CN201207706Y - Electric level monitoring device for digital television signal - Google Patents
Electric level monitoring device for digital television signal Download PDFInfo
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- CN201207706Y CN201207706Y CNU2008200948606U CN200820094860U CN201207706Y CN 201207706 Y CN201207706 Y CN 201207706Y CN U2008200948606 U CNU2008200948606 U CN U2008200948606U CN 200820094860 U CN200820094860 U CN 200820094860U CN 201207706 Y CN201207706 Y CN 201207706Y
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Abstract
The utility model is applied to the technical field of telecommunications, providing an electrical level monitoring device of digital television signals. The monitoring device comprises a high frequency tuner which implements the frequency conversion and phase-locked loop processing to radio frequency signals of the digital television and outputs IF signals; a rectifier which is connected with the high frequency tuner and is used to rectify the IF signals and output the direct current electrical level; an A/D converter which is connected with the rectifier and is used to carry out the analog/digit conversion of the direct current electrical level and output the direct current electrical level in the form of digital signals; a display device which is used to display the monitoring result; and a central processor which is connected with the A/D converter, the display device and the high frequency tuner and is used to control the phase-locked loop processing of the high frequency tuner as well as the monitoring result displayed by the display device after receiving the direct current electrical level in the form of digital signals. The electrical level monitoring device of digital television signals is simply in structure, low in cost, thus reducing the costs of digital television manufacturers or cable television operators.
Description
Technical field
The utility model belongs to technical field of telecommunications, relates in particular to a kind of level monitoring device of digital television signal.
Background technology
Particularly cable digital TV is in the popularization of China along with Digital Television, and many cities and area are all transformed translation to Digital Television by simulated television.China plans to break simulated television in 2015 comprehensively, changes broadcast digital television.But digital cable TV is had relatively high expectations to signal, and when the digital television signal level that receives was low, mosaic may appear in digital television receiver, in addition can't demodulation etc. phenomenon.In order not influence the effect of watching of Digital Television, for cable television operators, just need be in the translation process, extensively use the input instrument continually, for example spectrum analyzer or field intensity meter come digital television signal is monitored, to ensure that digital television signal is in acceptability limit; For Digital Television manufacturer, just need make the sensitivity of the digital cable TV receiver that dispatches from the factory, consistency good, therefore, in the production process of digital television receiver, need a large amount of spectrum analyzers that use to monitor the digital television signal level in real time, and use attenuator to regulate the digital television signal level, digital television receiver is operated under the predetermined minimum level, thereby weeds out the undesirable digital television receiver of sensitivity.
Along with the development of Digital Television industry, the demand of signal monitoring apparatus such as spectrum analyzer, field intensity meter is also increasing.But, the cost of signal monitoring apparatus such as spectrum analyzer, field intensity meter is comparatively expensive, thereby caused the cost of Digital Television manufacturer and cable television operators higher, and the volume of signal monitoring apparatus such as spectrum analyzer, field intensity meter is bigger, is not easy to carry.Therefore, a kind of level monitoring device of lower-cost digital television signal need be provided.
In the maintenance of sensitivity, consistency check and the cable TV network of digital television receiver, not only need level monitoring, also need to use attenuator to regulate the digital television signal level.In practice examining and attended operation, operating personnel leave behind attenuator easily, and when needing output to set the signal of level, operating personnel also need to calculate attenuation according to monitoring result earlier, the attenuation of attenuator manually is set then, thereby operating process is comparatively complicated, causes the efficient checking, safeguard lower.
The utility model content
The purpose of this utility model is to provide a kind of level monitoring device of digital television signal, the cost that is intended to solve signal monitoring apparatus such as spectrum analyzer, field intensity meter is comparatively expensive, thereby has caused the cost problem of higher of Digital Television manufacturer and cable television operators.
For achieving the above object, the utility model provides a kind of level monitoring device of digital television signal, and described monitoring device comprises:
High-frequency tuner carries out frequency conversion and phase-locked loop processing, output intermediate-freuqncy signal to the radiofrequency signal of Digital Television;
Rectifier links to each other with high-frequency tuner, and described intermediate-freuqncy signal is carried out rectification, and output DC is flat;
A/D converter links to each other with rectifier, and described DC level is carried out mould/number conversion, the DC level of output digital signal form;
Display unit shows monitoring result; And
Central processing unit links to each other with analog to digital converter, display unit and high-frequency tuner, and the phase-locked loop of control high-frequency tuner is handled, and when receiving the DC level of digital signal form, the control display unit shows monitoring result.
In the utility model, utilize high-frequency tuner that the radiofrequency signal of Digital Television is carried out frequency conversion and phase-locked loop processing, the intermediate-freuqncy signal of output, rectifier carries out rectification to this intermediate-freuqncy signal, output DC is flat to carry out mould/number conversion to A/D converter by A/D converter, and the DC level of output digital signal form, thereby central processing unit can be controlled the DC level demonstration monitoring result of display unit according to this digital signal form.The level monitoring device of the digital television signal that the utility model embodiment provides not only can be realized the level monitoring function of digital television signal, and it is simple in structure, cost is comparatively cheap, thereby has solved Digital Television manufacturer or cable television operators owing to adopt comparatively expensive signal monitoring apparatus such as spectrum analyzer, field intensity meter to cause the cost problem of higher.
Description of drawings
Fig. 1 is the structural representation of the level monitoring device of the digital television signal that provides of the utility model first embodiment;
Fig. 2 is the structural representation of the level monitoring device of the digital television signal that provides of the utility model second embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
In the utility model, utilize high-frequency tuner that the radiofrequency signal of Digital Television is carried out frequency conversion and phase-locked loop processing, the intermediate-freuqncy signal of output, rectifier carries out rectification to this intermediate-freuqncy signal, output DC is flat to carry out mould/number conversion to A/D converter by A/D converter, and the DC level of output digital signal form, thereby central processing unit can be controlled the DC level demonstration monitoring result of display unit according to this digital signal form.The level monitoring device of the digital television signal that the utility model provides not only can be realized the level monitoring function of digital television signal, and cost is comparatively cheap, thereby has solved Digital Television manufacturer or cable television operators owing to adopt comparatively expensive signal monitoring apparatus such as spectrum analyzer, field intensity meter to cause the cost problem of higher.
Fig. 1 shows the structure of the level monitoring device of the digital television signal that the utility model first embodiment provides, and this level monitoring device comprises high-frequency tuner 101, rectifier 102, A/D converter 105, central processing unit 106, display unit 107.Wherein, A/D converter 105 can be integrated in the IC chip with central processing unit 106.This display unit 107 can be charactron or LCDs.
When high-frequency tuner 101 receives the radiofrequency signal of Digital Television, this radiofrequency signal is carried out frequency conversion and phase-locked loop processing, the intermediate-freuqncy signal of output fixed frequency is to rectifier 102.Wherein, the phase-locked loop processing procedure of high-frequency tuner 101 is passed through I by central processing unit 106
2The total line traffic control of C is finished.102 pairs of these intermediate-freuqncy signals of rectifier are carried out rectification, and the DC level after the output rectification.Because this DC level is an analog signal, 105 pairs of these DC level of A/D converter are carried out mould/number conversion, and the DC level of output digital signal form.Thereby central processing unit 106 can be controlled the DC level demonstration monitoring result of display unit 107 according to this digital signal form.
In order to strengthen the signal after the rectification, as embodiment of the present utility model, can be after rectifier 102, increase by an operational amplifier 104 before the A/D converter 105, utilize the DC level after 104 pairs of rectifications of this operational amplifier to amplify, and the input of the DC level after will amplifying A/D converter 105.
In order to make the signal after the rectification more pure, as embodiment of the present utility model, can be after rectifier 102, increase by a filter 103 before the operational amplifier 104, utilize the DC level after 103 pairs of rectifications of this filter to carry out filtering, export comparatively pure DC level to operational amplifier 104, so that the level monitoring result who obtains at last is more accurate.This filter 104 can be electric capacity.
The frequency of digital television signal and the input of other parameter for convenience, as embodiment of the present utility model, can in this level monitoring device, increase by an input equipment 108, the user can import the parameter of this level monitoring device, for example frequency of digital television signal by this input equipment 108.
Fig. 2 shows the structure of the level monitoring device of the digital television signal that the utility model second embodiment provides.The level monitoring device that second embodiment provides can increase attenuator unit 110 on the basis of the level monitoring apparatus structure that first embodiment provides, thereby not only can realize the level monitoring of digital television signal, and can carry out the control of level.And after having increased attenuator unit, correspondingly need to increase again a broadband splitter 109, the road radiofrequency signal that broadband splitter 109 will be imported wherein is divided into the two-way radiofrequency signal identical with the radiofrequency signal of this input, wherein one tunnel radiofrequency signal is exported to high-frequency tuner 101, and another road radiofrequency signal is exported to attenuator unit 110.
The user can directly be provided with the attenuation of attenuator unit 110 manually.At this moment, attenuator unit 110 decays to input radiofrequency signal wherein according to the attenuation of this setting.
When need be when the signal of level is set in attenuator unit 110 output, according to monitoring the level size of signal, and pass through I by central processing unit 106
2The C bus is controlled the attenuation of adjusting attenuator unit 110, thereby keeps output to set the signal of level.In this mode, dynamically adjust the attenuation of attenuator unit 110 by central processing unit 106.
This attenuator unit 110 can be an attenuator, and in order to enlarge attenuation range, as embodiment of the present utility model, this attenuator unit also can be the attenuator of a plurality of series connection uses.For the precision that makes decay is higher, as embodiment of the present utility model, the attenuator that is adopted can be the high-frequency digital attenuator.
In sum, in the utility model, utilize high-frequency tuner that the radiofrequency signal of Digital Television is carried out frequency conversion and phase-locked loop processing, the intermediate-freuqncy signal of output, rectifier carries out rectification to this intermediate-freuqncy signal, and output DC is flat to A/D converter, carry out mould/number conversion by A/D converter, and the DC level of output digital signal form, thereby central processing unit can be controlled the DC level demonstration monitoring result of display unit according to this digital signal form.The level monitoring device of the digital television signal that the utility model embodiment provides not only can be realized the level monitoring function of digital television signal, and it is simple in structure, cost is comparatively cheap, thereby has solved Digital Television manufacturer or cable television operators owing to adopt comparatively expensive signal monitoring apparatus such as spectrum analyzer, field intensity meter to cause the cost problem of higher.
In order on the basis of the level monitoring of digital television signal, further to realize can increasing level control attenuator unit at the level monitoring device, thereby avoid operating personnel to leave behind the problem of attenuator easily.Certainly, the attenuation of attenuator unit can be set manually, attenuator is decayed according to the attenuation of this setting.When the signal of level is set in needs output, by in real time the level of signal being monitored, central processing unit is according to the level of monitoring result and setting, calculate the attenuation that needs, and adjust attenuation in real time, guaranteeing that output sets the signal of level, thereby realize the automation that level is adjusted, improved the efficient of maintenance of sensitivity, consistency check and the cable TV network of digital television receiver.Because the structure of this level monitoring device is comparatively simple, makes its overall volume less, weight is lighter, has made things convenient for the user to carry and uses.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1, a kind of level monitoring device of digital television signal is characterized in that, described monitoring device comprises:
High-frequency tuner carries out frequency conversion and phase-locked loop processing, output intermediate-freuqncy signal to the radiofrequency signal of Digital Television;
Rectifier links to each other with high-frequency tuner, and described intermediate-freuqncy signal is carried out rectification, and output DC is flat;
A/D converter links to each other with rectifier, and described DC level is carried out mould/number conversion, the DC level of output digital signal form;
Display unit shows monitoring result; And
Central processing unit links to each other with analog to digital converter, display unit and high-frequency tuner, and the phase-locked loop of control high-frequency tuner is handled, and when receiving the DC level of digital signal form, the control display unit shows monitoring result.
2, device as claimed in claim 1 is characterized in that, described monitoring device also comprises:
Attenuator unit links to each other with central processing unit, by attenuation the level of the radiofrequency signal that receives is decayed.
3, device as claimed in claim 2 is characterized in that, described attenuator unit is the high-frequency digital attenuator of one or more series connection.
4, device as claimed in claim 2 is characterized in that, described monitoring device also comprises:
Broadband splitter, link to each other with high-frequency tuner and attenuator unit, the road radiofrequency signal that receives is divided into the two-way radiofrequency signal identical with described radiofrequency signal, and wherein one tunnel radiofrequency signal is exported to high-frequency tuner, and another road radiofrequency signal is exported to attenuator unit.
5, device as claimed in claim 1 is characterized in that, described monitoring device also comprises:
Filter links to each other with described rectifier, to rectifier output DC level carry out filtering, export filtered DC level.
6, device as claimed in claim 5 is characterized in that, described monitoring device also comprises:
Operational amplifier links to each other with described filter and A/D converter, the DC level of described filter output amplified, and the DC level after the output amplification.
7, device as claimed in claim 1 is characterized in that, described display device is charactron or LCDs.
8, device as claimed in claim 1 is characterized in that, described monitoring device also comprises:
Input equipment links to each other with central processing unit, the frequency of input digit TV signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200948606U CN201207706Y (en) | 2008-06-17 | 2008-06-17 | Electric level monitoring device for digital television signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200948606U CN201207706Y (en) | 2008-06-17 | 2008-06-17 | Electric level monitoring device for digital television signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201207706Y true CN201207706Y (en) | 2009-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200948606U Expired - Fee Related CN201207706Y (en) | 2008-06-17 | 2008-06-17 | Electric level monitoring device for digital television signal |
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| Country | Link |
|---|---|
| CN (1) | CN201207706Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102438168A (en) * | 2011-10-10 | 2012-05-02 | 北京广电天地信息咨询有限公司 | Method for measuring broadcast television signal power and system thereof |
| CN106899845A (en) * | 2017-04-19 | 2017-06-27 | 成都市宏山科技有限公司 | It is applied to the digitlization field intensity meter of DVB |
| CN112004079A (en) * | 2020-08-25 | 2020-11-27 | 深圳创维－Rgb电子有限公司 | Television detection system, method and storage medium |
-
2008
- 2008-06-17 CN CNU2008200948606U patent/CN201207706Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102438168A (en) * | 2011-10-10 | 2012-05-02 | 北京广电天地信息咨询有限公司 | Method for measuring broadcast television signal power and system thereof |
| CN106899845A (en) * | 2017-04-19 | 2017-06-27 | 成都市宏山科技有限公司 | It is applied to the digitlization field intensity meter of DVB |
| CN112004079A (en) * | 2020-08-25 | 2020-11-27 | 深圳创维－Rgb电子有限公司 | Television detection system, method and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN SKYWORTH DIGITAL TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SKY-WORTH DIGITAL TECHNOLOGY CO., LTD.;SHENZHEN CITY |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518057 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A14 Patentee after: Shenzhen Skyworth Digital Technology Co., Ltd. Address before: 518057 Guangdong city of Shenzhen province Nanshan District Gao Xin Road SKYWORTH building A14 Patentee before: Shenzhen Skyworth Digital Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090311 Termination date: 20160617 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |