JP5226245B2 - Digital broadcast receiver - Google Patents

Description

  The present invention relates to a digital broadcast receiving apparatus of a digital broadcast system such as digital television broadcast and digital audio broadcast.

  Terrestrial digital television broadcasting operated in Japan is called the ISDB-T (Integrated Services Digital Broadcasting for Terrestrial) system and employs an OFDM (Orthogonal Frequency Division Multiplexing) modulation system. This ISDB-T system divides the transmission band of one channel into 13 segments, and one of the segments (central segment number 0) is transferred to a mobile terminal such as a mobile phone or a PDA (Personal Digital Assistant). For digital terrestrial broadcasting, so-called 1-segment broadcasting.

  In recent years, portable terminals equipped with a function for viewing digital broadcasting as described above have become widespread. In digital broadcasting, broadcasting stations, channels, or programs broadcast by districts often change. When using the digital broadcast receiving function of a mobile terminal, due to its nature, the user often carries the mobile terminal and moves, and there is often an opportunity to cross the broadcasting district. Also, users who commute to the city from the suburbs often have different broadcast areas at home and at work / school. When such a situation occurs, it indicates that the conventional mobile terminal cannot receive. Alternatively, channel scanning is started, and when an affiliated station is found, the channel is selected for the affiliated station and a reception operation is performed. Such a channel scan takes several seconds or more and makes the user feel stressed. Further, even if the scanning is successful and the affiliated station is received, there is a possibility that the same program is not broadcast. Thus, in order to shorten the time required for channel scanning, many conventional techniques for improving the tuning control method have been proposed (see, for example, Patent Document 1).

  Moreover, as a broadcasting apparatus adopting the above-mentioned ISDB-T system, recently, for example, digital broadcasting waves of a plurality of broadcasting stations are received, each one-segment broadcasting is extracted, and they are connected to connect the above broadcasting stations. There has been proposed a broadcasting apparatus that retransmits data on a predetermined channel different from the channel (see, for example, Patent Document 2). In addition to a 1-segment broadcast extracted from a digital broadcast wave of a broadcast station, a broadcast apparatus configured to connect unique content and transmit it through a predetermined channel has also been proposed.

JP 2003-325622 A JP 2006-109283 A

  Although the technique of the above-mentioned Patent Document 1 can reduce the channel scan time to some extent, it is indispensable to perform the channel scan processing, so it is difficult to reduce the time to the extent that the user feels no stress. In addition, as with the technique of Patent Document 1, since the technique is basically intended for a stationary digital broadcast receiving apparatus, the receiving apparatus has moved to change the reception state and the receiving broadcasting station. Can't respond to the situation. In addition, a gap filler or a spot-type broadcasting device may have a broadcasting unique to the device called a unique broadcasting. Just by scanning and finding affiliated stations as in the prior art, you do not notice the existence of your own broadcast. The user himself / herself has to take action to search for an original broadcast. Also, when displaying the program guide, it is difficult to display the original channel (original broadcast).

  Furthermore, as described in the above-mentioned Patent Document 2, when each segment of a predetermined channel is broadcasted by 1-segment broadcasting, it is conceivable that the service segment arrangement changes when the broadcasting area changes. In particular, in the case where broadcasting is performed by adding unique content to the above-described existing service, if the broadcasting region changes, the possibility that the unique content and its segment arrangement will change increases.

  For this reason, in order for the user to grasp the segment arrangement of the service in the channel and partially receive the desired 1-segment broadcast, the user accesses the broadcasting station website of the channel and acquires the segment arrangement information of the service. Or receiving notification via e-mail, or scanning the segment of the channel to grasp the segment arrangement of the service. Further, even if the arrangement of segments being broadcast can be grasped, there is a problem that it is impossible to grasp what service (program) is being broadcast in which segment.

  However, in order to obtain the service segment arrangement information from the website of the broadcasting station, it is necessary to access the website of the broadcasting station for each acquisition. The Further, when the segment arrangement information of the service is grasped by scanning the segments in the channel, there is a concern that it takes time to grasp the segment arrangement information of all the services.

  In addition to the above technique, it is also conceivable to broadcast (concatenate) only unique content on a predetermined channel. However, even in this case, in order to grasp the service segment arrangement in the channel, it is necessary to access the broadcasting station website of the channel or scan the channel segment in the same manner as described above. There will be similar problems.

  Also, in terrestrial digital audio broadcasting that adopts ISDB-Tsb (ISDB for Terrestrial Sound Broadcasting), it is conceivable to change the service segment arrangement or add original content depending on the broadcasting region. In these cases, the same problem occurs.

  In other words, the conventional digital broadcasting technology switches from receiving one broadcasting station to receiving another broadcasting station (such as a gap filler or another district broadcasting station) in order to diversify broadcasting equipment and frequency arrangements. It has been extremely difficult to perform smoothly and seamlessly.

  Accordingly, an object of the present invention made in view of such circumstances is to provide a digital broadcast receiving apparatus capable of smoothly and seamlessly switching the reception of digital broadcasts between various broadcast stations.

In order to solve the above-described problems, a digital broadcast receiving apparatus according to the present invention includes:
A digital broadcast receiver for a digital broadcast system that broadcasts the same service at a plurality of physical frequencies,
A storage unit that stores information indicating a plurality of physical frequencies that broadcast the same service in one region as a single channel list in association with the same channel number;
If the reception quality of the digital broadcast is deteriorated while receiving the digital broadcast in one area, it is based on another physical frequency associated with the channel number of the received digital broadcast in the channel list. A control unit for controlling to receive digital broadcasting;
It is characterized by comprising.

The digital broadcast receiving apparatus according to one embodiment of the present invention includes:
A digital broadcast receiver for a digital broadcast system that broadcasts the same service at a plurality of physical frequencies,
A storage unit that stores information indicating a plurality of physical frequencies that broadcast the same service in one region as a single channel list in association with the same channel number;
Each time a digital broadcast is received, a recording unit that records data indicating a physical frequency corresponding to the reception;
When receiving a digital broadcast in a region and then starting a new digital broadcast, the digital broadcast is received based on the physical frequency indicated in the data recorded in the recording unit. And when a predetermined reception quality is not obtained in the reception by the control, digital data is obtained based on another physical frequency associated with the channel number of the physical frequency indicated in the data in the channel list. A control unit that controls to receive a broadcast;
It is characterized by comprising.

  It is preferable that each of the physical frequencies is a physical channel. It is preferable that each of the physical frequencies is information indicating a physical channel and a segment.

In the digital broadcast receiver according to a further embodiment of the present invention,
The storage unit stores, for each region, a channel list in which the correspondence between channel number and information indicating physical frequency is different,
When the control unit cannot obtain a predetermined reception quality by digital broadcast reception control based on another physical frequency indicated in the information stored in the storage unit, from the channel list of the current region, Switch to a local channel list, and control to receive a digital broadcast broadcasting a similar service based on the switched channel list.
It is characterized by that.
Here, a similar service can be determined based on information of affiliated stations of broadcasting stations. The information on the affiliated station of the broadcasting station may be stored in advance in the storage unit, or may be obtained by receiving data broadcasting of digital broadcasting. Further, in the case of a device having a communication unit to the Internet or the like, it may be acquired by communication.

  In addition, based on information obtained by receiving a digital broadcast, the information indicating a plurality of physical frequencies broadcasting the same service stored in the storage unit is associated with the same channel number. Is preferably updated or created.

  As described above, the solution of the present invention has been described as an apparatus. However, the present invention can be realized as a method, a program, and a storage medium storing the program, which are substantially equivalent thereto, and the scope of the present invention. It should be understood that these are also included.

A control method of a digital broadcast receiving apparatus according to an embodiment of the present invention includes:
A control method for a digital broadcast receiving device of a digital broadcast system that broadcasts the same service at a plurality of physical frequencies,
The digital broadcast receiving device stores information indicating a plurality of physical frequencies that broadcast the same service in one region, in the storage unit as one channel list in association with the same channel number,
When the digital broadcast receiving apparatus receives a digital broadcast in one area, if the reception quality of the digital broadcast deteriorates, it is associated with the channel number of the received digital broadcast in the channel list. Receive digital broadcasts based on other physical frequencies.
In addition, the control method of the digital broadcast receiving apparatus according to the embodiment of the present invention includes:
A control method for a digital broadcast receiving device of a digital broadcast system that broadcasts the same service at a plurality of physical frequencies,
The digital broadcast receiving device stores information indicating a plurality of physical frequencies that broadcast the same service in one area, associating with the same channel number, and storing it as one channel list,
Each time the digital broadcast receiving apparatus receives a digital broadcast, it records data indicating a physical frequency corresponding to the reception,
When the digital broadcast receiving apparatus starts receiving a new digital broadcast after completing the reception of the digital broadcast in one area, it is based on the physical frequency indicated in the data recorded in the recording unit. When control is performed so as to receive digital broadcasts and predetermined reception quality is not obtained in reception by the control, another channel number corresponding to the channel number of the physical frequency indicated in the data is stored in the channel list. Receive digital broadcast based on physical frequency.

  According to the present invention, information indicating a plurality of physical frequencies that broadcast the same service is associated with the same channel number, and by using this, there is no need to perform channel scanning, and between various broadcasting stations. It is possible to smoothly and seamlessly switch the reception of digital broadcasts in this way, and the convenience for the user is greatly improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, terms will be explained. “Unique broadcasting (service) (unique program / independent program)” is a service (program) created outside an existing broadcasting station. For example, it is a service (program) that provides information on a limited area or facility such as a shopping street, an amusement park, or a museum.

  FIG. 1 is a configuration diagram of a broadcasting system including a receiving apparatus to which the present invention is applied and a broadcasting apparatus that provides broadcast waves to the receiving apparatus. As shown in the figure, this broadcasting system includes a receiving device 100 and broadcasting devices 200, 300, and 400. The broadcasting devices 200 and 400 are broadcasting devices of a general digital broadcasting system, and use one segment broadcasting, that is, digital broadcasting using a segment for partial reception that can be received by only one segment, and 12 segments. Digital broadcasting for terrestrial TV. In this digital broadcasting system, the broadcasting device 200 and the broadcasting device 300 are broadcasting the same service, but the physical frequency band used by the broadcasting device 200 and the physical frequency band used by the broadcasting device 300 are the same. Is different. That is, all or part of the service broadcast from the broadcast device 200 is broadcast from the broadcast device 300 using a physical frequency band different from the physical frequency band used by the broadcast device 200. The broadcast device 300 also broadcasts a service different from the service broadcast by the broadcast device 200, for example, an original broadcast (original program / independent program). The receiving device 100 according to the present invention can receive a digital broadcast broadcast from the broadcasting device 200 in a reception area covered by the broadcasting device 200. For example, when the receiving apparatus 100 enters an underground mall or the like, the digital broadcast from the broadcasting apparatus 200 becomes a weak electric field or out of service area, and it is difficult to continue receiving. On the contrary, it may occur that the digital broadcast from the broadcasting device 300 goes out to the ground from the underground shopping street, becomes a weak electric field or out of service area, and it is difficult to continue reception. In such a case, the receiving apparatus 100 seamlessly receives the digital broadcast received by the broadcast apparatus 200 and the digital broadcast received by the broadcast apparatus 300 based on a channel list, that is, a channel table (described in detail later). Switch to.

  Alternatively, for example, the receiving apparatus 100 may be far away from the broadcasting apparatus 200 and the digital broadcast becomes a weak electric field or out of service area, making it difficult to continue receiving, and entering the area covered by the broadcasting apparatus 400 may occur. Even in such a case, the receiving apparatus 100 performs reception of the digital broadcast of the broadcast apparatus 200 and reception of the digital broadcast of the broadcast apparatus 400 by a channel list for each region, that is, a channel table for each region (details later). To seamlessly switch through.

  FIG. 2 is a block diagram of the broadcasting device 300. As shown in the figure, the broadcasting apparatus 300 includes a number of receiving units corresponding to the number of channels input from the optical fiber, that is, a chA receiving unit 310A, a chB receiving unit 310B, and a chZ receiving unit 310Z. The broadcast device 300 further includes a multiplexing processing unit 320, a modulation unit 330, a transmission unit 340, and an antenna 350. The chA receiving unit 310A, the chB receiving unit 310B, and the chZ receiving unit 310Z include TS signal receiving units 312A, 312B, and 312Z, and service information extracting units 314A, 314B, and 314Z, respectively.

  In this embodiment, the chA receiving units 310A and 310B correspond to existing physical channel broadcasting stations. Here, for convenience, for example, the chA receiver 310A corresponds to the AAA television of the physical channel chA, and the chB receiver 310B corresponds to the BBB television of the physical channel chB. The TS signal receiving unit 312A of the chA receiving unit 310A receives the chA TS signal transmitted via the transmission means such as an optical fiber from the content storage device of the corresponding broadcasting station, and the service information extracting unit 314A receives the TS signal. The service information contained in is extracted. The chB receiving unit 310B also performs similar processing on the chB TS signal. Further, the chZ receiving unit 310Z corresponds to the original broadcast (service) of the broadcast device 300. The TS signal receiving unit 312Z of the chZ receiving unit 310Z receives a chZ TS signal transmitted from a corresponding content storage device or the like via a transmission means such as an optical fiber, and is included in the TS signal by the service information extracting unit 314Z. Extract service information. The service information extraction units 314A, 314B, and 314Z extract service information from the TS signals supplied from the TS signal reception units 310A, 310B, and 310Z, and supply the extracted service information to the multiplexing processing unit 320.

  The multiplexing processing unit 320 multiplexes the partial reception TS signals of each channel based on a segment arrangement set in advance. At this time, a control signal or the like is added so as to be adapted to the digital broadcast signal. Modulation section 330 converts the multiplexed signal into an OFDM signal and sends it to transmission section 340. Transmitter 340 amplifies the OFDM signal to a set value and outputs the amplified signal from antenna 350.

  FIG. 3 is a diagram illustrating a segment configuration of a channel transmitted by the broadcasting device 300. As shown in the upper part of the figure, the broadcast apparatus 300 that is a normal broadcast station uses the central segment number 0 for each physical channel for 1-segment broadcasting that is a segment for partial reception. The broadcast device 300 broadcasts each service of segment number 0 for partial reception in one physical channel. In addition, the broadcasting apparatus 300 can also arrange the unique program in an unused segment (eg, segment number 10 in FIG. 3) as a segment reception segment. A unique program is arranged in the segment number 0 in the center. Each service (channel) does not have to be completely connected without a gap so that the lower segment 7 in FIG. 3 is unused. Such a format is also referred to as a connected broadcast for convenience.

  FIG. 4 is a block diagram of a receiving apparatus according to an embodiment of the present invention. As shown in the figure, the receiving apparatus 100 includes a control unit 110, a broadcast receiving unit 120, a reception state detecting unit 130, a storage unit 140, an operation unit 150, a display unit 160, and an antenna ANT. The control unit 110 includes a broadcast viewing unit 112 and a reception control unit 114. The broadcast viewing unit 112 has a function of receiving a digital broadcast, and the reception control unit 114 has a function of controlling reception. The storage unit 140 includes a channel table storage unit 142 and a last channel storage unit 144. The last channel storage unit 144 has a function of storing the last received channel “last channel” at the time of the previous reception, and the channel table storage unit 142 is configured to reduce the reception quality of the channel table (channel list) and digital broadcasting. It has a function of storing a threshold value for detection. In the channel table, information necessary for channel selection is recorded. Specifically, a broadcast station of a broadcast transmitted by a broadcast station that broadcasts the same service as the parent station and the parent station, physical Information about frequency (for example, physical channel and segment) and logical channel (channel number) is included. This information can be created, acquired or updated by communication or channel scanning. In this embodiment, it is assumed that channel information of a parent station and a broadcasting apparatus (for example, broadcasting apparatus 300) that broadcasts the same service as the parent station is registered in the channel table in advance. In addition, the channel table exists for each broadcast area (for example, areas such as the Tokyo metropolitan area, the central area, and the Kansai area) as shown in FIGS. The reception state detection unit 130 has a function of controlling the reception state of the broadcast wave. The operation unit 150 has a function of inputting various operations such as channel selection by the user. The display unit 160 has a function of displaying a program guide and received broadcasts. In the receiving apparatus according to the present invention, by referring to the channel table, it is not necessary to perform channel scanning, and it is possible to seamlessly switch the broadcast station to be received. Also, since the broadcast station and broadcast contents (network ID and service ID) are the same, it is possible to directly associate the master station and information of a broadcasting device that broadcasts the same service as the master station, so one channel table The information of the master station and the broadcasting device can be put together on the network, and the mutual information can be referred to quickly. Further, when the broadcasting apparatus performs independent broadcasting, it is possible to notify the user that there is an independent broadcasting by storing the information of the original broadcasting in the channel table. Examples of the broadcasting device include a relay station facility, a spot broadcasting device, and a gap filler. Note that a gap filler is a facility for connecting radio waves to an area or place where radio waves are difficult to reach using an antenna or a leak cable. The control unit 110 detects reception quality of digital broadcasting in cooperation with other components.

  FIG. 5 is a diagram illustrating a first channel table. As shown in the figure, there are channel tables (channel lists) for each area. In this example, there are a metropolitan area channel table L1, a central channel table L2, and a Kansai channel table L3. Here, the physical frequency is defined by a set of physical channels and segments. For example, the broadcasting station MHK in the metropolitan area channel table L1 is a logical channel (channel number) 1, and the logical channel 1 includes a physical channel of a broadcasting apparatus in the metropolitan area (corresponding to the master station and the broadcasting apparatus 200). A set of 25 and segment number 0, and a set of physical channel 50 and segment number 3 of a broadcasting apparatus (corresponding to broadcasting apparatus 300) that broadcasts the same service as the Tokyo metropolitan area are associated with each other. The broadcast apparatus 300 in this example broadcasts the physical channel 50 by connecting a plurality of partially receivable segments. In this way, if information indicating a plurality of physical frequencies (a set of physical channels and segment numbers) transmitted from a plurality of broadcasting stations is associated with one logical channel, the broadcasting station and the frequency to be received change. However, the same logical channel number is displayed on the screen display.

  FIG. 6 is a diagram illustrating the second channel table. As shown in the figure, there are channel tables for each area. In this example, there are a Kanto channel table L4, a central channel table L5, and a Kansai channel table L6. Here, the physical frequency is defined by the frequency (physical channel) itself. For example, the broadcasting station MHK in the Kanto channel table L1 is a logical channel (channel number) 1, and this logical channel 1 has a frequency of 575 MHz of a Kanto broadcasting device (corresponding to the parent station and the broadcasting device 200), A frequency 713 MHz of a broadcasting device (corresponding to the broadcasting device 300) that broadcasts the same service as the station is associated with each other. The broadcast apparatus 300 in this example broadcasts a service (program) for each logical channel at a separate physical frequency (physical channel).

<Embodiment 1>
FIG. 7 shows a flow when a channel is switched from a channel received from a parent station (for example, broadcasting apparatus 200) to a channel of a broadcasting apparatus (for example, broadcasting apparatus 300) that broadcasts the same service as the parent station, or vice versa. It is a flowchart which shows. That is, here, it is assumed that the user has moved from an area where the broadcast apparatus 200 or the broadcast apparatus 300 can receive a digital broadcast to another area where the broadcast apparatus 300 or the broadcast apparatus 200 can receive a digital broadcast.

  As shown in the figure, digital broadcast channel A is received in step S11. Next, in step S12, it is continuously checked whether or not the reception quality (for example, reception sensitivity or reception image quality) is equal to or less than an arbitrary threshold value N. When the reception quality of channel A becomes smaller than an arbitrary threshold value N, the process proceeds to step S13, and the channel table stored in the channel table storage unit 112 is referred to. For example, if the channel A belongs to the broadcast station 200 (master station) according to the referenced channel table, the corresponding channel P of the broadcast station 300 is selected (step S14), and the channel P is displayed. (Step S16), and the process ends. Alternatively, according to the referenced channel table, for example, if channel A belongs to the broadcasting device 300, the corresponding channel P of the broadcasting device 200 (master station) is selected (step S14), and the channel P is selected. Display (step S16), and the process ends. If the selected channel cannot be received (step S15), the process proceeds to step S17, displaying “cannot be received” (message) indicating that the channel cannot be received, and the process ends. Here, the channels A and P may be a certain segment number accommodated in a certain physical channel or one physical channel.

<Embodiment 2>
FIG. 8 is a flowchart showing a flow when starting to watch digital broadcasting and receiving the last channel. As shown in the figure, in step 21, the broadcast viewing unit 112 starts receiving the last channel stored in the last channel storage unit 144. Next, in step S22, it continues to check whether or not the reception quality is an arbitrary threshold value N or less. If the reception quality becomes lower than an arbitrary threshold N at the start of channel A reception, the process proceeds to step S23, and the channel table is referred to. Then, in step S24, according to the channel table referred to, for example, if channel A belongs to the broadcasting device 200 (master station), the corresponding channel P of the broadcasting device 300 is selected, and the channel P Is received, channel P is displayed (step S26), and the process is terminated. Alternatively, for example, if the channel A belongs to the broadcasting device 300 according to the referenced channel table, the channel P of the corresponding broadcasting device 200 (master station) is selected (step S24), and the channel P is selected. If it can be received, channel P is displayed (step S26), and the process is terminated. If the selected channel cannot be received in step S25, the process proceeds to step S27, displaying “cannot be received” indicating that the channel cannot be received (message), and the process is terminated.

<Embodiment 3>
FIG. 9 is a flowchart showing the flow of switching the area of the channel table due to a weak electric field during digital broadcast viewing. Here, it is assumed that the user has moved in the broadcasting area. That is, in FIG. 1, a case is assumed in which the receiving device 100 gradually moves from the receiving area of the broadcasting device 200 to the receiving area of the broadcasting device 400. As shown in FIG. 9, in step S31, channel A of digital broadcasting is received. Thereafter, in step S32, it is continuously checked whether the reception quality is equal to or less than an arbitrary threshold value N. When the reception quality becomes lower than the arbitrary threshold value N during the channel A reception, the process proceeds to step S33, and the channel table is referred to. In step S34, for example, if channel A belongs to the broadcasting device 200 (master station), the corresponding channel P of the broadcasting device 300 can be selected and received according to the referenced channel table. If so, channel P is displayed (step S36), and the process is terminated. Alternatively, if the channel A is for the broadcasting device 300, the channel P of the corresponding broadcasting device 200 (master station) is selected according to the referenced channel table (step S34), and the channel A can be received. Channel P is displayed (step S36), and the process is terminated. If it is determined in step S35 that the selected channel cannot be received, the process proceeds to step S37, and the channel table is switched to one in a different region and referred to. Next, in step S38, a channel Q in a different area corresponding to channel A is found from the referenced channel table, the found channel Q is selected, and if it can be received, the channel Q is displayed (step S38). S40), the process ends. If it is determined in step S39 that the selected channel cannot be received, the process proceeds to step S41 to display “cannot be received” (message) indicating that the channel cannot be received, and the process ends.

<Embodiment 4>
FIG. 10 is a flowchart showing a flow for switching the region of the channel table. As shown in the figure, after starting the reception of the digital broadcast, the broadcast viewing unit 112 starts receiving the last channel stored in the last channel storage unit 144 (step S51). Thereafter, in step S52, it is continuously checked whether the reception quality is equal to or less than an arbitrary threshold value N. When the reception quality of the channel A becomes smaller than the arbitrary threshold value N, the process proceeds to step S53, and the channel table is referred to. Then, according to the channel table referred to in step S53, for example, if channel A belongs to the broadcasting device 200 (master station), the corresponding channel P of the broadcasting device 300 is selected (step S54). If the channel can be received, the channel P is displayed (step S56), and the process ends. Alternatively, if channel A belongs to the broadcasting device 300, the corresponding channel P of the broadcasting device 200 (master station) is selected according to the referenced channel table (step S54), and the channel can be received. If YES, channel P is displayed (step S56), and the process ends. If it is determined in step S55 that the selected channel cannot be received, the process proceeds to step S57, and the channel table is switched to one in a different region and referred to. A channel Q in a different area corresponding to channel A is found from the channel table referenced in step S57, and the found channel Q is selected (step S58). If the channel is received, channel Q is displayed. (Step S60), and the process ends.
If the selected channel cannot be received in step S59, the process proceeds to step S61, displaying “cannot be received” (message) indicating that the channel cannot be received, and the process ends.

<Embodiment 5>
FIG. 11 is a flowchart illustrating a flow when displaying that there is a possibility that there is a unique broadcast when switching to the broadcast from the broadcast device 300. That is, in FIG. 1, a case is assumed where the receiving device 100 gradually moves from the receiving area of the broadcasting device 200 to the receiving area of the broadcasting device 300. As shown in FIG. 11, in step S71, reception from the broadcasting device 300 is started. Next, in step S72, a message (message) indicating that there is a possibility that the original broadcast can be viewed on the display unit 160 is displayed. FIG. 12 shows a display example for notifying that there is a possibility that the original broadcast can be viewed. As shown in Fig. 12, the text "You may be able to watch your own broadcast" and the dinosaur chart on the screen are examples, and you can see the pictures, pictures, pictures, icons, etc. that represent the subject of your own broadcast. Is possible.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each unit, each means, each step, etc. can be rearranged so as not to be logically contradictory, and a plurality of means, steps, etc. can be combined or divided into one. It is. In addition, the broadcasting device 300 is not limited to the linked broadcasting of the embodiment, and the service may be broadcast (transmitted) by an arbitrary segment of a separate physical channel.

1 is a configuration diagram of a broadcasting system including a receiving device to which the present invention is applied and a broadcasting device that provides broadcast waves to the receiving device. 2 is a block diagram of a broadcasting device 300. FIG. It is a figure which shows the segment structure of the channel which the broadcast apparatus 300 transmits. It is a block diagram of the receiver by one embodiment of this invention. It is a figure which shows a 1st channel table. It is a figure which shows a 2nd channel table. It is a flowchart which shows the flow at the time of switching a channel. It is a flowchart which shows the flow at the time of starting viewing of digital broadcasting and receiving a last channel. It is a flowchart which shows the flow which becomes a weak electric field at the time of digital broadcast viewing, and switches the area of a channel table. It is a flowchart which shows the flow which switches the area of a channel table. It is a flowchart which shows the flow in the case of displaying that there exists a possibility that there exists an original broadcast when switching to the broadcast from the broadcast apparatus 300. FIG. It is a figure which shows the example of a display which notifies that there exists possibility that an original broadcast can be viewed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Receiver 110 Control part 112 Broadcast viewing part 114 Reception control part 120 Broadcast reception part 130 Reception state detection part 140 Storage part 142 Channel table storage part 144 Last channel storage part 150 Operation part 160 Display part ANT Antenna L1-L6 Channel table 200 , 300, 400 Broadcasting device 310A, 310B, 310Z chA signal receiving unit, chB signal receiving unit, chZ signal receiving unit 312A, 312B, 312Z TS signal receiving unit 314A, 314B, 314Z Service information extracting unit 320 Multiplexing processing unit 330 Modulation Unit 340 transmitting unit 350 antenna

Claims (8)

A digital broadcast receiver for a digital broadcast system that broadcasts the same service at a plurality of physical frequencies,
A storage unit that stores information indicating a plurality of physical frequencies that broadcast the same service in one region as a single channel list in association with the same channel number;
If the reception quality of the digital broadcast is deteriorated while receiving the digital broadcast in one area, it is based on another physical frequency associated with the channel number of the received digital broadcast in the channel list. A control unit for controlling to receive digital broadcasting;
A digital broadcast receiver characterized by comprising: The digital broadcast receiver according to claim 1,
Each of the physical frequencies is a physical channel.
A digital broadcast receiver characterized by that. The digital broadcast receiver according to claim 1,
Each of the physical frequencies is information indicating a physical channel and a segment.
A digital broadcast receiver characterized by that. In the digital broadcast receiver according to any one of claims 1 to 3,
The storage unit stores, for each region, a channel list in which the correspondence between channel number and information indicating physical frequency is different,
When the control unit cannot obtain a predetermined reception quality by digital broadcast reception control based on another physical frequency indicated in the information stored in the storage unit, from the channel list of the current region, Switch to a local channel list, and control to receive a digital broadcast broadcasting a similar service based on the switched channel list.
A digital broadcast receiver characterized by that. A digital broadcast receiver for a digital broadcast system that broadcasts the same service at a plurality of physical frequencies,
A storage unit that stores information indicating a plurality of physical frequencies that broadcast the same service in one region as a single channel list in association with the same channel number;
Each time a digital broadcast is received, a recording unit that records data indicating a physical frequency corresponding to the reception;
When receiving a digital broadcast in a region and then starting a new digital broadcast, the digital broadcast is received based on the physical frequency indicated in the data recorded in the recording unit. And when a predetermined reception quality is not obtained in the reception by the control, digital data is obtained based on another physical frequency associated with the channel number of the physical frequency indicated in the data in the channel list. A control unit that controls to receive a broadcast;
A digital broadcast receiver characterized by comprising: The digital broadcast receiver according to claim 5, wherein
Each of the physical frequencies is a physical channel.
A digital broadcast receiver characterized by that. The digital broadcast receiver according to claim 5, wherein
Each of the physical frequencies is information indicating a physical channel and a segment.
A digital broadcast receiver characterized by that. The digital broadcast receiver according to any one of claims 5 to 7,
The storage unit stores, for each region, a channel list in which the correspondence between channel number and information indicating physical frequency is different,
When the control unit cannot obtain a predetermined reception quality by digital broadcast reception control based on another physical frequency indicated in the information stored in the storage unit, from the channel list of the current region, Switch to a local channel list, and control to receive a digital broadcast broadcasting a similar service based on the switched channel list.
A digital broadcast receiver characterized by that.

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