JPH11341493A - Digital broadcast reception terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of a synthesis result by detecting presence/ absence of a data error of object data based on scene description data and conducting error processing based thereon. SOLUTION: A synthesis section 55 synthesizes audio object data, video object data and character object data based on scene description analysis data to generate audio information, video information and character information, and generates error information based on a data error notice detected by an error detection section 56. A display section 58 and a speaker section 59 acting also as a data error display means are connected to an output terminal of the synthesis section 55. The display section 58 displays video information and character information including the error notice generated by the synthesis section 55 and the speaker section 59 outputs audio information including the error notice. The error detection processing mainly checks presence/absence of occurrence of an error in the decoding processing of the objects, presence/ absence of past/present decoding processing and a current time or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast suitable for providing a broadcast of video, audio, data, etc. to a desired service area using a geostationary satellite arranged in a geosynchronous orbit above the equator. The present invention relates to a digital broadcast receiving terminal suitable for use in a system.

[0002]

2. Description of the Related Art In recent years, in the field of broadcasting systems, satellite broadcasting systems capable of providing services over a wide area have been developed, and diversification of broadcasting services has been attempted.
In such a satellite broadcasting system, compared to conventional broadcasting systems, channel signals such as broadcast signals including video and audio can be relatively easily transmitted over a wide area without installing large-scale broadcasting facilities on the ground. It has the feature that it can be provided to a service area.

For example, as a satellite broadcasting system, BS
(Broadcasting Satellite)
Broadcasting, CS (Communication Satel)
lite) broadcasting has been put to practical use.

However, in the above satellite broadcasting system, when the number of broadcast channels is increased in any of the systems, the output requirement of a relay-side power amplifier mounted on a satellite is also increased. There is a problem that it is not suitable for mobile communication.

[0005] Therefore, recently, multimedia-encoded voice / sound / image data is transmitted in units of objects using a satellite deployed in a geosynchronous orbit, and a receiving terminal mounted on a moving body or the like transmits the data in units of objects. Satellite broadcasting systems capable of synthesizing and presenting object data have been developed.

[0006] However, in the above-mentioned satellite broadcasting system, the digital broadcast receiving terminal is mounted on a mobile body and used, so that it is possible to provide a specific function and improve usability and obtain highly reliable data. It is required to do so.

For example, specifically, when a data error including a reception error of the object data transmitted from the satellite occurs, the receiving terminal does not know which object data has failed to be received. There is a possibility that the reliability of the synthesized data is inferior.

[0008]

As described above, the satellite broadcasting system having the function of synthesizing object data has a problem in the reliability of the result of synthesizing at the receiving terminal.

[0009] The present invention has been made in view of the above circumstances, and has as its object to provide a digital broadcast receiving terminal capable of improving the reliability of the result of synthesis.

[0010]

According to the present invention, multiplexed data transmitted from a satellite is received, object data and scene description data are generated for each object from the multiplexed data, and the object data is converted to the scene data. A digital broadcast receiving terminal that combines and outputs based on description data, an error detection unit that detects the presence or absence of a data error in the object data based on the scene description data, and a data error detection unit that detects a data error. Error processing means for performing error processing based on the error.

[0011] According to the above configuration, by detecting the presence or absence of a data error in the object data and performing the error processing, quick recovery and repair can be performed in the event of a failure in receiving the object data. Highly accurate synthesis can be achieved. Therefore, the reliability of the synthesis result of the object data is improved, and it is possible to contribute to the construction of a satellite broadcasting system suitable for a mobile object, for example.

[0012]

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

FIG. 1 shows a schematic configuration of a satellite broadcast system to which a digital broadcast receiving terminal according to an embodiment of the present invention is applied.
And a geostationary satellite 30 whose attitude is controlled and deployed in a geostationary orbit above the equator based on a command signal from the satellite control station 20, for example.

The transmitting station 10 in FIG.
Although only one station is described, a plurality of stations may be provided.

The geostationary satellite 30 transmits, for example, a Ku band (ban) transmitted from the transmitting station 10 via an uplink transmission path.
d) a channel signal such as a broadcast signal is received by the receiving antenna 31;
, And frequency-converted to an S band, and transmitted from a transmission antenna 32 having a diameter of, for example, 8 m to a predetermined terrestrial service area via a downlink transmission path. In the service area, a channel signal transmitted from the geostationary satellite 30 is transmitted to a digital broadcast receiving terminal 50 shown in FIG. 2 including a mobile receiving terminal mounted on a mobile object, a mobile receiving terminal, and a fixed receiving terminal provided on a terrestrial building. To receive. The digital broadcast receiving terminal 50 is configured to be able to communicate with the server 41 and the transmitting station 10 via the mobile public network 40, for example.

That is, as shown in FIG. 3, the transmitting station 10 transmits, as a scene description language in object units from a program provider, audio data AU1, video data MP1, text data TX1,. Data is input to the authoring device 11.
Then, the authoring apparatus 11 inputs and performs signal processing for each object, and converts each object data into an audio object encoding unit 121, a video object encoding unit 122, a character object encoding unit 123, and a scene description encoding unit 124. Output to

The audio object encoding unit 121, the video object encoding unit 122, the character object encoding unit 123, and the scene description encoding unit 124 receive the input audio data AU1,..., Video data MP1,. The scene description data is coded according to a predetermined algorithm and output to the multiplexing unit 13.

The multiplexing unit 13 multiplexes the input audio object data, video object data, character object data, and scene description data, and transmits the multiplexed data.
Output to The transmission unit 14 transmits the input multiplexed data to the geostationary satellite 30 via the antenna 15 as described above, and transmits the multiplexed data from the geostationary satellite 30 to a predetermined service area.

The multiplexed data transmitted from the geostationary satellite 30 is received by the receiving section 51 via the antenna 511 of the digital broadcast receiving terminal 50 as shown in FIG. The demultiplexing unit 52 demultiplexes the input multiplexed data to generate audio object data, video object data, character object data, and scene description data, and generates an audio object decoding unit 531 and a video object decoding unit 532. , Character object decoding unit 533, scene description decoding unit 534
Output to Among them, the audio object decoding unit 53
1. The video object decoding unit 532 and the character object decoding unit 533 decode the input data according to a predetermined algorithm to generate audio object data, video object data, and character object data, and And outputs the result to the synthesizing unit 55.

Also, the audio object decoding unit 531
One input terminal of the error detection unit 56 is connected to the output terminals of the video object decoding unit 532 and the character object decoding unit 533. The other input terminal of the error detection unit 56 is connected to the output terminal of the scene description analysis unit 57.

The output terminal of the scene description decoding unit 534 is connected to the input terminal of the scene description analyzing unit 57,
The scene description data decoded by the scene description decoding unit 534 is input. Here, the scene description analysis unit 57 analyzes the input scene description data to generate scene description analysis data, and transmits the scene description analysis data to the error detection unit 56, the selection unit 54, and the communication control unit 60. Respectively.

The selection unit 54 selects audio object data, video object data, and character object data based on the input scene description analysis data and outputs the selected data to the synthesizing unit 55. The combining unit 55 combines the sound object data, the video object data, and the character object data based on the scene description analysis data to generate sound information, video information, and character information,
The error detection unit 56 generates error information based on an error notification of data detected as described later.

An output terminal of the synthesizing section 55 is connected to a display section 58 and a speaker section 59 which also serve as data error presenting means. The display unit 58 displays video information and character information including the error notification generated by the combining unit 55. On the other hand, the speaker unit 59 outputs acoustic information including the error notification generated by the combining unit 55.

Here, the error processing of the object data based on the error detection information included in the scene description analysis data will be described.

The object data (sound object data, video object data, character object data) and scene description analysis data are input to the error detection unit 56 as described above. this house,
From the object data, information indicating whether an error has occurred in the decoding process and information indicating whether the decoding process has been performed in the past or currently performed are set. Further, in the scene description analysis data, for example, as shown in FIG. 4, each information of audio object data, video object data, and character object data is managed as time information.

That is, when the object data and the scene description data are input, the error detection unit 56
The processing operation is started in step S1 as shown in FIG. In step S2, based on the scene description analysis data, it is determined whether or not the current time is before the start time of the scene. If the determination is yes, the process returns to step S1. If the current time is not earlier than the scene start time,
No is determined, and the process proceeds to step S3.

In step S3, it is further determined whether or not the current time has passed the end time of the scene. If the current time has passed, the determination is YES, and the error detection operation processing is terminated.
10.

If it has not passed, it means that the scene is being executed, and the process proceeds to step S4.

In step S4, one of the objects used in the scene is sequentially set from the scene description analysis data. For example, in the case shown in FIG.
Each time 4 is called, an audio object, a video object, and a character object are set in order. After the last object, the first object is set, and so on. For example, in the case shown in FIG.
A sound object is set next to the character object.

In step S5, it is checked whether or not the current time has passed the end time of the object set in step S4.
Move to step S6. If it is determined that the time has passed, the process returns to step S1.

In step S6, it is determined whether or not an error has occurred in the object decoding process. If it is determined that there is no error, the process proceeds to step S7.

In step S7, it is checked whether or not the current time has passed the start time of the object. If it is determined that the time has passed, the process proceeds to step S8. If it is determined that the time has not passed, the process returns to step S1.

In step S8, it is determined whether the object has been decrypted in the past or is currently being decrypted. If it is determined that the decryption has been performed or has been performed, the process returns to step S1, and the same error detection processing is performed. To continue.

When it is determined in step S6 that an error has occurred in the object decryption processing, or when it is determined in step S8 that no object decryption processing has been performed in the past and present, Then, the process shifts to step S9 to execute post-error detection processing. Thereafter, the process proceeds to step S2 to repeat the same error detection process.

Next, the operation of the post-error detection processing will be described.

That is, when the error detecting information is input from the error detecting unit 56, the synthesizing unit 55 first starts the post-object data error detecting process as shown in FIG.
If it is determined in step S12 that there is no error notification based on the error notification information in the scene description, the error notification operation ends.

In step S12, if there is an error notification, the process proceeds to step S13. For example, in the example of FIG. 4, the error notification of the scene description indicates “Yes”, and thus the process proceeds to step S13. Step S
In S13, it is determined whether or not the error is sound object data. If YES is determined as sound object data, the process proceeds to step S14. Step S
In 14, when it is determined that there is no error notification of the sound object data, the process proceeds to step S16, and when it is determined that the error is not, the process proceeds to step S15 to execute an error notification process. In step S16, it is determined whether data has been corrected.

In step S16, if there is no data correction, the correction operation ends. Then, in step S16, when it is determined that data has been corrected, data acquisition processing is executed. Then, the communication control unit 60 accesses the server 41 via the mobile public network 40, acquires correction data corresponding to the error part based on the scene description data, and outputs the correction data to the synthesizing unit 55. Here, the synthesizing unit 55 outputs the data updated based on the correction data to the display unit 58 and the speaker unit 59. At this time, if there is a data delay in the updated data, the synthesizing unit 55 corrects the data delay by performing a data delay process based on the scene description data.

If it is determined in step S13 that the error is not audio object data, the flow shifts to step S18 to determine whether or not the error is video object data. In this step S18, when it is determined that the video object data is yes, an error notification and a data correction operation are executed in the same procedure as in the case of the audio object data.

If it is determined in step S18 that the error is not video object data, the flow shifts to step S19 to determine whether or not the error is character object data. In step S19, if the determination is yes, which is the character object data, the error notification and the data correction operation are executed in the same procedure as in the case of the sound object data, or the post-error detection processing is performed in the state where the no is determined. Complete.

As the error notification method, the display unit 58 or the speaker unit 59 selectively presents the error in units of objects. For example, the sound object data is presented by the speaker unit 59, and the video object data and the character object data are presented by the display unit 58. The presentation of the error notification is automatically canceled when the scene changes, for example. This allows
The subsequent functions of the display unit 58 and the speaker unit 59 are not affected.

The error notification (presentation) method is selectively changed, for example, via the transmitting station 10. Further, the change of the error notification method is configured, for example, to be directly performed by the user on the terminal side, or configured to be performed by the transmitting station 10.

As described above, the digital broadcast receiving terminal 5
No. 0 is provided with an error detection unit 56 to detect the presence or absence of a data error of the received object data in units of objects based on the scene description data and perform error processing.

According to this, since a data error of the received object data is detected and the error processing is performed, quick recovery and repair can be performed when the reception of the object data fails. As a result, the reliability of the synthesis result of the object data is improved, and it is possible to realize, for example, the construction of a satellite broadcasting system suitable for a mobile object.

In the above-described embodiment, a case has been described in which the data in which an error has occurred is acquired using the server 41. However, the present invention is not limited to this. The configuration may be such that the station 10 is accessed to obtain desired data.

In the above embodiment, the case where the present invention is applied to a satellite broadcasting system has been described. However, the present invention is not limited to this, and can be applied to a terrestrial digital broadcasting system.

Therefore, it is needless to say that the present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention.

[0048]

As described above, according to the present invention, it is possible to provide a digital broadcast receiving terminal capable of improving the reliability of a synthesized result.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a satellite broadcasting system to which a digital broadcast receiving terminal according to an embodiment of the present invention is applied.

FIG. 2 is a block diagram showing a configuration of a digital broadcast receiving terminal according to one embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a transmitting station in FIG.

FIG. 4 is a diagram illustrating an example in which information of object data is managed as time information in scene description data.

FIG. 5 is a flowchart showing a processing procedure for error detection by an error detection unit in FIG. 2;

FIG. 6 is a flowchart illustrating a processing procedure for error notification of the combining unit in FIG. 2;

[Explanation of symbols]

 10 ... transmitting station. 11 Authoring device. 121 ... audio object encoding unit. 122: Video object encoding unit. 123: Character object encoding unit. 124 scene description encoding unit. 13 multiplexing unit. 14 ... transmission unit. 15 ... Antenna. 20 ... satellite control station. 30 ... geostationary satellite. 31 ... receiving antenna. 32 ... transmitting antenna. 40: Mobile public network. 41 ... Server. 50 Digital broadcast receiving terminal. 51 ... receiving unit. 511 ... an antenna. 52 ... demultiplexing unit. 531 ... sound object decoding unit. 532... Video object decoding unit. 533: Character object decoding unit. 534... Scene description decoding unit. 54 ... Selection unit. 55 ... Synthetic unit. 56: Error detection unit. 57 ... scene description analysis unit. 58 ... display unit. 59 ... speaker unit. 60 Communication control unit.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04N 7/081 H04N 7/08 Z 7/20 G06F 15/62 340Z // G06T 13/00 (72) Inventor Tsutomu Owawa Kanagawa 70 Yanagicho, Saiwai-ku, Kawasaki

Claims (8)

[Claims] 1. Receiving the transmitted multiplexed data, generating object data and scene description data for each object from the multiplexed data, and combining and outputting the object data based on the scene description data. An error detecting means for detecting presence or absence of a data error of the object data based on the scene description data, and an error processing means for performing error processing based on data error detection of the error detecting means. A digital broadcast receiving terminal, comprising: 2. The digital broadcast receiving terminal according to claim 1, wherein the scene description data includes error processing information. 3. The data processing apparatus according to claim 1, wherein the error processing unit obtains object data based on the scene description data and corrects the data in response to data error detection by the error detection unit. Digital broadcast receiving terminal. 4. The digital broadcast receiving apparatus according to claim 1, further comprising an error presenting means for presenting a data error occurrence in response to the data error detection of said error detecting means. Terminal. 5. The digital broadcast receiving terminal according to claim 4, wherein said error presenting means presents a recovery in a data corrected state after presenting a data error occurrence. 6. The digital broadcast receiving terminal according to claim 4, wherein said error presenting means cancels the presentation in conjunction with a scene change after presenting a data error occurrence. 7. The digital broadcast receiving terminal according to claim 4, wherein said error presenting means changes a presenting method based on object data. 8. The digital broadcast receiving terminal according to claim 4, wherein said error presenting means sets a presenting method based on instruction information transmitted from an external transmitting means.