CN103546705A - Receiver and method for switching signals thereof - Google Patents
Receiver and method for switching signals thereof Download PDFInfo
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- CN103546705A CN103546705A CN201310344423.0A CN201310344423A CN103546705A CN 103546705 A CN103546705 A CN 103546705A CN 201310344423 A CN201310344423 A CN 201310344423A CN 103546705 A CN103546705 A CN 103546705A
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Abstract
The invention discloses a method for switching signals and a corresponding receiver. The receiver can be in a ground signal receiving mode and a satellite signal receiving mode and internally comprises a ground signal receiving module, a satellite signal receiving module and a signal switching module. A TH-T and a TH-S are preset in the signal switching module, the TH-T represents a ground signal receiving error threshold, and the TH-S represents a satellite signal receiving error threshold; running modes of the receiver are judged by the signal switching module; the ground signal receiving module generates an ERR-T, the satellite signal receiving module generates an ERR-S, the signal switching module judges whether the running modes of the receiver are switched over or not by the aid of comparison among the ERR-T, the TH-T, the ERR-S and the TH-S, the ERR-T represents a ground signal receiving error rate, and the ERR-S represents a satellite signal receiving error rate.
Description
Technical field
The present invention relates to Digital TV Receiving technology, more particularly, relate to a kind of ground digital television signal of receiver and the changing method of satellite digital television signal and corresponding receiver.
Background technology
Digital Television is collection from TV programme, be fabricated into transmitting, receive the Generation Tvs that all adopt digital codings and digital transmission technology.Digital Television, not only has that antijamming capability is strong, frequency resource utilance high, but also television image and the Video service of high-quality can be provided.At present, China's digital television business mainly comprises terrestrial DTV, cable digital TV, satellite digital TV three classes.
Terrestrial DTV is to adopt the mode of terrestrial wireless transmission to realize a kind of digital television techniques that digital television signal transmits.Under terrestrial wireless transmission means, terminal, by receiving the ground digital television signal of television tower broadcast, is carried out watching of program.Terrestrial DTV has: the operator scheme of high information capacity, high flexible, the frequency planning of high flexible and region cover, support a plurality of transmission/Internet protocols, support multiple-working mode, support the advantages such as portable terminal device low-power consumption mode.But terrestrial DTV also can bring the shortcomings such as cliff effect (when receiving signal strength lower than a certain setting thresholding, the phenomenon of signal interruption occurring to receive).
Satellite digital TV, be utilize geostationary satellite by the television signal transmission of digital coding compression a kind of radio and television form of directly carrying out large area covering to user side.Satellite digital TV has that area coverage is large, long transmission distance, information capacity is large, signal quality is high, be not subject to the advantages such as geographical conditions restriction.Therefore, digital video broadcast-satellite is mainly distributed in the region that the populations such as border district comparatively disperse.Yet digital satellite television also has its shortcoming: have time delay, Bandwidth-Constrained, affected by weather environment and limited coverage rate etc.
Consider terrestrial DTV and satellite digital TV pluses and minuses separately, and the wireless and good complementary relationship of satellite broadcasting television, these two kinds of Digital Television form gangs of terrestrial DTV and satellite digital TV have become a kind of trend.Yet should when carry out to switch between ground digital television signal and satellite digital television signal in association system but not yet has a criterion.
Summary of the invention
Object of the present invention aims to provide the changing method of a kind of ground digital television signal and satellite digital television signal and carries out the receiver of the method, solves the switching problem between ground signal and satellite-signal in terrestrial DTV and satellite digital TV association system.
According to above-mentioned purpose, implement receiver signal changing method of the present invention, receiver comprises ground signal receiving mode and satellite signal receiving pattern, described changing method comprises the following steps: default TH-T and TH-S in receiver, wherein TH-T is the error threshold that ground signal receives, and TH-S is the error threshold of satellite signal receiving; The pattern of judgement receiver operation; Ground signal receiving mode generates ERR-T, and satellite signal receiving pattern generates ERR-S; According to the pattern of receiver operation, utilize and relatively judge whether running mode switching of receiver between ERR-T, TH-T, ERR-S, TH-S, wherein ERR-T represents the accurate prediction of signal error rates that ground signal receives, and ERR-S represents the accurate prediction of signal error rates of satellite signal receiving.
According to above-mentioned purpose, the receiver of implementing the corresponding said method of the present invention comprises ground signal receiving mode and satellite signal receiving pattern, and its inside comprises ground signal receiver module, satellite signal receiving module and signal handover module.Wherein, default TH-T and TH-S in signal handover module, wherein TH-T is the error threshold that ground signal receives, TH-S is the error threshold of satellite signal receiving; The pattern of signal handover module judgement receiver operation; Ground signal receiver module generates ERR-T, satellite signal receiving module generates ERR-S, according to the pattern of receiver operation, signal handover module utilizes and relatively judges whether running mode switching of receiver between ERR-T, TH-T, ERR-S, TH-S, wherein ERR-T represents the accurate prediction of signal error rates that ground signal receives, and ERR-S represents the accurate prediction of signal error rates of satellite signal receiving.
According to above-mentioned principal character, receiver is carried out following operation under ground signal receiving mode: ground signal receiver module generates ERR-T; Signal handover module judges whether ERR-T≤TH-T sets up, if set up, maintains ground signal receiving mode; If above formula is false, satellite signal receiving module generates ERR-S; Signal handover module continues to judge whether ERR-S>TH-S sets up, if set up, maintains ground signal receiving mode; If above two formulas are all false, signal handover module switches to satellite signal receiving pattern by receiver.
According to above-mentioned principal character, receiver is carried out following operation under satellite signal receiving pattern: ground signal receiver module generates ERR-T, and satellite signal receiving module generates ERR-S; Signal handover module judges whether ERR-S>TH-S or ERR-S>ERR-T set up, and if not, receiver is maintained to satellite signal receiving pattern; If so, receiver is switched to ground signal receiving mode.
According to above-mentioned principal character, ERR-T and ERR-S comprise bit error rate or the Packet Error Ratio of error sign ratio, bit error rate, ISN or outer code decoder after demapping.
Adopt technical scheme of the present invention, can make receiver receive between ground signal and satellite-signal and can switch, thereby can on to greatest extent, guarantee the continuity of the digital television signal reception of terrestrial DTV and satellite digital tv receiver.
Accompanying drawing explanation
In the present invention, identical Reference numeral represents identical feature all the time, wherein:
Fig. 1 is the part-structure schematic diagram of receiver of the present invention;
Fig. 2 is ground signal of the present invention and satellite-signal switching condition schematic diagram;
Fig. 3 is the concrete switching flow figure of Fig. 2.
Embodiment
Below in conjunction with drawings and Examples, further illustrate technical scheme of the present invention.
Signal switching method of the present invention is based on receiving accurate prediction of signal error rates ERR(Error Rate Return) comparison, wherein ERR signal can be regarded as: the bit error rate of the error sign ratio after demapping, bit error rate, ISN or outer code decoder or Packet Error Ratio etc.ERR signal of the present invention comprises: the accurate prediction of signal error rates ERR-T(Error Rate Return-Terrestrial that ground signal receives) and the accurate prediction of signal error rates ERR-S(Error Rate Return-Satellite of satellite signal receiving).
Shown in Fig. 1 is that receiver 1 of the present invention switches relevant part-structure schematic diagram to signal, receiver 1 has two kinds of operational modes, be ground signal receiving mode and satellite signal receiving pattern, difference corresponding ground signal receiving module 2 and satellite signal receiving module 4.In addition, the inner also signalization handover module 3 of receiver 1, can call the reception signal of ground signal receiver module 2 and satellite signal receiving module 4 and carry out signal switching method of the present invention.
Specifically, the error threshold TH(Threshold that the inner preset signal of signal handover module 3 receives), comprise the error threshold TH-T(Threshold-Terrestrial that ground signal receives) and the error threshold TH-S(Threshold-Satellite of satellite signal receiving).Signal handover module 3 can call ground signal receiver module 2, thereby obtain ERR-T, and can call satellite signal receiving module 4, thereby obtain ERR-S, then ERR-T and TH-T, ERR-S and TH-S, ERR-T and ERR-S are made comparisons to judge whether receiver 1 needs running mode switching.
With reference to Fig. 2, the general thought that receiver 1 carries out signal switching is:
Receiver 1 acquiescence receiving mode is ground signal receiving mode.During ERR-T better performances that ground signal causes (ERR-T≤TH-T), acquiescence operation ground signal receiving mode.The ERR-T poor-performing that the signal receiving when ground causes, and (ERR-T>TH-T when the ERR-S performance of satellite-signal is also poor, and ERR-S>TH-S), still keep acquiescence receiving mode, move ground signal receiving mode.
The ERR-T poor-performing that only has the signal that receives when ground to cause, and the ERR-S performance of satellite-signal is when higher (ERR-S≤TH-S, and ERR-T>TH-T), and receiver 1 is just switched to receiving satellite signal.
Satellite signal receiving pattern is as a kind of optional operational mode, its service conditions is harsher than the ground signal receiving mode of acquiescence, as long as the ERR-S poor-performing that satellite-signal causes, or the ERR-T performance that the ERR-S performance that satellite-signal causes causes not as ground signal (being that ERR-S>TH-S or ERR-S>ERR-T can have at least one to set up), receiver 1 just switches back ground signal receiving mode from satellite signal receiving pattern.
For the continuity that can guarantee that the digital television signal of terrestrial DTV and satellite digital tv receiver receives on to greatest extent, and inhibit signal switches difficult saltus step at any time, receiver 1 of the present invention is built-in the first counter 5 and the second counter 6 also, by signal handover module 3, call, make the step that signal switches add time delay.The general thought of switching in conjunction with receiver 1 signal shown in Fig. 2, detailed signal switching method as shown in Figure 3.
Step S01: during receiver 1 start, receiver 1 enters acquiescence operational mode, i.e. ground signal receiving mode.
Step S02: under ground signal receiving mode, ground signal receiver module 2 generates ERR-T.
Step S03: signal handover module 3 calls the ERR-T that ground signal receiver module 2 generates, and judges whether ERR-T≤TH-T sets up.If so, the next state of receiver 1 still rests on ground signal receiving mode.
Step S04: (being ERR-T>TH-T) if not, satellite signal receiving module 4 generates ERR-S.
Step S05: signal handover module 3 calls the ERR-S that satellite signal receiving module 4 generates, and judges whether ERR-S>TH-S sets up.If so, the next state of receiver 1 still rests on ground signal receiving mode.
Step S06: (being ERR-S≤TH-S) if not, judges whether ERR-T>TH-T and ERR-S≤TH-S reach pre-determined number (for example continuous L time) continuously.If not, the next state of receiver 1 still rests on ground signal receiving mode.
Step S07: if so, signal handover module 3 is switched to satellite signal receiving pattern by receiver 1 from ground signal receiving mode.
Step S08: under satellite signal receiving pattern, ground signal receiver module 2 generates ERR-T, and satellite signal receiving module 4 generates ERR-S.
Step S09: signal handover module 3 calls ground signal receiver module 2 and satellite signal receiving module 4, obtains respectively ERR-T and ERR-S, and judge whether ERR-S>TH-S or ERR-S>ERR-T set up.If not, the next state of receiver 1 still rests on satellite signal receiving pattern.
Step S10: if so, judge whether ERR-S>TH-S or ERR-S>ERR-T reach pre-determined number (for example continuous N time) continuously.If not, the next state of receiver 1 still rests on satellite signal receiving pattern, and if so, signal handover module 3 switches back ground signal receiving mode by receiver 1 from satellite signal receiving pattern.
The counting of step S06 and step S10 utilizes respectively the first counter 5 and the second counter 6 to realize.The first counter 5 is set to meet under ground signal receiving mode for calculating receiver 1 number of times of ERR-T>TH-T and ERR-S≤TH-S condition, for example, when described number of times reaches a predetermined value (continuous L time) continuously, signal handover module 3 is switched to satellite signal receiving pattern by receiver 1 from ground signal receiving mode.The set-up mode of the second counter 6 in like manner.
It will be understood to one skilled in the art that, above specification is only one or more execution modes in the numerous embodiment of the present invention, and not uses limitation of the invention.Any equalization variation, modification for the above embodiment and be equal to the technical schemes such as alternative, as long as connotation scope according to the invention, all will drop in the scope that claims of the present invention protect.
Claims (8)
1. a receiver signal changing method, described receiver comprises ground signal receiving mode and satellite signal receiving pattern, it is characterized in that, described changing method comprises the following steps:
Default TH-T and TH-S in receiver, wherein TH-T is the error threshold that ground signal receives, TH-S is the error threshold of satellite signal receiving;
The pattern of judgement receiver operation;
Ground signal receiving mode generates ERR-T, and satellite signal receiving pattern generates ERR-S; According to the pattern of receiver operation, utilize and relatively judge whether running mode switching of receiver between ERR-T, TH-T, ERR-S, TH-S, wherein ERR-T represents the accurate prediction of signal error rates that ground signal receives, and ERR-S represents the accurate prediction of signal error rates of satellite signal receiving.
2. receiver signal changing method as claimed in claim 1, is characterized in that, the determining step under described ground signal receiving mode is:
Generate ERR-T;
Judge whether ERR-T≤TH-T sets up, if set up, maintain ground signal receiving mode;
If be false, generate ERR-S;
Continue to judge whether ERR-S>TH-S sets up, if set up, maintain ground signal receiving mode;
If be false, receiver switches to satellite signal receiving pattern.
3. receiver signal changing method as claimed in claim 1, is characterized in that, the determining step under described satellite signal receiving pattern is:
Generate ERR-T and ERR-S;
Judge whether ERR-S>TH-S or ERR-S>ERR-T set up; If not, maintain satellite signal receiving pattern; If so, switch to ground signal receiving mode.
4. receiver signal changing method as claimed in claim 1, is characterized in that, described ERR-T and ERR-S comprise bit error rate or the Packet Error Ratio of error sign ratio, bit error rate, ISN or outer code decoder after demapping.
5. a receiver, its inside comprises ground signal receiver module, satellite signal receiving module and signal handover module, described ground signal receiver module corresponding ground signal receiving modes, the corresponding satellite signal receiving pattern of described satellite signal receiving module, is characterized in that:
Default TH-T and TH-S in signal handover module, wherein TH-T is the error threshold that ground signal receives, TH-S is the error threshold of satellite signal receiving;
The pattern of described signal handover module judgement receiver operation;
Ground signal receiver module generates ERR-T, and satellite signal receiving module generates ERR-S; According to the pattern of receiver operation, signal handover module utilizes and relatively judges whether running mode switching of receiver between ERR-T, TH-T, ERR-S, TH-S, wherein ERR-T represents the accurate prediction of signal error rates that ground signal receives, and ERR-S represents the accurate prediction of signal error rates of satellite signal receiving.
6. receiver as claimed in claim 5, is characterized in that, described receiver is carried out following operation under ground signal receiving mode:
Described ground signal receiver module generates ERR-T;
Described signal handover module judges whether ERR-T≤TH-T sets up, if set up, maintains ground signal receiving mode;
If be false, satellite signal receiving module generates ERR-S;
Signal handover module continues to judge whether ERR-S>TH-S sets up, if set up, maintains ground signal receiving mode;
If be false, signal handover module switches to satellite signal receiving pattern by receiver.
7. receiver as claimed in claim 5, is characterized in that, described receiver is carried out following operation under satellite signal receiving pattern:
Ground signal receiver module generates ERR-T, and satellite signal receiving module generates ERR-S;
Signal handover module judges whether ERR-S>TH-S or ERR-S>ERR-T set up, and if not, receiver is maintained to satellite signal receiving pattern; If so, receiver is switched to ground signal receiving mode.
8. receiver as claimed in claim 5, is characterized in that, described ERR-T and ERR-S comprise bit error rate or the Packet Error Ratio of error sign ratio, bit error rate, ISN or outer code decoder after demapping.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310344423.0A CN103546705B (en) | 2013-08-09 | 2013-08-09 | Receiver signal changing method and the receiver of correspondence |
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| CN201310344423.0A CN103546705B (en) | 2013-08-09 | 2013-08-09 | Receiver signal changing method and the receiver of correspondence |
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| CN103546705A true CN103546705A (en) | 2014-01-29 |
| CN103546705B CN103546705B (en) | 2016-12-28 |
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| US20030064680A1 (en) * | 2001-10-01 | 2003-04-03 | Susumu Ohsawa | Apparatus and method for receiving transmit wave |
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| CN1980399A (en) * | 2005-12-05 | 2007-06-13 | 三星电子株式会社 | Apparatus and method for providing digital multimedia breadcasting service in area of weak current |
| CN101521769A (en) * | 2009-04-15 | 2009-09-02 | 四川长虹电器股份有限公司 | System for simultaneously receiving ground wave and satellite digital television |
| EP2400750A1 (en) * | 2009-02-23 | 2011-12-28 | Panasonic Corporation | Television receiver |
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2013
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030064680A1 (en) * | 2001-10-01 | 2003-04-03 | Susumu Ohsawa | Apparatus and method for receiving transmit wave |
| CN1697499A (en) * | 2004-05-12 | 2005-11-16 | 三星电子株式会社 | Apparatus and method for receiving digital multimedia broadcasting in a wireless terminal |
| US20070117506A1 (en) * | 2005-06-28 | 2007-05-24 | Samsung Electronics Co., Ltd | Dual mode DMB terminal capable of simultaneously receiving satellite DMB and terrestrial DMB |
| CN1980399A (en) * | 2005-12-05 | 2007-06-13 | 三星电子株式会社 | Apparatus and method for providing digital multimedia breadcasting service in area of weak current |
| EP2400750A1 (en) * | 2009-02-23 | 2011-12-28 | Panasonic Corporation | Television receiver |
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Address after: Room 1018, block B, No. three East Bridge Road, Pudong New Area, Shanghai, 200125, China Applicant after: Shanghai NERC-DTV National Engineering Research Center Co., Ltd. Address before: 200125 Shanghai East Road, Pudong New Area, No. three, No. 1018 Applicant before: Shanghai NERC-DTV National Engineering Research Center Co., Ltd. |
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Inventor after: Xiong Jian Inventor after: Yang Hua Inventor after: Lu Jingkan Inventor after: Gui Lin Inventor after: Liu Bo Inventor before: Xiong Jian Inventor before: Yang Hua Inventor before: Lu Jingkan Inventor before: Gui Lin Inventor before: Liu Bo Inventor before: Ma Wenfeng |