CN100417184C - Method and device for detecting synchronous signal - Google Patents
Method and device for detecting synchronous signal Download PDFInfo
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- CN100417184C CN100417184C CNB2004100475416A CN200410047541A CN100417184C CN 100417184 C CN100417184 C CN 100417184C CN B2004100475416 A CNB2004100475416 A CN B2004100475416A CN 200410047541 A CN200410047541 A CN 200410047541A CN 100417184 C CN100417184 C CN 100417184C
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- digital broadcast
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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
- H04N5/08—Separation of synchronising signals from picture signals
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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
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention relates to a detecting device of synchronous signals applicable to receive segment synchronous signals, field synchronous signals and digital broadcasting signals of data; and detect the segment synchronous signal and the field synchronous signal from the signals. The invention comprises: a correlation calculator which calculates the correlation between the received digital broadcasting signal and the predetermined reference signal to detect the position of the field synchronous signal contained in the digital broadcasting signal; and a counter which counts the predetermined times at the detecting position of the field synchronous signal to estimate the count carry value as the segment synchronous signal producing point and output the segment synchronous detecting signal. Because the device detects the field synchronous signal and then uses the coefficient multiplier to estimate the segment synchronous signal, the hardware implementation can be simplified. Because the detection comprises the segment synchronous signals of a large number of code elements, and the counter is used to estimate the segment synchronous signals of a small amount of code elements, the synchronous signal can be detected conveniently. In addition, even though under the condition of mobile communication, the field and the segment synchronous signals can be detected easily.
Description
Technical field
The present invention relates to the device of the detection synchronizing signal in a kind of digital broadcasting signal receiver.Especially, the present invention relates to can be under the mobile communication situation and the change places device of detection synchronizing signal of field sync signal of signal fading badly area contents.
Background technology
Along with the unification and the multimedization of communication, computer and broadcasting, various countries are with existing analogue system digitization of broadcasting.Developed country is the U.S. for example, and the standards for digital broadcasting system has been prepared by Europe and Japan, and system's difference of various countries is difference to some extent.
ISDB-T (the land integrated service digital broadcasting) system of DVB-T (terrestrial digital television broadcasting) system in the ATSC of the U.S. (alliance of Advanced Television system) system, Europe and Japan has represented the standards for digital broadcasting system.
The ATSC system uses single carrier 8-VSB (residual sideband) modulating system, has the transfer rate of 19.39Mbps in the 6MHz bandwidth.The ATSC system with analogue system radio hookup situation simultaneously under almost do not have cochannel to disturb, its advantage is simple and receiver is cheap to hardware requirement.ADTB-T (Advanced Digital Television Broadcasting-Terrestrial, the advanced digital television broadcasting in land) system with the ATSC system similarity has been proposed recently.ADTB-T system support list/mixed transmission modes has also been used OQAM (offset orthogonal which amplitude modulation).
Fig. 1 is expression is sent to the data frame structure of receiving terminal from transmitting terminal the diagrammatic sketch of example.
In the Frame that comprises 836 code elements, the section of 13,26 or 52 code elements (segment) constitutes a field (field).Frame comprises two fields.First section of every is the synchronous field synchronization segments that is used for each.The field comprises field synchronization segments, a plurality of (for example 12) data and is used for the section of error correction.
Fig. 2 is the diagrammatic sketch of the detailed structure of field synchronization segments shown in the presentation graphs 1.
Field synchronization segments comprises 836 code elements: segment sync signal is used to the starting point of the section of indication; First pseudo noise sequence (PN 511); Second pseudo noise sequence (PN 253); Prepared separation comprises the additional information about the Frame that sends from transmitting terminal.
Segment sync signal comprises 8 code elements.First pseudo noise sequence (PN 511) and second pseudo noise sequence (PN 253) comprise 511 and 253 code elements respectively.
Fig. 3 is the diagrammatic sketch of the example of the expression device that detects synchronizing signal, and this device is particularly useful for detection segment synchronizing signal and field sync signal from have the digital broadcast signal with the Frame of same structure shown in Fig. 2.
Detect the device section of comprising synchronizing indicator 10, PN sequencer 20 and the correlator 30 of synchronizing signal.
In response to the detection signal (LOCK) that produces at section synchronizing indicator 10 places, the PN sequencer 20 that is used for the detection segment synchronizing signal sends pseudo noise sequence (PN sequence) to correlator 30.
Summary of the invention
Proposing the present invention is in order to solve the problem in the above-mentioned correlation technique.An aspect of of the present present invention provide a kind of can be under the mobile communication situation by the probability that improve to detect synchronizing signal and the change places device of detection synchronizing signal of field sync signal of signal fading badly area contents.
In order to realize above-mentioned several aspects of the present invention and/or other characteristics, a kind of device that detects synchronizing signal is provided, this device receives the digital broadcast signal that comprises segment sync signal, field sync signal and data, and from the digital broadcast signal that receives detection segment synchronizing signal and field sync signal, comprise: correlation calculator, be used to calculate the digital broadcast signal that receives and the correlation between the predetermined reference signal, be included in the position of the field sync signal in the digital broadcast signal with detection; Counter is used at the position of detected field sync signal counting pre-determined number, and will count carry value and be estimated as segment sync signal generation point, and the deferent segment synchronous detection signal.
The peaked point estimation that correlation calculator will have in the correlation that calculates is the generation point of field sync signal.
Predetermined reference signal is reached an agreement with the transmitting terminal that sends digital broadcast signal in advance, and has the pattern identical with field sync signal.
Correlation calculator comprises: first memory is used for receiving digital broadcast signal based on predetermined symbol unit storage; Second memory is used for storing predetermined reference signal; Multiplier is used for the reference signal and the digital broadcast signal that are stored in first memory and second memory are multiplied each other; Adder is used for based on predetermined symbol unit addition multiplication result; Maximum value detector, the peaked point estimation that is used for having a plurality of additive values is the generation point of field sync signal.
The additive value of correlation calculator increases along with the storing value similarity degree in first memory and the second memory.
According to a further aspect in the invention, the device that detects synchronizing signal receives and comprises segment sync signal, the digital broadcast signal of field sync signal and data, and from digital broadcast signal detection segment synchronizing signal and field sync signal, this device comprises: synchronized signal detector, the code element code that is used for comparison predetermined reference pseudo noise sequence and digital broadcast signal, and be mapped as in first value and second value one, based on predetermined symbol unit addition mapping value, the peaked point estimation that will have in a plurality of mapping value is the generation point of field sync signal, and produces the field synchronization detection signal; Counter is used for the inspection positions counting pre-determined number in field sync signal, and will count carry value and be estimated as segment sync signal generation point, and the deferent segment synchronous detection signal.
Synchronized signal detector comprises: mapper is used for being mapped as first value when predetermined reference pseudo noise sequence and digital broadcast signal have same code; Adder is used for based on predetermined symbol unit addition mapping value; Maximum value detector, the peaked point estimation that is used for having a plurality of additive values is the generation point of field sync signal, and produces the field synchronization detection signal.
Reference signal is reached an agreement with the transmitting terminal that sends digital broadcast signal in advance, and has the pattern identical with field sync signal.
According to a further aspect in the invention, provide a kind of from the digital broadcast signal that comprises segment sync signal, field sync signal and data the method for detection segment synchronizing signal and field sync signal, comprise the steps: to calculate the correlation between digital broadcast signal and the predetermined reference signal, and detect the position that is included in the field sync signal in the digital broadcast signal; At the inspection positions counting pre-determined number of field sync signal, and recover segment sync signal.
The step of the position of field sync signal comprises the steps: based on predetermined symbol unit reference signal to be multiply by digital broadcast signal, the addition multiplication result; And the peaked point estimation that will have in a plurality of additive values is the generation point of field sync signal.
Reference signal is reached an agreement with the transmitting terminal that sends digital broadcast signal in advance, and has the pattern identical with field sync signal.
According to a further aspect in the invention, provide a kind of from the digital broadcast signal that comprises segment sync signal, field sync signal and data the method for detection segment synchronizing signal and field sync signal, comprise the steps: when the code element in the code element of digital broadcast signal has the corresponding code of code with the reference pseudo noise sequence of preparing at receiving terminal, be mapped as in first value and second value, based on predetermined symbol unit addition mapping value, and determine to have peaked generation point in a plurality of additive values as field sync signal; And will be the generation point of segment sync signal from the point estimation of determining some counting pre-determined number.
The step of determining field sync signal generation point comprises: compare the code element code with reference to pseudo noise sequence and digital broadcast signal, first value is composed to having and code element with reference to the corresponding code of code of pseudo noise sequence, second value is composed to the code element that has not with the corresponding code of code of reference pseudo noise sequence; Based on being scheduled to the absolute value that the symbol unit addition calculation goes out; And the peaked point estimation that will have in a plurality of additive values is the generation point of field sync signal.
Description of drawings
In conjunction with the drawings the preferred embodiments of the present invention are described in detail, above-mentioned aspect of the present invention and other characteristics will become apparent, wherein:
The diagrammatic sketch of Fig. 1 is illustrated in the example that is sent to the data frame structure of receiving terminal in the ATDB-T system from transmitting terminal;
Fig. 2 is the details drawing of the structure of field synchronization segments shown in the presentation graphs 1;
Fig. 3 is the conventional apparatus of detection segment synchronizing signal and field sync signal from the Frame with structure shown in Fig. 2;
Fig. 4 is the schematic diagram of expression according to the example of the device of the detection synchronizing signal of the embodiment of the invention;
Fig. 5 is the more detailed block diagram of correlator shown in Figure 4;
Fig. 6 A inputs to the digital broadcast signal of correlator and the unmatched diagrammatic sketch of reference pseudo noise sequence of preparation for expression;
Fig. 6 B inputs to the digital broadcast signal and the diagrammatic sketch that mates with reference to pseudo noise sequence of correlator for expression;
Fig. 7 is the block diagram according to the device of the detection synchronizing signal of the embodiment of the invention;
Fig. 8 A and Fig. 8 B are the oscillograms of the mapping of mapper shown in the key-drawing 7;
Fig. 9 is the flow chart of expression according to the method for the detection synchronizing signal of the embodiment of the invention; With
Figure 10 is the flow chart of expression according to the method for the detection synchronizing signal of the embodiment of the invention.
Embodiment
Below, embodiments of the present invention is described in detail with reference to accompanying drawing.
Fig. 4 is the schematic diagram of the embodiment of the expression device that detects synchronizing signal.
See figures.1.and.2, the device that detects synchronizing signal comprises correlator 50 sum counters 60.
Fig. 5 is the more detailed block diagram of correlator 50 among Fig. 4.
Correlator 50 comprises first memory 51, second memory 52, multiplier 53, adder 54 and maximum value detector 55.
When the digital broadcast signal in being stored in first memory 51 is sent to multiplier 53, second memory 52 stored reference pseudo noise sequences (R_PN), and the reference pseudo noise sequence (R_PN) of transmission storage is to multiplier 53.
Peaked generation point in the addition result of peak detector 55 definite generation adders 54 as field sync signal.
Fig. 6 A for expression be sent to the digital broadcast signal in of correlator 50 with reference to the unmatched schematic diagram of pseudo noise sequence (R_PN), digital broadcast signal in that Fig. 6 B is sent to correlator 50 for expression and schematic diagram with reference to pseudo noise sequence (R_PN) coupling.
When first pseudo noise sequence (PN 511) of the digital broadcast signal in that is sent to correlator 50 and the reference pseudo noise sequence of preparing at receiving terminal (R_PN) when not matching, correlation is converted into zero.On the contrary, when first pseudo noise sequence (PN 511) of the digital broadcast signal in that is sent to correlator 50 was mated with the reference pseudo noise sequence of preparing at receiving terminal (R_PN), correlation became its maximum " 511 ".
Fig. 7 is the block diagram that detects the device of synchronizing signal according to another embodiment of the present invention.
The device that detects synchronizing signal is available when the digital broadcast signal in that sends from transmitting terminal has code "+1 " and " 1 ".This device comprises synchronized signal detector 70 sum counters 80.
Digital broadcast signal in that synchronized signal detector 70 relatively sends out and the reference pseudo noise sequence of preparing at receiving terminal (R_PN), "+1 " is composed to the code element that comprises same code, addition (for example is scheduled to symbol unit, 511 code elements), to produce peaked point estimation is the generation point of field sync signal (for example PN 511), and output field synchronous detection signal (sync).Therefore, synchronized signal detector 70 does not need to have the multiplier of complex hardware structure, and can reduce field sync signal (for example PN 511) the required time.
Synchronized signal detector 70 can comprise mapper 71, adder 72 and peak detector 73.
When matching each other when the code element of digital broadcast signal in with reference to the code of the code element of pseudo noise sequence (R_PN), mapper 71 assignment "+1 ".Otherwise, mapper 71 assignment " 1 ".Therefore, mapper 71 can calculate with reference to the correlation between pseudo noise sequence (R_PN) and the digital broadcast signal in, and does not need an independent multiplier.
Fig. 8 A and Fig. 8 B are the oscillograms of the mapping process of mapper in the presentation graphs 7.
Fig. 8 A has provided the waveform of the digital broadcast signal in that sends.Two code elements that are expressed as "+1 " and " 1 " code are shown among the digital broadcast signal in.Usually, the digital broadcast signal that meets ATSC or ADTB-T system comprises 8 level signals.This 8 level signal comprises 4 positive levels and 4 negative levels respectively.
When the reference pseudo noise sequence (R_PN) that is sent to mapper 71 had identical code and phase place with digital broadcast signal in, mapper 71 was the symbol mapped of digital broadcast signal in+1, shown in Fig. 8 B.Compare with traditional processing method, the advantage of this processing method is can calculate correlation in a short period of time and need not use multiplier, if this multiplier uses hardware approach to realize usually then can occupy very large space; And traditional processing method is: correlator calculates correlation according to predetermined symbol unit with additive value phase Calais then with reference pseudo noise sequence multiplier word broadcast singal in.
Fig. 9 is the flow chart of expression according to the method for the detection synchronizing signal of the embodiment of the invention.
Calculate digital broadcast signal in and the correlation (S100) between the reference pseudo noise sequence (R_PN) that receiving terminal is prepared.Can be included in first pseudo noise sequence (PN 511) from the digital broadcast signal in that transmitting terminal sends and one or two (referring to Fig. 2) of second pseudo noise sequence (PN253) in the reference pseudo noise sequence (R_PN) that receiving terminal is prepared, and definite by reaching an agreement between transmitting terminal and the receiving terminal.Describe embodiments of the invention based on following situation, that is, have the identical pattern of first pseudo noise sequence (PN 511) with digital broadcast signal in reference to pseudo noise sequence (R_PN).Owing to when calculating correlation, 511 code elements are arranged, so digital broadcast signal in also needs 511 code elements with reference to pseudo noise sequence (R_PN).Correlator 50 calculates with reference to the correlation between 511 code elements of the digital broadcast signal in of pseudo noise sequence (R_PN) and order input, when the phase place of digital broadcast signal in and code element code are 511 with calculating the correlation maximum with reference to the phase place of pseudo noise sequence (R_PN) when identical with the code element code.
Then, the location estimation that will have a maximum correlation is the generation point (S110) of field sync signal (sync).Correlator 50 produces the field synchronization detection signal (sync) of the detection that is used to indicate field sync signal.
Figure 10 is the flow chart that detects the method for synchronizing signal according to another embodiment of the present invention.
The code of the value of the code element of digital broadcast signal in and the code element of the reference pseudo noise sequence of preparing at receiving terminal (R_PN) is compared (S200).The code element of digital broadcast signal in has "+1 " or " 1 " code.Similarly, the code element of the reference pseudo noise sequence of preparing at receiving terminal (R_PN) also has "+1 " or " 1 " code.Then, each code element that is sent to the digital broadcast signal in of mapper 71 is compared (S210) with the reference pseudo noise sequence (R_PN) with 511 symbol unit.At this moment, each code element of digital broadcast signal in and the reference pseudo noise sequence (R_PN) of same position are compared.According to result relatively, have with code element and be mapped as+1 (S220), be not mapped as-1 (S230) and do not have with code element with reference to the digital broadcast signal in of the identical code element code of pseudo noise sequence with reference to the digital broadcast signal in of the identical code element code of pseudo noise sequence.
Based on predetermined code element unit of quantity (such as 511 code elements) addition mapping value, and determine to have peaked element position in a plurality of additive values as the position (S250) of field sync signal.At last, based on the code element of the position counting predetermined quantity of field sync signal, and estimate the position (S260) of segment sync signal.For example, as shown in Figure 2, the segment sync signal that comprises 8 symbol size when the frame of digital broadcast signal in successively, first pseudo noise sequence of 511 symbol size (PN 511), second pseudo noise sequence of 253 symbol size (PN 253), during with the system information (reservation) of 64 symbol size, and when the reference pseudo noise sequence of preparing at receiving terminal (R_PN) has the pattern identical with first pseudo noise sequence (PN 511), 836 code elements of counter 80 countings, and estimate: segment sync signal will produce the summation of second pseudo noise sequence that these 317 code elements are 253 symbol size and the system information (reservation) of 64 symbol size with the gap periods ground of 317 code elements.Therefore, a section synchronous detection signal (LOCK) of exporting from counter 80 is not based on the calculating of correlation, and is based on the position that estimates with reference to the field synchronization detection signal from synchronized signal detector 70 outputs.According to described several exemplary embodiment up to the present, can not need the independent complex hardware just can field sync signal and segment sync signal such as multiplier and section detector.In addition, therefore the section that do not detect 8 code elements that are difficult to receive under the mobile communication situation is easy to field sync signal and segment sync signal owing to detect that the field sync signal (as first pseudo noise sequence and second pseudo noise sequence) comprise up to a hundred code elements is estimated the position of segment sync signal.
As mentioned above, according to the present invention,, implements the field sync signal because, therefore can simplifying hardware to estimate segment sync signal by the coefficient of utilization multiplier such as counter.In addition, owing to detect the pseudo noise sequence that comprises a large amount of code elements, usage counter estimates to comprise the segment sync signal of a small amount of code element then, so synchronization signal detection becomes convenient.In addition, comprise that the field sync signal of a large amount of code elements estimates segment sync signal then because detect, so, even under the mobile communication situation also easily checkout area and segment sync signal.
Claims (12)
1. device that detects synchronizing signal, this device receive comprise the digital broadcast signal of segment sync signal, field sync signal and data and from the digital broadcast signal that receives detection segment synchronizing signal and field sync signal, comprising:
Correlation calculator is used to calculate the digital broadcast signal that receives and the correlation between the predetermined reference signal, is included in the position of the field sync signal in the digital broadcast signal with detection; With
Counter is used for the inspection positions counting pre-determined number in field sync signal, and carry value be will count and segment sync signal generation point and deferent segment synchronous detection signal will be estimated as,
Wherein, associated counter comprises multiplier, adder and maximum value detector, multiplier is used for described predetermined reference signal multiplier word broadcast singal, adder is used for based on predetermined symbol unit addition multiplication result, and the peaked point estimation that maximum value detector is used for having a plurality of additive values is the generation point of field sync signal.
2. the device of detection synchronizing signal as claimed in claim 1, wherein, the point estimation that correlation calculator will have maximum correlation is the generation point of field sync signal.
3. the device of detection synchronizing signal as claimed in claim 1, wherein, predetermined reference signal is reached an agreement with the transmitting terminal that sends digital broadcast signal in advance, and has the pattern identical with field sync signal.
4. the device of detection synchronizing signal as claimed in claim 1, wherein, associated counter also comprises:
First memory is used for the digital broadcast signal that receives based on predetermined symbol unit storage;
Second memory is used for storing predetermined reference signal.
5. the device of detection synchronizing signal as claimed in claim 4, wherein, the output of adder increases along with the similarity degree of the value of storing in first memory and the second memory.
6. device that detects synchronizing signal, this device receive comprise the digital broadcast signal of segment sync signal, field sync signal and data and from digital broadcast signal detection segment synchronizing signal and field sync signal, comprising:
Synchronized signal detector, the reference pseudo noise sequence that is used for relatively preparing and the code element code of digital broadcast signal, and correspondingly each code element of digital broadcast signal is mapped as in first value and second value one respectively, based on predetermined symbol unit addition mapping value, the peaked point estimation that will have in a plurality of additive values is the generation point of field sync signal, and produces the field synchronization detection signal; With
Counter is used at the generation position of detected field synchronization detection signal counting pre-determined number, and will count carry value and be estimated as segment sync signal generation point, and the deferent segment synchronous detection signal.
7. the device of detection synchronizing signal as claimed in claim 6, wherein, synchronized signal detector comprises:
Mapper is used for being mapped as first value when predetermined reference pseudo noise sequence and digital broadcast signal have same code;
Adder is used for based on predetermined symbol unit addition mapping value; With
Maximum value detector, the peaked point estimation that is used for having a plurality of additive values is the generation point of field sync signal, and produces the field synchronization detection signal.
8. the device of detection synchronizing signal as claimed in claim 6, wherein, predetermined reference signal is reached an agreement with the transmitting terminal that sends digital broadcast signal in advance, and has the pattern identical with field sync signal.
9. method that detects synchronizing signal, this method detects segment sync signal and the field sync signal in the digital broadcast signal that comprises segment sync signal, field sync signal and data, comprises the steps:
Calculate the correlation between digital broadcast signal and the predetermined reference signal, detect the position that is included in the field sync signal in the digital broadcast signal; With
At the inspection positions counting pre-determined number of field sync signal, and recover segment sync signal,
Wherein, the step of the position of field sync signal comprises based on predetermined symbol unit and described predetermined reference signal be multiply by the step of digital broadcast signal and addition multiplication result and the peaked point estimation that will have in a plurality of additive values is the step of the generation point of field sync signal.
10. the method for detection synchronizing signal as claimed in claim 9, wherein, described predetermined reference signal is reached an agreement with the transmitting terminal that sends digital broadcast signal in advance, and has the pattern identical with field sync signal.
11. a method that detects synchronizing signal, this method is detection segment synchronizing signal and field sync signal from the digital broadcast signal that comprises segment sync signal, field sync signal and data, comprises the steps:
When a code element of digital broadcast signal has corresponding code of code with the reference pseudo noise sequence of preparing at receiving terminal, with this symbol mapped of digital broadcast signal is in first value and second value one, based on predetermined symbol unit addition mapping value, and determine to have the generation point that peaked point is a field sync signal in a plurality of additive values; With
To be the generation point of segment sync signal from the point estimation of determining some counting pre-determined number.
12. the method for detection synchronizing signal as claimed in claim 11 wherein, determines that the step of field sync signal generation point comprises:
Relatively with reference to the code element code of pseudo noise sequence and digital broadcast signal, first value is composed to having and with reference to the code element of the corresponding code of code of pseudo noise sequence, second value being composed to the code element with not corresponding with the code of reference pseudo noise sequence code;
Based on being scheduled to the absolute value that the symbol unit addition calculation goes out; With
The peaked point estimation that will have in a plurality of additive values is the generation point of field sync signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030046104A KR20050006395A (en) | 2003-07-08 | 2003-07-08 | Method and Apparutus for detecting synchronization signal |
| KR200346104 | 2003-07-08 |
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| CN1578396A CN1578396A (en) | 2005-02-09 |
| CN100417184C true CN100417184C (en) | 2008-09-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07231279A (en) * | 1994-02-17 | 1995-08-29 | Nippon Signal Co Ltd:The | Synchronization detector for spread spectrum communication equipment |
| CN1152387A (en) * | 1995-06-09 | 1997-06-18 | 三星电子株式会社 | Apparatus and method for generating data segment sync signal |
| JP2002016511A (en) * | 2000-06-28 | 2002-01-18 | Japan Science & Technology Corp | Interference eliminating device, wireless terminal, and interference eliminating method |
| JP2002314520A (en) * | 2001-04-16 | 2002-10-25 | Matsushita Electric Ind Co Ltd | Method and device for frame synchronization |
| CN1380791A (en) * | 1996-01-12 | 2002-11-20 | 三星电子株式会社 | Device and method for checking field synchronous signal of high clarity TV |
-
2003
- 2003-07-08 KR KR1020030046104A patent/KR20050006395A/en not_active Application Discontinuation
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2004
- 2004-05-21 CN CNB2004100475416A patent/CN100417184C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07231279A (en) * | 1994-02-17 | 1995-08-29 | Nippon Signal Co Ltd:The | Synchronization detector for spread spectrum communication equipment |
| CN1152387A (en) * | 1995-06-09 | 1997-06-18 | 三星电子株式会社 | Apparatus and method for generating data segment sync signal |
| CN1380791A (en) * | 1996-01-12 | 2002-11-20 | 三星电子株式会社 | Device and method for checking field synchronous signal of high clarity TV |
| JP2002016511A (en) * | 2000-06-28 | 2002-01-18 | Japan Science & Technology Corp | Interference eliminating device, wireless terminal, and interference eliminating method |
| JP2002314520A (en) * | 2001-04-16 | 2002-10-25 | Matsushita Electric Ind Co Ltd | Method and device for frame synchronization |
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| Publication number | Publication date |
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| CN1578396A (en) | 2005-02-09 |
| KR20050006395A (en) | 2005-01-17 |
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