JP4263510B2 - Digital broadcast receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital broadcast receiving apparatus that simultaneously demodulates a plurality of transport streams for providing different services and accurately acquires service information of each service.
[0002]
[Prior art]
In recent years, television broadcasting has been digitized, multi-channel broadcasting has been performed, and service information transmitted from a broadcasting station is extracted and analyzed by a digital broadcasting receiver, thereby allowing viewing of a specific channel and electronic program guide (EPG: Electronic). Programming Guide) and the like are provided.
[0003]
The format of digital broadcasting is standardized by ISO / IEC13818-1, "Program arrangement information used for digital broadcasting" (ARIB STDB-10) which is a standard of the radio industry. Multi-channeling is to multiplex a plurality of channels and service information in one band, and is realized by using, for example, a transport stream (hereinafter referred to as “TS”) in the MPEG2 (Moving Picture Experts Group 2) system standard. Is done.
[0004]
In general, in digital broadcasting, a TS is transmitted for each broadcaster, and a service composed of programs arranged in time series is packetized and multiplexed on the TS. In one TS, in addition to audio streams and video streams of a plurality of services, packets such as various information related to services are multiplexed.
[0005]
In ARIB STD B-10, an event information table (EIT: Event Information Table; hereinafter referred to as “EIT”) describing information relating to a program, and a service description table (SDT: describing a service in which programs are arranged in time series). Service information such as “Service Description Table (hereinafter referred to as“ SDT ”)” is defined. Specifically, the channel identifier, the broadcast start time of the program, the broadcast time, the program identifier, the program title, the program component information, etc. are described in the EIT, and the organization channel name, the consigned broadcaster name, etc. in the SDT Etc. are described.
[0006]
The service information is transmitted from the broadcasting station at a predetermined time interval, and is updated as needed when the program organization is changed. For example, with regard to EPG, the receiving apparatus analyzes information described in the service information, and displays programs scheduled to be broadcast in the future for a specific service on a time axis. In addition, when a viewer selects a program displayed on the EPG, a program recording reservation or a viewing reservation can be made.
[0007]
The EIT includes P / F EIT (present / following EIT) and schedule information (schedule EIT). In the P / F EIT, an EIT in which information related to a program currently being broadcast is described and an EIT in which information related to a program scheduled to be broadcast is described as a set. Information is described. In the schedule information, a long-term program broadcast schedule is described in a format in which program information is arranged in time series.
[0008]
The contents of the P / F EIT are changed every time the current broadcast ends in accordance with the broadcast schedule. In actual broadcasting, the contents of the P / F EIT are also changed in accordance with the program to be broadcast even when the program is extended by a live sports broadcast or the program is interrupted by an emergency special number.
[0009]
In order for the receiving apparatus to reliably present service information and make a recording reservation, it is important to accurately detect changes in the service information and update the service information correctly. Here, the service information related to a certain service includes in-stream service information included in a TS to which the service belongs and out-stream service information included in a TS to which the service does not belong. When the service information is changed at the broadcasting station, the service information in the stream is changed in a relatively short time following the service information. On the other hand, the service information outside the stream is changed with a delay of about one minute at most from the change of the service information in the stream due to a delay caused by transmission between broadcasting stations. In P / F EIT, in-stream service information is called actual P / F EIT, and out-of-stream service information is called other P / F EIT. In SDT, in-stream service information is called actual SDT and out-of-stream service information is called other SDT. be called.
[0010]
FIG. 9 is a block diagram showing a configuration of a conventional digital broadcast receiving apparatus 100. Below, the outline | summary of the service information update process in the conventional digital broadcast receiver 100 is demonstrated using FIG.
[0011]
In FIG. 9, an antenna 101 receives a radio wave transmitted from a broadcasting station. The tuner 102 selects radio waves in a predetermined frequency band from radio waves received by the antenna 101, performs analog-digital conversion, digital demodulation such as QPSK (Quadrature Phase Shift Keying), and error correction processing, and selects them. Demodulate a digital signal TS from radio waves in the frequency band. The TS decoder 104 extracts a series of information in units of sections such as EIT from the TS demodulated by the tuner 102, writes it to the EIT reception memory 121, and notifies the CPU 130 of reception of EIT by an interrupt or the like.
[0012]
The CPU 130 controls the operation of the entire receiving device. The remote control operation unit 117 outputs an Ir (Infra red) signal in accordance with an operation command input from the user. The Ir receiving unit 116 receives the Ir signal output from the remote control operation unit 117 and notifies the CPU 130 of the content.
[0013]
The EIT reception memory 121 stores the EIT extracted by the TS decoder 104. The service information storage memory 124 stores the latest service information for each service included in the entire network. The service information management memory 125 stores information on each service, for example, the TS to which the service belongs. The VRAM 215 stores a screen image generated by the CPU 130 based on service information stored in the service information storage memory 124.
[0014]
The TS decoder 104 extracts an audio stream and a video stream from the TS demodulated by the tuner 102. The audio decoder 110 reproduces audio from the audio stream extracted by the TS decoder 104. The speaker 112 outputs the sound reproduced by the sound decoder 110. The video decoder 111 reproduces video from the video stream extracted by the TS decoder 104. The OSD screen synthesizer 114 synthesizes the screen image written in the VRAM 115 and the video reproduced by the video decoder 111. The monitor 113 outputs the result synthesized by the OSD screen synthesizer 114.
[0015]
FIG. 10 is a diagram illustrating an example of digital broadcasting in which four services are provided by two TSs. There are two transport streams TS-A and TS-B having transport stream identifiers (TS_ID) 4010 and 4020, respectively, in a network having a network identifier (NETWORK_ID) of n5. Two types of services ch101 and ch102 with service identifiers (SERVICE_ID) of 101 and 102 belong to TS-A, and two types of services ch103 with service identifiers of 103 and 104 belong to TS-B, respectively. ch104 belongs to.
[0016]
FIG. 11 is a diagram showing EITs included in TS-A and TS-B in this network. The conventional digital broadcast receiving apparatus 100 can extract the actual P / F EIT of ch101 and ch102 and the other P / F EIT of ch111 and ch112 by demodulating TS-A. Further, by demodulating TS-B, the actual P / F EIT of ch111 and ch112 and the other P / F EIT of ch101 and ch102 can be extracted.
[0017]
FIG. 12 is a diagram showing a modification example of the program organization of ch101 in the broadcasting station. Table 151 shows the program organization before the change, and table 152 shows the program organization after the change. Before the change, the program event-1 was broadcast from 7:00, the program event-2 was broadcast from 8:00, and the program event-3 was broadcast from 9:00. On the other hand, after the change, the program event-1 is broadcast from 7:00, the program event-2 is broadcast from 8:30, and the program event-3 is broadcast from 9:30.
[0018]
FIG. 13 is a diagram showing how the transmitted P / F EIT changes with time when the program change as shown in FIG. 12 is performed. The P / F EIT 161 is the program event-1 being broadcast and the P / F EIT before the program change, and the P / F EIT 162 is the program event-1 being broadcast and the change is made The P / F EIT is a P / F EIT after a change is made while the program event-2 is being broadcast. A version is assigned to the P / F EIT, but the version is not common between the case where the P / F EIT is sent and the case where the other P / F EIT is sent. This is because, in general, the transmission period and change frequency are different between the actual P / F EIT and the other P / F EIT.
[0019]
FIG. 14 is a diagram illustrating an example in which the actual P / F EIT and the other P / F EIT transmitted from the broadcasting station are changed in time series. The change of the other P / F EIT is delayed from the change of the actual P / F EIT due to the convenience of the sending facility. For example, in the example shown in FIG. 14, when the actual P / F EIT for ch101 included in TS-A is changed to 7:55, the other P / F EIT for ch101 included in TS-B. Is changed at 7: 55 + α (α is about 0 to 60 seconds).
[0020]
As shown in FIG. 9, the conventional apparatus that demodulates only one TS at a time is either the actual P / F EIT or the other P / F EIT every time the P / F EIT is extracted from the demodulated TS. Regardless of whether it was remembered from time to time. Even if such a method is adopted, in the conventional apparatus, it has not been a problem whether the extracted P / F EIT is the one before the change or the one after the update.
[0021]
By the way, regarding a digital broadcast receiving apparatus, an apparatus that simultaneously demodulates a plurality of TSs is known (Patent Document 1). Since this apparatus simultaneously demodulates a plurality of TSs, two types of service information of actual P / F EIT and other P / F EIT can be separately extracted from each TS. In this apparatus, even after service information is changed at a broadcasting station and the actual P / F EIT after the change is received, the other P / F EIT before the change may be received.
[0022]
[Patent Document 1]
JP 2001-78156 A
[0023]
[Problems to be solved by the invention]
In a digital broadcast receiving apparatus that can simultaneously demodulate a plurality of TSs, a situation occurs in which the actual P / F EIT before the change is extracted after the actual P / F EIT after the change is extracted. However, it has not been clarified in the past how to update the service information in such an apparatus. Here, as with a digital broadcast receiving apparatus that demodulates only one TS at a time, if the P / F EIT extracted from the demodulated TS is stored as needed, the latest extracted from the TS to which the service currently being viewed belongs. The actual P / F EIT may be overwritten by an old other P / F EIT extracted from another TS. In this case, control such as presentation of service information and recording reservation becomes inaccurate.
[0024]
Therefore, an object of the present invention is to provide a digital broadcast receiving apparatus that can always obtain the latest service information even when service information is extracted by demodulating a plurality of TSs simultaneously.
[0025]
[Means for Solving the Problems and Effects of the Invention]
Book The invention is a digital broadcast receiving apparatus that simultaneously demodulates a plurality of transport streams from a received digital broadcast and obtains service information periodically included in each transport stream, the receiving means for receiving the digital broadcast, Demodulating means for demodulating a plurality of arbitrarily selected transport streams from the received digital broadcast, intra-stream service information, which is service information related to services included in the transport stream, from each transport stream, and the transport Extraction means for extracting service information outside the stream, which is service information related to services included in the transport stream other than the port stream, and a service for storing the latest service information for each service included in the transport stream And an information storage means, The demodulator storage means for storing which transport stream the demodulator is currently demodulating, and the out-stream service information relating to the service in which the extraction means is provided are extracted, and the in-stream service information relating to the service is stored in the service information storage means Is stored, and based on the information stored in the demodulation target storage means, it is determined that the demodulation means is currently demodulating the transport stream including the service, the service information storage means Only if the stored service information about the service is not updated with new in-stream service information within the first predetermined time period, Service information updating means for performing update processing for updating service information stored in the service information storage means using the service information extracted by the extracting means.
[0026]
Book According to the invention, with respect to a certain service, the service information update unit determines whether or not to update based on a predetermined determination criterion when updating the service information stored in the service information storage unit with the extracted service information. . for that reason, Of the present invention Digital broadcast receiver According to , Regarding the service belonging to the TS to be demodulated, even if the latest service information is not stored in the service information storage unit, the service information update unit can extract the in-stream service information within a predetermined time period and extract the latest in-stream information. Accurate service information presentation and recording reservation can be controlled by the service information. Further, the service information update means obtains the service information necessary for recording reservation, etc., to acquire the service information outside the stream and present the service information even if the service information in the stream cannot be extracted for some reason within a predetermined time. And recording reservations can be controlled. Thus, according to the present invention, The latest service information can be stored in the service information storage means. As a result, it is possible to control accurate presentation of service information and recording reservation.
[0029]
Also book invention In Service information updating means extracts out-of-stream service information relating to a service in which the extracting means is present; in-stream service information relating to the service is stored in the service information storage means; and information stored in the demodulation target storage means If the demodulation means determines that the transport stream including the service is not currently demodulated based on the service information storage means, the second predetermined time after the in-stream service information related to the service is stored in the service information storage means The update process is performed only when the period has elapsed.
[0030]
Book According to the invention, for a certain service belonging to a TS that is not demodulated, when a predetermined time has not passed since the service information stored in the service information storage means was previously updated by the service information in the stream, Since the extracted out-of-stream service information may not reflect the change of the in-stream service information, the service information update unit waits for a predetermined time. Therefore, the service information update unit can prevent the new in-stream service information from being rewritten with the old out-of-stream service information, and can store the latest service information in the service information storage unit. As a result, it is possible to control accurate presentation of service information and recording reservation.
[0031]
Also book invention In The service information update means extracts in-stream service information related to the service for which there is an extraction means. Taba In this case, update processing is performed to extract out-of-stream service information related to the service with the extraction means, and the in-stream service information related to the service is stored in the service information storage means and stored in the demodulation target storage means On the basis of the received information, it is determined that the demodulation means is currently demodulating the transport stream including the service. Place Do not perform the update process , Extraction Out-stream service information related to a service with an output means is extracted, and in-stream service information related to the service is not stored in the service information storage means, and the demodulation means based on the information stored in the demodulation target storage means Is not currently demodulating the transport stream containing the service. Place In this case, an update process is performed.
[0032]
The book described above According to the invention, when the latest in-stream service information regarding a certain service is extracted, the service information in the service information storage unit is always updated, and when the service information outside the stream that is not necessarily the latest is extracted, Digital broadcasting is provided by setting criteria for determining whether a TS to which the service belongs is a demodulation target, whether a predetermined time has elapsed, and what type of service information is stored in the service information storage means. The receiving apparatus can prevent the new in-stream service information from being rewritten with the old out-of-stream service information, and can store the latest service information in the service information storage means. As a result, it is possible to control accurate presentation of service information and recording reservation.
[0038]
As explained above, the book According to the invention, the digital broadcast receiving apparatus can store the latest event information table, service description table, and schedule information in the service information storage means. As a result, it is possible to control accurate presentation of service information and recording reservation.
[0039]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving apparatus 200 according to the embodiment of the present invention. The digital broadcast receiving apparatus 200 has a function of simultaneously demodulating a plurality of TSs and simultaneously recording other programs in addition to the program being viewed. In FIG. 1, an antenna 201 receives a radio wave transmitted from a broadcasting station. The tuners 202 and 203 select radio waves in a predetermined frequency band from the radio waves received by the antenna 201, perform analog-digital conversion, digital demodulation such as QPSK, and error correction processing, and select each frequency selected. Demodulate the digital signal TS from the radio wave. The TS decoders 204 and 205 respectively extract a series of information in units of sections such as EIT from the TS demodulated by the tuners 202 and 203, write them to the EIT reception memories 221 and 222, and receive the EIT to the CPU 230. Notify by interruption.
[0040]
The CPU 230 controls the operation of the entire receiving device. The remote control operation unit 217 outputs an Ir signal in accordance with an operation command input from the user. The Ir receiving unit 216 receives the Ir signal output from the remote control operation unit 217 and notifies the CPU 230 of the content.
[0041]
EIT reception memories 221 and 222 store the EIT extracted by TS decoders 204 and 205, respectively. The service information storage memory 224 stores the latest service information for each service included in the entire network. The EIT temporary storage memory 223 temporarily stores the other P / F EIT extracted by the TS decoders 204 and 205. The service information management memory 225 stores information related to each service. The demodulation target memory 226 stores information (for example, an identifier, a name, and the like) for identifying the TS currently being demodulated by the TS decoders 204 and 205. The VRAM 215 stores the OSD screen image generated by the CPU 230 based on the service information described in the service information storage memory 224.
[0042]
The timer 231 is a timer in units of 1 second, for example. The time information memory 227 stores a retransmission waiting time t1 and a change reflection time t2 for each service. Details of the retransmission waiting time t1 and the change reflection time t2 will be described later.
[0043]
The TS decoder 204 extracts an audio stream and a video stream from the TS demodulated by the tuner 202. The audio decoder 210 reproduces audio from the audio stream extracted by the TS decoder 204. The speaker 212 outputs the sound reproduced by the sound decoder 210. The video decoder 211 reproduces video from the video stream extracted by the TS decoder 204. The OSD screen synthesizer 214 synthesizes the screen image written in the VRAM 215 and the video reproduced by the video decoder 211. The monitor 213 outputs the result synthesized by the OSD screen synthesizer 214.
[0044]
FIG. 2 illustrates the contents of the EIT temporary storage memory 223. The EIT temporary storage memory 223 stores a service name and another P / F EIT for each service. In the example of FIG. 2, the other P / F EIT relating to the service ch 111 extracted from TS-A is temporarily stored.
[0045]
FIG. 3 illustrates the contents of the service information storage memory 224. The service information storage memory 224 stores the extracted P / F EIT itself and the update time for each service. The P / F EIT includes a type indicating whether it is an actual P / F EIT or another P / F EIT, a service name, a TS name, and version information.
[0046]
FIG. 4 illustrates the contents of the service information management memory 225. The service information management memory 225 stores a correspondence relationship between a network name, a TS name, and a service name. For example, the service ch 101 belongs to TS-A of the network n5.
[0047]
FIG. 5 illustrates the contents of the demodulation target memory 226. In the demodulation target memory 226, the service name and whether or not the actual P / F EIT has already been stored in the service information storage memory 224 for the service belonging to the TS to be demodulated by the TS decoder 204 or 205. The actual storage flag shown is stored. The actual storage flag is newly unstored every time the TS to which each service belongs becomes a demodulation target, and then stored when the actual P / F EIT is stored in the service information storage memory 224. In the example of FIG. 5, among three TSs (TS-A, TS-B, and TS-C), TS-A and TS-B are targeted for demodulation. The services included in the TS to be demodulated are ch101, ch102, ch111, and ch112. Of these, the actual P / F EIT of ch 101, ch 102, and ch 103 is stored in the service information storage memory 224, but the actual P / F EIT of ch 111 is not stored in the service information storage memory 224.
[0048]
FIG. 6 illustrates the contents of the time information memory 227. The time information memory 227 stores a service name, a retransmission waiting time t1, and a change reflection time t2. In the example of FIG. 6, the retransmission waiting time t1 for each service is all 3 seconds, and the change reflection times t2 are all 60 seconds.
[0049]
When the digital broadcast receiving apparatus 200 extracts the P / F EIT related to a certain service (hereinafter referred to as “service A”), first, whether the extracted P / F EIT is the actual P / F EIT (hereinafter referred to as the first P / F EIT). 1) and other P / F EIT. In the latter case, the digital broadcast receiving apparatus 200 further determines whether or not the actual P / F EIT related to the service A is stored in the service information storage memory 224 (hereinafter referred to as condition P), and the TS to which the service A belongs The case is divided into four cases depending on whether or not the current demodulation is performed (hereinafter referred to as condition Q). Hereinafter, the case where the conditions P and Q are true is the second case, the case where the condition P is false and the condition Q is true is the third case, the case where the condition P is true and the condition Q is false is the fourth. In this case, the case where the conditions P and Q are false is referred to as a fifth case. The digital broadcast receiving apparatus 200 performs the following processing for the above five cases.
[0050]
(First case)
In the broadcasting station, when the actual P / F EIT is changed with respect to the service A, the other P / F EIT is extracted later because the other P / F EIT is changed later. Same content or newer than actual P / F EIT and other P / F EIT.
[0051]
Therefore, when the digital broadcast receiving apparatus 200 according to the present embodiment extracts the actual P / F EIT for the service A, the digital broadcast receiving apparatus 200 determines that the EIT is always the latest and stores it in the service information storage memory 224. Update the P / F EIT for service A.
[0052]
In the second to fifth cases, when the digital broadcast receiving apparatus 200 extracts the other P / F EIT related to the service A, the P / F EIT for the service A stored in the service information storage memory 224 is unconditionally set. Updating with may cause problems. In other words, when the changed actual P / F EIT is already stored in the service information storage memory 224, if the digital broadcast receiving apparatus 200 overwrites this with the old other P / F EIT, the old P / F EIT Recording reservations are made based on the EIT. Therefore, the digital broadcast receiving apparatus 200 uses the extracted other P / F EIT to store the service A stored in the service information storage memory 224 in the second to fifth cases so that an accurate recording reservation can be made. It is determined whether or not to update the P / F EIT for, and update processing is performed according to the determination result.
[0053]
(Second case)
The second case is a case where the digital broadcast receiving apparatus 200 extracts the other P / F EIT and the actual P / F EIT is already stored in the service information storage memory 224 for the service A to be demodulated. . In this case, since the digital broadcast receiving apparatus 200 can use the latest stored actual P / F EIT for recording reservation or the like, the extracted other P / F EIT is unnecessary. Therefore, the digital broadcast receiving apparatus 200 discards the extracted other P / F EIT.
[0054]
(Third case)
The third case is a case where the digital broadcast receiving apparatus 200 extracts the other P / F EIT for the service A to be demodulated and the actual P / F EIT is not stored in the service information storage memory 224.
[0055]
Since the actual P / F EIT is periodically transmitted, the digital broadcast receiving apparatus 200 can normally extract the actual P / F EIT within the time corresponding to the transmission period. Therefore, in principle, the digital broadcast receiving apparatus 200 does not need to update the P / F EIT related to the service A stored in the service information storage memory 224 with the extracted other P / F EIT. However, there is a possibility that the digital broadcast receiving apparatus 200 cannot extract the actual P / F EIT in the future for some reason. In consideration of this point, the digital broadcast receiving apparatus 200 holds the extracted other P / F EIT, and if the actual P / F EIT cannot be extracted thereafter, the held other P / F EIT can be used. desirable.
[0056]
Accordingly, in the third case, the digital broadcast receiving apparatus 200 writes the other P / F EIT to the EIT temporary storage memory 223, and a time longer than the cycle in which the actual P / F EIT is transmitted (retransmission waiting time t1) has elapsed. Even if the actual P / F EIT cannot be extracted, the P / F EIT for the service A in the service information storage memory 224 is updated with the previously extracted other P / F EIT.
[0057]
(4th case)
The fourth case is a case where another P / F EIT is newly extracted for the service A that is not a demodulation target, and the actual P / F EIT is stored in the service information storage memory 224.
[0058]
If the TS to which the service A belongs is not to be demodulated, the service information storage memory 224 often stores the other P / F EIT. However, immediately after service A is no longer subject to demodulation, the actual P / F EIT of service A may already be stored in the service information storage memory 224, so the fourth case may also occur.
[0059]
In general, it takes a certain amount of time after the actual P / F EIT is changed at the broadcasting station until the change is reflected in the other P / F EIT. Therefore, for service A, if sufficient time has elapsed since the actual P / F EIT was stored in the service information storage memory 224, the extracted other P / F EIT is stored in the stored actual P / F EIT. Newer than that. On the other hand, if sufficient time has not elapsed, the stored actual P / F EIT is newer than the extracted other P / F EIT.
[0060]
Therefore, in the fourth case, the digital broadcast receiving apparatus 200 can determine the P for the service A stored in the service information storage memory 224 with the extracted other P / F EIT only when a predetermined time has elapsed. / F EIT is updated, and if the predetermined time has not elapsed, the extracted other P / F EIT is discarded.
[0061]
In order to perform the process in the fourth case, the digital broadcast receiving apparatus 200 includes ,Ah The change reflection time t2 is stored in the time information memory 227 as a predetermined time. In general, in digital broadcasting, after service information is changed at a broadcasting station, it takes about 30 seconds at maximum from the change of actual P / F EIT to the change of other P / F EIT. Accordingly, the change reflection time t2 is preferably longer than 30 seconds, and is preferably about 60 seconds in view of a system design margin, for example.
[0062]
(5th case)
The fifth case is a case where the other P / F EIT is newly extracted for the service A that is not demodulated, and the other P / F EIT is stored in the service information storage memory 224.
[0063]
In general, after a broadcast station changes the actual P / F EIT, the time until the change is reflected in the other P / F EIT is not greatly different regardless of which other P / F EIT is included in which TS. Therefore, there is no problem even if it is determined that the newly extracted other P / F EIT is the latest.
[0064]
Therefore, in the fifth case, the digital broadcast receiving apparatus 200 updates the P / F EIT for the service A stored in the service information storage memory 224 with the extracted other P / F EIT.
[0065]
FIG. 7 is a flowchart showing processing for updating the service information storage memory 224 in the digital broadcast receiving apparatus 200 according to the present embodiment. Hereinafter, processing from when the P / FEIT is taken out from the EIT reception memory 221 or 222 until it is stored in the service information storage memory 224 will be described with reference to the flowchart of FIG. This process is executed by the CPU 230 that has received an EIT reception interrupt from the TS decoder 204.
[0066]
When the CPU 230 receives the EIT reception interrupt, the CPU 230 extracts the P / F EIT newly extracted by the TS decoder 204 from the EIT reception memory 221 as the processing target P / F EIT, and is described in the processing target P / F EIT. A service is specified based on the service identifier (step S21). Hereinafter, this service is referred to as service A. Next, the CPU 230 determines whether the P / F EIT to be processed is actual P / F EIT or other P / F EIT (step S22).
[0067]
When it is determined in step S22 that the P / F EIT to be processed is the actual P / F EIT, the CPU 230 determines that the other P / F EIT related to the service A is stored in the EIT temporary storage memory 223. Is discarded (step S23). Next, the CPU 230 updates the contents of the service information storage memory 224 with the P / F EIT to be processed (that is, the extracted P / F EIT) (step S24). That is, the CPU 230 writes the P / F EIT to be processed in the service information storage memory 224 as the latest EIT related to the service A. As a result, as illustrated in FIG. 3, P / F EIT information for one service is written in the service information storage memory 224. Next, the CPU 230 writes the update time in the service information storage memory 224 (step S25). Thus, in FIG. 3, the time is written in the update time column for one service.
[0068]
If it is determined in step S22 that the P / F EIT to be processed is the other P / F EIT, the CPU 230 obtains the TS to which the service A belongs based on the information stored in the service information management memory 225 (step S22). S27). Next, based on the information stored in the demodulation target memory 226, the CPU 230 determines whether or not the TS obtained in step S27 is currently the demodulation target (step S28).
[0069]
If it is determined in step S28 that the data is to be demodulated, the CPU 230 determines whether the actual P / F EIT for the service A has been stored in the service information storage memory 224 based on the actual storage flag stored in the demodulation target memory 226. It is determined whether it is a memory (step S29). If it is determined in step S29 that the data has been stored, the CPU 230 discards the EIT to be processed (step S30) and ends the update process. When determining in step S29 that the data is not stored, the CPU 230 writes the EIT to be processed in the EIT temporary storage memory 223 (step S31). Next, the CPU 230 refers to the time information memory 227, sets the retransmission waiting time t1 of the service A to the timer 231 (step S32), and ends this update process.
[0070]
If it is determined in step S28 that it is not a demodulation target, the CPU 230 determines whether the P / F EIT for the service A already stored in the service information storage memory 224 is actual P / F EIT or other P / F EIT. (Step S33).
[0071]
If it is determined in step S33 that the stored P / F EIT is the other P / F EIT, the CPU 230 proceeds to step S24 and performs the same processing as when the actual P / F EIT is extracted. If it is determined in step S33 that the stored P / F EIT is the actual P / F EIT, the CPU 230 refers to the update time of the service information storage memory 224 and the time information memory 227, and determines the actual P It is determined whether or not the change reflection time t2 has elapsed since / F EIT was stored (step S34). If it is determined in step S34 that the change reflection time t2 has elapsed, the CPU 230 proceeds to step S24 and performs the same processing as when the actual P / F EIT is extracted. When determining in step S34 that the change reflection time t2 has not elapsed, the CPU 230 proceeds to step S30 and discards the extracted P / F EIT (step S30).
[0072]
FIG. 8 is a flowchart showing a timeout process when the timer 231 set in step S32 notifies the CPU 230 of a timeout. Hereinafter, the timeout process by the CPU 230 will be described with reference to FIG. When the time set in the timer 231 elapses, the timer 231 notifies the CPU 230 of a timeout, and the CPU 230 starts a timeout process described below.
[0073]
The CPU 230 determines whether the other P / F EIT of the service for which the timer has been set (hereinafter referred to as “service B”) is stored in the EIT temporary storage memory 223 (step S41). If it is determined in step S41 that the other P / F EIT is stored, the CPU 230 uses the other P / F EIT for the service B stored in the EIT temporary storage memory 223 to store the service P / F EIT in the service information storage memory 224. The stored P / F EIT for service B is updated (step S42). Next, the CPU 230 discards the other P / F EIT for the service B stored in the EIT temporary storage memory 223 (step S43). Next, the CPU 230 writes the update time in the service information storage memory 224 (step S44).
[0074]
As described above, according to the digital broadcast receiving apparatus 200 according to the present embodiment, the P / F extracted from the TS according to the predetermined judgment standard defined between the actual P / F EIT and the other P / F EIT. Using the F EIT, an update process for updating the P / F EIT stored in the service information storage memory 224 is performed. Thereby, even when other P / F EIT updated later than the actual P / F EIT is received, the state where the latest P / F EIT is stored in the service information storage memory 224 can be maintained. Therefore, even when the program organization is changed at the broadcasting station, accurate recording reservation and viewing reservation using EPG are possible based on the latest P / F EIT.
[0075]
Note that, as in the present embodiment, the situation where the service information outside the stream is updated later than the service information within the stream occurs not only in P / F EIT but also in SDT and schedule EIT. Therefore, the same method as that of the digital broadcast receiving apparatus 200 according to the present embodiment can be applied to these pieces of information. The P / F EIT is described for each service, but the schedule information is not always described for each service. Accordingly, the P / F EIT update time may be stored for each service in the service information storage memory 224 or may be stored for each service in the service information management memory 225. In contrast, the update time of the schedule information is preferably stored in the service information storage memory 224 for each schedule information.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram showing an example of contents of an EIT temporary storage memory in the digital broadcast receiving apparatus according to the embodiment of the present invention.
FIG. 3 is a view showing an example of the contents of a service information storage memory in the digital broadcast receiving apparatus according to the embodiment of the present invention.
FIG. 4 is a view showing an example of the contents of a service information management memory in the digital broadcast receiving apparatus according to the embodiment of the present invention.
FIG. 5 is a view showing an example of contents of a demodulation target memory in the digital broadcast receiving apparatus according to the embodiment of the present invention;
FIG. 6 is a diagram showing an example of contents of a time information memory in the digital broadcast receiving apparatus according to the embodiment of the present invention.
FIG. 7 is a flowchart showing processing for updating a service information storage memory in the digital broadcast receiving apparatus according to the embodiment of the present invention.
FIG. 8 is a flowchart showing timeout processing in the digital broadcast receiving apparatus according to the embodiment of the present invention.
FIG. 9 is a block diagram showing a configuration of a conventional digital broadcast receiving apparatus.
FIG. 10 is a diagram illustrating an example of digital broadcasting in which four services are provided by two TSs.
11 is a diagram showing an EIT included in each TS in the network of FIG.
FIG. 12 is a diagram showing a modification example of program organization in a broadcasting station
13 is a diagram showing a part of the contents of the P / F EIT sent before and after the change according to FIG. 12;
FIG. 14 is a diagram illustrating an example in which actual P / F EIT and other P / F EIT transmitted from a broadcasting station are changed in time series.
[Explanation of symbols]
200: Digital broadcast receiver
201 ... antenna
202, 203 ... tuner
204, 205 ... TS decoder
210 ... Audio decoder
211 ... Video decoder
212 ... Speaker
213 ... Monitor
214 ... OSD screen synthesizer
215 ... VRAM
216... Ir receiver
217 ... Remote control operation unit
221, 222 ... EIT reception memory
223 ... EIT temporary storage memory
224 ... Service information storage memory
225 ... Service information management memory
226 ... Memory to be demodulated
227 Time information memory
230 ... CPU
231 ... Timer

Claims (3)

A digital broadcast receiver that simultaneously demodulates a plurality of transport streams from a received digital broadcast and obtains service information periodically included in each transport stream,
Receiving means for receiving digital broadcasting;
Demodulation means for demodulating a plurality of arbitrarily selected transport streams from the received digital broadcast;
From each of the transport streams, in-stream service information that is service information related to a service included in the transport stream, and out-stream service information that is service information related to a service included in a transport stream other than the transport stream. Extracting means for extracting;
Service information storage means for storing the latest service information for each service included in the transport stream;
Demodulation target storage means for storing which transport stream the demodulation means is currently demodulating;
Based on the information stored in the demodulation target storage means, the service information storage means does not store the in-stream service information related to the service, and the service information storage means If it is determined that the demodulating means is currently demodulating a transport stream including the service, the service information related to the service stored in the service information storage means is within a first predetermined time. Service information updating means for performing update processing for updating service information stored in the service information storage means using the service information extracted by the extraction means only when the service information is not updated with new service information in the stream. And a digital broadcast receiver. Before SL service information updating unit extracts a stream out of service information about the services that the extraction means, said and stream service information for the service is stored in the service information storage means, and said demodulation target storage means If it is determined that the demodulating means is not currently demodulating the transport stream including the service based on the information stored in the service information, the service information storage means stores in-stream service information related to the service. 2. The digital broadcast receiving apparatus according to claim 1, wherein the update process is performed only when a second predetermined time has elapsed since the first time. Before SL service information updating means, the extracted If the stream service information about the services that the extraction unit performs the updating process,
The extraction means extracts out-stream service information related to a service, the service information storage means stores in-stream service information related to the service, and based on the information stored in the demodulation target storage means, wherein the current If that will be determined that demodulates a transport stream including demodulating means the service, without the updating process,
Extract stream out of service information related to a certain previous Symbol extractor service, stream service information for the service is not stored in the service information storage means, and the information stored in the demodulated storage means based, wherein the case that will be determined that the current does not demodulate the transport stream including demodulating means for the service, and performs the update processing, the digital broadcast receiving apparatus according to claim 2.

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