JP2011155374A - Video recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video recording device that reduces a load of a memory capacity, and facilitates holding program information when recording PSI (Program Specific Information) or SI (Service Information) information in regard to program data. <P>SOLUTION: The video recording device, which extracts packets of a video recording object program from a transport stream superimposed with a plurality of data and records them in the memory, includes an information extractor which extracts only information relating to the recording object program out of an NIT (Network Information Table), an SDT (Service Description Table), and an EIT (Event Information Table) which are superimposed on the transport stream and a recorder which records the extracted information in the memory. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a recording apparatus, and more particularly to a recording apparatus capable of recording a TS in which data is multiplexed.

  In a transport stream (hereinafter referred to as TS) transmitted by digital broadcasting, information such as PSI (Program Specific Information) and SI (Service Information) is superimposed in addition to video packets and audio packets. The PSI and SI are composed of data indicating the position of the video packet and the audio packet on the TS, and data indicating the program contents, etc. When the receiving apparatus receives the TS, the video data and the audio packet are recorded on the TS. Is determined using the PSI and SI, and the packet is acquired.

  In addition, a technique for extracting and recording only the PSI and SI related to the recording target program from the PSI and SI is disclosed (for example, see Patent Documents 1-4).

JP 2004-055116 A JP 2003-153220 A JP 2002-290999 A JP 2002-141877 A

  In the case of recording a program, the PSI and SI information described above includes information that is not closely related to the recording target program. However, the conventional technique does not disclose a specific method for selecting information closely related to the recording target program, and it has been difficult to hold the information while reducing the load on the memory capacity.

  The present invention has been made in view of the above-described problems. When recording PSI and SI information related to program data, the present invention provides a recording apparatus capable of easily holding program information by reducing the load on the memory capacity. For the purpose of provision.

  In order to solve the above-described problem, in the present invention, in a recording apparatus that extracts a packet of a recording target program from a transport stream on which a plurality of data is superimposed and records it in a memory, the NIT superimposed on the transport stream, Among the SDT and EIT, there is provided an information extracting means for extracting only information related to a recording target program, and a recording means for recording the extracted information in the memory.

In the invention configured as described above, the information extraction unit extracts only information related to the recording target program from the NIT, SDT, and EIT superimposed on the transport stream, and the recording unit extracts the extracted information. Information is recorded in the memory.
For this reason, when recording a program to be recorded in the memory, only information closely related to the program is recorded, so that the load on the memory capacity can be reduced and the program information can be easily held.

In addition, as an example of a configuration in which each information extraction unit extracts each information, the information extraction unit extracts information related to the recording target program based on a table ID recorded in NIT and SDT, The EIT may be configured to extract information related to the recording target program based on the table ID, service ID, and running status or time information.
In the invention configured as described above, since the information is selected using the existing table ID or the like, the present invention can be realized by a simple process using the existing information.

  As an example of a method in which the information extraction unit selects EIT information, the information extraction unit includes a transport stream included in the EIT based on the table ID in which a packet related to a recording target program is superimposed. EIT_present / following indicating program information of the currently broadcasted program and the next broadcasted program is extracted, and EIT_present / following of the same channel as the recording target program based on the service ID is extracted from the extracted EIT_present / following It is good also as a structure which extracts information relevant to a video recording target program based on the said running status or time information from EIT_present / following of the extracted said same channel.

Further, the recording unit may generate a partial TS by combining the extracted information, a video packet and an audio packet in a recording target program, and record the partial TS in the memory.
Here, the partial TS means a TS obtained by synthesizing information related to a recording target program in PSI and SI, and a video packet and an audio packet of the recording target program, and is transmitted by a broadcast wave. The amount of information of PSI and SI is deleted as compared with FIG.
In the invention configured as described above, corresponding information and video / audio packets to be recorded are recorded as simple TSs in the memory, so that data can be easily accessed.

  As another aspect of the present invention, the information extraction means extracts information related to a recording target program based on a table ID recorded in NIT and SDT, and in EIT, Based on the ID, extract EIT_present / following indicating program information of the currently broadcasted program and the next broadcasted program in the transport stream in which the packet related to the recording target program is superimposed, which is included in the EIT, and is extracted. Based on the service ID, the EIT_present / following of the same channel as the recording target program is extracted from the EITpresent / following, and the running status or time information is extracted from the extracted EIT_present / following of the same channel. Information relating to the program to be recorded is extracted, and the recording means includes the extracted information, Generates a partial TS by combining the video packets and audio packets in image target program may be recorded this partial TS to the memory.

As described above, according to the present invention, when recording a program to be recorded in a memory, only information closely related to the program is recorded, so that the program information can be easily held by reducing the load on the memory capacity. Can do.
Further, according to the inventions according to claims 2 and 3, since the information is selected using the existing table ID or the like, the present invention can be realized by a simple process using the existing information.
According to the invention of claim 4, data can be easily accessed.

1 is a block diagram for explaining the configuration of a media player 100. FIG. It is a figure for demonstrating each data superimposed on TS. It is a figure explaining the process in which the partial TS is produced | generated from TS by the control part 94. FIG. 4 is a flowchart for explaining processing executed by the media player 100 during recording. It is a flowchart explaining the process performed in step S3 of FIG.

Embodiments of the present invention will be described below in the following order with reference to the drawings.
1. First embodiment:
2. Second embodiment:
3. Other embodiments:

1. First embodiment:
Hereinafter, a first embodiment of a recording apparatus according to the present invention will be described with reference to the drawings. In the first embodiment, the recording apparatus will be described based on a media player.

  FIG. 1 is a block diagram for explaining the configuration of the media player 100. The media player 100 is a device for recording a digital broadcast received by an antenna or a video signal and an audio signal acquired through an external terminal (not shown) on a recording medium. The media player according to the present embodiment includes at least an operation input I / F 90, a tuner unit 91, a descramble unit 92, a transport decoder 93, a control unit 94, an AV decoder 95, a memory controller 96, and a recording memory 97. It is configured with.

  The operation input I / F 90 receives an operation input input through a remote controller (not shown), converts the operation input into a form that can be received by the control unit 94, and outputs the converted input.

  The tuner unit 91 extracts a desired modulation signal from the broadcast signal received by the antenna, and then analog-digital converts this signal to extract a TS (transport stream).

  The descrambling unit 92 releases the scramble of the TS based on the key information recorded on the B-CAS card or the like.

  The transport decoder 93 superimposes the scrambled TS on the video packet ES (V) and audio packet ES (A), PSI information (PAT, PMT, NIT, CAT), SI information (SDT, EIT, BAT, TOT) packets are extracted.

  FIG. 2 is a diagram for explaining each data superimposed on the TS. As shown in FIG. 2, a plurality of TSs (TS1 to TS3) are conveyed by broadcast waves, and at least one PAT, PMT, and NIT are superimposed as one PSI, and one PDT, SDT, and EIT are superimposed as one PSI, Further, ES (A) is superimposed on the video packet ES (V) and the audio packet. Each packet is given a PID (Packet Identification) for specifying its position. Since the PID acts as a serial number indicating each piece of information transmitted in the TS, the same PID is attached to the same packet. Hereinafter, each information superimposed on TS will be described.

A PAT (Program Association Table) is a table showing a correspondence between a service (program) provided by a certain TS and the PID of the PMT.
The PMT (Program Map Table) is a table showing the correspondence between the video / audio packets constituting the service and the PIDs of the video / audio packets for each service.
In the NIT (Network Information Table), services in all TSs and service descriptors that are service type information are recorded. For example, since services in all TSs are recorded in the NIT, the NIT in a network including a program to be recorded (hereinafter referred to as the NIT of its own network) and the NIT in other networks are included. Each NIT can be identified by a table ID.

In SDT (Service Description Table), program information names and the like of services provided by all TSs are recorded. For example, the SDT includes a TS on which a program to be recorded is superimposed (hereinafter referred to as an SDT of the own TS) and an SDT of another TS, and each SDT can be identified by a table ID.
In an EIT (Event Information Table), event information of services provided by the TS is recorded. In EIT, EIT_present / following (hereinafter referred to as EIT_p / f) that provides information on the currently broadcasted program and the next broadcasted program in all TSs, and program information for several days is provided. EIT_scheduled (hereinafter referred to as EIT_sch) exists. For example, EIT_p / f and EIT_sch each include a TS on which a program to be recorded is superimposed (hereinafter referred to as an EIT of the own TS) and an EIT of another TS, and each EIT is identified by a table ID. Is possible. Each EIT can identify the target CH by the service ID, and can identify its contents by an RST (Running Status Table) indicating the progress of the program and a TDT (Time Data Table) indicating the current time. Is possible.

  The control unit 94 controls the drive of the media player in accordance with the operation input input through the operation input I / F 90 and a predetermined program. The control unit 94 includes a CPU that performs predetermined calculations, a ROM that stores programs and data for the CPU to perform calculations, and a RAM that functions as a work memory for the CPU.

  FIG. 3 is a diagram illustrating a process in which a partial TS is generated from a TS by the control unit 94. The CPU realizes each function of the NIT conversion unit 80, the SDT conversion unit 81, the EIT conversion unit 82, and the partial TS generation unit 83 by executing a program recorded in the ROM when recording video data and audio data. To do.

  The NIT conversion unit 80 extracts only information related to the video / audio packet to be recorded from the NIT extracted from the TS. Since the NIT superimposed on the TS includes the NIT of the own network and the NIT of other networks, the NIT conversion unit 80 extracts only the NIT of the own network with reference to the table ID.

  The SDT conversion unit 81 extracts only information related to video / audio packets to be recorded from the SDT extracted from the TS. Since the SDT superimposed on the TS includes the SDT of the own TS and the SDT of the other TS, the SDT conversion unit 81 extracts only the SDT of the own TS that is the superposition source with reference to the table ID.

  The EIT conversion unit 82 extracts only information related to the video / audio packets to be recorded from the EIT extracted from the TS. The SDT conversion unit 81 extracts only program information related to the recording target program from the EIT with reference to the table ID, the service ID, and further the RST and TDT. With the above configuration, the control unit 94 realizes a function as information extraction means according to the present invention.

  The partial TS generation unit 83 generates a partial TS based on the information extracted by the NIT conversion unit 80, the SDT conversion unit 81, and the EIT conversion unit 82, and the video / audio packet. This partial TS is a TS generated by superimposing a video / audio packet and NIT, SDT, and EIT related to the video / audio packet. Compared to the TS extracted by the tuner unit 91, the NIT, SDT , Each information amount of EIT is reduced. With the above configuration, the information corresponding to the recorded program and the recording target data are recorded as a simple TS in the recording memory 97, so that the data can be easily accessed. With the above configuration, the control unit 94 realizes a function as a recording unit according to the present invention.

  In the playback operation of the media player 100, the AV decoder 95 generates a video composite signal from the video data and audio data recorded in the recording memory 97, and outputs the video composite signal to the display device.

  The memory controller 96 functions as an interface for recording the partial TS in the recording memory 97 according to a command from the control unit 94. In addition, the recording memory 97 according to the present embodiment is configured by an HDD or a Blu-ray disc.

=== About processing in video recording ===
FIG. 4 is a flowchart for explaining processing executed by the media player 100 during recording. The process shown in FIG. 4 is a process executed when the user causes the media player 100 to record a predetermined program.

  When a recording command is input to the control unit 94 via the operation input I / F 90, in step S1, the control unit 94 causes the video packet ES (V), audio packet ES (A), PSI, and SI of the recording target program. Is identified. Specifically, the control unit 94 extracts each program information of the recording target program from the NIT, SDT, and EIT extracted from the TS. In addition, the control unit 94 acquires the PMT related to the recording target program from the PAT based on the service ID recorded in the extracted NIT. And the control part 94 specifies the position in TS of video packet ES (V) audio | voice packet ES (A) from acquired PMT.

  In step S2, the control unit 94 extracts the video packet ES (V) and audio packet ES (A) of the identified recording target program from the TS. The extracted video packet ES (V), audio packet ES (A), and each information are temporarily stored in the RAM in the control unit 94.

  In step S3, the control unit 94 extracts only information corresponding to the video packet ES (V) and audio packet ES (A) of the recording target program extracted in step S2 from the PSI information and SI information stored in the RAM. To do.

  FIG. 5 is a flowchart illustrating the process executed in step S3 of FIG. In step S11, the NIT conversion unit 80 refers to the table ID and extracts the NIT of its own network in the NIT. In other words, the NIT conversion unit 80 extracts the NIT with the table ID “0x40” as the NIT of its own network.

  In step S12, the SDT conversion unit 81 extracts the SDT of the self TS in the SDT with reference to the table ID. That is, the SDT conversion unit 81 extracts the SDT having the table ID “0x42” as the SDT of its own ST.

  In step S13, the EIT conversion unit 82 refers to the table ID and extracts the EIT_p / f of the currently broadcast program of the own TS and the next broadcast program in the EIT. In step S14, the EIT conversion unit 82 refers to the service ID and extracts EIT_p / f of the same channel as the recording target program from EIT_p / f in the own TS.

  In step S15, the EIT conversion unit 82 refers to TDT or RST and extracts information recorded in EIT_p / f as EIT related to the recording target program. That is, when TDT is used, the control unit 94 determines information related to the currently broadcast program recorded in EIT_p / f based on the recording time, and extracts this information as information related to the recording target program. To do.

  Returning to step S4 in FIG. 4, the partial TS generation unit 83 performs the PSI information and SI information extracted in step S3, and the video packet ES (V) and audio packet ES (A of the recording target program extracted in step S2. ) To generate a partial TS.

  In step S <b> 5, the control unit 94 records the generated partial TS at a predetermined address in the recording memory 97. Therefore, the control unit 94 controls the memory controller 96 to record the partial TS at a predetermined address in the recording memory. Note that the processing in steps S1 to S5 is repeated until all packets in the recording target program are received (step S6).

As described above, in the media player 100 according to the present embodiment, the control unit 94 extracts only information related to the recording target program from the NIT, SDT, and EIT superimposed on the TS, and the extracted information Is recorded in the recording memory 97, only the information closely related to this program is recorded in the recording memory 97, and the program information can be easily held by reducing the load of the memory capacity.
Further, even when program recording is divided by time, it is possible to hold information that is closely related to each recorded program.

2. Second embodiment:
In step S1 in FIG. 4, the recording command input to the control unit 94 is not limited to information specified for recording a specific program, and may be information specifying a recording time. For example, in the case where the recording time is designated as PM 7:00 to PM 9:00 in an arbitrary channel, and two programs are broadcast within this time, the control unit 94 is related to each NIT, A configuration may be adopted in which information on SDT and EIT is extracted to generate a partial TS.

3. Other embodiments:
There are various embodiments of the present invention.
For example, the use of a media player as a specific example of the recording device is an example, and a display device (television receiver) having a recording function may be used.

Needless to say, the present invention is not limited to the above embodiments. It goes without saying for those skilled in the art,
・ Applying mutually interchangeable members and configurations disclosed in the above embodiments by appropriately changing the combination thereof.− Although not disclosed in the above embodiments, it is a publicly known technique and the above embodiments. The members and configurations that can be mutually replaced with the members and configurations disclosed in the above are appropriately replaced, and the combination is changed and applied. It is an embodiment of the present invention that a person skilled in the art can appropriately replace the members and configurations that can be assumed as substitutes for the members and configurations disclosed in the above-described embodiments, and change the combinations and apply them. It is disclosed as.

  80 ... NIT conversion unit, 81 ... SDT conversion unit, 82 ... EIT conversion unit, 83 ... partial TS generation unit, 90 ... operation input I / F, 91 ... tuner unit, 92 ... de-scramble unit, 93 ... transport decoder 94 ... Control unit, 95 ... AV decoder, 96 ... Memory controller, 97 ... Recording memory, 100 ... Media player

Claims (5)

In a recording device that extracts a packet of a recording target program from a transport stream on which a plurality of data is superimposed and records it in a memory,
Information extracting means for extracting only information related to a recording target program from NIT, SDT, and EIT superimposed on the transport stream;
And a recording means for recording the extracted information in the memory. The information extraction means includes
In NIT and SDT, information related to the recording target program is extracted based on the table ID recorded inside,
2. The recording apparatus according to claim 1, wherein in the EIT, information related to a recording target program is extracted based on a table ID, a service ID, a running status, or time information. The information extraction means includes
Based on the table ID, EIT_present / following indicating program information of the currently broadcasted program and the next broadcasted program in the transport stream in which the packet related to the recording target program is superimposed is extracted. ,
From the extracted EIT_present / following, EIT_present / following of the same channel as the recording target program is extracted based on the service ID,
The recording apparatus according to claim 2, wherein information related to a recording target program is extracted based on the running status or time information from the extracted EIT_present / following of the same channel.   2. The recording unit according to claim 1, wherein the extracted information is combined with video packets and audio packets in a recording target program to generate a partial TS, and the partial TS is recorded in the memory. The recording device according to claim 3. The information extraction means includes
In NIT and SDT, information related to the recording target program is extracted based on the table ID recorded inside,
In the EIT, EIT_present / indicating program information of a currently broadcasted program and a program to be broadcast next in a transport stream in which packets relating to a recording target program included in the EIT are superimposed based on the table ID. extract following
From the extracted EIT_present / following, EIT_present / following of the same channel as the recording target program is extracted based on the service ID,
From the extracted EIT_present / following of the same channel, extract information related to the recording target program based on the running status or time information,
2. The recording unit according to claim 1, wherein the extracted information is combined with video packets and audio packets in a recording target program to generate a partial TS, and the partial TS is recorded in the memory. The recording device described in 1.

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