JP4786619B2 - Recording device - Google Patents

Description

  The present invention relates to a recording apparatus capable of recording a digital television broadcast.

  6 MHz is allocated to the channel bandwidth of Japanese terrestrial digital television broadcasting, and 13 frequency blocks among the frequency blocks obtained by dividing the 6 MHz into 14 are used for broadcasting. In this digital terrestrial television broadcasting, the carrier modulation method and error correction strength can be changed for each segment. Transmission of broadcast waves in segment units with different modulation methods and error correction strengths is called hierarchical transmission. For example, in terrestrial digital television broadcasting, QPSK, 16QAM, and 64QAM are adopted as the modulation methods. QPSK, 16QAM, and 64QAM increase the information rate in this order, but on the other hand, the strength against transmission errors decreases (that is, a carrier modulated with 64QAM has the maximum information rate, The strength against transmission errors is the weakest.)

  When the above-described hierarchical transmission is used, a hierarchy used for broadcasting is set according to the form of a receiver that receives terrestrial digital television broadcasting. For example, a high-definition broadcast is broadcast to a stationary receiver using 12 segments that employ a modulation method with a large information rate out of 13 segments, and a modulation method that is strong against transmission errors is used. There is a hierarchy setting such as broadcasting a complementary broadcast to the mobile receiver by the remaining one segment. Since then, the hierarchies where modulation schemes with high information rates (modulation schemes with low strength against transmission errors) have been adopted are weak, and modulation schemes with low information rates (modulation schemes with high strength against transmission errors) have been adopted. Such a hierarchy is called a strong hierarchy.

Currently, the complementary broadcast broadcast on the strong hierarchy broadcasts the same content as the high-definition broadcast broadcast on the weak hierarchy. For this reason, Patent Document 1 discloses a recording apparatus capable of receiving these broadcasts, and when a part of the content broadcast by the high-definition broadcast cannot be received, it cannot be received. There is disclosed a recording apparatus that records a part of content complemented by the same part of the content broadcast by complementary broadcasting.
JP 2006-20197 A

  In Patent Document 1, a hierarchical transmission descriptor is used as a descriptor used in PSI (Program Specific Information) and SI (Service Information: Service Specific Information) in terrestrial digital television broadcasting, and broadcast in a weak hierarchy. Is received in a good reception state, the layer transmission descriptor to be described in the PMT (Program Map Table) is deleted, while the elementary stream broadcast in the weak layer is received. Has been disclosed about a recording information generating apparatus that leaves a hierarchical transmission descriptor in the PMT when received in a bad state. The information reproducing device disclosed in Patent Document 1 refers to the PMT when reproducing an elementary stream broadcast in a weak hierarchy, and if the hierarchical transmission descriptor is deleted, reproduces the elementary stream. On the other hand, if the hierarchical transmission descriptor remains, the elementary stream broadcast on the strong hierarchy specified by the hierarchical transmission descriptor is reproduced.

  However, ARIB TR-B14 2.9 edition Vol.4, Part 4, 5.2 of the terrestrial digital television broadcast operation specification stipulates that hierarchical transmission descriptors are not used in terrestrial digital television broadcast.

  The present invention has been made in view of the above circumstances, and in a digital terrestrial television broadcast, without using a hierarchical transmission descriptor, a missing portion of an elementary stream broadcast in a weak hierarchy is broadcasted in a strong hierarchy. It is an object to provide a recording apparatus, a recording method, a program, and a data structure that can be complemented by a stream.

  The recording apparatus of the present invention includes first stream data to which a first identifier is assigned, section data specifying at least the first identifier of the first stream data, transmitted in a first layer, and And second stream data transmitted in a second layer different from the first layer and assigned with a second identifier having a simulcast relationship with the first identifier. A storage unit, a reception status detection unit that determines whether or not content is stored in the first stream data, and a determination that the content is not stored in the first stream data by the reception status detection unit. A PMT conversion unit that stores the section data in which the first identifier is replaced with the second identifier in the storage unit. A.

  The recording method of the present invention includes: first stream data to which a first identifier is assigned, transmitted at a first layer, and section data designating at least the first identifier of the first stream data; Storing second stream data to which a second identifier having a relationship of simulcasting and the first identifier transmitted in a second layer different from the first layer is assigned. When it is determined whether or not content is stored in the first stream data, and it is determined that no content is stored in the first stream data, the first identifier is the second identifier. The section data replaced with is stored.

  The program of the present invention is for causing a computer to execute the procedure of the recording method of the present invention.

  In the data structure of the present invention, the first identifier assigned to the first stream data transmitted in the first layer is the second identifier transmitted in the second layer different from the first layer. This is a structure of section data that can be replaced with a second identifier that is assigned to stream data and has a relationship with the first identifier and simulcast.

  In addition, the recording apparatus of the present invention includes a receiving unit that receives a digital television broadcast wave, and the first digital television broadcast wave that is received by the receiving unit and transmitted in the first layer, or the second A demodulating / decoding unit that demodulates and decodes the second digital television broadcast wave transmitted in the hierarchy and outputs stream data; and the first stream data included in the stream data output by the demodulating / decoding unit And a data storage unit that stores the section data and the second stream data in the storage unit.

  In addition, the recording apparatus of the present invention includes a recording apparatus in which the reception status detection unit determines that no content is stored in the first stream data when a reception intensity received by the reception unit is smaller than a threshold value. .

  In the recording apparatus of the present invention, when the reception status detection unit cannot decode the first digital television broadcast wave by the demodulation / decoding unit, it is determined that no content is stored in the first stream data. Including things to do.

  The recording apparatus of the present invention includes a communication unit that communicates with another electronic device, the first stream data and the section data, and the second stream data that are input by the communication unit. And a data storage unit that stores the data in the storage unit.

  Further, in the recording device of the present invention, the reception status detection unit is based on information included in the first stream data and identifying whether the content is stored in the first stream data. And determining whether or not content is stored in the first stream data.

  The recording apparatus of the present invention includes a multiplexing / separating unit that separates the stream data decoded by the demodulation / decoding unit into various monomedia data, and a decoding unit that decodes the monomedia data separated by the multiplexing / separating unit. The reception status detection unit determines that no content is stored in the first stream data when the decoding unit cannot decode the monomedia data separated by the demultiplexing unit. Including.

  With this configuration, it is possible to supplement a missing portion of an elementary stream broadcast on a weak hierarchy with an elementary stream broadcast on a strong hierarchy without using a hierarchy transmission descriptor in terrestrial digital television broadcasting.

  According to the recording device, the recording method, the program, and the data structure of the present invention, a missing portion of an elementary stream broadcast in a weak hierarchy is broadcast in a strong hierarchy without using a hierarchy transmission descriptor in digital terrestrial television broadcasting. Can be supplemented by an elementary stream.

  The recording apparatus according to the embodiment of the present invention will be described below. First, referring to the diagram for explaining the outline of the recording process by the recording apparatus according to the embodiment of the present invention shown in FIG. 1, the outline of the recording process of the digital television broadcast by the recording apparatus according to the embodiment of the present invention. Will be explained.

  The recording apparatus according to the embodiment of the present invention includes a digital television broadcast broadcast using 12 segments (hereinafter referred to as a broadcast in a weak hierarchy) and a digital television broadcast broadcast using one segment. (Hereinafter referred to as “broadcasting in a strong hierarchy”). In addition, broadcasting in the weak hierarchy and broadcasting in the strong hierarchy shall be simulcast (broadcast that distributes the same content at the same time using different broadcasting methods). It is also conceivable to operate so that the same content is not distributed between broadcasts at the higher hierarchy and broadcasts at the higher hierarchy, for example, when the broadcast at the higher hierarchy is output, the text of the telop is enlarged. In this specification, simultaneous broadcasting is defined in a broad sense as broadcasting that distributes content that can be recognized as being the same viewer at the same time. Further, the recording apparatus according to the embodiment of the present invention demodulates the received broadcast in the weak hierarchy or the broadcast in the strong hierarchy to generate a TS (MPEG-2 Transport Stream), and descrambles as necessary. Elementary streams such as video data and audio data, and section data such as PSI (Program Specific Information) and SI (Service Information) are stored.

  In the following description, processing by the recording apparatus according to the embodiment of the present invention will be described by taking an example of digital television broadcasting operated by two layers, a weak layer and a strong layer. Even in the case of digital television broadcasting operated by three layers of strong layers, by using at least two of the three layers, it can be applied to the recording apparatus of the embodiment of the present invention. Can do. Of the three layers, the weak, middle, and strong layers, the same modulation method may be used for the weak and middle layers, but the same modulation method is used for different layers. Even in such a case, the recording apparatus according to the embodiment of the present invention can perform the processing described below for each layer.

  In FIG. 1, the recording apparatus according to the embodiment of the present invention is a TS packet that transmits each section data of PSI / SI including PMT identified by PID (Packet Identifier) “0x02” in broadcasting in a weak hierarchy. And a TS packet identified by the PID specified by the PMT. In broadcasting on a strong hierarchy, a TS packet that transmits each section data of PSI / SI including a PMT identified by PID “0x02”, and a TS packet identified by a PID specified by the PMT, Receive. The recording apparatus first receives a PMT, which is a TS packet for transmitting a PMT, in either a weak layer broadcast or a strong layer broadcast, and separates the TS packet specified by the PID described in the PMT. After receiving, an elementary stream formed by video data, audio data, and other various data included in the TS (in FIG. 1, video data, audio data, and other various data in the broadcast in the weak hierarchy are respectively 12 seg video. ES, 12 seg audio ES, and 12 seg data Section, and video data, audio data, and other various types of data in broadcasting in a strong hierarchy are described as 1 seg video ES, 1 seg audio ES, and 1 seg data Section, respectively). And PMT (in FIG. 1, in broadcasting in a weak hierarchy) MT The 12SegPMT, stores 1segPMT the PMT in the broadcast of a strong hierarchy, and describe.), Respectively.

  When playing back an elementary stream (for example, video data) transmitted by a broadcast in a weak hierarchy, a conventional recording device refers to the stored PMT in the broadcast in the weak hierarchy and stores it. Among the stored elementary streams, the elementary stream identified by the PID “0x0010” is selected and reproduced. Here, if a broadcast in a weak layer and a broadcast in a strong layer are received in a bad reception environment, a TS may not be generated from the broadcast in a weak layer that is weak against transmission errors. . In this case, the recording apparatus continues the storage process in a state where a TS cannot be generated, and can be played back only when there is a defect in the elementary stream (video data) identified by the PID “0x0010”. .

  For this reason, as shown in FIG. 1B, the recording apparatus according to the embodiment of the present invention performs the following PMT in the broadcast in the weak hierarchy during the period when the reception status of the broadcast in the weak hierarchy deteriorates. Rewrite to That is, the recording apparatus rewrites PID “0x0010” in the structure of the PMT in the broadcast on the weak hierarchy to PID “0x1FC8” that identifies the TS packet in the broadcast on the strong hierarchy.

  As a result, the recording apparatus according to the embodiment of the present invention rewrites the elementary stream transmitted by the broadcast in the weak hierarchy without using the hierarchy transmission descriptor in the digital terrestrial television broadcast. Referring to the PMT, an elementary stream transmitted by a broadcast on a weak layer during a period when the reception condition is good, and an element stream transmitted by a broadcast at a strong layer during a period when the reception condition is deteriorated. A mental stream can be reproduced. Hereinafter, the configuration of the recording apparatus according to the embodiment of the present invention and the processing by the recording apparatus will be described in detail.

  FIG. 2 shows the configuration of the recording apparatus according to the embodiment of the present invention. The recording apparatus according to the embodiment of the present invention includes an antenna 201, a tuner unit 202, a demodulation unit 203, a demultiplexing unit 205, a reception status detection unit 206, a simultaneous ES detection unit 207, a PMT conversion unit 208, a data recording unit 209, A recording medium 210, a timer unit 211, and a channel selection unit 212 are included.

  The tuner unit 202 extracts a broadcast signal in the frequency band designated by the control signal from the channel selection unit 212 from the broadcast signal received by the antenna 201, and outputs the broadcast signal to the demodulation unit 203.

  The demodulation unit 203 demodulates the broadcast signal input from the tuner unit 202 to generate a TS (MPEG-2 Transport Stream), and outputs the TS to the demultiplexing unit 205.

  The demultiplexing unit 205 demultiplexes PSI / SI and DSMCC section data from the TS input from the demodulating unit 203 and outputs the section data to the channel selection unit 212, and is assigned the PID indicated by the control signal from the channel selection unit 212. The TS is extracted to separate elementary streams such as video data or audio data, and section data and elementary streams are output to the data recording unit 209, respectively. When the extracted TS is scrambled, the demultiplexing unit 205 performs descrambling as necessary, separates an elementary stream such as video data or audio data, and provides section data and elementary stream Are output to the data recording unit 209, respectively.

  The reception status detection unit 206 monitors the reception intensity of the broadcast signal extracted by the tuner unit 202, and notifies the channel selection unit 212 when the numerical value of the reception intensity changes from less than the threshold value to more than the threshold value.

  The simul ES detection unit 207 receives section data from the channel selection unit 212, identifies broadcasts in weak and strong hierarchies related to simulcast based on the section data, and broadcasts in weak hierarchies. The PMT to be transmitted and the PMT transmitted by broadcasting in a strong hierarchy are output to the channel selection unit 212. The process by which the simul ES detection unit 207 identifies broadcasts in the weak hierarchy and broadcasts in the strong hierarchy that are related to the simulcast will be described later.

  The PMT conversion unit 208 receives, from the channel selection unit 212, a PMT transmitted by a broadcast on a weak layer and a PMT transmitted by a broadcast on a strong layer, which are related to the simulcast, and is transmitted by a broadcast on a weak layer The ES-related information, version information, and CRC of the PMT to be rewritten are output to the data recording unit. The rewriting process of the PMT transmitted by the broadcast in the weak hierarchy by the PMT conversion unit 208 will be described later.

  When the data recording unit 209 receives section data or elementary stream from the demultiplexing unit 205 or PMT from the PMT conversion unit 208, the data recording unit 209 records the data on a recording medium 210 such as an HDD. Note that the data recording unit 209 replaces the PMT input from the PMT conversion unit 208 and stores it in the recording medium 210 when storing the TS input from the demultiplexing unit 205. Also, when storing the elementary stream input from the demultiplexing unit 205, the data recording unit 209 determines the elementary stream to be stored based on the PMT input from the PMT conversion unit 208 and stores it in the recording medium 210. To do.

  In order to detect a section timeout, the timer unit 211 starts counting from the time when the channel selection unit 212 inputs the previous section data from the demultiplexing unit 205, and if the count times a predetermined time, the section has timed out To the tuning unit 212.

  Next, the flow of the recording process performed by the recording apparatus according to the embodiment of the present invention will be described with reference to the flowchart of the recording process performed by the recording apparatus according to the embodiment of the present invention shown in FIG.

  The recording device accepts a recording operation for instructing recording of a broadcast program through an operation panel or the like, or selects a broadcast program designated by the recording operation at a time designated by a previously accepted recording operation. (Step 301). Note that the broadcast program specified by the recording operation is a broadcast program transmitted by broadcasting in a weak hierarchy. Specifically, when the tuning unit 212 instructs the tuner unit 202 to specify a frequency at which a broadcast signal should be received based on the content of the recording operation and a parameter for demodulating a broadcast wave in a weak hierarchy, the tuner unit 202 From the TS generated by receiving the broadcast signal of the frequency, the demodulator 203 demodulates the broadcast signal to generate a TS, and the demultiplexer 205 de-scrambles the TS as necessary. , PSI / SI and DSMCC section data are separated and output to the channel selection unit 212. When the channel selection unit 212 instructs the multiplexing / demultiplexing unit 205 to specify the PID for identifying the TS to be extracted based on the section data and the content of the recording operation, the multiplexing / demultiplexing unit 205 uses the TS packet to which the PID is assigned. And the elementary stream included in the TS packet is output to the data recording unit 209.

  When the recording device extracts the PSI / SI or DSMCC section data from the broadcast in the weak hierarchy, it corresponds to the broadcast program transmitted in the broadcast in the weak hierarchy selected in step 301 based on the section data. Then, a broadcast program transmitted by broadcasting in a strong hierarchy is detected (step 302). The details of the processing in step 302 will be described with reference to the flowchart shown in FIG. 4 at the time of simultaneous ES detection by the recording apparatus according to the embodiment of the present invention.

  When the section selection unit 212 inputs the section data from the demultiplexing unit 205, the channel selection unit 212 extracts the PMT included in the section data (step 401), and also extracts the EIT (Event Information Table) included in the section data (step 401). 402) and output to the simultaneous ES detector 207. The EIT describes information related to a program, such as a program name, broadcast date and time, and program content, for a broadcast program broadcast in a certain frequency band (a frequency band composed of 13 segments). The EIT includes H-EIT, M-EIT, and L-EIT. The H-EIT is information related to a program transmitted by a broadcast in a weak hierarchy, and the M-EIT is transmitted by a broadcast in a middle hierarchy. Information relating to the program, and information relating to the program transmitted in the broadcast on the strong hierarchy are described in the L-EIT. In a frequency band composed of 13 segments, when broadcasting is performed in a plurality of layers, for example, when broadcasting is performed in three layers, H-EIT and M-EIT are performed in broadcasting in each layer. , L-EIT is transmitted by separate TS packets (H-EIT PID is “0x0012”, M-EIT PID is “0x0026”, L-EIT PID is “0x0027”).

  When the simal ES detection unit 207 receives an EIT from the channel selection unit 212 that selects a broadcast in a weak hierarchy, the presence / absence of M-EIT or L-EIT and the presence of M-EIT or L-EIT By determining whether the program information described therein matches the program information described in the H-EIT (for example, whether the program names match) (step 403), the simulcast in the same frequency band It is determined whether or not broadcasting in a related middle or strong hierarchy is being carried out. If the simultaneous ES detection unit 207 determines that the program information described in the M-EIT or L-EIT matches the program information described in the H-EIT (step 403, Y), the channel selection unit 212 is notified of the hierarchy related to the simulcast. On the other hand, in the process of step 403, the simultaneous ES detection unit 207 determines that the program information described in the M-EIT or L-EIT does not match the program information described in the H-EIT (step 403). , N), that the PMT of the primary service is acquired.

  When the channel selection unit 212 is notified of the layer related to the simulcast by the simul ES detection unit 207, the channel selection unit 212 instructs the tuner unit 202 to demodulate the broadcast wave in the layer, and as a result, The section data transmitted in the broadcast is input from the demultiplexing unit 205. The channel selection unit 212 extracts the PMT from the section data transmitted in the broadcast on the hierarchy (step 404), and the previously extracted PMT (PMT transmitted in the broadcast on the weak hierarchy) And the PMT extracted this time (PMT transmitted in broadcasting in a layer below the weak layer) (step 405), and output to the PMT converting unit 208. In addition, when notified from the simul ES detection unit 207 that the PMT of the primary service is acquired, the channel selection unit 212 instructs the tuner unit 202 to set a parameter for demodulating a broadcast wave in a strong hierarchy. Section data transmitted in broadcasting in a strong hierarchy is input from the demultiplexing unit 205. The channel selection unit 212 extracts the PMT of the primary service transmitted in the broadcast on the strong hierarchy (step 406), and the previously extracted PMT (PMT transmitted in the broadcast on the weak hierarchy) and this time The extracted PMT (the PMT of the primary service transmitted in the broadcast on the higher hierarchy) is associated (step 405) and output to the PMT conversion unit 208. The recording apparatus according to the embodiment of the present invention executes the above-described simultaneous ES detection process described with reference to the flowchart of FIG.

  When the recording apparatus starts receiving a broadcast program transmitted by broadcasting in a weak hierarchy, whether the reception state detection unit 206 can synchronize RF by the tuner unit 202 or is output from the tuner unit 202. Whether the reception state is good or worse is determined according to whether the parameter indicating the reception intensity such as the C / N value or BER is equal to or greater than a certain threshold (step 303). If the reception status detection unit 206 notifies the channel selection unit 212 that the reception state has deteriorated (step 303, Y), the channel selection unit 212 instructs the PMT conversion unit 208 to rewrite the PMT transmitted by the broadcast in the weak hierarchy. To do.

  Further, when the channel selection unit 212 is notified from the timer unit 211 that the predetermined time has been counted from the time when the PMT transmitted by the broadcast in the weak hierarchy was previously input from the demultiplexing unit 205 (step 304, Y ), The PMT conversion unit 208 is instructed to rewrite the PMT transmitted by the broadcast in the weak hierarchy. On the other hand, before timing a predetermined time from the time when the PMT transmitted by the broadcast in the weak hierarchy is previously input from the demultiplexing unit 205 (step 304, N), the PMT transmitted by the broadcast in the weak hierarchy is multiplexed. If the PMT version is input again from the conversion / separation unit 205 (the channel selection unit 212 can identify the PMT version by the version_number described in the PMT), the process proceeds from step 302 to step 304. Repeat the process.

  In addition, the channel selection unit 212 determines whether data is stored in the elementary stream input from the demultiplexing unit 205 (the channel selection unit 212 stores data if NULL is stored in the elementary stream). It is determined whether or not the elementary stream can be decoded (step 306). When the channel selection unit 212 determines that no data is stored in the elementary stream or that the elementary stream is not decodable (step 306, Y), rewriting of the PMT transmitted by the broadcast in the weak layer Processing is instructed to the PMT conversion unit 208.

  Subsequently, regarding the rewriting process of the PMT transmitted by the broadcast in the weak hierarchy by the PMT conversion unit 208, the data structure of the PMT shown in FIG. 5 and the recording device of the embodiment of the present invention shown in FIG. This will be described with reference to a flowchart for rewriting the PMT according to FIG.

  When the PMT conversion unit 208 is instructed by the channel selection unit 212 to execute the rewriting process of the PMT transmitted in the broadcast on the weak layer, according to the reception intensity of the broadcast wave on the weak layer notified together with the instruction, The data after the first loop in the PMT (that is, the first repeated description portion in the data structure of the PMT shown in FIG. 5) is converted, or the second loop in the PMT (that is, in the data structure of the PMT shown in FIG. 5). , The first repeated description part in the first loop.) Select whether to convert the subsequent data (step 601).

  When the PMT conversion unit 208 selects to convert the first loop in the PMT (step 601, Y), the data of the first loop in the PMT transmitted in the broadcast in the weak layer is converted into the layer in the strong layer. The data is converted into the data of the first loop in the PMT transmitted in broadcasting (step 602). On the other hand, when the PMT conversion unit 208 selects to convert the second loop in the PMT (step 601, N), the first second loop (the second loop when the variable i in the for statement is i = 0) The description is read (step 603), and it is determined whether or not the elementary stream specified by the read elementary_PID of the second loop is reproducible (for example, whether or not the elementary stream can be decoded). 604). If the PMT conversion unit 208 determines that playback is not possible (step 604, N), the description of the corresponding second loop is changed to the second loop of the PMT (for sentence of the for sentence) transmitted in the broadcast on the strong layer. The variable i is replaced with the description of the second loop when i = 0 (step 605).

  When the processing of step 605 replaces the second loop of the PMT transmitted in the broadcast on the weak layer, the copy control information described in the first loop of the PMT transmitted in the broadcast on the strong layer The descriptor information may be omitted if it is a simple loop replacement. For this reason, the PMT transmitted in the broadcast on the strong hierarchy is analyzed by the process of step 606 described below, and the necessary descriptor is added to the PMT transmitted in the broadcast on the strong hierarchy. . FIG. 7 shows a flowchart when the PMT second loop descriptor is converted by the recording apparatus according to the embodiment of the present invention.

  The PMT conversion unit 208 acquires the descriptor information described in the first loop of the PMT transmitted in the broadcast on the strong layer (step 701), and then the first loop of the PMT transmitted by the broadcast on the strong layer The descriptor information of the second loop is added to the descriptor information described in (1). If there is a descriptor of the same type, the first loop descriptor is deleted and only the second loop descriptor is stored (step 702).

  The PMT conversion unit 208 checks each descriptor that is not different from the currently replaced descriptor with respect to all the descriptors obtained above (step 703). If there is no difference, the PMT second loop descriptor is obtained. End conversion. On the other hand, if there is a difference from the currently replaced descriptor, the descriptor to be investigated is changed to the next descriptor (step 704), and the descriptor already being investigated in the loop of the corresponding elementary stream in the second loop. It is determined whether or not the same descriptor is described (step 705). If the same descriptor is described, the PMT conversion unit 208 does not describe the same descriptor in the first loop of the PMT transmitted in the broadcast in the weak hierarchy, or is different from the first loop. It is determined whether the same descriptor is described in the information (step 706). If the same descriptor is not described, the PMT conversion unit 208 adds the descriptor under loop investigation of the corresponding elementary stream in the second loop (step 707). The recording apparatus according to the embodiment of the present invention executes the second loop descriptor conversion process described above with reference to the flowchart of FIG.

  Thereafter, the PMT conversion unit 208 determines whether or not the descriptions of all the second loops (second loops in which the variable i of the for statement is i = 0 to i = N−1) have been read (step 607). If not read, the description of the next second loop is read (step 8), and the processing from step 604 to step 608 described above is repeated. If the PMT conversion unit 208 determines that the descriptions of all the second loops (the second loop in which the variable i of the for statement is i = 0 to i = N−1) have been read (step 607, Y), the video data Alternatively, the process proceeds to a process of determining whether or not the PID of the elementary stream of audio data has been replaced (step 609).

  If the PID of the elementary stream of video data or audio data has been replaced (step 609, Y), the PMT conversion unit 208 converts the PCR_PID of the PMT transmitted in the weak hierarchy broadcast in the strong hierarchy broadcast. It is changed to PCR_PID of the transmitted PMT (step 610).

  Also, the PMT conversion unit 208 updates the version_number indicating the version of the PMT transmitted in the broadcast in the weak hierarchy, whether or not the PID of the elementary stream of video data or audio data is replaced. (Step 611) Further, CRC calculation is performed, and CRC_32 is updated with the calculated value (Step 612).

  As described above, in the recording apparatus according to the embodiment of the present invention, the broadcast in the weak hierarchy is used without using the hierarchy transmission descriptor in the digital terrestrial television broadcast during the period when the reception situation in the broadcast in the weak hierarchy is deteriorated. The PMT description in is replaced with the PMT description in broadcasting in the strong hierarchy. As a result, when an elementary stream transmitted by a broadcast in a weak hierarchy is played back, the reception status is good with reference to the rewritten PMT without using a hierarchy transmission descriptor in digital terrestrial television broadcasting. An elementary stream transmitted by broadcasting in the weak hierarchy can be reproduced during a certain period, and an elementary stream transmitted by broadcasting in the strong hierarchy can be reproduced during a period when the reception status is deteriorated.

  The recording apparatus according to the embodiment of the present invention described so far rewrites the PMT transmitted in the broadcast in the weak hierarchy while receiving the broadcast in the weak hierarchy. As another method, it is possible to record a broadcast in a weak hierarchy without rewriting the PMT, and then rewrite the PMT before reproducing the recorded broadcast in the weak hierarchy. . In the flowchart of FIG. 4 described above, the channel selection unit 212 receives section data transmitted from the demultiplexing unit 205 in the weak layer broadcast and the strong layer broadcast, respectively, and the simul ES detection unit 207 receives the simul relationship. In order to realize the above-described another method, the channel selection unit 212 transmits each of the broadcast in the weak hierarchy and the broadcast in the strong hierarchy stored in the storage medium 210. The section data may be input. With this configuration, means (for example, a recording medium such as a memory card) for exchanging data with other electronic devices even if the recording device does not receive the digital television broadcast for recording. Digital television broadcast data acquired via an interface for reading data from the Internet, a communication interface for communicating with other electronic devices, or a communication interface for connecting to the Internet network) is also broadcast in a weak hierarchy. The missing part of the elementary stream can be supplemented by an elementary stream broadcast on a strong hierarchy.

  According to the recording device, the recording method, the program, and the data structure of the present invention, a missing portion of an elementary stream broadcast in a weak hierarchy is broadcast in a strong hierarchy without using a hierarchy transmission descriptor in digital terrestrial television broadcasting. This is advantageous in that it can be supplemented by an elementary stream to be recorded, and is useful in the field related to a recording apparatus capable of recording digital television broadcasts.

The figure explaining the outline | summary of the video recording process by the video recording apparatus of embodiment of this invention Configuration of recording apparatus according to embodiment of the present invention Flowchart at the time of recording processing by the recording apparatus according to the embodiment of the present invention Flowchart at the time of simultaneous ES detection by the recording apparatus of the embodiment of the present invention Data structure of PMT Flowchart at the time of rewriting of PMT by the recording apparatus of the embodiment of the present invention Flowchart at the time of PMT second loop descriptor conversion by the recording apparatus of the embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 201 Antenna 202 Tuner part 203 Demodulation part 205 Demultiplexing part 206 Reception condition detection part 207 Simultaneous ES detection part 208 PMT conversion part 209 Data recording part 210 Recording medium 211 Timer part 212 Channel selection part

Claims (10)

First stream data to which a first identifier is assigned, section data specifying at least the first identifier of the first stream data, transmitted in a first layer, and the first layer, A storage unit for storing second stream data to which a second identifier having a relationship with the first identifier and the simulcast is transmitted, transmitted in a second layer having a different layer;
A reception status detector that determines whether or not content is stored in the first stream data;
When the reception status detection unit determines that no content is stored in the first stream data, the section data in which the first identifier is replaced with the second identifier is stored in the storage unit A PMT conversion unit;
A recording apparatus comprising: The recording device according to claim 1,
A receiver for receiving digital television broadcast waves;
A stream obtained by demodulating and decoding the first digital television broadcast wave transmitted in the first layer or the second digital television broadcast wave transmitted in the second layer, received by the receiving unit. A demodulation and decoding unit for outputting data;
A data storage unit for storing the first stream data and the section data, and the second stream data included in the stream data output from the demodulation and decoding unit in the storage unit;
A recording apparatus comprising: The recording device according to claim 2,
The reception status detection unit determines that no content is stored in the first stream data when the reception intensity received by the reception unit is smaller than a threshold value.
Recording device. The recording device according to claim 2,
The reception status detection unit determines that no content is stored in the first stream data when the demodulation and decoding unit cannot decode the first digital television broadcast wave.
Recording device. The recording device according to claim 1,
A communication unit for communicating with other electronic devices;
A data storage unit for storing the first stream data and the section data and the second stream data input by the communication unit in the storage unit;
A recording apparatus comprising: The recording apparatus according to any one of claims 1, 2, and 5,
The reception status detection unit includes a content in the first stream data based on information included in the first stream data and identifying whether the content is stored in the first stream data. Determine whether it is stored,
Recording device. The recording apparatus according to any one of claims 1, 2, or 5,
A demultiplexing unit that separates the stream data decoded by the demodulation decoding unit into various monomedia data;
A decoding unit for decoding the monomedia data separated by the demultiplexing unit;
The reception status detection unit determines that no content is stored in the first stream data when the decoding unit cannot decode the monomedia data separated by the demultiplexing and demultiplexing unit.
Recording device. First stream data to which a first identifier is assigned, section data specifying at least the first identifier of the first stream data, transmitted in a first layer, and the first layer, Stores the second stream data to which the second identifier having a relationship of the simulcast and the first identifier, which is transmitted in a second layer having a different layer, is assigned,
Determining whether content is stored in the first stream data;
When it is determined that no content is stored in the first stream data, the section data in which the first identifier is replaced with the second identifier is stored.
Recording method.   The program for making a computer perform the procedure of Claim 8.   The first identifier assigned to the first stream data transmitted in the first layer is assigned to the second stream data transmitted in the second layer different from the first layer, A section data structure that can be replaced with a second identifier that has a relationship with the first identifier and simulcast.

Images