and connects an output unit such as a liquid crystal monitor and a client device. Configured to transmit data such as video data by wireless communication between the server device and the client device.

  In such a data transmission system, when transmitting video data from the content providing means to the output means via the server device, a technique for converting the resolution of the video data to the resolution of the output means and transmitting has been proposed.

  For example, in Patent Document 1, when there is a request for a medical image from each medical diagnosis support terminal whose specifications such as the resolution of a medical image monitor, processing speed, memory capacity, and transfer rate of a connected network are not constant, The medical diagnosis support server discloses a technique in which an image obtained by converting a medical image so as to conform to resource information indicating these specifications is generated and transmitted.

  Patent Document 2 discloses a technique for determining whether or not the video resolution of the video output device and the video resolution of the receiving terminal match, and adding a resolution conversion process if they do not match. .

Also, in Patent Document 3, the server unit holds videos of the same content and different image quality, and image quality management means for switching the image quality of the video provided by the host unit and video transmission management means for instructing video transmission. A technique is disclosed in which the terminal unit includes a monitor that outputs video provided from the host unit, and a monitor performance holding unit that holds performance such as the resolution of the monitor.
JP 2004-164357 A JP 2003-46977 A JP-A-8-265722

  However, the prior application technique is effective when the resolution of video data is converted and transmitted in accordance with the resolution of one output means, but the same video data is transmitted to output means with two or more different resolutions. It is not optimal for That is, in the case of having a plurality of output means, it is considered that the resolution is converted based on the resolution of any one of the output means, and in other output means, the display screen is displayed smaller than the screen size. There is a possibility that a problem of being displayed outside the display range may occur.

  The present invention relates to a data transmission system capable of transmitting high-bit-rate video data and the like via a wireless transmission path, and in particular, can transmit video data having an optimal resolution to each of a plurality of output means having different resolutions. An object is to provide a data transmission system.

  The present invention has been made in order to solve the above-described problems, and provides a content providing unit storing video data having a predetermined resolution, a server device provided with video data from the content providing unit, and the server In a data transmission system comprising a plurality of client devices communicably connected to a device via a transmission path, and output means provided on a one-to-one basis with the plurality of client devices, the server device is configured as described above. A resolution conversion unit capable of simultaneously converting the resolution of the video data into two or more predetermined resolutions; and a resolution control unit for controlling the resolution conversion unit, wherein the resolution control unit outputs the video data. The resolution conversion means is controlled on the basis of the resolution.

  The server device includes resolution storage means for storing resolution data of the plurality of output means, and the resolution control means receives resolution data corresponding to the output means that has requested video data from the resolution storage means. The resolution conversion means is controlled based on the readout. Thus, the video data converted to the optimum resolution can be supplied to the output means that has requested the video data. In addition, since it is only necessary to set an optimal resolution once for the output means, the burden associated with the user's resolution setting can be reduced.

  The server device includes a resolution data acquisition unit that acquires a resolution of an output unit connected to the client device. The resolution data acquisition unit receives the resolution data transmitted from the client device and receives the resolution data. Stored in the resolution storage means. For example, on the client device side, the resolution data input from the client device is transmitted to the server device based on the user performing an input operation of the resolution of the output means connected to the client device using the remote control device. To be.

  Further, the resolution control means reads resolution data corresponding to the output means that has requested the video data from the resolution storage means, and if it is impossible to control the resolution conversion means based on all of the resolution data, the resolution control means The resolution data is read out in order from the lowest, and the resolution conversion means is controlled based on this. As a result, even if it is not possible to convert to the optimal resolution for all output means and send it, the screen size of the received video data will be larger than the screen size of the output means, and it will not be possible to display everything Can be avoided. In other words, the resolution conversion means may be provided in accordance with the number of client devices connected to the server device, but it is not desirable to increase the number of resolution conversion means in terms of the structure of the apparatus or the cost. In order to minimize the problems that occur in such cases.

  According to the present invention, a content providing unit storing video data having a predetermined resolution, a server device to which video data is provided from the content providing unit, and a server device are communicably connected to each other via a transmission path. In a data transmission system composed of a plurality of client devices and a plurality of client devices and one-to-one output means, the server device can simultaneously convert the resolution of video data to two or more predetermined resolutions. A resolution conversion means and a resolution control means for controlling the resolution conversion means, and the resolution control means controls the resolution conversion means based on the resolution of the output means that has requested the video data. Even when video data is transmitted simultaneously to the output means, the video data converted to the optimum resolution is provided for each output means. It can be. In addition, since the video data is transmitted after being converted to the optimum resolution for each output means, the amount of data is reduced when the resolution is low, and the load on the transmission path is reduced.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a data transmission system according to the present embodiment.

  The data transmission system 100 according to the present embodiment includes a content providing device 10 that stores video data having a predetermined resolution (XGA), a server device 20 that is provided with video data from the content providing device 10, and a server device 20 And a plurality of client devices 30a and 30b that are communicably connected via a wireless transmission path, and a plurality of client devices 30a and 30b and output devices 40a and 40b such as a liquid crystal monitor provided one-on-one. The In this embodiment, two client devices 30a and 30b are connected to the server device 20 so as to be communicable using a 2.4 GHz band wireless LAN (compliant with IEEE802.11g). The resolutions of the output devices 40a and 40b are VGA (800 × 600 pixels) and SXGA (1280 × 1024 pixels), respectively.

  In the data transmission system 100, for example, the content providing device 10 and the server device 20 are connected by a predetermined cable, and analog video data is supplied from the content providing device 10 to the server device 20. Then, the digital video data whose resolution is converted in accordance with the resolution of the output devices 40a and 40b in the server device 20 is transmitted to the client devices 20a and 20b. The client devices 30a and 30b are controlled based on input operations from the remote control devices 50a and 50b.

  For example, it is assumed that the content providing apparatus 10 stores digital video data having a resolution of XGA (1024 × 728 pixels). In addition, the content providing apparatus 10 includes an AV data generation unit (not shown), reads video data from a recording medium such as a hard disk or a DVD, converts it into a predetermined format, and outputs it as analog video data.

  FIG. 2 is a schematic configuration diagram of the server device 20. As shown in FIG. 2, the server device 20 includes an A / D conversion unit 21, a resolution conversion unit 22, an MPEG encoder 23, a wireless LAN communication unit 24, a high frequency amplification unit 25, an antenna 26, and resolution control. A video data supplied from the content providing apparatus 10 to the client device 30 in the MPEG2-compliant transport stream format.

  The A / D converter 21 converts the analog video data transmitted from the content providing apparatus 10 into digital video data.

  The resolution conversion unit 22 includes a resolution conversion unit (A) 22a and a resolution conversion unit (B) 22b, and converts the digital video data supplied from the A / D conversion unit 21 into video data of two different resolutions simultaneously. Configured to be possible. The resolution conversion processing in the resolution conversion units 22a and 22b is controlled by a resolution control unit 27 described later.

  The MPEG encoder 22a compresses and encodes the digital video data supplied from the resolution converter (A) 22a in accordance with the MPEG2 system, and the MPEG encoder 22b converts the digital video data supplied from the resolution converter (B) 22b in accordance with the MPEG2 system. Compress and encode.

  The wireless LAN communication unit 24 performs protocol processing and modulation / demodulation processing on the digital video data output from the MPEG encoders 22a and 22b. The high frequency amplifying unit 25 amplifies the RF signal by high frequency and transmits the amplified RF signal to the client devices 30 a and 30 b via the antenna 26. For example, the RF signal is transmitted through a communication channel having a frequency band with a center frequency of 2.412 GHz.

  The resolution data storage unit 28 is composed of a nonvolatile memory or the like, and stores resolution data (VGA, SXGA) of the output devices 40a, 40b. As described above, since the resolution data is stored in the resolution data storage unit 28, the user only has to set an optimal resolution once in the output device 40, and an increase in the burden associated with the user's resolution setting can be avoided.

  The resolution control unit 27 controls the resolution conversion unit 22 based on the resolution of the output means 40a and 40b that has requested the video data. Specifically, the resolution data corresponding to the output means 40a or 40b that has requested the video data is read from the resolution data storage unit 28, and the resolution conversion units 22a and 22b are controlled based on this. For example, when there is a request for video data from the output devices 40a and 40b, the resolution conversion unit (A) 22a performs XGA → VGA resolution conversion, and the resolution conversion unit (B) 22b performs XGA → SXGA resolution conversion. Control to execute. Thus, the video data converted to the optimum resolution can be supplied to the output means that has requested the video data.

  If the resolution of the video data stored in the content providing device 10 and the resolution of the output device 40 are the same, it is not necessary to convert the resolution, so the resolution conversion processing in the resolution conversion unit 22 is omitted. When both the output devices 40a and 40b have the same resolution (for example, SXGA), only one resolution conversion unit (for example, the resolution conversion unit 22a) needs to execute the resolution conversion process. The resolution conversion process in the unit is omitted.

  The server control unit 29 includes a CPU, a RAM, and a ROM (not shown). Various control programs are stored in the ROM, and the CPU operates according to the control program in the ROM while using the RAM as a work area. For example, when the resolution data of the output devices 40a and 40b is transmitted from the client devices 30a and 30b, the server control unit 29 stores the respective resolution data in the resolution data storage unit 28 corresponding to the output devices 40a and 40b. Functions as a resolution data acquisition means.

  FIG. 3 is a schematic configuration diagram of the client device 30. The client devices 30a and 30b have the same configuration.

  As shown in FIG. 3, the client machine 30 includes an antenna 31, a high frequency amplification unit 32, a wireless LAN communication unit 33, an MPEG decoder 34, a D / A conversion unit 35, a remote control reception unit 36, and client control. And receives the digital video data transmitted from the server device 20 and outputs the digital video data to the output device 40.

  The antenna 31 receives the RF signal transmitted from the server device 20 via the communication channel, and supplies the received RF signal to the high frequency amplifier 32. The high frequency amplifier 32 amplifies the RF signal received by the antenna 31 at a high frequency and supplies the amplified RF signal to the wireless LAN communication unit 33. The wireless LAN communication unit 33 performs protocol processing and modulation / demodulation processing on the digital video data supplied from the high frequency amplification unit 32.

  The MPEG decoder 34 decompresses and decodes the digital AV data supplied from the wireless LAN communication unit 33. The D / A converter 35 performs analog conversion on the digital AV data supplied from the MPEG decoder 34 and outputs the analog AV data to the output device 40.

  The remote control receiving unit 36 receives a signal (for example, infrared rays) transmitted by the user operating the remote control device 50. The client control unit 37 includes a CPU, a RAM, and a ROM (not shown). Various control programs are stored in the ROM, and the CPU operates according to the control program in the ROM while using the RAM as a work area. For example, when the user performs an input operation of the resolution of the output device 40 connected to the client device 30 using the remote controller 50, the resolution data is transmitted to the server device 20.

  As described above, in this embodiment, the server device 20 includes the resolution converters 22a and 22b and the resolution converters 22a and 22b that can simultaneously convert the resolution of the video data into two predetermined resolutions (for example, VGA and SXGA). And the resolution control unit 27 controls the resolution conversion units 22a and 22b based on the resolution of the output unit that has requested the video data. Therefore, the optimal resolution for each output unit is provided. The video data converted into can be supplied. In addition, since the amount of data is reduced when the video data is converted to low resolution, such as when XGA video data is converted to VGA, the load on the wireless transmission path is reduced.

  As mentioned above, although the invention made by this inventor was concretely demonstrated based on embodiment, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.

  For example, in the above-described embodiment, the 2.4 GHz band wireless LAN defined in IEEE802.11g has been described, but other transmission technologies can also be used. For example, a 5.2 GHz band wireless LAN defined by IEEE 802.11a, a 2.4 GHz band wireless LAN defined by IEEE 802.11b, an optical wireless LAN, or the like can be used. Further, the present invention can be applied not only to wireless transmission technology but also to wired transmission technology.

  In the above embodiment, the system configuration in which the two client devices 30a and 30b are connected to the server device 20 has been described. However, a configuration in which three or more client devices are connected may be employed. In this case, if the server device is provided with a larger number of resolution conversion units than the number of connected client devices, the video data can be converted to the optimum resolution for all output devices. However, it is not desirable to increase the number of resolution conversion units in view of the structure of the apparatus or the cost.

  Therefore, when the number of client devices (that is, output devices) connected to the server device is larger than the number of resolution conversion units provided in the server device, resolution conversion that is optimal for all output devices is performed. In some cases, resolution data may be read in order from the lowest resolution, and the resolution conversion means may be controlled based on this. For example, if there are two resolution converters and there is a request for video data from an output device with a resolution of VGA, XGA, or SXGA, the video data is converted to VGA or XGA and converted to XGA for an SXGA output device. Transmitted video data. As a result, even if it is not possible to convert to the optimal resolution for all output means and send it, the screen size of the received video data will be larger than the screen size of the output means, and it will not be possible to display everything Can be avoided.

It is a schematic block diagram of the data transmission system of this embodiment. 2 is a schematic configuration diagram of a server device 20. FIG. 2 is a schematic configuration diagram of a client device 30. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Content provision apparatus 20 Server apparatus 21 A / D conversion part 22 Resolution conversion part 23 MPEG encoder 24 Wireless LAN communication part 25 High frequency amplification part 26 Antenna 27 Resolution control part 28 Resolution data storage part 29 Server control part 30 Client apparatus 31 Antenna 32 High-frequency amplification unit 33 Wireless LAN communication unit 34 MPEG decoder 35 D / A conversion unit 36 Remote control reception unit 37 Client control unit 40 Output device 50 Remote control device

Claims (6)

  1. Content providing means for storing video data having a predetermined resolution;
    A server device provided with video data from the content providing means;
    A plurality of client devices communicably connected to the server device via a transmission path;
    In a data transmission system comprising the plurality of client devices and output means provided on a one-to-one basis,
    The server device stores resolution conversion means capable of simultaneously converting the resolution of the video data into two or more predetermined resolutions, resolution control means for controlling the resolution conversion means, and resolution data of the plurality of output means. Resolution storage means, and resolution data acquisition means for acquiring the resolution of the output means connected to the client device,
    The resolution data acquisition means receives the resolution data transmitted from the client device and stores it in the resolution storage means,
    The resolution control means reads the resolution data corresponding to the output means that has requested the video data from the resolution storage means, and controls the resolution conversion means based on this,
    If the resolution data corresponding to the output means that has requested the video data is read from the resolution storage means, and it is impossible to control the resolution conversion means based on the data, the resolution data is obtained in order from the lowest resolution. A data transmission system for reading and controlling the resolution conversion means based on the readout.
  2. Content providing means for storing video data having a predetermined resolution;
    A server device provided with video data from the content providing means;
    A plurality of client devices communicably connected to the server device via a transmission path;
    In a data transmission system comprising the plurality of client devices and output means provided on a one-to-one basis,
    The server device includes resolution conversion means capable of simultaneously converting the resolution of the video data to two or more predetermined resolutions, and resolution control means for controlling the resolution conversion means,
    The data transmission system according to claim 1, wherein the resolution control means controls the resolution conversion means based on the resolution of the output means that has requested the video data.
  3. The server device has resolution storage means for storing resolution data of the plurality of output means,
    3. The data transmission system according to claim 2, wherein the resolution control means reads resolution data corresponding to an output means that has requested video data from the resolution storage means, and controls the resolution conversion means based on the resolution data.
  4. The server device has resolution data acquisition means for acquiring the resolution of the output means connected to the client device,
    4. The data transmission system according to claim 3, wherein the resolution data acquisition unit receives the resolution data transmitted from the client device and stores the resolution data in the resolution storage unit.
  5. The resolution control means reads resolution data corresponding to the output means that has requested the video data from the resolution storage means, and when the resolution conversion means cannot be controlled based on the data,
    5. The data transmission system according to claim 2, wherein resolution data is read in order from the lowest resolution, and the resolution conversion means is controlled based on the read resolution data.
  6. A video data transmitting device connected to content providing means storing video data having a predetermined resolution and provided with video data from the content providing means,
    A resolution conversion means capable of simultaneously converting the resolution of the video data to a predetermined resolution of 2 or more; and a resolution control means for controlling the resolution conversion means,
    The video data transmitting apparatus characterized in that the resolution control means controls the resolution conversion means based on the resolution of the output means that has requested video data.
JP2005087784A 2005-03-25 2005-03-25 Data transmission system Pending JP2006270690A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010508734A (en) * 2006-11-01 2010-03-18 スカイファイア ラブズ インコーポレイテッド An architecture for delivering video content in response to remote interaction
JP2010161675A (en) * 2009-01-09 2010-07-22 Fuji Xerox Co Ltd Apparatus and system for video signal distribution, and video signal transmission system
JP2011055189A (en) * 2009-09-01 2011-03-17 Canon Inc Content providing apparatus and content processing method
US8630512B2 (en) 2007-01-25 2014-01-14 Skyfire Labs, Inc. Dynamic client-server video tiling streaming
JP2014044655A (en) * 2012-08-28 2014-03-13 Premium Agency Inc Augmented reality system, video composition device, video composition method, and program
US8711929B2 (en) 2006-11-01 2014-04-29 Skyfire Labs, Inc. Network-based dynamic encoding
US9247260B1 (en) 2006-11-01 2016-01-26 Opera Software Ireland Limited Hybrid bitmap-mode encoding
JP2016065958A (en) * 2014-09-24 2016-04-28 ブラザー工業株式会社 Display control system, display control device, and program

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010508734A (en) * 2006-11-01 2010-03-18 スカイファイア ラブズ インコーポレイテッド An architecture for delivering video content in response to remote interaction
US9247260B1 (en) 2006-11-01 2016-01-26 Opera Software Ireland Limited Hybrid bitmap-mode encoding
US8443398B2 (en) 2006-11-01 2013-05-14 Skyfire Labs, Inc. Architecture for delivery of video content responsive to remote interaction
US8711929B2 (en) 2006-11-01 2014-04-29 Skyfire Labs, Inc. Network-based dynamic encoding
US8630512B2 (en) 2007-01-25 2014-01-14 Skyfire Labs, Inc. Dynamic client-server video tiling streaming
JP2010161675A (en) * 2009-01-09 2010-07-22 Fuji Xerox Co Ltd Apparatus and system for video signal distribution, and video signal transmission system
JP2011055189A (en) * 2009-09-01 2011-03-17 Canon Inc Content providing apparatus and content processing method
JP2014044655A (en) * 2012-08-28 2014-03-13 Premium Agency Inc Augmented reality system, video composition device, video composition method, and program
JP2016065958A (en) * 2014-09-24 2016-04-28 ブラザー工業株式会社 Display control system, display control device, and program

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