CN104184741A - Method for distributing massive audio and video data into distribution server - Google Patents

Abstract

The invention discloses a method for distributing massive audio and video data into a distribution server. The method comprises the steps of 1, transmitting the received massive data to a data source server, dividing the massive data into N data file fragmentations independent to each other through the data source server, distributing data of each data file fragmentation separately, distributing data of each data file fragmentation to a target node server, and setting an optimal service bandwidth for distributing data in the N data file fragmentations; 2, dividing each of the N data file fragmentations into M data file fragmentations again through the target node server after the optimal service bandwidth for distributing data in the N data file fragmentations is set, and distributing data of the M data file fragmentations to target node sub-servers until the all the data are distributed out.

Description

The distribution method of audio frequency and video mass data in Distributor

Technical field

The present invention relates to computer realm, relate in particular to the distribution method of a kind of audio-visual data in Distributor.

Background technology

Because network data transmission total amount constantly increases, the distribution management of mass data, and transmission stability, become the bottleneck problem of transmitting data speed in restriction Distributor, the Data dissemination strategy of existing Distributor, be subject to the constraint of Internet bandwidth fluctuation, thereby reduced the performance of Data dissemination, simultaneously, existing Data dissemination strategy is in whole mass data distribution procedure, the distribution policy that can only distributing data starts the distribution bandwidth of the calculating destination node before transmission, can not adapt to bandwidth fluctuation, in actual internet, applications, use unsatisfactory, and the available bandwidth of the overall process destination node of existing SeverCast algorithm tentation data distribution remains unchanged, when the bandwidth fluctuation of Internet, the static state distribution mode decision scheme that ServerCast adopts can cause hydraulic performance decline, and this is just needing those skilled in the art badly and is solving corresponding technical problem.

Summary of the invention

The present invention is intended at least solve the technical problem existing in prior art, has proposed to special innovation a kind of audio frequency, the video data distribution method in Distributor.

In order to realize above-mentioned purpose of the present invention, the invention provides the distribution method of a kind of audio frequency and video mass data in Distributor, its key is, comprises the steps:

Step 1, after mass data is received, be transferred to data source server, described data source server is divided into N data file fragmentation by described mass data, each data file burst in N data file fragmentation is separate, described data source server is carried out Data dissemination by each data file burst separately, and the Data dissemination of each data file burst, to destination node server, is arranged to N the Data dissemination optimised service bandwidth in data file fragmentation during distribution;

Step 2, arrange after N the Data dissemination optimised service bandwidth in data file fragmentation, described destination node server is divided into M data file fragmentation again for each the data file burst in N data file fragmentation, to being again divided into M data file fragmentation, carry out Data dissemination, be distributed to destination node child servers, until total data distribution is complete, described M, N are positive integer.

The distribution method of described audio frequency and video mass data in Distributor, preferred, described step 1 comprises:

Step 1-1, making each the data file burst in described N data file fragmentation is FD _i, described subscript i is positive integer;

Step 1-2, data source server S _swith destination node server S _ibetween exchange current available data source server network bandwidth B _swith destination node server network bandwidth B _i, described subscript s is data source server label,

Step 1-3, establishes data source server network bandwidth B _savailable bandwidth for data source server; B _iavailable bandwidth for N destination node server; B _i,jthat collaborative distribution phase is by S _ito S _jduring forwarding data, be S _jdistribution bandwidth i ≠ the j distributing, described subscript i, j are positive integer;

Step 1-4, data source server network bandwidth B _swith destination node network bandwidth B _imutually provide PSP data sharing service data retransmission total bandwidth difference hour, obtain the highest Data dissemination performance, corresponding to the minimized Data dissemination deadline, so data source server S _sto destination node server S _kprovide the optimised service bandwidth of Data distributing to be, described subscript k is a destination node server,

$B_{s,k}=\frac{B_k}{M-1}+\frac{1}{M}\×\{B_s-\frac{1}{M-1}\×{\mathrm{\Σ}}_{i=1}^M{B}_i\};$

Step 1-5, calculates this Data dissemination and distributes to each destination node server S _idistribution bandwidth B _s,i.

The distribution method of described audio frequency and video mass data in Distributor, preferred, described step 2 comprises:

Step 2-1, by data source server S _iby current each data file burst FD that will distribute _ifurther be divided into M burst, be designated as FD _i,j, it represents file fragmentation FD _ibe distributed to the secondary burst of destination node child servers j, and its size meets following formula,

$\left|{\mathrm{FD}}_{i,j}\right|=\left|{\mathrm{FD}}_i\right|\×\frac{B_{s,j}}{B_s},$

Be allocated to each destination node child servers S _jsecondary burst size, be data source server S _sdistribute to destination node child servers S _jdistribution bandwidth B _s,jwith S _ssuper-distribution bandwidth B _svalue be directly proportional, make each destination node child servers S _jthe time that receives entire data is identical.

Step 2-2, by data source server S _sby each data file burst FD _ibe allocated to each destination node child servers S _jsecondary burst FD _i,j, the parallel destination node distribution bandwidth B calculating in step 2-1 _s,jsend to destination node child servers S _j;

Step 2-3, as destination node child servers S _jbeginning is from data source server S _swhile receiving data, start the synergistic data distribution mechanisms between destination node, to other M-1 node in destination node child servers with data rate forward own to data source server S _sthe data that receive; Described B' _krefer to data source server S _swith destination node child servers S _jthe bandwidth that consumed of data, that is,

$B_k^{\′}=B_k-B_{s,k}-{\mathrm{\Σ}}_{\underset{i\≠k}{i=1}}^M\frac{B_k^{\′}}{M-1}.$

The distribution method of described audio frequency and video mass data in Distributor, preferred, also comprise:

N data file fragmentation carried out to random chip select and send to destination node server, and connect with terminal, then, multicast address is set terminal is joined in multicast address, receive and send multicast message, making the service efficiency of data source server and destination node server higher.

The distribution method of described audio frequency and video mass data in Distributor, preferred, comprising:

S1, definition basic variable, comprises terminal Socket input structure body, multicast address structure and receiving multicast message array;

S2, creates the socket for network service, and socket communication modes is made as to UDP, judges whether terminal socket creates successfully, and successful continuation is carried out, otherwise quits a program;

S3, setting to add terminal multicast address, data source server or destination node server group address are set, the terminal address information that sends multicast message are set;

S4, adds multicast address terminal, and terminal network interface card, as multicast member, only adds data source server or destination node server group just can receive multicast message; Judge that terminal adds multicast address whether successful, successful continuation is carried out, otherwise quits a program;

S5, calculates the size of the machine input structure body, and offers for it the internal memory of corresponding size, and terminal called connected mode UDP and port are set;

S6, binding data source server or destination node Service-Port and IP information are to terminal socket; Judge whether binding success, successful continuation is carried out, otherwise quits a program;

S7, empties the array of receiving terminal multicast message, and circulation receiving terminal multicast message is if do not receive multicast message in circulation, complete.

In sum, owing to having adopted technique scheme, the invention has the beneficial effects as follows:

By improving the Data dissemination strategy of ServerCast, overcome the impact that its performance is subject to the fluctuation of the Internet network bandwidth, can further improve Data dissemination performance.

For real-time Internet flow load situation, dynamically adjust the distribution bandwidth that data source server is distributed to each destination node, simultaneously in conjunction with P2P distribution algorithms, not only overcome the destination node calculating before ServerCast algorithm is only used in the whole file data distribution procedure distribution to start distribution bandwidth allocation strategy and cannot adapt to the network bandwidth fluctuation situation that the different nodes of Internet exist, and the appropriate piece that selects, select server, can more effectively be applied in actual Internet environment processing terminal request efficiently.

Additional aspect of the present invention and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.

Accompanying drawing explanation

Above-mentioned and/or additional aspect of the present invention and advantage accompanying drawing below combination obviously and is easily understood becoming the description of embodiment, wherein:

Fig. 1 is the distribution method flow chart of audio frequency and video mass data of the present invention in Distributor;

Fig. 2 is Data dissemination flow chart in the distribution method of audio frequency and video mass data of the present invention in Distributor;

Fig. 3 is the distribution method multicast flow chart of audio frequency and video mass data of the present invention in Distributor;

Fig. 4 is that the distribution method of audio frequency and video mass data of the present invention in Distributor used multicast schematic diagram;

Fig. 5 is the dissemination system schematic diagram of audio frequency and video mass data of the present invention in Distributor;

Fig. 6 is the distribution method general illustration of audio frequency and video mass data of the present invention in Distributor;

Fig. 7 is distribution method surge protection circuit, the overvoltage crowbar schematic diagram of audio frequency and video mass data of the present invention in Distributor;

Fig. 8 is the distribution method optocoupler step-down switch circuit schematic diagram of audio frequency and video mass data of the present invention in Distributor;

Fig. 9 is the distribution method external power source circuit diagram of audio frequency and video mass data of the present invention in Distributor;

Figure 10 is that the distribution method main power source of audio frequency and video mass data of the present invention in Distributor is for electrical schematic;

Figure 11 is the distribution method 3G power circuit schematic diagram of audio frequency and video mass data of the present invention in Distributor;

Figure 12 is the distribution method analog front circuit schematic diagram of audio frequency and video mass data of the present invention in Distributor;

Figure 13 is the distribution method cpu power circuit diagram of audio frequency and video mass data of the present invention in Distributor;

Figure 14 is the distribution method reset circuit schematic diagram of audio frequency and video mass data of the present invention in Distributor;

Figure 15 is the distribution method CAN bus communication circuit diagram of audio frequency and video mass data of the present invention in Distributor

Figure 16 is the distribution method CPU debugging and telecommunication circuit schematic diagram of audio frequency and video mass data of the present invention in Distributor;

Figure 17 is the distribution method CAN drive circuit schematic diagram of audio frequency and video mass data of the present invention in Distributor;

Figure 18 is the distribution method RS485 circuit diagram of audio frequency and video mass data of the present invention in Distributor;

Figure 19 is the distribution method RS232 circuit diagram of audio frequency and video mass data of the present invention in Distributor;

Figure 20 is the distribution method power protecting circuit schematic diagram of audio frequency and video mass data of the present invention in Distributor.

Embodiment

As shown in Figure 1, step 1, after mass data is received, be transferred to data source server, described data source server is divided into N data file fragmentation by described mass data, and each the data file burst in N data file fragmentation is separate, and described data source server is carried out Data dissemination by each data file burst separately, the Data dissemination of each data file burst, to destination node server, is arranged to N the Data dissemination optimised service bandwidth in data file fragmentation during distribution;

Step 2, arrange after N the Data dissemination optimised service bandwidth in data file fragmentation, described destination node server is divided into M data file fragmentation again for each the data file burst in N data file fragmentation, to being again divided into M data file fragmentation, carry out Data dissemination, be distributed to destination node child servers, until total data distribution is complete, described M, N are positive integer.

As shown in Figure 2, mass data distribution mechanisms of the present invention, in conjunction with the distributed flow media content delivering system of P2P technology and CDN technology, has better performance than homogeneous system.By improving the Data dissemination strategy of ServerCast, overcome the impact that its performance is subject to the fluctuation of the Internet network bandwidth, can further improve Data dissemination performance.

If first carry out coarseness before Data dissemination, cut apart, when Data Segmentation granularity is suitable, can be similar to and thinks in the distribution procedure of this data fragmentation, the access bandwidth of CDN server and load are approximate constant.The Data dissemination strategy that each cutting unit application ServerCast is proposed, when all cutting units all complete distribution, whole file completes distribution, and Data dissemination process finishes.

This improvement can adapt to the network bandwidth fluctuation of the upper destination node of Internet effectively, and dynamically adjusts and distribute to the distribution bandwidth of each destination node for network state in the same time not, thereby improves the performance of Data dissemination.

The optimised service bandwidth of Data dissemination is established B _savailable bandwidth for data source server; B _i(i=1,2...M) is the available bandwidth of M destination server; B _i,j(i=1,2 ... M, j=1,2 ... M, i ≠ j) be that collaborative distribution phase is by S _ito S _jduring forwarding data, be S _jthe distribution bandwidth of distributing.

The research of ServerCast is verified, as data source server S _stotal service bandwidth B _swith destination node mutually provide PSP data sharing service data retransmission total bandwidth difference hour, can obtain the highest Data dissemination performance, corresponding to the minimized Data dissemination deadline.Take this conclusion as basis, can prove data source server S _sto destination node S _kprovide the optimised service bandwidth of Data distributing to be:

$B_{s,k}=\frac{B_k}{M-1}+\frac{1}{M}\×\{B_s-\frac{1}{M-1}\×{\mathrm{\Σ}}_{i=1}^M{B}_i\}---\left(1\right).$

The collaborative mass data distribution mechanisms that the present invention proposes is divided into a plurality of incoherent independent distribution procedures mutually for different pieces of information burst by the distribution of a large file.Each distribution procedure independence executing data distribution decision-making, process is as follows:

(1) data file F to be distributed is divided into N burst FD _i(i=1,2..N).

(2) to each file fragmentation FD _i(i=1,2..N) carries out Data dissemination flow process below:

S1, data source server S _swith destination node S _ibetween exchange current available network bandwidth B _swith B _i(i=1,2..N), by data source server S _saccording to optimum distribution bandwidth allocation strategy (1), calculate this Data dissemination and distribute to each destination node S _idistribution bandwidth B _s,i.

S2, by data source server S _iby the current file fragmentation FD that will distribute _i(i=1,2..N) is further divided into M burst, is designated as FD _i,j, represent file fragmentation FD _ibe distributed to the secondary burst of destination node j, and its size meets following bounding algorithm:

$\left|{\mathrm{FD}}_{i,j}\right|=\left|{\mathrm{FD}}_i\right|\×\frac{B_{s,j}}{B_s}---\left(2\right)$

Namely to be allocated to each destination node S _jsecondary burst size be proportional to S _sdistribute to S _jdistribution bandwidth B _s,jaccount for S _ssuper-distribution bandwidth B _sratio.The object that is defined as follows constraint is to make each destination node S _jthe time that receives entire data is identical, to meet the constraint that obtains the shortest distribution time above.

S3, by data source server S _sby FD _ibe allocated to each destination node S _jsecondary

Burst FD _i,j(i=1,2...N, j=1,2...M) be the dispense rate B to calculate in step S1 concurrently _s,jsend to destination node S _j.

S4, as destination node S _jbeginning is from data source server S _swhile receiving data, start the synergistic data distribution mechanisms between destination node, to other M-1 node in system with data rate forward own to data source server S _sthe data that receive.The B' here _kbe different from the B in the initial distribution stage (1) _k, because from data source server S _swith other destination nodes S _jdata consumed certain bandwidth:

$B_k^{\′}=B_k-B_{s,k}-{\mathrm{\Σ}}_{\underset{i\≠k}{i=1}}^M\frac{B_k^{\′}}{M-1}---\left(3\right)$

(3) again perform step (2), until All Files burst FD _idistribute complete.

From description above, can find out, the algorithm that the present invention proposes is to be less data fragmentation by the large file division of magnanimity in essence, then each data fragmentation is used to ServerCast algorithm, thereby can be when distributing different data fragmentations, for Internet flow load situation at that time, dynamically adjust the distribution bandwidth that data source server is distributed to each destination node, overcome the destination node calculating before ServerCast algorithm is only used in the whole file data distribution procedure distribution to start distribution bandwidth allocation strategy and cannot adapt to the network bandwidth fluctuation situation that the different nodes of Internet exist, can more effectively be applied in actual Internet environment.

On the basis of above technology, for distribution efficiency and the performance between server, the solution of the ServerCast algorithm that the present invention has used multicasting technology to coordinate to improve.From Fig. 4, can see situation about using multicast, reduce well the load of server.

Multicasting technology utilizes an IP address to make IP datagram literary composition send to user's group.IP multicast has adopted specifically defined object IP address and target MAC (Media Access Control) address.IGMP group membership is related to that agreement provides the mode that adds and leave multicast group for client.It is switch configuration multicast forward table that CGMP makes router, and tells the multicast member that switch is current.Designed router (dr) is according to adopting dense mode DM or sparse mode SM multicast routing protocol to construct the distribution tree of multicast to the difference of the distribution of the multicast member in network and use, and this distribution tree will determine between source subnet and multicast group that a unique path is to improve data transmission efficiency, the English full name of CGMP is Cisco Group Management Protocol, is the proprietary protocol of Cisco based on model of client/server exploitation.

1.ServerCast algorithm is for Optimized Service bandwidth (Data dissemination)

2. multicasting technology has solved a main frame and to specific a plurality of recipients, has sent the method (request distribution) of message.

3. both is combined with, can say suitable the lacking of work that our server need to be done, substantially just play an effect that forwards intermediary or tissue, all allow as far as possible client oneself go to have processed actual work, network delay, loss of data etc. problem also solves thereupon.In multicast network, even if multicast user's quantity is doubled and redoubled, in backbone network, the network bandwidth is also without increase.Thereby solve to greatest extent the requirement of current broadband application to bandwidth and network service quality.

Distributor, when dispense request, is selected a server first at random.If the disposal ability of this server is saturated, traversal server bitmap from the beginning to the end, until find a suitable server.Make like this distribution of Distributor more random, be conducive to the P2P transmission between server, meanwhile, distribution procedure is relatively simple, can not increase the weight of the computational load of server.

As shown in Figure 3,4, multicast program execution flow is described:

Definition socket the machine input structure body, multicast address structure, receiving multicast message array etc., after basic variable has defined, create the socket for UDP communication, judges whether socket creates successfully, and successful continuation is carried out, otherwise quits a program; Then arrange to add multicast address, group address is set, the source master's who sends multicast message address information is set; The machine is added to multicast address, and the machine network interface card, as multicast member, only adds group just can receive multicast message; Judge that the machine adds multicast address whether successful, successful continuation is carried out, otherwise quits a program; Calculate the size of the machine input structure body, and offer for it the internal memory of corresponding size, the machine communication connected mode UDP and port are set; Bind oneself port and IP information to socket; Judge whether binding success, successful continuation is carried out, otherwise quits a program; Empty the array of receiving multicast message; After above preparation is all carried out, we just can circulate and receive the multicast message on network so, if do not received multicast message in circulation, complete, wherein UDP is towards disconnected agreement, it does not connect with the other side, but directly just Packet Generation is gone over.

IGMP agreement run on main frame and the multicast router that is directly connected with main frame between, main frame tells local router to wish to add and accept the information of certain particular multicast group by this agreement, the member that router is periodically inquired about certain known group in local area network (LAN) by this agreement simultaneously, whether in active state (whether this network segment still has the member who belongs to certain multicast group), realizes collection and the maintenance of the network group membership relation that networks.

IGMP has three versions, and IGMPv1 is defined by RFC1112, and that at present general is IGMPv2, by RFC2236, is defined.IGMPv3 remains a draft at present.In IGMPv1, defined basic group membership's inquiry and reporting process, IGMPv2 has added the mechanism that group membership leaves fast on this basis, and the major function increasing in IGMPv3 is that member can specify reception or specify the message that does not receive some multicast source.Here highlight the function of IGMPv2 agreement.

IGMPv2 elects unique requestor by requestor election mechanism for institute's networking section.Requestor periodically sends general group polling message and carries out member relation inquiry; Main frame sends report message and replys inquiry.In the time will adding multicast group, main frame needn't be waited for query messages, initiatively sends report message.In the time will leaving multicast group, main frame sends and leaves group message; Receive and leave after group message, requestor sends group-specific query message and determines whether that all group memberships leave.

By above-mentioned IGMP mechanism, in multicast router, set up list, wherein comprise each port of router and the member who has which group on the corresponding subnet of port.When router receives after the data message of certain group, only to those, there is forwarding data packets on member's the port of G.As for data message, between router, how to forward and determined by Routing Protocol, IGMP agreement is also not responsible.

As shown in Figure 5, comprising: camera device 1, satellite system 2, digital collection recorder 3, receiving system, Distributor 6, processing server 8, terminal installation;

Described camera device 1 connects digital acquisition and recording instrument 3, for the audio-visual data of collection being transferred to digital collection recorder 3 by camera device 1;

Described satellite system 2 connects digital acquisition and recording instrument 3, and for audio-visual data being sent to satellite system 2, and the transfer of data that satellite system 2 sends is to digital collection recorder 3;

Described digital collection recorder 3 connects receiving system, and described receiving system is for receiving the data of digital collection recorder 3 and the data of satellite system 2;

Described receiving system connects Distributor 6, described Distributor 6 connects processing server 8, for the audio-visual data that receiving system is received, by Distributor 6, send to processing server 8,8 pairs of audio-visual data of described processing server are processed;

Described processing server 8 connects terminal installation, for the audio-visual data after processing is sent to terminal installation, by terminal installation, data is applied and is processed and display operation.

Preferably, also comprise: fire compartment wall 5,

Described fire compartment wall 5 is connected between receiving system and Distributor, for tackling the malicious attack of audio-visual data.

Preferably, also comprise: SIP session initiation protocol service device 7;

Described SIP session initiation protocol service device is connected between fire compartment wall 5 and processing server 8, for audio-visual data is processed, SIP session initiation protocol service device is transplanted the free changing method of FreeSwitch, the free changing method of FreeSwitch supports the route of the agreement that audio frequency, video, text media data are used with mutual, the free changing method of FreeSwitch is realized audio frequency, video, text media data retransmission, makes to participate in completing between session person the transmission of audio frequency, video, text media data.

Preferably, described receiving system comprises: satellite receiver 4 and 3G/4G network base station;

Described satellite receiver 4 connects satellite system 2, and for receiving the transmission data of satellite system 2, described 3G/4G network base station connects digital acquisition and recording instrument 3, for transmission of audio video data.

Preferably, described terminal installation comprises: application server 9, database server 10 and terminal browser 11;

Application server plays the effect of resident web application, and application server provides the manageable access mechanism to system resource for web application,

Described application server 9 is connected respectively processing server 8 with database server 10, and described application server 9 information outputs connect terminal browser 11, for the data after processing are carried out to display operation.

Preferably, described satellite system comprises: gps system and dipper system;

Described gps system and dipper system are connected respectively to digital collection recorder 3 and satellite receiver 4, described digital collection recorder 3 sends to Distributor 6 by the audio-visual data of collection by gps system and dipper system, or the audio-visual data of collection is transferred to Distributor 6 by 3G/4G network base station, wherein time, longitude, the latitude information of the dipper system transmitting-receiving Big Dipper, and the transmitting-receiving of short message or the transmission of confidential information.

The realization of http protocol and database server connection management, Servlet container is only a part for application server.Except Servlet container, application server also may provide other Java EE (Enterprise Edition) assembly, as Enterprise Java Bean container, and JNDI server and JMS server etc.The application server that our company is used is at present the Tomcat of Apache.

The processing server here, the server that is exactly in fact processing terminal DVR and client browser requests asks Distributor distribution mechanisms to reside in this.

As shown in Figure 6, digital recorder comprises: multimedia processor, analog front circuit, DDR internal memory, power supply, power protecting circuit, Big Dipper module, 3G module, audio frequency and video input circuit, telecommunication circuit;

Described power output end connects power protecting circuit input, described power protecting circuit output connects multimedia processor input, described DDR memory information output, connect multimedia processor information input terminal, described Big Dipper module by signal output connects multimedia processor input, described audio frequency and video input circuit signal input part connecting analog front-end circuit signal input part, described analog front circuit signal output part connects multimedia processor input, described 3G module by signal output connects multimedia processor input, described telecommunication circuit connects multimedia processor input.

The beneficial effect of technique scheme is: multimedia processor, analog front circuit, DDR internal memory, power supply, power protecting circuit, Big Dipper module, 3G module, audio frequency and video input circuit; the combination of telecommunication circuit; realized the acquisition and recording of digital audio video data, made the compression transmission of mass data become possibility.

As shown in Figure 7, preferred, described power protecting circuit comprises: external power source circuit, surge protection circuit, overvoltage crowbar;

Surge protection circuit output connects overvoltage crowbar input, and described overvoltage crowbar output connects main power circuit input, and described overvoltage crowbar output also connects external power source circuit input end.

The beneficial effect of technique scheme is: the surge that it is perfect, over-voltage over-current protection, the highest withstand voltage 200V.

The described digital record processing unit for audio frequency and video mass data, preferred, described surge protection circuit comprises:

External power source connects the 1st resettable fuse; described the 1st resettable fuse connects the 1st Transient Suppression Diode one end; described the 1st Transient Suppression Diode other end connects respectively the 6th diode cathode and the 2nd Transient Suppression Diode one end; described the 6th diode cathode ground connection; described the 2nd Transient Suppression Diode other end ground connection; described the 2nd Transient Suppression Diode one end also connects the 8th inductance one end; described the 8th inductance other end connects respectively the 159th electric capacity one end and overvoltage crowbar input, the 159th electric capacity other end ground connection.

The beneficial effect of technique scheme is: surge protection circuit has been realized surge protection.

Preferably, described overvoltage crowbar comprises:

The 21st resistance one end connects the 4th emitter, described the 21st resistance other end connects respectively the 4th transistor base and the 40th resistance one end, described the 4th transistor collector connects respectively the 4th diode cathode and the 156th electric capacity one end, described the 156th electric capacity one end also connects the 157th electric capacity one end, described the 156th electric capacity other end connects the 40th resistance, described the 157th electric capacity other end connects respectively the 40th resistance one end and the 5th transistor collector, described the 5th emitter connects the 122nd resistance one end, described the 122nd resistance other end ground connection, described the 5th transistor base connects respectively the 125th resistance one end and the 126th resistance one end, described the 125th resistance other end connects the 122nd resistance one end, described 126 resistance other end ground connection, described the 126th resistance one end also connects the 5th diode cathode, described the 5th diode cathode connects the 14th emitter, described the 14th emitter also connects the 15th footpath emitter, described the 15th transistor collector connects respectively the 4th diode cathode and the 14th transistor collector, described the 14th transistor base connects the 139th resistance one end, described the 139th resistance other end ground connection.

The beneficial effect of technique scheme is: overvoltage crowbar is realized overvoltage protection, and its circuit connects unique, and cost is low, stable.

As shown in Figure 9, preferred, described external power source circuit comprises:

The voltage input end of the 17th optocoupler step-down switch connects respectively overvoltage crowbar output and the 311st electric capacity one end, the 311st electric capacity other end ground connection, the SW end of described the 17th optocoupler step-down switch connects respectively the 28th diode cathode and the 299th electric capacity one end, the 28th diode cathode ground connection, the 299th electric capacity other end connects respectively BST end the 29th diode cathode of described the 17th optocoupler step-down switch, the SS end of described the 17th optocoupler step-down switch connects the 298th electric capacity one end, the 298th electric capacity other end ground connection, described the 299th electric capacity one end also connects the 11st inductance one end, the 11st inductance other end connects the 167th resistance one end, the 167th resistance other end connects the 160th resistance one end, the 160th resistance other end ground connection, the FB end of described the 17th optocoupler step-down switch connects respectively the 161st resistance, the 162nd resistance and the 163rd resistance one end, described the 161st resistance other end ground connection, described the 162nd resistance other end connects the 297th electric capacity one end, described the 297th electric capacity other end connects the 163rd resistance one end, the 163rd resistance other end connects the 161st resistance one end, described the 297th electric capacity one end also connects voltage output end, described the 167th resistance one end also connects respectively the 245th electric capacity one end and the 30th diode cathode, described the 30th diode cathode connects the 7th Transient Suppression Diode one end, the 7th Transient Suppression Diode other end connects the 315th electric capacity, described the 315th electric capacity other end ground connection, described the 315th electric capacity one end also connects the 317th electric capacity one end, described the 317th electric capacity other end ground connection, described the 245th electric capacity one end also connects the 3rd Transient Suppression Diode, the 4th Transient Suppression Diode, the 5th Transient Suppression Diode and the 6th Transient Suppression Diode one end, described the 3rd Transient Suppression Diode, the 4th Transient Suppression Diode, the 5th Transient Suppression Diode is connected load (J30) with the 6th Transient Suppression Diode other end, described the 245th diode also connects the 314th electric capacity one end, described the 314th electric capacity other end ground connection, described the 314th electric capacity one end also connects respectively the 15th Transient Suppression Diode, the 16th Transient Suppression Diode, the 17th Transient Suppression Diode and the 18th Transient Suppression Diode one end, described the 15th Transient Suppression Diode, the 16th Transient Suppression Diode, the 17th Transient Suppression Diode is connected voltage output end with the 18th Transient Suppression Diode other end.

The beneficial effect of technique scheme is: power circuit is for carrying out stable Power supply to digital recorder.

As shown in figure 12, preferred, described analog front circuit comprises:

The 143rd electric capacity one end connects the 147th electric capacity one end, described the 143rd electric capacity other end connects 3.3V power supply and the 147th electric capacity other end, described the 147th electric capacity other end connects the 23rd optocoupler step-down switch voltage input end, described the 23rd optocoupler step-down switch voltage output end connects the 144th electric capacity one end, the 144th electric capacity other end ground connection, described the 144th electric capacity one end also connects the 145th electric capacity one end, described the 145th electric capacity other end ground connection, described the 145th electric capacity one end also connects respectively the 36th resettable fuse and the 146th electric capacity one end, described the 146th electric capacity other end ground connection, described the 146th electric capacity one end also connects the 148th electric capacity one end, the 148th electric capacity other end ground connection.

The beneficial effect of technique scheme is: analog front circuit carries out early stage to audio-visual data data to be processed, and is then transferred to multimedia processor and carries out corresponding data processing.

As shown in figure 14, preferred, also comprise: reset circuit;

The 38th resistance one end connects the 49th resistance one end, the 49th resistance other end connects 3.3V voltage source, the 38th resistance one end also connects reset chip voltage input end, reset chip is reset to hold and is connected the 24th resistance and the 72nd resistance one end, described the 24th resistance other end connects the 187th electric capacity, the 187th electric capacity other end connects the 72nd resistance other end, the 72nd resistance other end ground connection.

The beneficial effect of technique scheme is: the work that reset circuit is restarted and resetted for digital recorder.

As shown in figure 15, preferred, described telecommunication circuit comprises:

CAN bus circuit voltage input end connects 3.3V voltage source and the 86th electric capacity one end, the nINT end of CAN bus circuit connects the 32nd resistance one end, described the 32nd resistance other end connects voltage source, the crystal oscillator input of described CAN bus circuit connects the 3rd crystal oscillator one end, described the 3rd crystal oscillator other end connects the crystal oscillator output of described CAN bus circuit, described the 3rd crystal oscillator one end also connects the 87th electric capacity one end, and the 3rd crystal oscillator other end also connects the 88th electric capacity one end.

The beneficial effect of technique scheme is: described telecommunication circuit is carried out the transmission work of data, and simplicity of design is reasonable.

As shown in figure 17, preferred, described telecommunication circuit comprises:

CAN bus circuit output connects CAN drive circuit input, described CAN drive circuit high level end connects the 44th resistance one end, the 44th resistance other end connects the 1st magnetic bead inductance one end, the 1st magnetic bead inductance other end connects the 19th diode cathode, described the 19th diode cathode ground connection, described CAN drive circuit low level end connects the 45th resistance one end, the 45th resistance other end connects the 2nd magnetic bead inductance one end, the 2nd magnetic bead inductance other end connects the 11st diode cathode, the 11st diode cathode ground connection.

The beneficial effect of technique scheme is: described telecommunication circuit is carried out the transmission work of data, and simplicity of design is reasonable.

As shown in figure 18, preferred, described telecommunication circuit comprises:

The R0 end of RS485 chip connects the 155th resistance one end, the 155th resistance other end connects CPU debugging and holds with the UART1_RXD of communication interface, the DE end of described RS485 chip connects the 152nd resistance one end, the DI end of described RS485 chip connects the 151st resistance one end, the B end of described RS485 chip connects the 183rd resistance one end, described the 183rd resistance other end connects the 27th resistance one end, described the 27th resistance other end connects the 182nd resistance one end, described the 182nd resistance other end connects the A end of RS485, described the 183rd resistance other end connects the 37th diode cathode, described the 37th diode cathode ground connection, 38 diode cathodes that described the 182nd resistance other end connects, described the 38th diode cathode ground connection,

As shown in figure 19, RS232 chip voltage input connects the 81st electric capacity one end, the 81st electric capacity other end connects the 80th electric capacity one end and the 82nd electric capacity one end, described the 80th electric capacity other end connects the positive polarity of RS232 chip, described the 81st electric capacity other end also connects the voltage negative pole of RS232 chip, the input of described RS232 chip connects CPU debugging to be held with the UART3_TXD of communication interface, and the output of described RS232 chip connects the 36th diode cathode, described the 36th diode cathode ground connection.

The beneficial effect of technique scheme is: the use of RS485 and RS232 chip circuit, has realized the stable of communication work.

As shown in Figure 8, optocoupler step-down switch U16 voltage input end connects overvoltage crowbar output, optocoupler step-down switch U16 Enable Pin connects respectively the 310th electric capacity and external power source circuit input end, the SW end of described optocoupler step-down switch U16 connects the 9th diode cathode, the 9th diode cathode ground connection, described the 9th diode cathode also connects the 239th electric capacity one end, the 239th electric capacity other end connects respectively BST end and the 31st diode cathode of optocoupler step-down switch U16, the 31st diode cathode connects the 10th inductance one end, the 10th inductance other end connects the 239th electric capacity one end, described the 10th inductance one end also connects the 140th resistance one end, described the 140th resistance other end connects the VO end of optocoupler step-down switch U16, described the 140th resistance other end also connects the 143rd resistance one end, described the 143rd resistance other end ground connection, described the 10th inductance one end also connect the 244th electric capacity one end and 153 resistance one end, described the 244th electric capacity other end connects the 154th resistance one end, described the 154th resistance other end connects the 144th resistance one end, the 144th resistance other end ground connection, described the 144th resistance one end also connects the FB end of optocoupler step-down switch U16, 240 electric capacity one end that described the 10th inductance one end also connects, the 240th electric capacity other end ground connection, described the 240th electric capacity one end also connects the 308th electric capacity one end, the 308th electric capacity other end ground connection, described the 308th electric capacity one end connects the 312nd electric capacity one end, described the 312nd electric capacity other end ground connection, described the 312nd electric capacity one end also connects the 10th diode cathode, the 10th diode cathode connects the 25th diode cathode, the 25th diode cathode also connects respectively the 243rd electric capacity one end and the 313rd electric capacity one end, the 243rd electric capacity other end and the 313rd electric capacity other end be ground connection respectively.

As shown in figure 10, when main power source is powered, the circuit adopting is that the 325th electric capacity one end connects the 328th electric capacity one end, the 325th electric capacity other end ground connection, described the 328th electric capacity other end ground connection, described the 328th electric capacity one end also connects optocoupler step-down switch U18 input, the BST end of described optocoupler step-down switch U18 connects the 326th electric capacity one end, described the 326th electric capacity other end connects respectively SW end and the 13rd inductance one end of optocoupler step-down switch U18, the 13rd inductance other end connects the 23rd resistance one end, the FB end of described optocoupler step-down switch U18 connects the 207th resistance one end, the 207th resistance other end connects respectively the 23rd resistance other end and the 48th resistance one end, described the 48th resistance other end ground connection, the 13 described inductance other ends connect the 49th resettable fuse (TP49), described the 32nd electric capacity, the 261st electric capacity is connected 3.3V out-put supply with one end after the 191st Capacitance parallel connection, other end ground connection.

As shown in figure 11, when 3G power supply is powered, the circuit adopting is that the 331st electric capacity one end connects the 333rd electric capacity one end, the 331st electric capacity other end ground connection, described the 333rd electric capacity other end ground connection, described the 333rd electric capacity one end also connects optocoupler step-down switch U21 input, the BST end of described optocoupler step-down switch U21 connects the 332nd electric capacity one end, described the 332nd electric capacity other end connects respectively SW end and the 15th inductance one end of optocoupler step-down switch U21, the 15th inductance other end connects the 26th resistance one end, the FB end of described optocoupler step-down switch U21 connects the 209th resistance one end, the 209th resistance other end connects respectively the 26th resistance other end and the 55th resistance one end, described the 55th resistance other end ground connection, the 15 described inductance other ends connect the 51st resettable fuse (TP51), described the 33rd electric capacity, the 262nd electric capacity is connected the 3G out-put supply of 3.3V with one end after the 193rd Capacitance parallel connection, other end ground connection.

As shown in figure 13, cpu power circuit adopts HI3520D chip, the 164th electric capacity is connected the AVDD33_PLL end of cpu power circuit with one end after the 47th Capacitance parallel connection, other end connecting circuit LB10 the 2nd end, described LB10 the 1st end connects 3.3VSoC, the 163rd electric capacity is connected the AVDD12_PLL end of cpu power circuit with one end after the 46th Capacitance parallel connection, other end connecting circuit LB11 the 2nd end, and described LB11 circuit the 1st end connects 1.25VSoC.

As shown in figure 16, the 180th electric capacity one end connects the 2nd crystal oscillator one end, described the 180th electric capacity other end ground connection, described the 179th electric capacity one end connects the 2nd crystal oscillator other end, the 179th electric capacity other end ground connection, described the 2nd crystal oscillator one end also connects the 36th resistance one end, the 2nd crystal oscillator other end also connects the 186th resistance one end, the 186th resistance other end connects the 36th resistance other end, described the 36th resistance one end also connects the X input of CPU communication and debugging interface, described the 36th resistance other end also connects the X output of CPU communication and debugging interface, the 152nd electric capacity one end connects the calibration input of CPU communication and debugging interface, described the 152nd electric capacity other end ground connection, described the 152nd one end also connects the 1st crystal oscillator one end, the 1st crystal oscillator other end connects the 153rd electric capacity one end, the 153rd electric capacity other end ground connection, described the 153rd electric capacity one end also connects the calibration output of CPU communication and debugging interface.

1, power unit, due to vehicle power complex, has designed respectively surge circuit, overvoltage protection, and overcurrent protection, the highest withstand voltage 200V of power unit,

2, processor part, adopts ARM Cortex A9 processor, Baseline/Main/High Profile Level4.2 codec H.264, and 128MB DDR3 internal memory, SATA hard-disk interface, is used for compressing analog video and the storage on 4 tunnels.

3, analog video revolution word processor part, adopts the up-to-date video AD C of NVP1918, real-time 4 road videos, and 4 road audio frequency, are converted to digital signal transfers and compress to processor.

4,3G network part, adopts the WCDMA of general PCIE interface, CDMA2000, and TDSWCDMA, wireless module, is connected with processor by USB interface.

5, the Big Dipper/gps partly adopts the Big Dipper, GPS, and two-in-one module, is connected with processor by serial ports

6, input/output section, with processor is connected after isolating by photoelectricity.

Power protecting circuit also comprises that stand-by power supply charging module is preferably used SX5202, and the 5V out-put supply module of stand-by power supply is preferably TRI1461GB05.External power module preferably adopts MP24943.

DDR3 internal memory is preferably MT41J64M16LA-15E, SPI program storage is preferably MX25L12835F, system reset circuit preferably adopts ADM809, RS485 bus is preferably MAX3485E, RS232 bus is preferably SP3232E, the preferred HI3520D of CPU AFE (analog front end) input interface, 3G module is preferably MC2716, CAN bus is preferably MCP2515, CAN drives and is preferably SN65HVD230, and SIM card interface is preferably 254020MA006S500ZL, and GPS module is preferably gps1216, reset circuit is ADM809, and multimedia processor interface chip is HI3520D; Warning circuit is preferably FDS9958, ULN2003A chip forms.

As shown in figure 20, described power protecting circuit also comprises: power charging circuit and stand-by power supply circuit, described power charging circuit output connects stand-by power supply circuit input end, described power charging circuit comprises: integrated circuit J31 connects resettable fuse TP46, the described resettable fuse TP46 other end connects the 169th resistance one end, described the 169th resistance one end also connects optocoupler step-down switch U11 input, described optocoupler step-down switch U11 input also connects the 323rd electric capacity one end, described the 323rd electric capacity other end ground connection, described optocoupler step-down switch U11BST end connects the 320th electric capacity one end, described the 320th electric capacity other end connects respectively SW end and the 12nd inductance one end of optocoupler step-down switch U11, described the 12nd inductance other end connects resettable fuse TP4, described the 12nd inductance other end also connects the 203rd resistance one end, described the 203rd resistance other end connects respectively the 202nd resistance one end and the 204th resistance one end, described the 202nd resistance other end ground connection, described the 204th resistance other end connects the FB end of optocoupler step-down switch U11, described resettable fuse TP4 also connects the 321st electric capacity and the 322nd electric capacity one end, described the 321st electric capacity and the 322nd electric capacity other end ground connection,

Described the 169th resistance other end connects respectively the 9th inductance one end and the 318th electric capacity one end, described the 318th electric capacity other end ground connection, described the 9th inductance other end connects respectively SW end and the 8th diode cathode of charging chip SX5202, described the 8th diode cathode ground connection, the FB end of described charging chip SX5202 connects the 319th electric capacity, the TS end of described charging chip SX5202 connects the 168th resistance one end, described the 168th resistance other end ground connection.

Advantage, 1, perfect surge, over-voltage over-current protection, the highest withstand voltage 200V; 2, H.246 high compression ratio compression.3, large capacity DDR3 internal memory.4, flush type LINUX system, protection system is not subject to virus, network attack.5, high speed 3G network, real-time video transmission.Big Dipper module, 3G module, be all to identify input by existing chip;

Although illustrated and described embodiments of the invention, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present invention and aim, can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claim and equivalent thereof.

Claims (5)

1. the distribution method of audio frequency and video mass data in Distributor, is characterized in that, comprises the steps:

Step 1, after mass data is received, be transferred to data source server, described data source server is divided into N data file fragmentation by described mass data, each data file burst in N data file fragmentation is separate, described data source server is carried out Data dissemination by each data file burst separately, and the Data dissemination of each data file burst, to destination node server, is arranged to N the Data dissemination optimised service bandwidth in data file fragmentation during distribution;

Step 2, arrange after N the Data dissemination optimised service bandwidth in data file fragmentation, described destination node server is divided into M data file fragmentation again for each the data file burst in N data file fragmentation, to being again divided into M data file fragmentation, carry out Data dissemination, be distributed to destination node child servers, until total data distribution is complete, described M, N are positive integer.

2. the distribution method of audio frequency and video mass data according to claim 1 in Distributor, is characterized in that, described step 1 comprises:

Step 1-1, making each the data file burst in described N data file fragmentation is FD _i, described subscript i is positive integer;

Step 1-2, data source server S _swith destination node server S _ibetween exchange current available data source server network bandwidth B _swith destination node server network bandwidth B _i, described subscript s is data source server label,

Step 1-3, establishes data source server network bandwidth B _savailable bandwidth for data source server; B _iavailable bandwidth for N destination node server; B _i,jthat collaborative distribution phase is by S _ito S _jduring forwarding data, be S _jdistribution bandwidth i ≠ the j distributing, described subscript i, j are positive integer;

Step 1-4, data source server network bandwidth B _swith destination node network bandwidth B _imutually provide PSP data sharing service data retransmission total bandwidth difference hour, obtain the highest Data dissemination performance, corresponding to the minimized Data dissemination deadline, so data source server S _sto destination node server S _kprovide the optimised service bandwidth of Data distributing to be, described subscript k is a destination node server,

$B_{s,k}=\frac{B_k}{M-1}+\frac{1}{M}\×\{B_s-\frac{1}{M-1}\×{\mathrm{\Σ}}_{i=1}^M{B}_i\};$

Step 1-5, calculates this Data dissemination and distributes to each destination node server S _idistribution bandwidth B _s,i.

3. the distribution method of audio frequency and video mass data according to claim 1 in Distributor, is characterized in that, described step 2 comprises:

Step 2-1, by data source server S _iby current each data file burst FD that will distribute _ifurther be divided into M burst, be designated as FD _i,j, it represents file fragmentation FD _ibe distributed to the secondary burst of destination node child servers j, and its size meets following formula,

$\left|{\mathrm{FD}}_{i,j}\right|=\left|{\mathrm{FD}}_i\right|\×\frac{B_{s,j}}{B_s},$

Be allocated to each destination node child servers S _jsecondary burst size, be data source server S _sdistribute to destination node child servers S _jdistribution bandwidth B _s,jwith S _ssuper-distribution bandwidth B _svalue be directly proportional, make each destination node child servers S _jthe time that receives entire data is identical.

Step 2-2, by data source server S _sby each data file burst FD _ibe allocated to each destination node child servers S _jsecondary burst FD _i,j, the parallel destination node distribution bandwidth B calculating in step 2-1 _s,jsend to destination node child servers S _j;

Step 2-3, as destination node child servers S _jbeginning is from data source server S _swhile receiving data, start the synergistic data distribution mechanisms between destination node, to other M-1 node in destination node child servers with data rate forward own to data source server S _sthe data that receive; Described B' _krefer to data source server S _swith destination node child servers S _jthe bandwidth that consumed of data, that is,

$B_k^{\′}=B_k-B_{s,k}-{\mathrm{\Σ}}_{\underset{i\≠k}{i=1}}^M\frac{B_k^{\′}}{M-1}.$

4. the distribution method of audio frequency and video mass data according to claim 1 in Distributor, is characterized in that, also comprises:

N data file fragmentation carried out to random chip select and send to destination node server, and connect with terminal, then, multicast address is set terminal is joined in multicast address, receive and send multicast message, making the service efficiency of data source server and destination node server higher.

5. the distribution method of audio frequency and video mass data according to claim 4 in Distributor, is characterized in that, comprising:

S1, definition basic variable, comprises terminal Socket input structure body, multicast address structure and receiving multicast message array;

S2, creates the socket for network service, and socket communication modes is made as to UDP, judges whether terminal socket creates successfully, and successful continuation is carried out, otherwise quits a program;

S3, setting to add terminal multicast address, data source server or destination node server group address are set, the terminal address information that sends multicast message are set;

S4, adds multicast address terminal, and terminal network interface card, as multicast member, only adds data source server or destination node server group just can receive multicast message; Judge that terminal adds multicast address whether successful, successful continuation is carried out, otherwise quits a program;

S5, calculates the size of the machine input structure body, and offers for it the internal memory of corresponding size, and terminal called connected mode UDP and port are set;

S6, binding data source server or destination node Service-Port and IP information are to terminal socket; Judge whether binding success, successful continuation is carried out, otherwise quits a program;

S7, empties the array of receiving terminal multicast message, and circulation receiving terminal multicast message is if do not receive multicast message in circulation, complete.