CN100364321C - Caption data receiving device for digital television system and its method - Google Patents
Caption data receiving device for digital television system and its method Download PDFInfo
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- CN100364321C CN100364321C CNB200410058456XA CN200410058456A CN100364321C CN 100364321 C CN100364321 C CN 100364321C CN B200410058456X A CNB200410058456X A CN B200410058456XA CN 200410058456 A CN200410058456 A CN 200410058456A CN 100364321 C CN100364321 C CN 100364321C
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Abstract
The present invention provides a caption data receiving device for digital television systems and a method. Caption data is directly obtained from a TP data packet and is not obtained after a whole PES data packet is received. Therefore, the processing speed of the caption data can be largely quickened and the expense of systems of a memory, a processor, etc. can be correspondingly reduced. The caption data receiving method of the present invention is used for receiving the caption data which is transmitted by a data transmitting packet in a digital television system, and is characterized in that the caption data receiving method comprises the following steps that the data transmitting packet is received; the data transmitting packet is judged whether or not comprises the caption data; if the data transmitting packet comprises the caption data, the caption data is obtained from the data transmitting packet and is displayed on a display; if the data transmitting packet does not comprise the caption data, the data transmitting packet is discarded.
Description
Technical field
The present invention relates to the receiving system and the method for the caption data in the digital television system, relate in particular to receiving system and method thereof with the caption data of transmits data packets (Transport Packet, hereafter is the TP packet) transmission.
Background technology
Past, in digital television system, conventional caption data method of reseptance is to receive a plurality of TP packets, and a synthetic complete PES (Packetized Elementary Stream: Packet Elementary Stream) packet, obtain caption data again and show from this PES packet.
Fig. 1 is the flow chart of the caption data method of reseptance of the routine in the explanation digital television system.
Specifically, as shown in Figure 1, the receiving course of conventional caption data is as follows: at first, in step S1, receive the TP packet; At step S2, judge in the TP packet that is received, whether to comprise the PES data head; Comprise the PES data head in the TP packet if judge, then enter step S3,, and reset current PE S packet old PES data packet discarding; Do not comprise the PES data head in the TP packet if judge, then directly enter step S4, from the TP packet, parse the PES packet; In step S5, judge whether current PE S packet receives, if receive the current PE S packet that is over, then enter step S6, otherwise return step S1, receive next TP packet; Then, in step S6, judge whether the PES packet is complete,, then enter step S7, from the TP packet that is received, obtain caption data, and in step S8, show this caption data if complete; If it is imperfect to judge packet in step S6, then in step S9, abandon current PE S packet, return S1 then, receive next TP packet.
But in the above-mentioned captions method of reseptance, PES length of data package maximum is the 64K byte, and the regular length of TP packet is 184 bytes.Be assigned to a plurality of TP packets when transmitting at the PES packet,, just might can not receive each TP and wrap, thereby cause the imperfect of PES packet, and be forced to abandon if when equipment is subjected to the interference of various factors.Therefore, if after receiving a complete PES packet, from this PES packet, obtain caption data again and show, then will cause memory cost to strengthen problems such as display delayed.So that the user when using captions, may feel the inconsistent of the vision and the sense of hearing.
Summary of the invention
The present invention In view of the foregoing proposes, the caption data receiving system and the method thereof that the purpose of this invention is to provide a kind of digital television system, it directly obtains caption data from the TP packet, rather than after receiving whole PES packet, just obtain caption data, accelerating processing caption data speed greatly, and correspondingly reduce the overhead of memory, processor etc.
To achieve these goals, caption data receiving system of the present invention is used in digital television system, reception is characterized in that with the caption data of transmits data packets transmission, comprising: receiving element, be used to receive transmits data packets, and this transmits data packets is exported to the processing caption data unit; Display unit is used to show the caption data of being exported by described processing caption data unit; And the processing caption data unit, its described transmits data packets to described receiving element output is handled, and comprising: judging unit is used for judging whether described transmits data packets comprises caption data; The caption data acquiring unit, it obtains caption data according to the judged result of judging unit from described transmits data packets, and this caption data is exported to described display unit.
In the above-mentioned caption data receiving system, can also comprise caption data completeness check unit, this caption data completeness check unit carries out verification to the integrality of the caption data that the caption data acquiring unit is exported, and the caption data that will pass through completeness check is exported to described display unit; Described display unit shows the output of described caption data completeness check unit.
In the above-mentioned caption data receiving system, described caption data completeness check unit can carry out the integrality that verification comes the verification caption data by the length to caption data.
The present invention also provides a kind of caption data method of reseptance, is used in digital television system, receives the caption data with the transmits data packets transmission, it is characterized in that, may further comprise the steps: receive transmits data packets; Judge and whether comprise caption data in this transmits data packets; If comprise caption data in this transmits data packets, then from this transmits data packets, obtain caption data, and this caption data is presented on the display; If do not comprise caption data in this transmits data packets, then abandon this transmits data packets.
Above-mentioned caption data method of reseptance obtain caption data from described transmits data packets after, can also comprise the caption data completeness check step of the integrality of caption data being carried out verification.
Above-mentioned caption data method of reseptance in described caption data completeness check step, can carry out the integrality that verification comes the verification caption data by the length to caption data.
According to captions receiving system of the present invention and method, because not as prior art, after carrying out verification at synthetic PES packet and to its integrality, just obtain caption data, but directly from the TP packet, obtain caption data, therefore, can accelerate the inbound pacing of caption data, and reduce the expense of system resource.
In addition, before showing caption data,, can improve the correctness of caption data by caption data being carried out completeness check such as length check.
Description of drawings
Fig. 1 is the flow chart of the caption data method of reseptance of the routine in the explanation digital television system.
Fig. 2 is the block diagram of caption data receiving system of the present invention.
Fig. 3 is the flow chart of explanation captions method of reseptance of the present invention.
Embodiment
Below, referring to Fig. 2 and Fig. 3, embodiments of the present invention are described.
Because the regular length of caption data bag is 46 bytes, a TP packet can comprise 3 caption data bags at most, and because the situation that a caption data is included in transmission in two TP bags can not appear in the use of byte of padding.Therefore, the present invention considers directly to obtain the caption data bag from the TP packet, and omits the synthetic and verification to the PES packet, thus speed up processing, the expense of small system resources.
Fig. 2 is the block diagram of caption data receiving system of the present invention.
As shown in Figure 2, captions receiving system of the present invention is made of the receiving element 1, processing caption data unit 2 and the display unit 3 that receive the TP packet.Receiving element 1 is the receiver of reception digital informations such as demodulator, antenna etc., and its receives the TP packet that sends by digital television broadcasting system, and this TP packet is exported to processing caption data unit 2.Processing caption data unit 2 is unit that microcomputer or single-chip microcomputer etc. are handled caption data, and it is exported to display unit 3 to the caption data after handling and shows.Display unit 3 is display devices such as cathode ray tube that the caption data of being imported is shown, LCDs, plasma panel.
Wherein, processing caption data unit 2 comprises: judge the judging unit 21 that whether comprises caption data in the TP packet that is received; From the TP packet that is received, obtain the caption data acquiring unit 22 of caption data; The integrality of the caption data that caption data acquiring unit 22 obtained is carried out the completeness check unit 23 of school inspection etc.
Below, referring to the flow chart of Fig. 3, the flow process of the captions method of reseptance of captions receiving system of the present invention is described.
At first, receiving element 1 receives the TP packet (step S1) that sends by digital television system, and this TP packet is exported to processing caption data unit 2.The judging unit 21 of processing caption data unit 2 is according to the header data information of the TP packet of being imported, specifically, according to whether comprising the PES packet that captions show usefulness in this TP packet, judge whether comprise caption data (step S2) in this TP packet.If the result that step 2 is judged comprises caption data in this TP packet, then this TP packet is exported to caption information acquiring unit 22.Caption information acquiring unit 22 is extracted caption data out from this TP packet, and the caption data of being extracted out is exported to completeness check unit 23 (step S3).Then, the integrality of the 23 pairs of caption datas of being imported in completeness check unit is carried out completeness checks such as length check, and the caption data that will have an integrality is exported to display unit 3 (step S4); At last, 3 pairs of caption datas of being imported of display unit show (step S5).
On the other hand,, then abandon this TP packet (step S6), return step S1, receive new TP packet if the result that step 2 is judged does not comprise caption data in this TP packet.
Provided an embodiment of the invention above, still, the present invention is not limited to this execution mode.For example, those skilled in the art will appreciate that above-mentioned judging unit 21, caption information acquiring unit 22, completeness check unit 23 both can realize with hardware, also can realize, can also realize with combination thereof with software.
In addition, in the above-described embodiment, ID (data_identifier) and the length of the verification caption data integrality that wait come verification caption data thereof of completeness check unit 23 by checking the caption data bag.But also can come the integrality of verification caption data by other method.
In addition, in the above-described embodiment, the integrality with integrality verification unit 23 is come the verification caption data still, is not limited to this.Because caption data is sent out twice, error probability is very low, therefore, also can omit checking procedure, and directly show caption information, like this, can further improve the display speed of caption data.
According to captions method of reseptance of the present invention, owing to directly from the TP packet, obtain caption data, rather than after receiving whole PES packet, just obtain caption data, therefore, accelerate processing caption data speed greatly, and correspondingly reduced the expense of system resources such as memory, processor.
Claims (4)
1. a caption data receiving system is used in digital television system, receives the caption data with the transmits data packets transmission, it is characterized in that, comprising:
Receiving element is used to receive transmits data packets, and this transmits data packets is exported to the processing caption data unit;
Display unit is used to show caption data; And
The processing caption data unit, its described transmits data packets to described receiving element output is handled, and comprises:
Judging unit is used for judging whether described transmits data packets comprises caption data;
The caption data acquiring unit, it obtains caption data according to the judged result of judging unit from described transmits data packets;
Caption data completeness check unit, this caption data completeness check unit carries out verification to the integrality of the caption data that the caption data acquiring unit is exported, and the caption data that will pass through completeness check is exported to described display unit; Described display unit shows the output of described caption data completeness check unit.
2. caption data receiving system as claimed in claim 1 is characterized in that,
Described caption data completeness check unit carries out the integrality that verification comes the verification caption data by the length to caption data.
3. a caption data method of reseptance is used in digital television system, receives the caption data with the transmits data packets transmission, it is characterized in that, may further comprise the steps:
Receive transmits data packets;
Judge and whether comprise caption data in this transmits data packets;
If comprise caption data in this transmits data packets, then from this transmits data packets, obtain caption data and carry out the integrality of caption data completeness check step with the verification caption data, the caption data that will have integrality is presented on the display; If do not comprise caption data in this transmits data packets, then abandon this transmits data packets.
4. caption data method of reseptance as claimed in claim 3 is characterized in that,
In described caption data completeness check step, carry out the integrality that verification comes the verification caption data by length to caption data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410058456XA CN100364321C (en) | 2004-08-16 | 2004-08-16 | Caption data receiving device for digital television system and its method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410058456XA CN100364321C (en) | 2004-08-16 | 2004-08-16 | Caption data receiving device for digital television system and its method |
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| CN1738385A CN1738385A (en) | 2006-02-22 |
| CN100364321C true CN100364321C (en) | 2008-01-23 |
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| CNB200410058456XA Expired - Fee Related CN100364321C (en) | 2004-08-16 | 2004-08-16 | Caption data receiving device for digital television system and its method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102739991B (en) * | 2011-05-09 | 2017-04-12 | 新奥特（北京）视频技术有限公司 | Character generator information checking method and system in protocol communication manner |
| CN112423088A (en) * | 2020-11-18 | 2021-02-26 | 安徽宝信信息科技有限公司 | Intelligent screen data transmission method and system based on online subtitles |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0730814A (en) * | 1993-07-09 | 1995-01-31 | Nec Corp | Title super transmission system |
| CN1062103C (en) * | 1992-10-12 | 2001-02-14 | 株式会社金星社 | Apparatus and method for controlling caption display |
| JP2003018128A (en) * | 2001-07-04 | 2003-01-17 | Sony Corp | Data processor |
| JP2003153214A (en) * | 2001-11-09 | 2003-05-23 | Lsi Japan Kk | Caption program data converter |
| US6734917B2 (en) * | 2000-01-17 | 2004-05-11 | Lg Electronics, Inc. | Television caption data and method for composing television caption data |
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2004
- 2004-08-16 CN CNB200410058456XA patent/CN100364321C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062103C (en) * | 1992-10-12 | 2001-02-14 | 株式会社金星社 | Apparatus and method for controlling caption display |
| JPH0730814A (en) * | 1993-07-09 | 1995-01-31 | Nec Corp | Title super transmission system |
| US6734917B2 (en) * | 2000-01-17 | 2004-05-11 | Lg Electronics, Inc. | Television caption data and method for composing television caption data |
| JP2003018128A (en) * | 2001-07-04 | 2003-01-17 | Sony Corp | Data processor |
| JP2003153214A (en) * | 2001-11-09 | 2003-05-23 | Lsi Japan Kk | Caption program data converter |
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| CN1738385A (en) | 2006-02-22 |
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