CN1606346A - Automatic recovery method for digital TV receiver program - Google Patents
Automatic recovery method for digital TV receiver program Download PDFInfo
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- CN1606346A CN1606346A CNA2003101000265A CN200310100026A CN1606346A CN 1606346 A CN1606346 A CN 1606346A CN A2003101000265 A CNA2003101000265 A CN A2003101000265A CN 200310100026 A CN200310100026 A CN 200310100026A CN 1606346 A CN1606346 A CN 1606346A
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Abstract
This invention discloses a program automatic recovery method for digital TV receiving device. The master chip actively starts a monitor program at each definite time or starts it by receiving interrupt signals of a channel decoder, then to make judgment if the channel decoder is locked, if so, it exits from the monitor program, otherwise, it carries out signal evaluation to judge the signal state, if the signal is normal, it quits from the monitor program, otherwise, it searches for the current program again. After the program is recovered, it displays related information to the user end, if the program can't be recovered, then it quits from the monitor program, which judges the state of the current input network signal by software if the signal is abnormal, the control software of the receive device will inform the user device about the reason. After the signal is normal, the receive device can automatically finish the normal receive and play to inform the users to realize automatic recovery of programs.
Description
Technical field
The present invention relates to a kind of program automatic recovery method that is applied to apparatus of digital television receiving, particularly relate in apparatus of digital television receiving by the software active inquiry or utilize the operating state of interrupt signal monitor channel decoder, realize signal condition Presentation Function and the method recovered automatically of program after unusual of radio-frequency input signals in the apparatus of digital television receiving.
Background technology
Apparatus of digital television receiving is in the digital service that the reception Virtual network operator provides, radiofrequency signal is input to receiving equipment, at first realize the tuning work of radiofrequency signal by tuner, with radiofrequency signal be tuned to intermediate frequency or baseband signal, give channel decoder then, channel decoder is finished channel-decoded, and intermediate-freuqncy signal or baseband signal are converted into standard transmission stream (TS stream) output.Standard transmission stream just can be realized reception, the playing function of program through the master chip relevant treatment.
Program is in normal reception, playing process, and the radiofrequency signal of input may be interrupted suddenly or because the noise that is interfered rises suddenly, be caused receiving front-end channel decoder losing lock, and program can't normally receive, play.Cause unusual reason to disappear, possible radiofrequency signal is very fast recovers normal again, but, the functional module that existing apparatus of digital television receiving is not monitored in real time to current input radio frequency signal condition, in case above-mentioned situation occurs, apparatus of digital television receiving can't notify the current program of user to receive, play the unusual reason of appearance, also can't recover normal the back in time reception and the broadcast of the current program of recovery at network signal.User's receiving equipment current channel signal of new search of laying equal stress on that only resets judges whether signal recovers normal unusually or.
Because the monitor controller of cable network digital signal design complexity and cost are higher, so the control module that current network digital signal state is monitored is not provided in the existing apparatus of digital television receiving.Apparatus of digital television receiving is when receiving current cable network digital signal, in case radiofrequency signal is interrupted or because of instantaneous interference causes the channel-decoded losing lock, the reception of program and playing just can stop.If it is normal that the network radio frequency signal recovers, channel decoder can't be recovered operate as normal.Only reset the channel decoder relevant parameter and search for the normal reception that current demand signal could be realized channel signal.Usually; the user only restarts receiving equipment and searches for the normal reception that realizes program again; and; because the control device of current network digital signal state not being monitored; the state domestic consumer of current channel signal can't know, the user can't know whether channel signal has recovered normally or when can recover normal.Therefore, when network signal was unstable, receiving equipment almost can't operate as normal.
Summary of the invention
The technical problem to be solved in the present invention is the program automatic recovery method that proposes a kind of apparatus of digital television receiving, pass through software control method, realized the demonstration of the signal condition after unusual of radio-frequency input signals in the apparatus of digital television receiving, and after radio-frequency input signals recovered, program can recover automatically.
The method of the invention comprises the steps:
Step 1, the monitoring program that starts;
Step 2, judge whether channel decoder locks,, then change step 5 if locked;
Step 3, carry out signal evaluation, judge the current demand signal level according to current AGC signal, the carrier-to-noise ratio C/N of assessing signal and channel-decoded error rate BER are judged signal condition;
If the step 4 signal is undesired, to the user terminal displays relevant information; Otherwise search recovers current program again, realizes the automatic recovery of program;
Step 5, withdraw from monitoring program.
The present invention monitors the state of a control of current channel-decoded chip by software mode, judges the state of current fan-in network signal; In case in the current network signal occur unusual, just the Control Software of receiving equipment can by display terminal at once notifying user equipment accept unusual reason, as the state of current network signal: level is too low, error code is too high or noise is too big etc.If after a period of time, it is normal that signal recovers, and what receiving equipment can be finished program automatically normally receives, plays and notify the user again; Make the user can better understand the reason that breaks down, realized the automatic recovery of program, avoided cycle power repeatedly.
Description of drawings
Fig. 1 is the TV-set top box that adopts the method for the invention;
Fig. 2 is the flow chart of program automatic recovery method of the present invention;
Fig. 3 is the principle schematic of program automatic recovery method of the present invention.
Embodiment
The present invention is directed to existing technical deficiency and propose a kind of program automatic recovery method, by the current network signal is monitored in real time, and recover normal back at network signal and recover the program normal play automatically.
Fig. 1 has provided the TV-set top box that adopts the method for the invention, understands the present invention for convenience, and each functions of modules among Fig. 1 is briefly described below:
The major function of tuner is to finish the down-conversion work of the digital radio signal of importing in the cable TV network, cooperates with the rear end channel decoder, for channel decoder provides intermediate frequency or baseband signal in its working range.
Channel decoder is finished the demodulation work of intermediate frequency or baseband digital signal, and the outputting standard transport stream is given master chip.Channel decoder provides lock-out state by the packet header (0x47) of detecting demodulation output transport stream.Control the parameters such as level, carrier-to-noise ratio and the error rate that can obtain current radiofrequency signal by software programming, the while can be controlled and make it when locking and out-of-lock condition variation, produces interrupt request singal to master chip.
Channel decoder is under locking and losing lock situation, its state changes, produce an interrupt request singal by hardware by it and offer master chip, in case channel signal changes when causing the channel decoder losing lock like this, promptly can not find the packet header (0x47) of demodulation output transport stream, just can notify master chip channel-decoded losing lock.
Master chip is used for finishing reception, processing and the playing function of transport stream, simultaneously the whole workflow of Control Software.Display terminal is final user interface.
The present invention utilizes the part controlled function of receiving equipment front passage decoding chip in conjunction with software control, realize the monitoring of current channel signal basic status, after the channel decoder losing lock, in case it is normal that signal recovers, receiving equipment recovers the smooth reception, broadcast of current program automatically and the current network signal condition is fed back to the user in real time.
Fig. 2 is the principle schematic of program automatic recovery method of the present invention, wherein,
Program recovers the reception again and the broadcast of locking, program again that control unit is used for finishing channel-decoded automatically; The terminal that the terminal indicative control unit is finished user interface shows; The real-time monitoring modular of channel decoder lock-out state is finished the real-time monitoring to the channel decoder lock-out state.
Signal quality comprehensive assessment control unit is used for finishing the comprehensive assessment to current channel signal quality, and the real-time monitoring modular of AGC is finished the real-time monitoring to current demand signal AGC; The real-time monitoring modular of C/N is finished the real-time monitoring to current demand signal C/N; The real-time monitoring modular of BER is finished the real-time monitoring to current demand signal BER.
Four real-time monitoring modulars among Fig. 2 (being the real-time monitoring modular of AGC, the real-time monitoring modular of C/N, the real-time monitoring modular of BER, the real-time monitoring modular of channel decoder lock-out state) are independently finished oneself relevant status monitoring separately under the control of signal quality comprehensive assessment control unit.
Monitoring modular is submitted to signal quality comprehensive assessment control unit with the monitoring information of gained, signal quality comprehensive assessment control unit is finished the real time comprehensive assessment to the current network signal, assessment result submits to the terminal indicative control unit and program recovers control unit automatically, the reason of terminal indicative control unit control display terminal shows signal state or poor signal; Program recovers the recovery that control unit is responsible for video automatically.
According to the design principle of Fig. 2, the present invention has further proposed the flow chart of program automatic recovery method as shown in Figure 3.Concrete steps are described as follows:
Step 1, the monitoring program that starts;
Step 2, judge whether channel decoder locks,, then change step 5 if locked;
Step 3, carry out signal evaluation, judge the current demand signal level according to current AGC signal, the carrier-to-noise ratio C/N of assessing signal and channel-decoded error rate BER are judged signal condition;
If the step 4 signal is undesired, to the user terminal displays relevant information; Otherwise search recovers current program again, realizes the automatic recovery of program;
Step 5, withdraw from monitoring program.
In the method for the invention, at first to start monitoring program.
Start monitoring program and can adopt dual mode, first active mode, promptly master chip starts monitoring program at set intervals by task mechanism; It two is passive modes, starts monitoring program by detecting interrupt signal, is example with the digital TV set-top box, at first need draw the interruption controls holding wire to master chip interruption controls mouth, as shown in Figure 1 from channel decoder on hardware.
Initiatively in the mode that starts, master chip starts monitoring program at set intervals by task mechanism, monitoring program judges at first whether channel decoder locks, if locking then withdraw from monitoring program, otherwise the assessment of beginning current demand signal state and in user terminal displays dependent evaluation information.If signal condition is good, search for current program again, program recovers then to withdraw from monitoring program; If abnormal signal then shows the current demand signal relevant information and withdraws from monitoring program.
In the mode of passive startup, in case channel decoder losing lock, will produce interrupt requests, the present invention has then utilized this interrupt requests to start monitoring facilities, master chip need not frequently to inquire about current channel decoder lock-out state, therefore the relative initiatively Starting mode of interrupt mode can be saved cpu resource, and flow process afterwards is identical.
In order to realize real-time monitoring to signal, obtain the state information of current demand signal, the present invention has adopted initiatively and the simultaneous Starting mode of passive dual mode: after promptly starting monitoring program for the first time by passive mode, open active mode, this moment, two kinds of Starting mode existed simultaneously, just start monitoring program at set intervals, current demand signal is assessed, realize the real-time monitoring of signal thus by active mode; Recover normal up to program, close active mode again, change single passive Starting mode over to, up to channel decoder losing lock once more.
When channel decoder changed between locking and out-of-lock condition, the state of software requestor changed; During passive Starting mode, when channel decoder changes between locking and out-of-lock condition, hardware produces an interrupt request singal and offers master chip, in case channel signal changes and causes channel decoder losing lock (synchronous head 0x47 does not find) like this, just can notify master chip channel-decoded losing lock.
Monitoring program will judge earlier whether channel decoder locks after starting, and judges whether signal has recovered normally can avoid misoperation like this, reduces the expense of operation monitoring program.Monitoring program is by the channel decoder monitoring module, and the state of sense channel decoder software requestor judges according to this whether channel decoder locks.
When channel decoder is in out-of-lock condition, just to begin to assess the current network signal.To judge that at first signal level value is abnormal,, then need not to judge again the relevant information of other signal, directly assess, show relevant information and withdraw from monitoring program to the user if this moment, signal level was unusual.Because cause the most important reason of channel decoder losing lock not have signal exactly, be reflected in the monitoring program, will find level unusual (on the low side); Therefore, this situation is handled separately at first.
Because after configuring channel decoder AGC module on demand, radiofrequency signal is through after the front-end tunes, convert intermediate-freuqncy signal to and be transferred to channel decoder, the AGC module of channel decoder inside can be adjusted the amplification coefficient of front radio-frequency and intermediate-freuqncy signal according to the amplitude of input intermediate-freuqncy signal.Therefore, can utilize value and the corresponding relation of input radio frequency signal level value or the real-time adaptive of mapping table and AGC module of inner AGC,, calculate the level of current input radio frequency signal by reading inner AGC register value in real time.Monitoring program can judge according to this level value whether current demand signal is normal.Digital radio signal is level range just often: 40dBuV---100dBuV.If signal level≤40dBuV represents that then signal level is too low; If signal level 〉=100dBuV represents that then signal level is too high, more than two kinds of situation lower channel decoders all can't operate as normal.
If signal level in normal range (NR), starts the current error rate and the carrier-to-noise ratio that background monitor is assessed channel decoder this moment;
Channel decoder has a noise assessment integrator, in the channel-decoded process, and the reference noise that it comes the real time record current demand signal by the physical location and the deviation in the ideal signal constellation of comparison signal planisphere.Therefore, can utilize the corresponding relation (or mapping table) of reference noise that this module provides and the actual carrier-to-noise ratio of current demand signal to find out the relation of the two, thus, monitoring program can judge just whether the carrier-to-noise ratio of current demand signal is normal.Digital radio signal just often carrier-to-noise ratio scope is more than the 23dB, if the carrier-to-noise ratio of current demand signal is less than or equal to 22dB, represents that then signal noise is too big, and channel decoder can't operate as normal.
Channel decoder has the error code testing module, can make the byte number (byte) of error code in this module records a period of time or the byte number or the figure place of figure place (bit) and all packets of information as required, therefore, carry out software statistics by the real-time monitoring modular of error code, just can obtain the error rate of current demand signal.Digital radio signal error code scope exists :≤5 * 10
-4The time, channel decoder can be finished error correction; If the error rate 〉=1 * 10
-4, part signal can't error correction, can influence the reception and the broadcast of program.So, if the error rate is 1 * 10
-3On the order of magnitude, can think that just signal quality is too poor, the rear end receives and plays can't operate as normal.
Monitoring program comprehensively judges the reason of current losing lock and relevant information fed back to the user by user interface according to above relevant information, and whether control starts program and recover control module automatically.
After signal recovers normally, active and passive mode can start monitoring program, the real time information of monitoring modular picked up signal, signal quality comprehensive assessment control unit just can in time be notified program to recover module automatically and allow it search for again, finish the automatic recovery of program; Can be implemented in so just that radiofrequency signal is interrupted or other reasons cause the channel decoder losing lock after signal in case recover normal, reception, broadcast that receiving equipment monitoring form unit can in time recover current demand signal.
On set-top box platform, realized the program auto restore facility by above-mentioned dual mode.Under situations such as signal interruption or instability, realize real-time monitoring to signal, signal is in case recovery is normal, and the program of set-top box just can in time recover.
It should be noted last that: above embodiment is the unrestricted technical scheme of the present invention in order to explanation only, although the present invention is had been described in detail with reference to the foregoing description, those of ordinary skill in the art is to be understood that: still can make amendment or be equal to replacement the present invention, and not breaking away from any modification or partial replacement of the spirit and scope of the present invention, it all is encompassed in the middle of the claim scope of the present invention.
Claims (10)
1, a kind of program automatic recovery method of apparatus of digital television receiving is characterized in that: comprise the steps:
Step 1, the monitoring program that starts;
Step 2, judge whether channel decoder locks,, then change step 5 if locked;
Step 3, carry out signal evaluation, judge the current demand signal level according to current AGC signal, the carrier-to-noise ratio C/N of assessing signal and channel-decoded error rate BER are judged signal condition;
If the step 4 signal is undesired, to the user terminal displays relevant information; Otherwise search recovers current program again, realizes the automatic recovery of program;
Step 5, withdraw from monitoring program.
2, the program automatic recovery method of apparatus of digital television receiving according to claim 1, it is characterized in that: in the described step 1, the mode that starts monitoring program is an active mode, and promptly master chip starts monitoring program at set intervals automatically by task mechanism.
3, the program automatic recovery method of apparatus of digital television receiving according to claim 1 and 2, it is characterized in that: in the described step 1, the mode that starts monitoring program is a passive mode, when promptly if channel decoder changes between locking and out-of-lock condition, produce an interrupt request singal by hardware and offer master chip, master chip starts monitoring program.
4, the program automatic recovery method of apparatus of digital television receiving according to claim 3, it is characterized in that: adopt the passive mode that produces interrupt request singal to start monitoring program, before step 1, comprise following process: draw control signal wire from channel decoder and transmit the interruption controls signal to master chip interruption controls mouth.
5, the program automatic recovery method of apparatus of digital television receiving according to claim 1, it is characterized in that: in the described step 2, judge whether channel decoder locks, specifically comprise following process: by the lock-out state register of software inquiry channel decoder, sense channel decoder lock or losing lock.
6, the program automatic recovery method of apparatus of digital television receiving according to claim 1, it is characterized in that: described step 3 specifically comprises the steps:
Step 30: judge whether the current demand signal level is normal; If normal, execution in step 31; Otherwise, execution in step 32;
Step 31: judge further whether the carrier-to-noise ratio of current demand signal and the error rate be normal; Execution in step 32;
Step 32: end step three.
7, the program automatic recovery method of apparatus of digital television receiving according to claim 6, it is characterized in that: describedly judge whether current level signal is normal, specifically comprise following process:, calculate the level of current input signal by reading inner AGC register value in real time; According to this level value whether at the level range of digital signal just often: in the 40dBuV-100dBuV, can judge whether the current demand signal level normal.
8, the program automatic recovery method of apparatus of digital television receiving according to claim 6, it is characterized in that: describedly judge whether the carrier-to-noise ratio of current demand signal is normal, be specially and comprise following process: the noise assessment integrator by channel decoder obtains reference noise, calculates the carrier-to-noise ratio of current demand signal according to reference noise; Whether in carrier-to-noise ratio scope just often, promptly more than the 23dB, judge whether the carrier-to-noise ratio of current demand signal is normal according to the carrier-to-noise ratio of current demand signal.
9, the program automatic recovery method of apparatus of digital television receiving according to claim 6, it is characterized in that: describedly judge whether the current error rate is normal, be specially and comprise following process:, obtain the error rate of current demand signal in the mode of software statistics by the real-time monitoring modular of the error code of channel decoder; According to the error rate of current demand signal error code scope when signal is normal whether, promptly 5 * 10
-4Below, judge whether the error rate of current demand signal is normal.
10, the program automatic recovery method of apparatus of digital television receiving according to claim 1 is characterized in that: described step 4 specifically comprises following process: according to the result of step 3, and assessment network signal state; If signal is undesired, to the abnormal reason of user's shows signal, withdraw from monitoring program by display terminal; Otherwise signal is normal, and then search again recovers current program, withdraws from monitoring program after the automatic recovery of realization program.
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| CNA2003101000265A CN1606346A (en) | 2003-10-08 | 2003-10-08 | Automatic recovery method for digital TV receiver program |
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| CNA2003101000265A CN1606346A (en) | 2003-10-08 | 2003-10-08 | Automatic recovery method for digital TV receiver program |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100459716C (en) * | 2006-07-25 | 2009-02-04 | 北京中星微电子有限公司 | Decoding error restoring method for MPEG4 decoder |
| CN101753788A (en) * | 2008-12-22 | 2010-06-23 | 康佳集团股份有限公司 | Method for automatically updating signal parameters of television and television |
| CN101534430B (en) * | 2008-03-12 | 2012-09-26 | 中兴通讯股份有限公司 | Method for handling abnormal situations in playing of mobile TV and mobile terminal |
| CN101707665B (en) * | 2009-10-30 | 2013-11-20 | 深圳创维数字技术股份有限公司 | Method for inserting-broadcasting program when set top box is in blank screen |
| CN104994439A (en) * | 2015-08-04 | 2015-10-21 | 北京京东方多媒体科技有限公司 | Processing method of mis-operation, device and display device |
| CN106301604A (en) * | 2016-10-31 | 2017-01-04 | 维沃移动通信有限公司 | A kind of radio frequency path detection method and mobile terminal |
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2003
- 2003-10-08 CN CNA2003101000265A patent/CN1606346A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100459716C (en) * | 2006-07-25 | 2009-02-04 | 北京中星微电子有限公司 | Decoding error restoring method for MPEG4 decoder |
| CN101534430B (en) * | 2008-03-12 | 2012-09-26 | 中兴通讯股份有限公司 | Method for handling abnormal situations in playing of mobile TV and mobile terminal |
| CN101753788A (en) * | 2008-12-22 | 2010-06-23 | 康佳集团股份有限公司 | Method for automatically updating signal parameters of television and television |
| CN101707665B (en) * | 2009-10-30 | 2013-11-20 | 深圳创维数字技术股份有限公司 | Method for inserting-broadcasting program when set top box is in blank screen |
| CN104994439A (en) * | 2015-08-04 | 2015-10-21 | 北京京东方多媒体科技有限公司 | Processing method of mis-operation, device and display device |
| CN104994439B (en) * | 2015-08-04 | 2017-12-26 | 北京京东方多媒体科技有限公司 | A kind of processing method of maloperation, device and a kind of display device |
| US9973721B2 (en) | 2015-08-04 | 2018-05-15 | Boe Technology Group Co., Ltd. | Processing method and apparatus for misoperation, and display device |
| CN106301604A (en) * | 2016-10-31 | 2017-01-04 | 维沃移动通信有限公司 | A kind of radio frequency path detection method and mobile terminal |
| CN106301604B (en) * | 2016-10-31 | 2019-08-20 | 维沃移动通信有限公司 | A kind of radio frequency path detection method and mobile terminal |
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