JP2008199111A - Digital broadcast receiving system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display video images outputted from a home digital broadcast receiver on an one-segment mobile receiver loaded with a high resolution display. <P>SOLUTION: When a TV viewing mode is started in the one-segment mobile receiver, a radio transmission/reception part confirms network connection with the home digital broadcast receiver and connects the one-segment mobile receiver. Further, a video size required to be received, a video format, a sound format, and information capable of specifying contents being viewed at present are transmitted, video transfer is requested and video images are displayed by a horizontal view (full screen view) or vertical view (video plus data) which is a viewing style of a mobile phone. If the digital broadcast receiver can not be detected on the network or the digital broadcast receiver can be detected but its tuner is used for another purpose, the video images are viewed by one-segment viewing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiving technique, and more particularly to a digital broadcast receiving system, a mobile terminal device, and a digital broadcast receiving device.

  Digital terrestrial television broadcasting adopts (1) high-quality video and audio compared to analog broadcasting, (2) OFDM (Orthogonal Frequency Division Multiplexing), which is strong against multipath, and is strong against ghost, (3) data High-definition broadcasting and data broadcasting services for stationary TVs are being implemented.

  In terrestrial digital television broadcasting, a broadcasting service for mobile receivers is possible due to the transmission standard, and a broadcasting service for mobile receivers (so-called 1-segment broadcasting) has also been started.

  In Japanese terrestrial digital television broadcasting, an ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) system is adopted in consideration of commonality between television broadcasting and audio broadcasting. In the ISDB-T system, hierarchical transmission by frequency division is performed in order to enable a mixture of programs for fixed reception and programs for mobile reception. That is, by dividing one channel (5.6 MHz band) into 13 segments, a plurality of broadcast services can be performed simultaneously. Of the 13 segments, the central one segment is used for transmission of various control signals, signals for data broadcasting, video / audio signals for received programs for movement, and the like. The other 12 segments are used for transmission of video / audio signals for programs for mobile reception. The broadcast service for mobile receivers is performed using one segment located in the center of the 13 segments, and the broadcast service for fixed reception is performed using all 13 segments.

  One segment refers to a mechanism for broadcasting a program (simple moving image) to a mobile terminal using radio waves of digital terrestrial broadcasting. One-segment broadcasting refers to simple video broadcasting using a strong hierarchy. Terrestrial digital broadcasting uses radio waves in the UHF band, and 6 MHz is assigned as one channel. This is divided into 13 segments for broadcasting. Of these, broadcasting is performed using “one segment” assigned to a strong mobile phone hierarchy, so it is called “one-segment broadcasting”.

  Various proposals have also been made regarding technologies related to one segment. For example, in Patent Document 1, a technique for receiving 12 segments at home, re-encoding to 1 segment, and transmitting to the terminal is disclosed in Patent Document 2, while a technique for viewing 1 segment data on a mobile terminal is disclosed in Patent Document 3, It is a technology that distributes the TS of one segment out of 13 segments received at home, and receives 1 segment data through direct wireless communication with devices equipped with a terrestrial digital tuner, connected to multiple terrestrial digital devices When doing so, it is described that a wireless communication with high sensitivity is selected. In addition, products such as Location Free (registered trademark) are also sold as products corresponding to sizes such as analog data and VGA for distributing programs to personal computers (PCs) and portable terminals via a wireless LAN.

JP 2005-197829 A, “Data receiving device and portable terminal device”: JP 2005-204064 A, “Program Recording Device, Portable Terminal Device, and Program” JP 2006-165934 A, “Digital Broadcasting System, Portable Terminal, and Digital Broadcasting Receiver”

  Since the above-mentioned Patent Document 1 displays a 12-segment signal after receiving it and converting it to a 1-segment format, there is no merit for improving the display quality. In the above-mentioned Patent Document 2, since the one-segment data is viewed on the mobile terminal, the display is based on the reception of one segment. That is, in the recorded content, when viewing with a mobile terminal, the 1-segment recording data is transmitted to the mobile phone, and QVGA is obtained. Since patent document 3 also distributes 1 segment data, it does not become display quality more than 1 segment data. That is, since the 1-segment TS is redistributed in the home, the data obtained is the same as the conventional one in that it is QVGA. Location free also does not mean that you can enjoy 1-segment data broadcasting.

  VGA-sized displays for mobile terminals are beginning to appear, but since the video size for 1-segment broadcasting for mobile terminals is QVGA, it is a VGA liquid crystal display device that uses dot-by-dot (Dot by dot). When viewing with Dot), there is a problem that the screen is left over, and when the full screen display is performed, the video is enlarged, resulting in a rough video. In addition, since it is difficult to receive one-segment radio waves in the home, there is a problem that it is difficult to obtain stable video and audio.

  An object of the present invention is to improve display quality in a one-segment receiver equipped with a high-resolution display. At the same time, it aims at making data broadcasting enjoyable.

  According to the present invention, 12 seg is received by a terrestrial digital tuner-equipped device in the home, scaled to VGA size, and distributed to the mobile phone. In the cellular phone, the data is displayed on the display unit together with the 1-segment received data broadcast.

  That is, according to one aspect of the present invention, a display unit that performs display based on digital broadcast, a first receiver that receives a first digital broadcast signal for a mobile receiver, and the first digital broadcast A second receiving unit that receives a second digital broadcast signal by communication from a digital broadcast receiving apparatus that can receive a higher-quality broadcast signal corresponding to the signal, the first digital broadcast signal, and the second digital broadcast signal There is provided a portable terminal device including a display control unit that performs display control on the display unit based on a digital broadcast signal. It is preferable that a request regarding display characteristics of the second digital broadcast signal is made to the digital broadcast receiving device via the second receiving unit. As the request, it is preferable to make a transmission request for a digital broadcast signal capable of displaying a high-quality video suitable for the display performance of the display unit.

  Also, the 1-seg digital signal is transmitted by communication from a display unit that performs display based on digital broadcasting, a first receiving unit that receives a 1-seg digital broadcast signal, and a terrestrial digital broadcast receiver that can receive the terrestrial digital broadcast signal. A second receiving unit that receives a terrestrial digital broadcast signal corresponding to the broadcast signal, and a display control unit that controls display on the display unit based on the one-segment digital broadcast signal and the terrestrial digital broadcast signal; , A portable terminal device is provided.

  A video / audio signal based on 12-segment terrestrial digital broadcasting is transferred indoors by transferring it from a digital broadcast receiver capable of receiving 12-segment terrestrial digital broadcast to a mobile terminal device capable of receiving 1-segment. However, high-quality terrestrial digital broadcasting can be viewed using a mobile terminal device. Here, if the display unit is a high-quality display in order to distribute the broadcast signal from the digital broadcast receiver in a display size in the display unit of the portable terminal device or a size optimal for the display mode (display size). Using this, you can watch beautifully with high quality. In addition, the 1-segment data broadcast acquired on the mobile terminal device side can be enjoyed at the same time. Since 1-segment data reception is basically only for data broadcasting, unnecessary reception can be reduced. For example, it is possible not to receive in the full screen mode. In this case, it can be confirmed in advance that the program is the same as the one-segment program. Examples of the confirmation method include a method of comparing EIT and NIT included in a broadcast TS, or transmitting program title information as text and searching for a program having the same title at the receiver. That is, it becomes possible by transmitting program information that can specify a program from a mobile phone.

  More specifically, 12 segs are received by a terrestrial digital tuner-equipped device in the home, scaled to VGA size, and distributed to the mobile terminal device. Display control is performed so as to be displayed together with the data broadcasting of the 1-segment reception of the mobile terminal device.

  According to another aspect of the present invention, communication between a terrestrial digital broadcast reception unit that receives a terrestrial digital broadcast signal and a mobile terminal device that includes a first reception unit that receives a 1-segment digital broadcast signal is performed. A terrestrial digital broadcast signal corresponding to the 1-segment digital broadcast signal and the terrestrial digital broadcast receiver, and transmitting the terrestrial digital broadcast signal to the portable terminal device via the communication unit. A terrestrial digital broadcast receiver is provided. It is preferable to have a video conversion unit that converts a video based on a terrestrial digital broadcast signal received by the terrestrial digital broadcast reception unit based on display characteristics requested from the portable terminal device via the communication unit.

  Also, the 1-seg digital signal is transmitted by communication from a display unit that performs display based on digital broadcasting, a first receiving unit that receives a 1-seg digital broadcast signal, and a terrestrial digital broadcast receiver that can receive the terrestrial digital broadcast signal. A second receiving unit that receives a terrestrial digital broadcast signal corresponding to the broadcast signal, a display control unit that performs display control on the display unit based on the one-segment digital broadcast signal and the terrestrial digital broadcast signal; A terrestrial digital broadcast receiving unit that receives a terrestrial digital broadcast signal, and a communication unit that performs communication with the portable terminal device, and corresponds to the one-segment digital broadcast signal. A digital terrestrial digital signal characterized in that a digital terrestrial broadcast signal is received by the digital terrestrial broadcast receiver and transmitted to the portable terminal device via the communication unit. Broadcast receiver and; may be a digital broadcast receiving system including. The mobile terminal device has a first communication interface unit connectable to the Internet, and the communication unit of the terrestrial digital broadcast receiving device communicates with the mobile terminal device via the Internet. . The first communication interface unit may be wirelessly connected to the Internet through a wireless LAN device.

  According to another aspect of the present invention, there is provided a digital broadcast display control method using a mobile terminal device, wherein a first reception step of receiving a 1-segment digital broadcast signal and a terrestrial digital broadcast signal can be received. A second receiving step of receiving a digital terrestrial broadcast signal corresponding to the digital broadcast signal of the 1 segment by communication from the digital terrestrial broadcast receiving device, and the digital broadcast signal of the 1 segment and the digital terrestrial broadcast signal, The display control method is characterized by performing control related to display on the display unit based on the above.

  In addition, a digital broadcast transmission / reception method using a terrestrial digital broadcast receiver, wherein a terrestrial digital broadcast signal corresponding to the 1 seg digital broadcast signal is received from a portable terminal device that receives the 1 seg digital broadcast signal. A step of converting the received terrestrial digital broadcast signal in response to a request from the portable terminal device, and a step of transmitting the converted terrestrial digital broadcast signal to the portable terminal device. A transmission / reception method is provided.

  The present invention may be a program for causing a computer to execute the above steps, or a computer-readable recording medium for recording the program.

  ADVANTAGE OF THE INVENTION According to this invention, it can be made to deliver by the optimal size for the display size or display mode (display size) of a portable terminal device. Therefore, a high-quality display can be used for beautiful viewing. At this time, it is possible to simultaneously enjoy 1-segment data broadcasting. When 1-segment reception is used only for data broadcasting, unnecessary reception can be reduced.

  In this specification, the digital broadcast receiving device includes a digital broadcast television receiving device such as a liquid crystal television, a recording / reproducing device such as a hard disk recorder, and the like. The portable terminal device includes a mobile phone, a portable music player, a portable game machine, a remote control device, and the like.

  In the digital broadcast receiving system according to the present invention, a 12-segment broadcast is received by a home digital tuner-equipped device, and the received data is distributed to a portable terminal using a wireless LAN or the like. At this time, the data to be distributed is not converted into a one-segment format, but is converted into a size suitable for the display size of the mobile terminal and distributed. At this time, the portable terminal can be displayed in combination with 1-segment data broadcasting. Although it is not necessary for the user to be aware that 12-segment broadcasting is being distributed via a wireless LAN or the like, the display is of high quality. As for data broadcasting, when a VGA liquid crystal display device is provided, it is preferably enlarged to double the size and displayed in a manner similar to that of 1 segment. Request to change the video size to be distributed according to the full screen display and the vertical display.

  In this mode, the number of data broadcast receptions may be set to be reduced. Alternatively, the master unit may also look at 1-segment data and tell the update timing. Of course, it is preferable to react to the user's data broadcast operation action.

  Hereinafter, a digital broadcast receiving system according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration example of a digital broadcast receiving system according to the present embodiment. As shown in FIG. 1, the digital broadcast receiver A according to the present embodiment is generally installed indoors in a building (for example, a home) H. The fixed UHF antenna 3 is installed on the roof of the building H or the like, is manufactured by a terrestrial digital television broadcasting station (not shown), and receives a broadcast wave L1 transmitted from the television tower 1. The signal of the terrestrial digital television broadcast wave L1 received via the fixed UHF antenna 3 is sent to the digital broadcast receiver 7 through, for example, a cable L2. The digital broadcast receiver 7 extracts the terrestrial digital TV broadcast of the channel selected by the user from the signal of the digital broadcast wave L1 received by the fixed UHF antenna 3, demodulates and decodes the video obtained as a result A signal is sent to the television 5. The user can view a digital terrestrial television broadcast program on the television 5.

  In addition to the display unit 21 and the operation unit 23, the mobile terminal such as the mobile phone 15 has a UHF antenna 17 and a portable receiver, receives a terrestrial digital television broadcast wave L4 for the portable receiver, It is possible to play back terrestrial digital television broadcast programs. In addition, the cellular phone 15 has a wireless LAN handset that receives a video / audio signal L3 wirelessly transferred from an interface (for example, a wireless LAN base unit) 11 of the digital broadcast receiver 7, and the handset Is decoded so that the video obtained as a result of the decoding can be displayed on the display unit 21. With this configuration, the user can view the terrestrial digital television broadcast program obtained from the fixed UHF antenna 3 via the digital broadcast receiver 7 on the mobile phone 15. In other words, the digital broadcast receiver 7 and the mobile phone 15 according to the present embodiment are configured to be capable of direct short-range wireless communication using Bluetooth, wireless LAN, or the like, or communication by network connection via an access point. Further, the digital broadcast receiver 7 is configured to convert the demodulated digital terrestrial television broadcast signal into a codec and a size desired by the mobile phone 15 and transfer them.

  Broadcasting for mobile receivers (1-segment broadcasting) has a general video size of QVGA (320 pixels × 240 pixels), so the resolution of the display unit 21 of the mobile phone 15 is VGA (640 pixels × 480 pixels), etc. If they are different, the full screen display will cause the video to be enlarged and the video quality will deteriorate. In addition, since the bit rate is low, even if it is desired to perform high-quality viewing using the high-resolution display unit 21 such as VGA, an image obtained by enlarging one segment data cannot provide an image with sufficient quality. Further, if the mobile phone 15 is configured to receive terrestrial digital broadcasting of 12 segments, the amount of processing is large, so that power consumption increases, and it is not suitable for a mobile phone driven by a battery.

  Therefore, as described above, by transferring the video / audio signal based on the 12-segment terrestrial digital broadcast from the digital broadcast receiver 7 capable of receiving the 12-segment terrestrial digital broadcast to the mobile phone 15, the user can High-quality digital terrestrial broadcasts can be viewed while moving indoors.

  FIG. 2 is a functional block diagram showing a configuration example of the digital broadcast receiver 7 according to this embodiment. The digital broadcast receiver 7 according to this embodiment includes a tuner 31 that selects a broadcast from the antenna 3, a demodulator 33, a TS demultiplexer (abbreviated as TS-Demux in the figure) 35, an MPEG2 decoder 37, The wireless transmission / reception unit 51, the operation unit 47, the control unit 45, the modulation / demodulation unit 43, the conversion unit 41, and the like are included.

  In the above configuration, the RF signal received by the fixed UHF antenna 3 is input to the tuner 31. In the tuner 31, for example, tuning is performed according to an input from the operation unit 47. In other words, 13 segment broadcast signals (both for the fixed receiver and for the mobile receiver) constituting the channel desired by the user (5.6 MHz band) are extracted.

  The demodulator 33 performs OFDM demodulation on the signal selected by the tuner 31. Specifically, an analog signal is converted into a digital signal, and FFT processing (Fast Fourier Transform) is performed on the analog signal. Then, demodulation processing (64QAM (Quadrature Amplitude Modulation) demodulation, etc.) is performed, and error correction is performed to generate a TS (Transport Stream) packet signal sent out by the broadcasting station. Further, the demodulator 33 can demodulate both the broadcast signal for the fixed receiver modulated by the 64QAM system and the broadcast signal for the mobile receiver modulated by the QPSK (Quadrature Phase Shift Keying) system.

  A TS demultiplexer (Demultiplexer: separation circuit) separates TS packets by purpose and performs predetermined processing. Specifically, first, the TS packet is separated into purpose-specific packet signals such as a video stream, an audio stream, a data broadcast stream, and SI (Service Information: program arrangement information) information. The video stream and audio stream packets are sent to the MPEG2 decoder. The packet of the data broadcast stream is sent to the control unit 45. The SI information is processed by the control unit 45 and used for EPG (Electronic Program Guide), channel selection processing, and the like. Further, when there is a request from the outside (for example, a mobile phone), it is also possible to output the video stream and audio stream packets to the modulation / demodulation unit 43 that generates a signal for transmitting to the outside.

  The MPEG2 decoder 37 receives the data stream supplied from the TS demultiplexer 35 and converts it into a video signal and an audio signal. The video signal and audio signal obtained by the conversion are transmitted to a television receiver (hereinafter referred to as “TV”) 5. The user can view the terrestrial digital television broadcast on the television 5.

  The wireless transmission / reception unit 51 communicates with the outside using wireless signals. The modem unit 43 performs modulation processing for generating a signal transmitted from the wireless transmission / reception unit 51, demodulation processing of a signal received by the wireless transmission / reception unit 51, and the like. For example, a TS packet signal for a mobile receiver obtained by the separation process in the TS demultiplexer 35 is modulated into a signal suitable for wireless transmission by the modem 43 and transmitted from the wireless transceiver 51 to a mobile phone or the like. Be able to.

  The radio signal transmitted from the cellular phone is demodulated by the modem 43 into a signal that can be decoded by the controller 45. In the wireless communication between the digital broadcast receiver 7 and the mobile phone, for example, the Bluetooth method can be used. The operation unit 47 is an operation button of the digital broadcast receiver 7 or a remote control device attached to the digital broadcast receiver 7, and can accept the input from the user and cause the digital broadcast receiver 7 to function.

  Next, the configuration of a TS packet obtained (reproduced) by demodulation processing in the demodulation unit 33 will be described. The TS packet is a packet having a fixed length of 188 bytes. A TS packet includes a packet header, an adaptation field, and a payload (data portion). Video signals, audio signals, and the like are transmitted in a payload. The adaptation field stores time information that is a reference for one program called PCR (Program Clock Reference).

  The payload of the TS contains a program included in the stream and information indicating the configuration of the program. These are called Program Specific Information (PSI), PAT (Program Association Table), PMT (Program Map Table), NIT (Network Information Table), CAT (Cad 4). ing.

  In addition to the video signal and audio signal packets, the TS packet signal may include data broadcasting, EPG (Electronic Program Guide), information necessary for channel selection (SI information, PSI information), and the like. good.

  In the MPEG-2 system TS, each multi-program ES (Elementary Stream, elementary stream, data obtained by compressing and encoding audio and video data with MPEG-2), respectively, is a PID (Packet IDentifier, packet identifier). The 13-bit identifier of the TS packet header is assigned. Each MPEG can be assigned to any PID as long as this PID is between 0x0010 and 0x1FFE (equivalent to 16 to 8190 in hexadecimal notation) in MPEG-2.

  However, according to the broadcasting standard for each country, the allocation method of PID to broadcasting stations and the allocation according to the type of ES are determined. For example, different PIDs are allocated to TS packets of video data, audio data, PMT, and PAT, respectively. The TS demultiplexer of the digital broadcast receiver or the TS demultiplexer of the mobile phone described later selects and classifies the TS packets based on the PID of the TS packet, and performs predetermined processing on each. For example, if the TS packet is a video data or music data packet, the TS packet is transmitted to the MPEG decoder.

  In response to a request from the mobile phone, video data and audio data decoded by the MPEG2 decoder are sent to the conversion unit 41. H.264, the audio data is format converted to MPEG-AAC. As for the video data, if the original video has a ratio of 16: 9, the size is converted to horizontal 480 px and vertical 270 px, and if it has a ratio of 4: 3, it is converted to horizontal 480 px and vertical 360 px (see below, mobile phone). When the telephone is in the vertical viewing mode where data broadcasting is displayed together), it is output to the modem unit 43 together with the audio data. The data output to the modem unit 43 is transmitted from the wireless transmission / reception unit 51 to the mobile phone. As described above, the user of the mobile phone can view the terrestrial digital broadcast program received by the digital broadcast receiving device 7 on the mobile phone with a picture quality as high as the resolution of the display of the mobile phone. It becomes.

  In the above description, the video data is H.264. H.264 describes an example in which audio data is converted to MPEG-AAC, but other formats may be used as long as the cellular phone can handle them. Therefore, when requesting data from a mobile phone, not only the size of the requested program or video, but also compatible format information is sent to the digital broadcast receiver, and the digital broadcast receiver is sent from the mobile phone. What is necessary is just to be comprised so that it may convert in the format contained in the information of a request. In addition, when there are a plurality of formats that can be supported by the mobile phone, the compatible format list is transmitted to the digital broadcast receiver, and the digital broadcast receiver selects a format that can be supported in the list from among a plurality of candidates. You may have a mechanism to choose from.

  The codec of the video received by the mobile phone from the digital broadcast receiver is the above-mentioned H.264. It is not limited to H.264 + MPEG-AAC. For example, data demodulated from the modem unit is decoded by a predetermined codec, audio is sent to a speaker, and video is sent to a data synthesis unit (or a direct display unit if it is not necessary to synthesize a data broadcast). good. In other words, in the 1-segment broadcasting, video is H.264. H.264, if the audio is MPEG-AAC and the data transmitted on the radio wave from the digital broadcast receiver is encoded by the above codec, the video is directly H.264. The audio may be sent to the MPEG-AAC decoder to the H.264 decoder (refer to the arrow pointing from the “modulator / demodulator” to each decoder in FIG. 3). If this mobile phone is equipped with an MPEG2 decoder (not shown), when MPEG2-encoded data is sent, an arrow extends from the modem unit to the MPEG2 decoder, from which the data composition unit and You may make it an arrow advance to a display part.

  Therefore, a list of formats that can be decoded by the mobile phone may be notified to the digital broadcast receiver when a program is requested.

  FIG. 3 is a diagram illustrating a configuration example of the mobile phone according to the present embodiment. The mobile phone 15 includes a tuner 61, a demodulator 63, a TS demultiplexer 65, an H.264 mobile phone. The H.264 decoder 71, the display unit 21, the wireless transmission / reception unit 81, the operation unit 23, the control unit 83, the antenna 17, the MPEG-AAC decoder 67, the speaker 75, the modulation / demodulation unit 77, and the like are configured.

  The antenna 17 receives a terrestrial digital television broadcast wave transmitted from a terrestrial digital television broadcast station. The RF signal received by the antenna 17 is input to the tuner 61. The tuner 61 performs channel selection according to the input from the operation unit 23. The tuner 61 extracts a one-segment broadcast signal arranged in the center from among the 13-segment broadcast signals constituting the channel desired by the user (5.6 MHz band).

  The demodulator 63 performs OFDM demodulation on the signal selected by the tuner 61. More specifically, an analog signal is converted into a digital signal, FFT (Fast Fourier Transform: Fast Fourier Transform) is performed on the analog signal, 64QAM (by, etc.) demodulation is performed, and error correction is performed. A TS (Transport Stream) packet signal sent out by the station is generated.

  The TS demultiplexer 65 separates TS packets by purpose and performs predetermined processing. For example, for packet signals related to video, H.264 is used. To the H.264 decoder 71. The packet signal related to audio is sent to the MPEG-AAC decoder 67. The data broadcast signal is transmitted to the control unit 83, analyzed for display, and then transmitted to the display unit 21.

  H. The H.264 decoder 71 receives the data stream supplied from the TS demultiplexer 65 and converts it into a video signal. The video signal obtained by the conversion is transmitted to the display unit 21. The user can view digital terrestrial television broadcasting through the display unit 21.

  The MPEG-AAC decoder 67 receives the data stream supplied from the TS demultiplexer 65 and converts it into an audio signal. The audio signal obtained by the conversion is transmitted to the speaker 75.

  The wireless transmission / reception unit 81 communicates with the outside by a wireless signal. The modulation / demodulation unit 77 performs modulation for generating a signal transmitted from the wireless transmission / reception unit 81, demodulation of a signal received by the wireless transmission / reception unit 81, and the like. For example, the wireless transmission / reception unit 81 receives a wireless signal including video and audio transmitted from a digital broadcast receiver, and is demodulated into a signal that can be decoded by the control unit 83 by the modem unit 77. If the demodulated video / audio signal is a video signal, it is H.264. H.264 decoder 71 is decoded and transmitted to display unit 21, and if it is an audio signal, it is transferred to MEG-AAC decoder 67, decoded and transmitted to speaker 75. The display unit 21 displays the video signal obtained from the wireless transmission / reception unit 81 and the data broadcast signal simultaneously. Information input from the operation unit 23 by the user of the mobile phone 15 is modulated into a radio signal by the modem 77 and transmitted from the radio transceiver 81 to the digital broadcast receiver. The operation unit 23 is an operation button or the like of the mobile phone, and receives input from the user.

  FIG. 4 is a flowchart showing a flow of processing from when a mobile phone receives one segment, searching for a terrestrial digital broadcast tuner, making a video request, and displaying it.

  In step S1, when the TV viewing mode is started (TV reception is started on the mobile phone: first processing), in step S2, the wireless transmission / reception unit confirms the network connection, and if the network connection is possible (Yes), the digital at home Connect to a broadcast receiver (a state where data can be sent and received, and a connection is established). If a digital broadcast receiver is not found on the network, or if it is found but the tuner of the digital broadcast receiver is currently being used separately and cannot be used for a mobile phone (No in step S2), Similarly, viewing is performed in one segment (step S4). Here, in the case of a connection method in which a digital broadcast receiver and a mobile phone are directly connected (ad hoc connection in wireless LAN), the determination to connect to a network is “There is a connectable digital broadcast receiver”. .

  The portable receiving terminal checks whether the tuner of the receiver that has established the connection is available (step S3). If it is not available (No), “view with 1 segment” is performed (step S5). In the case of the ad hoc connection, the determination as to whether or not a digital broadcast receiver with an empty tuner is on the network is “the tuner of the connected digital broadcast receiver is empty”. Here, even if the tuner is not available, if the digital broadcast receiver receives a program desired by the user of the mobile phone, the tuner can be used. However, in that case, since it cannot be determined that the desired program program of the mobile phone user has not been transmitted to the tuner, in that case, it may be confirmed using the desired program information when checking whether the tuner is available. .

  Next, in the case of Yes in step S3, it is confirmed whether the viewing style on the mobile phone is horizontal viewing (full-screen viewing) or vertical viewing (video plus data) viewing (if full-screen viewing). The screen is viewed in the horizontal direction. The determination is Yes and the process proceeds to step S7. If No, the screen is viewed in the vertical direction and the process proceeds to step S11).

  In steps S7 and S11, the video size to be received, the format, the audio format, and information that can be specified as the content currently being viewed are transmitted, and a video transfer is requested. In the case of full screen viewing (horizontal viewing) in step S7, the desired program information and video format are H.264. H.264, MPEG-AAC as the audio format, 640 pixels in the horizontal direction and 480 pixels in the vertical direction as the requested video size, and a video transfer request is made.

  In the case of vertical viewing (data broadcasting plus video) in step S11, the desired program information and video format are H.264. H.264, MPEG-AAC as the audio format, 360 horizontal pixels and 270 vertical pixels as the requested video size, and a video transfer request.

  The above is specified assuming that the video source is 4: 3 in both the vertical and horizontal directions. However, if the aspect ratio (aspect ratio) of the video source is known by the mobile phone, it should be received. You may specify the size of the video (If you know that it is 16: 9 broadcast, 640 pixels wide and 360 pixels long for full screen viewing, 480 pixels wide and 270 pixels long for vertical viewing) . Also, depending on the mobile phone, the antenna icon, battery icon, etc. may be displayed at the top and bottom of the screen, and the size of the display portion of the video souce varies depending on the application, so it is not limited to the above size, The size of the area where the video is finally displayed may be specified depending on the direction of the screen to be viewed and the viewing method.

  Next, proceeding to step S8 and step S12, the video / audio data is transferred from the digital broadcast receiver and received by the wireless receiver of the mobile phone. In steps S9 and S13, the data is demodulated into data that can be recognized by the modem, the audio data is sent to the MPEG-AAC decoder, and the video data is sent to H.264. H.264 decoder. Broadcast data obtained by receiving one segment is analyzed by the control unit and sent to the display unit (as shown in step S14, the one-segment data may be received only in the case of vertical viewing. ). Next, in step S10, the decoded sound is transmitted to the speaker, and the video and the data broadcast are combined and displayed on the display unit.

  As described above, in the case of including video and data broadcasting (when viewing with the display unit in the vertical direction), the video data of horizontal 480 × vertical 360 or video data of horizontal 480 × vertical 270 is received, Data broadcasting can also be expanded to 480 horizontal. High-quality video data from a digital broadcast receiver can be maintained even when stretched, so it is displayed on the display screen of a mobile phone. On the other hand, text data for teletext etc. is displayed on the display screen and display video of the mobile phone. By using a font that matches the content of the file, it is possible to display a beautiful data broadcast even if it is enlarged.

  More specifically, a 1-segment data broadcast is described in a data broadcast description language BML document on the assumption that the side is displayed at 240 px. The font size is also specified in the BML document. For example, when a font size of 12 px is specified, when the QVGA display is in the vertical direction, 20 characters are displayed in one line. When this is displayed on a VGA display, the horizontal direction is 480 px, and if a 12 px font is used as it is, 40 characters can be displayed in one line. However, since the entire data broadcast is enlarged two times vertically and horizontally, if the font specified in BML is used as it is (as it is 12 px), the design is contrary to the intention of the BML creator.

  Similarly to image data, when a 12 px font is expanded in the display memory and then the entire image is expanded twice in the vertical and horizontal directions, the font is finally displayed as dots on the display. Then, there is a problem that a disturbance such as a zigzag in a diagonal line of a character is stretched as it is. Therefore, when a 24 px font is used when 12 px is specified, characters can be displayed clearly, unlike when the 12 px font is doubled.

  The received video size depends on the size of the original broadcast video. In this way, the image data can be enlarged and the text can be used in a font that matches it.

  In addition, here, as a method of determining whether or not the program is the same as 1 segment, it is obliged that the program for the fixed reception and the portable reception is the same in the simultaneous broadcasting until at least 2008. Therefore, in an environment where simulcasting is performed, if only the channel number (information that TBS is 6 or information that Fuji TV is 8) is notified, the program of that channel for the same time may be transferred.

  On the other hand, if it is not simulcast, or if the mobile phone is in Osaka and the receiver is in Tokyo, the channel number alone cannot be specified. As a method for specifying this, there are a method in which EIT and NIT included in a broadcast TS are compared, or program title information is transmitted as text and a program having a title at the same time is searched by a receiver. That is, it becomes possible by transmitting program information that can specify a program from a mobile phone.

  Next, the flow of processing until the digital broadcast receiver requested from the mobile phone transfers the video data will be described with reference to the flowchart shown in FIG. First, in step S21, the digital broadcast receiver performs network connection with the mobile phone. Next, in step S22, a reply is made to the “inquiry as to whether there is a tuner available” in FIG. This step may be processed in the determination process so that “Yes” is answered if the tuner device is available and “No” is answered if there is no available device. If there is a video request in step S23, the process proceeds to step S24, and the video transfer request in step S7 of FIG. 4 is received. Next, in step S25, the conversion unit converts the received program into a designated size and format, and in step S26, the modulation / demodulation unit performs a process of modulating the received program in a form that can be transmitted wirelessly. In S27, a process of transmitting from the wireless transmission / reception unit is performed. Through the above processing, the digital broadcast receiver can transfer the video data to the requesting mobile phone.

FIG. 6 is a flowchart of the operation when the viewing style of the mobile phone is switched between the vertical direction and the horizontal direction.
First, in step S13, when viewing conversion (vertical / horizontal viewing conversion) is performed, the process jumps to the determination processing of whether or not “full screen viewing” in step S6 in FIG. Is done.

  As described above, when a mobile phone receives a 1-segment broadcast, it searches for a device equipped with a digital terrestrial tuner and requests video transfer, even when a high-resolution display is installed. The display quality in the 1-segment receiver can be improved. In addition, data broadcasting can be enjoyed.

  Next, a digital broadcast receiving system according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a diagram showing an example of a system configuration showing a situation in which viewing is performed in a state where the mobile phone is outside the home, in the system according to the present embodiment. The basic configuration is the same as the configuration shown in FIG. 1, but the home digital broadcast receiver 7 is connected to the Internet network NT via the modem 10 instead of being connected to the mobile phone via the home network. Has been. The mobile phone 15 is connected via the Internet network NT. The mobile phone 15 is connected to an external wireless LAN antenna 85 instead of being directly connected to the home digital broadcast receiver 7 wirelessly, and is connected to the home digital broadcast receiver 7 via the Internet network NT. It is stretched. According to this configuration, even when the mobile phone 15 and the digital broadcast receiver 7 are separated from each other, the display quality in the 1-segment receiver can be improved as in the first embodiment, and the data broadcast can be performed. Since it can be enjoyed, there is an advantage that the range of use can be expanded.

  That is, when the mobile phone 15 can be connected to the home digital broadcast receiver 7 via a wireless LAN or the like, for example, rather than receiving a QVGA 1-segment broadcast, the VGA data sent from the home digital broadcast receiver 7 By displaying the high image quality as a source, a beautiful image can be seen. At this time, by combining and displaying 1-segment data and video sent from home even outdoors, the user feels that he / she is watching a broadcast based on only 1-segment, and does not make the user aware of it. In fact, there is an advantage that it is possible to provide high-quality video sent from home in the apparatus.

  Next, a digital broadcast receiving system according to the third embodiment of the present invention will be described with reference to FIG. In the first and second embodiments, an example has been shown in which it is assumed that the 1-segment data broadcast is received by the mobile phone 15 from the TV tower 1 to the last. In the present embodiment, the 1-segment data broadcast L4 is also received from the digital broadcast receiver 7 which is a fixed receiver. That is, as shown in FIG. 8, 1-segment data broadcast information may also be obtained from the digital broadcast receiver 7. In this case, after receiving the 13-segment digital broadcast wave, the digital broadcast receiver 7 extracts the data broadcast information from the data of the 1-segment portion, and displays the data broadcast information together with the video requested from the mobile phone 15 to the mobile phone. 15 to send. In this way, even when it is difficult to receive 1-segment broadcasting of the mobile phone 15 in the house H or the like, it is possible to enjoy data broadcasting while making full use of the resolution of the display.

  It is to be noted that a control unit for determining which one of the signals from the TV tower 1 and the one from the digital broadcast receiver 7 is larger in the 1-seg broadcast reception intensity and controlling to acquire 1-seg data from the one with the greater intensity is carried. It may be provided on the telephone 15.

  In the following, a configuration example of video and data will be described with reference to the drawings. FIG. 9 shows a state in which a display area 91a based on a video source and a display area 91b for data broadcasting and subtitles are displayed on the display unit 21 when the mobile phone according to the present embodiment is viewed vertically. It is a figure which shows the example of. A case where the display screen 21 of the mobile phone is VGA will be described as an example. In the example shown in FIG. 9A, the display unit 21 has a horizontal size of 480 px and a vertical length of 640 px, and the display area 91a based on the video source is displayed with a vertical size of 270 px and a horizontal size of 360 px.

  On the other hand, in FIG. 9B, in the display unit 21 of the same VGA (horizontal 480 px, vertical 640 px), the display 93a based on the video source is a 480 px, 270 px 16: 9 display, and data broadcasting, A subtitle display 93b is displayed at 480 px and 370 px.

  FIG. 10 is a diagram illustrating a display example when viewing horizontally. In this case, the screen of the mobile phone is VGA, and an example in which only video is displayed is shown. In the diagram shown in FIG. 10A, the display screen 21 of the mobile phone is a VGA, and the state of video display based on the video source (4: 3) in the case of landscape viewing with the display unit oriented in the landscape orientation is shown. Yes. Full-screen display of 640 px wide and 480 px vertical can be enjoyed with high image quality. On the other hand, as shown in FIG. 10B, the screen of the mobile phone is a VGA, and the display based on the video source (16: 9) is displayed in the area of 360 px × 640 px on the display screen of 640 px horizontal and 480 px vertical. 97b may be used. In this case, the blank areas 97a and 97c are arranged above and below the display 97b, but the arrangement of the display area and the blank area is arbitrary. In the case of FIG. 10B, since there is no data to be displayed, a blank area is provided. Of course, a decorative pattern or the like may be displayed in the blank area.

  Note that the actual video size and arrangement described above differ depending on the application, and the display examples shown in FIGS. 9 and 10 are just one example. This is based on the premise that the display screen of the portable receiver is VGA. Therefore, when the display is different from VGA such as WVGA, display control is performed so that the screen configuration is suitable for the application. The size of the video corresponding to the screen configuration may be specified when a transmission request for video from the mobile phone is requested. More specifically, when a video + data broadcast source is received (viewing in the vertical direction of the display), a horizontal 480 × vertical 360 video or a horizontal 480 × vertical 270 video is received, and the data broadcast is also horizontal 480. Stretch to. In other words, even if the display screen is large and the display area itself can be enlarged by enlarging the image data and using a font that matches the text data, it is possible to obtain a high-quality video and a beautiful data broadcast display. . The received video size reflects the aspect ratio of the size of the original broadcast video, that is, for example, whether the video source is 320 × 240 (4: 3) or 320 × 180 (16: 9). Depending on whether or not, the received video size is controlled to be changed.

  As a method for controlling the video size received based on the video source, for example, the following method can be used. When the display screen of the mobile phone is VGA and the size of the viewing video obtained by 1-segment broadcasting is 320 × 240 (4: 3), the area size for displaying the video is the vertical viewing (video + Data broadcasting) is 360 × 270, and in horizontal direction (full screen) viewing (video only), it is 640 × 480. Therefore, when video transmission is requested (S7 or S11 in FIG. 4) Make requests using size information. Similarly, when the size of the viewing video obtained by 1-segment broadcasting is 320 × 180 (16: 9), size information of 480 × 270 for vertical viewing and 640 × 360 for horizontal viewing is used. Use to make a request.

  In FIG. 9A, an example is described in which the size of the video portion is 360 × 270. However, depending on the application to be displayed, the video portion may be displayed at 480 × 360 (4: 3) according to the horizontal width. Also good.

  Since reception of 1-segment broadcasting operates only for receiving data broadcasting, it is possible to perform reception intermittently rather than always (since data broadcasting is static) It is not necessary to update constantly.) Power consumption of the device can be suppressed. In addition, when displaying a full screen (video), it is not necessary to receive a horizontal 640 × vertical 480 video or a horizontal 640 × vertical 360 video and receive one segment. That is, since there is no area for displaying data broadcasting, reception of 1-segment broadcasting may be stopped. In this way, power consumption in a mobile phone driven by a battery can be suppressed.

  As described above, according to the present embodiment, it is possible to distribute the mobile terminal device in a size optimal for the display size or display mode (display size). Therefore, a high-quality display can be used for beautiful viewing. At this time, it is possible to simultaneously enjoy 1-segment data broadcasting. When 1-segment reception is used only for data broadcasting, unnecessary reception can be reduced.

  For example, a 1-segment receiver equipped with a high-resolution display such as VGA can be viewed with a higher resolution and a higher bit rate than a 1-segment broadcast video size QVGA. You can also enjoy data broadcasting at the same time. Since dot-by-dot signals can always be displayed by switching between full-screen display and data broadcasting + video, scaling is not required, thus reducing costs.

  The present invention can be used as a digital broadcast receiving system.

It is a figure which shows the example of 1 structure of the digital broadcast receiving system by the 1st Embodiment of this invention. It is the functional block diagram which showed the example of 1 structure of the digital broadcast receiver by this Embodiment. It is a figure which shows the example of 1 structure of the mobile telephone by this Embodiment. FIG. 10 is a flowchart showing a flow of processing from when a mobile phone receives one segment, to search for a terrestrial digital broadcast tuner, to request a video and to display it. It is a flowchart figure which shows the flow of a process until the digital broadcast receiver requested | required from the mobile telephone transfers video data. It is a flowchart figure of operation | movement when the viewing-and-listening style of a mobile telephone is switched with the vertical direction and the horizontal direction. It is a figure which shows the example of 1 structure of the digital broadcast receiving system by the 2nd Embodiment of this invention. It is a figure which shows the example of 1 structure of the digital broadcast receiving system by the 3rd Embodiment of this invention. It is a figure which shows the example of a mode that the display area based on a video source in the case of the vertical viewing at the time of the video viewing of the mobile phone by this Embodiment and the display area of a data broadcast or a subtitle are displayed on the display part. . It is a figure which shows the example of a display in the case of viewing sideways.

Explanation of symbols

A ... Digital broadcast receiver, H ... Building, 1 ... TV tower, 3 ... UHF antenna, 5 ... Television receiver, 7 ... Digital broadcast receiver, 15 ... Mobile phone, 17 ... UHF antenna, 21 ... Display unit, 23 DESCRIPTION OF SYMBOLS Operation part 31 ... Tuner 33 ... Demodulation part 35 ... TS-DEMUX 37 ... MPEG2 decoder 41 ... Conversion part 43 ... Modulation / demodulation part 45 ... Control part 47 ... Operation part 51 ... Wireless transmission / reception part, 61 ... Tuner 63 ... Demodulator 65 ... TS-DEMUX 67 ... MPEG-ACC decoder 71 ... H. H.264 decoder, 73... Decoder, 75 .. speaker, 77 .. modem unit, 81 .. wireless transmission / reception unit, 83.

Claims (18)

A display unit for performing display based on digital broadcasting;
A first receiver for receiving a first digital broadcast signal for a mobile receiver;
A second receiver that receives the second digital broadcast signal by communication from a digital broadcast receiver capable of receiving a higher-quality broadcast signal corresponding to the first digital broadcast signal;
A portable terminal device comprising: a display control unit that performs display control on the display unit based on the first digital broadcast signal and the second digital broadcast signal.   The mobile terminal device according to claim 1, wherein a request regarding display characteristics of the second digital broadcast signal is made to the digital broadcast receiving device via the second receiving unit.   The mobile terminal device according to claim 2, wherein a transmission request for a digital broadcast signal capable of displaying a high-quality video suitable for display performance of the display unit is made as the request. A display unit for performing display based on digital broadcasting;
A first receiver for receiving a 1-segment digital broadcast signal;
A second receiver for receiving a terrestrial digital broadcast signal corresponding to the digital broadcast signal of the 1 segment by communication from a terrestrial digital broadcast receiver capable of receiving a terrestrial digital broadcast signal;
A portable terminal device comprising: a display control unit that performs display control on the display unit based on the one-segment digital broadcast signal and the terrestrial digital broadcast signal.   5. The portable terminal device according to claim 4, wherein video is displayed based on the terrestrial digital broadcast signal, and data broadcast is displayed based on the one-segment digital broadcast signal.   The portable terminal device according to claim 4, wherein when the display unit displays a full screen, control to stop reception by the first reception unit is performed.   The mobile terminal device according to any one of claims 4 to 6, further comprising a correspondence confirmation unit that confirms whether the one-segment digital broadcast and the terrestrial digital broadcast are the same program. . A terrestrial digital broadcast receiver for receiving terrestrial digital broadcast signals;
A communication unit that performs communication with a mobile terminal device that includes a first receiving unit that receives a 1-segment digital broadcast signal;
The mobile terminal device receives the terrestrial digital broadcast signal corresponding to the one-segment digital broadcast signal by the terrestrial digital broadcast reception unit and converts the video converted into a format that can be displayed on the mobile terminal device via the communication unit. A terrestrial digital broadcast receiving apparatus, characterized by   And a video conversion unit configured to convert a video based on the terrestrial digital broadcast signal received by the terrestrial digital broadcast reception unit based on display characteristics requested from the portable terminal device via the communication unit. Item 9. The terrestrial digital broadcast receiver according to Item 8. The 1-segment digital broadcast signal is communicated from a display section that performs display based on digital broadcast, a first receiver section that receives a 1-segment digital broadcast signal, and a terrestrial digital broadcast receiver that can receive the terrestrial digital broadcast signal. A second receiving unit that receives the corresponding terrestrial digital broadcast signal, and a display control unit that controls display on the display unit based on the one-segment digital broadcast signal and the terrestrial digital broadcast signal, A portable terminal device having;
A terrestrial digital broadcast receiving unit that receives the terrestrial digital broadcast signal, and a communication unit that performs communication with the mobile terminal device, and the terrestrial digital broadcast signal corresponding to the one-segment digital broadcast signal is transmitted to the terrestrial digital broadcast signal. A terrestrial digital broadcast receiver, wherein the terrestrial digital broadcast receiver is received by the digital broadcast receiver and transmitted to the portable terminal device via the communication unit;
Including digital broadcast receiving system. The portable terminal device has a first communication interface unit connectable to the Internet,
11. The digital broadcast receiving system according to claim 10, wherein the communication unit of the terrestrial digital broadcast receiving apparatus can communicate with the portable terminal device via the Internet.   12. The digital broadcast receiving system according to claim 11, wherein the first communication interface unit is wirelessly connected to the Internet through a wireless LAN device.   11. The digital broadcast receiving system according to claim 10, wherein the one-segment digital broadcast signal is received by the terrestrial digital broadcast receiving device and is sent to the portable terminal device via the communication unit.   The digital broadcast signal of the 1 segment is received by the terrestrial digital broadcast receiver, and the data broadcast signal therein is transmitted to the portable terminal device via the communication unit. Digital broadcast receiving system. A display control method for digital broadcasting using a portable terminal device,
A first receiving step of receiving a one-segment digital broadcast signal;
Receiving a terrestrial digital broadcast signal corresponding to the 1-segment digital broadcast signal by communication from a terrestrial digital broadcast receiver capable of receiving a terrestrial digital broadcast signal;
A display control method comprising: controlling display on a display unit based on the one-segment digital broadcast signal and the terrestrial digital broadcast signal. A digital broadcast transmission / reception method using a terrestrial digital broadcast receiver,
A receiving step of receiving a terrestrial digital broadcast signal corresponding to the one-segment digital broadcast signal from a portable terminal device that receives the one-segment digital broadcast signal;
Converting the received terrestrial digital broadcast signal in response to a request from the mobile terminal device;
Transmitting the converted terrestrial digital broadcast signal to the portable terminal device.   A program for causing a computer to execute the steps according to claim 15 or 16.   A computer-readable recording medium for recording the program according to claim 17.

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