JP2008288989A - Digital broadcast reception device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that seamless movement between a service of a general broadcasting device and a service which is different therefrom and broadcasts with a frequency arrangement unknown to a user is impossible. <P>SOLUTION: A digital broadcast transmission and reception device (100) of a digital broadcast system which is broadcasting the same service at a plurality of physical frequencies includes: a storage unit (180) which stores information for receiving frequency organization information showing correspondence relation between physical frequencies at which the digital broadcasting system is delivering broadcastings, and services; and a control unit (110) which performs control to receive a digital broadcast delivering the frequency organization information on the basis of the information stored in the storage unit when a digital broadcast deteriorates in reception quality during the reception of the digital broadcast, to detect the physical frequency at which a service corresponding to the service of the digital broadcast having deteriorated in reception quality from the frequency organization frequency included in the received digital broadcast, and to receive the digital broadcast on the basis of the detected physical frequency. <P>COPYRIGHT: (C)2009,JPO&INPIT

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.

  For example, terrestrial digital television broadcasting operated in Japan is called an 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.

  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 to the broadcasting station channel. There has been proposed a broadcasting apparatus that retransmits data using different predetermined channels (for example, see Patent Document 1). 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 2006-109283 A

  As described in Patent Document 1 above, in the case where each segment of a predetermined channel is broadcasted by 1-segment broadcasting, it is conceivable that the segment arrangement of the service changes when the broadcasting region 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 segment of the channel 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.

  That is, the conventional digital broadcasting technology is based on the premise that each service is broadcast on each specific physical frequency in a certain wide area, and the frequency arrangement is not changed in the specific wide area. It is. However, as in the above-described prior art, even in a certain wide area, a service that was broadcast on a specific physical frequency is rearranged to a completely different frequency and broadcast on a different segment layout. Alternatively, a digital broadcasting apparatus that broadcasts a completely unique service (program) has been proposed. Many of such digital broadcasting apparatuses are small-scale and do not require permission and approval of the Radio Law, and it is expected that service contents, frequency arrangement, and the like are frequently and dynamically changed. Therefore, it is difficult and inappropriate to assign and manage a specific physical frequency in advance as in the prior art. The user carrying the digital broadcast receiving apparatus moves through such various and various digital broadcast reception areas. As described above, the broadcast is performed at a specific physical frequency known to the user. It is not possible to seamlessly move between the service of “general broadcasting device” and the service of “broadcasting device proposed by Patent Document 1”, which is broadcast with a frequency arrangement unknown to the user. If such seamless movement can be realized, it is expected that the convenience of the user will be greatly improved, but such a technique has not been developed. Also, even if a user moves to a reception area that broadcasts a completely unique service, service information (frequency arrangement, etc.) in the broadcast cannot be known.

  Accordingly, an object of the present invention made in view of such circumstances is to be broadcasted on a receiving device without requiring useless processing such as access to a broadcasting station website, channel scanning or segment scanning, and communication costs. It is to provide a digital broadcast receiving apparatus that can easily grasp the frequency arrangement of a service that is being used.

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 for storing information for receiving frequency organization information indicating a correspondence relationship between the physical frequency broadcasted by the digital broadcasting system and the service;
When receiving the digital broadcast, if the reception quality of the digital broadcast deteriorates, the digital broadcast that broadcasts the frequency organization information is received based on the information stored in the storage unit, and the reception From the frequency organization information included in the received digital broadcast, a physical frequency broadcasting a service corresponding to the digital broadcast service whose reception quality has deteriorated is detected, and the digital broadcast is received based on the detected physical frequency A control unit for controlling
It is characterized by comprising.

The digital broadcast receiving apparatus according to one embodiment of the present invention includes:
Further comprising a display,
The controller is
When receiving a digital broadcast that broadcasts the frequency organization information, control to display service information based on the frequency organization information on the display unit,
It is characterized by that.

In addition, a digital broadcast receiving apparatus according to another embodiment of the present invention includes:
The control means is
Control so as to receive a digital broadcast based on the detected physical frequency only when a service is not selected even after a predetermined time has elapsed after displaying the service information on the display unit,
It is characterized by that.

Moreover, a digital broadcast receiving apparatus according to still another 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 for storing information for receiving frequency organization information indicating a correspondence relationship between the physical frequency broadcasted by the digital broadcasting system and the service;
A display unit;
Based on the information stored in the storage unit, a digital broadcast that broadcasts the frequency organization information is received, and service information based on the frequency organization information included in the received digital broadcast is displayed on the display unit. When the displayed service is selected, a control unit that controls to receive a digital broadcast based on a physical frequency corresponding to the selected service;
It is characterized by comprising.

A digital broadcast receiving apparatus according to a further embodiment of the present invention provides:
The control unit is
When receiving the digital broadcast of a predetermined physical frequency, if the reception quality of the digital broadcast deteriorates, the digital broadcast that broadcasts the frequency organization information is received, and the frequency organization information included in the digital broadcast is received. Detecting a physical frequency that is broadcasting a service corresponding to the digital broadcast service of the predetermined physical frequency, and controlling to receive the digital broadcast based on the detected physical frequency;
It is characterized by that.

A digital broadcast receiving apparatus according to a further embodiment of the present invention provides:
A temporary storage unit that temporarily records information indicating the predetermined physical frequency when a digital broadcast of the predetermined physical frequency is received;
The control unit is
When receiving the digital broadcast of the physical frequency detected based on the frequency organization information, if the reception quality of the digital broadcast deteriorates, it corresponds to the digital broadcast service received based on the frequency organization information When a physical frequency broadcasting a service to be detected is received and a digital broadcast is received based on the detected physical frequency, and a physical frequency broadcasting the corresponding service cannot be detected, the temporary storage unit stores Control to receive a digital broadcast based on the predetermined physical frequency indicated in the recorded information,
It is characterized by that.

Moreover, a digital broadcast receiving apparatus according to still another 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 for storing information for receiving frequency organization information indicating a correspondence relationship between the physical frequency broadcasted by the digital broadcasting system and the service;
A display unit;
When receiving an instruction to receive the digital broadcast that broadcasts the frequency organization information based on the information stored in the storage unit when receiving the digital broadcast, according to the detected instruction, A control unit that receives a digital broadcast that broadcasts frequency organization information, and controls to display service information based on the frequency organization information included in the received digital broadcast on the display unit;
It is characterized by comprising.

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

  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 that stores the program substantially corresponding to these, and the scope of the present invention. It should be understood that these are also included.

As an example, a control method of a digital broadcast receiving apparatus according to another embodiment in which the present invention is realized as a method,
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,
A storage step of storing information for receiving frequency organization information indicating a correspondence relationship between the physical frequency broadcasted by the digital broadcasting system and the service in a storage unit;
When receiving the digital broadcast, if the reception quality of the digital broadcast deteriorates, the digital broadcast that broadcasts the frequency organization information is received based on the information stored in the storage unit, and the reception From the frequency organization information included in the received digital broadcast, a physical frequency broadcasting a service corresponding to the digital broadcast service whose reception quality has deteriorated is detected, and the digital broadcast is received based on the detected physical frequency Control steps to control,
It is characterized by having.

  According to the present invention, by using frequency organization information indicating a correspondence relationship between a physical frequency and a service, unnecessary processing such as access to a broadcasting station website, segment scanning within a channel, and communication costs are reduced. In short, the receiving apparatus can easily grasp the frequency arrangement of the service. In other words, a service of “conventional general broadcasting device” broadcasting at a specific physical frequency known to the user, and a service of “broadcasting device broadcasting at an unknown frequency arrangement to the user” different from this service It is possible to move / understand seamlessly between the user and the user convenience.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, terms used in this embodiment will be described. However, the present invention is not limited to this. The “guide channel (ch)” in the embodiment is defined as a channel for broadcasting frequency organization information indicating a correspondence relationship between physical frequencies (segments) and services related to all the transmitted programs. In addition, since the digital broadcast receiving apparatus first receives the segment number 0 in order to refer to the NIT (Network Interface Table), the guide ch is preferably arranged at the segment number 0. Further, “unique broadcast (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 and 300. The broadcasting apparatus 200 is a broadcasting apparatus of a general digital broadcasting system. One segment broadcasting, that is, digital broadcasting using a segment for partial reception that can be received by one segment alone, and terrestrial using 12 segments. Digital broadcasting for 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 switches between the digital broadcast reception of the broadcast apparatus 200 and the digital broadcast reception of the broadcast apparatus 300 via a guide channel (described in detail later).

  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, a guide channel creation unit 350, and an antenna 360. 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 guide channel creation unit 350.

  Based on the service information supplied from the service information extraction units 314A, 314B, and 314Z (for example, SDT: Service Description Table in the PSI / SI information), the guide channel creation unit 350, for example, a segment as shown in FIG. A 1-segment broadcasting data broadcast composed of BML, which is frequency organization information in which a number and a service name (broadcast station) are associated, that is, a TS signal for a guide channel is created. Here, the segment number and the service are associated with each other by assigning segment number 0 to the guide channel, and the remaining segment numbers 1 to 12 are fixed according to the number of TS signals (broadcast stations) received by each receiving unit. A broadcast station name is assigned according to a predetermined program.

  The multiplexing processing unit 320 multiplexes the partial reception TS signal of each channel and the TS signal of the guide 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 360.

  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 broadcasting apparatus 300 that is a normal broadcasting station uses the segment number 0 at the center of 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. Information for linking to each of these services (for example, BML as shown in FIG. 6) is stored in the central segment number 0 which is a guide ch. 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.

  Here, the data broadcasting of the guide channel assigned to the segment number 0 is a function of displaying the physical channel or remote control channel (channel number) of the existing broadcasting station associated with the physical channel in the 1-segment receiving device, and the user It has a role of notifying the tuner section of a segment (frequency) to be tuned at the time of channel selection. For this reason, in this data broadcasting, links are established to all physical channels of existing broadcasting stations and original broadcasting that are services included in the guide ch (in this example, segment numbers in the same physical channel as the guide ch). In the receiving apparatus, the user can select a channel in the physical channel assigned by the guide ch by selecting a link to the channel desired by the user.

  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 tuner unit 120, a demodulation unit 130, an audio decoder unit 140, a video decoder unit 150, a data broadcast decoder unit 160, a screen control unit 170, a memory 180, and an input unit. 190. The receiving apparatus 100 further includes an antenna ANT, a system bus SB, a speaker SP, and a screen display unit DIS.

The operation up to the display of the digital broadcast broadcast by the broadcast device 300 in the reception device 100 will be briefly described. The receiving device 100 carried by the user is in an area where a broadcast wave transmitted from the broadcasting device 300 can be received.
1. The user selects a signal transmitted from the broadcasting device 300. Here, it is assumed that the frequency (channel) transmitted from the broadcasting apparatus is known.
2. When the channel selection is completed, the guide channel is displayed, so the user displays a data broadcast and selects a desired program.
3. The control unit 110 converts the segment number into a frequency and notifies the tuner unit 120 of the frequency.
4). The tuner unit 120 tunes to a frequency designated.

  The function of each part of the receiving apparatus 100 will be described in detail. The receiving apparatus 100 receives a digital broadcast signal by the antenna ANT, and the received RF signal is tuned by the tuner section 120 based on a frequency (channel) designation command from the control section 110 that controls the entire apparatus. The channel signal frequency-converted by the tuner unit 120 is demodulated into an MPEG TS (Transport Stream) signal by the demodulation unit 130, and an audio packet, a video packet, and a data broadcast packet are detected based on the packet ID in the TS signal. Are output to the audio decoder unit 140, the video decoder unit 150, and the data broadcast decoder unit 160. The audio decoder unit 140 decodes the audio data and outputs it to the speaker SP. The video decoder unit 150 decodes the video data and outputs it to the screen control unit 170. The data broadcast decoder unit 160 creates a screen image based on the received BML and outputs it to the screen control unit 170. When the user clicks and selects a desired service (program) using the input unit 190, the control unit 110 determines the segment number broadcasting the service from the BML and tunes it to the frequency of the segment number. The tuner unit 120 is controlled. Further, the data broadcast decoder unit 160 takes out the program guide from the received BML and stores it in the memory 180. The memory 180 stores a channel list, information for receiving a guide channel (a physical channel, a set of physical channels and segments, etc.), a BML, a last channel (last received channel), a program guide, and the like. The screen control unit 170 outputs the data output from the video decoder unit 150 and the data broadcast decoder unit 160 to the screen display unit DIS based on a command from the control unit 110.

  FIG. 5 is a diagram showing a screen image displaying a data broadcast broadcast on the guide channel. FIG. 6 is a diagram showing an example of BML (Broadcast Markup Language) source code used in the guide channel for performing the display of FIG. 5 and switching operation to each channel. As shown in FIGS. 5 and 6, the data broadcast broadcast on the guide channel has links to all the channels that are linked or related, and the user selects the link of the desired channel, You can tune in. For example, when “AAA TV” in FIG. 5 is selected, a function called onTune () newly introduced for channel selection is called according to BML in FIG. 6, and the function is selected according to the value of id. Bureau. In the case of AAA television, “chA” is entered in id, and the channel 11 is selected by browser.tune (“11”). PSI / SI (Program Specific Information / Service Information) information of the connected channels may be put in the data broadcast, and the value may be extracted on the receiver side.

  FIG. 7 shows a correspondence table in which segments included in the data broadcast data of the guide channel are associated with program names. As shown in the figure, the data (data broadcast) stored in the data broadcast of the guide channel needs to contain at least a segment (frequency) and service correspondence table (Table 1). This correspondence table has a role of displaying connected channels on the image display unit DIS on a screen as shown in FIG. 5 and a role of notifying the tuner unit 120 of a segment to be tuned at the time of channel selection.

  FIG. 8 is a flowchart illustrating a first operation flow in which the receiving device 100 switches from the channel of the broadcasting device 200 to the channel of the broadcasting device 300. Here, a case is assumed in which the user carrying the receiving apparatus 100 gradually moves from an area where a normal broadcast apparatus 200 as shown in FIG. 1 can receive a digital broadcast to an area where a broadcast from the broadcast apparatus 300 can be received. As illustrated in FIG. 8, in step S <b> 11, the user uses the input unit 190 to select a channel A for digital broadcasting broadcast by the broadcasting device 200. Upon receiving this channel selection, the tuner unit 120 tunes to channel A, and determines whether channel A exists using the electric field strength or the like (step S12). If channel A exists, channel A is displayed (step S13). If the channel A does not exist, that is, if it cannot be received, the process proceeds to step S15, and the guide channel broadcasted by the broadcasting device 300 is selected. In addition, after step S13, if the reception quality (for example, reception sensitivity or reception image quality) is equal to or less than an arbitrary threshold value N during channel A reception (step S14), the process proceeds to step S15 to select a guide channel. Bureau.

  Upon receiving this tuning, the tuner unit 120 tunes to the guide ch and determines whether the guide ch exists, that is, whether it can be received or not using the electric field strength (step S16). If there is a guide ch, the program guide is acquired from the guide ch (step S17), the channel P of the broadcasting device 300 corresponding to channel A, that is, having the same service ID is selected (step S18), and the channel P is displayed (step S19), and the process ends. If the guide ch does not exist (cannot be received) in step S16, the process proceeds to step S20, “cannot receive” indicating that it cannot be received (message), and the process ends. Here, the program table includes a service ID and a network ID (broadcast station name) and a physical frequency associated with the service ID (in this example, a segment number or a set of physical channel and segment number).

  FIG. 9 is a flowchart illustrating a second operation flow in which the receiving device 100 switches from the channel of the broadcasting device 200 to the channel of the broadcasting device 300. Here, it is assumed that the user who carries the receiving apparatus 100 gradually moves from an area where the digital broadcasting of the normal broadcasting apparatus 200 as shown in FIG. 1 can be received to an area where the broadcasting from the broadcasting apparatus 300 can be received. As illustrated in FIG. 9, in step S <b> 21, the user selects a digital broadcast channel A broadcasted by the broadcast apparatus 200 using the input unit 190. Upon receiving this tuning, the tuner unit 120 tunes to channel A, and determines whether channel A exists, that is, whether or not it can be received using the electric field strength or the like (step S22). If channel A exists, channel A is displayed (step S23). If the channel A does not exist, that is, if it cannot be received, the process proceeds to step S25, and the guide channel broadcasted by the broadcast device 300 is selected. In addition, after step S23, when the reception quality is equal to or lower than an arbitrary threshold value N during channel A reception (step S24), the process proceeds to step S25, and a guide channel is selected.

  Upon receiving this channel selection, the tuner unit 120 tunes to the guide channel, and determines whether the guide channel exists, that is, whether it can be received using the electric field strength (step S26). If the guide ch exists, that is, if it can be received, the program guide is acquired from the guide ch (step S27), and the program guide acquired from the guide ch is displayed (step S28). A channel corresponding to channel A, that is, channel P of broadcasting apparatus 300 having the same service ID as channel A (in this example, at a specific position in a physical channel) after a predetermined time has elapsed since the program table was displayed. Channel number is selected (step S29), and channel P is displayed (step S30). If another user manually designates another channel within a predetermined time, another channel may be selected. If the guide ch cannot be received in step S26, the process proceeds to step S31, displaying “cannot be received” (message) indicating that the guide cannot be received, and the process ends.

  FIG. 10 is a flowchart illustrating a third operation flow in which the receiving device 100 switches from the channel of the broadcasting device 200 to the channel of the broadcasting device 300. Here, it is assumed that the user who carries the receiving apparatus 100 gradually moves from an area where the digital broadcasting of the normal broadcasting apparatus 200 as shown in FIG. 1 can be received to an area where the broadcasting from the broadcasting apparatus 300 can be received. As illustrated in FIG. 10, in step S <b> 41, the user selects a digital broadcast channel A broadcasted by the broadcast apparatus 200 using the input unit 190. Upon receiving this tuning, the tuner unit 120 tunes to channel A, and determines whether channel A exists, that is, whether it can be received, using the electric field strength or the like (step S42). If channel A exists, that is, if channel A can be received, channel A is displayed (step S43). In a case where the channel A cannot be received, the process proceeds to step S45, and a guide channel broadcasted by the broadcasting device 300 is selected. Further, after step S43, when the reception quality becomes an arbitrary threshold value N or less during channel A reception (step S44), the process proceeds to step S45, and the guide channel of the broadcasting device 300 is selected.

  Upon receiving this channel selection, the tuner unit 120 tunes to the guide channel, and determines whether the guide channel exists, that is, whether it can be received using the electric field strength or the like (step S46). If the guide ch exists, that is, if it can be received, the program guide is acquired from the guide ch (step S47), and the program guide acquired from the guide ch is displayed (step S48). After a predetermined time has elapsed since the display of the program guide, the channel corresponding to channel A, that is, channel P of broadcasting apparatus 300 having the same service ID as channel A is selected (step S49), and channel P is displayed. (Step S50), and the process ends. If another user manually designates another channel within a predetermined time, another channel may be selected. If the guide ch cannot be received in step S46, the process proceeds to step S51, and the loop count of the initial value 0 is incremented by 1. After the increment, it is determined whether or not the loop count is greater than or equal to a threshold M equal to or greater than 0 (step S52). If the loop count is not greater than or equal to the threshold value M, that is, smaller than the threshold value M, the process returns to step S41, and the digital broadcast channel A is re-selected. If the loop count is greater than or equal to the threshold value M, a message “message cannot be received” and a message indicating that it cannot be received (message) is displayed (step S53), and the process ends. As described above, according to this operation flow, even if the reception of the guide ch fails, the reception of the guide ch is retried as many times as the threshold value M, so the opportunity to seamlessly move between services via the guide ch is provided. It becomes possible to maximize, and the convenience of the user is further improved.

  FIG. 11 is a flowchart illustrating a first operation flow in which the receiving device 100 switches from the channel of the broadcasting device 300 to the channel of the broadcasting device 200. Here, it is assumed that the user carrying the receiving device 100 gradually moves from an area where the broadcasting of the broadcasting device 300 as shown in FIG. 1 can be received to an area where the digital broadcasting of the ordinary broadcasting device 200 can be received. Further, the channel (channel P in this operation flow) broadcast by the broadcasting device 300 last received and viewed (tuned) by the user is stored in the memory 180 as the last channel, and the program table acquired from the guide ch is also stored in the memory. Assume that it is stored. As shown in FIG. 11, in step S <b> 61, the user uses the input unit 190 to select a guide ch that the broadcast apparatus 300 broadcasts. Upon receiving this tuning, the tuner unit 120 tunes to the guide ch and determines whether the guide ch exists, that is, whether it can be received or not using the electric field strength (step S62). When the guide ch exists, that is, when the guide ch can be received, the program guide is acquired from the guide ch (step S63), and the channel P is selected and displayed (step S64). In step S62, if the guide channel does not exist, that is, if it cannot be received, the process proceeds to step S66, and the digital broadcast channel broadcast by the broadcasting apparatus 200 having the same service ID as channel P from the program guide stored in the memory 180. Is searched (step S66).

  After displaying the channel P in step S64, it is determined whether or not the reception quality is equal to or less than an arbitrary threshold value N during the channel P reception (step S65). If the reception quality is equal to or lower than the threshold value N, the process proceeds to step S66, and a digital broadcast channel having the same service ID as the channel P is searched from the current program guide. If the digital broadcast channel A having the same service ID as the channel P can be received in step S66, the process proceeds to step S67, where the channel A is displayed and the process is terminated. If the digital broadcast channel A broadcasted by the broadcasting device 200 having the same service ID as that of the channel P cannot be received, the process proceeds to step S68, and a message (message) indicating that “cannot be received” cannot be received is displayed (step S68). Finish. As described above, according to this operation flow, it is possible to select a channel using the guide ch, and it is possible to seamlessly shift between services, thereby improving user convenience.

  FIG. 12 is a flowchart illustrating a second operation flow in which the receiving device 100 switches from the channel of the broadcasting device 300 to the channel of the broadcasting device 200. Here, it is assumed that the user who carries the receiving apparatus 100 gradually moves from an area where the broadcasting of the broadcasting apparatus 300 as shown in FIG. 1 can be received to an area where the digital broadcasting of the ordinary broadcasting apparatus 200 can be received. Further, the channel (channel P in this operation flow) broadcast by the broadcasting device 300 last received and viewed (tuned) by the user is stored in the memory 180 as the last channel, and the program table acquired from the guide ch is also stored in the memory. Assume that it is stored. Also, the digital broadcast channel (channel B in this operation flow) broadcasted by the broadcast device 200 last received and viewed (tuned) by the user is also the last channel, and is distinguished from the last channel of the broadcast device 300 in the memory 180. Stored. That is, the memory 180 stores the last channel for each broadcasting device. As shown in FIG. 12, in step S <b> 71, the user uses the input unit 190 to select a guide channel of the broadcasting device 300. Upon receiving this channel selection, the tuner unit 120 tunes to the guide channel, and determines whether the guide channel exists, that is, whether it can be received or not using the electric field strength (step S72). If the guide ch exists, that is, if it can be received, the program guide is acquired from the guide ch (step S73), and the channel P is selected and displayed (step S74). If the guide channel cannot be received, the process proceeds to step S76, and a digital broadcast channel broadcast by the broadcast apparatus 200 having the same service ID as the channel P is searched from the program guide stored in the memory 180. After the channel P is displayed in step S74, if the reception quality becomes an arbitrary threshold value N or less during reception of the channel P (step S75), the process proceeds to step S76, and the same service ID as that of the channel P from the current program guide. The digital broadcast channel broadcasted by the broadcasting device 200 having the above is searched. If there is a digital broadcast channel A broadcasted by the broadcasting device 200 having the same service ID as the currently viewed channel P, that is, if it can be received, the channel A is displayed (step S77), and the process is terminated.

  If it is determined in step S76 that the digital broadcast channel A broadcasted by the broadcast apparatus 200 having the same service ID as the channel P cannot be received, the process proceeds to step S78, and finally the channel selection (reception) is performed in the digital broadcast on the broadcast apparatus 200 side. ) Channel B is selected. Upon receiving this channel selection, the tuner unit 120 tunes to channel B, and determines whether channel B exists, that is, whether it can be received using the electric field strength or the like (step S79). If channel B can be received, channel B is displayed (step S80), and the process ends. If channel B cannot be received, the process proceeds to step S81, “cannot be received” (message) indicating that it cannot be received is displayed, and the process ends.

  FIG. 13 is a flowchart illustrating a third operation flow in which the receiving device 100 switches from the channel of the broadcasting device 300 to the channel of the broadcasting device 200. Assuming the same situation as FIG. 12, steps S91 to S100 in FIG. 13 perform the same processing as steps S71 to S80 in FIG. As shown in FIG. 13, if channel B cannot be received in step S99, the process proceeds to step S101, and the loop count of the initial value 0 is incremented by 1. Next, it is determined whether or not the loop count is equal to or greater than a threshold M equal to or greater than 0 (step S102). If the loop count is not greater than or equal to the threshold value M, that is, smaller than the threshold value M, the process returns to step S91, and the guide ch is selected again. If the loop count is greater than or equal to the threshold value M, a message (message) indicating that “cannot be received” cannot be received is displayed (step S103), and the process ends. Thus, according to this operation flow, even if reception of the guide channel fails, reception of the same service channel P and channel A, or reception of channel B, which is the last channel, is repeated as many times as the threshold M. Since trials can be performed using the guide channel, it is possible to maximize the user's viewing opportunity by maximizing the opportunity to seamlessly transition between services, thereby further improving user convenience.

  In the description of FIG. 10 to FIG. 13, the guide channel is initially selected. This is because the original broadcast may be changed depending on the area. This is to create and deal with changes in independent broadcasting. If the original broadcast does not change depending on the area, the last channel may be selected from the beginning.

  FIG. 14 is a flowchart showing an operation flow when a button for selecting a guide channel and displaying a program guide is pressed. As shown in the figure, in step S111, the user presses the program guide display button of the input unit 190. Upon receiving this channel selection, the tuner unit 120 tunes to the guide channel broadcasted by the broadcast device 300 (step S112), and determines whether the guide channel exists, that is, can be received using the electric field strength or the like ( Step S113). If the guide ch exists, that is, if the guide ch can be received, the program guide is acquired from the guide ch (step S114), and the program guide is displayed (step S115). If the guide ch does not exist in step S113, that is, if it cannot be received, the process proceeds to step S116, “cannot be received” (message) is displayed and a process is terminated. In this way, it is possible to adopt a configuration in which only the program guide is acquired and displayed, and then the user selects a desired program.

Finally, the effects of the embodiments of the present invention are summarized as follows.
1. Since the current 1-segment receiver is tuned to the segment (segment number 0) for partial reception when the channel is selected, the segment number 0 of the channel (frequency) transmitted from the broadcasting device 300 such as a gap filler is set. By arranging a guide channel including information including frequency organization information, the receiver can know which service is being broadcast simply by selecting a channel (frequency) transmitted from the broadcasting device 300. I can do it.
2. Also, if it is not possible to receive a channel (frequency) transmitted from the broadcasting device 300 (that is, if it is outside the area of the broadcasting device 300), it is highly likely that a service that is broadcast independently cannot be received. The user may not perform a useless operation (for example, channel scan).
3. On the other hand, if the guide channel can be received, it can be understood that the user is within the area of the broadcasting device 300. That is, there is a high possibility that the service transmitted by the broadcasting device 300 can be received.
4). Even if a weak electric field is received during reception of a certain digital broadcasting channel broadcasted by the broadcasting device 300, if the guide channel broadcasted by the broadcasting device 300 can be searched and received, the same service as the channel that was viewed is selected. Since it is displayed, it is possible to seamlessly switch from the normal channel of the broadcast device 200 to the channel of the broadcast device 300 without the user being aware of it.

5. On the other hand, even if a weak electric field is received during reception of the channel of the broadcasting device 300, the channel of the broadcasting device 200 having the same service as the service being watched is selected and displayed. Can be switched to the channel of the broadcasting apparatus 200.
6). Since the program information is displayed when the button assigned with the function of receiving the segment storing the frequency organization information of the broadcasting device 300 is pressed, the user can know the program of the broadcasting device 300 at any time.

  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.

  For example, as shown in FIG. 3, a mode has been described in which the guide ch and each channel (service) associated therewith are accommodated in one physical channel, but the present invention is limited to this. It is not a thing. That is, the guide channel is broadcast in a certain frequency band regardless of the physical channel or segment, and frequency information (physical channel, physical channel and segment) in which each service and each service associated therewith is broadcast on this guide channel. It is sufficient to store a set of numbers or similar items. Further, in the present invention, the guide ch is described as being transmitted from the broadcasting device 300, but the broadcasting device 200 that is a broadcasting device that performs normal broadcasting, or other spot devices that are provided in a completely separate spot. You may broadcast an original service and a guide channel from a broadcasting apparatus. In other words, in the present invention, it is only necessary to be able to receive frequency organization information indicating the correspondence between physical frequencies and services regardless of the broadcasting device, and broadcasting devices that broadcast services guided by frequency organization information (guide ch) are also available. Note that it doesn't matter. In addition, although the service guided by the guide channel is a connected segment in a specific physical channel, this is merely an example, and the service guided by the guide channel is a separate physical channel, or It may be accommodated in any segment of a separate physical channel. FIG. 15 shows an example of the frequency arrangement used by the broadcasting device 300. As shown in FIG. 15, this includes a mode in which a certain frequency band (physical channel or segment) is used as a guide channel, and frequency organization information indicating a correspondence relationship between another frequency band (physical channel or segment) and a service is broadcast.

  In addition, the broadcasting apparatus 300 illustrated in FIGS. 1 and 2 has been described with a configuration that receives a TS signal through an optical fiber. However, the broadcasting apparatus 300 is not limited thereto, and for example, a receiving antenna is provided and used. It may be configured as a relay device or a gap filler device that receives an RF signal from another broadcasting device.

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 the screen image which displayed the data broadcast currently broadcast by guide ch. It is a figure which shows an example of the source code of BML (Broadcast Markup Language) used by guide ch. It is the correspondence table which linked | related the segment contained in the data broadcasting data of a guide channel, and a program name. 10 is a flowchart illustrating a first operation flow in which the receiving device 100 switches from a channel of the broadcasting device 200 to a channel of the broadcasting device 300. 12 is a flowchart illustrating a second operation flow in which the receiving device 100 switches from the channel of the broadcasting device 200 to the channel of the broadcasting device 300. 10 is a flowchart illustrating a third operation flow in which the receiving device 100 switches from the channel of the broadcasting device 200 to the channel of the broadcasting device 300. 4 is a flowchart showing a first operation flow in which the receiving apparatus 100 switches from the channel of the broadcasting apparatus 300 to the channel of the broadcasting apparatus 200. 10 is a flowchart illustrating a second operation flow in which the receiving device 100 switches from the channel of the broadcasting device 300 to the channel of the broadcasting device 200. 10 is a flowchart showing a third operation flow in which the receiving apparatus 100 switches from the channel of the broadcasting apparatus 300 to the channel of the broadcasting apparatus 200. It is a flowchart which shows the operation | movement flow when the button for selecting a guide ch and displaying a program schedule is pressed. FIG. 3 is a diagram illustrating an example of a frequency arrangement used by the broadcasting device 300.

Explanation of symbols

100 receiving device 110 control unit 120 tuner unit 130 demodulating unit 140 audio decoder unit 150 video decoder unit 160 data broadcast decoder unit 170 screen control unit 180 memory 190 input unit DIS screen display unit SB system bus SP speaker ANT antenna 200, 300 broadcasting device 310A, 310B, 310Z chA signal receiver, chB signal receiver, chZ signal receiver 312A, 312B, 312Z TS signal receiver 314A, 314B, 314Z Service information extractor 320 Multiplexer 330 Modulator 340 Transmitter 350 Guide Channel creation unit 360 Antenna

Claims (13)

A digital broadcast receiver for a digital broadcast system that broadcasts the same service at a plurality of physical frequencies,
A storage unit for storing information for receiving frequency organization information indicating a correspondence relationship between the physical frequency broadcasted by the digital broadcasting system and the service;
When receiving the digital broadcast, if the reception quality of the digital broadcast deteriorates, the digital broadcast that broadcasts the frequency organization information is received based on the information stored in the storage unit, and the reception From the frequency organization information included in the received digital broadcast, a physical frequency broadcasting a service corresponding to the digital broadcast service whose reception quality has deteriorated is detected, and the digital broadcast is received based on the detected physical frequency A control unit for controlling
A digital broadcast receiver characterized by comprising: The digital broadcast receiver according to claim 1,
Further comprising a display,
The controller is
When receiving a digital broadcast that broadcasts the frequency organization information, control to display service information based on the frequency organization information on the display unit,
A digital broadcast receiver characterized by that. The digital broadcast receiver according to claim 2,
The control means is
Control so as to receive a digital broadcast based on the detected physical frequency only when a service is not selected even after a predetermined time has elapsed after displaying the service information on the display unit,
A digital broadcast receiver characterized by that. In the digital broadcast receiver according to any one of claims 1 to 3,
Each of the plurality of physical frequencies is a physical channel.
A digital broadcast receiver characterized by that. In the digital broadcast receiver according to any one of claims 1 to 3,
Each of the physical frequencies is information indicating a physical channel and a segment.
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 for storing information for receiving frequency organization information indicating a correspondence relationship between the physical frequency broadcasted by the digital broadcasting system and the service;
A display unit;
Based on the information stored in the storage unit, a digital broadcast that broadcasts the frequency organization information is received, and service information based on the frequency organization information included in the received digital broadcast is displayed on the display unit. When the displayed service is selected, a control unit that controls to receive a digital broadcast based on a physical frequency corresponding to the selected service;
A digital broadcast receiver characterized by comprising: The digital broadcast receiver according to claim 6, wherein
The control unit is
When receiving the digital broadcast of a predetermined physical frequency, if the reception quality of the digital broadcast deteriorates, the digital broadcast that broadcasts the frequency organization information is received, and the frequency organization information included in the digital broadcast is received. Detecting a physical frequency that is broadcasting a service corresponding to the digital broadcast service of the predetermined physical frequency, and controlling to receive the digital broadcast based on the detected physical frequency;
A digital broadcast receiver characterized by that. The digital broadcast receiver according to claim 6, wherein
A temporary storage unit that temporarily records information indicating the predetermined physical frequency when a digital broadcast of the predetermined physical frequency is received;
The control unit is
When receiving the digital broadcast of the physical frequency detected based on the frequency organization information, if the reception quality of the digital broadcast deteriorates, it corresponds to the digital broadcast service received based on the frequency organization information When a physical frequency broadcasting a service to be detected is received and a digital broadcast is received based on the detected physical frequency, and a physical frequency broadcasting the corresponding service cannot be detected, the temporary storage unit stores Control to receive a digital broadcast based on the predetermined physical frequency indicated in the recorded information,
A digital broadcast receiver characterized by that. In the digital broadcast receiver according to any one of claims 6 to 8,
Each of the physical frequencies is a physical channel.
A digital broadcast receiver characterized by that. In the digital broadcast receiver according to any one of claims 6 to 8,
Each of the physical frequencies is information indicating a physical channel and a segment.
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 for storing information for receiving frequency organization information indicating a correspondence relationship between the physical frequency broadcasted by the digital broadcasting system and the service;
A display unit;
When receiving an instruction to receive the digital broadcast broadcasting the frequency organization information based on the information stored in the storage unit when receiving the digital broadcast, in response to the detected instruction, A control unit that receives a digital broadcast that broadcasts frequency organization information, and controls to display service information based on the frequency organization information included in the received digital broadcast on the display unit;
A digital broadcast receiver characterized by comprising: The digital broadcast receiver according to claim 11, wherein
Each of the physical frequencies is a physical channel.
A digital broadcast receiver characterized by that. The digital broadcast receiver according to claim 11, wherein
Each of the physical frequencies is information indicating a physical channel and a segment.
A digital broadcast receiver characterized by that.

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