CN201127092Y - Mobile multimedia broadcast terminal - Google Patents
Mobile multimedia broadcast terminal Download PDFInfo
- Publication number
- CN201127092Y CN201127092Y CN 200720176018 CN200720176018U CN201127092Y CN 201127092 Y CN201127092 Y CN 201127092Y CN 200720176018 CN200720176018 CN 200720176018 CN 200720176018 U CN200720176018 U CN 200720176018U CN 201127092 Y CN201127092 Y CN 201127092Y
- Authority
- CN
- China
- Prior art keywords
- frame
- multiplexed
- sub frame
- multiplexed sub
- resolver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
The utility model provides a mobile multimedia broadcast terminal, comprising an acquisition apparatus for acquiring length and content of multiplex frame head, a checking apparatus connected to the acquisition apparatus, a first parsing apparatus and a second parsing apparatus connected to the checking apparatus, an object multiplex sub-frame acquisition apparatus connected to the first and second parsing apparatus respectively. The device is capable of fully utilizing length information of multiplex frame last received and correctly parsed to extract object multiplex sub-frame from the current multiplex frame when CRC check of multiplex frame head errors. Comparing with the prior art, dropping data of the whole multiplex frame by the receiving 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 terminal, relates in particular to a kind of mobile multi-media broadcast terminal of high 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 the multiplex frame head CRC check when the data that receive being carried out the demultiplexing processing.General way is that CRC check is calculated at present, if detect crc error, terminal just abandons all data of this multiplexed frame.
Because multiplexed frame was that unit carries out multiplexing to business with one second, therefore detect the multiplex frame head crc error, terminal just directly abandons the operation of the data of a multiplexed frame, 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 is to be a kind of mobile multi-media broadcast terminal need be provided, and improves the receptivity of terminal when obtaining the target multiplexed sub frame according to the multiplexed frame that receives.
In order to solve the problems of the technologies described above, the utility model provides a kind of mobile multi-media broadcast terminal, comprises deriving means, calibration equipment, storage device, first resolver, second resolver and target multiplexed sub frame deriving means; Described deriving means, calibration equipment and storage device are connected successively; Described first resolver is connected with calibration equipment respectively with second resolver; Described target multiplexed sub frame deriving means is connected with second resolver with first resolver respectively.
Further, described deriving means obtains the multiplex frame head length and the multiplex frame head data of multiplexed frame and exports to described calibration equipment;
Described calibration equipment receives the multiplex frame head that described deriving means obtains to carry out cyclic redundancy check (CRC) and check results is exported to described first resolver and second resolver it;
Described first resolver is resolved the original position of the length that obtains each multiplexed sub frame in the multiplexed frame and target multiplexed sub frame and will be resolved content and export to target multiplexed sub frame deriving means to multiplex frame head behind the correct result of the verification that receives calibration equipment output;
The multiplex frame head length of the multiplexed frame that described second resolver is correctly resolved according to the last time behind the result of the check errors that receives calibration equipment output, determine the original position of multiplexed sub frame 1 in the described multiplexed frame, the subframe head of described multiplexed sub frame 1 is resolved the original position of the sequence number of the original position that obtains described multiplexed sub frame 1 and length, target multiplexed sub frame and target multiplexed sub frame head and will be resolved content and export to target multiplexed sub frame deriving means;
Described target multiplexed sub frame deriving means receives the parsing content of first resolver or the output of second resolver and obtains the target multiplexed sub frame.
As a kind of selection scheme, described first resolver is a summing unit, described summing unit is unit with the byte, with each multiplexed sub frame length sum before described multiplex frame head length, cyclic redundancy check (CRC) code length and the described target multiplexed sub frame as deviant, obtain the original position of described target multiplexed sub frame, and the original position of described target multiplexed sub frame is exported to target multiplexed sub frame deriving means.
As a kind of selection scheme, described second resolver is a judgment means; Described judgment means judges in the last correct multiplexed frame of resolving whether preserve next frame parameter, if having then obtain the original position and the length of the multiplexed sub frame 1 in this multiplexed frame that receives and export to described target multiplexed sub frame deriving means according to the information in this next frame parameter.
Further, described judgment means obtains the original position of described multiplexed sub frame 1 by adding the length of cyclic redundancy check (CRC) code in the multiplex frame head length of the multiplexed frame that receives next time in the described next frame parameter.
As another kind of selection scheme, described second resolver comprises locating module, subframe verification module, reorientation module and subframe header parsing module:
Described locating module is according to the multiplex frame head length of correct multiplexed frame of resolving of described the last time, and the original position of multiplexed sub frame 1 in the described multiplexed frame is positioned;
The subframe head of the original position correspondence of the multiplexed sub frame 1 that described subframe verification module is located locating module carries out cyclic redundancy check (CRC), when check results is correct, the result is exported to subframe header parsing module; When the check results mistake, the result is exported to the reorientation module;
Described reorientation module is at the check errors that receives subframe verification module as a result the time, the multiplex frame head length of correct multiplexed frame of resolving of described the last time is increased or reduce the integral multiple of 3 bytes, and the original position to multiplexed sub frame 1 in the described multiplexed frame positions once more; The result that described reorientation module will be reorientated exports to described subframe verification module;
Described subframe header parsing module is correct as a result the time in the verification that receives subframe verification module, and the described multiplexed sub frame 1 of having determined original position is carried out the subframe header parsing, obtains the length of described multiplexed sub frame 1.
Further, described equipment also comprises a management devices; Described management devices is controlled original position and the length of second resolver according to described multiplexed sub frame 1, determines described target the multiplexed sub frame original position and the length of each multiplexed sub frame before successively, finally obtains the original position of described target multiplexed sub frame head.
Further, described equipment also comprises a scavenge unit; During the subframe of described scavenge unit each multiplexed sub frame and target multiplexed sub frame before described target multiplexed sub frame cyclic redundancy check error, stop to resolve the multiplexed frame that this receives, and remove the multiplex frame head length information that is kept in the buffer area.
Terminal of the present utility model can make full use of the multiplex frame head length information of the multiplexed frame that the last time receives and correctly resolve when multiplex frame head CRC check mistake, extract the target multiplexed sub frame from current multiplexed frame.Compared with prior art, avoided receiving 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 effectively 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;
Fig. 2 is the structured flowchart of a kind of embodiment of second parsing module in the utility model.
Embodiment
Before the utility model is described in further detail, earlier the design feature of multiplexed frame is simply introduced:
(A) with the byte be unit, length+padding data length+4 byte CRC, 32 data lengths of each multiplexed sub frame in the length of multiplexed frame=multiplex frame head length+multiplexed frame;
(B) the multiplex frame head length of different multiplexed frames just can occur changing when only multiplexed sub frame quantity increases or reduces in these multiplexed frames.And to change be clocklike, every increase or reduce by a multiplexed sub frame, and the frame head length of multiplexed frame will increase or reduce 3 bytes;
(C) 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.
Do not have in terminal under the situation of service switchover, when the CRC check mistake appearred in multiplex frame head, if can correctly find the original position of each multiplexed sub frame in the multiplexed frame, receiving terminal just can continue to resolve each multiplexed sub frame in the multiplexed frame.
Thinking of the present utility model is: terminal is in detecting current multiplexed frame under the vicious situation of multiplex frame head CRC, the next frame parameter information and the multiplex frame head length thereof that provide in the multiplexed frame of receiving according to the last time, carry out the location and the demultiplexing of target multiplexed sub frame in the current multiplexed frame, from current multiplexed frame, extract relevant multiplexed sub frame as much as possible, improve the receptivity of terminal.
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.
Of the present utility model a kind of embodiment as shown in Figure 1 comprises deriving means 101, calibration equipment 102, first resolver 103, second resolver 104 and target multiplexed sub frame deriving means 105, specifies as follows:
Deriving means 101 is used to obtain the multiplex frame head length and the multiplex frame head data of multiplexed frame;
Target multiplexed sub frame deriving means 105 links to each other with second resolver with first resolver respectively, is used to receive the parsing content of first resolver or the output of second resolver and obtain the target multiplexed sub frame.
Wherein,
Also be connected with a storage device 107 on the calibration equipment 102, be used to receive the check results of calibration equipment, when the result is correct, check whether comprise next frame parameter in the described multiplex frame head, when comprising this next frame parameter is preserved; The content of described next frame parameter comprises in the multiplex frame head length of the multiplexed frame that receives and the length of multiplexed sub frame 1 next time;
Also be connected with management devices 109 and scavenge unit 108 on second resolver 104, management devices 109 is used to control original position and the length of second resolver according to described multiplexed sub frame 1, determine described target the multiplexed sub frame original position and the length of each multiplexed sub frame before successively, finally obtain the original position of described target multiplexed sub frame head; When scavenge unit 108 is used for subframe the cyclic redundancy check error of each multiplexed sub frame and target multiplexed sub frame before described target multiplexed sub frame, stops to resolve the multiplexed frame that this receives, and remove the multiplex frame head length information that is kept in the buffer area.
Locating module 201 is used for the multiplex frame head length according to correct multiplexed frame of resolving of the last time, and the original position of multiplexed sub frame in the multiplexed frame 1 is positioned;
Subframe verification module 202 links to each other with locating module, is used for the pairing subframe head of original position of the multiplexed sub frame 1 of being located is carried out cyclic redundancy check (CRC); When check results is correct, the result is exported to subframe header parsing module, when the check results mistake, the result is exported to the reorientation module;
Reorientation module 203, link to each other with subframe verification module, be used at the check errors that receives subframe verification module as a result the time, the multiplex frame head length of correct multiplexed frame of resolving of described the last time is increased or reduce the integral multiple of 3 bytes, and the original position to multiplexed sub frame 1 in the described multiplexed frame positions once more; The result that the reorientation module will be reorientated exports to subframe verification module;
Subframe header parsing module 204 links to each other with the verification module, is used in the verification that receives subframe verification module correctly as a result the time, and the described multiplexed sub frame 1 of having determined original position is carried out the subframe header parsing, obtains the length of described multiplexed sub frame 1.
The utility model with the receptivity of mobile multi-media broadcast terminal improve in the following manner:
At first, obtain the multiplex frame head length of multiplexed frame and preserve,, then this next frame parameter is also preserved if also comprise next frame parameter in this multiplexed frame by deriving means;
Then, calibration equipment carries out CRC check to the frame head of this multiplexed frame that receives, when the frame head CRC check mistake of this multiplexed frame that receives, the frame head length information of the multiplexed frame of being received and correctly being resolved by locating module utilization the last time is directly skipped the original position of a deviant as multiplexed sub frame 1, deviant wherein is a unit with the byte, equals the CRC sign indicating number of frame head length+4 bytes of buffer memory;
Again, by the original position of subframe verification module according to determined multiplexed sub frame 1, multiplexed sub frame 1 is carried out a subframe header parsing and a subframe CRC check, an if subframe CRC check mistake, then stop to resolve the multiplexed frame that this receives, and remove the information such as multiplex frame head length that kept in the buffer area by scavenge unit; Otherwise, can obtain the length of multiplexed sub frame 1 by the subframe parsing module;
At last, according to the original position and the length of multiplexed sub frame 1, and the sequence number of target multiplexed sub frame, can obtain the original position of target multiplexed sub frame, and then obtain described target multiplexed sub frame.
If a subframe CRC check mistake of certain multiplexed sub frame then stops to resolve the multiplexed frame that this receives before the target multiplexed sub frame, and remove the information such as multiplex frame head length that kept in the buffer area.
In obtaining the starting position process of target multiplexed sub frame, each multiplexed sub frame subframe head before the target multiplexed sub frame is resolved and CRC check, if the CRC check mistake then stops to resolve the multiplexed frame that this receives, and remove the information such as multiplex frame head length that keep in the buffer area.Specifically be exactly, to obtain the original position of multiplexed sub frame 2 according to the original position and multiplexed sub frame 1 length of multiplexed sub frame 1; Subframe head to multiplexed sub frame 2 is resolved and CRC check, if a subframe CRC check mistake stops to resolve the multiplexed frame that this receives, and removes the information such as multiplex frame head length that keep in the buffer area; Otherwise, can obtain the original position of multiplexed sub frame 3 according to the length of multiplexed sub frame 2; Similarly, up to the starting position of finding the target multiplexed sub frame.
The utility model is when target multiplex frame head CRC check mistake, the next frame parameter information and the multiplex frame head length information thereof that provide in the last correct multiplexed frame of resolving are provided to be positioned and demultiplexing the target multiplexed sub frame, from the target multiplexed frame, extract relevant video data and voice data, 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 (9)
1, a kind of mobile multi-media broadcast terminal is characterized in that, comprises deriving means, calibration equipment, storage device, first resolver, second resolver and target multiplexed sub frame deriving means; Described deriving means, calibration equipment and storage device are connected successively; Described first resolver is connected with calibration equipment respectively with second resolver; Described target multiplexed sub frame deriving means is connected with second resolver with first resolver respectively.
2, terminal as claimed in claim 1 is characterized in that,
Described deriving means obtains multiplex frame head length and multiplex frame head data and exports to described calibration equipment from received multiplexing of terminal;
Described calibration equipment links to each other with deriving means, receives the multiplex frame head that described deriving means obtains, and it is carried out cyclic redundancy check (CRC), and check results is exported to described first resolver and second resolver;
Described first resolver links to each other with calibration equipment, behind the correct result of the verification that receives calibration equipment output, multiplex frame head is resolved, the length of each multiplexed sub frame in the multiplexed frame and the start position information of target multiplexed sub frame are exported to target multiplexed sub frame deriving means;
Described second resolver links to each other with calibration equipment, behind the result of the check errors that receives calibration equipment output, multiplex frame head length according to correct multiplexed frame of resolving of the last time, determine the sequence number of target multiplexed sub frame in the described multiplexed frame and the original position of target multiplexed sub frame head, export to target multiplexed sub frame deriving means;
Described target multiplexed sub frame deriving means links to each other with second resolver with first resolver respectively, receives the content of first resolver or second resolver output and obtains the target multiplexed sub frame.
3, terminal as claimed in claim 2, it is characterized in that, described first resolver is a summing unit, described summing unit is unit with the byte, with each multiplexed sub frame length sum before described multiplex frame head length, cyclic redundancy check (CRC) code length and the described target multiplexed sub frame as deviant, obtain the original position of described target multiplexed sub frame, and the original position of described target multiplexed sub frame is exported to target multiplexed sub frame deriving means.
4, terminal as claimed in claim 2 is characterized in that, also comprises a storage device;
Described storage device receives the check results of calibration equipment, when the result is correct, check whether comprise next frame parameter in the described multiplex frame head, will comprise when comprising that this next frame parameter of the length information of the multiplex frame head length of next multiplexed frame and multiplexed sub frame 1 is preserved.
5, terminal as claimed in claim 4 is characterized in that, described second resolver is a judgment means; Described judgment means judges in the last correct multiplexed frame of resolving whether preserve next frame parameter, if having then obtain the original position and the length of the multiplexed sub frame 1 in this multiplexed frame that receives and export to described target multiplexed sub frame deriving means according to the information in this next frame parameter.
6, terminal as claimed in claim 5, it is characterized in that, described judgment means obtains the original position of described multiplexed sub frame 1 by adding the length of cyclic redundancy check (CRC) code in the multiplex frame head length of the multiplexed frame that receives next time in the described next frame parameter.
7, terminal as claimed in claim 2 is characterized in that, described second resolver comprises locating module, subframe verification module, reorientation module and subframe header parsing module:
Described locating module is according to the multiplex frame head length of correct multiplexed frame of resolving of described the last time, and the original position of multiplexed sub frame 1 in the described multiplexed frame is positioned;
The subframe head of the original position correspondence of the multiplexed sub frame 1 that described subframe verification module is located locating module carries out cyclic redundancy check (CRC), when check results is correct, the result is exported to subframe header parsing module; When the check results mistake, the result is exported to the reorientation module;
Described reorientation module is at the check errors that receives subframe verification module as a result the time, the multiplex frame head length of correct multiplexed frame of resolving of described the last time is increased or reduce the integral multiple of 3 bytes, and the original position to multiplexed sub frame 1 in the described multiplexed frame positions once more; The result that described reorientation module will be reorientated exports to described subframe verification module;
Described subframe header parsing module is correct as a result the time in the verification that receives subframe verification module, and the described multiplexed sub frame 1 of having determined original position is carried out the subframe header parsing, obtains the length of described multiplexed sub frame 1.
8, terminal as claimed in claim 2 is characterized in that, also comprises a management devices;
Described management devices is controlled original position and the length of second resolver according to described multiplexed sub frame 1, determines described target the multiplexed sub frame original position and the length of each multiplexed sub frame before successively, finally obtains the original position of described target multiplexed sub frame head.
9, terminal as claimed in claim 8 is characterized in that, also comprises a scavenge unit;
During the subframe of described scavenge unit each multiplexed sub frame and target multiplexed sub frame before described target multiplexed sub frame cyclic redundancy check error, stop to resolve the multiplexed frame that this receives, and remove the multiplex frame head length information that is kept in the buffer area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720176018 CN201127092Y (en) | 2007-09-19 | 2007-09-19 | Mobile multimedia broadcast terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200720176018 CN201127092Y (en) | 2007-09-19 | 2007-09-19 | Mobile multimedia broadcast terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201127092Y true CN201127092Y (en) | 2008-10-01 |
Family
ID=40000555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200720176018 Expired - Lifetime CN201127092Y (en) | 2007-09-19 | 2007-09-19 | Mobile multimedia broadcast terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201127092Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607258A (en) * | 2013-11-18 | 2014-02-26 | 深圳市道通科技有限公司 | Method, device and system for communication between primary device and secondary device in vehicle computer diagnosis device |
-
2007
- 2007-09-19 CN CN 200720176018 patent/CN201127092Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607258A (en) * | 2013-11-18 | 2014-02-26 | 深圳市道通科技有限公司 | Method, device and system for communication between primary device and secondary device in vehicle computer diagnosis device |
| CN103607258B (en) * | 2013-11-18 | 2018-07-06 | 深圳市道通科技股份有限公司 | The communication means of master-slave equipment, apparatus and system in Development in Vehicle On-Board Diagnostics equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100531401C (en) | Method for improving receiving performance of mobile multimedia broadcasting terminal | |
| CN101142778B (en) | Improved ip datagram de-encapsulation | |
| US7940798B2 (en) | Burst transmission | |
| CN101631064B (en) | Method, device and system for sending and receiving data | |
| US9148254B2 (en) | Variable interleave data transmission | |
| CN101379814A (en) | Apparatus and method for receiving data in a mobile broadcasting terminal | |
| CN1993964A (en) | Encapsulator and an associated method and computer program product for encapsulating data packets | |
| CN101325720B (en) | Data fault-tolerant terminal and method | |
| CN101272221B (en) | Transmission, receiving method and device of file data | |
| CN100551077C (en) | A kind of data processing method of mobile multi-media terminal | |
| CN100574452C (en) | A kind of method that improves receiving performance of mobile multimedia broadcasting terminal | |
| KR20150012816A (en) | Transmitting apparatus and receiving apparatus and control method thereof | |
| CN201127093Y (en) | Mobile multimedia broadcast terminal | |
| CN201127092Y (en) | Mobile multimedia broadcast terminal | |
| CN101102171B (en) | A data processing method of mobile multi-media terminal | |
| CN201123072Y (en) | Mobile multimedia broadcast data processing system | |
| US20150063490A1 (en) | Transmitting apparatus and receiving apparatus and signal processing method thereof | |
| WO2011082834A1 (en) | Error correction | |
| CN101326727A (en) | Device providing selective error correction data reception | |
| CN201349326Y (en) | Audio storage system and mobile terminal | |
| US8427960B2 (en) | Method and device for analyzing data | |
| CN201167388Y (en) | System for processing mobile broadcast data | |
| KR102163746B1 (en) | Transmitting apparatus and receiving apparatus and signal processing method thereof | |
| CN101359974A (en) | High-efficient source adaptation method suitable for LDPC block coding in T-MMB system | |
| CN102170583A (en) | Method and system for recovering and playing audio frequency in mobile multimedia broadcast |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081001 |