CN104639919A

CN104639919A - Data transmission method and data transmission system for digital video optical transceiver system

Info

Publication number: CN104639919A
Application number: CN201310568067.0A
Authority: CN
Inventors: 文雯; 王航; 徐宁
Original assignee: Hangzhou Hikvision Digital Technology Co Ltd
Current assignee: Hangzhou Hikvision Digital Technology Co Ltd
Priority date: 2013-11-14
Filing date: 2013-11-14
Publication date: 2015-05-20
Anticipated expiration: 2033-11-14
Also published as: CN104639919B

Abstract

The invention relates to the field of photoelectric communication, and discloses a data transmission method and a data transmission system for a digital video optical transceiver system. According to the data transmission method and the data transmission system, coding redundancy is adjusted according to the error rate, whether or not a forward error correction coding mode is needed and which forward error correction decoding mode of the coding redundancy is adopted are determined dynamically, and accordingly, forward error correction coding/decoding technology based adaptive error detection and correction are achieved. The data transmission method includes receiving video data and information representing the coding redundancy of the video data through an optical fiber; selecting the corresponding forward error correction decoding mode to decode the video data according to the information representing the coding redundancy; calculating the error rate of the decoded video data; adjusting the coding redundancy according to the error rate; according to the adjusted coding redundancy, selecting the corresponding forward error correction coding mode to code the to-be-sent video data; sending the video data and the information representing the coding redundancy through the optical fiber.

Description

For data transmission method and the system thereof of digital video fiber optic transmitter system

Technical field

The present invention relates to photoelectric communication field, particularly a kind of communication technology of digital video fiber optic transmitter system.

Background technology

In existing video optical transceiver system capable, along with the demand of fiber-optic communications traffic capacity and distance constantly increases, the dispersion of optical fiber, the signal attenuation that long distance causes, interchannel noise, and the interference in an optical fiber between multiple wavelength becomes the key constraints of the fiber optic applications of the long distance of two-forty; Simultaneously all non-compress stream owing to transmitting in existing digital video fiber optic transmitter system; sometimes in order to judge transmission correctness; can replenishment cycles verification mode verify; but cyclic check mode can only error detection; do not have error correcting capability, the error code that such Optical Fiber Transmission produces usually can cause that image has bright spot to glimmer, synchronously unstable; shake up and down, serious even can the blank screen problem that cannot show.

Forward error correction (Forward Error Correction, being called for short " FEC ") technology is generally used in large-scale optical network system in optical communications, as jumbo high density Wave division multiplexing (Dense WaveLength Division Multiplexing, be called for short " DWDM ") in system, and forward error correction technique is applied in video optical multiplexer there is no similar case at present.

Summary of the invention

The object of the present invention is to provide a kind of data transmission method for digital video fiber optic transmitter system and system thereof, according to error rate adjustment coding redundancy degree, dynamically determine whether to need to take forward error correction coding mode, and take the decoding FEC mode of which kind of coding redundancy degree, thus realize the self adaptation error detection of forward error correction coding/decoding technology and error correction, improve the reliability of transfer of data, increase coding gain, extend transmission distance, be specially adapted to highway, field, the disaster relief, and severe engineering-environment uses.

For solving the problems of the technologies described above, embodiments of the present invention disclose a kind of data transmission method for digital video fiber optic transmitter system, this digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, and this data transmission method being used for digital video fiber optic transmitter system comprises the following steps:

Video optical multiplexer receiving terminal is by optical fiber receiving video data and the information representing this video data encoding redundancy;

Video optical multiplexer receiving terminal, according to the information representing coding redundancy degree, selects corresponding decoding FEC mode to video data decoding;

Video optical multiplexer receiving terminal calculates the error rate of the video data through decoding;

According to the error rate, adjustment coding redundancy degree;

Video optical multiplexer transmitting terminal, according to the coding redundancy degree through adjustment, selects corresponding forward error correction coding mode to sent video data encoding;

Video optical multiplexer transmitting terminal sends encoded video data by optical fiber and represents the information of this video data encoding redundancy.

Embodiments of the present invention also disclose a kind of data transmission method for uplink for digital video fiber optic transmitter system, this digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, and this data transmission method for uplink being used for digital video fiber optic transmitter system comprises the following steps:

Video optical multiplexer transmitting terminal is according to coding redundancy degree, select corresponding forward error correction coding mode to sent video data encoding, this coding redundancy degree obtains according to error rate adjustment, and this error rate is the error rate of the video data of being decoded by decoding FEC mode by video optical multiplexer receiving terminal;

Video optical multiplexer transmitting terminal sends encoded video data by optical fiber and represents the information of this video data encoding redundancy, receives for video optical multiplexer receiving terminal.

Embodiments of the present invention also disclose a kind of data receive method for digital video fiber optic transmitter system, this digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, and this data receive method being used for digital video fiber optic transmitter system comprises the following steps:

Video optical multiplexer receiving terminal, according to coding redundancy degree information, selects corresponding decoding FEC mode to video data decoding;

Video optical multiplexer receiving terminal calculates the error rate of the video data through decoding, and when spending for adjustment coding redundancy, this coding redundancy degree is used for video optical multiplexer transmitting terminal to sent the corresponding forward error correction coding mode of video data encoding process choosing.

Embodiments of the present invention also disclose a kind of data transmission system for digital video fiber optic transmitter system, this digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, video optical multiplexer receiving terminal comprises receiving element, decoding unit and computing unit, and video optical multiplexer transmitting terminal comprises coding unit and transmitting element;

This data transmission system being used for digital video fiber optic transmitter system comprises:

Receiving element, for by optical fiber receiving video data and the information representing this video data encoding redundancy;

Decoding unit, for according to the information representing coding redundancy degree, selects corresponding decoding FEC mode to the video data decoding received by receiving element;

Computing unit, for calculating the error rate of the video data through decoding unit decodes;

Adjustment unit, for the error rate calculated according to computing unit, adjustment coding redundancy degree;

Coding unit, for according to the coding redundancy degree adjusted through adjustment unit, selects corresponding forward error correction coding mode to sent video data encoding;

Transmitting element, for sent by optical fiber through encoded cell encoding video data and represent the information of this video data encoding redundancy.

Embodiments of the present invention also disclose a kind of digital video fiber optic transmitter, and digital video fiber optic transmitter comprises coding unit and transmitting element, wherein,

Coding unit, for according to coding redundancy degree, select corresponding forward error correction coding mode to sent video data encoding, this coding redundancy degree obtains according to error rate adjustment, and this error rate is the error rate of the video data of decoding through decoding FEC mode;

Transmitting element, sends the video data of encoded cell encoding by optical fiber and represents the information of this video data encoding redundancy, receiving for receiving element.

Embodiments of the present invention also disclose a kind of digital video fiber optic transmitter, and digital video fiber optic transmitter comprises receiving element, decoding unit and computing unit, wherein,

Computing unit, for calculating the error rate of the video data through decoding unit decodes, when spending for adjustment coding redundancy, this coding redundancy degree is used for sent the corresponding forward error correction coding mode of video data encoding process choosing.

Compared with prior art, the main distinction and effect thereof are embodiment of the present invention:

According to error rate adjustment coding redundancy degree, dynamically determine whether to need to take forward error correction coding mode, and take the decoding FEC mode of which kind of coding redundancy degree, thus realize the self adaptation error detection of forward error correction coding/decoding technology and error correction, improve the reliability of transfer of data, increase coding gain, extend transmission distance, be specially adapted to highway, field, the disaster relief, and severe engineering-environment uses.

Further, judged by error rate thresholding, the corresponding error rate of adjustment up and down rank, and according to this rank correspondence adjustment coding redundancy degree, thus dynamically determine whether to need to take forward error correction coding mode, and take the decoding FEC mode of which kind of coding redundancy degree, thus realize the self adaptation error detection of forward error correction coding/decoding technology and error correction.

Further, to receive coding redundancy degree be zero video data directly decode, can resource consumption be reduced, improve decoding speed.

Further, by abandoning the insensitive partial data of part human eye, adjustment data format carries out lossy compression method transmission, is meeting in the hostile transmission environment situations such as longer transmission distance, can ensure the visual effect of video data or the auditory effect of voice data.

Further, in employing, institute's code carries out encoding and decoding, and to the random error and burst error error correction that the video data through transmission produces, and error correction effect is good.

Further, judged by error rate thresholding, the corresponding error rate of adjustment up and down rank, and according to this rank correspondence adjustment coding redundancy degree, thus dynamically determine whether to need to take forward error correction coding mode, thus realize the self adaptation error detection of forward error correction coding/decoding technology and error correction.

Further, for the error rate less or be zero time, do not take forward error correction coding mode and direct coding, resource consumption can be reduced, improve coding rate.

Further, by common parallel iBM algorithm serial decompositionization is calculated, when not affecting continuous decoding, greatly reducing the hardware resource solved needed for key equation, reducing path delay simultaneously.In addition, optimizing money search and Forney algorithmic procedure by merging, splitting by time item of the odd even in error location polynomial and improper value multinomial, decreasing control logic and double counting.Therefore, hardware resource consumption of the present invention is only 1/2 ~ 1/3 of common iBM algorithm realization, and maximum clock frequency and valid data bandwidth improve about 30%, IA High Speed Channel error correcting technique can be made to be applied on low density chip, reduce cost.

Accompanying drawing explanation

Fig. 1 is the schematic flow sheet of a kind of data transmission method for digital video fiber optic transmitter system in first embodiment of the invention;

Fig. 2 is the schematic flow sheet of a kind of data transmission method for digital video fiber optic transmitter system in second embodiment of the invention;

Fig. 3 is the schematic flow sheet of a kind of data transmission method for digital video fiber optic transmitter system in second embodiment of the invention;

Fig. 4 is the schematic flow sheet of a kind of data transmission method for uplink for digital video fiber optic transmitter system in third embodiment of the invention;

Fig. 5 is the schematic flow sheet of a kind of data transmission method for uplink for digital video fiber optic transmitter system in four embodiment of the invention;

Fig. 6 is the schematic flow sheet of a kind of data receive method for digital video fiber optic transmitter system in fifth embodiment of the invention;

Fig. 7 is the structural representation of a kind of data transmission system for digital video fiber optic transmitter system in seventh embodiment of the invention;

Fig. 8 is the structural representation of a kind of data transmission system for digital video fiber optic transmitter system in eighth embodiment of the invention;

Fig. 9 is the structural representation of a kind of data transmission system for digital video fiber optic transmitter system in eighth embodiment of the invention;

Figure 10 is the structural representation of a kind of data transmission system for digital video fiber optic transmitter system in eighth embodiment of the invention;

Figure 11 is the structural representation of a kind of data transmission system for digital video fiber optic transmitter system in eighth embodiment of the invention;

Figure 12 is the structural representation of a kind of digital video fiber optic transmitter in ninth embodiment of the invention;

Figure 13 is the structural representation of a kind of digital video fiber optic transmitter in tenth embodiment of the invention;

Figure 14 is the structural representation of a kind of digital video fiber optic transmitter in eleventh embodiment of the invention;

Figure 15 is the structural representation of a kind of digital video fiber optic transmitter in twelveth embodiment of the invention.

Embodiment

In the following description, many ins and outs are proposed in order to make reader understand the application better.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations of following execution mode and amendment, also can realize each claim of the application technical scheme required for protection.

For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiments of the present invention are described in further detail.

First embodiment of the invention relates to a kind of data transmission method for digital video fiber optic transmitter system.Fig. 1 is this schematic flow sheet for the data transmission method of digital video fiber optic transmitter system.Digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, video optical multiplexer receiving terminal and video optical multiplexer transmitting terminal physically independent separate are arranged, that is, when the present invention specifically disposes and runs, choose one as receiving terminal or the transmitting terminal of a video optical multiplexer use.

In some other execution modes of the present invention, when video data signal transmits, a video optical multiplexer can use as receiving terminal and transmitting terminal simultaneously.

As shown in Figure 1, this data transmission method being used for digital video fiber optic transmitter system comprises the following steps:

In a step 101, video optical multiplexer receiving terminal is by optical fiber receiving video data and the information representing this video data encoding redundancy.After this enter step 102, video optical multiplexer receiving terminal, according to the information representing coding redundancy degree, selects corresponding decoding FEC mode to video data decoding, and this video data is video data received in step 101.

After this enter step 103, video optical multiplexer receiving terminal calculates the error rate of the video data through decoding.

After this step 104 is entered, according to the error rate calculated, adjustment coding redundancy degree.

After this enter step 105, video optical multiplexer transmitting terminal, according to the coding redundancy degree through adjustment, selects corresponding forward error correction coding mode to sent video data encoding.

After this enter step 106, video optical multiplexer transmitting terminal sends encoded video data by optical fiber and represents the information of this video data encoding redundancy.

After this process ends.

According to error rate adjustment coding redundancy degree, dynamically determine whether to need to take forward error correction coding mode, and take the decoding FEC mode of which kind of coding redundancy degree, thus realize the self adaptation error detection of forward error correction coding/decoding technology and error correction.

Video can have corresponding audio frequency, i.e. sound video, also can not have audio frequency, i.e. silent video.

Video optical multiplexer receiving terminal is the optical transmitter and receiver with video data receiving function and/or signal feedback function.Video optical multiplexer transmitting terminal is have the optical transmitter and receiver that video data sends function and/or signal feedback function.

In the error rate that above-mentioned basis calculates, adjustment coding redundancy degree step 104, can video optical multiplexer receive side be finished after and by coding redundancy degree adjustment result feedback send side to video optical multiplexer, to select corresponding forward error correction coding mode to sent video data encoding.Or also can receive side by video optical multiplexer and perform calculating after the step 103 of the error rate of the data of decoding, and the result of calculation this being represented the error rate feeds back to video optical multiplexer sends side and be used for performing the error rate according to calculating, the step 104 of adjustment coding redundancy degree.

Represent the information of video data encoding redundancy, comprise following any one or multiple combination in any: the different coding/decoding mode that the class information of coding redundancy degree information, coding redundancy degree, representative have the different coding mode information of different coding redundancy, representative has different coding redundancy and class information thereof, the error rate, the information etc. that represents the error rate have about information required during data channel transmission and in coding/decoding process.

When decoding to the video data received, by representing the information of video data encoding redundancy, corresponding decoding FEC mode can be selected, as corresponding forward error correction decoding algorithm/program.

The error rate (Bit Error Ratio, be called for short " BER ") weighs the index of data transfer of data accuracy at the appointed time.The error rate=(error code in transmission/transmit gross yards) ^*100%, if so have error code just to have the error rate.In addition, also have the frequency error rate being defined as and occurring for weighing error code, IEEE802.3 standard is the acceptable maximum error rate of 1000Base-T network formulates is 10E-10.This error rate standard sets, the namely coded system of gigabit Ethernet for pulse-amplitude modulation 5 (Pulse Amplitude Modulation5 is called for short " PAM-5 ") coding.The generation of error code is due in Signal transmissions, and decay changes the voltage of signal, causes signal to be destroyed in the transmission, produces error code.The pulse that noise, alternating current or lightning cause, transmission equipment fault and other factors also all can cause error code, and (signal such as transmitted is 1, and what receive is 0.Vice versa).The equipment of various different size, all have strict error rate definition, the error rate as usual video bi-directional light terminal should in " BER≤10E-9 " scope.

The method calculating the error rate has two large classes: the combination of statistical method, actual measurement method and these two kinds of methods.

Statistical method: some measuring technique is based on the statistical analysis of predicted error quantity, and the statistical analysis of this use common statistical apportion design can reach certain accuracy.Actual measurement method: actual measurement technology can use cyclic redundancy check (CRC) (Cyclic Redundancy Check, be called for short " CRC ") determine a period of time interior error condition occurred, any modern LAN hardware and network analysis software can carry out this actual physics measurement.

Forward error correction technique is a kind of error control method, it refers to that signal first carried out coded treatment according to certain algorithm in advance before being admitted to transmission channel, add the superfluous code with the feature of signal own, decode according to corresponding algorithm at video optical multiplexer receiving terminal, after the decoding of video optical multiplexer receiving terminal, not only can find mistake, and can the position at misjudgment code element place, and automatic error-correcting.This error correction code information does not need to store, and do not need feedback, real-time is good.So unidirectional transmission system often adopts this channel coding method at present.

Second embodiment of the invention relates to a kind of data transmission method for digital video fiber optic transmitter system.Fig. 2 and Fig. 3 is this schematic flow sheet for the data transmission method of digital video fiber optic transmitter system.

Second execution mode improves on the basis of the first execution mode, main improvements are: judged by error rate thresholding, the corresponding error rate of adjustment up and down rank, and according to this rank correspondence adjustment coding redundancy degree, thus dynamically determine whether to need to take forward error correction coding mode, and take the decoding FEC mode of which kind of coding redundancy degree, thus realize the self adaptation error detection of forward error correction coding/decoding technology and error correction.To receive coding redundancy degree be zero video data directly decode, can resource consumption be reduced, improve decoding speed.By abandoning the insensitive partial data of part human eye, adjustment data format carries out lossy compression method transmission, is meeting in the hostile transmission environment situations such as longer transmission distance, can ensure the visual effect of video data or the auditory effect of voice data.In employing, institute's code carries out encoding and decoding, and to the random error and burst error error correction that the video data through transmission produces, and error correction effect is good.Specifically:

According to the error rate, the step of adjustment coding redundancy degree, comprises following sub-step:

Judge whether the error rate is greater than the thresholding pre-set.

If so, the rank of the error rate is then adjusted upward.

If not, then the rank of the error rate is adjusted downwards.

According to the rank of the error rate through adjustment, corresponding adjustment coding redundancy degree.

As a preferred embodiment of the present invention, arrange the rank of the error rate according to thresholding correspondence, if belong to minimum rank through the rank of the error rate of adjustment, then coding redundancy degree can be zero.

In some other execution modes of the present invention, according to the error rate, the step of adjustment coding redundancy degree, can also be realized by adjustment threshold range, such as, this adjustment process comprises the following steps:

Judge whether the error rate is greater than the first thresholding pre-set.

If so, then judge whether the error rate is less than or equal to the second thresholding pre-set, this second thresholding is greater than the first thresholding.

If so, then corresponding selection coding redundancy degree, this coding redundancy degree and first threshold scope one_to_one corresponding, this first threshold scope is formed by the first thresholding and the second thresholding.

According to the error rate, after the step of adjustment coding redundancy degree, further comprising the steps of:

Judge whether coding redundancy degree is zero.

If so, then video optical multiplexer transmitting terminal to sent video data direct coding.

Video optical multiplexer transmitting terminal sends the video data of this direct coding by optical fiber and represents the information of coding redundancy degree of video data of this direct coding.

Video optical multiplexer receiving terminal by optical fiber receiving video data and represent this video data encoding redundancy the step of information after, further comprising the steps of:

Judge whether coding redundancy degree is zero.

If so, then video data is directly decoded, directly decode the method referring to and do not use decoding FEC mode to directly decode.

If judge, coding redundancy degree is non-vanishing, then to received video data according to the information representing this coding redundancy degree, select corresponding decoding FEC mode to decode.

As a preferred embodiment of the present invention, as shown in Figure 2, this data transmission method being used for digital video fiber optic transmitter system is further comprising the steps of:

In step 201, video optical multiplexer receiving terminal receiving video data and represent the information of this video according to coding redundancy degree.

After this enter step 202, video optical multiplexer receiving terminal judges whether coding redundancy degree is zero.

If so, then enter step 203, otherwise enter step 204.

In step 203, if coding redundancy degree is zero, video optical multiplexer receiving terminal directly decodes the video data received, and after this enters step 205.

In step 204, if coding redundancy degree is non-vanishing, video optical multiplexer receiving terminal selects corresponding decoding FEC mode to video data decoding, after this enters step 205.

In step 205, video optical multiplexer receiving terminal calculates the error rate of the video data through decoding.

After this enter step 206, judge whether the error rate is as calculated greater than the thresholding pre-set.

If so, then enter step 207, otherwise enter step 208.

In step 207, if the error rate is judged as the thresholding being greater than and pre-setting, then adjusts upward the rank of the error rate, after this enter step 209.

In a step 208, if the error rate is judged as the thresholding being not more than and pre-setting, then adjusts the rank of the error rate downwards, after this enter step 209.

In step 209, according to the rank of the error rate through adjustment, corresponding adjustment coding redundancy degree;

After this enter step 210, judge whether the coding redundancy degree through adjustment is zero.

If so, then enter step 211, otherwise enter step 212.

In step 211, if coding redundancy degree is zero, video optical multiplexer transmitting terminal then to sent video data direct coding, after this enters step 213.

In the step 212, if coding redundancy degree is non-vanishing, video optical multiplexer transmitting terminal, then according to coding redundancy degree, is selected forward error correction coding mode to sent video data encoding, is after this entered step 213.

In step 213, video optical multiplexer transmitting terminal sends video data by optical fiber and represents the information of coding redundancy degree.

Video optical multiplexer transmitting terminal, according to the coding redundancy degree through adjustment, is selected corresponding forward error correction coding mode to sent the step of video data encoding, is comprised following sub-step:

Video optical multiplexer transmitting terminal judges whether the error rate is greater than the first threshold pre-set, and this first threshold is greater than the thresholding used of the judgement before rank adjusting.

If so, then video optical multiplexer transmitting terminal is to sent video data lossy compression method, and this lossy compression method process comprises and abandons the insensitive partial data of the mankind, and adjusts the step of video data format.

Video optical multiplexer transmitting terminal, according to the coding redundancy degree through adjustment, selects corresponding forward error correction coding mode to the video data encoding through lossy compression method.

Whether video optical multiplexer transmitting terminal carries out the basis for estimation of lossy compression method to sent video data, also can be the classification situation of the error rate, that is: if the rank of the error rate equals the rank at transmission standard acceptable maximum bit error rate place, then lossy compression method is carried out.

Lossy compression method make use of the mankind to the insensitive characteristic of some frequency content in some component of image or sound wave, allows to lose certain information in compression process.Be described for image, although can not recover initial data completely, the part of losing reduces the impact understanding original image, has but brought much bigger compression ratio.Lossy compression method is widely used in the compression of voice, image and video data.In multimedia application, common compression method has: pulse code modulation lossy compression method, predictive coding, transition coding, interpolation and extrapolation, statistical coding, vector quantization and sub-band coding etc., and hybrid coding is the method extensively adopted in recent years.

In the process of carrying out lossy compression method, to sent video data, according to embody rule needs, the corresponding appropriate section abandoned in video data to be sent, such as, when only needing monochrome information, can abandon whole chromatic component.When more depending on chrominance information.Also some or all of luminance component can correspondingly be abandoned.

To the voice data in video data to be sent, also the psychoacoustic characteristics (masking spectrum characteristic and temporal masking characteristic etc.) of human auditory system and people's ear can be utilized the finite resolving power of signal amplitude, frequency, time, during coding, the imperceptible frequency of every people's ear all or part ofly can not encoded, is not transmitted, and namely everyly distinguishes that the intensity of voice signal, tone, orientation do not have contributive all or part of (being called uncorrelated part or irrelevant portions) do not encode and transmit to people's ear.When imperceptible part is encoded, allow larger quantizing distortion and make it be in the threshold of audibility (i.e. people's ear can hear minimum volume) below, people's ear is still imperceptible.

Under channel redundancy all takies and still cannot meet extreme condition, video data is suitably compressed, sacrifice vision bandwidth and ensure that video optical multiplexer receiving terminal has image to show all the time as possible.

Represent the information of video data encoding redundancy, also can comprise and whether compressing and the information of compressed format, when video optical multiplexer receiving terminal receives compressed video data, according to this information to the corresponding decompress(ion) of video data.

Institute's code in forward error correction coding mode and decoding FEC mode adopt.

In institute's code (Reed-solomon codes, be called for short " RS "), be a kind of chnnel coding of forward error correction of low rate, to effective by correcting the multinomial that over-sampling data produce.First cataloged procedure asks redundancy to these multinomials on multiple point, is then transmitted or stores.Multinomial overdetermination (cross and limit) is made to the polynomial this sampling exceeding essential value.When receiving terminal correct receive enough points after, it just can recover original multinomial, even if the multinomial received has a lot of point by noise jamming distortion.

In the error correcting capability of institute's code be t code element, as shown in Figure 3, this data transmission method being used for digital video fiber optic transmitter system is further comprising the steps of:

In step 301, video optical multiplexer receiving terminal calculates 2t syndrome S to the video data through RS coding received _ito form associated polynomial S (x), wherein i=0 ~ 2t-1;

After this enter step 302, video optical multiplexer receiving terminal uses iBM algorithm, solves key equation S (x) σ (x)=ω (x) mod x by above-mentioned associated polynomial S (x) ^2t, to obtain error location polynomial σ (x)=σ ₀+ σ ₁x+ ... + σ _t-1x ^t-1+ σ _tx ^twith improper value multinomial ω (x)=ω ₀+ ω ₁x+ ... + ω _t-1x ^t-1, wherein mod represents remainder, in i-th iteration of mistake in computation position multinomial σ (x), sequentially calculates intermediate variable σ respectively in t+1 cycle ⁽ⁱ⁾t+1 factor sigma ₀ ⁽ⁱ⁾, σ ₁ ⁽ⁱ⁾σ _t ⁽ⁱ⁾, each computation of Period coefficient;

Specifically, in the jth cycle in i-th iteration of mistake in computation value multinomial ω (x), wherein j=0 ~ t-1, as j=0, by factor sigma ₀calculate ω ⁽ⁱ⁾coefficient ω ₀ ⁽ⁱ⁾;

As j=1 ~ t-1, by coefficient ω _j-1 ⁽ⁱ⁾and factor sigma _jcalculate ω ⁽ⁱ⁾coefficient ω _j ⁽ⁱ⁾.

In common parallel iBM algorithm, many places adopt time-sharing multiplex mode, greatly can reduce the consumption of Galois field multiplier, simultaneously when calculating at every turn, avoid to take advantage of and add tree structure, significantly reduce path delay and improve chip clock frequency.

After this enter step 303, video optical multiplexer receiving terminal makes to spend money search and Forney algorithm from error location polynomial σ (x) obtained=σ ₀+ σ ₁x+ ... + σ _t-1x ^t-1+ σ _tx ^twith improper value multinomial ω (x)=ω ₀+ ω ₁x+ ... + ω _t-1x ^t-1calculate the errors present of code element and corresponding wrong amplitude;

After this enter step 304, judge whether to there is symbol error;

If so, then step 305 is entered, otherwise process ends;

In step 305, if there is symbol error, video optical multiplexer receiving terminal then carries out decoding according to the errors present of code element and corresponding wrong amplitude to the data received.

After this process ends.

In various embodiments of the present invention, only to error location polynomial or only to improper value multinomial employing decomposition serial operation, also decomposition serial operation can all be adopted to error location polynomial and improper value multinomial.

By common parallel iBM algorithm serial decompositionization is calculated, when not affecting continuous decoding, greatly reducing the hardware resource solved needed for key equation, reducing path delay simultaneously.In addition, optimizing money search and Forney algorithmic procedure by merging, splitting by time item of the odd even in error location polynomial and improper value multinomial, decreasing control logic and double counting.Therefore, hardware resource consumption of the present invention is only 1/2 ~ 1/3 of common iBM algorithm realization, and maximum clock frequency and valid data bandwidth improve about 30%, IA High Speed Channel error correcting technique can be made to be applied on low density chip, reduce cost.

Third embodiment of the invention relates to a kind of data transmission method for uplink for digital video fiber optic transmitter system.Fig. 4 is this schematic flow sheet for the data transmission method for uplink of digital video fiber optic transmitter system.This digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, and as shown in Figure 4, this data transmission method for uplink being used for digital video fiber optic transmitter system comprises the following steps:

In step 401, video optical multiplexer transmitting terminal is according to coding redundancy degree, select corresponding forward error correction coding mode to sent video data encoding, this coding redundancy degree obtains according to error rate adjustment, and this error rate is the error rate of the video data of being decoded by decoding FEC mode by video optical multiplexer receiving terminal.

After this enter step 402, video optical multiplexer transmitting terminal sends encoded video data by optical fiber and represents the information of this video data encoding redundancy, receives for video optical multiplexer receiving terminal;

After this process ends.

According to error rate adjustment coding redundancy degree, dynamically determine whether to need to take forward error correction coding mode, thus realize the self adaptation error detection of forward error correction coding/decoding technology and error correction.

According to the error rate, the step of adjustment coding redundancy degree, side can be received at video optical multiplexer perform rear and coding redundancy degree adjustment result feedback is sent side to video optical multiplexer, to select corresponding forward error correction coding mode to sent video data encoding.Or also can receive the error rate of side feedback according to video optical multiplexer, video optical multiplexer sends side adjustment coding redundancy degree.

Four embodiment of the invention relates to a kind of data transmission method for uplink for digital video fiber optic transmitter system.Fig. 5 is this schematic flow sheet for the data transmission method for uplink of digital video fiber optic transmitter system.

4th execution mode improves on the basis of the 3rd execution mode, main improvements are: judged by error rate thresholding, the corresponding error rate of adjustment up and down rank, and according to this rank correspondence adjustment coding redundancy degree, thus dynamically determine whether to need to take forward error correction coding mode, thus realize the self adaptation error detection of forward error correction coding/decoding technology and error correction.For the error rate less or be zero time, do not take forward error correction coding mode and direct coding, resource consumption can be reduced, improve coding rate.By abandoning the insensitive partial data of part human eye, adjustment video data format carries out lossy compression method transmission, is meeting in the hostile transmission environment situations such as longer transmission distance, can ensure the visual effect of video data or the auditory effect of voice data.Specifically:

At video optical multiplexer transmitting terminal according to coding redundancy degree, select corresponding forward error correction coding mode to sent video data encoding step 401 before, further comprising the steps of:

Judge whether the error rate is greater than the thresholding pre-set.

If so, the rank of the error rate is then adjusted upward.

If not, then the rank of the error rate is adjusted downwards.

In some other execution modes of the present invention, according to the step of error rate adjustment coding redundancy degree, can also be realized by adjustment threshold range, such as, this adjustment process comprises the following steps:

Judge whether the error rate is greater than the first thresholding pre-set.

This thresholding can for judging the above-mentioned thresholding during error rate, and also can be above-mentioned first thresholding when judging the error rate, also can be above-mentioned second thresholding when judging the error rate.

Video optical multiplexer transmitting terminal, according to coding redundancy degree, is selected corresponding forward error correction coding mode to sent the step 401 of video data encoding, is also comprised following sub-step:

Judge whether coding redundancy degree is zero.

Video optical multiplexer transmitting terminal sends encoded video data by optical fiber and represents the step 402 of information of this video data encoding redundancy, comprises following sub-step:

Being not limited in coding redundancy degree in the basis for estimation of carrying out direct coding to sent video data is zero, also can be coding redundancy degree non-vanishing time basis for estimation, such as coding redundancy degree is 1 or 2.

If so, then video optical multiplexer transmitting terminal, to sent video data lossy compression method, abandons the insensitive partial data of the mankind, and adjusts video data format.

Whether video optical multiplexer transmitting terminal carries out the basis for estimation of lossy compression method to sent video data, also can be the classification situation of the error rate, if the rank of the error rate equals the rank at transmission standard acceptable maximum bit error rate place, then carry out lossy compression method.

As a preferred embodiment of the present invention, as shown in Figure 5, this data transmission method for uplink being used for digital video fiber optic transmitter system is further comprising the steps of:

In step 501, video optical multiplexer transmitting terminal judges whether the error rate is greater than the thresholding pre-set.

If so, then enter step 502, otherwise enter step 503.

In step 502, when the error rate is greater than the thresholding pre-set, then video optical multiplexer transmitting terminal adjusts upward the rank of the error rate, after this enters step 504.

In step 503, when the error rate is not more than the thresholding pre-set, then video optical multiplexer transmitting terminal adjusts the rank of the error rate downwards, after this enters step 504.

In step 504, video optical multiplexer transmitting terminal is according to the rank of the error rate through adjustment, and correspondence adjusts coding redundancy degree.

After this enter step 505, video optical multiplexer transmitting terminal judges whether the error rate is greater than the first threshold pre-set, and this first threshold is greater than the thresholding used of the judgement before rank adjusting.

If so, then enter step 506, otherwise enter step 507.

In step 506, when the error rate is greater than the first threshold pre-set, video optical multiplexer transmitting terminal is to sent video data lossy compression method, and this lossy compression method process comprises and abandons the insensitive partial data of the mankind, and adjusts the step of video data format.

After this enter step 507, video optical multiplexer transmitting terminal, according to the coding redundancy degree through adjustment, selects corresponding forward error correction coding mode to the video data encoding through lossy compression method.

After this process ends.

Fifth embodiment of the invention relates to a kind of data receive method for digital video fiber optic transmitter system.Fig. 6 is this schematic flow sheet for the data receive method of digital video fiber optic transmitter system.This digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, and as shown in Figure 6, this data receive method being used for digital video fiber optic transmitter system comprises the following steps:

In step 601, video optical multiplexer receiving terminal is by optical fiber receiving video data and the information representing this video data encoding redundancy.

After this enter step 602, video optical multiplexer receiving terminal, according to coding redundancy degree information, selects corresponding decoding FEC mode to received video data decoding.

After this step 603 is entered, video optical multiplexer receiving terminal calculates the error rate of the video data through decoding, when spending for adjustment coding redundancy, this coding redundancy degree is used for video optical multiplexer transmitting terminal to sent the corresponding forward error correction coding mode of video data encoding process choosing.

After this process ends.

According to the error rate, the step of adjustment coding redundancy degree, can receive side at video optical multiplexer and perform rear and coding redundancy degree adjustment result feedback is sent side to video optical multiplexer, to select corresponding forward error correction coding mode to sent data encoding.Or also can receive after side performs the step of the error rate of the data calculated through decoding by video optical multiplexer, and this error rate be fed back to video optical multiplexer and send side and be used for performing step according to error rate adjustment coding redundancy degree.

Sixth embodiment of the invention relates to a kind of data receive method for digital video fiber optic transmitter system.

6th execution mode improves on the basis of the 5th execution mode, and main improvements are: to receive coding redundancy degree be zero data directly decode, can resource consumption be reduced, improve decoding speed.Specifically:

After video optical multiplexer receiving terminal calculates the step of the error rate of the data through decoding, further comprising the steps of:

Judge whether the error rate is greater than the thresholding pre-set.

If so, the rank of the error rate is then adjusted upward.

If not, then the rank of the error rate is adjusted downwards.

In some other execution modes of the present invention, according to the step of error rate adjustment coding redundancy degree, can also be realized by adjustment threshold range, such as, this adjustment process is realized by following steps:

Judge whether the error rate is greater than the first thresholding pre-set.

After video optical multiplexer receiving terminal to be received data and represents this data encoding redundancy step of information by optical fiber, further comprising the steps of:

Judge whether coding redundancy degree is zero.

If so, then video data is directly decoded.

Directly decode the method referring to and do not use decoding FEC mode to directly decode.

At video optical multiplexer receiving terminal according to the information representing coding redundancy degree, select corresponding decoding FEC mode to after the step of video data decoding, further comprising the steps of:

Video optical multiplexer receiving terminal, according to the information representing coding redundancy degree, carries out decompress(ion) to the video data through decoding.

Represent the information of video data encoding redundancy, also can comprise and whether compressing and the information (such as lossy compression method) of compressed format, receiving the process of compressed video data, according to this information to the corresponding decompress(ion) of video data.

In the error correcting capability of institute's code be t code element, this data receive method being used for digital video fiber optic transmitter system comprises:

2t syndrome S is calculated to the video data received _ito form associated polynomial S (x), wherein i=0 ~ 2t-1;

Use iBM algorithm, solve key equation S (x) σ (x)=ω (x) mod x by described associated polynomial S (x) ^2t, to obtain error location polynomial σ (x)=σ ₀+ σ ₁x+ ... + σ _t-1x ^t-1+ σ _tx ^twith improper value multinomial ω (x)=ω ₀+ ω ₁x+ ... + ω _t-1x ^t-1, wherein mod represents remainder, in i-th iteration of mistake in computation position multinomial σ (x), sequentially calculates intermediate variable σ respectively in t+1 cycle ⁽ⁱ⁾t+1 factor sigma ₀ ⁽ⁱ⁾, σ ₁ ⁽ⁱ⁾σ _t ⁽ⁱ⁾, each computation of Period coefficient;

Make to spend money search and Forney algorithm from error location polynomial σ (x) obtained=σ ₀+ σ ₁x+ ... + σ _t-1x ^t-1+ σ _tx ^twith improper value multinomial ω (x)=ω ₀+ ω ₁x+ ... + ω _t-1x ^t-1calculate the errors present of code element and corresponding wrong amplitude;

If there is symbol error, video optical multiplexer receiving terminal then carries out decoding according to the errors present of code element and corresponding wrong amplitude to the data received.

Each method execution mode of the present invention all can realize in modes such as software, hardware, firmwares.No matter the present invention realizes with software, hardware or firmware mode, instruction code can be stored in the addressable memory of computer of any type (such as permanent or revisable, volatibility or non-volatile, solid-state or non-solid, fixing or removable medium etc.).Equally, memory can be such as programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), read-only memory (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc, be called for short " DVD ") etc.

Seventh embodiment of the invention relates to a kind of data transmission system for digital video fiber optic transmitter system.Fig. 7 is this structural representation for the data transmission system of digital video fiber optic transmitter system.This digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, video optical multiplexer receiving terminal comprises receiving element, decoding unit and computing unit, and video optical multiplexer transmitting terminal comprises coding unit and transmitting element.

Receiving element, for by optical fiber receiving video data and the information representing this video data encoding redundancy.

Decoding unit, for according to the information representing coding redundancy degree, selects corresponding decoding FEC mode to the video data decoding received by receiving element.

Computing unit, for calculating the error rate of the video data through decoding unit decodes.

Adjustment unit, for the error rate calculated according to computing unit, adjustment coding redundancy degree.

Coding unit, for according to the coding redundancy degree adjusted through adjustment unit, selects corresponding forward error correction coding mode to sent video data encoding.

Adjustment unit is according to error rate adjustment coding redundancy degree, coding unit dynamically determines whether to need to take forward error correction coding mode, and decoding unit takes the decoding FEC mode of corresponding coding redundancy degree, thus realize the self adaptation error detection of forward error correction coding/decoding technology and error correction.

According to the error rate, the adjustment unit of adjustment coding redundancy degree, video optical multiplexer receiving terminal can be contained in, by coding redundancy degree adjustment result feedback to video optical multiplexer transmitting terminal, select corresponding forward error correction coding mode to sent video data encoding with coding unit after performing the adjustment of coding redundancy degree.Or also can be contained in video optical multiplexer transmitting terminal, perform the step of the error rate of the video data calculated through decoding at computing unit after, this error rate is fed back to adjustment unit by computing unit, with the error rate calculated according to computing unit, and adjustment coding redundancy degree.Also can independent of video optical multiplexer receiving terminal and video optical multiplexer transmitting terminal, for the error rate adjustment coding redundancy degree calculated according to computing unit, and this coding redundancy degree is fed back to coding unit encode.

When decoding to the video data received, by representing the information of video data encoding redundancy, corresponding decoding FEC mode can be selected, as corresponding forward error correction algorithm.

First execution mode is the method execution mode corresponding with present embodiment, and present embodiment can be worked in coordination with the first execution mode and be implemented.The relevant technical details mentioned in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.

Eighth embodiment of the invention relates to a kind of data transmission system for digital video fiber optic transmitter system.Fig. 8, Fig. 9, Figure 10 and Figure 11 are this structural representations for the data transmission system of digital video fiber optic transmitter system.

8th execution mode improves on the basis of the 7th execution mode, main improvements are: rank adjusting subelement is judged by error rate thresholding, the corresponding error rate of adjustment up and down rank, adjustment subelement is according to this rank correspondence adjustment coding redundancy degree, thus make coding unit dynamically determine whether to need to take forward error correction coding mode, and decoding unit takes the decoding FEC mode of which kind of coding redundancy degree, thus realize the self adaptation error detection of forward error correction coding/decoding technology in this transmission system and error correction.For the error rate less or be zero time, coding unit does not take forward error correction coding mode and direct coding, can reduce resource consumption, improves coding rate.Decoding unit to receive coding redundancy degree be zero data directly decode, can resource consumption be reduced, improve decoding speed.By abandoning the insensitive partial data of part human eye, adjustment video data format carries out lossy compression method transmission, is meeting in the hostile transmission environment situations such as longer transmission distance, can ensure the visual effect of video data or the auditory effect of voice data.In employing, institute's code carries out encoding and decoding, and to the random error and burst error error correction that the video data through transmission produces, and error correction effect is good.

As a preferred embodiment of the present invention, as shown in Figure 8, specifically:

Adjustment unit, comprising:

First judgment sub-unit, for judging whether the error rate that unit calculates as calculated is greater than the thresholding pre-set.

Rank adjusting subelement, during for judging that the error rate is greater than the thresholding pre-set according to the first judgment sub-unit, adjust upward the rank of the error rate, or when judging that the error rate is not more than the thresholding pre-set according to the first judgment sub-unit, the rank of the adjustment error rate downwards.

Adjustment subelement, for the rank according to the error rate adjusted through rank adjusting subelement, corresponding adjustment coding redundancy degree.

Arrange the rank of the error rate according to thresholding correspondence, if belong to minimum rank through the rank of the error rate of adjustment, then coding redundancy degree can be zero.

In some other execution modes of the present invention, adjustment unit, according to the error rate, adjusts the process of coding redundancy degree, and can also be realized by adjustment threshold range, such as, the adjustment process of this adjustment unit comprises the following steps:

Judge whether the error rate is greater than the first thresholding pre-set.

This data transmission system being used for digital video fiber optic transmitter system also comprises:

First judging unit, for judging whether the coding redundancy degree obtained through adjustment unit adjustment is zero.

Coding unit, also for judge at the first judging unit coding redundancy degree as zero time, to sent video data direct coding.

Transmitting element, also for being sent the video data of this direct coding by optical fiber and representing the information of coding redundancy degree of video data of this direct coding.

Direct coding refers to and does not use forward error correction coding mode to carry out the method for encoding.

Second judging unit, for judging whether the coding redundancy degree of the video data received by receiving element is zero.

Decoding unit, also for the second judging unit is judged coding redundancy degree as zero video data directly decode.

If judging unit judges that coding redundancy degree is non-vanishing, decoding unit then to received video data according to the information representing this coding redundancy degree, select corresponding decoding FEC mode to decode.

Adjustment unit, also comprises following subelement:

Second judgment sub-unit, for judging whether the error rate that computing unit receives is greater than the first threshold pre-set, this first threshold is greater than the thresholding used of the judgement before rank adjusting.

Compression unit, for when the second judgment sub-unit judges that the error rate is greater than the first threshold pre-set, to sent video data lossy compression method, this lossy compression method process comprises and abandons the insensitive partial data of the mankind, and adjusts the step of video data format.

Decompression units, for according to the information representing coding redundancy degree, carries out decompress(ion) to the video data through decoding unit decodes.

Coding unit, also for according to the coding redundancy degree through adjustment, selects corresponding forward error correction coding mode to the video data encoding of compressed unit lossy compression method.

As shown in Figure 9, the error correcting capability of inner institute code is t code element, and this data transmission system being used for digital video fiber optic transmitter system also comprises:

Syndrome computing unit, calculates 2t syndrome S for the data received receiving element _ito form associated polynomial S (x), wherein i=0 ~ 2t-1;

Key equation solving unit, this key equation solving unit uses iBM algorithm, solves key equation S (x) σ (x)=ω (x) mod x by associated polynomial S (x) ^2t, to obtain error location polynomial σ (x)=σ ₀+ σ ₁x+ ... + σ _t-1x ^t-1+ σ _tx ^twith improper value multinomial ω (x)=ω ₀+ ω ₁x+ ... + ω _t-1x ^t-1, wherein mod represents remainder, in i-th iterative process of this key equation solving unit mistake in computation position multinomial σ (x), sequentially calculates intermediate variable σ respectively in t+1 cycle ⁽ⁱ⁾t+1 factor sigma ₀ ⁽ⁱ⁾, σ ₁ ⁽ⁱ⁾σ _t ⁽ⁱ⁾, each computation of Period coefficient;

Money search and Forney algorithm unit, the search of this money and Forney algorithm unit make to spend money search for and Forney algorithm from error location polynomial σ (x) obtained=σ ₀+ σ ₁x+ ... + σ _t-1x ^t-1+ σ _tx ^twith improper value multinomial ω (x)=ω ₀+ ω ₁x+ ... + ω _t-1x ^t-1calculate the errors present of code element and corresponding wrong amplitude;

Error correction unit, if confirm to there is symbol error for money search and Forney algorithm unit, according to the errors present of code element and corresponding wrong amplitude, the data to reception carry out decoding.

As a preferred embodiment of the present invention, as shown in Figure 10, the multiple path video light end machine transmitting terminal (transmitting terminal) that this data transmission system being used for digital video fiber optic transmitter system is connected by fiber optic network and multiple path video light end machine receiving terminal (receiving terminal) form, and carry out transfer of data by fiber optic network.Wherein, transmitting terminal is to receiving terminal (forward, video flowing direction, namely up, video flowing direction) transmit multi-path high-definition video up in 2.5G bandwidth, this vision signal comprises video flowing, channel status bag, audio stream etc., and oppositely in (descending, control flow check or switching value direction) 155M bandwidth, transmission comprises the signal such as channel status bag, audio signal, asynchronous data, switching value of channel bit error rate.

Transmitting terminal also connects video acquisition device, warning device 1, warning device 2, pick-up 1, instantaneous speech power 1 and network 1, wherein, video acquisition device is for gathering original video data waiting for transmission, warning device 1 is for gathering the alarm signal of transmitting terminal, the alarm signal reduction of warning device 2 for receiving, pick-up 1 is for gathering the audio signal of transmitting terminal, the audio signal reduction of language output device 1 for receiving, network 1 is for sending and receiving network signal, make in user uses, network 1 and network 2 are equivalent to direct connection.

Receiving terminal is connection monitoring device group, warning device 3, warning device 4, pick-up 2, instantaneous speech power 2 and network 2 also, wherein, monitor group user shows each vision signal of transmitting terminal, warning device 3 is for gathering the alarm signal of receiving terminal, the alarm signal reduction of warning device 4 for receiving, pick-up 2 is for gathering the audio signal of receiving terminal, the audio signal reduction of instantaneous speech power 2 for receiving, network 2 is for sending in reception side and receiving network signal, network 1 and network 2, by Fiber connection, are equal to direct-connected.

In the present system, forward error correction coding is selected random error and burst error error correction effect RS code all preferably.Figure 11 is the transmission system structural representation that video optical multiplexer transmitting terminal and video optical multiplexer receiving terminal are formed, as a preferred embodiment of the present invention, as shown in figure 11, there is the transmitting terminal of optical fiber transmission board, by etc. video data subpackage to be sent, RS coding module (RS_encode) equity video data to be sent carries out RS coding, then sends through optical fiber sending module (Fiber_TX); Pass through fiber optic network, there is the receiving terminal of optical fiber dash receiver, optic fiber transceiver module (Fiber_RX) receives the video data that optical fiber sending module (Fiber_TX) sends, RS decoding module (RS_decode) carries out mistake and error correction to the data that optic fiber transceiver module (Fiber_RX) receives, in error tolerance, detect the wrong code element in every bag data and carry out error correction; , wrong code element number is counted, the statistics error rate meanwhile, and the error rate is fed back to transmitting terminal by reverse optical fiber.

The key technology of the present embodiment is at forward error correction coding (Forward Error Correction, be called for short " FEC ") adaptive algorithm of encoding, according to receiving terminal statistical channel fiber channel error condition, adaptively selected RS coding, dynamic conditioning coding redundancy degree, ensures the reliability of transfer of data with FEC coding.In general redundancy its error correcting capability larger of FEC coding is also stronger, but redundancy is larger, and mean that the bandwidth that redundant data takies is also larger, bandwidth availability ratio is lower.

Fiber channel state bag by transmitting between transmitting terminal and receiving terminal during the realizing of this mechanism realizes, and this state handbag is containing a FEC_FLAG mark and BER quantized value (BER all refers to quantize rear value hereinafter).FEC_FLAG is used for flag data the need of forward error correction coding, and the error rate (Bit Error Rate is called for short " BER ") is the ber value after adding up also normalization, and characterize current channel grade, numerical value is larger, and the error rate is larger.

Implementation step is as follows:

1) first step, receiving terminal receives fiber data bag, statistics error rate situation, and by judging error code channel grade, the FEC that BER is greater than design opens threshold value, just transmission one comprise FEC_FLAG be 1 and the state bag of current BER value to transmitting terminal;

2) second step, after transmitting terminal receives state bag, according to BER value, to make an appointment standard by both sides, carries out corresponding dynamic conditioning, FEC intensity and channel bit error rate situation are connected to FEC algorithm;

3) the 3rd step, after adjustment, state bag identical with content for data format is sent to receiving terminal by transmitting terminal, and inform that the current FEC algorithm of its transmitting terminal has adjusted complete, receiving terminal can be decoded by new algorithm;

4) the 4th step, receiving terminal, according to according to the state bag received, adjusts fec decoder algorithm, decodes.Circulate successively.

In this programme, channel bit error rate grade is divided into 4 grades:

Well, BER=0, does not need to use FEC;

Medium, BER=1, needs to use FEC, but selects encoding strength low, the RS(255 that redundancy is few, 239) coding;

Poor, BER=2, needs to use FEC, selects encoding strength higher, RS (255, the 223) coding that redundancy is more;

Extreme difference, BER>=3, needs to use FEC, selects the RS (255,191) that encoding strength is very high, and need compress video data.

It is to be noted, in the present embodiment, if (this kind of situation is considerably less when channel error code grade is extreme difference, only have extra long distance or engineering specifications extreme difference situation), now fiber channel Noise and Interference very severe is described, in the 2.5G bandwidth of now nominal, effective bandwidth cannot meet video transmission bandwidth requirement, in order to carry out image transmitting as possible, be limited to again resource and algorithm complex, lossy compression method has been carried out to image, have selected the simplest 4:2:2 to 4:2:0 in this programme to change, discard the luminance component data of a part, select the RS (255 that encoding strength is very high simultaneously, 191) encode, bandwidth efficiency is 74%, transfer of data is exchanged for by redundancy.But nonetheless, if outside bad channel conditions to error tolerance, also cannot ensure image transmitting.

This programme solves the image flicker that video optical multiplexer under general poor condition causes due to optical fiber error code, bright spot problem, and the solution proposing the image of display as possible under extreme difference condition, be specially adapted in highway, field, the mal-conditions such as the disaster relief use.Under long distance condition, use native system, fibre optic repeater repeater span can be increased, saved fibre optic repeater and be suitable for.And programmable gate array (Field Programmable Gata Array is called for short " FPGA ") the interior realization all at the scene of this partial function, do not increase extra chips device.

Second execution mode is the method execution mode corresponding with present embodiment, and present embodiment can be worked in coordination with the second execution mode and be implemented.The relevant technical details mentioned in second execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the second execution mode.

Ninth embodiment of the invention relates to a kind of digital video fiber optic transmitter.Figure 12 is the structural representation of this digital video fiber optic transmitter.As shown in figure 12, this digital video fiber optic transmitter digital video fiber optic transmitter comprises coding unit and transmitting element, wherein,

Coding unit, for according to coding redundancy degree, select corresponding forward error correction coding mode to sent video data encoding, this coding redundancy degree obtains according to error rate adjustment, and this error rate is the error rate of the video data of decoding through decoding FEC mode.

Comprise coding unit and be connected another digital video fiber optic transmitter with receiving element by fiber optic network with the digital video fiber optic transmitter of transmitting element.

When decoding to the video data received, by representing the information of video data encoding redundancy, corresponding decoding FEC algorithm can be selected.

3rd execution mode is the method execution mode corresponding with present embodiment, and present embodiment can be worked in coordination with the 3rd execution mode and be implemented.The relevant technical details mentioned in 3rd execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the 3rd execution mode.

Tenth embodiment of the invention relates to a kind of digital video fiber optic transmitter.Figure 13 is the structural representation of this digital video fiber optic transmitter.

Tenth execution mode improves on the basis of the 9th execution mode, main improvements are: judged by error rate thresholding, the corresponding error rate of adjustment up and down rank, and according to this rank correspondence adjustment coding redundancy degree, thus dynamically determine whether to need to take forward error correction coding mode, thus realize the self adaptation error detection of forward error correction coding/decoding technology and error correction.For the error rate less or be zero time, coding unit does not take forward error correction coding mode and direct coding, can reduce resource consumption, improves coding rate.By abandoning the insensitive partial data of part human eye, adjustment video data format carries out lossy compression method transmission, is meeting in the hostile transmission environment situations such as longer transmission distance, can ensure the visual effect of video data or the auditory effect of voice data.In employing, institute's code carries out encoding and decoding, good to random error and burst error error correction effect.As shown in figure 13, specifically:

This digital video fiber optic transmitter also comprises: adjustment unit, for the error rate of basis, and adjustment coding redundancy degree.

Adjustment unit, comprises following subelement:

First judgment sub-unit, for judging whether the error rate is greater than the thresholding pre-set.

Rank adjusting subelement, during for judging that the error rate is greater than the thresholding pre-set according to the first judgment sub-unit, adjust upward the rank of the error rate, or when judging that the error rate is not more than the thresholding pre-set according to judgment sub-unit, the rank of the adjustment error rate downwards.

In some other execution modes of the present invention, adjustment unit is according to the step of error rate adjustment coding redundancy degree, and can also be realized by adjustment threshold range, such as, the adjustment process of this adjustment unit comprises the following steps:

Judge whether the error rate is greater than the first thresholding pre-set.

This digital video fiber optic transmitter also comprises:

Adjustment unit, also comprises following subelement:

This digital video fiber optic transmitter also comprises: compression unit, for sent video data lossy compression method, abandons the insensitive partial data of the mankind, and adjusts video data format.

4th execution mode is the method execution mode corresponding with present embodiment, and present embodiment can be worked in coordination with the 4th execution mode and be implemented.The relevant technical details mentioned in 4th execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the 4th execution mode.

Eleventh embodiment of the invention relates to a kind of digital video fiber optic transmitter.Figure 14 is the structural representation of this digital video fiber optic transmitter.This digital video fiber optic transmitter digital video fiber optic transmitter comprises receiving element, decoding unit and computing unit, wherein,

5th execution mode is the method execution mode corresponding with present embodiment, and present embodiment can be worked in coordination with the 5th execution mode and be implemented.The relevant technical details mentioned in 5th execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the 5th execution mode.

Twelveth embodiment of the invention relates to a kind of digital video fiber optic transmitter.Figure 15 is the structural representation of this digital video fiber optic transmitter.

12 execution mode improves on the basis of the 11 execution mode, main improvements are: judged by error rate thresholding, the corresponding error rate of adjustment up and down rank, and according to this rank correspondence adjustment coding redundancy degree, thus dynamically determine whether to need to take forward error correction coding mode, thus realize the self adaptation error detection of forward error correction coding/decoding technology and error correction.To receive coding redundancy degree be zero data directly decode, can resource consumption be reduced, improve decoding speed.Specifically:

Adjustment unit, also comprises following subelement:

In some other execution modes of the present invention, adjustment unit is according to error rate adjustment coding redundancy degree, and can also be realized by adjustment threshold range, such as, the adjustment process of this adjustment unit comprises the following steps:

Judge whether the error rate is greater than the first thresholding pre-set.

This digital video fiber optic transmitter also comprises:

Second judging unit, for judging whether the coding redundancy degree received through receiving element is zero.

Decoding unit, also for judge at the second judging unit coding redundancy degree as zero time, the video data that receiving element receives is directly decoded.

This digital video fiber optic transmitter also comprises:

Decompression units, for the information of the representative coding redundancy degree received by receiving element, carries out decompress(ion) to the video data of decoding through decoding unit.

In the error correcting capability of institute's code be t code element, this digital video fiber optic transmitter also comprises:

6th execution mode is the method execution mode corresponding with present embodiment, and present embodiment can be worked in coordination with the 6th execution mode and be implemented.The relevant technical details mentioned in 6th execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the 6th execution mode.

It should be noted that, the each unit mentioned in the present invention's each equipment execution mode is all logical block, physically, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical location, the Physical realization of these logical blocks itself is not most important, and the combination of the function that these logical blocks realize is only the key solving technical problem proposed by the invention.In addition, in order to outstanding innovative part of the present invention, the unit not too close with solving technical problem relation proposed by the invention is not introduced by the above-mentioned each equipment execution mode of the present invention, and this does not show that the said equipment execution mode does not exist other unit.

It should be noted that, in the claim and specification of this patent, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element " being comprised " limited by statement, and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.

Although by referring to some of the preferred embodiment of the invention, to invention has been diagram and describing, but those of ordinary skill in the art should be understood that and can do various change to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims

1. the data transmission method for digital video fiber optic transmitter system, it is characterized in that, described digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, said method comprising the steps of:

Video optical multiplexer receiving terminal, according to the information representing coding redundancy degree, selects corresponding decoding FEC mode to described video data decoding;

Video optical multiplexer receiving terminal calculates the error rate of the described video data through decoding;

According to the described error rate, adjustment coding redundancy degree;

Video optical multiplexer transmitting terminal, according to the described coding redundancy degree through adjustment, selects corresponding forward error correction coding mode to sent video data encoding;

Video optical multiplexer transmitting terminal sends described encoded video data by optical fiber and represents the information of this video data encoding redundancy.

2. the data transmission method for digital video fiber optic transmitter system according to claim 1, is characterized in that, described according to the error rate, and the step of adjustment coding redundancy degree, comprises following sub-step:

Judge whether the described error rate is greater than the thresholding pre-set;

If so, the rank of the described error rate is then adjusted upward;

If not, then the rank of the described error rate is adjusted downwards;

According to the rank of the described error rate through adjustment, corresponding adjustment coding redundancy degree.

3. the data transmission method for digital video fiber optic transmitter system according to claim 2, is characterized in that, described according to the error rate, after the step of adjustment coding redundancy degree, further comprising the steps of:

Judge whether described coding redundancy degree is zero;

If so, then described video optical multiplexer transmitting terminal to sent video data direct coding;

Described video optical multiplexer transmitting terminal sends the video data of this direct coding by optical fiber and represents the information of coding redundancy degree of video data of this direct coding.

4. the data transmission method for digital video fiber optic transmitter system according to claim 3, it is characterized in that, described video optical multiplexer receiving terminal by optical fiber receiving video data and represent this video data encoding redundancy the step of information after, further comprising the steps of:

Judge whether described coding redundancy degree is zero;

If so, then described video data is directly decoded.

5. the data transmission method for digital video fiber optic transmitter system according to claim 4, it is characterized in that, described video optical multiplexer transmitting terminal is according to the coding redundancy degree through adjustment, select corresponding forward error correction coding mode to sent the step of video data encoding, comprise following sub-step:

Video optical multiplexer transmitting terminal judges whether the error rate is greater than the first threshold pre-set, and this first threshold is greater than described thresholding;

If so, then described video optical multiplexer transmitting terminal, to sent video data lossy compression method, abandons the insensitive partial data of the mankind, and adjusts video data format and coding redundancy degree;

Video optical multiplexer transmitting terminal, according to the described coding redundancy degree through adjustment, selects corresponding forward error correction coding mode to the video data encoding through lossy compression method.

6. the data transmission method for digital video fiber optic transmitter system according to any one of claim 1 to 5, it is characterized in that, institute's code in described forward error correction coding mode and decoding FEC mode adopt, and the error correcting capability of described inner institute code is t code element, described method is further comprising the steps of:

Video optical multiplexer receiving terminal calculates 2t syndrome S to the video data received _ito form associated polynomial S (x), wherein i=0 ~ 2t-1;

Video optical multiplexer receiving terminal uses iBM algorithm, solves key equation S (x) σ (x)=ω (x) mod x by described associated polynomial S (x) ^2t, to obtain error location polynomial σ (x)=σ ₀+ σ ₁x+ ... + σ _t-1x ^t-1+ σ _tx ^twith improper value multinomial ω (x)=ω ₀+ ω ₁x+ ... + ω _t-1x ^t-1, wherein mod represents remainder, in i-th iteration of mistake in computation position multinomial σ (x), sequentially calculates intermediate variable σ respectively in t+1 cycle ⁽ⁱ⁾t+1 factor sigma ₀ ⁽ⁱ⁾, σ ₁ ⁽ⁱ⁾σ _t ⁽ⁱ⁾, each computation of Period coefficient;

Video optical multiplexer receiving terminal makes to spend money search and Forney algorithm from error location polynomial σ (x) obtained=σ ₀+ σ ₁x+ ... + σ _t-1x ^t-1+ σ _tx ^twith improper value multinomial ω (x)=ω ₀+ ω ₁x+ ... + ω _t-1x ^t-1calculate the errors present of code element and corresponding wrong amplitude;

7. the data transmission method for uplink for digital video fiber optic transmitter system, it is characterized in that, described digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, said method comprising the steps of:

Video optical multiplexer transmitting terminal sends described encoded video data by optical fiber and represents the information of this video data encoding redundancy, receives for video optical multiplexer receiving terminal.

8. the data transmission method for uplink for digital video fiber optic transmitter system according to claim 7, it is characterized in that, at described video optical multiplexer transmitting terminal according to coding redundancy degree, select corresponding forward error correction coding mode to sent video data encoding step before, further comprising the steps of:

If so, the rank of the described error rate is then adjusted upward;

If not, then the rank of the described error rate is adjusted downwards;

9. the data transmission method for uplink for digital video fiber optic transmitter system according to claim 8, it is characterized in that, described video optical multiplexer transmitting terminal, according to coding redundancy degree, is selected corresponding forward error correction coding mode to sent the step of video data encoding, is also comprised following sub-step:

Judge whether described coding redundancy degree is zero;

If so, then video optical multiplexer transmitting terminal to sent video data direct coding;

Described video optical multiplexer transmitting terminal sends described encoded video data by optical fiber and represents the step of information of this video data encoding redundancy, comprises following sub-step:

10. the data transmission method for uplink for digital video fiber optic transmitter system according to claim 9, it is characterized in that, described video optical multiplexer transmitting terminal, according to coding redundancy degree, is selected corresponding forward error correction coding mode to sent the step of video data encoding, is also comprised following sub-step:

If so, then described video optical multiplexer transmitting terminal, to sent video data lossy compression method, abandons the insensitive partial data of the mankind, and adjusts video data format;

11. data transmission method for uplink for digital video fiber optic transmitter system according to any one of claim 7 to 10, is characterized in that, institute's code in described forward error correction coding mode and decoding FEC mode adopt.

12. 1 kinds of data receive methods for digital video fiber optic transmitter system, it is characterized in that, described digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, said method comprising the steps of:

Video optical multiplexer receiving terminal, according to described coding redundancy degree information, selects corresponding decoding FEC mode to described video data decoding;

Video optical multiplexer receiving terminal calculates the error rate of the described video data through decoding, and when spending for adjustment coding redundancy, this coding redundancy degree is used for video optical multiplexer transmitting terminal to sent the corresponding forward error correction coding mode of video data encoding process choosing.

13. data receive methods for digital video fiber optic transmitter system according to claim 12, is characterized in that, after described video optical multiplexer receiving terminal calculates the step of the error rate of the data through decoding, further comprising the steps of:

If so, the rank of the described error rate is then adjusted upward;

If not, then the rank of the described error rate is adjusted downwards;

14. data receive methods for digital video fiber optic transmitter system according to claim 13, it is characterized in that, after described video optical multiplexer receiving terminal to be received data and represents this data encoding redundancy step of information by optical fiber, further comprising the steps of:

Judge whether described coding redundancy degree is zero;

If so, then described video data is directly decoded.

15. data receive methods for digital video fiber optic transmitter system according to claim 14, it is characterized in that, at described video optical multiplexer receiving terminal according to the information representing coding redundancy degree, select corresponding decoding FEC mode to after the step of video data decoding, further comprising the steps of:

16. according to claim 12 to the data receive method for digital video fiber optic transmitter system according to any one of 15, it is characterized in that, institute's code in described forward error correction coding mode and decoding FEC mode adopt, and the error correcting capability of described inner institute code is t code element, described method comprises:

17. 1 kinds of data transmission systems for digital video fiber optic transmitter system, it is characterized in that, described digital video fiber optic transmitter system comprises: at least one video optical multiplexer receiving terminal interconnected through fiber optic network and at least one video optical multiplexer transmitting terminal, described video optical multiplexer receiving terminal comprises receiving element, decoding unit and computing unit, and described video optical multiplexer transmitting terminal comprises coding unit and transmitting element;

Described transmission system comprises:

Described receiving element, for by optical fiber receiving video data and the information representing this video data encoding redundancy;

Described decoding unit, for according to the information representing coding redundancy degree, selects corresponding decoding FEC mode to the video data decoding received by described receiving element;

Described computing unit, for calculating the error rate of the video data through described decoding unit decodes;

Adjustment unit, for the error rate calculated according to described computing unit, adjustment coding redundancy degree;

Described coding unit, for according to the coding redundancy degree adjusted through described adjustment unit, selects corresponding forward error correction coding mode to sent video data encoding;

Described transmitting element, for sent by optical fiber through described encoded cell encoding video data and represent the information of this video data encoding redundancy.

18. data transmission systems for digital video fiber optic transmitter system according to claim 17, it is characterized in that, described adjustment unit, comprising:

First judgment sub-unit, for judging whether the error rate calculated through described computing unit is greater than the thresholding pre-set;

Rank adjusting subelement, during for judging that the error rate is greater than the thresholding pre-set according to described first judgment sub-unit, adjust upward the rank of the described error rate, or when judging that the error rate is not more than the thresholding pre-set according to described first judgment sub-unit, the rank of the described error rate of adjustment downwards;

Adjustment subelement, for the rank according to the error rate through described rank adjusting subelement adjustment, corresponding adjustment coding redundancy degree.

19. data transmission systems for digital video fiber optic transmitter system according to claim 18, is characterized in that, also comprise:

First judging unit, for judging whether the coding redundancy degree obtained through the adjustment of described adjustment unit is zero;

Described coding unit, also for judge at described first judging unit coding redundancy degree as zero time, to sent video data direct coding;

Described transmitting element, also for being sent the video data of this direct coding by optical fiber and representing the information of coding redundancy degree of video data of this direct coding.

20. data transmission systems for digital video fiber optic transmitter system according to claim 19, is characterized in that, also comprise:

Second judging unit, for judging whether the coding redundancy degree of the video data received by described receiving element is zero;

Described decoding unit, also for described second judging unit is judged coding redundancy degree as zero video data directly decode.

21. data transmission systems for digital video fiber optic transmitter system according to claim 20, is characterized in that described adjustment unit also comprises following subelement:

Second judgment sub-unit, for judging whether the error rate that described computing unit receives is greater than the first threshold pre-set, and this first threshold is greater than described thresholding;

Described data transmission system also comprises:

Compression unit, for when described second judgment sub-unit judges that the error rate is greater than the first threshold pre-set, to sent video data lossy compression method, abandons the insensitive partial data of the mankind, and adjusts video data format;

Decompression units, for according to the information representing coding redundancy degree, carries out decompress(ion) to the video data through described decoding unit decodes;

Described coding unit, also for according to the coding redundancy degree through adjustment, selects corresponding forward error correction coding mode to the video data encoding through described compression unit lossy compression method.

22. according to claim 17 to the data transmission system for digital video fiber optic transmitter system according to any one of 21, it is characterized in that, institute's code in described forward error correction coding mode and decoding FEC mode adopt, and the error correcting capability of described inner institute code is t code element, described transmission system also comprises:

Syndrome computing unit, calculates 2t syndrome S for the data received described receiving element _ito form associated polynomial S (x), wherein i=0 ~ 2t-1;

Key equation solving unit, this key equation solving unit uses iBM algorithm, solves key equation S (x) σ (x)=ω (x) mod x by described associated polynomial S (x) ^2t, to obtain error location polynomial σ (x)=σ ₀+ σ ₁x+ ... + σ _t-1x ^t-1+ σ _tx ^twith improper value multinomial ω (x)=ω ₀+ ω ₁x+ ... + ω _t-1x ^t-1, wherein mod represents remainder, in i-th iterative process of this key equation solving unit mistake in computation position multinomial σ (x), sequentially calculates intermediate variable σ respectively in t+1 cycle ⁽ⁱ⁾t+1 factor sigma ₀ ⁽ⁱ⁾, σ ₁ ⁽ⁱ⁾σ _t ⁽ⁱ⁾, each computation of Period coefficient;

Error correction unit, if confirm to there is symbol error for the search of described money and Forney algorithm unit, carries out decoding according to the errors present of code element and the data of corresponding wrong amplitude to reception.

23. 1 kinds of digital video fiber optic transmitters, is characterized in that, described digital video fiber optic transmitter comprises coding unit and transmitting element, wherein,

Described coding unit, for according to coding redundancy degree, select corresponding forward error correction coding mode to sent video data encoding, this coding redundancy degree obtains according to error rate adjustment, and this error rate is the error rate of the video data of decoding through decoding FEC mode;

Described transmitting element, by optical fiber transmission through the video data of described encoding unit encodes and the information representing this video data encoding redundancy, receives for receiving element.

24. digital video fiber optic transmitters according to claim 23, is characterized in that, also comprise: adjustment unit, for the error rate of basis, and adjustment coding redundancy degree;

Described adjustment unit, comprising:

First judgment sub-unit, for judging whether the error rate is greater than the thresholding pre-set;

Rank adjusting subelement, during for judging that the error rate is greater than the thresholding pre-set according to described first judgment sub-unit, adjust upward the rank of the described error rate, or when judging that the error rate is not more than the thresholding pre-set according to described judgment sub-unit, the rank of the described error rate of adjustment downwards;

25. digital video fiber optic transmitters according to claim 24, is characterized in that, also comprise:

26. digital video fiber optic transmitters according to claim 25, is characterized in that, described adjustment unit also comprises following subelement:

Described digital video fiber optic transmitter also comprises: compression unit, for sent video data lossy compression method, abandons the insensitive partial data of the mankind, and adjusts video data format;

Described coding unit, also for according to the coding redundancy degree through adjustment, selects corresponding forward error correction coding mode to the video data encoding of compressed unit lossy compression method.

27. digital video fiber optic transmitters according to any one of claim 23 to 26, is characterized in that, institute's code in described forward error correction coding mode and decoding FEC mode adopt.

28. 1 kinds of digital video fiber optic transmitters, is characterized in that, described digital video fiber optic transmitter comprises receiving element, decoding unit and computing unit, wherein,

Described computing unit, for calculating the error rate of the video data through described decoding unit decodes, when spending for adjustment coding redundancy, this coding redundancy degree is used for sent the corresponding forward error correction coding mode of video data encoding process choosing.

29. digital video fiber optic transmitters according to claim 28, is characterized in that, also comprise: adjustment unit, for the error rate of basis, and adjustment coding redundancy degree;

Described adjustment unit, comprising:

30. digital video fiber optic transmitters according to claim 29, is characterized in that, also comprise:

Second judging unit, for judging whether the coding redundancy degree received through described receiving element is zero;

Described decoding unit, also for judge at described second judging unit coding redundancy degree as zero time, the video data that described receiving element receives is directly decoded.

31. digital video fiber optic transmitters according to claim 30, is characterized in that, also comprise:

Decompression units, for the information of the representative coding redundancy degree received by described receiving element, carries out decompress(ion) to the video data of decoding through described decoding unit.

32. digital video fiber optic transmitters according to any one of claim 28 to 31, it is characterized in that, institute's code in described forward error correction coding mode and decoding FEC mode adopt, and the error correcting capability of described inner institute code is t code element, described digital video fiber optic transmitter also comprises: