CN109510953B - Conversion circuit for converting S-separation video signal into composite video signal - Google Patents
Conversion circuit for converting S-separation video signal into composite video signal Download PDFInfo
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- CN109510953B CN109510953B CN201811445124.5A CN201811445124A CN109510953B CN 109510953 B CN109510953 B CN 109510953B CN 201811445124 A CN201811445124 A CN 201811445124A CN 109510953 B CN109510953 B CN 109510953B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/148—Video amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
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Abstract
The application discloses S separation video signal converts converting circuit of compound video signal into belongs to the video signal processing field, and it includes: a video conversion module that receives a luminance video signal and a chrominance video signal and synthesizes a composite video signal; the video amplification module receives the composite video signal and amplifies the composite video signal to generate a plurality of paths of video signals; and the power supply module is used for converting alternating current into direct current and supplying power to the video conversion module and the video amplification module. The conversion circuit for converting the S separation video signal into the composite video signal can solve the problem that the S separation video signal on the airplane is led to an operation room from a microwave room harmful to a human body, is used for collecting and monitoring test data, and fills the gap in the fields of multi-channel S separation video signal collection/transmission and multi-channel composite video signal collection/display in the market.
Description
Technical Field
The application belongs to the technical field of video signal transmission, and particularly relates to a conversion circuit for converting S-separation video signals into composite video signals.
Background
The S-separation Video signal (also called S-Video signal) is a signal for separating and transmitting brightness and chroma, can avoid mutual interference of the brightness and the chroma when a mixed Video signal is transmitted, and is widely applied to Video signal transmission of various laboratories, test platforms and airborne equipment. The composite video signal is a composite signal including a luminance signal and a chrominance signal, and is widely used in acquisition and display.
However, in the process of acquiring and displaying signals of an airplane, multiple paths of data need to be acquired and monitored, and the transmission distances of the signals are different. In order to ensure the transmission quality, S-separation video signal transmission is adopted, and composite video signals are adopted in the acquisition and display processes.
Disclosure of Invention
The application aims to provide a conversion circuit for converting an S-separation video signal into a composite video signal so as to solve the conversion problem of S-separation video signal transmission and composite video signal display.
The technical scheme of the application is as follows: a conversion circuit for converting an S-split video signal into a composite video signal, comprising: a video conversion module that receives a luminance video signal and a chrominance video signal and synthesizes a composite video signal; the video amplification module receives the composite video signal and amplifies the composite video signal to generate a plurality of paths of video signals; and the power supply module is used for converting alternating current into direct current and supplying power to the video conversion module and the video amplification module.
In this application, power module includes isolation transformer, filter capacitor and steady voltage integrated unit, isolation transformer is used for turning into AC 12V with AC 220V, steady voltage integrated unit be used for with AC 12V after isolation transformer conversion turns into DC 5V, filter capacitor set up in isolation transformer with be used for the filtering before the steady voltage in the electric wire netting different frequency channel interference signal between the integrated unit.
In the present application, the filter capacitor is plural and includes an electrolytic capacitor and a tantalum capacitor, and capacities of the capacitors are different.
In this application, the video conversion module includes electric capacity, resistance and video operational amplifier chip, luminance video signal Y and colourity video signal C are received and are merged into compound video signal output to the input of video operational amplifier chip, the electric capacity is including isolation capacitance and filter capacitor, resistance and isolation capacitance set up be used for impedance matching between video operational amplifier chip input and the output, filter capacitor sets up the power end of video operational amplifier chip for the filtering gets into electric wire netting conduction interfering signal and circuit board coupling interfering signal before the video operational amplifier chip.
In this application, the video amplification module includes electric capacity, resistance and video operational amplification chip, the input of video operational amplification chip is received the compound video signal of video conversion module output and the compound video signal after the output amplification, the electric capacity is including isolation capacitance and filter capacitor, resistance and/or isolation capacitance set up be used for impedance matching between video operational amplification chip input and the output, filter capacitor sets up the power end of video operational amplification chip for the filtering gets into electric wire netting conduction interfering signal and circuit board coupling interfering signal before the video operational amplification chip.
The utility model provides a conversion circuit of S separation video signal conversion composite video signal can solve and draw the operation room to S separation video signal from the microwave room harmful to the human body on the aircraft for experimental data 'S collection and control have filled the blank in multichannel S separation video signal collection/transmission and multichannel composite video signal collection/demonstration field in market, and this application design is nimble, low cost, and image display is clear stable, can satisfy different users' demand.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.
FIG. 1 is a schematic diagram of a conversion circuit according to the present application;
FIG. 2 is a circuit diagram of a power supply unit of the present application;
FIG. 3 is a circuit diagram of a video conversion unit according to the present application;
fig. 4 is a circuit diagram of a video amplifying unit according to the present application.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.
As shown in fig. 1, the conversion circuit for converting an S-separation video signal into a composite video signal mainly includes a power module, a video conversion module and a video amplification module, where the number of the video conversion module and the video amplification module is determined by the number of video channels to be acquired and monitored, the video conversion module receives a luminance video signal and a chrominance video signal and synthesizes the composite video signal, the video amplification module receives the synthesized composite video signal and generates a plurality of paths of video signals from the composite video signal, and the power module is configured to convert an ac power into a dc power and supply power to the video conversion module and the video amplification module.
Referring to fig. 2, the power module in the present application is mainly composed of an isolation transformer, a capacitor and a voltage stabilizing integrated block. Because the video signal is weak and is easy to be interfered, the image generates snowflake points or jittering distortion, and the requirement on the quality of the power supply is very high, so that the application does not adopt a switch power supply, but adopts a linear power supply. The isolation transformer mainly converts AC/220V into AC/12V, the voltage stabilization integrated unit mainly converts the AC/12V converted by the isolation transformer into DC/5V, the filter capacitor is used for filtering interference signals of different frequency bands in a power grid before voltage stabilization, particularly interference signals of low frequency bands, so that a relatively clean +/-5V direct-current power supply is generated to be used by the video conversion module and the video amplification module, the filter capacitor adopts high-quality electrolytic capacitors and tantalum capacitors with different capacities, and the tantalum capacitors and the electrolytic capacitors are arranged in the power grid in parallel.
As shown in fig. 3, the video conversion module in the present application mainly includes a capacitor, a resistor, and a video operational amplifier chip. The luminance video signal Y and the chrominance video signal C are combined into a composite video signal by the amplifying and mixing functions of the video operational amplifier chip. The resistors of the input end and the output end of the video conversion module adopt high-precision thick film chip resistors due to the problem of impedance matching. The filtering and isolating capacitor adopts a high-precision tantalum capacitor. The +/-5V direct current power supply provided by the power supply module further adopts a filter capacitor for filtering before entering the video operational amplification chip, and further filters out conducted interference signals in a power grid and circuit board coupling interference signals.
Referring to fig. 4, the video amplification module in the present application is composed of a capacitor, a resistor and a video operational amplification chip. The input end of the video operational amplification chip receives the composite video signal output by the video conversion module and outputs the amplified composite video signal, and the resistors of the input end and the output end of the video amplification module relate to the problem of impedance matching, so that a high-precision thick-film chip resistor is adopted. The filter capacitor adopts a high-precision tantalum capacitor. The video operational amplifier chip selects a chip with high speed and strong loading capacity. The plus or minus 5V direct current power supply provided by the power supply module further adopts a capacitance filtering measure before entering the video operational amplification chip, so as to further filter the conducted interference signals in the power grid and the circuit board coupling interference signals.
The utility model provides a conversion circuit of S separation video signal conversion composite video signal can solve and draw the operation room to S separation video signal from the microwave room harmful to the human body on the aircraft for experimental data 'S collection and control have filled the blank in multichannel S separation video signal collection/transmission and multichannel composite video signal collection/demonstration field in market, and this application design is nimble, low cost, and image display is clear stable, can satisfy different users' demand.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (1)
1. A conversion circuit for converting an S-split video signal into a composite video signal, comprising:
a video conversion module that receives the luminance video signal and the chrominance video signal and synthesizes a composite video signal, wherein, the video conversion module comprises a capacitor, a resistor and a video operational amplifier chip, the input end of the video operational amplifier chip combines the brightness video signal Y and the chroma video signal C into a composite video signal and outputs the composite video signal from the output end of the video operational amplifier chip, the resistors of the input end and the output end of the video conversion module adopt thick film patch resistors, the capacitor comprises a filter capacitor and an isolation capacitor which adopt tantalum capacitors, the resistor and the isolation capacitor are arranged between the input end and the output end of the video operational amplifier chip, the filter capacitor is arranged at the power supply end of the video operational amplification chip and is used for filtering power grid conducted interference signals and circuit board coupled interference signals before entering the video operational amplification chip;
a video amplification module that receives the composite video signal and amplifies the composite video signal to generate a plurality of channels of video signals, wherein, the video amplifying module comprises a capacitor, a resistor and a video operational amplifying chip, the input end of the video operational amplifying chip receives the composite video signal output by the video converting module and outputs the amplified composite video signal at the output end of the video operational amplifying chip, the resistors at the input end and the output end of the video amplifying module adopt thick film chip resistors, the capacitor comprises an isolating capacitor and a filter capacitor which adopt tantalum capacitors, and the resistor and/or the isolating capacitor are/is arranged between the input end and the output end of the video operational amplifying chip, the filter capacitor is arranged at the power supply end of the video operational amplification chip and is used for filtering power grid conducted interference signals and circuit board coupled interference signals before entering the video operational amplification chip;
the power supply module is used for converting alternating current into direct current and supplying power to the video conversion module and the video amplification module, the power supply module comprises an isolation transformer, a filter capacitor and a voltage stabilization integrated unit, the isolation transformer is used for converting AC/220V into AC/12V, the voltage stabilization integrated unit is used for converting the AC/12V converted by the isolation transformer into DC/5V, the filter capacitor is arranged between the isolation transformer and the voltage stabilization integrated unit and used for filtering interference signals of different frequency bands in a power grid before voltage stabilization, the filter capacitor comprises a plurality of electrolytic capacitors and tantalum capacitors with different capacities, and the electrolytic capacitors and the tantalum capacitors are arranged in the power grid in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811445124.5A CN109510953B (en) | 2018-11-29 | 2018-11-29 | Conversion circuit for converting S-separation video signal into composite video signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811445124.5A CN109510953B (en) | 2018-11-29 | 2018-11-29 | Conversion circuit for converting S-separation video signal into composite video signal |
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| CN109510953A CN109510953A (en) | 2019-03-22 |
| CN109510953B true CN109510953B (en) | 2021-08-17 |
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| CN201811445124.5A Active CN109510953B (en) | 2018-11-29 | 2018-11-29 | Conversion circuit for converting S-separation video signal into composite video signal |
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Citations (5)
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| CN1047005A (en) * | 1989-04-20 | 1990-11-14 | 汤姆森消费电子有限公司 | Television receiver with auxiliary input connector of bright-Se format video signal of separation |
| CN1134642A (en) * | 1995-01-31 | 1996-10-30 | 汤姆森消费电子有限公司 | Component to composite video signal converter circuit |
| WO1997019563A1 (en) * | 1995-11-23 | 1997-05-29 | Philips Electronics N.V. | Comb filter module with both composite and y/c-separated inputs |
| CN101179708A (en) * | 2007-10-31 | 2008-05-14 | 天津市亚安科技电子有限公司 | Circuit of S video and compound video simultaneous output suitable for platform camera |
| CN101330278A (en) * | 2007-06-20 | 2008-12-24 | 天津市亚安科技电子有限公司 | Gain programmable vision buffer amplifier circuit with SAG compensation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202121562U (en) * | 2011-03-24 | 2012-01-18 | 深圳市同洲电子股份有限公司 | Power switch circuit and digital television receiving terminal |
| CN103872755A (en) * | 2012-12-17 | 2014-06-18 | 中国船舶重工集团公司第七0七研究所 | Double power supply seamless switching circuit |
| CN204065751U (en) * | 2014-09-04 | 2014-12-31 | 杭州电子科技大学 | Air purifier control circuit |
| CN104216323B (en) * | 2014-09-04 | 2016-11-30 | 杭州电子科技大学 | Control system of air purifier |
| CN106769979B (en) * | 2016-12-22 | 2019-05-17 | 核工业北京化工冶金研究院 | A kind of high-accuracy infrared moisture meter detection device |
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| CN1047005A (en) * | 1989-04-20 | 1990-11-14 | 汤姆森消费电子有限公司 | Television receiver with auxiliary input connector of bright-Se format video signal of separation |
| CN1134642A (en) * | 1995-01-31 | 1996-10-30 | 汤姆森消费电子有限公司 | Component to composite video signal converter circuit |
| WO1997019563A1 (en) * | 1995-11-23 | 1997-05-29 | Philips Electronics N.V. | Comb filter module with both composite and y/c-separated inputs |
| CN101330278A (en) * | 2007-06-20 | 2008-12-24 | 天津市亚安科技电子有限公司 | Gain programmable vision buffer amplifier circuit with SAG compensation |
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| CN109510953A (en) | 2019-03-22 |
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