CN105163003A - Integrated filter module equipped with video signal pre-amplifying circuit - Google Patents
Integrated filter module equipped with video signal pre-amplifying circuit Download PDFInfo
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- CN105163003A CN105163003A CN201510428391.1A CN201510428391A CN105163003A CN 105163003 A CN105163003 A CN 105163003A CN 201510428391 A CN201510428391 A CN 201510428391A CN 105163003 A CN105163003 A CN 105163003A
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Abstract
The invention belongs to the field of analog high-definition video signal processing and transmission, and especially the field of long-distance transmission of analog high-definition video signals, and specifically relates to an integrated filter module equipped with a video signal pre-amplifying circuit. The integrated filter module may reduce the complexity of a system, simply and effectively solve a problem of the long-distance transmission of high-definition video signals, and comprises a synchronous head clamp circuit, an output DC bias circuit, a video filter circuit, a video pre-amplifying circuit, and a video driving circuit.
Description
Technical field
The invention belongs to simulation high-definition video signal process and transmission field, particularly simulate the long range propagation field of high-definition video signal, be specially a kind of integrated filter module containing vision signal pre-amplification circuit.
Background technology
The application of the full HD video monitoring system of society is more and more extensive, and the problem simulating the long range propagation of high-definition signal also becomes and becomes more and more important.The chrominance signal frequency of simulation high-definition video signal is higher, and it is serious that the load that long range propagation cable causes can make high frequency chrominance signal decay, and receiving device video is deteriorated, and cross-color even cannot be watched.In the prior art, conventional digital method carries out pre-amplification or compensation to vision signal, processes at the receiving end signal of high definition analog video systems, but the complexity of digital method is higher, realizes cost large.
Summary of the invention
In order to solve the problem, the invention provides a kind of integrated filter module containing vision signal pre-amplification circuit, it can reduce the complexity of system, simply, effectively can solve the long range propagation problem of high-definition video signal.
Its technical scheme is such: a kind of integrated filter module containing vision signal pre-amplification circuit, is characterized in that: it comprises synchronous head clamp circuit, exports DC bias circuit, video filtering circuit, video preprocessor amplifying circuit, video driver circuit.
It is further characterized in that, described video preprocessor amplifying circuit is that single circuit module or described video prevent large circuit and described video filtering circuit to be integrated into a circuit module or described video prevents large circuit and described video driver circuit to be integrated into a circuit module;
Video preprocessor amplifying circuit operational amplifier, resistance R1, resistance R3, electric capacity C1, the reverse input end contact resistance R1 of described operational amplifier, resistance R3 one end, the described resistance R1 other end connects the output of described operational amplifier, the other end of described resistance R3 connects described electric capacity C1 one end, described electric capacity C1 other end ground connection, the positive input of described operational amplifier connects the output of described video filtering circuit, and the output of described operational amplifier connects the input of described video driver circuit; Or the positive input of described operational amplifier connects the output of described synchronous head clamp circuit, the output of described operational amplifier connects the input of described video filter circuit; Or the positive input of described operational amplifier connects the output of described video driver circuit, the output of described operational amplifier connects the input of described integrated filter module;
Reverse input end also contact resistance R2 one end of described operational amplifier, described resistance R2 other end ground connection, the gain of vision signal medium and low frequency luminance signal is determined by the resistance ratio of resistance R1 and resistance R2, and the gain of vision signal medium-high frequency chrominance signal is determined jointly by the resistance of resistance R1, R2, R3 and the capacitance of electric capacity C1;
Described synchronous head clamp circuit, export DC bias circuit, video filtering circuit, video preprocessor amplifying circuit, video driver circuit are integrated into a chip or described synchronous head clamp circuit, the operational amplifier exported in DC bias circuit, video filtering circuit, video driver circuit, video preprocessor amplifying circuit, resistance R1, resistance R2 are integrated into a chip, in resistance R3, electric capacity C1, any one components and parts is arranged in chip exterior another is also integrated in chip internal or resistance R3, electric capacity C1 and is all arranged in chip exterior.
After adopting circuit of the present invention and side, change traditional drawback at the receiving terminal of HD video system, signal compensated with digital method, the vision signal that video filtering circuit exports carries out pre-amplification to compensate the decay caused in long range propagation process by pre-amplification circuit, reduce the complexity of system, reduce power consumption and cost simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is video preprocessor amplifying circuit schematic diagram.
Embodiment
See Fig. 1, shown in Fig. 2, a kind of integrated filter module containing vision signal pre-amplification circuit, comprises synchronous head clamp circuit 1, export DC bias circuit 2, video filtering circuit 3, video preprocessor amplifying circuit 4, video driver circuit 5, video preprocessor amplifying circuit operational amplifier, resistance R1, resistance R3, electric capacity C1, the reverse input end contact resistance R1 of operational amplifier, resistance R3 one end, the output of resistance R1 other end concatenation operation amplifier, the other end of resistance R3 connects electric capacity C1 one end, electric capacity C1 other end ground connection, reverse input end also contact resistance R2 one end of operational amplifier, resistance R2 other end ground connection, the positive input of operational amplifier connects the output of video filtering circuit, the output of operational amplifier connects the input of video driver circuit, simulation high-definition video signal inputs from the input of synchronous head clamp circuit 1, through exporting DC bias circuit 2, video filtering circuit 3, video preprocessor amplifying circuit 4, export after video driver circuit 5, then deliver to simulation high-definition video signal receiving terminal via transmission cable 6.Video preprocessor amplifying circuit can be single circuit module, also can be that video prevents large circuit and video filtering circuit to be integrated into a circuit module, can also be that video prevents large circuit and video driver circuit to be integrated into a circuit module; Can by synchronous head clamp circuit, export DC bias circuit, video filtering circuit, video preprocessor amplifying circuit, video driver circuit is whole is integrated into a chip, also can be by synchronous head clamp circuit, export DC bias circuit, video filtering circuit, video driver circuit, the operational amplifier in video preprocessor amplifying circuit, resistance R1, resistance R2 be integrated into a chip, in resistance R3, electric capacity C1, any one components and parts be arranged in chip exterior and another is also integrated in chip internal or resistance R3, electric capacity C1 and is all arranged in chip exterior.In the present embodiment, the positive input of operational amplifier is connected the output of video filtering circuit, the output of operational amplifier connects the input of video driver circuit.Following two kinds of modes can also be had, when video prevents large circuit and video filtering circuit is integrated into a circuit module, the positive input of operational amplifier connects the output of synchronous head clamp circuit, and the output of operational amplifier connects the input of video filter circuit; When video prevents large circuit and video driver circuit to be integrated into a circuit module, the positive input of operational amplifier connects the output of video driver circuit, and the output of operational amplifier connects the input of integrated filter module.
Vision signal pre-amplification method in video preprocessor amplifying circuit of the present invention, operational amplifier reverse input end contact resistance R1 in video preprocessor amplifying circuit, resistance R3 one end, the output of resistance R3 other end concatenation operation amplifier, the resistance R1 other end connects after connecting electric capacity C1, video preprocessor amplifying circuit is in reverse input end also contact resistance R2 one end of operational amplifier, resistance R2 other end ground connection, the vision signal of pre-amplification inputs from the positive input of operational amplifier, export from the output of operational amplifier, according to the independent adjusting resistance R1 of the transmission range of vision signal, R2, the resistance of R3 or the capacitance of electric capacity C1, also can simultaneously adjusting resistance R1, R2, the resistance of R3 or the capacitance of electric capacity C1, the chrominance signal gain of simulation high-definition video signal medium-high frequency can be amplified by video preprocessor amplifying circuit, keep the luminance signal gain of vision signal medium and low frequency constant simultaneously, the high frequency chrominance signal decay caused for preventing practical application middle and long distance transmission cable.
The gain of vision signal medium and low frequency luminance signal is determined by the resistance ratio of resistance R1 and resistance R2, and the gain of vision signal medium-high frequency chrominance signal is determined jointly by the resistance of resistance R3 and the capacitance of electric capacity C1.
Video preprocessor amplifying circuit transfer function is as follows:
As frequency input signal f->0, its DC current gain
;
As frequency input signal f-> ∞, system gain
The gain of vision signal medium and low frequency luminance signal is determined by the resistance ratio of resistance R1 and resistance R2, resistance and the ratio of resistance R1 and resistance R2 can be determined according to the gain of input signal medium and low frequency luminance signal, if require that the gain of direct current signal in input signal is 1, then R2 directly can be removed, i.e. R2-> ∞; In vision signal, the gain of input signal medium-high frequency chrominance signal is determined jointly by the resistance of resistance R1, R2, R3 and the capacitance of electric capacity C1, can the resistance of adjusting resistance R1, R2, R3 or the capacitance of electric capacity C1 separately according to the adjustment of the transmission range of vision signal, also can while the resistance of adjusting resistance R1, R2, R3 and the capacitance of electric capacity C1.
Claims (7)
1. the integrated filter module containing vision signal pre-amplification circuit, is characterized in that: it comprises synchronous head clamp circuit, exports DC bias circuit, video filtering circuit, video preprocessor amplifying circuit, video driver circuit.
2. a kind of integrated filter module containing vision signal pre-amplification circuit according to claim 1, is characterized in that: described video preprocessor amplifying circuit is that single circuit module or described video preprocessor amplifying circuit and described video filtering circuit are integrated into a circuit module or described video preprocessor amplifying circuit and described video driver circuit and are integrated into a circuit module.
3. a kind of integrated filter module containing vision signal pre-amplification circuit according to claim 2, it is characterized in that: video preprocessor amplifying circuit comprises operational amplifier, resistance R1, resistance R3, electric capacity C1, the reverse input end contact resistance R1 of described operational amplifier, resistance R3 one end, the described resistance R1 other end connects the output of described operational amplifier, the other end of described resistance R3 connects described electric capacity C1 one end, described electric capacity C1 other end ground connection, the positive input of described operational amplifier connects the output of described video filtering circuit, the output of described operational amplifier connects the input of described video driver circuit, or the positive input of described operational amplifier connects the output of described synchronous head clamp circuit, the output of described operational amplifier connects the input of described video filter circuit, or the positive input of described operational amplifier connects the output of described video driver circuit, the output of described operational amplifier connects the input of described integrated filter module.
4. a kind of integrated filter module containing vision signal pre-amplification circuit according to claim 3, it is characterized in that: reverse input end also contact resistance R2 one end of described operational amplifier, described resistance R2 other end ground connection, the gain of vision signal medium and low frequency luminance signal is determined by the resistance ratio of resistance R1 and resistance R2, and the gain of vision signal medium-high frequency chrominance signal is determined jointly by the resistance of resistance R1, R2, R3 and the capacitance of electric capacity C1.
5. a kind of integrated filter module containing vision signal pre-amplification circuit according to claim 3 or 4, is characterized in that: described synchronous head clamp circuit, output DC bias circuit, video filtering circuit, video preprocessor amplifying circuit, video driver circuit are integrated into a chip.
6. a kind of integrated filter module containing vision signal pre-amplification circuit according to claim 4, it is characterized in that: described synchronous head clamp circuit, the operational amplifier exported in DC bias circuit, video filtering circuit, video driver circuit, video preprocessor amplifying circuit, resistance R1, resistance R2 are integrated into a chip, and described resistance R3, electric capacity C1 are arranged in chip exterior.
7. a kind of integrated filter module containing vision signal pre-amplification circuit according to claim 4, it is characterized in that: described synchronous head clamp circuit, export DC bias circuit, video filtering circuit, video driver circuit, operational amplifier in video preprocessor amplifying circuit, resistance R1, resistance R2, resistance R3 is integrated into a chip, described electric capacity C1 is arranged in chip exterior or described synchronous head clamp circuit, export DC bias circuit, video filtering circuit, video driver circuit, operational amplifier in video preprocessor amplifying circuit, resistance R1, resistance R2, electric capacity C1 is integrated into a chip, described resistance R3 is arranged in chip exterior.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510428391.1A CN105163003B (en) | 2015-07-21 | 2015-07-21 | A kind of integrated filter module containing vision signal pre-amplification circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510428391.1A CN105163003B (en) | 2015-07-21 | 2015-07-21 | A kind of integrated filter module containing vision signal pre-amplification circuit |
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| CN105163003A true CN105163003A (en) | 2015-12-16 |
| CN105163003B CN105163003B (en) | 2018-08-31 |
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| CN201510428391.1A Active CN105163003B (en) | 2015-07-21 | 2015-07-21 | A kind of integrated filter module containing vision signal pre-amplification circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106878585A (en) * | 2017-01-19 | 2017-06-20 | 杭州瑞盟科技有限公司 | The full HD FHD of high definition HD/ may be selected video filtering driver |
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| CN1791717A (en) * | 2003-05-21 | 2006-06-21 | 大赛璐化学工业株式会社 | Automatic determination apparatus |
| CN1874419A (en) * | 2005-01-13 | 2006-12-06 | 国家半导体公司 | Video signal clamp circuit |
| CN1969538A (en) * | 2004-07-23 | 2007-05-23 | 罗姆股份有限公司 | Video signal output circuit, and electronic device using the circuit |
| CN101795385A (en) * | 2009-02-03 | 2010-08-04 | 厦门Abb振威电器设备有限公司 | Automatic preamplification and precompensation twisted-pair video transmission method and system |
| CN201601737U (en) * | 2010-03-22 | 2010-10-06 | 青岛海信电器股份有限公司 | Video amplifying circuit |
| CN102170551A (en) * | 2011-03-18 | 2011-08-31 | 成都鸿福润德科技有限公司 | Power-off straight-through bandwidth CATV (Community Antenna Television) signal filtering amplifier |
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2015
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1791717A (en) * | 2003-05-21 | 2006-06-21 | 大赛璐化学工业株式会社 | Automatic determination apparatus |
| CN1969538A (en) * | 2004-07-23 | 2007-05-23 | 罗姆股份有限公司 | Video signal output circuit, and electronic device using the circuit |
| CN1874419A (en) * | 2005-01-13 | 2006-12-06 | 国家半导体公司 | Video signal clamp circuit |
| CN101795385A (en) * | 2009-02-03 | 2010-08-04 | 厦门Abb振威电器设备有限公司 | Automatic preamplification and precompensation twisted-pair video transmission method and system |
| CN201601737U (en) * | 2010-03-22 | 2010-10-06 | 青岛海信电器股份有限公司 | Video amplifying circuit |
| CN102170551A (en) * | 2011-03-18 | 2011-08-31 | 成都鸿福润德科技有限公司 | Power-off straight-through bandwidth CATV (Community Antenna Television) signal filtering amplifier |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106878585A (en) * | 2017-01-19 | 2017-06-20 | 杭州瑞盟科技有限公司 | The full HD FHD of high definition HD/ may be selected video filtering driver |
| CN106878585B (en) * | 2017-01-19 | 2024-02-06 | 杭州瑞盟科技股份有限公司 | High-definition HD/full-definition FHD selectable video filter driver |
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| Publication number | Publication date |
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| CN105163003B (en) | 2018-08-31 |
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Effective date of registration: 20221209 Address after: No. 295, Building 17, No. 2723, Fuchunwan Avenue, Chunjiang Street, Fuyang District, Hangzhou, Zhejiang, 310000 Patentee after: Hangzhou Sitai Microelectronics Co.,Ltd. Address before: No. 16, Changjiang Road, New District, Wuxi City, Jiangsu Province, 214028 Patentee before: STEADICHIPS Inc. |