CN201127093Y - Mobile multimedia broadcast terminal - Google Patents
Mobile multimedia broadcast terminal Download PDFInfo
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- CN201127093Y CN201127093Y CN 200720176020 CN200720176020U CN201127093Y CN 201127093 Y CN201127093 Y CN 201127093Y CN 200720176020 CN200720176020 CN 200720176020 CN 200720176020 U CN200720176020 U CN 200720176020U CN 201127093 Y CN201127093 Y CN 201127093Y
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Abstract
The utility model provides a mobile multimedia broadcast terminal, comprising a parsing apparatus receiving and parsing the multiplex frame, a checking apparatus connected to the parsing apparatus, an information extracting apparatus, an information positioning apparatus connected to the checking apparatus, a storage apparatus connected to the information extracting apparatus, a computing apparatus connected to the positioning apparatus and the storage apparatus respectively, wherein the positioning apparatus is further connected with storage apparatus. The device fully utilizes next frame parameter and length information of multiplex frame last received and correctly parsed to extract video and audio data of the object multiplex sub-frame from the object multiplex frame when CRC check of object video segment head and audio segment head error. Comparing with the prior art, dropping data of the whole multiplex frame by the terminal due to CRC check error of the multiplex frame is avoided, receiving performance of the terminal with the proviso of error code is greatly enhanced, and the situation that image and sound of the terminal severely interrupts is effectively improved.
Description
Technical field
The utility model relates to a kind of mobile multi-media broadcast terminal, relates in particular to the high mobile multi-media broadcast terminal of a kind of receptivity.
Background technology
In recent years, digital mobile multimedia broadcasting technology and standard evolution are rapid, Ou Zhou DVB-H (Digital Video Broadcast Handheld for example, the reception of digital video broadcast-handheld formula), MediaFLO (the Media Forward Link Only of the U.S., the single forward link of medium) and China CMMB (China Mobile Multimedia Broadcasting, Mobile Multimedia Broadcasting) etc., for its terminal use provides many service content, as programs such as advertisement, weather forecast, news, sports cast, variety, multimedia broadcasting play, films.The user can select the service program of Mobile Multimedia Broadcasting according to the hobby of oneself.
In the CMMB of China standard, Mobile Multimedia Broadcasting adopts time division way to send MBMS service.The duration of a broadcast channel frame is 1 second, is made up of 40 25 milliseconds of time slots.One or more time slots can carry the data of a multiplexed frame (Multiplexing Frame is called for short MF) encapsulation.One and another multiplexed frame sends continuously, passes to information such as terminal sound, image.
The CMMB system carries out multimedia broadcasting by air traffic channel.Because wireless environment is very complicated,, also can't avoid occurring the situation of channel error code even if when broadcasting, adopted the chnnel coding of excellent performance.Mobile multi-media broadcast terminal relates to video paragraph header and audio frequency paragraph header CRC check when the data that receive being carried out the demultiplexing processing.General way is when the CRC of video paragraph header and audio frequency paragraph header carries out verification at present, if detect crc error, terminal just abandons all data of this multiplexed sub frame.
Because multiplexed frame was that unit carries out multiplexing to business with one second, therefore detect crc error, terminal just directly abandons the operation of whole multiplexing data, this all video datas and voice data that is equivalent to be transmitted in one second all abandons, and directly causes the picture of terminal and sound to occur serious interrupted.Such processing procedure just causes the reception of terminal very responsive to channel bit error rate, and anti-error ratio characteristic is very poor, has seriously reduced the receiving efficiency of data, has influenced user's sound and has drawn the smooth degree of experiencing.
The utility model content
Technical problem to be solved in the utility model provides a kind of mobile multi-media broadcast terminal, still can extract each video/audio cell data in the multiplexed sub frame that receives during video/audio paragraph header CRC check mistake.
In order to solve the problems of the technologies described above, the utility model provides a kind of mobile multi-media broadcast terminal, described terminal comprises resolver, calibration equipment, information extracting device, storage device, positioner and calculation element, described resolver, calibration equipment, information extracting device, storage device connect successively, described positioner is connected respectively with storage device with described calibration equipment, and described calculation element is connected with storage device with described positioner respectively.
Further, described resolver receives multiplexed frame and multiplexed frame is resolved, and again video-frequency band paragraph header length in the target multiplexed sub frame that parses and audio section paragraph header length is exported to calibration equipment;
Described calibration equipment receives the parsing content of described resolver output, and the paragraph header of described video-frequency band and audio section is carried out cyclic redundancy check (CRC), and check results is sent to described information extracting device and positioner respectively;
After described information extracting device receives the correct result of described calibration equipment verification, video unit and audio unit in the described target multiplexed sub frame are handled, obtain the relative reproduction time of video-frequency band head length degree and audio section head length degree and last video unit and last audio unit, and it is saved in the storage device;
After described positioner receives the result of calibration equipment check errors, from storage device, read the last correct video/audio paragraph header length that obtains of resolving, locate the video/audio paragraph header position in the described target multiplexed sub frame and the video/audio unit of target multiplexed sub frame;
The video/audio unit of the described target multiplexed sub frame that described calculation element receiving positioner is located, and from storage device, read the last correct relative reproduction time of resolving last the video/audio unit that obtains, calculate the initial reproduction time of each video/audio unit of described target multiplexed sub frame.
Further, described terminal also comprises a summing unit, described summing unit reads the last correct video/audio paragraph header length that obtains of resolving from storage device, the length that adds cyclic redundancy check (CRC) code obtains a jump value, and described jump value exported to described positioner, described positioner is skipped the jump value that described summing unit sends from a subframe end position of described target multiplexed sub frame, locatees the video/audio paragraph header position in the described target multiplexed sub frame.
Further, describedly decide device and also link to each other with described resolver, described resolver parses the video unit initial code identifier and the audio unit initial code identifier of target multiplexed frame from described multiplexed frame, and export to positioner, described positioner is located the video unit of described target multiplexed sub frame by the video unit initial code identifier of described target multiplexed sub frame; Locate the audio unit of described target multiplexed sub frame by the audio unit initial code identifier of described target multiplexed sub frame.
As a kind of selection scheme, described calculation element is an adding up device, described adding up device reads the last correct relative reproduction time of resolving last video unit that obtains from storage device, add the reproduction time of each video unit that locating module is located, obtain the initial reproduction time of each video unit; Described adding up device reads the last correct relative reproduction time of resolving last audio unit that obtains from storage device, add the reproduction time of each audio unit that locating module is located, and obtains the initial reproduction time of each audio unit.
Terminal provided by the utility model is when target video paragraph header and audio frequency paragraph header CRC check mistake, make full use of next frame parameter and multiplex frame head length information in the multiplexed frame that the last time receives and correctly resolve, from the target multiplexed frame, extract the video data and the voice data of target multiplexed sub frame.Compared with prior art, avoided terminal to abandon whole multiplexed frame data because of multiplex frame head CRC check mistake, obviously improved the receptivity of terminal under the error code condition, serious interrupted situation appears in the picture and the sound that have improved terminal.
Description of drawings
Fig. 1 is the structured flowchart of a kind of embodiment of mobile multi-media broadcast terminal of the present utility model.
Embodiment
Before the utility model is described in further detail, earlier the design feature of multiplexed sub frame is carried out simple declaration:
(A) for a multiplexed frame, the length of each multiplexed sub frame is except obtaining from multiplex frame head in the multiplexed frame, also have another method also can obtain: when the subframe header parsing of multiplexed sub frame is correct, with the byte is unit, 32 yards+each message segment length of the CRC of the length of multiplexed sub frame=subframe head length degree+4 bytes;
(B) the relative reproduction time in a plurality of video/audios unit that comprises in the video/audio paragraph header, except multiplexed sub frame head CRC when correct, according to the relative reproduction time in the multiplexed sub frame head is with reference to outside being offset, also has another method, do not rely on the initial reproduction time in the multiplexed sub frame head, but by the correct relative reproduction time that obtains of resolving of the last time for reference to being offset, and the latter also is a method in common more.
Do not have in terminal under the situation of service switchover, terminal is in the processing procedure of carrying out multiplexed frame, obtain in the target multiplexed sub frame after the video-frequency band paragraph header length and audio section paragraph header length, to video-frequency band paragraph header/when the audio section paragraph header carries out the CRC check mistake, can utilize the last correct video paragraph header/audio section head length degree information that obtains of resolving, obtain the video-frequency band head length degree/audio section head length degree information in the target multiplexed sub frame.
Therefore, thinking of the present utility model is: terminal is in obtaining the target multiplexed sub frame after video-frequency band paragraph header length and the audio section paragraph header length, if video-frequency band paragraph header/audio section paragraph header is carried out the CRC check mistake, then by making full use of the last correct video paragraph header/audio section head length degree information that obtains of resolving, obtain the video-frequency band head length degree/audio section head length degree information in the target multiplexed sub frame, and from the target multiplexed sub frame, extract as much as possible and remove relevant video data and voice data.So just avoided terminal to abandon whole multiplexing data because of video-frequency band paragraph header/audio section paragraph header CRC check mistake, serious interrupted thereby terminal picture that causes and sound occur, influence the problem that user's sound is drawn the smooth degree of experiencing.
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, mobile multi-media broadcast terminal provided by the utility model comprises:
Resolver 701 is used to receive multiplexed frame and multiplexed frame is resolved, and the content after will resolving is again exported to calibration equipment; Content after the described parsing comprises video-frequency band paragraph header length and audio section paragraph header length in the target multiplexed sub frame, can also comprise the video unit initial code identifier and the audio unit initial code identifier of target multiplexed frame;
Calibration equipment 702, link to each other with resolver 701, be used to receive the parsing content of described resolver output, the paragraph header of described video-frequency band and audio section is carried out cyclic redundancy check (CRC), this calibration equipment sends to information extracting device and positioner respectively with check results;
Information extracting device 707, link to each other with calibration equipment 702, be used for after receiving the correct result of described calibration equipment verification, video unit and audio unit in the described target multiplexed sub frame are handled, obtain the relative reproduction time of video-frequency band head length degree and audio section head length degree and last video unit and last audio unit, and it is kept in the storage device 703;
Positioner 704, link to each other with storage device 703 with calibration equipment 702, be used for behind the result who receives described calibration equipment check errors, from storage device, read the last correct video/audio paragraph header length that obtains of resolving, locate the video/audio paragraph header position in the described target multiplexed sub frame and the video/audio unit of target multiplexed sub frame;
Calculation element 705, link to each other with storage device 703 with positioner 704, the video/audio unit that is used for the target multiplexed sub frame that receiving positioner locatees, and from storage device, read the last correct relative reproduction time of resolving last the video/audio unit that obtains, calculate the initial reproduction time of each video/audio unit of described target multiplexed sub frame.
Wherein, calculation element 705 can be an adding up device, adding up device reads the last correct relative reproduction time of resolving last video unit that obtains from storage device, add the reproduction time of each video unit that locating module is located, obtain the initial reproduction time of each video unit; Adding up device reads the last correct relative reproduction time of resolving last audio unit that obtains from storage device, add the reproduction time of each audio unit that locating module is located, and obtains the initial reproduction time of each audio unit.
In addition, positioner 704 can link to each other with storage device 703 by a summing unit 706, summing unit 706 reads the last correct video/audio paragraph header length that obtains of resolving from storage device, the length that adds cyclic redundancy check (CRC) code obtains a jump value, summing unit should the jump value be exported to positioner, described positioner is from a subframe end position of target multiplexed sub frame, skip the jump value that summing unit sends, locate the video/audio paragraph header position in the described target multiplexed sub frame;
Positioner 704 can also link to each other with resolver 701, resolver parses the video unit initial code identifier and the audio unit initial code identifier of target multiplexed frame from described multiplexed frame, and export to positioner, described positioner is located the video unit of described target multiplexed sub frame by the video unit initial code identifier of described target multiplexed sub frame; Locate the audio unit of described target multiplexed sub frame by the audio unit initial code identifier of described target multiplexed sub frame.
Terminal of the present utility model can improve the receptivity of multimedia broadcasting in the following manner:
Terminal is before carrying out CRC check to the video-frequency band in the target multiplexed sub frame/audio section paragraph header, for video-frequency band paragraph header/audio section paragraph header that CRC check is correct in the multiplexed sub frame of receiving before, after video unit and audio unit being handled by information extracting device, with video-frequency band head length degree and audio section head length degree, and the relative reproduction time of last video unit and last audio unit is kept in the storage device.
Terminal is to the video-frequency band in the target multiplexed sub frame/when the audio section paragraph header carries out CRC check, at first, by resolver the multiplexed frame that receives is resolved, after video-frequency band paragraph header length and the audio section paragraph header length, utilize calibration equipment that the video-frequency band of target multiplexed sub frame and the paragraph header of audio section are carried out the CRC_32 verification in the acquisition target multiplexed sub frame;
If verification is correct, by information extracting device video unit in the target multiplexed sub frame and audio unit are handled, obtain video-frequency band head length degree and audio section head length degree, the length of each video and audio unit, the relative reproduction time of each video and audio unit, and the data message of each video and audio unit; And with video-frequency band head length degree and audio section head length degree, and the relative reproduction time of last video unit and last audio unit is kept in the storage device processing procedure end of video-frequency band and audio section;
If check errors, from memory module, read the last correct video/audio paragraph header length that obtains of resolving by summing unit, the length that adds cyclic redundancy check (CRC) code obtains a jump value, summing unit should the jump value be exported to positioner, positioner is from a subframe end position of target multiplexed sub frame, skip the jump value that summing unit sends, locate the video/audio paragraph header position in the described target multiplexed sub frame; Search out video unit initial code identifier/audio unit initial code identifier, the video/audio unit of localizing objects multiplexed sub frame by positioner then; Be offset according to the last correct relative reproduction time of being preserved in the storage device of resolving last video/audio unit of multiplexed sub frame in this multiplexed frame that multiplexed frame obtains again, calculate the initial reproduction time of each video/audio unit of target multiplexed sub frame by calculation element, finish the processing procedure of video-frequency band and audio section.
The utility model is in the target multiplexed sub frame when video paragraph header and audio frequency paragraph header CRC check mistake, making full use of video paragraph header and the audio section head length degree information that the last time receives and correctly resolve positions and resolves video unit in the target multiplexed sub frame and audio unit, and adopt video unit initial code identifier and audio unit initial code identifier to come positioning video unit and audio unit respectively, extract relevant video data and voice data, also receive and correctly resolve the reproduction time that obtains is offset according to the last time, obtain the reproduction time of video unit and audio unit, avoided terminal and abandoned whole multiplexed frame data because of multiplex frame head and multiplexed sub frame head crc error, improve the receptivity of terminal under the error code condition significantly, serious interrupted situation appears in the picture and the sound that have improved terminal and cause because abandon the multiplexed frame data during multiplex frame head CRC check mistake.
Certainly; the utility model also can have other various embodiments; under the situation that does not deviate from the utility model spirit and essence thereof; those skilled in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong within the protection range of the appended claim of the utility model.
Claims (5)
1, a kind of mobile multi-media broadcast terminal, it is characterized in that, described terminal comprises resolver, calibration equipment, information extracting device, storage device, positioner and calculation element, described resolver, calibration equipment, information extracting device, storage device connect successively, described positioner is connected respectively with storage device with described calibration equipment, and described calculation element is connected with storage device with described positioner respectively.
2, terminal as claimed in claim 1 is characterized in that,
Described resolver receives multiplexed frame and multiplexed frame is resolved, and again video-frequency band paragraph header length in the target multiplexed sub frame that parses and audio section paragraph header length is exported to calibration equipment;
Described calibration equipment receives the parsing content of described resolver output, and the paragraph header of described video-frequency band and audio section is carried out cyclic redundancy check (CRC), and check results is sent to described information extracting device and positioner respectively;
After described information extracting device receives the correct result of described calibration equipment verification, video unit and audio unit in the described target multiplexed sub frame are handled, obtain the relative reproduction time of video-frequency band head length degree and audio section head length degree and last video unit and last audio unit, and it is saved in the storage device;
After described positioner receives the result of calibration equipment check errors, from storage device, read the last correct video/audio paragraph header length that obtains of resolving, locate the video/audio paragraph header position in the described target multiplexed sub frame and the video/audio unit of target multiplexed sub frame;
The video/audio unit of the described target multiplexed sub frame that described calculation element receiving positioner is located, and from storage device, read the last correct relative reproduction time of resolving last the video/audio unit that obtains, calculate the initial reproduction time of each video/audio unit of described target multiplexed sub frame.
3, terminal as claimed in claim 2, it is characterized in that, also comprise a summing unit, described summing unit reads the last correct video/audio paragraph header length that obtains of resolving from storage device, the length that adds cyclic redundancy check (CRC) code obtains a jump value, and described jump value exported to described positioner, described positioner is from a subframe end position of described target multiplexed sub frame, skip the jump value that described summing unit sends, locate the video/audio paragraph header position in the described target multiplexed sub frame.
4, terminal as claimed in claim 2, it is characterized in that, describedly decide device and also link to each other with described resolver, described resolver parses the video unit initial code identifier and the audio unit initial code identifier of target multiplexed frame from described multiplexed frame, and export to positioner, described positioner is located the video unit of described target multiplexed sub frame by the video unit initial code identifier of described target multiplexed sub frame; Locate the audio unit of described target multiplexed sub frame by the audio unit initial code identifier of described target multiplexed sub frame.
5, terminal as claimed in claim 2, it is characterized in that, described calculation element is an adding up device, described adding up device reads the last correct relative reproduction time of resolving last video unit that obtains from storage device, add the reproduction time of each video unit that locating module is located, obtain the initial reproduction time of each video unit; Described adding up device reads the last correct relative reproduction time of resolving last audio unit that obtains from storage device, add the reproduction time of each audio unit that locating module is located, and obtains the initial reproduction time of each audio unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720176020 CN201127093Y (en) | 2007-09-19 | 2007-09-19 | Mobile multimedia broadcast terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720176020 CN201127093Y (en) | 2007-09-19 | 2007-09-19 | Mobile multimedia broadcast terminal |
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| CN201127093Y true CN201127093Y (en) | 2008-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200720176020 Expired - Lifetime CN201127093Y (en) | 2007-09-19 | 2007-09-19 | Mobile multimedia broadcast terminal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783955A (en) * | 2010-03-24 | 2010-07-21 | 杭州华三通信技术有限公司 | Data recovering method when data is abnormal and equipment thereof |
| CN106303517A (en) * | 2016-08-16 | 2017-01-04 | 合肥东上多媒体科技有限公司 | Digital multimedia broadcasting terminal |
| CN106686466A (en) * | 2017-01-10 | 2017-05-17 | 武汉卓威视讯科技有限公司 | Video data positioning method |
-
2007
- 2007-09-19 CN CN 200720176020 patent/CN201127093Y/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783955A (en) * | 2010-03-24 | 2010-07-21 | 杭州华三通信技术有限公司 | Data recovering method when data is abnormal and equipment thereof |
| CN101783955B (en) * | 2010-03-24 | 2012-11-21 | 浙江宇视科技有限公司 | Data recovering method when data is abnormal and equipment thereof |
| CN106303517A (en) * | 2016-08-16 | 2017-01-04 | 合肥东上多媒体科技有限公司 | Digital multimedia broadcasting terminal |
| CN106303517B (en) * | 2016-08-16 | 2019-02-22 | 江苏凌渡软件科技有限公司 | Digital multimedia broadcasting terminal |
| CN106686466A (en) * | 2017-01-10 | 2017-05-17 | 武汉卓威视讯科技有限公司 | Video data positioning method |
| CN106686466B (en) * | 2017-01-10 | 2020-10-23 | 深圳市芯睿视科技有限公司 | Video data positioning method |
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