JP3857120B2 - Data broadcasting receiver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a broadcast receiving apparatus for receiving a data broadcast.
[0002]
[Prior art]
Data broadcasting is being implemented and studied in various broadcasting such as satellite digital broadcasting and terrestrial digital broadcasting. In such data broadcasting, it is being implemented and studied to include not only character data but also various data. For example, DAB (Digital Audio Broadcasting) broadcasting, which is high-quality audio digital broadcasting, includes data services in addition to audio services such as music and audio programs. In a data service channel in DAB, multimedia data such as characters and image information is provided as a MOT (Multimedia Object Transfer) object in a predetermined format.
[0003]
The multimedia data provided as the MOT object includes a lot of data that can be handled on a personal computer in the standard, and the following are the main ones.
・ Text data (HTML, Text (US-ASCII), etc.)
・ Still image data (GIF, JPEG, BMP, etc.)
・ Audio data (MPEG1 audio Layer 3, AIFF, etc.)
・ Video data (MPEG4 video, etc.)
[0004]
[Problems to be solved by the invention]
By adding a function for receiving and decoding the MOT object to the DAB receiving device, the acquired MOT object can be played back by a dedicated application for displaying data service information incorporated in the receiving device. . However, since the types and sizes of the MOT objects are various, when receiving multimedia data such as an MOT object in the receiving apparatus, it is necessary to consider to use memory resources inside the receiving apparatus efficiently. For example, if the receiving apparatus is configured to decode all received MOT objects and store them in the memory in the receiving apparatus, the memory in the receiving apparatus may be compressed.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a data broadcast receiving apparatus that can efficiently use memory resources in receiving data broadcasts.
[0006]
[Means for Solving the Problems]
To achieve the above object, the broadcast receiving apparatus according to claim 1, wherein the data of the data type of the data provided as data service, and the previously stored memory means information related to a predetermined data type, the received Decoding means for decoding only service data corresponding to the predetermined data type stored in the storage means, and output means for outputting based on the data of the data service in the decoded state . In this broadcast receiving apparatus, the information related to the predetermined data type stored in the storage means is information related to the data type supported by the output means.
[0007]
In the broadcast receiving apparatus, only data of a predetermined data type is decoded among the data of the received data service, so that unnecessary data is prevented from being decoded and memory resources of the broadcast receiving apparatus are wasted. Consumption can be avoided. The output means of the broadcast receiving apparatus, for example, can be configured in the broadcast receiving apparatus, as an application program for performing a display or the like reads the data of the decoded data services.
[0008]
The broadcast receiving apparatus according to claim 2 further includes a selection means for receiving data service data of a channel selected in advance. In this case, the data service data used by the decoding means is data of the data service of the channel selected by the selection means.
[0009]
In order to achieve the above object, the broadcast receiving apparatus according to claim 3 is a broadcast receiving apparatus for receiving a broadcast including a data service, and a first storage means for storing the received data of the data service; A second storage unit that stores a code indicating a data type included in the header of the data service data, and an output unit that outputs the decoded data based on the data of the data service. This output means can be configured as, for example, an application program for reading and displaying decoded data service data in a broadcast receiving apparatus. Further, the broadcast receiving apparatus extracts, from the data types of data provided as a data service, an extraction unit that extracts a data type supported by the output unit, and a third memory that stores the data type extracted by the extraction unit. Data service information should be decoded based on the comparison results of the means, the data type stored in the second storage means, the data type stored in the third storage means, and the comparison result by the comparison means A determination means for determining whether or not, a decoding means for reading out and decoding data of the data service stored in the first storage means based on a determination result by the determination means, and a fourth for storing the decoding result by the decoding means Storage means. Only data corresponding to the output means is decoded and stored. Therefore, wasteful consumption of memory resources in the broadcast receiving apparatus can be avoided. The output means may use decoded data stored in the fourth storage means.
[0010]
In order to achieve the above object, the broadcast receiving apparatus according to claim 4 is a broadcast receiving apparatus that receives a broadcast including a data service, the first storage means for storing data of the received data service, and the received data service. Second storage means for storing a code indicating a data type included in the header of data of the data service, and communication means for performing communication with an external device are provided. Further, the broadcast receiving device extracts from the external device a data type supported by the external device among the data types of the data provided as a data service, and extracts the data type by the extracting device. Based on the comparison result by the third storage means for storing the data type stored, the data type stored in the second storage means, the comparison means for comparing the data types stored in the third storage means, and the comparison means. A determination means for determining whether or not to decode data of the data service; a decoding means for reading out and decoding the data service data stored in the first storage means based on a determination result by the determination means; And fourth storage means for storing the decoding result by the means. Only data supported by the external device is decoded and stored. Therefore, wasteful consumption of memory resources in the broadcast receiving apparatus can be avoided. The external device may acquire and use the decoded data stored in the fourth storage means via the communication means.
[0011]
The broadcast receiving apparatus according to claim 5 further includes a selection means for receiving data of data service of a channel selected in advance. In this case, the data service data stored in the first storage means is the data service data of the channel selected by the selection means, and the data service data used in the second storage means is selected by the selection means. The data of the data service of the selected channel.
[0012]
Data type, text data, image data, it is preferable that representing at least data format for one to one of the audio data (claim 6).
[0013]
In the broadcast receiving apparatus according to claim 7 , the received broadcast is a DAB broadcast, and the data provided as a data service is a MOT object.
[0014]
In the broadcast receiving device according to claim 8 , the output in the output means includes an output by display.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows the configuration of a system including a DAB receiver 1 as an embodiment of the present invention. In FIG. 1, a navigation device 13 is connected to the DAB receiving device 1, and an application program executed on the navigation device 13 receives a MOT object decoded on the DAB receiving device 1 side and receives the data on the navigation device 13. Display on a display unit (not shown). It is assumed that the application program of the navigation device 13 corresponds to the display of data in JPEG format, for example.
[0016]
The MOT object is data in a format used for providing multimedia data in the DAB data service, and is composed of a header portion representing the contents of the MOT object and a data body. The header portion at the head includes Content Type (6 bits) and Content Subject Type (9 bits) as information for identifying the contents of the data body. For example, JPEG data is defined by Content Type = 000010 and Content Subject Type = 000000001.
[0017]
An operation until the MOT object is decoded in the DAB receiving apparatus 1 will be described.
The DAB broadcast wave received by the antenna 2 is amplified by a high-frequency signal by the RF unit 3 and converted to an intermediate frequency signal (IF signal), and then quadrature demodulated by the quadrature demodulation unit 4, and an A / D converter 5 is digitized and sent to the FFT processing unit 6. In the FFT processing unit 6, OFDM demodulation processing is performed, and the OFDM demodulated received data is sent to the DAB decoder 7. The DAB decoder 7 has a function of separating audio data and data service data from the received data input from the FFT processing unit 6. The audio data extracted in accordance with an instruction from the DAB microcomputer 10 is sent to the MPEG decoding unit 8. Send it out. In the MPEG decoding unit 8, MPEG decoding processing is performed, and the decoded audio data is then reproduced as music or voice via the D / A converter 9.
[0018]
In parallel with the reproduction of the audio data as described above, the DAB microcomputer 10 sends the data service data extracted by the DAB decoder 7 to the DAB decoder 7 (hereinafter referred to as data service information). Send a command (command C1). Here, the data service information transmitted by the DAB decoder 7 is data service information of the channel of the data service designated by the user via the operation unit (not shown) connected to the DAB microcomputer 10. In response to the command C1, the DAB decoder 7 sends the data service information of the designated channel to the DAB microcomputer 10, and the DAB microcomputer 10 temporarily stores the received data service information in its internal memory 10a. To do. At the same time, the DAB microcomputer 10 also sends data service information to the data decoder microcomputer 11.
[0019]
The data decoder microcomputer 11 stores the data service information received from the DAB microcomputer 10 in its internal memory 11a. At this point, the data service information has not been decoded yet. The data decoder microcomputer 11 refers to the header information of the data service information, and uses the data indicating the number of data of the same type included in the header information for the storage process of the data service information in the internal memory 11a. be able to.
[0020]
As will be described below, among the data before decoding stored in the internal memory 11a of the data decoder microcomputer 11, only the MOT object corresponding to the application program on the navigation device 13 side is decoded and stored in the internal memory 11a. Stored in The application program executed by the system microcomputer 12 on the navigation device 13 side receives only the MOT object corresponding to itself from the data decoder microcomputer 11 and reproduces it.
[0021]
Next, operations related to reception of data services in the system of FIG. 1 will be described with reference to the flowcharts of FIGS. The operation shown in FIG. 2 corresponds to pre-processing in which the data decoder microcomputer 11 acquires the data type of the MOT object to be decoded. The operation shown in FIG. 3 corresponds to the decoding process of the MOT object in the data decoder microcomputer 11. The processing of FIG. 3 may be configured to start when data service information is stored in the internal memory 11a of the data decoder microcomputer 11, for example. 2 and 3 are executed under the control of the data decoder microcomputer 11.
[0022]
The data type acquisition process in FIG. 2 will be described.
When the data decoder microcomputer 11 detects that the navigation device 13 is connected to the DAB receiver 1 for the first time by monitoring the connection line 31 with the system microcomputer 12, the data decoder microcomputer 11 A command (command C2) requesting transmission of the data type supported by the application program is sent (S1). On the other hand, the system microcomputer 12 returns the data type (Content Type, Content Subtype) supported by the application program (S2). The data decoder microcomputer 11 stores the data type (Content Type, Content Subtype) received from the system microcomputer 12 in its own internal memory 11a (S3). In the case where there are a plurality of data types of MOT objects supported by the application program on the navigation device 13 side, the data decoder microcomputer 11 receives a plurality of data types (Content Type, Content Subtype).
[0023]
As a storage method in the internal memory 11a in step S3, a flag is associated with each data type, the flag of the data type supported by the application program is set to “1”, and the flag of the data type not supported is set. Set to “0”.
[0024]
Next, the main process will be described with reference to FIG.
First, the data decoder microcomputer 11 reads the header information from the data service information stored in the internal memory 11a (S11), and determines whether the MOT object is included in the data service information (S12). If the MOT object is included (S12: YES), the header part in the MOT object is examined, and the content type of the MOT object and the content corresponding to the navigation device 13 side application program stored in the internal memory 11a are supported. The Type is compared (S13). If any of the data types supported by the application matches the Content Type of the MOT object (S14: YES), they are further compared with the Content Subtype of the MOT object. (S15).
[0025]
If the Content Subtype also matches, that is, if there is a data type that the application supports that completely matches the type of the MOT object (S15: YES), the data decoder microcomputer 11 stores it in the internal memory 11a. The previously read data service information is read and decoded (S16), and the decoded data is stored in a predetermined area of the internal memory 11a (S17). Thus, the data decoder microcomputer 11 decodes only necessary MOT objects and stores them in the internal memory 11a.
[0026]
Thereafter, when there is a transmission request for data service information from the system microcomputer 12, the data decoder microcomputer 11 transmits the decoded and stored data. Therefore, the system microcomputer 12 does not receive an MOT object that is not supported by the application on the navigation device 13 side. If the received data does not include the MOT object (S12: NO), the data type of the MOT object and the data type corresponding to the application program do not match (S14: NO, S15: NO), the data The process ends without decoding the service information.
[0027]
The process of FIG. 3 described above is an example in which the MOT object is compared with the data type that the application supports only once, but the series of processes of steps S13 to S17 is performed as header information of the data service information. The number of times based on the data representing the number of data (that is, the number of MOT objects) may be repeated.
[0028]
In the above description, the data decoder microcomputer 11 has been described as storing the data type corresponding to the application on the navigation device 13 side in its internal memory 11a. However, the data service display unit is displayed on the DAB receiving device 1 side. 14 is incorporated, the data type corresponding to the application on the DAB receiving apparatus 1 side may be stored in the memory 11a and applied to the main processing in FIG.
[0029]
The data type acquisition process shown in FIG. 2 is performed even when the application on the navigation device 13 side is changed (for example, when another model is connected to the DAB receiver 1 or an application is installed). It is preferable that the configuration is activated. In this case, an MOT object that can be handled by the latest application can be acquired.
[0030]
【The invention's effect】
As described above, according to the present invention, only the data service information supported by the application is decoded and no unnecessary decoding processing is performed. Therefore, memory resources in the broadcast receiving apparatus are saved, and decoding processing is performed at high speed. Can be achieved.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a system including a broadcast receiving apparatus as an embodiment of the present invention.
FIG. 2 is a flowchart showing a data type acquisition process in the broadcast receiving apparatus of FIG.
FIG. 3 is a flowchart showing a decoding process of data service information in the broadcast receiving apparatus of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 DAB receiver 2 Antenna 3 RF part 4 Orthogonal demodulator 5 A / D converter 6 FFT processing part 7 DAB decoder 8 MPEG decoding part 10 DAB microcomputer 11 Data decoder microcomputer 12 System microcomputer 13 Navigation apparatus

Claims (8)

A broadcast receiving device for receiving a broadcast including a data service,
Among the data types of the data provided as the data service, and the previously stored memory means information related to a predetermined data type,
Decoding means for decoding only data corresponding to the predetermined data type stored in the storage means among the data of the received data service;
Output means for performing output based on the data of the data service in a decoded state; and
The broadcast receiving apparatus characterized in that the information on the predetermined data type stored in the storage means is information on a data type supported by the output means . And further comprising selection means for receiving data of the data service of the preselected channel,
2. The broadcast receiving apparatus according to claim 1, wherein the data service data used by the decoding means is data service data of a channel selected by the selection means. A broadcast receiving device for receiving a broadcast including a data service,
First storage means for storing data of the received data service;
Second storage means for storing a code indicating a data type included in a header of data of the received data service;
Output means for outputting based on the data of the data service in a decoded state;
Extracting means for extracting a data type supported by the output means from among data types of data provided as the data service;
Third storage means for storing the data type extracted by the extraction means;
Comparing means for comparing the data type stored in the second storage means with the data type stored in the third storage means;
Determining means for determining whether or not to decode the data of the data service based on a comparison result by the comparing means;
Decoding means for reading and decoding data of the data service stored in the first storage means based on a determination result by the determination means;
And a fourth storage means for storing a result of decoding by the decoding means. A broadcast receiving device for receiving a broadcast including a data service,
First storage means for storing data of the received data service;
Second storage means for storing a code indicating a data type included in a header of data of the received data service;
A communication means for communicating with an external device;
Extraction means for extracting from the external device, via the communication means, a data type supported by the external device among data types of data provided as the data service;
Third storage means for storing the data type extracted by the extraction means;
Comparing means for comparing the data type stored in the second storage means with the data type stored in the third storage means;
Determining means for determining whether or not to decode the data of the data service based on a comparison result by the comparing means;
Decoding means for reading and decoding the data service information stored in the first storage means based on the determination result by the determination means;
And a fourth storage means for storing a result of decoding by the decoding means. A selection means for receiving data service data of a preselected channel;
The data service data stored in the first storage means is data service data of a channel selected by the selection means,
Wherein the data of the data service used in the second storage unit, the broadcast receiving apparatus according to claim 3 or claim 4, characterized in, that the data of the data service channel selected by said selection means. Wherein the data type is a broadcast receiving apparatus according to any one of text data, image data, represent the least data format for one to one of the audio data, from claim 1, wherein according to claim 5. The broadcast is a DAB (Digital Audio Broadcasting) broadcasting, data provided as the data service, MOT (Multimedia Object Transfer) that is an object, to any one of claims 1 to 6, wherein The broadcast receiving apparatus described. 4. The broadcast receiving apparatus according to claim 3 , wherein the output in the output means includes an output by display.

Images