CN1501713A - Digital television front end server clock synchronizing method - Google Patents
Digital television front end server clock synchronizing method Download PDFInfo
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- CN1501713A CN1501713A CNA021492956A CN02149295A CN1501713A CN 1501713 A CN1501713 A CN 1501713A CN A021492956 A CNA021492956 A CN A021492956A CN 02149295 A CN02149295 A CN 02149295A CN 1501713 A CN1501713 A CN 1501713A
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Abstract
The invention discloses a digital television front end server clock synchronizing method comprising, using one computer in the digital television broadcasting system as a synchronization server, using the other computers in the digital television broadcasting system as a client end, the other computer clock using the clock synchronization server as clock reference for keeping synchronization with the clock synchronization server. The advantages of the invention are good expanding property and low cost.
Description
Technical field:
The present invention relates to a kind ofly utilize local area network (LAN) to carry out the method for clock synchronization, particularly relate to a kind of digital TV front-end server clock synchronizing method at digital TV field.
Background technology:
Carrying out along with the television headend digital improvement, have the broadcast system that increasing computer server equipment enters into Digital Television, and the broadcast of Digital Television is closely-related with the time, this just requires the broadcast of Digital Television and the clock in the computer system to keep could finishing the broadcast of Digital Television smoothly synchronously.
Traditional TV broadcasts headend equipment and adopts special-purpose hardware device to guarantee the synchronous of clock, and this method is not suitable for the computer equipment of digital TV front-end, and its reason is as follows:
The one, realize that clock synchronization needs special-purpose hardware and corresponding software, causes cost higher; The 2nd, autgmentability is poor, and computer of every increase will be installed relevant hardware equipment, and be not suitable for mobile computer device, as notebook computer etc.
At above the deficiencies in the prior art, be necessary to develop a kind of clock synchronization that is suitable for the system that broadcasts based on the Digital Television that adopts Local Area Network to connect.
Summary of the invention:
The technical problem to be solved in the present invention is to propose a kind ofly to utilize local area network (LAN) to carry out the method for clock synchronization in Digital Television broadcast system.
A kind of digital TV front-end server clock synchronizing method of the present invention comprises the steps:
Step 1: with a certain computer in the Digital Television broadcast system as clock synchronization server (Server);
Step 2: all the other computers in the Digital Television broadcast system all are set to client (Client);
Step 3: except that clock synchronization server (Server), other computer clocks are benchmark with the clock of clock synchronization server all, keep synchronous with it in the Digital Television broadcast system.
The method of the clock synchronization of clockwork is following steps in the clock of described clock synchronization server and the broadcast system:
Step 10: the clock synchronization card of a special use is inserted in the clock synchronization server;
Step 11: will carry the vision signal of a certain TV station of time-base signal in the flyback as the input signal of described clock synchronization card;
Step 12: the clock synchronization server is obtained this time-base signal by corresponding software, and the clock of check and correction clock synchronization server, makes clock synchronization.
After system start-up, intercept the clock synchronization solicited message of clock synchronization client at the clock synchronization server of described step 1 all the time, obtain immediately this machine clock information to be sent to the requestor after the clock synchronization solicited message.
Other computer clocks in described step 3 are benchmark with the server clock all, comprising:
Step 30: start synchro timer T1;
Step 31: start overtime timer T2;
Step 32: to clock synchronization server tranmitting data register synchronization request;
Step 33: the clock information of receive clock synchronization server;
Step 34:, this machine clock is set according to the clock information of institute's receive clock synchronization server.
Behind the clock information of the above receive clock synchronization server, also comprise: judge whether overtime timer T2 arrives the time of setting, if then, then removes synchro timer T2, restarts synchro timer T2; If not then, then carry out next step, promptly this machine clock is set according to the clock information that receives.
Above-mentioned this machine clock step is set after, also comprise and judge whether synchro timer T1 arrives the time of setting, if then, then removes synchro timer T1, restarts synchro timer T1; If not then, rejudge after then waiting for.
The setting-up time of described overtime timer T2 is 50-100ms.
Realize clock synchronization based on the software mode of local area network (LAN) ICP/IP protocol between the method for the invention employing clock synchronization server and client side, the clock synchronization server software is installed, the clock synchronization client software is installed in client at the clock synchronization server.The present invention has favorable expandability, the advantage that cost is low.Use the present invention need not add any hardware device, and be particularly suitable for mobile computer device such as notebook computer.
Description of drawings:
Fig. 1 is a clock synchronization server end flow chart of the present invention;
Fig. 2 is a clock synchronization client flow chart of the present invention;
Fig. 3 is one embodiment of the invention digital TV front-end system configuration schematic diagram.
Embodiment:
The method of the invention adopts server/customer end (Server/Client) structure, with a certain computer in the Digital Television broadcast system as clock server (Server), all as client (Client), the method for the clock synchronization of clockwork is other computers in the clock of clock synchronization server and the broadcast system:
Adopt the clock synchronization card of a special use to be inserted in the clock synchronization server, the input signal of this clock synchronization card is the vision signal that carries a certain TV station of time-base signal in the flyback, the clock synchronization server obtains described time-base signal by corresponding software, and the clock of check and correction clock synchronization server, make clock synchronization.
Except that clock server (Server), other computer clocks are benchmark with the server clock all, keep synchronous with it in the Digital Television broadcast system.The clock synchronization of clock server and client adopts based on the software mode of local area network (LAN) ICP/IP protocol and realizes in the method for the invention, at clock server the clock synchronization server software is installed, and in client the clock synchronization client software is installed.Clock synchronization server software and clock synchronization client software carry out communication by the local area network (LAN) ICP/IP protocol and realize clock synchronization.
The operation principle of described clock synchronization server is shown in the program flow diagram of Fig. 1.After the system start-up, program is in running status all the time, intercepts the clock synchronization solicited message of clock synchronization client all the time, obtains immediately this machine clock information to be sent to the requestor after the clock synchronization solicited message.
The program circuit of clock synchronization client as shown in Figure 2, its basic procedure is:
Step 30: start synchro timer T1;
Step 31: start overtime timer T2;
Step 32: to clock synchronization server tranmitting data register synchronization request;
Step 33: the clock information of receive clock synchronization server;
Step 34:, this machine clock is set according to the clock information of institute's receive clock synchronization server.
Consider the non real-time of ICP/IP protocol, the present invention has adopted overtime invalid method to guarantee the validity of the clock information that receives.T2 is an overtime timer among Fig. 2, can be decided to be 50-100ms, when transmiting a request to the time-delay that receives clock information and surpass this value, thinks that then the clock information that receives is invalid, abandon need not, resend the clock synchronization request.Timer T1 is timer synchronizing cycle among Fig. 2, can set as required.
Fig. 3 is the computer equipment schematic diagram of simple numerical television headend system, among this Fig. 3, include quasi-video request program (Near Video On Demand is called for short NVOD) Broadcast Control computer 30, webmaster computer 31, video server 32, NVOD Promgramming computer 33, safe operational constraints (SafeOperating Limit, be called for short SOL) server 34, electronic program guides editor computer 35, electronic program guides broadcasts computer 36, and they carry out communication by Ethernet.In the present embodiment, adopt NVOD Broadcast Control server, clock synchronization server software as shown in Figure 1 is installed as the clock synchronization server, other computers 31-36, as client, and installation clock synchronization client software as shown in Figure 2.
In this example, will be made as synchronizing cycle 1 hour.When starting working, start timer T1 synchronizing cycle, through long-play, each computer clock can remain unanimity.
It should be noted last that, above embodiment is only unrestricted in order to explanation the present invention, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the present invention, and not breaking away from the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (7)
1, a kind of digital TV front-end server clock synchronizing method is characterized in that: comprise the steps:
Step 1: with a certain computer in the Digital Television broadcast system as clock synchronization server (Server);
Step 2: all the other computers in the Digital Television broadcast system all are set to client (Client);
Step 3: except that clock synchronization server (Server), other computer clocks are benchmark with the clock of clock synchronization server all, keep synchronous with it in the Digital Television broadcast system.
2, digital TV front-end server clock synchronizing method according to claim 1 is characterized in that: the method for the clock synchronization of clockwork is following steps in the clock of described clock synchronization server and the broadcast system:
Step 10: the clock synchronization card of a special use is inserted in the clock synchronization server;
Step 11: will carry the vision signal of a certain TV station of time-base signal in the flyback as the input signal of described clock synchronization card;
Step 12: the clock synchronization server is obtained this time-base signal by corresponding software, and the clock of check and correction clock synchronization server, makes clock synchronization.
3, digital TV front-end server clock synchronizing method according to claim 1 and 2, it is characterized in that: described clock synchronization server is after system start-up, all the time intercept the clock synchronization solicited message of clock synchronization client, obtain immediately this machine clock information to be sent to the requestor after the clock synchronization solicited message.
4, digital TV front-end server clock synchronizing method according to claim 1 is characterized in that: described all the other computer clocks are benchmark with the server clock all, comprising:
Step 30: start synchro timer T1;
Step 31: start overtime timer T2;
Step 32: to clock synchronization server tranmitting data register synchronization request;
Step 33: the clock information of receive clock synchronization server;
Step 34:, this machine clock is set according to the clock information of institute's receive clock synchronization server.
5, digital TV front-end server clock synchronizing method according to claim 4, it is characterized in that: after the clock information step of described receive clock synchronization server, also comprise: judge whether overtime timer T2 arrives the time of setting, if then, then remove synchro timer T2, restart synchro timer T2; If do not arrive, then carry out next step.
6, digital TV front-end server clock synchronizing method according to claim 4, it is characterized in that: described this machine clock is set after, also comprise: judge whether synchro timer T1 arrives setting-up time, if then, then remove synchro timer T1, restart synchro timer T1; If not then, rejudge after then waiting for.
7, digital TV front-end server clock synchronizing method according to claim 4 is characterized in that: the setting-up time of described overtime timer T2 is 50-100ms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021492956A CN1501713A (en) | 2002-11-12 | 2002-11-12 | Digital television front end server clock synchronizing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021492956A CN1501713A (en) | 2002-11-12 | 2002-11-12 | Digital television front end server clock synchronizing method |
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| CN1501713A true CN1501713A (en) | 2004-06-02 |
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| CNA021492956A Pending CN1501713A (en) | 2002-11-12 | 2002-11-12 | Digital television front end server clock synchronizing method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010020120A1 (en) * | 2008-08-20 | 2010-02-25 | 华为技术有限公司 | Method, device and system for synchronizing time |
| WO2010022650A1 (en) * | 2008-08-29 | 2010-03-04 | 华为技术有限公司 | Clock synchronization method, device and system |
| CN102694960A (en) * | 2012-06-08 | 2012-09-26 | 深圳路迪网络有限公司 | Device for synchronously controlling video output signal |
| CN103945237A (en) * | 2014-04-23 | 2014-07-23 | 海信集团有限公司 | Clock synchronization method and system, digital television equipment and EPG server |
| CN105812854A (en) * | 2014-12-30 | 2016-07-27 | Tcl集团股份有限公司 | Advertisement playing control method and device thereof |
-
2002
- 2002-11-12 CN CNA021492956A patent/CN1501713A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010020120A1 (en) * | 2008-08-20 | 2010-02-25 | 华为技术有限公司 | Method, device and system for synchronizing time |
| WO2010022650A1 (en) * | 2008-08-29 | 2010-03-04 | 华为技术有限公司 | Clock synchronization method, device and system |
| CN102694960A (en) * | 2012-06-08 | 2012-09-26 | 深圳路迪网络有限公司 | Device for synchronously controlling video output signal |
| CN103945237A (en) * | 2014-04-23 | 2014-07-23 | 海信集团有限公司 | Clock synchronization method and system, digital television equipment and EPG server |
| CN105812854A (en) * | 2014-12-30 | 2016-07-27 | Tcl集团股份有限公司 | Advertisement playing control method and device thereof |
| CN105812854B (en) * | 2014-12-30 | 2019-07-19 | Tcl集团股份有限公司 | A kind of control method and device that advertisement plays |
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