JP2002198925A - Device and method for receiving data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform filtering of more detailed content data, in a device for receiving data. SOLUTION: With reception of a data stream such that a content information identifier is added to the top of access unit of content data, a new filtering function using the content information identifier is added besides filtering function using the traditional PID. Identifier interpretation data brought multiplexed with content data is recorded, after received, in an identifier interpretation data means. In a content filtering means, a filtering of content data containing required information is performed based on the identifier interpretation data recorded in the identifier interpretation data means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving apparatus having a function of filtering content data containing specific information from transmitted data.

[0002]

2. Description of the Related Art A multiplexed signal of digital broadcasting is based on a packet multiplexing system and conforms to the ISO / IEC13818-1 (MPEG2 System) standard. FIG. 3 shows a process of multiplexing content data. The component signal of the service is encoded by the information source encoding unit 30 to form an elementary stream (ES). After digitally encoding the components of the service, the data grouping unit 31
The PES packet is divided into convenient units for posting and encoding information as viewed from the service side, and a header is added to this unit to form a PES packet.

[0003] Next, the transmission packetizer 32 divides the variable-length data group signal into short data having a fixed length so as to be easily multiplexed without depending on the signal content when viewed from the transmission side.
A transport stream packet (TS packet) is formed by adding a header to this. The header of the TS packet has a packet ID (PID) for identifying the packet, and the receiving device identifies the service and each component constituting the service using the PID. Therefore, it is possible to manage the information of the content data for each PID. Finally, a plurality of TS packets are multiplexed by the packet multiplexing unit 33 to form and transmit a transport stream (TS).

FIG. 9 shows a conventional receiving apparatus for filtering content data in PID units from transmitted data. The conventional receiving device 90 includes a data receiving unit 91, a PID interpretation data requesting unit 92, a PID filtering unit 93, a PID interpretation data recording unit 94, a program identification request conversion unit 95, a filtering result storage unit 9
6 is provided. The data receiving unit 91 has a T including a PID in the header.
Receives content data divided into S packets. P
The ID interpretation data requesting unit 92 requests the PID filtering unit to filter the PID interpretation data storing the content data information in PID units, and the filtered PID interpretation data is recorded in the PID interpretation data recording unit 94. The PID interpretation data will be described in detail later.

The program identification request conversion unit 95 converts a program identification request from outside the receiver into a PID interpretation data format (PID designation) based on the PID interpretation data recorded in the PID interpretation data recording unit, and requests filtering. Notify the PID filtering unit 93 of the PID of the program to be executed. The PID filtering unit 93 receives the notification from the program identification request conversion unit 95 and filters the TS packet including the requested PID. The content data in PID units filtered by the PID filtering unit 93 is stored in the filtering result storage unit 96.

Here, an example of PID interpretation data is shown in FIG. The three TS packets shown in FIG. 4 respectively store three types of programs, “news”, “soccer relay”, and “song program”, and these TS packets form one transport stream (TS). ). Normally, an individual PID is assigned to each TS packet including each program, and a conventional receiving apparatus 90 having only a filtering function based on the PID is used.
Can identify these programs.
In the example, PID = 101 for "News" and PI for "Live Soccer"
P = 103 is assigned to D = 102 and “song program”, respectively.

[0007] The PID interpretation data 5 shown in FIG. 5 manages the program contents included in the TS packet for each PID. For example, when filtering of a "song program" is requested from outside the receiver, a program identification request is issued. The conversion unit converts the packet into a filtering request for the TS packet of “PID = 103”. The PID filtering unit 93 filters the TS packet 42 of PID = 103, and
Acquire the content data (song program) included in the TS packet.

[0008]

Since the conventional receiving apparatus 90 has only a filtering function based on the PID, in order to filter content data including specific information from transmitted data, the content data must be transmitted in packets. When configuring the TS packet by the unit 32, the PI of the packet including the data to be filtered is
D must be differentiated. Normally, the PID is assigned to each program, so that only filtering on a program basis is possible. ES with one content data
If the content data consists of
Since the packet is divided into packets having a PID, specific information cannot be filtered. Further, since the PID is a finite ID assigned to each broadcaster, it is not suitable for subdividing the content information of the content data. Furthermore, as described above, since the transmission packetizer 32 divides the content data into variable-length TS packets so as to be easily multiplexed without depending on the signal content, it is difficult to identify the content of the content data in TS packet units. It is.

According to the present invention, the data grouping section 31 divides content data into units convenient for posting information as viewed from the service side and forms a PES packet, which is suitable for identifying the content of the content data. At the time of data grouping, an identifier including content information of content data (hereinafter referred to as a content information identifier) is added, and the content filtering unit 109 that interprets the content information identifier and performs filtering is added. By providing in the receiving device, TS of the same PID
It is possible to filter specific information on content data included in a packet.

[0010] As described above, an object of the present invention is to provide a receiving apparatus having a function of filtering data including specific information from content data to which a content information identifier has been added.

[0011]

According to a first aspect of the present invention, when content data including a content information identifier is received,
The content information identifier is extracted and interpreted, and a mechanism for filtering data containing specific information based on the information is provided. A data receiving unit for receiving data including a PID and a content information identifier, a content identification request conversion unit for associating a content data acquisition instruction with the content information identifier, and a filtering unit for performing filtering based on the PID and the content information identifier. Filter data that contains information. Here, the data received by the data receiving unit further includes identifier interpretation data for retaining the correspondence between the information of the content data acquisition command and the content information identifier, and the content identification conversion unit acquires the content data based on the identifier interpretation data. The instruction is associated with the content information identifier.

According to a second aspect of the present invention, in addition to the first aspect, a content data recording unit for recording content data in PID units is provided, and the content data is received and recorded in advance. Thereafter, when the identifier interpretation data is received, the content data of the content information identifier unit is filtered from the PID unit content data recorded in the content data recording unit in advance.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows a configuration of a receiving apparatus 100 according to Embodiment 1 of the present invention, in which a data receiving section 101 for receiving data and a PID filtering section for performing filtering on a PID basis. 104, the PID of the packet including the identifier interpretation data is specified, the identifier interpretation data requesting unit 102 that requests the filtering of the identifier interpretation data to the PID filtering unit, the PID of the packet including the PID interpretation data is specified, and the identifier is specified in the PID filtering unit. PID interpretation data requesting unit 103 that requests interpretation data filtering, identifier interpretation data recording unit 105 that records identifier interpretation data filtered by PID filtering unit 104, PID that records PID interpretation data filtered by the PID filtering unit
An interpretation data recording unit 106, a program identification request conversion unit 107 that converts a program identification request from outside the receiver into a format of PID interpretation data and requests the PID filtering unit to filter the requested program, and a content identification request from outside the receiver. A content identification request conversion unit 108 that converts the content into an identifier interpretation data format and requests the content filtering unit to filter the requested content, a content filtering unit 109 that performs filtering for each content information identifier, and stores the data filtered by the content filtering unit. It is configured by a filtering result storage unit 110.

The data receiving unit 101 receives a broadcast from outside the receiving device. Digital signal to be received is ISO / IEC13818
-1 to form a transport stream (TS).

Here, an example of a procedure for generating received data including a content information identifier will be described with reference to FIG. The content data (elementary stream: ES) digitally encoded by the information source encoding unit 30 forms a PES packet by the data grouping unit 31.

Here, the configuration of the data grouping section 31 is shown in FIG. The data grouping unit has an ES division unit 60, a header addition unit 61, an identifier generation unit 63, and an identifier assignment unit 62. The ES dividing means 60 divides the ES into convenient units for presenting and encoding information from the service side. The minimum unit at this time is a unit of decoding and reproduction called an access unit.
A frame or one audio frame in MPEG audio. A header is added to the data divided by the ES dividing means 60 by the header adding means 61, and the conventional PES
Make up the packet.

The identifier generating means 63 generates a content information identifier to be described later based on the content of the content data included in each PES packet, and the identifier giving means 62 gives the content information identifier to the conventional PES packet. I do. As an example of a rule for assigning an identifier, a content information identifier is added only when a certain PES packet has a delimiter for identifying as content data (hereinafter, the head of the identification unit), and 10 bytes from the end bit of the PES packet header. Shall be assigned to If there is no head of the identification unit of the content data in the PES packet, 1 from the end bit of the PES packet header
A stuffing byte is assigned to the 0 byte.

FIG. 7 shows details of the content information identifier.
This will be described with reference to FIG. The minimum unit for identifying content data is an access unit, and time stamp information added to each access unit in the PES packet header is used as content identification means. The content information identifier 71 describes a flag assigned to each identification unit of content data and an STC value for the first data of the identification unit of the content data.

When the head of an access unit is included in a certain PES packet, a time stamp (PTS), which is tag information for time management of decoding and reproduction processing attached to each access unit, is added to the PES packet header. Have been. Therefore, this information is described in the content information identifier 71. However, when the head of two or more access units is included in the PES packet, only the PTS corresponding to the first access unit is added to the PES packet header, so the transmitting side is included in the PES packet header. Based on the PTS information, it is necessary to calculate the STC value for the head data of the identification unit of the content data.

The identifier interpretation data is transmitted in a section format, and is divided into TS packets by the transmission packetizing unit 32 in the same manner as a PES packet including a content information identifier, and a PID is added to the header of each TS packet. . The packet multiplexing unit 33 includes the content data
The TS packet and the TS packet including the identifier interpretation data are multiplexed to form one TS. Here, the identifier interpretation data will be described with reference to FIG. Identifier interpretation data 8
Describes a correspondence table between a flag assigned to each identification unit of content data in the content information identifier 71 and the content of each identification unit of the content data. The content content information is transmitted by encoding what the identified content contains (for example, when the content is a song program, a song corner, a CM, a talk corner, etc.), and the receiving device transmits the code. In order to interpret, it is necessary to unify the encoding of the contents.

Here, the flow of the operation of the receiving apparatus proposed in the present invention will be described with reference to the flowchart of FIG. Includes content data with a content information identifier
TS packet, TS packet containing identifier interpretation data and PI
The data receiving unit 101 receives a transport stream (TS) in which TS packets including D interpretation data are multiplexed (S100). Here, when multiplexing a TS packet containing content data with a content information identifier added thereto, a TS packet containing identifier interpretation data, and a TS packet containing PID interpretation data into one TS, the identifier interpretation data
The PID interpretation data needs to be multiplexed so as to be received earlier than the content data.

Note that a TS packet containing content data, a TS packet containing identifier interpretation data, and a TS packet containing PID interpretation data may be individually received. The identifier interpretation data request unit 102 transmits the PID of the TS packet including the identifier interpretation data, and the PID interpretation data request unit 103 transmits the PID of the TS packet including the PID interpretation data to the PID filtering unit 104.
Then, each request is received, identifier interpretation data and PID
The interpretation data is filtered (S101).

The identifier interpretation data requesting unit 102 and the PID interpretation data requesting unit 103 are activated at the same time as the data is received.
A request is sent to the filtering unit 104. In this case, it is assumed that the identifier interpretation data and the PID interpretation data have a fixed PID in advance. The filtered identifier interpretation data and PID interpretation data are recorded in the identifier interpretation data recording unit 105 and the PID interpretation data recording unit 106, respectively.

The program identification request from outside the receiver is PI
Using the PID interpretation data recorded in the D interpretation data recording unit 106, the program identification request conversion unit 107
Converted to D-unit filtering format (S1
02, S103). With reference to FIG. 5, for example,
When song program filtering is requested from outside the receiver, the program identification request conversion unit 107 sends an external request to filter the song program to PID interpretation data 5 to filter data of PID = 103.
Is converted into a request conforming to.

The request converted into the filtering in units of PID is transmitted to the PID filtering unit 104, and the program requested by the PID filtering unit 104 is filtered (S104).

A content identification request from the outside of the receiver is converted to a content identification request conversion unit 108 using the identifier interpretation data recorded in the identifier interpretation data recording unit 105.
Is converted into the format of the identifier interpretation data (S105, S106). Explaining with reference to FIG. 8, for example, when CM filtering is requested from the outside,
The content identification request conversion unit 108 converts an external request to filter a CM into a request in accordance with the identifier interpretation data 8 to filter flag = 2 data.

In the content filtering unit 109, flag = 2 converted by the content identification request converting unit 108
In response to a request to filter data
Receives D-unit content data. By referring to the content information identifier 71 added to 10 bytes from the header end bit of the PES packet including the content data, it is understood that the data of flag = 2 exists at the position of STC = 1500, and the designated data Is performed, and the filtered data is stored in the filtering result storage unit 110 (S107).

In the present embodiment, two filtering units, the PID filtering unit 104 and the content filtering unit 109, are provided. However, if filtering of contents and filtering of interpretation data for identifying content data can be performed. The number of filtering units may be one, for example.

The designation from the user is “song program (P
For example, a request for a program to be filtered and contents may be requested at the same time, and a PID and a contents identifier may be specified at the same time, and filtering may be performed.

(Embodiment 2) FIG. 2 shows a configuration of a receiving apparatus 20 according to Embodiment 2 of the present invention.
The configuration is such that the content data recording unit 21 is added to the receiving device 100 according to the first embodiment. In the receiving apparatus 100 according to Embodiment 1, in order to interpret the content information identifier included in the content data, the identifier interpretation data needs to be received earlier than the content data. However, in the receiving device 20 according to the second embodiment, the provision of the content data recording unit 21 allows the content data to be received earlier than the identifier interpretation data. The once received content data is recorded in the content data recording unit 21 and thereafter held until identifier interpretation data is received.
In this case, the correspondence between the identifier interpretation data and the content data is determined by the flag value of the identifier interpretation data and the content information identifier included in the content data.
Perform with the value of flag.

When the identifier interpretation data is received and recorded in the identifier interpretation data recording unit 106, the content data is transmitted from the content data recording unit 21 to the content filtering unit 109, and filtering is performed for each content information identifier.

The present invention is realized by a program.
By recording this on a recording medium such as a floppy (registered trademark) disk and transferring it, it can be easily realized by another independent system.

[0034]

As described above, according to the present invention, the conventional PID
It is possible to grasp the contents of the content data performed in units of access units by using the content information identifier, and it is possible to perform filtering of the content data that is further subdivided.

Normally, the PID is assigned to each program, so that the conventional receiving apparatus has only a filtering function for each PID and can only perform filtering for each program. However, the receiving apparatus proposed in the present invention is In addition to filtering in PID units, it has a function to filter content data in units of content information identifiers added at the PES level.For example, you want to automatically edit by filtering only the talk corner in a song program For example, it is possible to perform reception control in accordance with the needs of the viewer.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a configuration representing a first embodiment of the present invention.

FIG. 2 is a functional block diagram showing a configuration representing a second embodiment of the present invention.

FIG. 3 is a diagram showing a multiplexing process of content data.

FIG. 4 is a configuration diagram of a TS packet including a PID.

FIG. 5 is a diagram showing an example of PID interpretation data.

FIG. 6 is a diagram showing a process of adding a content information identifier.

FIG. 7 is a configuration diagram of a PES packet including a content information identifier.

FIG. 8 is a diagram showing an example of identifier interpretation data.

FIG. 9 is a functional block diagram of a conventional receiving apparatus.

FIG. 10 is a flowchart from reception of a TS to filtering of content data.

[Explanation of symbols]

 Reference Signs List 100 receiving device 101 data receiving unit 102 identifier interpretation data requesting unit 103 PID interpretation data requesting unit 104 PID filtering unit 105 identifier interpretation data recording unit 106 PID interpretation data recording unit 107 program identification request conversion unit 108 content identification request conversion unit 109 content filtering Unit 110 Filtering result storage unit 20 Receiving device provided with content data recording unit 21 Content data recording unit 30 Information source coding unit 31 Data grouping unit 32 Transmission packetization unit 33 Packet multiplexing unit 40, 41, 42 TS packet 5 PID Interpretation data 60 ES division means 61 Header addition means 62 Identifier addition means 63 Identifier generation means 70 PES packet 71 Content information identifier 8 Identifier interpretation data 90 Conventional receiving device 91 Data receiving unit 92 PID interpretation data request section 93 PID filtering section 94 PID interpretation data recording section 95 Program identification request conversion section 96 Filtering result storage section

Claims (5)

[Claims] 1. A data receiving means for receiving data including a PID number for identifying a packet and a content information identifier for identifying the content of content data; a content identification request converting means for associating a content data acquisition command with the content information identifier; A data receiving apparatus comprising: a filtering unit configured to filter data received by the data receiving unit based on a predetermined PID number and the converted content identifier. 2. The data received by the data receiving unit further includes identifier interpretation data for retaining a correspondence relationship between information of a content data acquisition command and the content information identifier, and the content identification conversion unit includes 2. The data receiving apparatus according to claim 1, wherein a content data acquisition instruction is associated with the content information identifier based on the content data identifier. 3. The data receiving apparatus according to claim 1, further comprising a content data recording unit that records content data in PID units filtered by the filtering unit. 4. A data receiving step for receiving data including a PID number for identifying a packet and a content information identifier for identifying the content of the content data; a content identification request converting step for associating a content data acquisition command with the content information identifier; The data received in the data receiving step is a predetermined PI
A data receiving method, comprising: a filtering step of filtering based on a D number and the converted content identifier. 5. A data receiving step for receiving data including a PID number for identifying a packet and a content information identifier for identifying the content of the content data; a content identification request converting step for associating a content data acquisition command with the content information identifier; The data received in the data receiving step is a predetermined PI
A computer-readable recording medium storing a program for executing a filtering step of performing filtering based on a D number and the converted content identifier.