JP2011119839A - Digital broadcast receiving system, and portable terminal device constituting the system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast receiving system capable of displaying images created and stored beforehand until broadcast data of a channel of switching destination can be displayed when channel switching is conducted by a digital broadcast receiver, and allowing a user not to be affected by unnatural impression when the previous display is switched to display of the broadcast data. <P>SOLUTION: The digital broadcast receiving system 1 includes a digital television receiver 2 and a portable telephone 3. The portable telephone 3 receives and displays digital broadcasting. The portable telephone 3 creates output data containing images and channel information of broadcast data under reception by a selected channel, and transmits the output data to digital television receiver 2. The digital television receiver 2 has a memory for storing the output data received from the portable telephone 3. At the time of channel switching, if the output data about the channel is stored, display is performed based on the output data during a period from channel switching until display can be performed based on broadcast data of a predetermined channel. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiving system and a portable terminal device used in the system. More specifically, the present invention relates to an image of a switching destination channel (still image or transcoding) created and stored in advance at the time of digital broadcasting channel switching. In particular, the present invention relates to a digital broadcast receiving system that displays a moving image) and a mobile terminal device that constitutes the system.

  Conventionally, digital broadcast receivers (TVs, recorders, set-top boxes, etc.) have a problem that, when a channel is switched, it is not possible to immediately display the broadcast of the channel to be switched to. This is because the digital broadcast receiving apparatus takes time for a series of processing until display such as acquisition of data from the station of the switching destination channel, decoding of data, and the like. Another reason is that MPEG (Moving Picture Experts Group) 2 which is a moving picture compression method used for digital broadcasting cannot be decoded only from difference information (P frame and B frame data). It may be necessary to wait until an intra frame (I frame) that does not require information is input. In the current standard TV, it is said that it takes 2 to 5 seconds to display an image after switching channels.

As a technique for solving the above-mentioned problem, for example, when the user does not select reception of digital broadcasting (for example, main power OFF state), I-frame data is received / decoded in advance for each channel, and the image Is stored in the memory, and when the channel is switched after the main power is turned on, immediately after the switching, there is a technique for displaying the image of the channel of the switching destination stored in the memory (see, for example, Patent Document 1). .
However, in this technique, for example, when a channel is switched after a long time has elapsed since the main power is turned on, an image of a program different from the program currently broadcast on the switching destination channel may be displayed immediately after switching. .

  In Patent Document 2, when a user receives a program of a channel selected by changing a channel, the I frame constituting the program is stored in a storage unit for each channel, and then the program of the channel is stored. A technique for reading and displaying the I frame stored for each channel in the storage unit until receiving the I frame of the program when receiving and displaying the program is disclosed. In the technique disclosed in Patent Document 2, the stored I frame is erased from the storage unit at regular intervals. Then, when an I frame of a program different from the currently broadcast program is stored for the channel to be switched to, or when no I frame is stored, program information including text information based on the electronic program guide is displayed. . This prevents an image of a program that is different from the program currently being broadcast on the switching destination channel from being displayed.

JP 2004-128942 A JP 2007-221509 A

  However, in the technique disclosed in Patent Document 2, an image displayed immediately after channel switching is program information including text information, so that the image is switched from that image to a moving image in which data of a currently broadcast program is decoded and displayed. And unnatural.

  In view of the above circumstances, the present invention displays an image that has been created and stored in advance during channel switching until the display based on the broadcast data of the channel to which the channel is switched becomes possible. An object of the present invention is to provide a digital broadcast receiving system that does not give an unnatural impression when the display is switched from the display of the image to the display based on the broadcast data, and a portable terminal device constituting the system.

  In order to solve the above problems, a first technical means of the present invention includes a digital broadcast receiving device, a portable terminal device having a function of communicating with the digital broadcast receiving device and a function of receiving and displaying a digital broadcast. A digital broadcast receiving system comprising: the portable terminal device generating output data including image information of broadcast data being received on a selected channel and channel information indicating which channel the data is; It has a data creation and transmission unit that transmits output data to the digital broadcast receiving device, and the digital broadcast receiving device has a data storage unit that stores the output data received from the portable terminal device. From the channel switching until the display based on the broadcast data of the predetermined channel becomes possible, the channel If the output data of the stomach is stored in the data storage unit, it is obtained by and performing display based on the output data.

  According to a second technical means of the present invention, in the first technical means, the data creation / transmission unit of the mobile terminal device creates and transmits the output data every time an intra frame of the broadcast data is received. It is a thing.

  According to a third technical means of the present invention, in the first technical means, the portable terminal device further has a function of transmitting a remote control signal to the digital broadcast receiving device, and is being displayed on the portable terminal device. When transmitting a remote control signal instructing the channel to switch the channel of the digital broadcast receiving device, the data creation and transmission unit creates and transmits the output data based on the broadcast data of the channel being displayed. It is a feature.

  According to a fourth technical means of the present invention, in the first technical means, the mobile terminal device further has a function of automatically switching a channel received by the mobile terminal device, and the data creation and transmission unit includes a channel The output data is generated and transmitted based on the broadcast data of the channel after the switching at each switching.

  A fifth technical means of the present invention is characterized in that, in the fourth technical means, the mobile terminal device displays and outputs broadcast data images of a plurality of channels automatically switched and received on one screen. Is.

  According to a sixth technical means of the present invention, in the first technical means, the mobile terminal device further includes a storage unit that stores an electronic program guide, and the data creation and transmission unit is based on the electronic program guide. The output data is generated and transmitted at least each time the program in the channel being displayed on the portable terminal device is switched.

  According to a seventh technical means of the present invention, in any one of the first to sixth technical means, the image information is still image data.

  According to an eighth technical means of the present invention, in any one of the first to sixth technical means, the image information is transcoded moving image data.

  According to a ninth technical means of the present invention, in the eighth technical means, the output data includes audio data.

  According to a tenth technical means of the present invention, in the technical means according to any one of the first to ninth aspects, when the digital broadcast receiving device performs display based on the output data, the portable data terminal device outputs the output data. It is characterized in that a message indicating that it has been created is also displayed.

  The eleventh technical means of the present invention is a portable terminal device constituting the digital broadcast receiving system of any one of the first to ninth technical means.

  According to the present invention, since the digital broadcast receiving apparatus can display the broadcast image of the switching destination channel received by the mobile terminal device immediately after the channel switching, the broadcast of the switching destination channel can be displayed from the display of the image. It is possible to prevent an unnatural impression from being given to the user when switching to the display of a moving image obtained by decoding data.

1 is a system configuration diagram illustrating a digital broadcast receiving system according to a first embodiment of the present invention. It is a figure explaining the utilization form of the digital broadcast receiving system of 1st Example of this invention. It is a block diagram which shows the structural example of the mobile telephone of FIG. It is a figure which shows the structural example of the data for blank periods. It is a block diagram which shows the structural example of the digital television of FIG. It is a block diagram explaining operation | movement of the display control part of the digital television of FIG. It is a figure which shows the example of the display screen of the digital television of FIG. It is a flowchart explaining an example of a process of the mobile phone of FIG. It is a flowchart explaining an example of the process of the mobile telephone of 2nd Example of this invention. It is a figure explaining the utilization form of the digital broadcast receiving system of the 3rd Example of this invention. It is a block diagram which shows the structural example of the mobile telephone of FIG. It is a block diagram which shows the structural example of the digital television of FIG. 12 is a flowchart illustrating an example of processing of the mobile phone in FIG. It is a block diagram which shows the structural example of the mobile telephone of the 4th Example of this invention.

(First embodiment)
FIG. 1 is a system configuration diagram illustrating a digital broadcast receiving system according to a first embodiment of the present invention.
As shown in the figure, a digital broadcast receiving system 1 of the first embodiment transmits a digital television 2 that receives a digital broadcast as an example of the “digital broadcast receiving apparatus” of the present invention, and a blank period data described later. Therefore, the mobile phone 3 as an example of a mobile terminal device having a function of communicating with the digital TV 2 by a communication method such as IrSS (Ir Simple Shot) or Bluetooth, the mobile phone 3 also receives a digital broadcast. And a function of displaying the received digital broadcast. In this example, the mobile phone 3 incorporates remote control software so as to function as a remote controller for the digital television 2, and a remote control signal (remote operation signal) is transmitted to the digital television 2 by a communication method such as IrDA (Infrared Data Association). ).

FIG. 2 is a diagram for explaining a screen displayed on the digital television 2 and the mobile phone 3 and data transmitted from the mobile phone 3 to the digital television 2 when the user uses the digital broadcast receiving system 1 of FIG. It is.
In the digital broadcast receiving system 1 of FIG. 1, for example, when the user switches from channel A currently output on the digital television 2 to another channel as shown in FIG. In order to confirm the contents of the channel to be selected by starting the software, a broadcast of a certain channel is received and output to the mobile phone 3 as shown in FIG. In this system 1, the mobile phone 3 outputs a broadcast of channel B as a certain channel, creates a still image data of the broadcast at the time of reception every time an I frame of the broadcast is received in the background, and creates a digital television. 2 and stored and updated in a memory (not shown) of the television 2.

  Then, as shown in FIG. 2C, a remote control signal instructing the user to switch the channel of the digital television 2 to the channel B is sent from the mobile phone 3 to the digital television 2 based on the confirmation result of the output contents. Sometimes, the digital television 2 performs display output based on the still image data of the channel B stored in the memory in advance until the display based on the current broadcast data of the switching destination channel B becomes possible. When the display based on the current broadcast data of channel B becomes possible, the digital television 2 outputs the actual broadcast of channel B as shown in FIG.

  As described above, in the digital broadcast receiving system 1, the digital television 2 is not shown during the blank period until the broadcast of the channel to be switched to can be displayed when the channel is switched by the user. The image is displayed based on the blank period data (still image data in the above example) of the switching destination channel stored in advance in the memory. However, unlike the conventional one, the cellular phone 3 creates and transmits the blank period data based on the broadcast data at the time of reception each time an I frame is received. Therefore, during the blank period, it is possible to display an image of the broadcast that is very close in time to the current broadcast on the switch-destination channel, so the data currently being broadcast on the switch-destination channel is decoded from the displayed image When the display is switched to the moving image display, the program is unlikely to give an unnatural impression to the user.

  A specific configuration example for performing the above-described operations of the mobile phone 3 and the digital television 2, and a configuration example and a display example of data for the blank period will be described with reference to FIGS. 3 and 5 are block diagrams showing configuration examples of the mobile phone 3 and the digital television 2, respectively, FIG. 4 is a diagram showing a configuration example of data for the blank period, and FIG. 6 is a display control unit of the digital television 2. FIG. 7 is a diagram illustrating an example of a display screen based on blank period data. Since the call function of the mobile phone 3 is not related to the gist of the present invention, the description and illustration of the configuration related to the function are omitted.

  For example, as shown in FIG. 3, the mobile phone 3 includes a touch panel 3a, a keypad 3b, a controller 3c, a touch panel control unit 3d, a keypad control unit 3e, a tuner demodulation unit 3f, a TS demultiplexer 3g, an audio decoder 3h, and a moving image. Image decoder 3i, audio output controller 3j, image display controller 3k, speaker 3l, display 3m, remote control signal transmitter 3n, blank period data generator 3p, first and second short-range communication output devices 3o and 3q And is operated by the user via the touch panel 3a or the keypad 3b.

  The controller 3c controls the mobile phone 3 as a whole, and when the remote controller software is activated, a control signal corresponding to a signal input from the touch panel control unit 3d, the keypad control unit 3e, or the like is sent to the tuner demodulation unit 3f. , TS demultiplexer 3g, audio decoder 3h, moving picture decoder 3i, remote control signal transmission unit 3n, blank period data generation unit 3p, etc. are input and controlled.

The touch panel control unit 3d and the keypad control unit 3e input signals to the controller 3c based on information input from the touch panel 3a and the keypad 3b by the user, for example, operate the keypad 3b. Thus, a signal corresponding to the channel received by the mobile phone 3 is input to the controller 3c. The control units 3d and 3e also input a signal corresponding to the remote control signal transmission determination operation of the channel selection signal to the digital television 2 to the controller 3c.
The tuner demodulator 3f receives the MPEG2-TS broadcast data of the channel indicated by the control signal from the controller 3c and inputs it to the TS demultiplexer 3g.
The TS demultiplexer 3g separates the input MPEG2-TS broadcast data into audio encoded data and moving image encoded data, and inputs them to the audio decoder 3h and the moving image decoder 3i, respectively.

The audio decoder 3h decodes the input encoded audio data and inputs PCM (Pulse Code Modulation) data to the audio output control unit 3j.
The sound output control unit 3j controls the speaker 3l based on the PCM data and outputs sound.
The moving picture decoder 3i decodes the inputted moving picture encoded data and inputs the moving picture data for each frame to the image display control unit 3k.
The image display control unit 3k controls the display 3m based on the moving image data to output a moving image.
Based on the control signal from the controller 3c, the remote control signal sending unit 3n sends a remote control signal such as a channel selection signal via the first short-range communication output device 3o using IrDA as a communication method.
The blank period data generation unit 3p and the second short-range communication output device 3q will be described later.

  With the above configuration, when the user activates the remote control software built in the mobile phone 3 and selects the touch panel 3a and the keypad 3b for a channel to be viewed on the mobile phone 3 for content confirmation, the controller 3c causes the tuner demodulator. By controlling 3f and the like, the broadcast of the selected channel is output via the speaker 3l or the display 3m. In response to the confirmation result of the output content, the user causes the mobile phone 3 to send a remote control signal to the digital television 2 instructing switching from the channel currently being output on the digital television 2 to the channel being output on the mobile phone 3. .

  In the mobile phone 3, at least until the transmission of the above-mentioned remote control signal to the digital television 2 is completed, every time an I frame is input to the moving image decoder 3i, information indicating that is input to the controller 3c. Is done. Further, a still image obtained by decoding an I frame is input from the decoder 3i to the blank period data generation unit 3p, and information on a channel currently being received (displayed) is input from the controller 3c to the data generation unit 3p. Is done. The blank period data generation unit 3p encodes the input still image and generates data X in the JPEG file format in which channel information indicating which channel is embedded as shown in FIG. In the example of FIG. 4, channel information is embedded in the application marker segment X1 of JPEG file data. The generated JPEG file data is transmitted to the digital television 2 as blank period data via the second short-range communication output device 3q using IrSS as a communication method. In this way, in the mobile phone 3, the controller 3c, the blank period data generation unit 3p, and the second short-range communication output device 3q serve as the “data creation / transmission unit” of the present invention to the moving picture decoder 3i with an I frame. Each time is input, blank period data is generated based on the broadcast at the time of input and transmitted to the digital television 2.

  On the other hand, for example, as shown in FIG. 5, the digital television 2 includes a remote control signal interpretation unit 2a, first and second short-range communication input devices 2b and 2n, a channel selection control unit 2c, a channel selection button 2d, and a controller 2e. , Tuner demodulator 2f, TS demultiplexer 2g, audio decoder 2h, video decoder 2i, audio output controller 2j, image display controller 2k, speaker 21, blank period data decoder 2m, still image memory 2o, channel information It has a memory 2p and a display 2q, and is controlled by the user by a remote control signal or the like.

  The remote control signal interpreter 2a determines a remote control signal received by the first short-range communication input device 2b using IrDA or the like as a communication method. For example, when the remote control signal of the channel selection signal is received from the mobile phone 3 The channel information (channel selection information) indicated by the signal is input to the channel selection control unit 2c.

The channel selection control unit 2c sends the signal input from the channel selection button 2d provided integrally with the digital television 2 operated by the user or the channel selection signal input from the remote control signal interpretation unit 2a to the controller 2e. input.
The controller 2e controls the entire digital television 2. The control signal according to the signal input from the channel selection control unit 2c or the like is sent to the tuner demodulation unit 2f, TS demultiplexer 2g, audio decoder 2h, video decoder 2i. These are input to the image display control unit 2k and the like to control them.
The tuner demodulator 2f receives the MPEG2-TS broadcast data of the channel indicated by the control signal from the controller 2e and inputs it to the TS demultiplexer 2g.
The TS demultiplexer 2g separates the input MPEG2-TS broadcast data into audio encoded data and moving image encoded data, and inputs them to the audio decoder 2h and the moving image decoder 2i, respectively.

The audio decoder 2h decodes the input encoded audio data and inputs PCM (Pulse Code Modulation) data to the audio output control unit 2j.
The audio output control unit 2j controls the speaker 2l based on the PCM data and outputs audio.
The moving picture decoder 2i decodes the input moving picture encoded data and inputs the moving picture data to the image display control unit 2k.
The image display control unit 2k will be described later.
The blank period data decoding unit 2m decodes JPEG file data which is blank period data input through the second short-range communication input device 2n using IrSS or the like as a communication method and in which channel information is embedded. The obtained still image and channel information are overwritten and stored in the still image memory 2o and the channel information memory 2p, respectively. The still image memory 2o and the channel information memory 2p are examples of the “data storage unit” in the present invention.

  In the digital television 2, when the controller 2e determines that a remote signal instructing channel switching is input from the mobile phone 3 based on the input from the channel selection control unit 2c, the controller 2e controls and receives the tuner demodulation unit 2f. Switch channels. At the same time, the image display control unit 2k is controlled until the broadcast of the switching destination channel can be displayed, that is, the first intra frame is input to the moving image decoder 2i, and the decoder 2i starts decoding. Until the first frame of the decoded moving image is input to the image display control unit 2k, the still image of the switching destination channel stored in the still image memory 2o is output to the display 2q. Then, when the broadcast of the switching destination channel can be displayed and the blank period elapses, that is, the fact that the first frame of the moving image is input from the moving image decoder 2i to the image display control unit 2k is transferred from the moving image decoder 2i to the controller. When input to 2e, the controller 2e controls the image display control unit 2k to switch from the still image display based on the blank period data to the moving image display of the switching destination channel.

  In this way, since the digital television 2 displays a new still image sent from the mobile phone 3 every time an I frame is received for the switching destination channel during the blank period, the broadcast video of the switching destination channel after the blank period. When switching to display, the program displayed before and after the blank period is not different, and the user is not given an unnatural impression.

  For example, as shown in FIG. 6, the image display control unit 2k includes a moving image plane 2r, a still image plane 2s, a character / graphic plane 2t, and a combining unit 2u controlled by the controller 2e.

When the broadcast data of the channel received by the digital television 2 is displayed as a moving image, an image obtained by decoding the moving image coding is written in the moving image plane 2r to indicate the character information of the data broadcast and information on which channel is being viewed. Character information and the like are written on the character graphic plane 2t, and the decoded image on the planes 2r and 2t and the character information and the like are combined by the combining unit 2u and displayed on the display 2q.
When displaying a still image received from the mobile phone 3, the still image extracted from the still image memory 2o is written to the still image plane 2s, and character information based on the channel information extracted from the channel information memory 2p is stored. It is written in the character graphic plane 2t, and these still images on the planes 2s and 2t, character information, and the like are combined by the combining unit 2u and displayed on the display 2q.

  When the still image received from the mobile phone 3 is displayed, as shown in FIG. 7, together with the still image Y1 and the character information Y2 indicating the channel, the still image Y1 indicates that the mobile phone 3 has created. You may make it display the message Y3 which consists of character information. This message is read from an arbitrary memory, written to the character graphic plane 2t, and synthesized.

FIG. 8 is a flowchart for explaining an example of processing of the mobile phone 3 that functions as a remote controller of the digital television 2.
In the mobile phone 3, when the remote control software is activated (step S1), the user is made to select the channel to be received, and the broadcast of the selected channel is received under the control of the controller 3c (step S2). Display output / audio output is performed (step S3). During output, it is determined whether or not an I frame has been input (step S4). If it has been input, the blank period data generating unit 3p is controlled to receive the I frame image input from the moving image decoder 3i and the current reception. Based on the information of the middle channel, JPEG file data of a still image in which channel information is embedded is generated as blank period data and transmitted to the digital television 2 (step S5). Thereafter, the process proceeds to step S6. On the other hand, if the I frame has not been input (in the case of NO), the process proceeds directly to step S6.

  In step S6, it is determined whether or not switching of the channel to be displayed on the mobile phone 3 is instructed. If instructed (in the case of YES), the process returns to step S2. If not instructed (in the case of NO), it is determined whether or not an instruction to transmit a remote control signal instructing to switch the channel of the digital television 2 to the channel being displayed on the mobile phone 3 is input (step S7). ). If a transmission instruction has not been input (in the case of NO), the process proceeds to step S9 described later. If input (in the case of YES), the remote control signal sending unit 3n is controlled to transmit the remote control signal (step S8), and the process proceeds to step S9. In step S9, it is determined whether or not an instruction to end the remote control software has been input. If not input (in the case of NO), the process returns to step S4, and if input has been input (in the case of YES), the remote control software is ended. To finish the process.

  By performing the processing as described above, the cellular phone 3 can transmit blank period data based on the broadcast at the time of reception to the digital television 2 every time an I frame is received.

(Second embodiment)
In the above example, before transmitting the remote control signal instructing switching to the channel being displayed on the mobile phone 3 to the digital television 2, the blank period data as described above is transmitted every time an I frame is input. However, instead of this, when transmitting the remote control signal, the blank period data as described above may also be transmitted. In this case, the configuration of the mobile phone itself is the same, but the processing in the mobile phone 3 is different. With reference to FIG. 3, the process of the mobile phone 3 of the second embodiment will be described using the flowchart of FIG. In addition, about the process similar to the process demonstrated with the flowchart of FIG. 8, the description is abbreviate | omitted by attaching | subjecting the same step number.

The mobile phone 3 of this example is instructed to transmit a remote control signal instructing to switch the channel of the digital television 2 to the channel being displayed on the mobile phone 3 during the broadcast display output / audio output of the channel selected by the user. It is determined whether or not an input has been made (step S11). When a transmission instruction is input (in the case of YES), the remote control signal transmission unit 3n is controlled to transmit the remote control signal, and the blank period data generation unit 3p is controlled to be input from the moving image decoder 3i. Based on the image of the I frame and the information of the channel currently being received (displayed), the JPEG file data of the still image in which the channel information is embedded is generated as the data for the blank period and transmitted to the digital television 2 (step) S12). Thereafter, the process proceeds to step S13. If no transmission instruction is input (NO in step S11), the process proceeds to step S13.
In step S13, it is determined whether or not switching of the channel to be displayed on the mobile phone 3 is instructed. If instructed (in the case of YES), the process returns to step S2, and if not instructed (in the case of NO). Determines whether an instruction to end the remote control software has been input (step S14). If no termination instruction has been input (NO), the process returns to step S11. If it has been input (YES), the remote control software is terminated and the process is terminated.

  In this way, when the mobile phone 3 transmits a remote control signal instructing channel switching, it creates blank period data based on the broadcast at that time and transmits it to the digital television 2. The digital television 2 displays a still image based on the blank period data until the moving image of the broadcast of the switching destination channel indicated by the remote control signal can be displayed. An image program and a program that displays a moving image are different, and an unnatural impression is not given to the user.

(Third embodiment)
FIG. 10 shows a screen displayed on a digital broadcast receiving device or a mobile phone and data transmitted from the mobile phone to the receiving device when a user uses the digital broadcast receiving system of the third embodiment of the present invention. It is a figure explaining.
In the digital broadcast receiving system of the third embodiment, for example, when the user considers switching from the channel A currently output on the digital television 2 ′ as shown in FIG. As shown in FIG. 10B, a plurality of channels that can be received by the mobile phone 3 ′ are displayed in a multi-channel manner. This multi-channel display is performed by automatically switching channels received by the tuner at predetermined intervals. In the digital broadcast receiving system of this example, the mobile phone 3 ′ generates still image data of the broadcast currently being displayed and output for each channel for each channel in the background while performing multi-screen display. It is transmitted to the digital television 2 'and stored in a memory (not shown) of the television 2'.

Then, as shown in FIG. 10C, when the user sends a remote control signal instructing switching to channel B from the mobile phone 3 ′ to the digital television 2 ′ based on the multi-channel display result, The television 2 'performs display output based on the still image data of the channel B stored in the memory in advance during the blank period until the current broadcast of the switching destination channel B can be displayed. When the current broadcast on channel B can be displayed, the digital television 2 ′ outputs the actual broadcast on channel B as shown in FIG.
In this way, during the blank period, the digital television 2 'can display a still image of a broadcast that is close in time to the current broadcast on the switching destination channel, so that the current broadcast data is displayed from the display of the still image. When the display is switched to the display of the decoded moving image, the program is unlikely to give an unnatural impression to the user.

  A specific configuration example for performing the above-described operation of the mobile phone 3 ′ and the digital television 2 ′ will be described with reference to block diagrams of FIGS. 11 and 12. In addition, about the structure similar to the mobile telephone 3 of FIG. 3, and the digital television 2 of FIG. 5 of the mobile telephone 3 'and the digital television 2', the description is abbreviate | omitted by attaching | subjecting the same referential mark.

  11, unlike the mobile phone 3 ′ shown in FIG. 3, when the remote control software is activated, the controller 3c ′ controls the tuner demodulator 3f so that at least each channel displays an I-frame image. Channels to be received are switched at intervals sufficient to be obtained (in the case of full segment, about 2 to 3 seconds), and MPEG2-TS broadcast data of each channel is input to the TS demultiplexer 3g. Of the broadcast data of each channel, the moving image encoded data is input to the moving image decoder 3i, decoded, and input to the image display control unit 3k 'as moving image data for each frame. The image display control unit 3k 'generates multi-channel screen data by the multi-channel display control unit 3r based on the input moving image data of each channel, and inputs it to the display 3m. As a result, multi-channel screen display in which images of broadcast data of a plurality of channels are displayed on one screen is performed. In the multi-channel screen display, for example, only the image of one channel is a moving image, the image of the other channel is a still image, and the channel on which the moving image is displayed is switched in order.

  In the mobile phone 3 ′, for each channel, every time an I frame is input to the moving image decoder 3i, information indicating that is input to the controller 3c ′, and the decoded still image of the I frame While being input from the decoder 3i to the blank period data generation unit 3p, information on the channel currently being received is input from the controller 3c 'to the data generation unit 3p. The blank period data generation unit 3p generates JPEG file data in which the input still image is encoded to embed channel information, and is transmitted as digital data for the blank period via the second short-range communication output device 3q. 2 '. In this manner, in the mobile phone 3 ′, the controller 3c ′, the blank period data generation unit 3p, and the second short-range communication output device 3q serve as the “data creation transmission unit” of the present invention for each channel. Each time an I frame is input to the image decoder 3 i, blank period data is generated and transmitted to the digital television 2. In other words, each time the channel is switched, blank period data is generated based on the broadcast data of the channel after the switching, and transmitted to the digital television 2 '.

On the other hand, the digital television 2 ′ in FIG. 12 is different from the digital television 2 in FIG. 5, for example, by the blank period data decoding unit 2m decoding blank period data (JPEG file data in which channel information is embedded). Each channel still image memory 2o ′ stores a still image for each channel. The still image memory 2o ′ for each channel is an example of the “data storage unit” in the present invention.
In the digital television 2 ′, when the controller 2e ′ determines that a remote signal instructing channel switching is input from the mobile phone 3 ′ based on the input from the channel selection control unit 2c, the tuner demodulation unit 2f is turned on. Control and switch the receiving channel. At the same time, the image display control unit 2k ′ is controlled to display the still image of the switching destination channel stored in the still image memory 2o ′ for each channel until the moving image display of the switching destination channel becomes possible. Output from. When the broadcast of the switching destination channel can be displayed and the blank period elapses, the controller 2e controls the image display control unit 2k to change from the still image display based on the blank period data to the moving image display of the switching destination channel. Switch.

In this way, the digital TV 2 ′ displays a new still image transmitted by the mobile phone 3 ′ for each channel to be displayed in multi-channels every time an I frame is received during the blank period, so it switches to the video display of the switching destination channel. Does not give the user an unnatural impression.
Also in this example, character information indicating a channel or the like may be displayed superimposed on a still image.

FIG. 13 is a flowchart for explaining an example of processing of the mobile phone 3 ′ functioning as a remote controller for the digital television 2 ′.
In the mobile phone 3 ′, when the remote control software is activated (step S21), the channel received by the tuner demodulator 3f is switched at predetermined intervals, and the broadcast of each channel is received (step S22). Each channel is sequentially decoded and input to the image display control unit 3k ′. Then, the multi-channel screen display is performed by controlling the image display control unit 3k ′ (step S23).

  It is determined whether an I frame is input during multi-screen display (step S24). When input (in the case of YES), the blank period data generation unit 3p is controlled, and the still image obtained by decoding the I frame input from the moving image decoder 3i and the information of the channel through which the I frame is input. Based on this, JPEG file data of a still image in which channel information is embedded is generated as blank period data and transmitted to the digital television 2 '(step S25), and the process proceeds to step S26. In step S24, if an I frame is not input (NO), the process proceeds to step S26 as it is.

  In step S26, it is determined whether or not an instruction to transmit a remote control signal instructing to switch the channel of the digital television 2 'to one specific channel displayed on the multi-channel screen on the mobile phone 3' is input. If the transmission instruction is not input, the process proceeds to step S28 described later. If the transmission instruction is input, the remote control signal transmission unit 3n is controlled to transmit the remote control signal (step S27), and the process is performed. To step S28. In step S28, it is determined whether or not an instruction to end the remote control software has been input. If it has not been input (in the case of NO), the process returns to step S24. End the process.

  By performing the processing as described above, the cellular phone 3 ′ can transmit blank period data based on the broadcast at the time of reception to the digital television 2 every time an I frame is received for a channel that is being displayed in multi-channel. it can.

  Note that two tuners are provided in the mobile phone, one of the two tuners is assigned to display one channel on one screen instead of multi-screen display, and the other tuner has a predetermined receiving channel. For each channel, for example, every time I frame is received, blank period data is generated based on the broadcast at the time of reception and transmitted to the digital television 2 ′, so that each channel is switched. Blank period data may be created based on the broadcast data of the channel after switching and transmitted to the digital television 2 '.

(Fourth embodiment)
FIG. 14 is a block diagram for explaining an example of a cellular phone used in the digital broadcast receiving system according to the fourth embodiment of the present invention. About the mobile phone of a present Example, about the structure similar to the mobile phone 3 of a 1st Example, the description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The mobile phone 3 of the first embodiment creates blank period data based on the broadcast of the channel at the time of reception of the I frame in the channel selected and displayed on the mobile phone 3 and transmits it to the digital television. I kept doing it. On the other hand, the mobile phone 3 '' of this example is similar to the mobile phone 3 of the first embodiment until the program at the start of reception of the selected and displayed channel changes to another program. The blank period data is created and transmitted, but after changing to another program, after transmitting the blank period data based on the broadcast immediately after the change, the channel viewed by the mobile phone 3 is changed. Unless otherwise, the creation / transmission of the blank period data for each reception of the I frame is stopped. After the stop, for example, every time the program is changed to another program, blank period data based on the broadcast immediately after the change may be created / transmitted.

  For example, as shown in FIG. 14, the mobile phone 3 ″ has an EPG storage unit 3s for storing electronic program guide data and the current channel currently displayed on the mobile phone 3 ″. And a switching time storage unit 3t for storing the time when the program is switched to another program.

When the channel to be viewed is selected or switched while the remote control software is running, the mobile phone 3 '' starts outputting the broadcast of the channel and simultaneously refers to the EPG storage unit 3s to The time at which the channel program switches to another program is determined and stored in the switching time storage unit 3t. As long as the channel viewed by the mobile phone 3 ″ is not changed, the blank period data is received every time an I frame is received, up to the time stored in the switching time storage unit 3t, as in the mobile phone 3 of the first embodiment. However, when the time has elapsed, after the blank period data based on the broadcast immediately after the transmission is transmitted, the creation and transmission of the blank period data for each reception of the I frame is stopped. Each time the program is switched, blank period data based on the broadcast immediately after the change is created / transmitted.
As described above, in the mobile phone 3 ″, the controller 3c ″, the blank period data generation unit 3p, the second short-range communication output device 3q, and the switching time unit 3t are the “data creation transmission unit” of the present invention. As described above, the output data is generated and transmitted every time the program in the channel being displayed on the mobile phone 3 ″ is switched.

  In this way, power consumption can be suppressed. In addition, since the broadcast immediately after the program is switched often includes the title of the program to which the program is switched or is a familiar standard opening scene, the data for the blank period based on such a broadcast is digitally displayed. By transmitting to the television and displaying it, the contents of the program that the user will view in the blank period can be confirmed again.

  When creating / transmitting blank period data based on the broadcast immediately after the change every time the program changes to another program, the blank period data based on the broadcast at that time is used every 20 to 30 seconds until the program changes to another program. May be created / sent.

  Even when multi-channel screen display is performed as in the third embodiment, for each channel, every time an I frame is received, until the time at which the program of that channel at the start of output is switched to another program, as in the above case. When the blank period data is created and transmitted and changed to another program, the blank period data based on the broadcast immediately after the change is transmitted, Creation / transmission may be stopped.

  As in the second embodiment, when the mobile phone 3 also transmits the blank period data when sending the remote control signal, the mobile phone 3 displays the same channel for a long time, and the program has changed since the start of display. In this case, the data for the blank period of the broadcast immediately after the change may be stored and transmitted together with the remote control signal. Similarly to the fourth embodiment, the EPG storage unit that stores electronic program guide data and the switching time storage that stores the time when the current program of the channel currently displayed on the mobile phone is switched to another program are stored. This can be achieved if the mobile phone is provided with a department.

  In the first, third, and fourth embodiments, when a remote control signal instructing channel switching is input from a mobile phone, the digital television displays an image during the blank period based on the blank period data created by the mobile terminal. However, the same display may be performed when a remote control signal instructing channel switching is input via a remote control of a digital television or a channel selection button of the digital television other than the portable terminal.

In each of the above-described embodiments, it is preferable that the blank period data generation unit of the mobile phone has a function of enlarging or reducing the input image so as to fit the screen size of the digital television.
In each of the above-described embodiments, JPEG is used as the still image data format, but an MPEG2 I-frame format may be used.

In each of the above-described embodiments, an image obtained by decoding an I frame is used as a still image used when creating blank period data. However, another decoded image of one frame may be used. In each of the above embodiments, the mobile phone creates / transmits still image data as blank period data, but creates / transmits moving image data or moving image data with audio data. Also good. As the moving image data, for example, a moving image of about 5 seconds having a frame rate lower than that of the moving image received by the mobile phone can be considered.
In each of the embodiments described above, the mobile phone has a full-segment tuner, but may be a one-segment tuner. In this case, the interval for switching the channel received by the tuner in the mobile phone 3 ′ of the third embodiment is about 5 seconds. When a one-segment tuner is used for a mobile phone, when sending moving image data or moving image data with audio data to a digital television having a full-segment tuner, the data of the MPEG4 compression method used in one-segment broadcasting is used. The data may be converted (transcoded) into MPEG-2 compression format data used in full segment.

  The digital TV may display the channel broadcast received by the mobile phone 3 on the sub-screen based on the blank period data. Thereby, the back program can be checked by anyone other than the person who operates the mobile phone 3.

  The example in which the mobile terminal device is configured by a mobile phone has been described above. However, the mobile terminal device may be configured by a PDA (Personal Digital Assistance) or a digital TV remote controller.

DESCRIPTION OF SYMBOLS 1 ... Digital broadcast receiving system, 2 ... Digital television, 2a ... Remote control signal interpretation part, 2b ... 1st near field communication input device, 2c ... Channel selection control part, 2d ... Channel selection button, 2e ... Controller, 2f ... Tuner Demodulator 2g TS demultiplexer 2h Audio decoder 2i Video decoder 2j Audio output controller 2k Image display controller 2l Speaker 2m Blank period data decoder 2n 2 near field communication input devices, 2o ... still image memory, 2o '... still image memory for each channel, 2p ... channel information memory, 2q ... display, 2r ... moving image plane, 2s ... still image plane, 2t ... character graphic plane 2u: synthesis unit 3, 3 ', 3''... mobile phone, 3a ... touch panel, 3b ... keypad, 3c ... controller, 3d ... Panel control unit, 3e ... keypad control unit, 3f ... tuner demodulation unit, 3g ... TS demultiplexer, 3h ... audio decoder, 3i ... controller, 3i ... moving picture decoder, 3j ... audio output control unit, 3k ... image display control Part, 3l ... speaker, 3m ... display, 3n ... remote control signal sending part, 3n ... still image encoder,
3o ... 1st short-range communication output device, 3o ... 1st short-range communication output device, 3p ... Blank period data generation part, 3p ... Still image encoder, 3q ... 2nd short-range communication output device, 3r ... Multi-channel display control unit, 3s... EPG storage unit, 3t... Switching time storage unit.

Claims (11)

A digital broadcast receiving system comprising a digital broadcast receiving device and a mobile terminal device having a function of communicating with the digital broadcast receiving device and a function of receiving and displaying the digital broadcast,
The portable terminal device generates output data including image information of broadcast data being received on the selected channel and channel information indicating which channel is being transmitted, and transmits the output data to the digital broadcast receiver A data creation and transmission unit
The digital broadcast receiving device has a data storage unit for storing the output data received from the mobile terminal device, and at the time of channel switching, from the channel switching until display based on broadcast data of a predetermined channel becomes possible In the meantime, when output data for the channel is stored in the data storage unit, a display based on the output data is performed.   The digital broadcast receiving system according to claim 1, wherein the data creation / transmission unit of the portable terminal device creates and transmits the output data every time an intra frame of the broadcast data is received.   The portable terminal device further has a function of transmitting a remote control signal to the digital broadcast receiving device, and receives a remote control signal instructing to switch the channel of the digital broadcast receiving device to a channel being displayed on the portable terminal device. 2. The digital broadcast receiving system according to claim 1, wherein, when transmitting, the data creation / transmission unit creates and transmits the output data based on broadcast data of the channel being displayed.   The portable terminal device further has a function of automatically switching a channel received by the portable terminal device, and the data creation and transmission unit outputs the output based on the broadcast data of the channel after switching every time the channel is switched. 2. The digital broadcast receiving system according to claim 1, wherein data is created and transmitted.   5. The digital broadcast receiving system according to claim 4, wherein the mobile terminal device automatically displays and outputs broadcast data images of a plurality of channels on one screen.   The portable terminal device further includes a storage unit that stores an electronic program guide, and the data creation / transmission unit switches at least a program in a channel being displayed on the portable terminal device based on the electronic program guide. The digital broadcast receiving system according to claim 1, wherein the output data is generated and transmitted.   The digital broadcast receiving system according to claim 1, wherein the image information is still image data.   The digital broadcast receiving system according to claim 1, wherein the image information is transcoded moving image data.   The digital broadcast receiving system according to claim 8, wherein the output data includes audio data.   2. The digital broadcast receiving device, when performing display based on the output data, displays a message indicating that the output data is created by the mobile terminal device. 9. The digital broadcast receiving system according to any one of 9 above.   The portable terminal device which comprises the digital broadcast receiving system of any one of Claims 1-10.

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