CN1925384A - Device and method for detecting transmission error of digital broadcast information flow - Google Patents
Device and method for detecting transmission error of digital broadcast information flow Download PDFInfo
- Publication number
- CN1925384A CN1925384A CN 200510029363 CN200510029363A CN1925384A CN 1925384 A CN1925384 A CN 1925384A CN 200510029363 CN200510029363 CN 200510029363 CN 200510029363 A CN200510029363 A CN 200510029363A CN 1925384 A CN1925384 A CN 1925384A
- Authority
- CN
- China
- Prior art keywords
- sync byte
- bit
- digital broadcast
- information flow
- broadcast information
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims description 17
- 238000000034 method Methods 0.000 title description 9
- 238000000605 extraction Methods 0.000 claims abstract description 4
- 239000000284 extract Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 abstract description 4
- 230000001788 irregular Effects 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 239000000470 constituent Substances 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001915 proofreading effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
Landscapes
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
This invention relates to digital broadcasting information flow error test device, which mainly uses MPEG-2 to send information when there is large volume of error and to accurately test bit error rate. This invention comprises the following three parts: one synchronous bit extraction part to extract digital broadcasting information flow for testing digital flow error; synchronous bit memory part to extract bit; comparing device to store synchronous bit and irregular codes to test error bit.
Description
[technical field]
The invention relates to the invention of digital broadcast information flow error detection aspect.The present invention mainly is when utilizing the broadcast communication of MPEG-2 flow of transmitted information generation wrong in a large number, accurately measures the method for bit error rate (hereinafter to be referred as BER).
[background technology]
Recently, it is very fast that digital broadcasting is popularized, and these digital broadcastings have utilized MPEG-2 flow of transmitted information technology.
In general, the quality during for the broadcast communication of detection MPEG-2 flow of transmitted information is measured bit error rate at decoder one end.
Measuring the art methods of BER represents with Fig. 1.
Fig. 1 (a) is illustrated in the component drawings of common fault correction coding device in the encoder that is applicable to digital broadcast transmitter.(b) is illustrated in the component drawings of common fault correction decoder device in the encoder that is applicable to digital broadcast transmitter among Fig. 1.
The encoder 1 of digital broadcast transmitter comprises RS encoder 11, byte-interleaving 12, revolves long-pending encoder 13, Bit Interleave 14.
Decoder is for proofreading and correct the mistake that the MPEG-2 flow of transmitted information transmits, carrying out apparatus for encoding.In the RS encoder,, carry out RS coding 11 with the unit assembly for carrying out error correction.
Byte-interleaving 12 be numeral with RS coding by certain rule, the work so that the byte unit order change is arranged promptly disperses the connection error that may occur in the numeral.
With the numeral of unit byte-interleaving, by revolving long-pending encoder 13 codings, the numeral behind the coding is again by Bit Interleave 14, and is staggered with bit base.
The MPEG-2 flow of transmitted information of coding transmission is in this way decoded in the decoder in Fig. 2 (b).
That is, as shown in Fig. 2 (b), by bit reversal interleaver 21, through bit ratio decoder device 22, delayer 23, revolve in the decoder 2 that long-pending encoder 24, byte-interleaving 25, RS decoder 26 constitute, the MPEG-2 flow of transmitted information behind the coding is decoded.
The formation of the formation of the intraware of decoder 2 and encoder 1 intraware just in time is reversed arrangement.
Therefore, in above-mentioned bit reversal interleaver 21, make staggered numeral contrary staggered with bit base, the order of restored data.Decode in the data input bit ratio decoder device 22 after the recovery.
Above-mentioned bit ratio decoder device 22 has used representational bit to decode than algorithm for to decode to revolving the product sign indicating number.
Form contraryly staggered in the reverse interleaved device 25 of byte with byte unit with the data behind the bit ratio decoder, 26 decode to coded data by the RS decoder in the RS encoder.
For being determined at the mistake that may occur in the transport process, the data of being revolved once more behind the bit ratio decoder before long-pending coded data and the bit ratio decoder are compared.
That is, after the data before the bit ratio decoder are delayed device and postpone a period of time, revolved long-pending coded data once more and compared again with behind the bit ratio decoder, mistake when transmitting, whether occurred to check data.
But, because this method just merely compares the data before and after the bit ratio decoder, measure BER, so when appearance was wrong in a large number, the confidence level of its measured value will reduce.
[summary of the invention]
The present invention researches and develops for the solution problems of the prior art just.The present invention has when using the MPEG-2 flow of transmitted information to carry out broadcast communication, even a large amount of mistakes occur, the confidence level of BER measured value still can very high advantage.
To achieve these goals, the digital broadcast transmission error detector element among the present invention is made of three parts: the one, transmit mistake for measuring digital broadcast information flow, and the sync byte that extracts above-mentioned digital broadcast information flow sync byte extracts part; The 2nd, the sync byte storage area of the sync byte that storage is extracted; The 3rd, the sync byte of storage and the random number of having set storage relatively, the comparator of detection error bit.
Above-mentioned switch is feature to use the exclusiveness logic.
The feature of random number is to be made of the bit identical with sync byte.
Digital broadcast transmission error-detecting method among the present invention among the present invention comprises four steps: the one, and the step of extraction sync byte in transmitting digital broadcast information flow; The 2nd, the step of the sync byte that storage is extracted; The 3rd, the sync byte of storage and the random number of having set storage relatively, the step of detection error bit.The 4th, random number is to be made of the bit identical with above-mentioned sync byte.
As mentioned above, transmission error of digital broadcast information flow checkout gear of the present invention and method have following effect,
When the first, utilizing the MPEG-2 flow of transmitted information to carry out broadcast communication, even a plurality of mistakes occur, the confidence level of BER measured value is still very high.
The second, be applicable in MPEG-1 information flow and the MPEG-2 flow of transmitted information, and can accurately detect the quality of information flow.
[description of drawings]
Fig. 1 is the inside constituent components figure for the encoder of measuring BER of prior art.
Fig. 2 for the present invention the inside constituent components figure for the decoder of measuring BER.
Fig. 3 is the pie graph of MPEG-2 flow of transmitted information of the present invention.
[embodiment]
Below with reference to accompanying drawings formation of the present invention and effect are elaborated by embodiment.
Fig. 2 for the present invention the inside constituent components figure for the decoder of measuring BER.
As shown in Figure 2, BER of the present invention measures and comprises three parts: the one, and for measuring the decoder 100 of BER, the sync byte that extracts sync byte in the MPEG-2 flow of transmitted information extracts part 110; The 2nd, the stores synchronized part 120 of the sync byte that storage is extracted; The 3rd, the memory 130 and the exclusiveness logical one 40 of the random signal of storage.
In the present invention with above-mentioned formation, if detail knowledge is described as follows for the operation principle of the decoder 100 of mensuration BER,
Be input to the sync byte extraction part 110 of decoder 100 with the MPEG-2 flow of transmitted information of a plurality of MPEG-2 transmission block transfers.
Sync byte extracts part 110 and only extract the sync byte part in the MPEG-2 of above-mentioned continuous transmission flow of transmitted information.
Be more detailed description, please refer to the pie graph of MPEG-2 flow of transmitted information shown in Figure 3.
As shown in Figure 3, MPEG-2 transmission block length has the regular length of 188 bytes, partly is made of the fixed-header part and the real data of first half 4 bytes.
Title division comprises the sync byte part of being represented by 8 bits.Title division comprises that also transmission error indicator, loading unit begin indicating device, transmit priority, transmit control, scope of application control, continuous counter and seven parts of the scope of application.
First sync byte of title division for being different from the transmission information sets, has fixed numeric values (01000111) transmitting in the flow of transmitted information continuously.{ in cycle other parts repeatedly, not using this numerical value (for example PID) }
Being characterized as of MPEG-2 transmission information sets among the present invention utilizes the fixed numbers with sync byte to measure BER.
In sync byte extracts part 110, only be extracted in 8 bits that comprise in continuous n the flow of transmitted information title with the byte part.
The n that extracts sync byte be stored in the sync byte storage area.
For finding out mistake, itself and n the sync byte of being stored are compared.In addition, with random signal storage in memory.
Random signal is to be made of the bit identical with the said fixing sync byte.For example, 01000111 bit constitutes the n byte.
If the sync byte of the n byte of being stored and the random number of said n byte carry out exclusiveness identification by the exclusiveness logical path, output is that 1 byte number then is the erroneous words joint number.
The exclusiveness logic identification is, because under 2 bits of input situation inequality, be output as 1, if so in transmitting sync byte, mistake occurs, it is different to set the random signal of wanting with having the same bits formation in advance, the 1st, the bit number that export, therefore being output as 1 bit number is exactly the error bit number.
Therefore, the present invention utilizes the byte with fixed bit sequence, measures the mistake that it may occur in transport process, so even a plurality of mistakes occur, also can determine at an easy rate.
Also have, and if the BER analyzer under the prior art condition use together, can improve the confidence level of BER measured value.
On the one hand, the present invention also is applicable to sync byte is used for fixing the MPEG-1 of bit sequence and the program information stream of MPEG-2.
Digital broadcasting is by above-mentioned description, and the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.Therefore, the technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to interest field.
Claims (5)
1, transmission error of digital broadcast information flow checkout gear comprises:
Transmit mistake for measuring digital broadcast information flow, the sync byte that extracts above-mentioned digital broadcast information flow sync byte extracts part;
The sync byte storage area of the sync byte that storage is extracted;
The sync byte of storage and the random number of having set storage relatively, the comparator of detection error bit.
2, as claim item 1 described transmission error of digital broadcast information flow checkout gear, it is characterized in that,
Described comparator uses the exclusiveness logic sum gate.
3, as claim item 1 described transmission error of digital broadcast information flow checkout gear, it is characterized in that,
The random number of digital broadcasting is to be made of the bit identical with sync byte.
4, transmission error of digital broadcast information flow detection method comprises four steps:
The one, the step of extraction sync byte in transmitting digital broadcast information flow;
The 2nd, the step of the sync byte that storage is extracted;
The 3rd, the sync byte of storage and the random number of having set storage relatively, the step of detection error bit;
The 4th, random number is to be made of the bit identical with above-mentioned sync byte.
5, as claim item 4 described transmission error of digital broadcast information flow detection methods, it is characterized in that,
Described random number is to be made of the bit identical with sync byte.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510029363 CN1925384A (en) | 2005-09-02 | 2005-09-02 | Device and method for detecting transmission error of digital broadcast information flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510029363 CN1925384A (en) | 2005-09-02 | 2005-09-02 | Device and method for detecting transmission error of digital broadcast information flow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1925384A true CN1925384A (en) | 2007-03-07 |
Family
ID=37817878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510029363 Pending CN1925384A (en) | 2005-09-02 | 2005-09-02 | Device and method for detecting transmission error of digital broadcast information flow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1925384A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111989580A (en) * | 2019-01-22 | 2020-11-24 | 爱德万测试公司 | Automated test equipment for testing one or more devices under test, method for automated testing of one or more devices under test and computer program for handling command errors |
-
2005
- 2005-09-02 CN CN 200510029363 patent/CN1925384A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111989580A (en) * | 2019-01-22 | 2020-11-24 | 爱德万测试公司 | Automated test equipment for testing one or more devices under test, method for automated testing of one or more devices under test and computer program for handling command errors |
| CN111989580B (en) * | 2019-01-22 | 2023-06-30 | 爱德万测试公司 | Automated test equipment for testing one or more devices under test, method for automated testing of one or more devices under test and computer program for handling command errors |
| US11913990B2 (en) | 2019-01-22 | 2024-02-27 | Advantest Corporation | Automated test equipment for testing one or more devices under test, method for automated testing of one or more devices under test, and computer program for handling command errors |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1138346C (en) | Iterative Decoder and Iterative Decoding Method in Communication System | |
| CN1154237C (en) | Encoding/decoding device and encoding/decoding method | |
| TW583842B (en) | Coding of data stream | |
| US8462702B2 (en) | Method and apparatus for synchronizing highly compressed enhancement layer data | |
| CA2741391C (en) | Methods and apparatus to extract data encoded in media content | |
| CN1065096C (en) | Method and apparatus for detecting bit rate in variable bit rate communication | |
| CN101030836A (en) | Method and apparatus for data encoding and communication over noisy media | |
| CN1317176A (en) | Data rate detection device and method for mobile communication system | |
| CN1533635A (en) | Signal coding | |
| CN101803290A (en) | Method and apparatus for preserving deinterleaving erasure information of block interleaved coded signal | |
| EP2149138A1 (en) | Method and apparatus for processing encoded audio data | |
| CN1324897C (en) | Error detecting method and apparatus | |
| CN115208512B (en) | Telemetering data frame coding and decoding mode | |
| CN1249966C (en) | Method and apparatus for determining data rate transmitted by variable rate | |
| CN1925384A (en) | Device and method for detecting transmission error of digital broadcast information flow | |
| KR101367209B1 (en) | Digital broadcast receiver and method thereof | |
| CN1093844A (en) | Be used for detecting the synchronous Method and circuits of viterbi decoder | |
| CN101056414A (en) | A joint coding method for video data stream source and channel | |
| CN1422006A (en) | Receiving circuit for receiving information signal | |
| CN109428674A (en) | Data transmission method, device and system, transmitting terminal, receiving end and storage medium | |
| CN101656594B (en) | Method and equipment for branch path synchronization of deletion type convolution code | |
| CN1543736A (en) | Device and method for checking quality of data packets transmitted via wireless channel | |
| WO2023005313A1 (en) | Link monitoring method and device | |
| CN1901430A (en) | System and method for blind transport format detection with cyclic redundancy check | |
| EP2002547B1 (en) | Method for encoded or encrypted bit stream synchronization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |