Source: http://www.google.com/patents/US20030103446?dq=5311516
Timestamp: 2017-07-25 03:38:43
Document Index: 659416098

Matched Legal Cases: ['art 201', 'art 202', 'art 201', 'art 203', 'art 202', 'art 203', 'art 211', 'art 212', 'art 201', 'art 202', 'art 201', 'art 203', 'art 202', 'art 203', 'art 203', 'art 203', 'art 211', 'art 212', 'art 203']

Patent US20030103446 - Digital broadcast system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsAccording to the present invention, when a terrestrial digital broadcasting is carried out by applying an OFDM modulation to transport steams of MPEG-2 Systems, the plural transport streams subject to a connected transmission is divided into groups and these transport streams are coordinated. Then, a...http://www.google.com/patents/US20030103446?utm_source=gb-gplus-sharePatent US20030103446 - Digital broadcast systemAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS20030103446 A1Publication typeApplicationApplication numberUS 10/111,527PCT numberPCT/JP2001/007317Publication dateJun 5, 2003Filing dateAug 27, 2001Priority dateAug 25, 2000Also published asCN1236572C, CN1393074A, CN1767626A, CN100576901C, US7697411, WO2002017524A1Publication number10111527, 111527, PCT/2001/7317, PCT/JP/1/007317, PCT/JP/1/07317, PCT/JP/2001/007317, PCT/JP/2001/07317, PCT/JP1/007317, PCT/JP1/07317, PCT/JP1007317, PCT/JP107317, PCT/JP2001/007317, PCT/JP2001/07317, PCT/JP2001007317, PCT/JP200107317, US 2003/0103446 A1, US 2003/103446 A1, US 20030103446 A1, US 20030103446A1, US 2003103446 A1, US 2003103446A1, US-A1-20030103446, US-A1-2003103446, US2003/0103446A1, US2003/103446A1, US20030103446 A1, US20030103446A1, US2003103446 A1, US2003103446A1InventorsShinji Negishi, Tamotsu IkedaOriginal AssigneeShinji Negishi, Tamotsu IkedaExport CitationBiBTeX, EndNote, RefManPatent Citations (4), Referenced by (29), Classifications (30), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetDigital broadcast system
BEST MODE FOR CARRYING OUT THE INVENTION [0035] Now, an example that the present invention is applied to a terrestrial digital broadcasting system of an ISDB-Tn (Integrated Services Digital Broadcasting-Terrestrial narrow) system will be described. The ISDB-Tn is a terrestrial digital audio broadcasting standard employed in Japan. [0036] A terrestrial digital broadcasting system 1 according to an embodiment of the present invention is a system that terrestrial broadcasting transmitted by a digital system respectively from a plurality of broadcasting stations 10, 20 and 30 are received by a receiver 200. [0037] The broadcasting stations 10, 20 and 30 are respectively provided with transmitters 100. Each transmitter 100 transmits the broadcast wave through an antenna. The ranges of the broadcast waves transmitted from the broadcasting stations 10, 20 and 30 are limited. In the terrestrial digital broadcasting system 1, ranges where the broadcast waves can be received are shown as service areas 10 a, 20 a and 30 a. [0038] In the ISDB-Tn, an OFDM (Orthogonal Frequency Division Multiplexing) modulation system is employed for a modulation system. Further, in the ISDB-Tn, MPEG-2 Systems (ITU-T H.222.0, ISO/IEC 13818-1) are used as digital information series to be transmitted. In addition, in the ISDB-Tn, one transport stream is transmitted to one transmission channel. [0039] Still further, in the ISDB-Tn, there are provided groups each composed of a data unit called a data segment including a plurality of transport packets (TSP) prescribed in the MPEG-2 Systems. Further, pilot signals (SP [Scattered Pilot], CP [Continual Pilot], TMCC [transmission and Multiplexing Configuration Control], AC [Auxiliary Channel]) are added to the data segment to form a transmission frame called an OFDM segment and perform an OFDM modulation. [0040] The data configuration (in the case of a mode 1 in the ISDB-Tn standard) of the OFDM segment is shown in FIGS. 2 and 3. In FIGS. 2 and 3, an axis of abscissas shows a direction of frequency and an axis of ordinates shows a direction of time. FIG. 2 shows the configuration of the OFDM segment when an information signal is modulated by a differential modulation (DQPSK). FIG. 3 shows the configuration of the OFDM segment when an information signal is modulated by a synchronous modulation (QPSK, 16QAM, 64QAM). [0041] As shown in FIGS. 2 and 3, in the ISDB-Tn (mode 1), 204 OFDM symbols (symbol Nos. #0 to #203) are arranged in the direction of time. The OFDM symbol is a unit for performing a simultaneous FFT. The 1 OFDM symbol is composed of 108 data. The data forming each OFDM symbol is modulated to 108 pieces of sub-carriers (carrier Nos. #0 to #107) respectively assigned to bands. [0042] The OFDM segment of the differential modulation system comprises various kinds of control signals having information signals (S0,0 to S95,203) orthogonally modulated in accordance with the DQPSK, CP (Continual Pilot) signals, TMCC (Transmission and Multiplexing Configuration Control) signals and AC (Auxiliary Channel) signals. On the other hand, the OFDM segment of the synchronous modulation system comprises control signals having information signals (S0,0 to S95,203) orthogonally modulated in accordance with the QPSK, 16QAM, 64QAM, CP signals, TMCC signals, AC signals and SP (Scattered Pilot) signals. [0043] The CP signal is a signal having completely fixed phase and amplitude. When the information signal is modulated in accordance with the differential modulation system, the CP signal is arranged in the first carrier of each OFDM symbol (a position of the lowest frequency). [0044] The SP signal is a signal modulated on the basis of BPSK modulation. The SP signals are arranged at intervals of 12 carriers in the direction of frequency and at intervals of 4 symbols in the direction of symbols. Since the SP signals are utilized to estimate propagation line characteristics when a receiving side equalizes a waveform, the SP signals are inserted into the OFDM segment only in the case of a synchronous modulation (QPSK, 16QAM, 64QAM) which requires a waveform equalization. [0045] The TMCC signals and the AC signals are signals modulated on the basis of BPSK modulation and arranged in prescribed positions in the segment. The AC signal is employed for transmitting additional information. The TMCC signal is transmission control information composed of 204 bits (B0 to B203) which concludes for each OFDM segment unit. In the TMCC signal, a synchronous code, a modulation system, a convolutional coding rate, an interleave length and the like are included as the transmission control information. [0046] In the ISDB-Tn, one or three of the above-described OFDM segments are combined together in the frequency direction to form one transmission channel and transmit a transport stream. In the ISDB-Tn, a transmission form that three OFDM segments are arranged in the frequency direction to form a transmission channel is called a three segment form. A transmission form that one OFDM segment is arranged in the frequency direction to from one transmission channel is called a one segment form. [0047] In the three segment form, one OFDM segment (layer A) at the central part in the frequency direction and two OFDM segments (layers B) adjacent to the central segment in the upper and lower parts in the frequency direction form a transmission channel. Thus, a two-layered transmission that the transmission property of the layer A is different from that of the layer B can be carried out. More specifically, in the three segment form, parameters such as a modulation system, the coding rate of an inner code and a time interleave length in the layer A may be different from those in the layer B. Further, in the three segment form, a frequency interleave is completed in each layer. Therefore, the OFDM segment of the Layer A in the three segment form can be partly received even by a receiver with its function restricted which can receive only a transmission signal of one segment form. [0048] The OFDM segment is prescribed so as to be interactively applied to ISDB-Tw (Integrated Services Digital Broadcasting-Terrestrial wide) as a terrestrial digital television broadcasting system. In the ISDB-Tw, 13 OFDM segments form one channel composed of a three-layered configuration having layers A, B and C. [0049] According to the ISDB-Tn in Japan, a frequency band such as a band of 188 MHz to 194 MHz or a band of 192 to 198 MHz (bandwidth of 6 MHz) is assigned as an available frequency band. In the ISDB-Tn, the bandwidth of 6 MHz is divided into 13 segments. In the ISDB-Tn, the above-described OFDM segments are assigned to the 13 segments to perform a transmission. [0050] Further, in the ISDB-Tn, when a plurality of transmission channels are subject to a connected transmission system, the connected transmission is carried out between the transmission channels in the 13 segments in this 6 MHz band. According to the ISDB-Tn, an arbitrary number of combinations among the number of combinations of the segments located within a range of 2 to 13 can be connected together. Additionally, the transmission channel of the one segment form can be connected to the transmission channel of the three segment form. [0051] In the ISDB-Tn, PSI/SI (Program Specific Information/Service Information) which is auxiliary information for selecting programs or obtaining the information of programs is included in a transport stream and the transport stream including the PSI/SI is transmitted. The PSI/SI utilized in the ISDB-Tn is defined in the MPEG-2 Systems and the ARIB STD-B10. [0052] In the MPEG-2 Systems and the ARIB STD-B10, an NIT (Network Information Table) is prescribed as one of the PSI/SI information. The NIT shows information concerning the physical configuration of the transport stream supplied by a network and the features of the network itself. In the ARIB STD-B10, there is provided a definition as described below. That is, a terrestrial delivery system descriptor [terrestrial_delivery_system_descriptor ( )] indicating physical conditions concerning a broadcast signal itself such as frequency information or transmission parameters related to the transport stream which belongs to the network or a service list descriptor Service Description Table [service_list_descriptor( )] is included in a transport stream loop in the NIT and the transport stream loop including them is transmitted. [0053] Now, the inventors of the invention decides that a connected transmission descriptor [connected_transmission_descriptor( )] in which the physical conditions of the transport stream belonging to the network upon connected transmission are described is newly defined as a descriptor to be included in the NIT (Network Information Table). [0054] Now, the connected transmission descriptor [connected_transmission_descriptor( )] will be described below. [0055] [0055]FIG. 5 shows the data structure of the connected transmission descriptor [connected_transmission_descriptor( )]. [0056] The connected transmission descriptor [connected_transmission_descriptor( )] is a descriptor which can identify the groups of the transport streams subject to the connected transmission to enumerate the transport streams in the groups. The connected transmission descriptor [connected_transmission_descriptor( )] is described in the TS loop of the NIT. [0057] In a [descriptor_tag], a tag for discriminating the descriptor from other identifiers is described. [0058] In a [descriptor_length], the number of all bytes continuing below is described. [0059] In a [connected_transmission_group_id], a connected transmission group ID for identifying the group of the transport stream subject to the connected transmission is described. [0060] In a [segment_type], is described a segment form type for identifying whether the transport stream designated by the connected transmission descriptor has the one segment form or the three segment form. The [segment_type] is information of 2 bits. As shown in FIG. 6, “00” designates the one segment form, “01” designates the three segment form and “11” indicates a decision by referring to a TMCC signal. “10” designates a reserve for future. [0061] In a [modulation_type_A], is described a modulation system type indicating a synchronous modulation system or a differential modulation system. The [modulation_type_A] indicates the modulation system type of the data of a whole segment in the case of the one segment form, and the modulation system type of the layer A in the case of the three segment form. The [modulation_type_A] represents information of two bits. As shown in FIG. 7, “00” represents the differential modulation system (DQPSK), “01” represents the synchronous modulation system (QPSK, 16QAM, 64QAM) and “11” represents a decision by referring to a TMCC signal. “10” designates a reserve for future. [0062] In a [modulation_type_B], is described a modulation system type for indicating whether the modulation system of the layer B in the three segment form is the synchronous modulation system or the differential modulation system. The [modulation_type_B] is meaningless in the case of the one segment form. The [modulation_type_B] is information of 2 bits. Like the [modulation_type_A], “00” designates the differential modulation system (DQPSK), “01” designates the synchronous modulation system (QPSK, 16QAM. 64QAM) and “11” designates a decision by referring to a TMCC signal. “10” designates a reserve for future. [0063] In a [additional_connected_transmission_info], is described supplemental information specified by the application regulations of an enterprise. [0064] The data structure of the NIT in which the above-described connected transmission descriptor [connected_transmission_descriptor( )] is described is shown in FIG. 8. [0065] The NIT (Network Information Table) is a table for indicating information concerning the physical configuration of the transport stream supplied by the network and the features of the network itself. In the NIT, an NIT showing the information of its own network and an NIT showing the information of other network are included. [0066] [table_id] designates an identifier showing what is indicated by a network information section. In the case of the NIT of its own network, a value of “0x40” is described. In the case of the NIT of other network, a value of “0x41” is described. [0067] [section_syntax_indicator] designates an identifier indicating a section syntax instruction and its value is always set to “1”. [0068] [reserved_future_use] designates a reserve extended area in which any information for future use can be prescribed. [0069] [reserved] designates a reserve area. [0070] [section_length] prescribes the number of bytes from a part immediately after a section length field to the last part of a section including CRC (Cyclic Redundancy Check). [0071] [network_id] indicates an ID for identifying a network designated by NIT. [0072] [version_number] designates the version number of a sub-table. [0073] [current_next_indicator] designates an identifier for indicating that the sub-table is a present sub-table when the value thereof is “1”, and that a supplied sub-table is not applied yet and a next sub-table is used, when the value is “0”. [0074] [section_number] designates the number of a section. When the section is a first section in the sub-table, a value of “0x00” is shown. The section number is increased by “1” for each addition of the section having the same [table_id] and [network_id]. [0075] [last_section_number] designates the last section of the sub-table to which a section belongs, that is, the number of the section having the largest section number. [0076] [network_descriptor_length] designates the number of all bytes of a loop of a subsequent network descriptor (descriptor( ). In the loop, the network descriptor is described. [0077] [transport_stream_loop_ength] designates the number of all bytes of a transport stream loop which concludes immediately before the first byte of a CRC. [0078] Then, a TS loop is subsequently described. [0079] [transport_stream_id] in the TS loop designates an ID for discriminating the transport stream from other multiplex in a delivery system. [0080] [original_network_id] designates an ID for indicating [network_id] of an original network. [0081] [transport_descriptor_length] designates an identifier for indicating the number of all bytes of a loop of a subsequent transport descriptor (descriptors). In the transport descriptor, the connected transmission descriptor [connected_transmission_descriptor( )], the terrestrial delivery system descriptor [terrestrial_delivery_system_descriptor( )], and the service list descriptor Service Description Table [service_list_descriptor( ) ] are described. [0082] [CRC—32] designates a CRC and an error code including a CRC value that a register output obtained after a whole section is processed is “0”. [0083] As described above, the connected transmission descriptor [connected_transmission_descriptor( )] serves to coordinate a plurality of transmission channels (transport stream) subject to the connected transmission. Therefore, the connected transmission descriptor is included in the control information of the MPEG-2 Systems, so that the plural transport streams subject to the connected transmission are coordinated to inform a receiver of the coordinated transport streams. [0084] Accordingly, the receiver analyzes the connected transmission descriptor included in the NIT so that the receiver can decide whether or not an upper adjacent segment (a segment adjacent to a high frequency side) whose connected transmission is performed is present in a segment in which a currently received transport stream is contained, and whether or not a lower adjacent segment (a segment adjacent to a low frequency side) whose connected transmission is performed is present, and further whether the modulation system of the upper adjacent or lower adjacent segment is a synchronous modulation system or a differential modulation system. Thus, when the modulation system of the segment in which the currently received transport stream is contained is the synchronous modulation system, the receiver can estimate transmission characteristics by using SP signals included in the upper and lower adjacent segments. The SP signals of the adjacent segments are used as described above to estimate the transmission characteristics, so that the transmission characteristics of a sub-carrier in the frequency direction of the segment can be precisely estimated and a waveform can be more accurately equalized. [0085] When the adjacent transmission channel (transport stream) whose connected transmission is performed has the three segment form, a layer B in the adjacent transmission channel serves as an adjacent segment. When the modulation system of the layer B is the synchronous modulation system, transmission characteristics can be estimated by using an SP signal. Further, when the transmission channel which is receiving the transport stream has the three segment form, a segment adjacent to the segment of a layer A is a layer B in its own transmission channel (transport stream). Further, a segment adjacent to the segment of the layer B is the segment of the layer A in its own transmission channel (transport stream) and the segment of other transmission channel (other transport stream). [0086] Further, when the receiver analyzes the connected transmission descriptor included in the NIT to switch a transmission channel for receiving a transport stream to another transmission channel, the receiver can obtain information as to whether or not there exists a relation of the connected transmission between the transmission channel before switching and the transmission channel after switching. When there exists the relation of the connected transmission between the transmission channel before switching and the transmission channel after switching, the receiver can continuously employ a synchronizing timing established in the transmission channel before switching in the transmission channel after switching. Therefore, the receiver can simplify a synchronization pull-in operation for demodulation and decrease channel switching time. [0087] The above-described connected transmission descriptor is defined in the edition 3.1 of the ARIB STD-B10 issued in Jul. 27, 2001. [0088] As the method for coordinating a plurality of transmission channels (transport streams) subject to the connected transmission, although the example that the connected transmission descriptor [connected_transmission_descriptor( )] as shown in FIG. 5 is included in the NIT and transmitted is described, a plurality of transmission channels (transport streams) may be coordinated by a second connected transmission descriptor [connected_transmission_descriptor—2( )] as shown below and a new terrestrial delivery system descriptor [terrestrial_delivery system_descriptor 2( )] obtained by extending the terrestrial delivery system descriptor [terrestrial_delivery_system_descriptor( )] prescribed by the ARIB STD-B10. [0089] [0089]FIG. 9 shows the data structure of the second connected transmission descriptor [connected_transmission_descriptor—2( )]. [0090] The connected transmission descriptor [connected_transmission_descriptor—2( )] designates a descriptor which can enumerate transport streams subject to the connected transmission together with the transport stream. The connected transmission descriptor [connected_transmission_descriptor—2( )] is described in the TS loop of the NIT of, for instance, a self-network. [0091] [descriptor_tag] designates a tag for discriminating the descriptor from other identifiers. [0092] [descriptor_length] designates the number of all bytes of a subsequent loop (means a loop of [for(i=0; <N; i++) {to}]). [0093] In the loop [for(i=0; <N; i++) {to}], [original_network_id] and [transport_stream_id] are described. [0094] The [original_network_id] designates a network ID of an original network of a transport stream subject to the connected transmission. [0095] The [transport_stream_id] designates an ID for identifying a transport stream subject to the connected transmission. [0096] [0096]FIG. 10 shows the data structure of the extended terrestrial delivery system descriptor [terrestrial_delivery_system_descriptor—2( )]. [0097] The terrestrial delivery system descriptor [terrestrial_delivery_system_descriptor—2( )] designates a descriptor for indicating the physical conditions of a terrestrial transmission line. The terrestrial delivery system descriptor is described in the TS loop of the NIT. [0098] [descriptor_tag] designates a tag for discriminating the descriptor from other identifiers. [0099] [descriptor_length] indicates the number of all bytes of subsequent data. [0100] [area_code] designates a service area to which the transport stream is transmitted. The [area_code] is extended to 16 bits as shown in FIG. 11. [0101] [guard_interval] designates the guard interval of the transport stream. [0102] [transmission_inode] designates the mode information of the transport stream. [0103] [segment_type] designates information of 1 bit for identifying the one segment form or the three segment form. For example, as shown in FIG. 11, in the case of the one segment form, “0” is described. In the case of the three segment form, “1” is described. This [segment_type] is new information which is not prescribed in the ARIB STD B-10. [0104] [modulation_type_A] designate segment form identifying information of 1 bit indicating whether the segment form of the layer A is the synchronous modulation system or the differential modulation system. For instance, as shown in FIG. 11, when the layer A shows the synchronous modulation system, “O” is described, and when the layer A shows the differential modulation system, “1” is described. The [modulation_type_A] is new information which is not prescribed in the ARIB STD B-10. [0105] [modulation_type B] designate segment form identifying information of 1 bit indicating whether the segment form of the layer B is the synchronous modulation system or the differential modulation system. For instance, as shown in FIG. 11, when the layer B shows the synchronous modulation system, “0” is described, and when the layer B shows the differential modulation system, “1” is described. The [modulation_type_B] is new information which is not prescribed in the ARIB STD B-10. [0106] [modulation_type_C] designate segment form identifying information of 1 bit indicating whether the segment form of the layer C is the synchronous modulation system or the differential modulation system. For instance, as shown in FIG. 11, when the layer C shows the synchronous modulation system, “0” is described, and when the layer C shows the differential modulation system, “1” is described. The [modulation_type_C] is new information which is not prescribed in the ARIB STD B-10. [0107] [frequency] designates an identifier indicating frequency under which the transport stream is transmitted. [0108] The above-described second connected transmission descriptor [connected_transmission_descriptor—2( )] and the extended terrestrial delivery system descriptor [terrestrial_delivery_system_descriptor—2( )] are also described in the TS loop of the NIT, so that a plurality of transport streams subject to the connected transmission can be coordinated together to inform the receiver of the coordinated transport streams. [0109] Now, a transmitter 100 which can perform a connected transmission in a transmitting station 10 will be described. [0110] As shown in FIG. 12, the transmitter 100 comprises a plurality of source encoders 101 a (101 a-101 to 101 a-n), an OFDM transmitter 102, an antenna 103 and a system controller 104. [0111] To each source encoder 101 a, video data or audio data in a baseband is inputted. They are compressed and encoded in accordance with, for instance, the MPEG-2 system to generate program streams. The source encoders 101 a respectively multiplex these plural program streams to form transport streams prescribed in the MPEG-2 Systems. Each transport stream outputted from each source encoder 101 a corresponds to each transmission channel. Further, to each source encoder 101 a, the control information (PSI/SI information) such as the NIT generated in the system controller 104 is inputted. The control information is also included in and multiplexed to the transport streams. In the control information, the above-described connected transmission descriptor [connected_transmission_descriptor( )] is included. [0112] The OFDM transmitter 102 applies a transmission line encoding process to each transport stream inputted from each source encoder 101 a, that is, each transmission channel to form an OFDM symbol shown in FIGS. 2 and 3 for each transport stream unit. Subsequently, the OFDM transmitter 102 synchronizes a plurality of OFDM symbols generated respectively for the transmission channels in the time base direction and further multiplexes these OFDM symbols in the frequency direction. Then, the OFDM transmitter 102 applies a simultaneous IFFT conversion to the OFDM symbols multiplexed in the frequency direction and an OFDM modulation to the multiplexed OFDM symbols. The OFDM transmitter 102 carries out the processes as mentioned above so that the OFDM transmitter 102 can connect altogether the plural transmission channels. Then, the transmitted waves of the plural transmission channels connected by the OFDM transmitter 102 are transmitted outside through an antenna 103. [0113] Now, an explanation will be given to a receiver 200 for receiving transmitted terrestrial broadcast waves. [0114] As shown in FIG. 13, the receiver 200 comprises a demodulation part 201 to which a broadcast signal is inputted from a receiving antenna 220 for receiving the broadcast wave of a terrestrial broadcasting to apply a digital demodulation process to the broadcast signal, a decoding part 202 for applying a decoding process to the signal digitally demodulated by the demodulation part 201 to take out a transport stream, an extracting part 203 for extracting digital data multiplexed to the transport stream taken out by the decoding part 202 to perform an output corresponding to the contents of the digital data, an audio decoder 204, a video decoder 205 and a data decoder 206 to which the digital data extracted by the extracting part 203 is respectively inputted to respectively generate an audio signal, a video signal and a data signal, a memory 208 for holding the control information (PSI/SI information) included in the transport stream, a system controller 209 for controlling the respective parts of the receiver 200, an operation input part 211 to which the operation of a user is inputted and a display part 212 for displaying the data for the user. [0115] The demodulation part 201 applies the digital demodulation process to the broadcast signal inputted from the receiving antenna 220. [0116] The decoding part 202 decodes the signal by performing a deinterleave process or an error correction process relative to the signal digitally demodulated in the demodulation part 201 to take out the transport stream. [0117] The extracting part 203 extracts each TS packet on the basis of a PID (packet identifying number) described in a TS packet in the transport stream inputted from the decoding part 202 to decide whether the digital data included in each TS packet belongs to the audio signal or to the video signal and output each digital data to the audio decoder 204 or the video decoder 205. Further, the extracting part 203 extracts the PSI/SI information such as NIT, SDT and BAT included in the transport stream and outputs each information included in the PSI/SI information to the system controller 209. [0118] The audio decoder 204, the video decoder 205 and the data decoder 206 respectively apply the decoding processes to the digital data inputted from the extracting part 203 to generate the audio signal, the video signal and the data signal. [0119] When an audio broadcasting only having audio information is simply received, the video decoder 205 and the data decoder 206 in the receiver 200 may not be provided. [0120] The memory 208 may be composed of various kinds of rewritable semiconductor memories, and for instance, detachably attached to the receiver 200. [0121] The system controller 209 transmits various kinds of signals to and receives signals from the parts of the receiver 200 to control the operations of the respective parts. The system controller 209 also extracts the information included in the PSI/SI information such as NIT, SDT and BAT inputted from the extracting part 203 to holds the information in the memory 208. [0122] In the operation input part 211, various types of operations to the receiver such as a receiving start instruction, a service changing instruction and a setting of service numbers are performed by the user. [0123] The display part 212 is composed of, for instance, a liquid crystal display device for displaying data such as service numbers, service names and additional information for the user. [0124] Now, a data base constructed on the memory 208 will be described below. [0125] On the memory 208, a terrestrial delivery system list, a service list and the connected transmission relation of transport streams are constructed as the data base. [0126] The system controller 209 of the receiver 200 constructs the terrestrial delivery system list and the service list as shown in FIGS. 14 and 15 on the basis of the NIT and SDT (Service Description Table) inputted from the extracting part 203. In the NIT, a terrestrial delivery system descriptor and a service list descriptor are described. Thus, these descriptors are referred to so that the above-described terrestrial delivery system list and the service list can be constructed. In the terrestrial delivery system list and the service list, information concerning the transport streams transmitted in all service areas included in the PSI transmitted in the NIT is tabulated on the basis of “transport_stream_id” which is information for identifying each transport stream. However, in order to reduce the quantity of memory of the receiver, all information does not need to be necessarily constantly stored and held. [0127] For instance, it can be understood that “frequency”, “mode”, “guard interval”, and “area code” included in information required for receiving the transport stream in which the “transport_stream_id” is “TS1” respectively designates “xxxMHz”, “10”, “11” and “201010010011” by referring to the terrestrial delivery system list on the basis of the “transport_stream_id”. Similarly, the reference to the service list makes it possible to respectively understand a “service ID” and or a “service type” required for specifying a service (program) included in the transport stream that the “transport_stream_id” is “TS1” as “service 2” and “audio broadcasting”. [0128] Accordingly, the receiver 200 refers to the terrestrial delivery system list and the service list so that the receiver can switch a reception from the service (program) which is being received to other service (program). [0129] Further, the system controller 209 of the receiver 200 extracts the connected transmission descriptor [connected_transmission_descriptor( )] from the NIT in the currently received transport stream to constitute a connected transmission list obtained by listing a “TS-id” and a “connected transmission group ID” shown by each connected transmission descriptor and a “service ID” and a “network ID” as required. [0130] The connected transmission list is constructed as mentioned above, hence other transport streams coordinated by the connected transmission descriptor can be recognized from the currently received transport stream. For example, when the transport stream having the connected transmission relation is switched to other transport stream, the transport stream can be rapidly switched with reference to the above-described list. [0131] Further, when a reception is switched from the currently received service (program) to other service (program), the system controller 209 initially refers to the connected transmission list constructed on the memory 208. In this case, when a transport stream to which the currently received transport stream is switched is not shown on the connected transmission list, an ordinary receiving start process is carried out. On the contrary, when the transport stream to which the currently received transport stream is switched is shown on the connected transmission list, the channel is switched while a synchronizing operation upon demodulation is maintained. [0132] Since the connected transmission descriptor is not always defined for all the transport streams, the connected transmission list may not be constructed for the transport stream which is not subject to the connected transmission process. [0133] Further, since the connected transmission relation is different for each transport stream, the connected transmission list is updated when the transport stream is switched to other transport stream. INDUSTRIAL APPLICABILITY [0134] In a digital broadcasting system, a digital broadcasting transmitter, a digital broadcasting receiver and a digital broadcasting method according to the present invention, a signal obtained by modulating a transport stream specified in MPEG-2 Systems in accordance with an Orthogonal Frequency Division Multiplexing (OFDM) system can be employed as a broadcast signal. When a connected transmission that the OFDM signals to be transmitted to a plurality of transmission channels are multiplexed in the frequency direction while orthogonality is maintained is carried out, a connected transmission descriptor for coordinating a plurality of transport streams subject to a connected transmission process is included in control information prescribed in the MPEG-2 Systems and transmitted. [0135] Thus, according to the present invention, a receiver side can know the transmission channels subject to the connected transmission process. Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS5946326 *May 3, 1996Aug 31, 1999Nokia Telecommunications OyMethod and an equipment for transmitting a file-based multimedia and hypermedia service to a mobile receiverUS6040867 *Feb 20, 1997Mar 21, 2000Hitachi, Ltd.Television signal receiving apparatus and method specificationUS6366309 *Oct 7, 1996Apr 2, 2002Robert Bosch GmbhMethod for the terrestrially transmitting digital signalsUS6985432 *Jan 28, 2000Jan 10, 2006Zion HadadOFDM communication channel* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7280806 *Dec 16, 2003Oct 9, 2007Matsushita Electric Industrial Co., Ltd.Communication systemUS7690015 *Dec 31, 2001Mar 30, 2010Electronics And Telecommunications Research InstitutePSIP converter and converting method and digital cable television broadcasting system using the PSIP converterUS7961759 *Feb 28, 2003Jun 14, 2011Vixs Systems, Inc.Method and apparatus for synchronized channel transmissionUS8005167Aug 25, 2008Aug 23, 2011Lg Electronics Inc.Digital broadcasting system and method of processing data in digital broadcasting systemUS8160173Apr 29, 2009Apr 17, 2012Panasonic CorporationCommunication systemUS8165244Jul 7, 2011Apr 24, 2012Lg Electronics Inc.Digital broadcasting system and method of processing data in digital broadcasting systemUS8291464Apr 10, 2009Oct 16, 2012Hitachi, Ltd.Digital broadcast receiving apparatusUS8391404Mar 14, 2012Mar 5, 2013Lg Electronics Inc.Digital broadcasting system and method of processing data in digital broadcasting systemUS8571132 *Dec 21, 2005Oct 29, 2013Qualcomm IncorporatedConstrained hopping in wireless communication systemsUS8614770Apr 16, 2007Dec 24, 2013Mitsubishi Electric CorporationDigital broadcast receiver and receiving methodUS8705965Jan 10, 2011Apr 22, 2014Hitachi, Ltd.Method of recovery from sleep state of an ONU in a PON system capable of power savingUS8867641Aug 30, 2013Oct 21, 2014Kabushiki Kaisha ToshibaConcatenated transmission system and concatenated transmission methodUS9112641Oct 11, 2011Aug 18, 2015Sony CorporationTransmission device and transmission method thereof, and reception deviceUS9265007Oct 19, 2012Feb 16, 2016Sony CorporationTransmission device, transmission method, reception device, reception method, and programUS9270394 *Oct 11, 2011Feb 23, 2016Sony CorporationTransmission device and transmission method thereof, and reception device of connected transmission channels in a 13-segment formatUS20030081686 *Dec 31, 2001May 1, 2003Joon-Young JungPSIP converter and converting method and digital cable television broadcasting system using the PSIP converterUS20030174673 *Dec 18, 2002Sep 18, 2003Osamu TomobeDigital broadcast receiving apparatusUS20040017831 *Apr 7, 2003Jan 29, 2004Jian ShenSystem and method for processing SI data from multiple input transport streamsUS20040107436 *Nov 25, 2003Jun 3, 2004Fujitsu LimitedDigital broadcast signal distribution system and subscriber terminalUS20040125787 *Feb 28, 2003Jul 1, 2004May Michael R.Method and apparatus for synchronized channel transmissionUS20040127166 *Dec 16, 2003Jul 1, 2004Mitsuaki OshimaCommunication systemUS20060146760 *Dec 21, 2005Jul 6, 2006Aamod KhandekarConstrained hopping in wireless communication systemsUS20080043870 *Oct 5, 2007Feb 21, 2008Mitsuaki OshimaCommunication systemUS20090021641 *Apr 16, 2007Jan 22, 2009Daiki MatsuuraDigital broadcast receiver and receiving methodUS20090190668 *Apr 10, 2009Jul 30, 2009Osamu TomobeDigital broadcast receiving apparatusUS20090274240 *Apr 29, 2009Nov 5, 2009Mitsuaki OshimaCommunication systemUS20110211837 *Jan 10, 2011Sep 1, 2011Hitachi, Ltd.Method of Recovery From Sleep State of an Onu in a Pon System Capable of Power SavingUS20130177101 *Oct 11, 2011Jul 11, 2013Sony CorporationTransmission device and transmission method thereof, and reception deviceCN100466731CSep 21, 2006Mar 4, 2009青岛有线宽带数字电视发展有限公司;天栢宽带网络科技(上海)有限公司Information processing apparatus and method* Cited by examinerClassifications U.S. Classification370/208, 375/E07.002, 375/E07.268, 348/E05.108International ClassificationH04N7/173, H04H20/00, H04H20/28, H04H60/43, H04N7/58, H04N5/44, H04N7/24, H04H20/26, H04H20/72Cooperative ClassificationH04N21/2365, H04N21/4347, H04N21/2362, H04H2201/20, H04H20/26, H04N5/4401, H04H20/72, H04N21/4382, H04N21/2383European ClassificationH04N21/2365, H04N21/2362, H04N21/2383, H04N21/434V, H04N21/438M, H04N5/44N, H04H20/26, H04H20/72Legal EventsDateCodeEventDescriptionAug 12, 2002ASAssignmentOwner name: SONY CORPORATION, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NEGISHI, SHINJI;IKEDA, TAMOTSU;REEL/FRAME:013186/0319;SIGNING DATES FROM 20020418 TO 20020419Owner name: SONY CORPORATION,JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NEGISHI, SHINJI;IKEDA, TAMOTSU;SIGNING DATES FROM 20020418 TO 20020419;REEL/FRAME:013186/0319Aug 17, 2010CCCertificate of correctionOct 7, 2013FPAYFee 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