JP2007096508A - Digital broadcasting receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable broadcast for fixed receivers and that for mobile units to be selected according to reception quality by simple configuration and processing. <P>SOLUTION: When the reception quality deteriorates to less than a first threshold while 12-segment broadcast is being selected and reproduced, the reception quality of 1-segment broadcast maintains at least a second threshold, and a message that a change to the 1-segment broadcast can be made is displayed on condition that simulcast is performed. When a viewer performs change operation within fixed time, the 12-segment broadcast is changed to the 1-segment one. When determining whether the simulcast is being performed; the start time of a program, a program length, and a program name are extracted from the 12-segment program information and 1-segment one, and it is determined that the simulcast is being performed when all of those coincide. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiver used in, for example, a terrestrial digital broadcast system that provides a fixed broadcast service using 12 segments and a mobile broadcast service using one segment.

  As for terrestrial digital broadcasting, a fixed broadcasting service using 12 segments is started in December 2003 in three major metropolitan areas, and a mobile broadcasting service using one segment is started in March 2006. By using 12 segments, the fixed-use broadcasting service can broadcast a large amount of information data compared to analog broadcasting, and thus has an advantage of being able to broadcast various information such as multi-angle with high quality. On the other hand, the broadcast service for mobile units has an advantage that it can be received even in an inferior wireless environment because it employs a method with higher error tolerance than the broadcast service for fixed use.

Recently, it has been proposed to mount a terrestrial digital broadcast receiver on a vehicle such as a bus or a private car. In such an in-vehicle use, a receiver installation space can be secured and an in-vehicle power source can be used, so that a fixed broadcasting service can be received. However, in in-vehicle applications, it is difficult to always perform stable reception due to the deterioration of the wireless environment during movement. Therefore, in addition to the reception function for fixed broadcasting in the receiver, it has a reception function for broadcasting for mobile objects, and switching reception between fixed broadcasting and mobile broadcasting according to changes in the wireless environment, Conventionally proposed (see, for example, Patent Document 1 or Patent Document 2).
Japanese Patent No. 3481172 JP 2004-166173 A

  When switching between the fixed broadcast and the mobile broadcast, the fixed broadcast and the mobile broadcast are premised on the so-called simultaneous broadcast in which the same program is broadcast simultaneously. However, in the conventional switching method, for example, the video or audio received by the fixed broadcast is compared with the video or audio received by the mobile broadcast, and if both match, it is determined that the simulcast is being performed. To switch. For this reason, it is necessary to perform arithmetic processing for decoding the reception packet of the fixed-use broadcast and the reception packet of the mobile-use broadcast and reproducing the video or audio, and obtaining the correlation of the reproduced video or audio, and a circuit configuration therefor In addition, there is a problem that the processing is complicated and large.

  The present invention has been made paying attention to the above circumstances, and its object is to make it possible to select the first broadcast and the second broadcast according to the reception quality, and to make this selection with a simple configuration and processing. It is to provide a digital broadcast receiver realized by the above.

  In order to achieve the above object, the first invention receives first and second broadcast signals, respectively, and media information contained in the received first broadcast signal and media information contained in the second broadcast signal. In the digital broadcast receiver having a function of selecting one of them, decoding and presenting it to the viewer, first and second determination means and message presentation means are newly provided.

  The first determination means detects the reception quality of the received first broadcast signal and the second broadcast signal, and one media signal is selected based on the detection result of the reception quality. In this state, it is determined whether or not the selection target can be switched from the selected media information to the non-selected media information. Further, the second determination means uses the first broadcast signal and the second broadcast signal for the same program based on the program information included in the first broadcast signal and the program information included in the second broadcast signal. It is determined whether or not is broadcast. Then, it is determined by the first determination means that switching from the currently selected media information to the non-selected media information is possible, and the second determination means determines that the first broadcast signal is the same as the second broadcast signal. When it is determined that the program is broadcast, a message indicating that the broadcast can be switched is presented to the viewer.

  Therefore, according to the first invention, for example, when the reception quality of the fixed broadcast signal deteriorates during the period in which the media information of the fixed broadcast signal as the first broadcast signal is presented, the second broadcast If reception quality of a broadcast signal for a mobile object as a signal is good and the same program as the fixed broadcast is broadcast in the mobile broadcast, a message to that effect is presented to the viewer. Similarly, in the state where the media information of the broadcast signal for mobiles is presented, the reception quality of the broadcast signal for fixed is good, and the same program as the mobile broadcast is being broadcast in the fixed broadcast. Then, a message to that effect is presented to the viewer. Therefore, the viewer can recognize from the message that there is another broadcast that can view the same program with better quality than the broadcast being viewed.

  Moreover, it is determined whether or not the same program is broadcast by comparing program information. For this reason, for example, compared with the case where it is determined whether or not the same program is broadcast by detecting the correlation between media information such as video and audio, the decoding process and the correlation calculation process between images or audio are not performed. The determination can be made with a simple configuration and processing.

  The first invention further includes manual switching control means, and when the viewer inputs a broadcast signal switching instruction within a predetermined time after the presentation of the message is started, the media information to be selected is stored in the media information to be selected. Control is performed to switch from selected media information to unselected media information. If comprised in this way, the viewer can switch broadcast by own manual operation.

  On the other hand, the second invention includes an automatic switching control means, wherein the first determination means determines that switching from the selected media information to the non-selected media information is possible, and the second determination means determines the first. When it is determined that the same program is broadcast by the first broadcast signal and the second broadcast signal, control is performed so that the media information to be selected is switched from the currently selected media information to the unselected media information. It is a thing.

  Therefore, according to the second invention, for example, when the reception quality of the fixed broadcast signal deteriorates during the period when the media information of the fixed broadcast signal is presented, the reception quality of the mobile broadcast signal is good, If the same program as the fixed broadcast is broadcast in the mobile broadcast, the media information of the selected broadcast is automatically switched to the media information of the non-selected broadcast. Similarly, in the state in which the media information of the broadcast signal for mobiles is being presented, the reception quality of the fixed broadcast signal is good, and the same program as the mobile broadcast is broadcast in the fixed broadcast. Even when the selected broadcast media information is selected, the media information of the selected broadcast is automatically switched to the media information of the non-selected broadcast. For this reason, the viewer can always watch a broadcast having a good reception quality among the fixed broadcast and the mobile broadcast without performing the switching operation by himself / herself.

  In addition, as in the first aspect of the invention, whether or not the same program is being broadcast is determined by comparing program information. For this reason, for example, decoding processing or correlation calculation processing between images or sounds is required compared with the case where it is determined whether or not the same program is broadcast by detecting correlation between media information such as video and audio. The determination can be made with a simple configuration and processing.

In particular, in the second determination means for determining the presence / absence of broadcast of the same program, the program name and program start time are determined from the program information included in the received fixed broadcast signal and the program information included in the mobile broadcast signal. And information representing the program length are extracted. Then, the information indicating the extracted program name, program start time and program length is compared to determine the degree of coincidence. When the obtained degree of coincidence satisfies a predetermined condition, The media information included in the broadcast signal and the media information included in the mobile broadcast signal may be determined to represent the same program.
With this configuration, since the presence / absence of broadcasting of the same program is determined based on three specific elements such as the program name, program start time, and program length, the presence / absence of broadcasting of the same program is always accurately determined. be able to.

  In short, according to the present invention, it is possible to select a first broadcast and a second broadcast having different error tolerances according to reception quality, and to provide a digital broadcast receiver capable of realizing this selection with a simple configuration and processing. be able to.

  FIG. 1 is a schematic configuration diagram showing an embodiment of a digital broadcast receiver according to the present invention. The digital broadcast receiver according to this embodiment includes an antenna 1, a tuner 2, a TS (Transport Stream) filtering unit 3, a buffering unit 4, a changeover switch unit 5, a media decoding unit 6, and a user interface unit 7. And a control unit 8.

The tuner 2 includes a radio unit 21 and a TS playback unit 22. The radio unit 21 frequency-converts the digital broadcast signal received by the antenna 1 to an intermediate frequency or a baseband frequency, demodulates the digital broadcast signal in segments, and inputs the demodulated reception data of each segment to the TS decoding unit 22. The TS reproducing unit 22 decodes the input received data of each segment, and further reproduces the TS packet by performing error detection and error correction decoding. Then, one series of TS information is generated by multiplexing the TS packets of each reproduced segment, and this TS information is supplied to the TS filtering unit 3. Note that the radio unit 21 receives the received signal strength of the broadcast signal. And the TS reproduction unit 22 detects a bit error rate (BER) based on the results of error detection and error correction decoding. The control unit 8 is notified.

  The TS filtering unit 3 separates each TS packet from one series of TS information output from the TS reproduction unit 22, and based on the separated TS packet, four types of PES (Packetized Elementaly Stream) packets and two types Play the section. The PES packet and section to be reproduced are composed of a 12 segment video packet, a 12 segment audio packet, a 1 segment video packet, a 1 segment audio packet, a 12 segment program information packet, and a 1 segment program information packet. When reproducing the PES packet, the TS filtering unit 3 detects an error occurrence state of each TS packet and notifies the control unit 8 of the detection result.

  The buffering unit 4 includes buffers 41 to 46 corresponding to the six types of PES packets. Then, each PES packet reproduced by the TS filtering unit 3 is temporarily stored in the buffers 41 to 46.

  The changeover switch unit 5 performs a switching operation under the control of the control unit 8 and selects a 12-segment video packet and an audio packet stored in the buffers 41 to 44 and a 1-segment video packet and an audio packet. Are selected and input to the media decoding unit 6.

  The media decoding unit 6 includes a plurality of types of decoders, and the video packets and audio packets fetched from the buffers 41 to 44 via the changeover switch unit 5 are decoded by the decoders corresponding to the encoding methods, respectively. Play data and audio data. As a decoder for video packets, for example, a decoder corresponding to MPEG-2 (Moving Picture Experts Group-2) or H.264 is used, and as a decoder for audio packets, for example, a decoder corresponding to AAC (Advanced Audio Coding). Is used.

  The user interface unit 7 includes a liquid crystal (LCD) display, a speaker, and a key input unit. The LCD display is used to display the video decoded and reproduced by the media decoding unit 6 and various control information such as a reception channel number and a message output from the control unit 8. The speaker is used to output the sound decoded and reproduced by the media decoding unit 6 and the alarm sound output from the control unit 8. The key input unit includes a reception channel selection key, a 12-segment broadcast and 1-segment broadcast selection key, a high-quality and low-quality selection key, and the like.

The control unit 8 includes a microcomputer, and includes a reception quality determination unit 81, a simulcast determination unit 82, and a segment selection control unit 83 as control functions according to the present invention.
The reception quality determination unit 81 is for fixed use based on the received electric field strength and BER detected by the radio unit 21 and the TS reproduction unit 22, respectively, and the TS packet error detection result detected by the TS filtering unit 3. The reception quality of the broadcast and the broadcast for mobiles is determined.

  The simulcast determination unit 82 fetches 12-segment program information and 1-segment program information from the buffers 45 and 46, respectively, and extracts information representing the program name, the broadcast start time and the broadcast time of each program information. To do. Then, the extracted program name of the 12-segment broadcast (first broadcast for fixed use), the broadcast start time and broadcast time of the program, the program name of the one-segment broadcast (second broadcast for mobile), and the program name The broadcast start time and the broadcast time are collated, and based on the collation result, it is determined whether or not the same program is broadcast in the same time zone in the 12 segment broadcast and the 1 segment broadcast, that is, whether or not the simulcast is being performed. To do.

  The segment selection control unit 83, based on the reception quality detection result by the reception quality determination unit 81, when a fixed broadcast is selected, the selected fixed broadcast is a non-selected mobile broadcast It is determined whether or not it is possible to switch to broadcast, and if the mobile broadcast is selected, it is determined whether or not the selected mobile broadcast can be switched to a non-selected fixed broadcast. As a result of the determination, it is determined that the currently selected broadcast can be switched to the non-selected broadcast, and the simultaneous broadcast determination unit 82 determines that the 12-segment broadcast and the 1-segment broadcast are being performed simultaneously. If a message is displayed, a message to that effect is superimposed on the video and displayed on the LCD display.

  The segment selection control unit 83 controls the changeover switch unit 5 to input to the media decoding unit 6 when a broadcast switching operation is performed by the key input unit within a predetermined time from the display start time of the message. Switching between a broadcast PES packet and a one-segment broadcast PES packet.

Next, the operation of the digital broadcast receiver configured as described above will be described.
The 12-segment and 1-segment digital broadcast signals received by the antenna 1 are first frequency-converted to an intermediate frequency or baseband frequency by the radio unit 21 in the tuner 2 and then demodulated in segment units. Subsequently, the demodulated received data of each segment is decoded by the TS decoding unit 22 and further subjected to error detection and error correction decoding to reproduce a TS packet. The reproduced TS packets of each segment are multiplexed to form one series of TS information, which is input to the TS filtering unit 3.

The TS filtering unit 3 performs TS packet filtering processing as follows. FIG. 3 is a flowchart showing the processing procedure.
That is, the tuner 2 outputs TS information that is multiplexed into one series as shown in FIG. The TS filtering unit 3 first separates the output TS information into TS packets. Next, as shown in FIG. 3, the content of the header is analyzed for each of the separated TS packets in step 3a, and the type of the TS packet is determined in steps 3b to 3g. Then, according to the determination result, in steps 3h to 3m, 12-segment video packet processing, 1-segment video packet processing, 12-segment audio packet processing, 1-segment audio packet processing, 12-segment program information packet processing, and 1-segment program Perform information packet processing. In these packet processes, a process of reproducing a PES packet based on the separated TS packet is performed. The PES packet reproduced by the packet processing is temporarily stored in the buffers 41 to 46 of the buffering unit 4.

  In the media decoding unit 6, a video packet and an audio packet are fetched from the buffers 41 to 44 via the changeover switch unit 5, and the video packet and the audio packet are each decoded by a decoder corresponding to the encoding method. . Then, the video data reproduced by this decoding process is supplied to the user interface unit 7, where it is displayed on the LCD display. The audio data reproduced by the decoding process is output from the speaker of the user interface unit 7 as a loud voice.

  Now, in this state, the control unit 8 performs broadcast selection control as follows. FIG. 4 is a flowchart showing the control procedure and control contents. That is, the control unit 8 first acquires the detection value and the BER of the received electric field strength from the radio unit 21 and the TS reproduction unit 22 of the tuner 2 in step 4a. At the same time, information about the reception quality of the TS packet is acquired from the TS filtering unit 3 in step 4b.

  Next, in step 4c, the control unit 8 determines whether the broadcast service currently selected by the changeover switch unit 5 is a fixed broadcast service or a rotating body broadcast service. As a result of this determination, if a fixed broadcasting service is currently selected, the control unit 8 proceeds to step 4d and determines whether or not the reception quality of the selected 12-segment broadcast is equal to or higher than the first threshold value. Determine. In this determination, a reception quality value of 12-segment broadcasting is obtained based on the received reception field strength detection value, BER and TS packet reception quality, and the reception quality value is set to the minimum guaranteed quality value. This is done by comparing with a threshold value of 1. As a result of the determination, if the reception quality of the selected 12-segment broadcast is equal to or higher than the first threshold value, the process returns to step 4a.

  In contrast, it is assumed that the reception quality of the selected 12-segment broadcast does not satisfy the first threshold value. In this case, the control unit 8 proceeds to step 4e, where it is determined whether or not the reception quality of the unselected one-segment broadcast is equal to or higher than the second threshold value. The second threshold value is set lower than the first threshold value. As a result of this comparison, if the reception quality of the one-segment broadcast is equal to or higher than the second threshold value, the control unit 8 proceeds to step 4f and determines whether or not the simulcast is being performed here as follows. . FIG. 5 is a flowchart showing the determination procedure.

  That is, the control unit 8 first acquires 12-segment program information and 1-segment program information from the buffers 45 and 46 of the buffering unit 4 in step 5a, respectively, and first determines the program start time from each of the acquired program information. Extract. This program start time is described as “start time” in the transmission operation rule as indicated by E3 in FIG. 7, for example, both 12 segment program information and 1 segment program information. The control unit 8 compares the extracted “start times” in step 5b. If they are equal, the control unit 8 proceeds to step 5c.

  In step 5c, the program length is extracted from each program information. This program length is described as “duration” in the transmission operation rule, for example, as indicated by E4 in FIG. The control unit 8 compares the extracted “durations” with each other in step 5c. If they are equal, the control unit 8 proceeds to step 5d.

  In step 5d, program names are extracted from the program information. This program name is described as “event name char” in the transmission operation rule, for example, as indicated by E1 in FIG. Note that “event id” in the transmission operation rule shown in FIG. 7 may be extracted instead of the program name. The control unit 8 compares the extracted “event name char” with each other in step 5d, and determines that simulcasting is being performed if they match. On the other hand, if any one of “start time”, “duration”, and “event name char” does not match in step 5b, step 5c, and step 5d, it is determined that a simulcast wave is not being performed. The

  That is, in the determination process for the presence / absence of simulcast, it is determined that simulcast is being performed when “start time”, “duration”, and “event name char” all match. However, since one-segment program information originally has a small amount of information that can be transmitted, a part of the program name may be omitted. Therefore, in the comparison process of “event name char”, it is determined that “event name char” matches by partial match without obtaining a complete match.

  For example, the “start time” of a 12-segment broadcast program is 19:00, “duration” is 0:30, and “event name char” is “surprise peach tree-the era of Oedo has started” On the other hand, it is assumed that “start time” of a 1-segment broadcast program is 19:00, “duration” is 0:30, and “event name char” is “surprise peach tree”. In this case, “start time” and “duration” match, but “event name char” does not match completely. However, in this case, the main title of “event name char” matches, so even if the subtitles do not match, it is determined that “event name char” matches, and therefore simulcast is being performed. .

  If it is determined that simulcasting is being performed, the control unit 8 proceeds from step 4g to step 4h, where a message “same program broadcast for mobile unit” is generated, and this message is superimposed on the video. Is displayed on the LCD display. An example of the display result is shown in FIG.

  When the display of the message is started, the control unit 8 monitors the switching operation in step 4j while monitoring the elapse of a predetermined time in step 4i. In this state, for example, when the viewer presses the 1 segment / 12 segment switching key KEY1 shown in FIG. 12, the process proceeds to step 4k, where the changeover switch unit 5 is controlled to switch from 12 segment broadcasting to 1 segment broadcasting. Switch. Therefore, thereafter, the user interface unit 7 displays and outputs video and audio of one-segment broadcasting. When a certain time has elapsed from the message display time without pressing the 1 segment / 12 segment switching key KEY1, the display of the message ends.

  If the reception quality of the 12-segment broadcast is maintained at or above the first threshold value, the selective reproduction of the 12-segment broadcast is continued as it is, and the reception quality of the 12-segment broadcast is less than the first threshold value. If the reception quality of the 1-segment broadcast does not satisfy the second threshold value or the simulcast is not being performed even if it has deteriorated, the switch to the 1-segment broadcast is given up and the 12-segment broadcast is selectively reproduced. Continue.

  On the other hand, when switching to the one-segment broadcast, the control unit 8 monitors whether or not the reception quality of the 12-segment broadcast has been restored to the first threshold value or higher in step 4m. When the reception quality of the 12-segment broadcast is restored to the first threshold value or higher, the control unit 8 determines whether or not the simulcast is being performed in step 4n. The procedure and contents of this determination are as described in FIG.

  If the result of the determination is that simulcasting is being carried out, the control unit 8 proceeds from step 4o to step 4p, where a message “Broadcasting the same program for fixed use” is generated, and this message is displayed as video. Is displayed on the LCD display. FIG. 11 shows an example of the display result.

  When the display of the message is started, the control unit 8 monitors the switching operation in step 4r while monitoring the elapse of a fixed time in step 4q. In this state, when the viewer presses the 1-segment / 12-segment switching key KEY1 shown in FIG. 12, for example, the process proceeds to step 4s, where the change-over switch unit 5 is controlled. Switch to. Therefore, thereafter, the user interface unit 7 displays and outputs video and audio of 12-segment broadcasting. When a certain time has elapsed from the message display time without pressing the 1 segment / 12 segment switching key KEY1, the display of the message ends.

  If the reception quality of the 12-segment broadcast does not recover to the first threshold or higher, or if the simulcast is not performed after the recovery, give up switching to the 12-segment broadcast and Continues selective playback.

  As described above, in this embodiment, when the reception quality of the 12-segment broadcast is lower than the first threshold value when the 12-segment broadcast is being selectively reproduced, the reception quality of the 1-segment broadcast is the second signal. A message is displayed indicating that switching to one-segment broadcasting is possible on condition that the threshold value is maintained and simulcasting is being performed. When the viewer performs a switching operation within a certain time, the 12 segment broadcast is switched to the 1 segment broadcast. Therefore, for example, even when the wireless environment deteriorates due to the movement of the vehicle, the viewer can continue to watch the same program by switching to the broadcast for one segment of the moving body.

  Moreover, when determining whether or not simultaneous broadcasting is being performed, “start time”, “duration”, and “event name char” are extracted from the 12-segment program information and the 1-segment program information, respectively. If they match, it is determined that simulcast is being performed. For this reason, accurate determination can always be performed.

  Considering the fact that part of the program name may be omitted because 1-segment program information originally has a small amount of information that can be transmitted, the "event name char" comparison process does not require an exact match. Therefore, it is determined that “event name char” matches by partial match. For this reason, it is possible to make an appropriate determination according to the actual situation.

  The present invention is not limited to the above embodiment. For example, in the embodiment, when it is determined that switching from 12-segment broadcasting to 1-segment broadcasting or switching from 1-segment broadcasting to 12-segment broadcasting is possible, a message to that effect is displayed. Is switched when the switch key KEY1 is pressed. That is, the broadcast is switched by the viewer's manual operation. However, the present invention is not limited to this, and the broadcast may be automatically switched when it is determined that the switching is possible. In this way, the viewer can always watch a broadcast with a good reception quality among a fixed segment broadcast by 12 segments and a mobile broadcast by 1 segment without performing a switching operation by himself / herself.

  Further, the viewer may be able to select and set the manual switching mode and the automatic switching mode in advance. This can be realized by, for example, displaying a switching mode selection setting screen as shown in FIG. 8 on the LCD display, and selecting and setting a desired menu on this screen by operating the cursor key and the decision key.

  Furthermore, when determining simulcast, the viewer may be able to select and set determination conditions in advance. This is realized, for example, by displaying a simulcast broadcast judgment condition setting screen as shown in FIG. 9 on the LCD display, and the viewer selecting and setting desired conditions by operating the cursor key and the decision key on this screen. it can.

  Furthermore, in the above-described embodiment, priority is given to 12-segment fixed broadcasting, and when reception quality of the 12-segment fixed broadcast deteriorates, switching to 1-segment mobile broadcasting is performed. However, on the contrary, broadcasting for one-segment mobiles may be given priority, and when the reception quality of the one-segment mobile-oriented broadcasting deteriorates, switching to fixed broadcasting for 12 segments may be performed.

  Furthermore, in the above-described embodiment, the case where one threshold value is set as a threshold value for determining the reception quality of 12-segment broadcasting has been described. However, the present invention is not limited to this, and the first level and the second level higher than the first level are set as threshold values. When the reception quality drops below the first level, it is possible to switch to 1-segment broadcasting. On the other hand, when the reception quality is restored to the second level or higher, switching from 1-segment broadcasting to 12-segment broadcasting is possible. It may be configured to be possible. In this way, it is possible to provide the switching with hysteresis characteristics, thereby improving the stability of the broadcast receiving operation by preventing the switching operation from being performed frequently.

  Furthermore, when a function for displaying a list of program lists is provided, information indicating the presence / absence of simulcast may be displayed on the display screen. FIG. 13 shows an example of the display result. In this way, the viewer can select a program to view after confirming a program on which simulcast is being performed in advance.

  Furthermore, in the above-described embodiment, the case where the fixed broadcast as the first broadcast and the mobile broadcast as the second broadcast are switched according to the reception quality has been described as an example. However, the present invention is not limited to this, for example, when previously acquired program information is stored (first program information) and the first broadcast cannot be received as a result of moving the area by a moving body or the like, that is, the first When the broadcast reception quality becomes the lowest, the program information (second program information) acquired at the destination is compared with the stored first program information to determine whether or not the programs are the same. And if this determination result is the same program, the newly received second broadcast may be selectively received. In this way, it becomes possible to search for and view the same program from different broadcasting stations, and thus, for example, a program reserved by the viewing reservation function can be continuously viewed even in a different destination area. Become.

In addition, the configuration of the digital broadcast receiver, the broadcast switching control procedure and control content, the reception quality determination algorithm, the simulcast determination method, and the like can be variously modified without departing from the spirit of the present invention.
In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

1 is a schematic configuration diagram showing an embodiment of a digital broadcast receiver according to the present invention. The figure which shows an example of a structure of TS information input into the TS filtering part from the tuner in the digital broadcast receiver shown in FIG. The flowchart which shows the process sequence of the TS filtering part in the digital broadcast receiver shown in FIG. The flowchart which shows the broadcast selection control procedure and control content of the control unit in the digital broadcast receiver shown in FIG. The flowchart which shows the simulcast determination process procedure in the broadcast selection control procedure shown in FIG. The figure which shows an example of a structure of the program information used for the determination process of simulcast. The figure which shows an example of a structure of the program information used for the determination process of simulcast. The figure which shows an example of a switching mode selection setting screen. The figure which shows an example of the judgment condition setting screen of simulcast. The figure which shows the example of the message which shows that the switch to 1 segment broadcast displayed in the state which is selecting and reproducing 12 segment broadcast is possible. The figure which shows the example of the message which shows that the switch to 12 segment broadcast displayed in the state which is selectively reproducing 1 segment broadcast is possible. The figure which shows an example of a 1 segment / 12 segment switching key. The figure which shows the example of a display in the case of displaying the information which shows the presence or absence of simulcast on the list display screen of a program list.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... Tuner, 21 ... Radio | wireless part, 22 ... TS reproduction part, 3 ... TS filtering part, 4 ... Buffering part, 41-46 ... Buffer, 5 ... Changeover switch part, 6 ... Media decoding unit, 7 User interface unit, 8 Control unit, 81 Reception quality determination unit, 82 Simul broadcast determination unit, 83 Segment selection control unit

Claims (4)

Means for receiving a first broadcast signal including program information indicating the attributes of the program and media information indicating the contents of the program;
Means for receiving a second broadcast signal including program information indicating the attributes of the program and media information indicating the contents of the program;
Selecting means for selecting one of media information included in the received first broadcast signal and media information included in the received second broadcast signal;
Means for decoding and presenting the selected media information to a viewer;
Means for detecting the reception quality of each of the received first broadcast signal and the received second broadcast signal;
Whether or not it is possible to switch the selection target from the currently selected media information to the non-selected media information based on the reception quality detection result when one of the media signals is selected by the selection means First determination means for determining
Based on the program information included in the received first broadcast signal and the program information included in the received second broadcast signal, the same program is obtained by the first broadcast signal and the second broadcast signal. Second judging means for judging whether or not is broadcast,
The first determination means determines that switching from the selected media information to the non-selected media information is possible, and the second determination means determines the same program based on the first broadcast signal and the second broadcast signal. And a message presenting means for presenting a message to the viewer that the broadcast can be switched when it is determined that the broadcast is switched. An input means for the viewer to input a broadcast signal switching instruction;
When a switching instruction is input by the input unit within a certain time after the message presentation unit starts presenting the message, the media information to be selected is changed from the currently selected media information to the non-selected media information. 2. The digital broadcast receiver according to claim 1, further comprising control means for controlling the selection means so as to be switched. Means for receiving a first broadcast signal including program information indicating the attributes of the program and media information indicating the contents of the program;
Means for receiving a second broadcast signal including program information indicating the attributes of the program and media information indicating the contents of the program;
Selecting means for selecting one of media information included in the received first broadcast signal and media information included in the received second broadcast signal;
Means for decoding and presenting the selected media information to a viewer;
Means for detecting the reception quality of each of the received first broadcast signal and the received second broadcast signal;
Whether or not it is possible to switch the selection target from the currently selected media information to the non-selected media information based on the reception quality detection result when one of the media signals is selected by the selection means First determination means for determining
Based on the program information included in the received first broadcast signal and the program information included in the received second broadcast signal, the same program is obtained by the first broadcast signal and the second broadcast signal. Second judging means for judging whether or not is broadcast,
The first determination means determines that switching from the selected media information to the non-selected media information is possible, and the second determination means determines the same program based on the first broadcast signal and the second broadcast signal. Control means for controlling the selection means so as to switch the selected media information from the currently selected media information to the non-selected media information when it is determined that the media information is broadcast. Digital broadcast receiver. The second determination means includes
Means for extracting information representing a program name, a program start time, and a program length from program information included in the received first broadcast signal and program information included in the received second broadcast signal, respectively. When,
Means for comparing the extracted program name, program start time and program length information to determine the degree of coincidence;
Means for determining that the media information included in the first broadcast signal and the media information included in the second broadcast signal represent the same program when the degree of coincidence satisfies a predetermined condition; The digital broadcast receiver according to claim 1, further comprising:

Images