JP4058830B2 - Digital signal receiving apparatus and receiving method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a digital signal receiving apparatus and a receiving method used when, for example, CS digital broadcasting is received and retransmitted via digital cable broadcasting.
[0002]
[Prior art]
In a CS (Communication Satellite) digital broadcast signal that provides services such as video, audio, or text data, the description of the service in the NIT (Network Information Table) is only related to the service currently being broadcast. Also, services described in the NIT but not described in the PAT and / or EIT are treated as being suspended by a receiver such as an STB (Set Top Box).
[0003]
[Problems to be solved by the invention]
When a CS digital broadcast is received and retransmitted via a digital cable broadcast, there may be a service described in the PAT and / or EIT but not in the NIT. Since such a state cannot be in CS digital broadcasting, there is a possibility that malfunction or operation delay may occur when processing similar to the conventional one is performed in STB or the like.
[0004]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a digital signal receiving apparatus and a receiving method capable of performing normal operation even when there are services described in PAT and / or EIT but not described in NIT. There is to do.
[0005]
[Means for Solving the Problems]
  The invention of claim 1 describes the relationship between physical information about a transmission path and data that can be provided.NITAnd a description of the data that can be provided.PAT and / or EITIn a receiver for receiving a digital broadcast signal having:
  PAT and / or EITSearch sequentially for the services described in
  Within the searched serviceNITCreate a list that contains only what is described in
  Based on the created listProcessing to display the contents of services that can be provided to viewersA digital signal receiver characterized byis there.
[0006]
  Claim3The invention describes the relationship between physical information about the transmission path and the data that can be providedNITAnd a description of the data that can be provided.PAT and / or EITIn a receiving method for receiving a digital broadcast signal having:
  PAT and / or EITA search step for sequentially searching for services described in 1.
  Within the services searched by the search stepNITA list creation step for creating a list in which only what is described in is described,
  Based on the created listProcessing to display the contents of services that can be provided to viewersA digital signal receiving method characterized in that
[0007]
According to the invention as described above, the physical information regarding the transmission path and the data to be viewed in the service described in the information table such as PAT and / or EIT in which the description regarding the data that can be viewed is made. A list describing only what is described in an information table such as NIT describing the relationship between the EPG and the EPG is generated, and processing such as EPG display can be performed based on the list.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An example of a digital signal transmission system that receives CS digital broadcast and retransmits it via digital cable broadcast is shown in FIG. The satellite 1 has a plurality of transponders (satellite repeaters). The antenna 2 receives digital broadcast signals respectively transmitted from these transponders. The modulation conversion unit 3 is supplied with the digital broadcast signal received by the antenna 2, changes the transmission frequency and modulation method of the supplied digital broadcast signal so as to be compatible with the cable digital broadcast, etc., and then sends it to the transmission line 4. . The transmission line 4 includes an STB 5₁, 5₂, ..., 5_mIs connected as a receiver. STB5₁, 5₂, ..., 5_mEach has a monitor 6₁, 6₂, ..., 6_mAre connected, and an image of the program number selected in each STB is displayed on each monitor.
[0009]
The digital broadcast signal will be described. Here, as an example, a digital broadcasting signal corresponding to a DVB (Digital Video Broadcasting) system as a European digital broadcasting standard will be described. FIG. 2 shows an example of a signal format in a multimedia multiplexing system based on TS (Transpot Stream) corresponding to MPEG (Moving Picture Experts Group) 2 specifications. The data of each medium constitutes a variable length packet called a PES (Packetized Elementary Streams) packet. The PES packet is further divided into several transport stream packets (hereinafter referred to as TS packets). A TS packet is composed of a header and a payload area.
[0010]
A detailed configuration of the TS packet corresponding to the MPEG2 standard will be described with reference to FIG. One packet is composed of 188 bytes, and among these, the first 4 bytes, that is, 32 bits are used as a packet header. Of the packet header, 1 byte, that is, 8 bits is a synchronization byte, and the decoder detects the head of the TS packet based on this synchronization byte. For example, '47H' (H is a hexadecimal meaning) is used as the sync byte pattern. Also, 1 bit is used as a transport error indicator that indicates the presence or absence of an error in the TS packet. One bit is used as a payload unit start indicator indicating that a new PES packet starts from this TS packet.
[0011]
One bit is used as a transport priority bit indicating the importance of the TS packet. Further, 13 bits are used as a PID (Packet Identifier) that is an identifier of the TS packet. The identification number of the TS packet stored in the PID indicates the attribute of the individual stream of the packet, and STB5₁~ 5_mEtc., the data of each medium is identified with reference to the PID. Also, 2 bits are used as transport / scramble control information indicating the presence / absence and type of the payload of the TS packet.
[0012]
Further, 2 bits are used as adaptation field control information indicating the presence / absence of an adaptation field in the TS packet and the presence / absence of a payload. Further, 4 bits are used as continuity index information for detecting whether or not a packet having the same PID is partially discarded in the middle. The presence / absence of such packet rejection is detected based on the continuity of the 4-bit cyclic count information.
[0013]
On the other hand, 184 bytes other than the packet header are used as the payload area. The payload area is used to store data that is viewed by the user such as video data and audio data, or PSI (Program Specific Information), SI (Service Information), etc., which will be described later, for each TS packet.
[0014]
Next, FIG. 4 shows a frame structure of digital broadcast data in the DVB system. FIG. 4A shows an MPEG2 TS packet. FIG. 4B shows a state where one frame is formed by collecting eight MPEG2 TS packets shown in FIG. 4A. Here, Reed-Solomon error correction code is added to the data in each TS packet, and one packet is 204 bytes. Further, the frame is synchronized by inverting the synchronization byte once per 8 packets. For example, when “47H” is used as the synchronization byte, the synchronization byte is set to “B8H” once per 8 packets. Digital broadcast data as shown in FIG. 4B is modulated by QPSK (Quadrarure Phase Shift Keying).
[0015]
Next, PSI will be described. Examples of PSI types include PAT (Program Association Table), PMT (Program Map Table), and NIT (Network Information Table). First, the PAT is an information table in which unique contents are multiplexed for each carrier. That is, PAT describes channel information in each carrier and PID of PMT (which will be described later) indicating the contents of each channel. An example of the data structure of the PAT is shown in FIG. The table ID (8 bits) indicates the type of the table, and the PAT is fixed to “0x0000” (“0x” indicates hexadecimal notation). The section syntax indicator (1 bit) indicates whether the header of the section is in a long form or a short form. Reserve (2 bits) indicates a flag to be assigned in the future.
[0016]
The section length (12 bits) indicates a section length in bytes from immediately after this to the end of the section (including a CRC (Cyclic Redandancy Code) code). TSID (16 bits) identifies a transport stream (multiplexed encoded data) and corresponds to a transponder in the case of a satellite. The version number (5 bits) represents the PAT version, and the version number is updated every time the contents of the PAT are updated. The current next indicator (1 bit) indicates which version of the PAT is transmitted when the old and new versions of the PAT are simultaneously transmitted. The section number (8 bits) represents a section number, and is set to “0x00” for the first section, and is incremented by 1 thereafter. The last section number (8 bits) represents the section number of the last section of the same sub-table.
[0017]
Further, a portion surrounded by a double line, that is, a program number (16 bits), a reserve (3 bits), a network PID (13 bits), and a program map (13 bits) are repeatedly written. The program number is a number for identifying each channel. The network PID indicates the PID of the subsequent NIT when the program number is “0x0000”. The program map PID indicates a PID corresponding to the PMT (which will be described later). CRC is an error detection code for the entire section.
[0018]
The PMT is an information table in which contents for each channel are multiplexed. That is, the PID of a packet in which a stream of video data, audio data, additional data, etc. constituting each channel is transmitted and the PID of an ECM (Encription Control Message) packet necessary for descrambling are described. The PID of the PMT is specified by the PAT as described above. FIG. 6 shows an example of the PMT data structure. Description of the data portion similar to that included in the data structure of the PAT described above with reference to FIG. 5 is omitted. The table ID (8 bits) indicates the type of the table, and the table ID = “0x02” is set for the PMT itself. PCR (Program Clock Reference: time recognition means reference reference value built in a program) PID (13 bits) indicates the PID of a packet including a clock serving as a reference for decoding. The program information length (12 bits) describes information common to this service in the immediately following loop. Descriptors are repeatedly written to describe information for each section in order to complement the section information.
[0019]
Furthermore, the part enclosed by double lines, that is, stream type (8 bits), reserve (3 bits), elementary PID (13 bits) reserve (4 bits), ES information length (12 bits), and descriptor are repeated. Written. Among these, the descriptor is repeated at each repetition. The program number is a number for identifying each channel. The stream type indicates the type of signal through which the stream is transmitted, such as video, audio, and data. Elementary PID indicates the PID of the elementary stream. The ES information length describes the information of the elementary stream in the immediately following loop.
[0020]
The NIT is an information table in which information for associating transmission path information and broadcasted services is described. That is, the NIT describes a list of channels multiplexed on each carrier together with physical information for each carrier, for example, satellite orbit, polarization, carrier frequency for each transponder, convolution rate, and the like. . The PID of the NIT is “0x0010”. The PAT and PMT described above are defined in detail in the data structure in the MPEG2 system, whereas only the necessity is defined in the NIT, and the data structure is private.
[0021]
An example of the data structure of the NIT is shown in FIG. The description of the data portion similar to the data portion in the data structure of the PAT and PMT described above with reference to FIGS. The table ID (8 bits) indicates the type of the table. The network is “0x40” and the other network is “0x41”. The network ID (16 bits) identifies a network and corresponds to an individual satellite in the case of a satellite. The network descriptor length (13 bits) describes common information of the network in the immediately following loop. The TS loop length lists the transport streams belonging to the network in the immediately following loop. Further, the TS descriptor length (12 bits) is written in the repeated portion surrounded by the double line. The TS descriptor length describes the information of the transport stream in the immediately following loop.
[0022]
Next, the satellite delivery system descriptor will be described with reference to FIG. The satellite delivery system descriptor is used as the first descriptor repeated according to the TS descriptor length (see FIG. 7), and makes a pair with the TSID. The descriptor tag (8 bits) is defined by DVB and indicates the type of descriptor. For the satellite delivery system descriptor, descriptor tag = '0x43'. The descriptor length (8 bits) indicates the data length of the descriptor. The digital frequency (32 bits) indicates the transmission frequency for each stream (here, transponder). Orbit (16 bits) indicates the longitude of the orbital position of the satellite.
[0023]
The west longitude / east longitude flag (1 bit) indicates the east longitude / west longitude of the orbital position of the satellite. Polarization (2 bits) indicates the polarization of the transmitted signal. For example, '00', '01', '10', and '11' can correspond to a horizontal straight line, a vertical straight line, a left-handed circle, and a right-handed circle, respectively. Modulation (5 bits) indicates a modulation method. For example, “00001” corresponds to QPSK. The symbol rate (23 bits) indicates the symbol rate. FEC (Forward Error Correction) (4 bits) indicates a convolution rate.
[0024]
Next, the service list descriptor will be described with reference to FIG. The service list descriptor is used as the second and subsequent descriptors repeated according to the TS descriptor length (see FIG. 7), and indicates the ID of the service (channel) multiplexed in the stream (here, transponder). That is, a service list descriptor is attached to one TSID. The descriptor tag (8 bits) is defined by DVB and indicates the type of descriptor. The descriptor tag for the service list descriptor is “0x41”.
[0025]
The service ID (16 bits) identifies the service. The service usually matches the channel that the viewer selects. The service type indicates the contents of the service such as video, audio, and data. That is, '0x01' corresponds to the digital TV service, '0x02' corresponds to the digital voice service, '0x03' corresponds to the teletext service, '0x04' corresponds to the NVOD basic service, etc., and also corresponds to user definition, reserve, etc. The code to do is also included.
[0026]
Next, the cable delivery system descriptor will be described with reference to FIG. Description of the data portion similar to the data portion in the data structure of the satellite delivery system descriptor described above with reference to FIG. 8 is omitted. The descriptor tag is defined by DVB and indicates the type of descriptor. The descriptor tag for the cable delivery system descriptor is “0x44”. The frequency (32 bits) indicates a transmission frequency for each stream in the cable digital broadcast (here, each channel in the cable digital broadcast).
[0027]
An FEC (Forward Error Correction) outer code (4 bits) is an error correcting code as an outer code. For example, when “0010” is set, a Reed-Solomon code is used as an outer code. Indicates. Modulation (8 bits) indicates a modulation method. For example, when “0x03” is set, it corresponds to 64QAM. The symbol rate (28 bits) indicates the symbol rate. The FEC code (4 bits) indicates the convolution rate.
[0028]
STB5 for selectively decoding channel data selected by the viewer₁~ 5_mThe processing in will be described with reference to FIG. Here, STB5₁The processing in is described as a representative example. In step S1, the viewer selects STB5₁The channel number “X” related to the service to be viewed is input via the operation panel or the like provided above. The channel number input here corresponds to a program number on PAT and PMT, and corresponds to a service ID on NIT. And it transfers to step S2 and STB5₁Receives the NIT. In step S3, it is determined whether or not the channel is present in the transponder received at that time. If it is determined in step S3 that the channel exists, the process proceeds to step S6. Otherwise, the process proceeds to step S4.
[0029]
In step S4, "X" is searched for the service ID in the NIT service list descriptor (see FIG. 9). Further, the satellite delivery system descriptor (see FIG. 8) combined before the service list descriptor including the searched service ID “X” is received, and the transponder transmitting “X” is received. The frequency is recognized, and the process proceeds to step S5. In step S5, STB5₁Changes the reception transponder, receives the PAT, and proceeds to step S6.
[0030]
On the other hand, in step S6, STB5₁Receives the PMT by referring to the program map PID associated with the program number “X” in the PAT, and proceeds to step S. In step S7, an elementary PID for each stream type (video, audio, etc.) corresponding to the program number “X” is recognized in the PMT, and a TS packet having a PID that matches the recognized elementary PID is separated. The process proceeds to step S8. In step S8, the separated packet is supplied to the video / audio decoder. Thereby, video data, audio data, etc. in the packet are decoded, and the viewer can view a desired service. STB5₂~ 5_mThe same processing as described above is also performed in step.
[0031]
Next, SI will be described. SI is a table in a section format that stores information related to channels, services, and the like. Examples of SI types include SDT (Service Description Table), EIT (Event Information Table), and the like. The SDT stores channel information such as a channel number, channel name, channel content description, channel logo mark, and the like. The EIT stores information related to services such as channel number, service number, start time, duration, service name, synopsis, service genre, viewing age limit, and the like.
[0032]
An EPG (Electronic Program Guide) is created based on such SI information. EPG is STB5₁, 5₂, ..., 5_mMonitor 6₁, 6₂, ..., 6_mAs a result, the service that the user wants to view can be easily found.
[0033]
Normally, services described in NIT and services described in PAT, EIT, and the like match, but in CS digital broadcasting that has already been broadcast, PAT and / Or there may be services not described in the EIT. An example of such a case is shown in FIG. When the service described in NIT is as shown in FIG. 12A and the service described in PAT and / or EIT is as shown in FIG. 12B / FIG. 12C, the service related to 444ch is It can be seen that it is described in NIT but not in PAT and / or EIT. In such a case, STB5₁~ 5_m444ch is determined to be inactive, and a message to that effect is displayed on the EPG (see FIG. 13).
[0034]
On the other hand, when retransmitting CS digital broadcasting in digital cable broadcasting, it may not be possible to receive all services in CS digital broadcasting. For example, when the satellite 1 includes L transponders and the number of digital broadcast signals in the satellite digital broadcast is M (M <L), the digital cable broadcast selectively selects the M digital broadcast signals. May be used for In such a case, the NIT is updated to delete information related to services that are not retransmitted.
[0035]
An example of the configuration of the modulation conversion unit 3 having the function of updating the NIT as described above is shown in FIG. An SHF (Super High Frequency) band digital broadcast signal transmitted from the satellite 1 and supplied via the antenna 2 is a signal processing unit 30.₁, 30₂, ..., 30_mTo be supplied. Signal processing unit 30₁~ 30_mIs a cable digital broadcast signal BS of VHF (Very High Frequency) band or UHF (Ultra High Frequency) band.₁~ BS_mConvert to The control unit 31 includes a signal processing unit 30.₁~ 30_mThe operation of the entire apparatus is controlled by supplying a predetermined signal. The operation unit 32 is a parameter related to control by the control unit 31, such as a signal processing unit 30.₁~ 30_mAre configurations related to the setting of the reception frequency of the built-in tuner. The display unit 33 displays the state of the device. Further, the adder 34 is connected to the signal processing unit 30.₁~ 30_mCable digital broadcast signal BS which is the output of₁~ BS_mAre added and sent to the transmission line 4.
[0036]
Signal processing unit 30₁The configuration will be described in more detail. A signal supplied from the antenna 2 is supplied to the tuner 40. The tuner 40 selects the digital broadcast signal transmitted from the first transponder from the supplied signals, performs frequency conversion on the selected signal, generates a QPSK signal, and demodulates the QPSK signal. 41. The demodulator 41 demodulates the QPSK signal supplied from the output tuner 40 of the tuner 40 and converts it into a DVB frame configuration signal. The output of the demodulator 41 is supplied to an ECC (Error Correction Code) decoder 42.
[0037]
The ECC decoder 42 generates an MPEG2 TS packet as digital broadcast data by performing error correction processing on the output of the demodulator 41, and supplies the generated MPEG2 TS packet to the NIT replacement circuit 43 and the NIT detection circuit 47. . The NIT detection circuit 47 detects the NIT (hereinafter referred to as NIT0) in the digital broadcast data output from the satellite 1 from the MPEG2 TS packet supplied from the ECC decoder 42. The detected NIT0 is supplied to the memory 48 and stored.
[0038]
The control unit 31 reads NIT0 from the memory 48 through the interface 50 as necessary, and updates the information related to the service in the NIT0 so as to be compatible with the cable digital broadcasting to be NIT1. That is, the control unit 31 converts the satellite delivery system descriptor (see FIG. 8) in the NIT0 into a cable delivery system descriptor (see FIG. 10), thereby updating the NIT (hereinafter, NIT1). Is written). The generated NIT1 is supplied to the memory 49 via the interface 50 and stored. Further, the control unit 31 controls the reception frequency of the tuner 40 via the interface 50.
[0039]
Here, when the number L of transponders of the satellite 1 is larger than the number M of channels of the cable digital broadcast as described above, and the M digital broadcast signals are selectively used for the cable digital broadcast, the control unit 31 It works as follows. That is, the information related to the TSID corresponding to the digital broadcast signal that is not used in the cable digital broadcast, for example, the process of deleting the TSID in FIG. 7, the contents of the descriptor, etc. is performed to change NT0 to NT1.
[0040]
The NIT replacement circuit 43 performs processing to replace NIT0 in the TS packet supplied from the ECC decoder 42 with NIT1 read from the memory 49, and supplies the MPEG2 TS packet generated by the processing to the ECC encoder 44. Here, the NIT replacement circuit 43 performs processing such as inserting a dummy bit at a location where the information related to the TSID has been deleted.
[0041]
The ECC encoder 44 adds a Reed-Solomon error correction code to the output of the NIT replacement circuit 43, and further converts it into a DVB frame configuration. The output of the ECC encoder 44 is supplied to the modulator 45. The modulator 45 modulates the supplied signal with 64QAM (Quadrature Amplitude Modulation). The output of the modulator 45 is supplied to the frequency converter 46. The frequency converter 46 converts the output of the modulator 45 into a transmission output of a predetermined frequency in the VHS band or the UHF band, so that the signal BS₁Is generated. Signal BS₁Is supplied to the adder 34.
[0042]
Signal processing unit 30₂~ 30_mThe configuration of the signal processor 30 described above is as follows.₁A configuration obtained by removing the NIT detection circuit 47, the memory 48, and the memory 49 from the configuration shown in FIG. Signal processing unit 30₂~ 30_mSelects a digital broadcast signal corresponding to the 2nd to m-th transponders from the output of the antenna 2 and reads NIT1 from the memory 49 as necessary to replace the NIT.₂~ BS_mIs supplied to the adder 34.
[0043]
Through the processing described above, the NIT is rewritten according to the retransmission conditions and the like, but for the PAT / PIT, the PAT / PIT in the TS packet received from the satellite 1 is used as it is. For this reason, there are services that are not described in the NIT but are described only in the PAT and / or EIT. Unless the handling of such services is clear, STB5₁~ 5_mThere is a risk of malfunction in the operation. For example, the processing speed may be reduced. Further, as described above with reference to FIG. 11, only the services searched from among the services described in the NIT can be provided to the viewer, so that services not described in the NIT are provided to the viewer. It is not possible. Therefore, when the EPG is displayed based on the EIT, a display related to a service that cannot be provided to the viewer is performed, which may cause confusion.
[0044]
Therefore, in the present invention, when there is a service described only in PAT and / or EIT but not described in NIT, STB5₁~ 5_mEtc., the NIT description is preferentially used and processing such as EPG display is performed, so that the display related to the service described only in the PAT and / or EIT is not performed and the channel is not selected.
[0045]
The operation of the embodiment of the present invention that realizes the processing as described above will be described with reference to the flowchart of FIG. In step S101, services described in the EIT are sequentially searched. And it transfers to step S102 and it is determined whether the said service exists in NIT about the service searched by step S101. If it is determined that the service exists in the NIT, the process proceeds to step S103. Otherwise, the process proceeds to step S101 to search for a service described in the subsequent EIT1. In step S103, the service is added to the list. In step S104, it is determined whether the service is the last service described in the EIT. If it is determined that the service is the last service in the EIT, the list creation is terminated. In other cases, the process proceeds to step S101 to search for a service described in the subsequent EIT1.
[0046]
In the list generated as described above, only services described in the NIT are described. By displaying the EPG based on such a list, services described only in the PAT and / or EIT can be prevented from being displayed on the EPG. Such an EPG display will be described with reference to FIGS. When the service in the NIT shown in FIG. 16A is compared with the service in the PAT and / or EIT shown in FIG. 16B / FIG. 16C, the following (1) and (2) are found.
[0047]
(1) Although the service related to 444ch is described in the NIT, it is not described in the PAT and / or EIT.
[0048]
(2) The service related to 555ch is described in the PAT and / or EIT, but not described in the NIT.
[0049]
In this case, the EPG created and displayed by the method described above with reference to FIG. 15 and the like is as shown in FIG. Here, 555ch is not displayed on the EPG, reflecting the situation of (2). That is, channels that are not described in the NIT but are described only in the PAT and / or EIT are not displayed on the EPG.
[0050]
Reflecting the situation of (1), it is determined that 444ch is suspended, and that effect is displayed on the EPG as in the example described above with reference to FIGS.
[0051]
In the above-described embodiment of the present invention, the present invention is applied to digital cable broadcasting for retransmitting CS digital broadcast signals. However, the present invention retransmits digital BS broadcast signals and digital terrestrial broadcast signals. The present invention can also be applied to digital cable broadcasting.
[0052]
The present invention is not limited to the above-described embodiments and the like, and various modifications and applications can be made without departing from the gist of the present invention.
[0053]
【The invention's effect】
According to the present invention, among the services described in the information table such as PAT and / or EIT in which the description about the data that can be viewed is made, the relationship between the physical information about the transmission path and the data to be viewed A list in which only what is described in an information table such as NIT is described is generated, and processing such as EPG display is performed based on the list.
[0054]
Therefore, it is possible to clarify the handling of services that are described in PAT and / or EIT but not described in NIT or the like.
[0055]
Therefore, it is possible to prevent the occurrence of problems due to the presence of services that are described in PAT and / or EIT but not described in NIT. For example, it is possible to prevent a malfunction such as a display of a service that is not described in NIT or the like and cannot be actually provided, and a malfunction such as an STB operation delay.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an example of a digital signal transmission system that receives a CS digital broadcast and retransmits it via a digital cable broadcast.
FIG. 2 is a schematic diagram for explaining a multimedia multiplexing system based on MPEG2 TS;
FIG. 3 is a schematic diagram for explaining the MPEG2 TS packet of FIG. 2;
FIG. 4 is a schematic diagram for explaining a frame configuration of a DVB system.
FIG. 5 is a schematic diagram for explaining a PAT.
FIG. 6 is a schematic diagram for explaining a PMT.
FIG. 7 is a schematic diagram for explaining NIT;
FIG. 8 is a schematic diagram for explaining a satellite delivery system descriptor.
FIG. 9 is a schematic diagram for explaining a service list descriptor;
FIG. 10 is a schematic diagram for explaining a cable delivery system descriptor.
FIG. 11 is a flowchart for explaining an example of an operation in an STB.
FIG. 12 is a schematic diagram illustrating an example where there is a service described in the NIT and not described in the PAT and / or the EIT.
FIG. 13 is a schematic diagram illustrating an example of an EPG displayed in the case of FIG.
FIG. 14 is a block diagram illustrating an example of a configuration of a modulation conversion unit.
FIG. 15 is a flowchart for explaining processing in one embodiment of the present invention;
FIG. 16 is a schematic diagram illustrating an example of a case where there is a service described in PAT and / or EIT but not described in NIT.
17 is a schematic diagram illustrating an example of an EPG displayed based on the result of the process illustrated in FIG.
[Explanation of symbols]
3 ... modulation conversion unit, 5₁~ 5_m... STB

Claims (3)

In a receiving apparatus that receives a digital broadcast signal having a NIT that describes the relationship between physical information about a transmission path and data that can be provided, and a PAT and / or EIT that includes a description of data that can be provided,
Search sequentially for services described in the PAT and / or EIT ,
Create a list in which only the services described in the above NIT are described among the searched services.
A digital signal receiving apparatus that performs processing for displaying to a viewer the contents of a service that can be provided based on the created list. In claim 1,
The digital broadcast signal, a digital signal receiving apparatus, characterized in that the CS digital broadcast signal. In a receiving method for receiving a digital broadcast signal having a NIT that describes a relationship between physical information about a transmission path and data that can be provided, and a PAT and / or EIT that includes a description of data that can be provided,
A search step for sequentially searching for services described in the PAT and / or EIT ;
A list creation step for creating a list in which only the services described in the NIT among the services searched in the search step are described;
A method for receiving a digital signal , comprising: displaying a content of a service that can be provided based on the created list for a viewer .

Images