CN100364318C - A video signal accurate control method - Google Patents
A video signal accurate control method Download PDFInfo
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- CN100364318C CN100364318C CNB2005100632572A CN200510063257A CN100364318C CN 100364318 C CN100364318 C CN 100364318C CN B2005100632572 A CNB2005100632572 A CN B2005100632572A CN 200510063257 A CN200510063257 A CN 200510063257A CN 100364318 C CN100364318 C CN 100364318C
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Abstract
The present invention relates to a method for accurately controlling video signals, which belongs to the technical field of broadcasting control systems of broadcasting televisions. The broadcasting control system in the prior art is constructed under a non-real time time-sharing operating system, so that real time performance can not be ensured by using the time-sharing operation system to control devices; the broadcasting control system often relates to various devices which are very different from each other, and device control delay often happens; the prior art often adopts configuring, even hard coding, methods, and control logic is complicated with errors occurring easily; a service often requires many kinds of devices to cooperate with each other, and message communication modes are often adopted, but messages are not in real time. The method of the present invention can realize accurate control of the video signals by combining time sequence chart prediction of the devices, multiple task management, a high precision clock and a field flyback synchronizing mode. By adopting the method of the present invention, the real time performance and the accuracy of the video signals under the time-sharing operating system can be improved greatly, and the possibility of error occurrence can be decreased. In addition, the method can be applied to various automated real time control.
Description
Technical field
The invention belongs to radio and television broadcast control system technical field, be specifically related to the accurately method of control of a kind of vision signal.
Background technology
The digital broadcast control system of radio and television is mainly used in to be supported TV station's broadcast operation flow, it is one of core application system of TV station, its major function is: according to the programme that weaves in advance, the various video and audio equipments of remote control are gone out playing programs on time accurately and reliably.The so-called TV signal that on time accurately is meant is play in the mode of per second 25 frames from the picture of appointment accurately in given moment point, not allowing to control moment point makes mistakes, multiframe or few frame can not appear, promptly need accurately to hold the opportunity that control command is sent, front and back can not surpass the time of 1 frame (40 milliseconds), only in this way could guarantee program picture smoothness when broadcasting, multiframe not, not frame losing.If it is exactly accident that TV signal is not broadcasted in given moment point on time, even can cause serious loss, therefore accurate broadcast of frame is the necessary characteristic of radio and television broadcast control system aspect business demand, we can say that broadcast control system is a real-time control system.
For better control of video signal, just must understand the TV display mode and utilize its characteristics to control better.Field flyback also is vertical blanking period, and English is VBI, is the abbreviation of Vertical BlankingInterval.The picked-up of television image and show is carried out the mode of image scanning with electron beam, i.e. television scanning, electron beam are finished a line scanning and got back to this section retrace interval of another beginning-of-line and be called line flyback phase or row latent period; Electron beam is finished a frame scan and is got back to this section retrace interval of another frame starting point and be called image flyback phase or frame blanking phase.What the radio and television of China adopted is 625 row interlace modes, interlacing scan is with a two field picture (field) scanning at twice, first scan 1,3,5 earlier, odd-line interlaced scan such as 7..., even number line gratings such as second field scan 2,4,6,8..., usually odd field is in the field that will scan odd-numbered line, even field is in the field of scanning even number line, and the flyback time between odd field and the even field is called field flyback phase or vertical blanking period.For better control of video signal, make frame and frame not occur shake when switching, the control command that broadcast control system sends must be carried out control corresponding to various video equipments in field flyback, thereby realizes the accurate control to vision signal, so just can reach reasonable visual effect.
Broadcast control system is a real-time control system, its instruction of sending control appliance must be put within 1 frame (40 milliseconds) error range at given time, but, broadcast control system but is to be structured under the non real-time time sharing operating system, be under time sharing operating system, various device to be controlled, thereby can't guarantee real-time; Simultaneously, broadcast control system relates to the equipment of polytype, brand, model, these equipment are in control mode, carry out the characteristic aspect and all have very big-difference, Equipment Control takes place and postpones in regular meeting, usually adopt the method for configuration even hard coded to solve the problem that Equipment Control postpones in the prior art, but this method control logic is complicated and make mistakes easily; And finish a business and often need the work of a plurality of (kind) equipment collaboration, these equipment rooms adopt the mode collaborative work of message communication usually, but message is non real-time, handle and disperse, efficient is low, often cause controlling inaccuracy, therefore realizing video signal frame is accurately controlled is a very challenging job.For example use video tape recorder to play one section material and upload to such business in the video server, needing broadcast control system to send the commands for controlling video tape recorder shifts to an earlier date tape transport and makes picture motion smooth, the video server device is ready in advance records work, video tape recorder be played to appointment upload picture the time accurately the control of video server begin to record, record and accurately to stop last frame and control of video server that video tape recorder recording at needs when finishing and finish to record, as can be seen, in this business, need broadcast control system that the equipment that relates to is accurately controlled, could upload to program in the video server on time accurately and reliably.
Summary of the invention
The object of the present invention is to provide the accurately method of control of a kind of vision signal, this method can improve the real-time and the accuracy of vision signal control under the time sharing operating system greatly, can reduce the complexity of time sharing operating system control logic, reduce the possibility of makeing mistakes, and can be applied to various automation real-time control systems.
For reaching above purpose, the technical solution used in the present invention is: a kind of vision signal is the method for control accurately, may further comprise the steps:
(1) broadcast control system is according to device characteristics, in conjunction with the control sequencing of cooperative device, predict device sequential chart;
(2) the multiple task management device is set in broadcast control system, carry out multiple task management, the multiple task management device is according to the real-time requirement of equipment sequential chart and control action, the priority that sets the tasks and the sequencing of execution, multiple task management device scheduler task is accurately controlled equipment in the control moment point, guarantee mission critical crucial moment to the taking of cpu resource, thereby realize that a plurality of inter-related tasks are in the i.e. control in 40 milliseconds of error ranges of a frame.
Described broadcast control system is implemented under the non real-time time sharing operating system.
Further, during the predict device sequential chart, the concrete grammar of employing is in the step (1):
A) broadcast control system is provided with device characteristics by configuration file, and device characteristics comprise model, time of delay, the parallel-adder settle-out time of equipment, and some equipment also needs some specific properties, refers to as equipment
The blanking time that order sends;
B) broadcast control system reads this configuration file, forming device control characteristic table when starting;
C) broadcast control system was searched the Equipment Control property list, and in conjunction with the current task situation of having submitted to, is arranged out the Equipment Control sequential chart according to the equipment and the control time of using in the control of submitting to;
D) broadcast control system optimal control opportunity, the formation task, and be submitted to task manager.
Further, step is provided with the multiple task management device in (2), and when carrying out multiple task management, the concrete grammar of employing is:
A) task of the prediction of the multiple task management device accepting device sequential chart in broadcast control system submission;
B) the multiple task management device in the broadcast control system was inserted into task in the task list according to the control time of task;
C) task in the tabulation of the multiple task management device scheduler task in the broadcast control system is in its moment point control corresponding equipment.
Further again, task in the step c) in the step (2) in the tabulation of multiple task management device scheduler task is when its moment point control corresponding equipment, the employing field flyback is synchronous, promptly utilize hardware or software mode to provide to have reference video (RefVideo) card periodically to send or the equivalent functions of frame synchronizing signal, broadcast control system utilizes the synchronizing signal control command to send opportunity, guarantee in field flyback, to send control command, realize accurate control equipment.
Further, in the time sharing operating system in step (1) and step (2) a kind of high accuracy clock is set also, for the accurate control of video signal of time sharing operating system provides correct time, clock setting is stable for having, orderly, high accuracy, phase locked characteristic; Described stable, be meant that clock setting is not for existing saltus step; Make the time dullness in the described assignment procedure that is meant clock in order; Described high accuracy is meant that the unit's of making precision is higher than a millisecond rank in the setting of clock; Described Phase synchronization is meant that system clock phase place and video equipment synchronizing signal are set to synchronously.
Further again, for the high precision clock that is provided with, this clock is proofreaied and correct, concrete grammar is: adopt in-process high precision clock and unified network clocking framework correction mechanism to realize the high accuracy stable clock that distributed local is interior, in-process high precision clock obtains the high time interval of precision by the high precision clock counter that obtains computer, external clock by a high stable provides fiducial time, calibrates the error of this machine and external clock automatically by unified network clocking framework; Simultaneously, in order to guarantee the order of clock, promptly in the clock correction process, can not cause the time to be undergone mutation, adopt the slowly correcting mode of intelligence, describedly be meant that slowly proofreading and correct is that non-once is proofreaied and correct immediately through repeatedly proofreading and correct, the number of times of correction is to decide according to the blanking time and the correction amplitude of current time with the check point moment; Described intelligence is meant that timing can decide the amplitude of once proofreading and correct according to current time and check point blanking time constantly, and the amplitude in trimming process changes.
Effect of the present invention is: improved the real-time and the accuracy of vision signal control under the time sharing operating system greatly, reduced the complexity of time sharing operating system control logic, reduced the possibility of makeing mistakes, can be applied to various automations simultaneously and control in real time.
Description of drawings
Fig. 1 is that the frame of a business is accurately controlled schematic diagram;
Fig. 2 is the accurately flow chart of the method for control of a kind of video signal frame.
Embodiment
The present invention will be further described below in conjunction with the drawings and the specific embodiments:
As shown in Figure 1, a professional use-case decomposites a plurality of control actions, through the prediction of equipment sequential chart, form a plurality of tasks, be submitted in the task manager, according to high precision clock and field flyback synchronizing signal, scheduler task is put in particular moment equipment is controlled, and finally finishes a professional use-case.
As shown in Figure 2, a kind of video signal frame is the method for control accurately, may further comprise the steps:
(1) equipment sequential chart prediction.Broadcast control system in conjunction with the control sequencing of cooperative device, estimates the sequential chart that equipment state changes according to equipment characteristic separately, utilizes these sequential charts to come the opportunity of optimizing equipment control command emission then, reduces because the error that the equipment time-delay causes.The characteristic separately of equipment mainly is meant response time-delay, the control sequence of Equipment Control instruction and reaches the stable time and has nothing in common with each other, for example pre-volume instruction, video tape recorder slides into designated frame linearly from current point, time is long, usually need just can finish at 3～5 minutes, and for nonlinear video server, only need 1～3 second.Described broadcast control system is implemented under the non real-time time sharing operating system.
During the predict device sequential chart, the concrete grammar of employing is:
1) broadcast control system is provided with device characteristics by configuration file, and device characteristics comprise model, time of delay, the parallel-adder settle-out time of equipment, and some equipment also needs some specific properties, as the blanking time of device directive transmission;
2) broadcast control system reads this configuration file, forming device control characteristic table when starting;
3) broadcast control system was searched the Equipment Control property list, and in conjunction with the current task situation of having submitted to, is arranged out the Equipment Control sequential chart according to the equipment and the control time of using in the control of submitting to;
4) broadcast control system optimal control opportunity, the formation task, and be submitted to task manager.
(2) the multiple task management device is set in broadcast control system, carry out multiple task management, the multiple task management device is according to the real-time requirement of equipment sequential chart and control action, the priority that sets the tasks and the sequencing of execution, multiple task management device scheduler task is accurately controlled equipment in the control moment point.Control in particular moment has just constituted a task to time sharing operating system to each equipment, and a professional use-case has a plurality of (kind) equipment collaboration to finish usually, therefore, a professional use-case decomposites a plurality of control actions, through the prediction of equipment sequential chart, form a plurality of tasks, the multiple task management device is according to the Control Parameter (time and priority) of equipment sequential chart prediction formation particular task, task is dispatched on timeline, be that each task is controlled equipment in its execution constantly, with guarantee mission critical crucial moment to the taking of cpu resource, thereby realize the control of a plurality of inter-related tasks in a frame error scope.
The multiple task management device is set, and when carrying out multiple task management, the concrete grammar of employing is:
1) task of the prediction of the task manager accepting device sequential chart in broadcast control system submission;
2) task manager in the broadcast control system was inserted into task in the task list according to the control time of task;
3) task in the tabulation of the task manager scheduler task in the broadcast control system is in its moment point control corresponding equipment.
In step of present embodiment (1) and the step (2), for accurately controlling each moment point, a kind of high accuracy clock also is set in time sharing operating system, for the accurate control of video signal of time sharing operating system provides correct time, clock setting is stable for having, orderly, high accuracy, phase locked characteristic; Described stable, be meant that clock setting is not for existing saltus step; Make the time dullness in the described assignment procedure that is meant clock in order; Described high accuracy is meant that the unit's of making precision is higher than a millisecond rank in the setting of clock; Described Phase synchronization is meant that system clock phase place and video equipment synchronizing signal are set to synchronously.
For the high precision clock that is provided with, for guaranteeing the accuracy of its time, need proofread and correct this clock, concrete grammar is: adopt in-process high precision clock and unified network clocking framework correction mechanism to realize the high accuracy stable clock that distributed local is interior, in-process high precision clock obtains the high time interval of precision by the high precision clock counter that obtains computer, external clock by a high stable provides fiducial time, calibrates the error of this machine and external clock automatically by unified network clocking framework; Simultaneously, in order to guarantee the order of clock, promptly in the clock correction process, can not cause the time to be undergone mutation, adopt the slowly correcting mode of intelligence, describedly be meant that slowly proofreading and correct is that what is called is meant that slowly proofreading and correct is that non-once is proofreaied and correct immediately through repeatedly proofreading and correct, the number of times of correction is to decide according to the blanking time and the correction amplitude of current time with the check point moment; Described intelligence is meant that timing can decide the amplitude of once proofreading and correct according to current time and check point blanking time constantly, and the amplitude in trimming process changes.Vision signal need be switched in field sync signal could guarantee the picture smoothness, therefore needs clock phase and field flyback signal Synchronization.
Because various control commands must be carried out control corresponding to various video equipments in field flyback, could realize accurate control to vision signal, thereby reach reasonable visual effect, therefore in order to realize of the accurate control of various control commands to video equipment, in the present embodiment, in order to make system clock phase place and video equipment synchronizing signal synchronous better, the employing field flyback is synchronous, promptly utilize hardware or software mode to provide to have reference video (RefVideo) card periodically to send or the equivalent functions of frame synchronizing signal, broadcast control system utilizes the synchronizing signal control command to send opportunity, thereby realize audio ﹠ video equipment synchronizing signal and system clock Phase synchronization, guarantee in field flyback, to send control command, realize accurate control equipment.
To upload task be that example explanation utilizes method achieve frame of the present invention accurately to control to finish one below, and the specific implementation method is as follows:
Suppose to record frame from 00:00:00:00,00:00:29:24, promptly 30 seconds materials,
1) video tape recorder standby on promptly makes magnetic head be in movable state;
2) video tape recorder is rolled onto designated frame-00:00:05:00 in advance, causes float occurring because video tape recorder begins the speed shakiness of tape transport, just can reach stable in 5 seconds according to recorder characteristic needs tape transport, therefore is rolled onto in advance-the 00:00:05:00 frame;
3) lick in the journey to video server emission in advance at video tape recorder and record warning order;
4) video tape recorder is spooled in advance, after video server is successfully recorded preparation, sends play command to video tape recorder;
5) play 5 seconds near 00:00:00:00, in field flyback, send record command to video server;
6) after 30 seconds, transmission is ceased and desisted order to video server, and video tape recorder sends and ceases and desist order.
Need the order that sends in the above-mentioned steps and predict that according to the equipment sequential chart forming a plurality of tasks is submitted in the task manager constantly, task manager is responsible for scheduler task, each task is carried out at it by high precision clock and constantly equipment is controlled, and such one group of relevant task has realized the frame of uploading task is controlled accurately jointly.
Method of the present invention is not limited to the embodiment described in the embodiment, and those skilled in the art's technical scheme according to the present invention draws other execution mode, belongs to technological innovation scope of the present invention equally.
Claims (6)
1. the accurate method of control of a vision signal may further comprise the steps:
(1) broadcast control system is according to device characteristics, in conjunction with the control sequencing of cooperative device, predict device sequential chart;
(2) the multiple task management device is set in broadcast control system, carry out multiple task management, the multiple task management device is according to the real-time requirement of equipment sequential chart and control action, the priority that sets the tasks and the sequencing of execution, multiple task management device scheduler task is accurately controlled equipment in the control moment point.
Described broadcast control system is implemented under the non real-time time sharing operating system.
2. a kind of vision signal as claimed in claim 1 is the method for control accurately, it is characterized in that: during the predict device sequential chart, the concrete grammar of employing is in the step (1):
A) broadcast control system is provided with device characteristics by configuration file, and described device characteristics comprise the blanking time that model, time of delay, parallel-adder settle-out time, the device directive of equipment send;
B) broadcast control system reads this configuration file, forming device control characteristic table when starting;
C) broadcast control system was searched the Equipment Control property list, and in conjunction with the current task situation of having submitted to, is arranged out the Equipment Control sequential chart according to the equipment and the control time of using in the control of submitting to;
D) broadcast control system optimal control opportunity, the formation task, and be submitted to task manager.
3. a kind of vision signal as claimed in claim 1 is the method for control accurately, and it is characterized in that: step is provided with the multiple task management device in (2), and when carrying out multiple task management, the concrete grammar of employing is:
A) task of the prediction of the multiple task management device accepting device sequential chart in broadcast control system submission;
B) the multiple task management device in the broadcast control system was inserted into task in the task list according to the control time of task;
C) task in the tabulation of the multiple task management device scheduler task in the broadcast control system is in its moment point control corresponding equipment.
4. a kind of vision signal as claimed in claim 3 is the method for control accurately, it is characterized in that: the task in the step c) in the step (2) in the tabulation of multiple task management device scheduler task adopts field flyback synchronous when its moment point control corresponding equipment, promptly utilize hardware or software mode to provide and have the equivalent functions that the reference video card periodically sends field or frame synchronizing signal, broadcast control system utilizes the synchronizing signal control command to send opportunity, guarantee in field flyback, to send control command, realize accurate control equipment.
5. a kind of vision signal as claimed in claim 1 is the method for control accurately, it is characterized in that: in the time sharing operating system in step (1) and step (2) a kind of high accuracy clock is set also, for the accurate control of video signal of time sharing operating system provides correct time, clock setting is stable for having, orderly, high accuracy, phase locked characteristic; Described stable, be meant that clock setting is not for existing saltus step; Make the time dullness in the described assignment procedure that is meant clock in order; Described high accuracy is meant that the unit's of making precision is higher than a millisecond rank in the setting of clock; Described Phase synchronization is meant that system clock phase place and video equipment synchronizing signal are set to synchronously.
6. a kind of vision signal as claimed in claim 5 is the method for control accurately, it is characterized in that: for the high precision clock that is provided with, this clock is proofreaied and correct, concrete grammar is: adopt in-process high precision clock and unified network clocking framework correction mechanism to realize the high accuracy stable clock that distributed local is interior, in-process high precision clock obtains the high time interval of precision by the high precision clock counter that obtains computer, external clock by a high stable provides fiducial time, calibrates the error of this machine and external clock automatically by unified network clocking framework; Simultaneously, in order to guarantee the order of clock, promptly in the clock correction process, can not cause the time to be undergone mutation, adopt the slowly correcting mode of intelligence, describedly be meant that slowly proofreading and correct is that non-once is proofreaied and correct immediately through repeatedly proofreading and correct, the number of times of correction is to decide according to the blanking time and the correction amplitude of current time with the check point moment; Described intelligence is meant that timing can decide the amplitude of once proofreading and correct according to current time and check point blanking time constantly, and the amplitude in trimming process changes.
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| CNB2005100632572A CN100364318C (en) | 2005-04-07 | 2005-04-07 | A video signal accurate control method |
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| CNB2005100632572A CN100364318C (en) | 2005-04-07 | 2005-04-07 | A video signal accurate control method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1940858B (en) * | 2005-09-26 | 2011-06-15 | 深圳市朗科科技股份有限公司 | Method of Multi-task realization of media player |
| CN103607338B (en) * | 2013-11-27 | 2017-01-11 | 福建星网锐捷网络有限公司 | Target object broadcasting method, device and system based on virtualization technology |
| CN103873739B (en) * | 2014-03-14 | 2017-10-17 | 中央电视台 | Many equipment collaboration control methods and equipment |
| CN106154867B (en) * | 2015-03-25 | 2019-11-08 | 上海分众软件技术有限公司 | A kind of cooperative control method and system and polyhedral projection display system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997039582A1 (en) * | 1996-04-15 | 1997-10-23 | Nds Limited | Digital video broadcast system |
| CN1312650A (en) * | 2000-01-10 | 2001-09-12 | Lg电子株式会社 | Method and system for synchronizing video index between audio-frequency/video-frequency signals and datas |
| CN1432934A (en) * | 2001-12-28 | 2003-07-30 | Lg电子株式会社 | Data content transmitting system and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997039582A1 (en) * | 1996-04-15 | 1997-10-23 | Nds Limited | Digital video broadcast system |
| CN1312650A (en) * | 2000-01-10 | 2001-09-12 | Lg电子株式会社 | Method and system for synchronizing video index between audio-frequency/video-frequency signals and datas |
| CN1432934A (en) * | 2001-12-28 | 2003-07-30 | Lg电子株式会社 | Data content transmitting system and method |
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