JP2007214794A - Mobile terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal device that enables a viewer to view information on desired contents even when the reception intensity of a broadcast radio wave decreases. <P>SOLUTION: The mobile terminal device is provided with a reception state measuring means 13 of measuring the reception state of the broadcast radio wave that a broadcast reception section 12 receives, a server managing means 14 of managing at least the location of a specified server 40 made to correspond to the broadcast wave that a broadcast reception section is to receive, and a content reproduction control means 15 of connecting a communication line to the specified server by using management information of the server managing means when deterioration of the reception state exceeding a predetermined extent is detected based upon the measurement result of the reception state measuring means to acquire subordinate digital contents related to the digital contents from the server, and also reproducing the subordinate digital contents instead of the digital contents by a content reproduction section. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile terminal device capable of receiving a digital broadcast including viewable content such as a television program or a radio program.

  In recent years, content that can be viewed such as a television program and a radio program is transmitted as a digital broadcast from a broadcast station on a broadcast radio wave. It has also been proposed to install a function for receiving such broadcast waves and viewing the broadcast content in a mobile terminal device such as a mobile phone terminal or a PDA (Personal Digital Assistant).

  For example, in an environment in which a receiving antenna is fixed, such as a television receiver installed in a home, radio waves from a broadcasting station can be received under certain relatively favorable conditions, so that the reception state is hardly deteriorated. However, when a broadcast radio wave is received using a mobile terminal device, the reception state is likely to deteriorate. That is, even while the viewer is viewing content such as a television broadcast, the mobile terminal device that receives the broadcast may move with the viewer, so the mobile terminal device receives the broadcast. The environment changes greatly with movement. Accordingly, it is inevitable that the reception intensity of radio waves when the mobile terminal device receives a broadcast fluctuates during content viewing.

  When the reception environment changes and the reception intensity of the radio waves received by the mobile terminal device decreases significantly, the broadcast digital content cannot be played back correctly. For example, the TV program being viewed is interrupted during playback, It will be in a state that can not be displayed.

For example, Patent Document 1 discloses a conventional technique related to an apparatus that receives and displays character information multiplexed and transmitted on broadcast radio waves. Patent Document 1 proposes to suppress display of character information when radio wave reception intensity is reduced in order to prevent erroneous display of characters.
Japanese Patent Laid-Open No. 2001-119111

  If the technique of Patent Document 1 is adopted, it is possible to prevent erroneous data generated as a result of a decrease in radio wave reception intensity from being output as displayed characters. However, in an environment where the reception intensity of broadcast radio waves is reduced, the viewer cannot view the content at all. Although it is a problem to output incorrect contents and noise in an environment where the reception intensity of broadcast radio waves is reduced, it is not preferable for the viewer that the contents cannot be viewed at all.

  An object of the present invention is to provide a portable terminal device that can view information of content desired by a viewer even when the reception intensity of broadcast radio waves is reduced.

  A first invention (Claim 1) includes a broadcast receiving unit that receives a predetermined broadcast wave including digital content such as a television program, a content reproduction unit that reproduces information of the received digital content, and a predetermined communication network. A mobile communication device comprising a digital communication unit for connecting to and communicating with an arbitrary server arranged in a receiving state measuring means for measuring a receiving state of a broadcast wave received by the broadcast receiving unit, Based on the measurement result of the reception status measuring means and the server management means for managing at least the location of the specific server associated with the broadcast wave to be received by the broadcast receiving unit, a predetermined deterioration of the reception status is detected. In this case, a communication line is connected to a specific server using the management information of the server management means, and the sub-digital computer related to the digital content is connected from the server. Get the Ntsu reproduces the secondary digital content by the content reproduction unit in place of the digital content, characterized in that a content reproduction control means.

  In the first invention, as sub-digital content, information related to the main digital content transmitted on the broadcast wave, such as video data in which the content is the same as the main digital content and compressed and encoded at a high compression rate, It is assumed that audio data, subtitle text data, and the like are prepared on a specific server in advance. When the reception state of the broadcast wave deteriorates and the main digital content cannot be reproduced, the sub digital content is automatically acquired from the specific server and reproduced under the control of the content reproduction control means. Therefore, the viewer can view the sub-digital content even when the reception state of the broadcast wave deteriorates. As for the degree of deterioration of the reception state, for example, the reception intensity of the radio wave of the broadcast wave, the error occurrence rate in the received signal, etc. may be monitored.

  According to a second invention (invention 2), in the first invention, the content reproduction control means uses a first threshold value that is different from the measurement result of the reception state measurement means in order to detect the degree of deterioration of the reception state. And the acquisition of the sub digital content from the corresponding server when it is detected that the reception state has deteriorated below the first threshold, and the reception state deteriorates below the second threshold. When it is detected that the sub-digital contents have been reproduced, the reproduction output of the sub-digital contents is started.

  For example, even when the location information indicating the location of a specific server holding the secondary digital content is included in the broadcast wave, the main digital content transmitted on the broadcast wave cannot be reproduced. When the reception state deteriorates, the location information cannot be extracted from the received broadcast wave. In addition, there is a certain time delay from the start of the operation for acquiring the sub digital content until the sub digital content can actually be reproduced.

  In the second aspect of the invention, since the reception state is identified using two types of threshold values, an operation for acquiring the sub digital content may be started before the reception state deteriorates to such an extent that the main digital content cannot be reproduced. it can. Accordingly, when it is detected that the reception state has deteriorated to such an extent that the main digital content cannot be reproduced, the reproduction of the sub digital content can be started immediately.

  According to a third invention (Claim 3), in the first invention or the second invention, the server management means is configured to locate a specific server from information included in a broadcast wave received by the broadcast receiver. The content reproduction control means connects a communication line with a specific server according to the server location information held by the server management means, and stores the sub digital content. It is characterized by acquiring.

  In the third aspect of the invention, the server location information indicating the location of the specific server holding the sub digital content to be acquired is extracted from the broadcast wave and used. Therefore, when the sub digital content is acquired, the connection destination of the server It is possible to reduce the time required to acquire the sub-digital contents. In addition, it is possible to perform control so that the server is switched as necessary on the broadcast wave transmission side.

  According to a fourth invention (Claim 4), in the first invention, when there are a plurality of sets of contents having at least one of different data types and data sizes as the corresponding sub-digital contents, the content reproduction control means, A part of content is preferentially selected from a plurality of sets of contents, and the selected part of content is acquired from a specific server and reproduced by the content reproduction unit.

  In the fourth aspect of the invention, it is assumed that there are a plurality of sets of contents having different data types and data sizes as sub-digital contents. For example, assuming a television program, a plurality of types of contents such as audio data, video data, subtitle text data, and data broadcasting data may exist as sub-digital contents. Also, for example, a plurality of contents having the same contents but differing only in the data amount and the bit rate at the time of reproduction may exist as sub-digital contents. Although it is possible to acquire and play all types of sub-digital content or sub-digital content with the largest amount of data, there are many restrictions on data communication in the environment of mobile terminal devices. There is a problem that it takes a long time to acquire sub-digital contents. However, in the fourth aspect of the invention, since some contents are preferentially selected and acquired from a plurality of sets of contents, it is possible to acquire and reproduce necessary sub-digital contents in a relatively short time. .

  According to a fifth invention (Claim 5), in the fourth invention, the content reproduction control means determines the priority of the digital content or the digital content from the information included in the broadcast wave received by the broadcast receiver. Specified information representing the type of the selected content, preferentially select some content from a plurality of sets according to the content of the extracted specified information, and obtain the selected selected content from a specific server The content is reproduced by the content reproduction unit.

  In the fifth aspect, since some contents are preferentially selected and acquired according to the contents of the designation information extracted from the broadcast wave, the priority sub-digital contents can be automatically selected. Therefore, according to the type of program of the main digital content included in the broadcast wave, it is possible to select the most suitable type of sub digital content. For example, if the TV program of the main digital content is a music program, the priority order is set so that audio data is acquired first, the subtitle text data for displaying lyrics is set at the second priority level, and If the video data is set to the third priority order and is controlled so that these data are acquired sequentially, it is possible to acquire and play the content that is highly necessary first. As a result, even when the communication performance between the mobile terminal device and the server is not so excellent, the user of the mobile terminal device can quickly grasp the contents of the TV program content.

  According to the present invention, a user of a mobile terminal device can view sub-digital content instead of main digital content even when the reception state deteriorates due to movement of the terminal or the like.

Specific embodiments relating to the mobile terminal device of the present invention will be described below with reference to FIGS.
FIG. 1 is a block diagram illustrating a configuration example of a system including a mobile terminal device according to an embodiment. FIG. 2 is a flowchart showing an operation example (1) of the main part of the mobile terminal device shown in FIG. FIG. 3 is a flowchart showing an operation example (2) of the main part of the mobile terminal device shown in FIG. FIG. 4 is a flowchart showing an operation example (3) of the main part of the mobile terminal device shown in FIG. FIG. 5 is a flowchart showing an operation example (4) of the main part of the mobile terminal device shown in FIG. 6 is a front view showing a display example of the screen on the mobile terminal device shown in FIG. FIG. 7 is a schematic diagram showing a specific example of program supplement information. FIG. 8 is a schematic diagram showing an actual configuration example of the program supplement information. FIG. 9 is a schematic diagram showing a basic configuration of a TS packet.

  In this embodiment, it is assumed that the mobile terminal device 10 shown in FIG. 1 has a function of receiving a digital broadcast radio wave including content such as a television program and reproducing the broadcast content. Further, the mobile terminal device 10 is assumed to have a communication function for connecting to a communication network such as the Internet and performing data communication with an arbitrary server, such as a general mobile phone terminal or PDA. Yes.

  As shown in FIG. 1, the broadcasting station 20 includes program databases 21 and 22 that store a large amount of information related to programs such as televisions and radios to be broadcast. Since the case of digital broadcasting is assumed in this example, the program database 21 includes audio data encoded as a predetermined digital signal, video data, and data broadcasting data as program content for each program. Is retained. The program database 22 holds program supplement information as will be described later.

  The broadcast wave transmission facility 30 is a transmission facility for transmitting radio waves including content such as a television program to be broadcast. When actually broadcasting, a specific program content determined by a predetermined schedule in the program database 21 is transmitted from the broadcast station 20. The program content transmitted by the broadcast station 20 is transferred to the broadcast wave transmission facility 30 via a dedicated communication line, and the broadcast wave transmission facility 30 transmits the transferred program content on the broadcast radio wave.

  In addition, in order to be able to distribute content equivalent to or related to program content transmitted on broadcast radio waves to any receiving station via the Internet, the distribution server 40 managed by the broadcasting station 20 uses the Internet. Is placed on top. The distribution server 40 is provided with a plurality of servers 41, 42, 43,... For redistributing program information and a program information redistribution server management unit 45.

  The broadcast station 20 uploads each program content on the program database 21 and the program supplement information on the program database 22 to the distribution server 40 before the time of the broadcast schedule. In the example shown in FIG. 1, a plurality of servers 41, 42, 43,... Are provided on the distribution server 40, and different types of data are uploaded to each. For example, the server 41 stores simple moving picture content in “MPEG” format, the server 42 stores “JPEG” format image content, and the server 43 stores “TXT” format subtitle content. The

  In addition to the functions of a general mobile terminal, the mobile terminal device 10 includes a broadcast receiving antenna 11, a broadcast wave receiving unit 12, a radio level detecting unit 13, and a program information acquisition managing unit 14, as shown in FIG. And a program content presentation control unit 15.

  The broadcast wave receiving unit 12 is a front end, that is, a tuner that receives broadcast radio waves such as digital television broadcasts input via the broadcast receiving antenna 11, and extracts broadcast content information (program content) from the broadcast radio waves. It has a function.

  The program content extracted from the broadcast wave by the broadcast wave receiving unit 12 is reproduced under the control of the program content presentation control unit 15, the visible information included in the program content is displayed on a display screen 50 as shown in FIG. Output from a speaker (not shown).

  The display screen 50 of the mobile terminal device 10 is divided into five display areas 51 to 56 as shown in FIG. That is, the display area 51 is used for displaying the television program reception display section 56 and the reception status display section 57, the display area 52 is used for displaying video, and the display area 53 is used for displaying subtitles. The display area 54 is used for displaying data of data broadcasting, and the display area 55 is used for displaying program information.

  By the way, when the broadcast content transmitted from the broadcast wave transmission facility 30 is received and the program content is reproduced, the high-quality content can be viewed without using a pay or free special communication network. . However, since the mobile terminal device 10 is not fixed, it is not always possible to receive broadcast waves in a good state. For example, when the mobile terminal device 10 moves to a place where broadcast radio waves are difficult to reach, the electric field intensity of the radio waves received by the broadcast receiving antenna 11 is reduced or the influence of multipath is increased. Is interrupted, or the frequency of occurrence of data errors increases and reception becomes impossible.

  Therefore, when the reception state of the broadcast radio wave deteriorates, the mobile terminal device 10 shown in FIG. 1 connects the distribution server 40 and the communication line via the Internet, and the currently broadcast content (main content) and the content Are downloaded from the distribution server 40, and the sub-content is controlled to be reproduced on the mobile terminal device 10 instead of the main content.

  In order to check the reception state of the broadcast wave, the wireless level detection unit 13 on the mobile terminal device 10 checks the state of the internal signal of the broadcast wave reception unit 12 and determines the electric field strength of the broadcast wave received by the mobile terminal device 10. Gradually grasp.

  The program information acquisition management unit 14 uses a wireless communication function provided in the mobile terminal device 10 when the wireless level detection unit 13 detects deterioration of the reception state of the broadcast radio wave. Then, a communication line is connected, and the Internet is connected via the wireless base station, and the distribution server 40 arranged on the Internet is accessed. Then, the sub-content data existing on the distribution server 40 is downloaded.

  The sub-content downloaded from the distribution server 40 by the program information acquisition management unit 14, that is, the program information, is processed by the program content presentation control unit 15 and output to the display screen 50 or the like.

  For example, when there are a plurality of types of content such as “MPEG” format simple moving images, “JPEG” format images, “TXT” format subtitles, etc., the program content presentation control unit 15 is necessary. The type of sub-content and the acquisition order are determined, and the server holding the sub-content is selected.

  When the location of the distribution server 40 is fixed in advance, URL (Uniform Resource Locators) or IP address information indicating the location of the distribution server 40 is stored in the memory on the mobile terminal device 10 in advance. Thus, the target distribution server 40 can be accessed.

  Further, as shown in FIG. 1, when the broadcasting station 20 manages the distribution server 40, the broadcasting station 20 always knows where the distribution server 40 is located. It is also possible to send the URL or IP address information along with the program content on a broadcast radio wave. In that case, the mobile terminal device 10 extracts and uses the URL or IP address information of the distribution server 40 holding the sub-content corresponding to the currently received program content from the received broadcast radio wave. it can. Accordingly, it is possible to cope with the change of the distribution server 40.

  For example, when the distribution server 40 is managed by a service provider independent of the broadcast station 20, information indicating the location of the distribution server 40 cannot be placed on the broadcast radio wave. Information indicating the location of the distribution server 40 can be provided to the mobile terminal device 10 when the user using the service contracts with the service provider. For example, the mobile terminal device 10 can be used to search information on the Internet. It is also possible to access and specify the location of the distribution server 40.

  In the distribution server 40 shown in FIG. 1, the program information redistribution server management unit 45 manages a plurality of servers 41, 42, 43,. When the program information acquisition management unit 14 of the mobile terminal device 10 inquires of the program information redistribution server management unit 45 about the program information of the currently broadcast program, the program information redistribution server management unit 45 selects the corresponding type of program. A server holding information is found from a plurality of servers 41, 42, 43,..., Target program information is extracted, and distributed to the program information acquisition management unit 14 of the mobile terminal device 10.

A specific operation example of the mobile terminal device 10 shown in FIG. 1 will be described below. First, an operation example shown in FIG. 2 will be described.
In step S11 shown in FIG. 2, in accordance with an input operation from a user using the mobile terminal device 10, the operation of the broadcast wave receiving unit 12 is activated so that a broadcast TV program can be viewed, and broadcast radio waves are received. Start.

  In step S12, the content of the TV program extracted from the broadcast wave received by the broadcast wave receiving unit 12, that is, the video, audio, and subtitle character information is reproduced and displayed on the display screen 50 on the mobile terminal device 10 and the speaker. Outputs sound such as voice.

  In step S <b> 13, the radio level detection unit 13 acquires information indicating the reception intensity of the broadcast radio wave from the broadcast wave reception unit 12. This process is repeatedly executed at regular time intervals.

  In step S14, the latest value of the broadcast radio wave reception intensity detected in step S13 is compared with a predetermined threshold value to identify whether or not the broadcast reception state has deteriorated. That is, if the reception electric field strength of the broadcast radio wave received by the mobile terminal device 10 is equal to or less than the threshold value, the reception of the broadcast becomes difficult and the reproduction of the content is interrupted or the broadcast cannot be completely received. And the threshold value are compared to check whether the broadcast reception state has deteriorated. If the broadcast reception state deteriorates, the process proceeds from step S14 to step S19. If the broadcast can be received, the process proceeds to step S15.

  In step S15, the “reception state deterioration flag” indicating that the broadcast reception state has deteriorated is turned off to clearly indicate that the broadcast can be received.

  In step S <b> 16, it is checked whether the content currently reproduced on the display screen 50 on the mobile terminal device 10 is the sub-content received from the distribution server 40. When the main content included in the broadcast wave received by the broadcast wave receiving unit 12 has already been reproduced and output to the display screen 50 or the like, the process proceeds to step S13, and when the sub content is reproduced, the process proceeds to step S17. .

  In step S17, the content to be reproduced by the program content presentation control unit 15 is switched from the sub content to the main content, and the broadcast wave receiving unit 12 outputs the main content extracted from the broadcast wave to the display screen 50 or the like.

  In step S18, since it is no longer necessary to reproduce the sub-content, the program information acquisition management unit 14 stops acquiring the program information from the distribution server 40.

  In step S19, a “reception state deterioration flag” indicating that the reception state of the broadcast has deteriorated is turned on to clearly indicate that the broadcast (main content) cannot be received.

  In step S20, the program information acquisition management unit 14 establishes a communication line with a predetermined radio base station using the radio communication function of the mobile terminal device 10, and further connects to the Internet via the radio base station. Then, the subsidiary content of the necessary TV program is acquired by accessing the distribution server 40 arranged on the Internet. In this example, since it is assumed that the address of the distribution server 40 is fixed, information on the URL and IP address of the distribution server 40 specified in advance is held in advance on the program information acquisition management unit 14. Then, this information is used to identify the distribution server 40 that is the connection destination.

  In step S21, since the broadcast (main content) cannot be received, the program content presentation control unit 15 switches the content to be reproduced from the main content to the sub content. In other words, the program information acquisition management unit 14 reproduces the subsidiary content of the television program acquired from the distribution server 40 and outputs it to the display screen 50 on the mobile terminal device 10.

  By the way, the reproduction of the sub content cannot be started at the same time when the program information acquisition management unit 14 starts the preparation for acquiring the sub content. That is, the waiting time for the program information acquisition management unit 14 to connect a communication line with the distribution server 40, the waiting time for the distribution server 40 to search for the desired sub-content, and the sub-contents necessary for reproduction Waiting time to download data is required.

  Therefore, when the operation shown in FIG. 2 is performed, a waiting time occurs when the content to be played is switched from the main content to the sub content, and both the main content and the sub content are played during the waiting time. I can't.

  In order to solve the problem related to the waiting time, it is desirable to perform an operation as shown in FIG. The operation example shown in FIG. 3 is a modification of FIG. 2, and the steps corresponding to those in FIG. 2 are given the same numbers in FIG. In FIG. 3, processing different from FIG. 2 will be described below.

  In step S31 of FIG. 3, the latest value of the broadcast radio wave reception intensity detected in step S13 is compared with a predetermined predictive threshold value to identify whether or not the broadcast reception state is expected to deteriorate. That is, since the reception state of broadcast radio waves received by the mobile terminal device 10 often gradually deteriorates with time, even if the broadcast can be received with sufficient quality, the received electric field strength of the broadcast radio waves If the value falls below the predictive threshold, it is considered that there is a high possibility that it will be difficult to receive broadcasts within a predetermined time and content playback will be interrupted, or that broadcasts will not be completely received. Therefore, it is examined whether or not the broadcast reception state is expected to deteriorate by comparing the received electric field strength with the predictive threshold. If the broadcast reception state is likely to deteriorate, the process proceeds from step S31 to step S34, and if there is no sign of deterioration, the process proceeds to step S32.

  In step S32, the “reception state deterioration flag” indicating that the broadcast reception state has deteriorated is turned off to clearly indicate that the broadcast can be received, and the “reception state deterioration predictor flag” is turned off. Clarify that there are no signs of deterioration.

  In step S34, the next process is changed according to the state of the “reception state deterioration sign”. That is, when the “reception state deterioration sign flag” is off, the process proceeds to step S35, and when the “reception state deterioration sign flag” is on, the process proceeds to step S37.

  In step S35, the “reception state deterioration predictor flag” is turned on to clearly indicate that a sign of reception state deterioration is recognized.

  In step S36, as in step S20 described above, the program information acquisition management unit 14 establishes a communication line with a predetermined radio base station using the radio communication function of the mobile terminal device 10, and further, the radio base station Is connected to the Internet via the Internet, accesses the distribution server 40 arranged on the Internet, and acquires the sub-contents of the necessary TV program. However, at this stage, only the sub-content acquisition operation is started, and for the content that is actually output to the display screen 50 on the mobile terminal device 10 or the like, the reproduction of the main content acquired from the broadcast radio wave is continued.

  In step S37, the latest value of the reception intensity of the broadcast radio wave detected in step S13 is compared with a predetermined deterioration threshold value to identify whether or not the broadcast reception state has deteriorated. Note that “predictive threshold”> “deterioration threshold”. In other words, when the received electric field strength of the broadcast radio wave is below the deterioration threshold, it becomes difficult to receive the broadcast and the content playback is interrupted or the broadcast cannot be completely received, so the reception state deteriorates to such a state. Check whether or not. If the broadcast reception state deteriorates, the process proceeds from step S37 to step S19, and if not yet deteriorated, the process proceeds to step S36.

  Therefore, for example, an operation as shown in FIG. 6 is realized. That is, when the received electric field intensity is high enough to allow the mobile terminal device 10 to receive the broadcast radio wave in a good state, the display areas 52 to 55 are extracted from the broadcast radio wave as shown in FIG. The contents of the main content (video data, caption data, data broadcasting data, program information data, etc.) are displayed. When the received electric field strength is smaller than the “predictive threshold value”, the main content is continuously output to the display screen 50 as shown in FIG. 6B, but the acquisition of the sub content from the distribution server 40 is started. To do. When the received electric field strength becomes smaller than the “deterioration threshold value”, as shown in FIG. 6C, the content to be displayed on the display screen 50 is acquired from the distribution server 40 (for example, caption data, program information data). Only) immediately.

  Next, the operation example shown in FIG. 4 will be described. The operation example shown in FIG. 4 is a modification of FIG. 3, and the steps corresponding to those in FIG. 3 are given the same numbers in FIG. In FIG. 4, processing different from FIG. 3 will be described below. In the operation example shown in FIG. 4, the broadcast wave transmitted by the broadcast wave transmission facility 30 includes a URL or IP address information indicating the location of the distribution server 40 as redistribution source specifying information. Assumed.

  In step S41 of FIG. 4, redistribution source specifying information included in the broadcast wave received by the broadcast wave receiving unit 12 is extracted.

  In step S20B and step S36B, the program information acquisition management unit 14 establishes a communication line with a predetermined radio base station using the radio communication function of the mobile terminal device 10, and further passes the Internet via the radio base station. And the distribution server 40 arranged on the Internet is accessed to obtain the necessary subsidiary content of the TV program. In the example shown in FIG. 4, since the redistribution source specifying information indicating the location of the distribution server 40 is included in the received broadcast radio wave, the URL of the distribution server 40 or the distribution server 40 is extracted from the redistribution source specifying information extracted in step S41. An IP address is specified, and this URL or IP address is connected to the distribution server 40 as a connection destination.

  Next, the operation example shown in FIG. 5 will be described. The operation example shown in FIG. 5 is a modification of FIG. 4, and the steps corresponding to those in FIG. 4 are given the same numbers in FIG. In FIG. 5, processing different from FIG. 4 will be described below. In the operation example shown in FIG. 5, a case where the broadcast radio wave transmitted by the broadcast wave transmission facility 30 includes URL or IP address information indicating the location of the distribution server 40 as redistribution source specifying information. Assumed. In addition, the broadcast radio waves transmitted by the broadcast wave transmission facility 30 include program supplement information as shown in FIGS.

  In step S42 of FIG. 5, program supplement information including redistribution source identification information and priority information is extracted from the broadcast radio waves received by the broadcast wave receiving unit 12.

  In step S44 and step S45, the program information acquisition management unit 14 establishes a communication line with a predetermined radio base station using the radio communication function of the mobile terminal device 10, and further, the Internet via the radio base station. And the distribution server 40 arranged on the Internet is accessed to obtain the necessary subsidiary content of the TV program.

  However, when multiple types of content are prepared on the distribution server 40 as sub-contents, specific content with the highest priority is preferentially acquired among the contents that have not yet been acquired in steps S44 and S45. To do.

  The program supplement information is managed independently for each broadcast station as shown in FIG. 7, and the program supplement information of each broadcast station includes a program name, a program genre, priority information, Distribution source specific information is included. As for priority information, different priorities are assigned to each of a plurality of different types of sub-contents corresponding to one program.

  For example, for a certain broadcasting station, “character information 1” assigned “priority A”, “character information 2” assigned “priority B”, and “priority C” assigned “ "Simple video" is prepared as a sub-content in each of server C, server D, and server A included in distribution server 40. Each priority order has a relationship of “(priority A”> “priority B”> “priority C”). Therefore, when the mobile terminal device 10 downloads sub-contents from the distribution server 40, the sub-content of “character information 1” having the highest priority is downloaded first, and after the completion, the second priority is given. "Character information 2" is downloaded, and after that is completed, the "priority video" having the third priority is downloaded.

  Such priorities can be determined according to the order of necessity on the viewer side determined for each genre of the broadcast program, the time required for downloading, the data size, the speed of the communication line used, etc. Good. For example, the type of sub-content that gives a relatively high priority can be automatically determined on the mobile terminal device 10 side according to the genre of the program.

  In the actual program supplement information, as shown in FIG. 8, priority information in which information indicating the type of sub-content giving priority for each priority is described in order, and the priority for each priority. Redistribution source specifying information in which IP addresses of servers holding sub contents to be given are described in order.

  In current digital broadcasting, broadcast data is transmitted using a signal called a transport stream (TS) or a transport packet as shown in FIG. In this transport stream, the priority information and redistribution source identification information described above can be included and transmitted as a broadcast. In actual digital broadcasting, information defined as a PSI / SI (Program Specific Information / Service Information Program Arrangement Information) table is included in the transport stream and transmitted, but this PSI / SI table is extended and defined. By doing so, it is possible to transmit the transport stream including information as shown in FIG.

  Note that PSI is transmission control information standardized by ISO / IEC13818-1, and information for realizing a function for the receiver to automatically demultiplex and decode various multiplexed program streams. provide. SI is digital data describing the distribution system, contents, schedule / timing, etc. of the program sequence information broadcast data stream.

  In the above embodiment, the deterioration of the reception state is grasped by comparing the reception electric field strength of the broadcast radio wave with a threshold. For example, the occurrence rate of bit errors occurring in the received data and the signal power to noise power ratio It is also possible to grasp the reception state using (S / N).

  As described above, even when the main content cannot be reproduced due to a decrease in the reception intensity of the broadcast wave by applying the present invention to a mobile terminal device such as a mobile phone terminal or a PDA, for example. Sub-contents related to can be played and provided to viewers.

It is a block diagram which shows the structural example of the system containing the portable terminal device of embodiment. It is a flowchart which shows the operation example (1) of the principal part in the portable terminal device shown in FIG. It is a flowchart which shows the operation example (2) of the principal part in the portable terminal device shown in FIG. It is a flowchart which shows the operation example (3) of the principal part in the portable terminal device shown in FIG. It is a flowchart which shows the operation example (4) of the principal part in the portable terminal device shown in FIG. It is a front view which shows the example of a display of the screen on the portable terminal device shown in FIG. It is a schematic diagram which shows the specific example of program supplement information. It is a schematic diagram which shows the example of an actual structure of program complementation information. It is a schematic diagram which shows the basic composition of TS packet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mobile terminal device 11 Broadcast receiving antenna 12 Broadcast wave receiving part 13 Wireless level detection part 14 Program information acquisition management part 15 Program content presentation control part 20 Broadcast station 21, 22 Program database 30 Broadcast wave transmission equipment 40 Distribution server 41, 42, 43 Server 45 Program Information Redistribution Server Management Unit 50 Display Screen 51, 52, 53, 54, 55 Display Area 56 Television Program Reception Display Unit 57 Reception Status Display Unit

Claims (5)

Connected to a broadcast receiving unit that receives a predetermined broadcast wave including digital content such as a TV program, a content reproduction unit that reproduces information of the received digital content, and an arbitrary server arranged on a predetermined communication network A portable terminal device comprising a digital communication unit for communication,
A reception state measuring means for measuring a reception state of a broadcast wave received by the broadcast receiving unit;
Server management means for managing at least the location of a specific server associated with a broadcast wave to be received by the broadcast receiving unit;
Based on the measurement result of the reception state measurement unit, when a predetermined deterioration of the reception state is detected, a communication line is connected to a specific server using the management information of the server management unit, and the digital signal is transmitted from the server. A portable terminal device comprising: content reproduction control means for acquiring sub-digital content related to content and reproducing the sub-digital content by the content reproduction unit instead of the digital content. The mobile terminal device according to claim 1,
The content reproduction control unit compares the measurement result of the reception state measurement unit with a first threshold value and a second threshold value that are different from each other in order to detect the degree of deterioration of the reception state. Starts to acquire sub-digital contents from the corresponding server when it is detected that the reception status has deteriorated, and starts reproduction output of the acquired sub-digital contents when it is detected that the reception state has deteriorated below the second threshold. A portable terminal device. In the portable terminal device according to claim 1 or 2,
The server management means extracts and stores server location information indicating the location of a specific server from information included in the broadcast wave received by the broadcast receiving unit,
The mobile terminal device, wherein the content reproduction control means acquires a sub-digital content by connecting a communication line with a specific server according to server location information held by the server management means. The mobile terminal device according to claim 1,
When there are a plurality of sets of contents having at least one of different data types and data sizes as the corresponding sub-digital contents, the content reproduction control unit preferentially selects some contents from the plurality of sets of contents. The mobile terminal device, wherein a part of the selected content is acquired from a specific server and reproduced by the content reproduction unit. The mobile terminal device according to claim 4,
The content reproduction control means extracts designation information indicating the priority of the sub digital content or the type of the digital content from information included in the broadcast wave received by the broadcast receiving unit, and according to the content of the extracted designation information A portable terminal device characterized in that a part of content is preferentially selected from a plurality of sets of contents, and the selected part of the content is acquired from a specific server and reproduced by the content reproduction unit.

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