JP2004120452A - Digital broadcast receiver and receiving method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast receiver capable of detecting appendant information of other system even when one system is selected from a plurality of digital broadcast systems. <P>SOLUTION: This digital broadcast receiver selects one optional system from a plurality of digital broadcast systems and decodes transport stream of the system. The receiver is individually formed front side receiving circuits 2 and 12 from tuners 3 and 13 to demultiplexers 6 and 16 for every reception path of each digital broadcast system. This receiver is provided with a selection control unit 21 which detects packet of appendant information from transport stream of each digital broadcast system, and switches output destination of each packet, an appendant information decoding part 51, and a storage part which stores the content of the decoded appendant information. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital broadcast receiver capable of viewing digital broadcast programs of a plurality of systems, such as satellite digital broadcast and terrestrial digital broadcast, and acquiring ancillary information multiplexed into the digital broadcast signal. The present invention relates to a digital broadcast receiver capable of efficiently acquiring EPG (Electrical Program Guide) information among attached information.
[0002]
[Prior art]
The conventional digital broadcast receiving apparatus stores the electronic program guide information in a non-volatile memory when the power is turned off so that the electronic program guide (a type of attached information) can be obtained immediately when the power is turned on after the power is turned off. In some cases, the electronic program guide information is read from a nonvolatile memory when the power is turned on next (for example, see Patent Document 1).
[0003]
In addition, the conventional digital broadcast receiving apparatus is provided with a second tuner that cyclically tunes to each channel in order to easily grasp the contents of each program during multi-screen display and efficiently select a desired program. In some cases, genre information corresponding to the channel selected by the second tuner is extracted from the electronic program guide information, and genre information is additionally displayed on a multi-screen (for example, see Patent Document 2).
[0004]
In addition, the conventional digital broadcast receiving apparatus provides useful information to the user and displays a video of a program selected from a plurality of multiplexed programs so that the user can easily view a desired program. When displaying on the display means, the character string data is also included in the data of the selected program, the character string data is also displayed, and the selected program displayed on the display means is included in the character string data by the switching control means. In some cases, the program is switched to a currently broadcasted program corresponding to a predetermined character string (for example, see Patent Document 3).
[0005]
[Patent Document 1]
JP-A-2002-142163 (first page: abstract, fourth page, FIGS. 2-3)
[Patent Document 2]
JP-A-2002-135679 (1st page: Abstract, 3rd to 4th pages, FIGS. 3 to 5)
[Patent Document 3]
JP-A-2002-135667 (page 1: abstract, pages 5 to 7, FIGS. 1 to 5)
[0006]
In the conventional digital broadcast receiving apparatus, the electronic program guide information multiplexed in the digital broadcast as described above is extracted, stored in the nonvolatile memory, displayed on the multi-screen, and corresponding to the displayed character string data. Switching to programs was being carried out.
[0007]
[Problems to be solved by the invention]
However, the configuration and operation of the above-mentioned conventional digital broadcast receiving apparatus are configured to receive only one of the digital broadcasts, even when there are digital broadcasts of a plurality of systems such as satellite digital broadcast and terrestrial digital broadcast. For example, in the case of selecting and decoding (and viewing / listening) any one digital broadcast from a plurality of digital broadcasts, a transport stream (hereinafter, referred to as TS) signal of another type is used. Could not be decrypted. Therefore, when digital broadcasting of one system is selected, it is not possible to detect additional information (electronic program guide information) of another system.
[0008]
Therefore, in a conventional digital broadcast receiving apparatus capable of receiving a plurality of conventional systems, a channel to be selected is changed while switching the system, for example, when a channel to be selected is changed from a satellite digital broadcast channel to a terrestrial digital broadcast channel. In the case of switching, in the digital broadcasting of the switched system, a new electronic program guide information is extracted after the switching, and a program is selected and the like. There was a problem that time was required.
[0009]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described conventional problems. Even when digital broadcasting of one system is selected, additional information (electronic program guide information) of another system is used. It is an object of the present invention to provide a digital broadcast receiving apparatus capable of detecting a digital broadcast.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, a digital broadcast receiving apparatus according to the present invention selects an arbitrary one type of digital broadcast from a plurality of types of digital broadcasts, and displays a plurality of channels of video multiplexed with that type of digital broadcast. A digital broadcast receiving apparatus capable of decoding a TS including a signal packet, an audio signal packet, and an auxiliary information packet, comprising: a tuner section, a demodulation section, a descrambler section, and a demultiplexer section. A receiving circuit is individually formed for each receiving path of each digital broadcasting system, a TS from each front-side receiving circuit is input, a packet of ancillary information is detected from the TS, and a packet of each packet is detected based on the detection result. A selection control unit for switching an output destination, an auxiliary information decoding unit for decoding a packet of the auxiliary information, and storing the content of the decoded auxiliary information And a 憶部, selection control section outputs the packets of the detected attached information to the auxiliary information decoding unit, accessory information decoding unit is for storing the accessory information decoded in the storage unit.
[0011]
Further, the receiving method of the digital broadcast receiving apparatus according to the present invention is a method of selecting an arbitrary one type of digital broadcast from a plurality of types of digital broadcasts, and a packet of a plurality of channels of video signals multiplexed with the digital broadcast of the type. A transport stream including a packet of an audio signal and a packet of ancillary information can be received on an individual reception path for each digital broadcast system. By detecting a packet of each transport stream, the packet of the ancillary information is A method of receiving a digital broadcast receiving apparatus, which decodes and stores a video signal and a packet of an audio signal without being limited to a channel of the packet, comprising the steps of: selecting a digital broadcast system and a channel selected by a viewer; Digital broadcast system and channel selected by the viewer from the port stream In addition, a step of selecting a packet of ancillary information of the non-selected digital broadcasting system and channel, and a background of all ancillary information of the unselected digital broadcasting system in addition to the currently selected digital broadcasting system It has a step of acquiring by processing.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a digital broadcast receiving apparatus according to Embodiment 1 of the present invention.
[0013]
The digital broadcast receiving apparatus shown in FIG. 1 can be any digital broadcast from a plurality of digital broadcasts, such as satellite digital broadcast (for example, broadcast satellite (BS) digital broadcast, communication satellite (CS) digital broadcast, etc.) and terrestrial digital broadcast. This is a digital broadcast receiving apparatus capable of selecting digital broadcasting of one system, and decoding packets of ancillary information in addition to video and audio signals of a plurality of channels multiplexed with the digital broadcasting of that system. The signal in which the video signal, the audio signal, and the packet of the auxiliary information are multiplexed is a transport stream (TS). The video signal packet and the audio signal packet are, for example, a video transport packet and an audio transport packet conforming to the MPEG (Moving Picture Experts Group) 2 standard. , PSI (Program Specific Information) and the like. The electronic program guide information (EPG) is transmitted as one type of PSI, and the EPG has table format information such as an event information table (EIT). It contains information such as the start time and the program inheritance schedule.
[0014]
FIG. 2 is a diagram illustrating an example of the electronic program guide information. In this example, the programs (genre: title) for each time from 10:00 to 12:00 on the channels 101 to 103 are shown in a table format.
[0015]
For example, the channel 101 is a drama exclusive channel, and broadcasts drama B and drama C (where A, B and C are titles) following drama A. The channel 102 is a channel that broadcasts various contents. After broadcasting a baseball D (D is, for example, a league match between the professional team X and the professional team Y) in a sport, a news E (E is a title) is broadcast. After that, an educational program F (F is a title) such as an English conversation course is broadcasted thereafter. The channel 103 is an entertainment channel, and broadcasts a movie H (H is a title) after broadcasting a soccer G (G is, for example, a cup match between a professional team P and a professional team Q) in a sport.
[0016]
A front side receiving circuit 2 for satellite digital broadcasting includes a tuner unit 3 for obtaining a target frequency signal from a received signal (intermediate frequency: IF signal) of satellite digital broadcasting received and down-converted by the satellite antenna 1 by frequency conversion or the like, and tuning. Demodulation unit 4 for demodulating the demodulated signal, de-scrambler unit 5 for de-polarizing the demodulated signal, and demultiplexing the de-polarized demodulated signal to extract packets for each individual channel. And a demultiplexer 6.
[0017]
On the other hand, the terrestrial digital broadcast front-side receiving circuit 12 is a tuner section that obtains a target frequency signal from a terrestrial digital broadcast reception signal (VHF or UHF band signal) received by the terrestrial antenna 11 by frequency conversion or the like. 13, a demodulation unit 14 for demodulating the tuned frequency signal, a de-scrambler unit 15 for de-polarizing the demodulated signal, and a de-multiplexing of the de-polarized demodulated signal for each individual channel. It comprises a demultiplexer 16 for extracting packets.
[0018]
In the front-side receiving circuits 2 and 12, for example, the demodulation unit 4 demodulates a signal modulated by a digital modulation method such as 8PSK, QPSK or BPSK, and outputs an MPEG2 TS. Further, for example, TMCC processing, error correction processing, deinterleaving processing, and the like are performed on the encoded input signal. On the other hand, the demodulation unit 14 demodulates a broadcast signal digitally modulated by the OFDM method and outputs an MPEG2 TS. Further, the coded received signal is subjected to processing such as error correction, deinterleaving, and energy spreading.
[0019]
The de-scramblers 5 and 15 perform, for example, a decryption process on a TS that has been encrypted by the block cipher Multi2. The scramble is decoded using the individual information stored in the IC card or the like and the information transmitted from the digital broadcast, and the TS is output.
[0020]
The demultiplexers 6 and 16 extract necessary packets from the MPEG2 TS by filtering. A required packet is demultiplexed from a packet processed based on the MPEG2-Systems standard and output.
[0021]
In the present embodiment, a front-side receiving circuit 2 for satellite digital broadcasting and a front-side receiving circuit 12 for terrestrial digital broadcasting in a digital broadcast receiving apparatus are separately provided for each receiving path of a different digital broadcasting system. .
[0022]
The selection control unit 21 receives the TS from each of the front-side receiving circuits 2 and 12, and based on the header information (packet ID and the like) of the packet and the selection of the viewer (user), a video signal and an audio signal. , The packet of the attached information is detected, and the output destination of each packet is switched based on the detection result. At this time, the selection control unit 21 detects packets from the TSs input from the individual front-side receiving circuits 2 and 12 for each of the plurality of digital broadcasting schemes and sorts the output destinations. Perform detection and switching of output destination. For detection of each packet, for example, the content of the buffer memory in the selection control unit 21 may be determined by the reception device control unit 71, or the content detected in advance by the front side reception circuits 2 and 12 may be used.
[0023]
For example, when the packet is a video signal, the video signal of the selected digital broadcasting system and the selected channel is output to a video signal decoding unit described later. If the packet is an audio signal, the audio signal of the selected digital broadcasting system and the selected channel is output to the audio signal decoding unit 31 described later. When the packet is the accessory information, in addition to the accessory information of the selected digital broadcasting system, the accessory information of the unselected digital broadcasting system is also output to the accessory information decoding unit 51 described later.
[0024]
The audio signal decoding unit 31 decodes the audio signal packet output from the selection control unit 21 into an audio stream encoded by a method such as AAC or AC-3, and outputs the packet to the audio control unit 32. I do.
[0025]
The audio control unit 32 subjects the digital audio signal output from the audio signal decoding unit 31 to, for example, DA conversion or amplification processing for converting the decoded digital audio signal into an analog audio signal, and performs speaker processing. And the like.
[0026]
The video signal decoding unit 41 decodes and outputs a packet of the video signal output from the selection control unit 21. For example, decoding processing of a video stream encoded by MPEG2-Video is performed, and a digital video signal is output.
[0027]
The video control unit 42 converts, for example, a decoded digital video signal output from the video signal decoding unit 41 into an analog video signal, or synthesizes a graphic screen of character information such as an electronic program guide. And the like, and output it so that it can be displayed on a display.
[0028]
The attached information decoding unit 51 decodes and outputs the attached information packet (encoded) output from the selection control unit 21. In the present embodiment, EPG packets are decoded and output, especially among the attached information. For example, EPG data is obtained from a table such as PAT, PMT, or EIT defined by the MPEG2-Systems standard, and a graphic screen of an electronic program guide is created and output.
[0029]
In addition, at least the content of the decoded additional information in the digital broadcasting system that is not selected is stored in the nonvolatile storage unit 61. For example, when a program of a certain channel of the digital terrestrial broadcast is selected, at least the auxiliary information of the digital terrestrial broadcast is stored in the storage unit 61, and conversely, a program of the certain channel of the digital terrestrial broadcast is selected. In this case, at least the satellite digital broadcast accessory information is stored in the storage unit 61. Of course, additional information about the digital broadcast selected at that time may be stored in the storage unit 61.
[0030]
The storage unit 61 is a memory necessary for the system, such as an NVRAM, a RAM, and a ROM. The writing and reading of data are performed by the receiving device control unit 71 and the attached information decoding unit 51, which will be described later, as necessary. As a memory selection criterion, when all processes are completed while the power is on, the data may be stored in a nonvolatile storage element such as a DRAM. Also, when the auxiliary information before the power is turned off can be used, the information is stored in a nonvolatile storage element such as an NVRAM (for example, a flash memory).
[0031]
The receiving device control unit 71 is configured by, for example, a microprocessor or the like, and integrally controls the above-described units in order to receive and output digital broadcasting of each system. For example, the control of the storage unit 61 and the control of each unit based on the request of the viewer, such as the setting of the receiving channel for the tuner units 3 and 13, the selection and switching of the selection control unit 21, the graphic image synthesis and display by the video control unit 42, and the like Make the settings for
[0032]
A control signal between the receiving device control unit 71 and each unit is transmitted by the internal bus 81. Further, for example, data of the attached information decoded by the attached information decoding unit 51 is also transmitted to the storage unit 61 by the internal bus 81.
[0033]
By the way, in the domestic terrestrial digital broadcasting system, it is necessary to select a channel to be received from a plurality of channels in the system in order to acquire additional information. That is, in the case of terrestrial digital broadcasting, it is not possible to collectively acquire the additional information of all the channels, and it is not possible to acquire the additional information unless individual channels are selected.
[0034]
Therefore, when receiving the terrestrial digital broadcast, the selection control unit 21 according to the present embodiment determines the packet to be output to the video signal decoding unit 41 and the packet to be output to the audio signal decoding unit 31 by the selected digital broadcasting system. The packet output to the attached information decoding unit 51 is a demultiplexer unit in the front-side receiving circuit 12 of the terrestrial digital broadcasting system in which it is necessary to select a receiving channel. By sequentially selecting all the reception channels separated at 16, the additional information of each channel is obtained.
[0035]
The additional information detected and stored in the present embodiment is, for example, electronic program guide information (EPG) as described above. Therefore, the selection control unit 21 of the present embodiment selects and outputs at least a packet of the electronic program guide information from the attached information, and the attached information decoding unit 51 outputs at least the packet of the electronic program guide information from the attached information. The packet is decoded and stored in the storage unit 61.
[0036]
FIG. 3 is a block diagram showing an example of the inside of the selection control unit 21 of FIG.
The TS output from the front receiving circuit 2 of the satellite digital broadcasting system is input to the buffer memory 22 from the terminal of the TS input 1 of the selection control unit. The TS output from the terrestrial digital broadcast system front receiving circuit 12 is input to the buffer memory 23 from the terminal of the TS input 2 of the selection control unit.
[0037]
The switching unit 24 selects an output destination for each packet based on a control input from the reception device control unit 71. The audio signal packet and the video signal packet are output from the terminal of the TS output 1 of the selection control unit 21 to the audio signal decoding unit 31 or the video signal decoding unit 41. The auxiliary information such as the electronic program guide information is output from the terminal of the TS output 2 of the selection control unit 21 to the auxiliary information (EPG) decoding unit 51 when the type of the auxiliary information needs to be decoded immediately. Is done.
[0038]
Among the auxiliary information, the electronic program guide information (EPG) does not need to be immediately decoded. However, for example, the billing information of a pay broadcast is the type of auxiliary information that needs to be immediately decoded. .
[0039]
When the attached information is of a type that does not need to be immediately decoded, such as electronic program guide information, the selection control unit 21 selects a packet of the attached information before decoding according to a control input from the receiving device control unit 71. The data is temporarily stored in a non-volatile storage unit 61 or the like from a storage unit output terminal of the control unit 21. When the same type of packet is accumulated in a predetermined amount or more, the selection control unit 21 reads out the packet again from the storage unit 61 or the like according to an instruction from the reception device control unit 71 and switches the packet input from the terminal of the storage unit output to the switching unit. The signal is switched at 24 and output from the terminal of the TS output 2 to the attached information (EPG) decoding unit 51.
[0040]
As described above, the auxiliary information that does not require immediacy for decoding is temporarily stored in the storage unit 61 or the like, and is stored to a predetermined amount. Can be reduced, and a predetermined amount of the same type of packets can be continuously output, so that the processing efficiency of the auxiliary information (EPG) decoding unit 51, which is a subsequent circuit, can be improved.
[0041]
Here, the difference between the present embodiment and the configuration of a conventional digital broadcast receiving apparatus will be described.
Even in the case of a conventional digital broadcast receiving apparatus, for example, up to the demodulation unit 4 for satellite digital broadcasting and the demodulation unit 14 for terrestrial digital broadcasting in FIG. 1 are independent receiving circuits for each broadcasting system. However, the outputs of the demodulation units 4 and 14 are selected by the selector unit and input to the de-scrambler unit 5 and the de-multiplexer unit 6 common to each broadcasting system. The signals are input to the decoding units 31, 41, and 51.
[0042]
That is, in the case of the conventional digital broadcast receiving apparatus, the selector selects one of the two TS inputs selected by the viewer from the two TS inputs, and receives the satellite digital broadcast reception TS and the terrestrial digital broadcast reception TS. And outputs the same to the circuit after the descrambler 5 common to each broadcasting system.
[0043]
In other words, in the case of the conventional digital broadcast receiving device, the descrambler unit 5 and the demultiplexer unit 6 are common, and only the packets of the satellite digital broadcast are selected by the selector unit. When a channel (program) is selected (received), a terrestrial digital broadcast packet is not input to circuits subsequent to the selector unit. Therefore, in the case of the conventional digital broadcast receiving apparatus, the auxiliary information decoding section 51 can decode the auxiliary information of the satellite digital broadcast, but cannot decode the auxiliary information of the terrestrial digital broadcast because the auxiliary information is not input.
[0044]
On the other hand, in the digital broadcast receiving apparatus of the present embodiment shown in FIG. 1, for example, when a viewer is watching a satellite digital broadcast, the electronic program guide information of each station broadcasting the terrestrial digital broadcast is transmitted. Can be decrypted and stored. In addition, the storage (acquisition) can be automatically performed by a background process of a process for the viewer to view the digital satellite broadcasting.
[0045]
Next, the operation of the digital broadcast receiving apparatus of FIG. 1 will be described.
FIG. 4 is a flowchart showing the operation of the digital broadcast receiving apparatus of FIG. 1 when the viewer's selection is a satellite digital broadcast program, and FIG. 5 is a terrestrial digital broadcast program when the viewer's selection is performed. 2 is a flowchart showing an operation of the digital broadcast receiving apparatus of FIG. 1 in a case.
[0046]
First, a determination is made as to whether or not the content selected by the viewer is a satellite digital broadcast program (S1). If the selected content is a satellite digital broadcast program (S1: YES), the front-side receiving circuit 2 uses the satellite. The channel of the digital broadcast is selected (S2), and the selection control unit 21 determines whether or not the input packet of the satellite digital broadcast is the additional information (EPG) (S3), and in the case of the additional information (S3: YES). In step S4, the packet is selected, decoded by the attached information decoding unit 51, stored in the storage unit 61, and acquired (S4).
[0047]
If the satellite digital broadcast packet to be input is not the accessory information (S3: NO), the packet is an audio signal or a video signal of the channel selected by the viewer. The audio signal packet is output to the audio signal decoding unit 31 for decoding, and is sent from the audio control unit 32 as an audio output to a speaker or the like. The video signal packet is output to the video signal decoding unit 41 to be decoded, and is transmitted from the video control unit 42 as a video output to a display device or the like.
[0048]
After acquiring the satellite digital broadcast accessory information in step S4, the selection control unit 21 and the reception device control unit 71 control the front-side reception circuit 12 to individually and sequentially select channels of the terrestrial digital broadcast. (S5). First, when the first channel is selected, the packet of the attached information is selected by the selection control unit 21, decoded by the attached information decoding unit 51, stored in the storage unit 61, and acquired (S6). Next, it is determined whether or not the acquisition of the accessory information of all the terrestrial digital broadcasting channels has been completed (S7), and if the acquisition of the accessory information of all the channels (terrestrial waves) has been completed (S7: YES), Although the process is terminated, if the acquisition of the accessory information of all the channels (terrestrial waves) has not been completed (S7: NO), the process returns to step S5 again to select the next channel and repeat steps S6 and S7. Is repeated until all channels (terrestrial waves) are executed.
[0049]
In the case where the viewer's selection is a program of satellite digital broadcasting, auxiliary information (EPG) of terrestrial digital broadcasting is automatically obtained by background processing for viewing the program desired by the viewer in this way. Can be.
[0050]
On the other hand, if the content selected by the viewer is a terrestrial digital broadcast program (S1: NO), the process proceeds to step S11 in FIG. 5, and the front-side receiving circuit 12 selects a terrestrial digital broadcast channel. (S11) The selection control section 21 determines whether or not the input terrestrial digital broadcast packet is accessory information (EPG) (S12). If the packet is accessory information (S12: YES), the packet is selected. Then, it is decoded by the attached information decoding unit 51 and stored in the storage unit 61 to acquire (S13).
[0051]
If the input terrestrial digital broadcast packet is not the accessory information (S12: NO), the packet is an audio signal or a video signal of the channel selected by the viewer. Therefore, in this case, as in the case of the satellite digital broadcasting described above, the audio signal packet is output to the audio signal decoding unit 31 to be decoded, and is sent from the audio control unit 32 as an audio output to a speaker or the like. . The video signal packet is output to the video signal decoding unit 41 to be decoded, and is transmitted from the video control unit 42 as a video output to a display device or the like.
[0052]
After acquiring the terrestrial digital broadcast accessory information in step S13, the selection control unit 21 and the reception device control unit 71 control the front side reception circuit 2 to select an arbitrary channel of the satellite digital broadcast and perform the selection control. The packet of the attached information is selected by the unit 21, decoded by the attached information decoding unit 51, stored in the storage unit 61, and acquired (S14). In the case of satellite digital broadcasting, it is not necessary to select channels individually and sequentially as in the case of terrestrial digital broadcasting.
[0053]
Next, it is determined whether or not the acquisition of the auxiliary information of all the satellite digital broadcasts has been completed so as to support satellite digital broadcasts of different systems such as BS and CS (S16). If the additional information of the satellite digital broadcasting has not been obtained (S16: NO), the process is terminated. If the additional information of all the satellite digital broadcasts has not been obtained (S16: NO), the process returns to step S14. The satellite digital broadcasting of the next system is received, and the processing of steps S14 and S15 is repeated until the processing is performed on the satellite digital broadcasting of all the systems.
[0054]
When the viewer's selection is a terrestrial digital broadcast program, the satellite digital broadcast auxiliary information (EPG) is automatically acquired in the background processing for viewing the desired program by the viewer in this way. Can be. Note that the auxiliary information of the terrestrial digital broadcasting in the case of FIG. 1 is only information corresponding to the selected channel. It is also possible to acquire additional information by background processing.
[0055]
In the present embodiment, the auxiliary information (EPG) automatically acquired by the background processing is stored in the non-volatile storage unit 61, so that the power is once turned off and then turned on again. In this case, the EPG can be read quickly.
[0056]
As described above, in the present embodiment, a digital broadcast receiving apparatus that can select and receive an arbitrary one type of digital broadcast from a plurality of types of digital broadcasts, such as a satellite digital broadcast and a terrestrial digital broadcast, is provided. When one channel in digital broadcasting of one system is selected, additional information (EPG) of another system is automatically acquired by background processing and stored in a storage unit. Even when switching channels while switching, it is not necessary to newly select auxiliary information after switching and then to select a program, etc., so that it is possible to reduce the time for searching for a program or switching channels after switching the system.
[0057]
Further, in the present embodiment, since the auxiliary information (EPG) of another system automatically acquired by the background processing is stored in the non-volatile storage unit, the digital broadcast which is not selected in the previous viewing is stored. Even when watching a channel of the system, there is no need to extract the additional information and then select a program when selecting that channel. Etc. time can be reduced.
[0058]
In particular, when a satellite digital broadcast channel is selected for viewing, ancillary information (EPG) that cannot be obtained unless each channel of the terrestrial digital broadcast is circulated by background processing and selected for each channel is used. Since it is obtained and stored in the storage unit, when subsequently viewing the terrestrial digital broadcast channels, it is possible to quickly use the accessory information for every channel.
[0059]
By the way, in the above description, a case has been described where the plurality of digital broadcasts in the present invention are a satellite digital broadcast and a terrestrial digital broadcast. It goes without saying that it can be applied.
[0060]
【The invention's effect】
As described above, the present invention is a digital broadcast receiving apparatus capable of selecting and receiving any one digital broadcast from a plurality of digital broadcasts. Even when a viewer switches channels while also switching the digital broadcast format, It is not necessary to select a program after extracting the additional information (EPG) after switching. For this reason, it is possible to reduce the time for searching for a program or switching channels after switching the system.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a digital broadcast receiving apparatus according to Embodiment 1 of the present invention.
FIG. 2 is a diagram showing an example of electronic program guide information.
FIG. 3 is a block diagram showing an example of the inside of a selection control unit in FIG. 1;
FIG. 4 is a flowchart showing an operation of the digital broadcast receiving apparatus when a viewer's selection is a satellite digital broadcast program.
FIG. 5 is a flowchart showing an operation of the digital broadcast receiving apparatus when a viewer's selection is a terrestrial digital broadcast program.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Satellite antenna, 2, 12 Front side receiving circuit, 3, 13 Tuner part, 4, 14 Demodulation part, 5, 15 De-scrambler part, 6, 16 De-multiplexer part, 11 Terrestrial antenna, 21 Selection control part 31 audio signal decoding unit, 32 audio control unit, 41 video signal decoding unit, 42 video control unit, 51 auxiliary information (EPG) decoding unit, 61 (non-volatile) storage unit, 71 receiving device control unit, 81 internal bus.

Claims (9)

A digital broadcast of an arbitrary system is selected from the digital broadcasts of a plurality of formats, and a transport / video signal packet of a plurality of channels, a packet of an audio signal, and a packet of ancillary information multiplexed on the digital broadcast of the format are selected. A digital broadcast receiving device capable of decoding a stream,
A tuner unit, a demodulation unit, a descrambler unit, and a front-side receiving circuit including a demultiplexer unit are individually formed for each reception path of each digital broadcasting system,
A transport control unit that receives a transport stream from each of the front-side receiving circuits, detects a packet of the additional information from the transport stream, and switches an output destination of each packet based on the detection result;
An additional information decoding unit that decodes the packet of the additional information;
A storage unit for storing the contents of the decrypted attached information,
The selection control unit outputs a packet of the detected additional information to the additional information decoding unit,
The digital broadcast receiving device, wherein the attached information decoding unit stores the decoded attached information in the storage unit. A video signal decoding unit for decoding a video signal packet;
An audio signal decoding unit for decoding a packet of the audio signal,
The selection control unit,
Detecting the video signal of the selected digital broadcasting system and the selected channel and outputting the video signal to the video signal decoding unit;
Detecting the audio signal of the selected digital broadcasting system and the selected channel and outputting the detected audio signal to the audio signal decoding unit;
In addition to the packet of the auxiliary information of the selected digital broadcasting system, also outputs the packet of the auxiliary information of the digital broadcasting system that is not selected to the auxiliary information decoding unit,
The digital broadcast receiving apparatus according to claim 1, wherein the additional information decoding unit stores at least the decoded additional information of the unselected digital broadcast system in the storage unit. The selection control unit,
3. The digital broadcast receiving apparatus according to claim 1, wherein a transport stream input from the front-side receiving circuit is detected for each system and an output destination is switched in an asynchronous manner. In the case where the digital broadcasting system needs to select a channel to be received from a plurality of channels in order to acquire additional information,
The selection control unit,
The packet output to the video signal decoding unit and the packet output to the audio signal decoding unit are of the selected digital broadcasting system and the selected channel,
Packets to be output to the auxiliary information decoding unit are sequentially demultiplexed by a demultiplexer unit in the front-side receiving circuit of the digital broadcasting system in which it is necessary to select the reception channel. The digital broadcast receiving device according to claim 2, wherein additional information is acquired. If the auxiliary information is of a type that does not need to be decrypted immediately,
The selection control unit,
The packet according to any one of claims 1 to 4, wherein the packet of the attached information before decoding is temporarily stored in the storage unit, and is read again and output to the attached information decoding unit when the packet is accumulated in a predetermined amount or more. Digital broadcast receiver. The selection control unit,
Selecting and outputting at least a packet of the electronic program guide information from the attached information,
The digital broadcast receiving device according to claim 1, wherein the attached information decoding unit decodes at least a packet of electronic program guide information from the attached information and stores the packet in the storage unit. . The digital broadcast receiver according to claim 1, wherein the storage unit that stores the content of the attached information is a nonvolatile storage circuit. A digital broadcast of an arbitrary system is selected from the digital broadcasts of a plurality of formats, and a transport / video signal packet of a plurality of channels, a packet of an audio signal, and a packet of ancillary information multiplexed on the digital broadcast of the format are selected. Streams can be received on individual receiving paths for each digital broadcasting system, and packets of each transport stream are detected, and the packets of the auxiliary information are not limited to channels of video and audio signal packets. A receiving method of a digital broadcast receiving device for decoding and storing,
Selecting a digital broadcast format and channel selected by the viewer;
Selecting, from the transport stream, a packet of ancillary information of an unselected digital broadcast system and channel in addition to the digital broadcast system and channel selected by the viewer;
A receiving method for a digital broadcast receiving apparatus, comprising a step of acquiring, in a background process, all ancillary information of a digital broadcasting scheme not selected in addition to a currently selected digital broadcasting scheme. In the case where the digital broadcasting system needs to select a channel to be received from a plurality of channels in order to acquire additional information,
In the step of acquiring additional information by background processing, the digital broadcast receiving apparatus obtains additional information of all channels by background processing by sequentially selecting non-selected channels of the digital broadcasting system.

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