CN101061706B - Method for improving image stability of mobile analog TV reception - Google Patents
Method for improving image stability of mobile analog TV reception Download PDFInfo
- Publication number
- CN101061706B CN101061706B CN200680001237.5A CN200680001237A CN101061706B CN 101061706 B CN101061706 B CN 101061706B CN 200680001237 A CN200680001237 A CN 200680001237A CN 101061706 B CN101061706 B CN 101061706B
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- China
- Prior art keywords
- signal
- synchronizing signal
- received
- quality evaluation
- synthetic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/12—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising
- H04N5/126—Devices in which the synchronising signals are only operative if a phase difference occurs between synchronising and synchronised scanning devices, e.g. flywheel synchronising whereby the synchronisation signal indirectly commands a frequency generator
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6106—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network
- H04N21/6131—Network physical structure; Signal processing specially adapted to the downstream path of the transmission network involving transmission via a mobile phone network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
Abstract
To enable a user to retrieve a fixed phrase or sentence including a plurality of his desired words by performing a simple operation that does not take time.The user uses an operating part 31 to direct designate a plurality of respective words in one sentence or more displayed on a display part 32 on a screen regardless of the continuous arrangement or discontinuous arrangement of the sentences. Then, a recognizing part 34 recognizes a plurality of words designated by the user on the basis of operation contents of the operating part 31 and notifies a retrieving part 35 of the recognition result. The retrieving part 35 retrieves a fixed phrase and an example including the plurality of notified words or text about them from a dictionary storing part 36 and supplies the fixed phase or the example or the text to a display control part 33. The display control part 33 displays the supplied fixed phrase and example or text about them on the display part 32. This invention is applicable to an information processor having a dictionary function.
Description
Technical field
The present invention relates to a kind of according to claim 1 preamble feature be used to improve mobile analog TV and receive the time picture steadiness method, wherein mobile analog TV receives and utilizes receiving system, as at least one antenna and a receiver.
Background technology
(the coloured image blanking is synchronous: Farb-Bild-Austast-Synchron) the direct use of signal is the basis to the known method that is used for move receiving anolog TV signals with the FBAS that receiver was provided that is made of tuner and demodulator basically.Wherein, adopt different deversity schemes, as switch diversity (Schalt-Diversity) (DE3926336A1, DE19636125A1, DE19739898A1) or the summation diversity (Summations-Diversity) (DE19929284A1).Therefore, when the condition of acceptance difference, be received and also may in synchronized component, be had interference by the FBAS signal of demodulation subsequently although these deversity schemes can be by a plurality of antenna receiving signals and can further be handled the signal of optimum reception respectively.
For the correct television image that shows, must there be undisturbed synchronizing signal.But directly both of these case-motion or other effect owing to automobile is subjected to strong interference usually for the FBAS signal that receives when incoming level is very low or when existing multipath to disturb (Mehrwegestoerung)-exist in mobile TV receives.Then, this FBAS signal that is interfered causes image disruption, as level and/or vertical sweep (Durchlaufen) or image deviations, and causes not enough television reception quality thus.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is, this method is improved in weak supply (versorgten) area with the low technical cost and is had mobile land television reception in the area of multipath transmisstion, makes the stability of obviously improving image synchronization with respect to known receiving system.
This technical problem solves by the feature of claim 1.
According to the present invention, the local conclusive synchronizing signal that is included in the TV signal that produces synthetically in receiver, wherein the synchronizing signal that is received when condition of acceptance is good is used for the synthetic synchronizing signal that generates in this locality is carried out the synchronous of frequency and phase place, and when condition of acceptance is relatively poor, the synthetic synchronizing signal that produces irrespectively moves on high frequency stability with the synchronizing signal that is received, and is used for further signal processing.Method of the present invention causes the image disruption of level and/or vertical sweep or picture displacement form-as when mobile TV receives, especially receive the image disruption that area and multipath reception area occurred-significantly reduce in weak signal.
For the transportation simulator TV signal, modulation so-called FBAS signal (CVBS: composite video impulsive synchronization, composite video burst sync) on carrier signal.The main component of FBAS signal is brightness (briliancy) information and color (colourity) information and the corresponding blanking information of image to be displayed, and blanking information is called as synchronizing signal below.This synchronizing signal not only comprises vertical blanking information but also comprise horizontal blanking information.The signal form of this synchronizing signal (Signalform) is to determine for given television standard, comprises repetition rate and waviness tolerance thereof.
If when (land) of TV signal transmission, the interference of synchronizing signal occurs, thus can not be correctly to the blanking information decoding, and then this causes showing mistake.According to the signal processing of receiver, possible level and/or moving television image vertically, perhaps the blanking information of decoded in error in image as (noisy) black hachure (Balken) but visible.In addition, the displacement or the position of (noisy) black hachure may change along with the time, and caused the scanning of image or hachure.
The present invention based on principle be to produce conclusive synchronizing signal in this locality.Because the signal wave form of this synchronizing signal is known, so only also must make all the other free parameter-frequencies and phase place-mate with received signal.This carries out when condition of acceptance is good, wherein can carry out error-free decoding to synchronizing signal.For this reason, in a preferred implementation, use tracking lock unit (phase-locked loop, PLL).
Follow the tracks of lock unit and have such characteristic, promptly regulate the frequency and the phase place of oscillator, make that its frequency and phase place with reference oscillator is consistent.When condition of acceptance is relatively poor, continues to use local synchronizing signal, and do not use the synchronizing signal that is received.Wherein, importantly, realize moving on of synchronizing signal that a subsynchronous this locality produces with the very high stability of determined frequency when the good condition of acceptance.
Also provide other effect and the advantage of the inventive method in the dependent claims.
Description of drawings
Introduce below and explain embodiments of the invention, but the invention is not restricted to these embodiment by Fig. 1 to Fig. 6.
In Fig. 1, in synchronous separating unit, from the FBAS signal FBAS_1 that is received, synchronized component (representing with CSYNC_1) and brightness and color signal (representing with FBAS_2) are separated.The synchronized component of the FBAS signal that the synchronizing generator analysis of frequency and phase variable is received, be signal CSYNC_1, and generate local synchronizing signal CSYNC_2, this this locality synchronizing signal is equilibrium when condition of acceptance is good (angleichen) input signal CSYNC_1 as mentioned above, but irrespectively moves on when condition of acceptance is relatively poor.In synchronous keying unit subsequently, in synthetic synchronizing signal CSYNC_2 the keying input is received again the brightness and color signal FBAS_2, so that regenerate complete FBAS output signal FBAS_3.The amplitude and the phase place of the synchronized component of the FBAS signal that is received can be used to quality evaluation.Quality evaluation also can be carried out by means of chrominance pulse.
A preferred and application cheaply of the method for independent claims has been shown among Fig. 2.In the characteristic (quality evaluation of input signal of synchronizing generator that this adopted except having described, produce and mate phase place and frequency in case of necessity) outside, can also be switched on or switched off the synthetic synchronizing signal (representing) that is produced according to the quality of determined its input signal FBAS_2 with CSYNC.Switchable synthetic synchronizing signal directly is input among the FBAS signal FBAS_1 that is received by keying in the method, and consequent output signal FBAS_2 is used to further signal processing.This method is feasible can directly further to adopt the FBAS signal that is received when condition of acceptance is good, and effective synchronizing information is provided in signal FBAS_2 when condition of acceptance is relatively poor.The advantage of this method is, can reduce circuit cost when realizing with respect to the method for Fig. 1.
Figure 3 illustrates method of the present invention and can how to increase antenna duplexer.This antenna duplexer makes an antenna in a plurality of possibility antennas can be connected to RX path, and realizes so-called switch diversity thus.The advantage of this method is that antenna duplexer can be realized based on the quality evaluation of carrying out always to received signal equally.This has another advantage, promptly selects each to produce the antenna of optimized image stability.In principle, can increase antenna duplexer according to Fig. 1 and described two distortion of Fig. 2.
Fig. 4 illustrates the synchronism stability method that has follow-up Digital Signal Processing according to of the present invention.Wherein, the FBAS signal FBAS_3 after stable is converted into digital video signal (with " digital video signal _ 1 " expression) in the video simulation digital quantizer.Then, handle this digital video signal, provide as " digital video signal _ 2 " then with digital signal processing method.
The low cost of the method according to this invention shown in Figure 5 in Digital Signal Processing realizes.Its advantage is that digital signal processing unit is also born the task of the synchronizing generator that can switch on and off.That is to say that it on the one hand carries out quality evaluation by means of digital video signal (digital video signal _ 1), on the other hand by means of the synchronizing signal of this digital signal processing unit generated frequency and phase variable.
Fig. 6 illustrates the RX path that the method according to this invention expands to a plurality of parallel enforcements, as for example in according to the diversity receiver of open source literature DE19929284A1.Wherein, all paths are directed into a public number signal processing unit.Its make can more single path quality evaluation, and be not only based on self quality evaluation and the quality evaluation that is based on all RX path decides switching on and off of each synthetic synchronizing signal (CSYNC_1 to CSYNC_N).
Embodiment
A preferred structure of this method is, only connects N synchronizing signal of the best in the possibility synchronizing signal when condition of acceptance is relatively poor.Therefore, the quality evaluation of all other N-1 possibility RX path is carried out by means of not affected received signal.This has simplified quality evaluation greatly, and has therefore reduced false assessment and consequent to switching on and off the risk of the false judgment of synthesizing synchronizing signal.
Claims (15)
1. method that is used to improve the picture steadiness that mobile simulated television receives, wherein said mobile simulated television receives and utilizes receiving system, it is characterized in that, the local decisive synchronizing signal that is included in the TV signal that generates synthetically in receiver, wherein the synchronizing signal that is received when condition of acceptance is good is used to the synthetic synchronizing signal that generates in this locality is carried out the synchronous of frequency and phase place, and the synthetic synchronizing signal that produces irrespectively moves on the stability of determined frequency when condition of acceptance is good with the synchronizing signal that is received when condition of acceptance is relatively poor, and is used for further signal processing.
2. method according to claim 1, it is characterized in that, the synchronized component of the FBAS signal that is received is separated in synchronous separating unit, and position at described synchronous separating unit, the synthetic synchronized component that produces is added in the synchronous keying unit, thereby provides complete FBAS signal as output signal again.
3. method according to claim 1, it is characterized in that, the synthetic synchronizing signal that produces in described this locality can optionally be switched on or disconnect, but directly be input in the FBAS signal that is received by keying, and consequent composite signal is as output signal, and not only be used to the local synchronously synthetic synchronizing signal that produces, but also be carried out quality evaluation, the on/off of synthetic synchronizing signal is controlled in wherein said quality evaluation again.
4. according to each described method in the claim 1 to 3, it is characterized in that, high-frequency change over switch is controlled like this by means of the quality evaluation of input signal in the unit that is used to produce local synchronizing signal, makes each produce the aerial signal and RX path connection of best in quality assessment.
5. method according to claim 2 is characterized in that the amplitude and the phase place of the synchronized component of the FBAS signal that is received are used to quality evaluation.
6. method according to claim 5 is characterized in that described quality evaluation is carried out by means of chrominance pulse.
7. according to each described method in the claim 1 to 3, it is characterized in that, the synchronizing generator unit that is used to produce local synchronizing signal comprises the tracking lock unit, so that make the frequency and the phase place equilibrium mutually of the frequency of the local synchronizing signal that produces and phase place and the synchronizing signal that is received.
8. method according to claim 3 is characterized in that the output signal that is produced is converted into digital video signal, and is imported into digital signal processing unit.
9. according to each described method in the claim 1 to 3, it is characterized in that, in digital signal processing unit, realize the generation of the synthetic synchronizing signal in described this locality.
10. according to each described method in the claim 1 to 3, it is characterized in that, in the multi-receiver system, implement N corresponding RX path concurrently.
11. method according to claim 10 is characterized in that, realizes needed quality evaluation at a common signal processing unit, thereby can compare each RX path.
12. method according to claim 11 is characterized in that, whenever only connects the synthetic synchronizing signal that produces in a this locality at most, and thus for all other RX path, carries out necessary quality evaluation by means of unaffected received signal.
13. method according to claim 1, wherein said receiving system are at least one antenna and a receiver.
14. method according to claim 7, wherein said tracking lock unit is a phase-locked loop.
15. circuit setting that is used to carry out according to one of aforesaid right requirement described method.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005021750.8 | 2005-05-11 | ||
| DE102005021750 | 2005-05-11 | ||
| PCT/EP2006/004456 WO2006120000A1 (en) | 2005-05-11 | 2006-05-11 | Method for improving image stability of mobile analog tv reception |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101061706A CN101061706A (en) | 2007-10-24 |
| CN101061706B true CN101061706B (en) | 2010-12-01 |
Family
ID=37011939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200680001237.5A Expired - Fee Related CN101061706B (en) | 2005-05-11 | 2006-05-11 | Method for improving image stability of mobile analog TV reception |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1880542A1 (en) |
| CN (1) | CN101061706B (en) |
| WO (1) | WO2006120000A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0281169A1 (en) * | 1987-02-04 | 1988-09-07 | Koninklijke Philips Electronics N.V. | Line synchronising circuit in a picture display device |
| US5335010A (en) * | 1991-02-08 | 1994-08-02 | U.S. Philips Corporation | Antenna diversity receiving system with antenna switching during line periods and signal quality evaluation during line blanking intervals |
| DE19925868A1 (en) * | 1999-06-07 | 2001-01-11 | Temic Telefunken Hochfrequenzt | Diversity TV reception system generates separate control signals using phase error between individual and combined output signals, controls signal phase of each auxiliary receiver signal |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2835732A (en) * | 1951-06-22 | 1958-05-20 | Zenith Radio Corp | Sync separator comprising electromechanical resonant line |
| US3527886A (en) * | 1967-03-30 | 1970-09-08 | Rca Corp | Composite television video switching circuit |
| JP2728547B2 (en) * | 1990-06-13 | 1998-03-18 | 株式会社日立製作所 | Diversity receiver |
| US5162910A (en) * | 1990-10-03 | 1992-11-10 | Thomson Consumer Electronics, Inc. | Synchronizing circuit |
| DE19636125B4 (en) * | 1996-09-06 | 2007-12-06 | Fuba Automotive Gmbh & Co. Kg | Space diversity method and circuitry |
| DE19929284A1 (en) * | 1999-06-25 | 2001-01-04 | Hirschmann Richard Gmbh Co | Method for the mobile reception of radio signals and circuit arrangement for carrying out the method |
-
2006
- 2006-05-11 CN CN200680001237.5A patent/CN101061706B/en not_active Expired - Fee Related
- 2006-05-11 EP EP06753575A patent/EP1880542A1/en not_active Withdrawn
- 2006-05-11 WO PCT/EP2006/004456 patent/WO2006120000A1/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0281169A1 (en) * | 1987-02-04 | 1988-09-07 | Koninklijke Philips Electronics N.V. | Line synchronising circuit in a picture display device |
| US5335010A (en) * | 1991-02-08 | 1994-08-02 | U.S. Philips Corporation | Antenna diversity receiving system with antenna switching during line periods and signal quality evaluation during line blanking intervals |
| DE19925868A1 (en) * | 1999-06-07 | 2001-01-11 | Temic Telefunken Hochfrequenzt | Diversity TV reception system generates separate control signals using phase error between individual and combined output signals, controls signal phase of each auxiliary receiver signal |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1880542A1 (en) | 2008-01-23 |
| CN101061706A (en) | 2007-10-24 |
| WO2006120000A1 (en) | 2006-11-16 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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Granted publication date: 20101201 Termination date: 20190511 |