CN201174746Y - Circuit apparatus for enhancing quality of video signal - Google Patents
Circuit apparatus for enhancing quality of video signal Download PDFInfo
- Publication number
- CN201174746Y CN201174746Y CNU2008203005172U CN200820300517U CN201174746Y CN 201174746 Y CN201174746 Y CN 201174746Y CN U2008203005172 U CNU2008203005172 U CN U2008203005172U CN 200820300517 U CN200820300517 U CN 200820300517U CN 201174746 Y CN201174746 Y CN 201174746Y
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- gain
- video signal
- circuit
- resistance
- video
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Abstract
The utility model relates to the color television set video signal gain control field, in particular to a circuit device for improving the video signal quality. The utility model discloses a circuit device for improving the video signal quality which reduces the video signal differential gain degree of distortion and the differential phase position degree of distortion at the same time of improving the video signal quality. The main technical proposal is as follows: an input end of a first gain control channel of a video gain integrated circuit is connected with a signal source by a first impedance match circuit, an output end of the first gain control channel is connected with an input end of a second gain control channel of the video gain integrated circuit by a capacitor C1; an output end of a second gain control channel of the video gain integrated circuit is connected with a periphery circuit by a second impedance match circuit, and the power supply end and an earthed end thereof are respectively connected with a power supply and the ground. The circuit device has the advantages of lowering the cost, improving the video signal quality and being suitable for all color television sets.
Description
Technical field
The utility model relates to color television set video gain control field, relates in particular to a kind of circuit arrangement that improves video signal quality.
Background technology
When the video amplitude of the integrated decode system output of color television set mated in the rear end, if amplitude can not reach the coupling requirement, the amplitude of generally need carrying out promoted.Traditional amplitude gain control, carrying out carrying out after the impedance matching signal voltage in the separating component mode amplifies impedance matching again and exports the system rear end to again, this type of design is comparatively common in traditional color television set system, though it is with low cost, but the shortcoming of its existence is that discrete device quantity is more, production link complexity, filtering characteristic especially distributed constant and bandwidth Design aspect difficult parameters are easy to cause video differential gain ditortion and differential phase distortion to guarantee.
The utility model content
Deficiency at the above-mentioned background technology, technical problem to be solved in the utility model is: a kind of circuit arrangement that improves video signal quality is provided, has reduced vision signal differential gain ditortion degree and differential phase distortion degree when having promoted video signal quality.
The technical scheme in the invention for solving the above technical problem is: improve the circuit arrangement of video signal quality, comprise the video gain integrated circuit, described video gain integrated circuit comprises the first gain controlling passage and the second gain controlling passage; The input of the described first gain controlling passage is connected to signal source by first impedance matching circuit, and output connects the input of the described second gain controlling passage by capacitor C 1; The output of the described second gain controlling passage is connected to peripheral circuit by second impedance matching circuit; The power end of described video gain integrated circuit is connected power supply and ground respectively with earth terminal.
Further have: described first impedance matching circuit is made of resistance R 1 and capacitor C 4 series connection; Described second impedance matching circuit is made of resistance R 2 and capacitor C 2 series connection.
Further have: also comprise resistance R 3, resistance R 4, capacitor C 3 and piezo-resistance D1, described resistance R 3 is connected between the input of power supply and the described first gain controlling passage; Described resistance R 4 is connected between the input of power supply and the described second gain controlling passage; Described capacitor C 3 is connected between power supply and the ground; Described piezo-resistance D1 one end connects capacitor C 2, other end ground connection.
The beneficial effects of the utility model are: utilize less components and parts to finish the control that video amplitude is gained, reduced cost, because characteristics such as the multistage filtering of integrated circuit and wide bandwidth have reduced vision signal differential gain ditortion degree and differential phase distortion degree, promoted simultaneously
Video signal quality.
Description of drawings
Fig. 1 is an embodiment circuit structure diagram of the present utility model.
Specific embodiment
The utility model has adopted more separating component and has proposed a kind of new circuit arrangement at conventional video signals amplitude gain control, this device to each passage of integrated circuit superpose use not only saved resource and reduced the quality that cost has also promoted vision signal.
The utility model will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, the circuit arrangement of the raising video signal quality in this example comprises video gain integrated circuit U1, and this video gain integrated circuit U1 has three independent gain controlling passages, i.e. IN1 and OUT1, IN2 and OUT2, IN3 and OUT3.The IN1 end of U1 is connected to signal source by the impedance matching circuit that capacitor C 4 and resistance R 1 constitute, after being coupled by capacitor C 1, the OUT1 end of U1 is connected to the IN3 end of U1, the OUT3 end of U1 is connected to peripheral circuit by the impedance matching circuit that resistance R 2 and capacitor C 2 constitute, and the VCC end of U1 is connected power supply and ground respectively with the GND end.Further, resistance R 3 is connected between IN1 end and the power supply, and resistance R 4 is connected between IN3 end and the power supply, also is connected with capacitor C 3 between power supply and the ground, and piezo-resistance D1 is connected between capacitor C 2 and the ground.
Concerning this example, the signal source input range is the input signal of xV (peak-to-peak value voltage) inputs to video gain integrated circuit U1 by the match circuit of being made up of resistance R 1 and capacitor C 4 an IN1 end, after clamp by integrated circuit U1 inside, filtering, 6dB gain controlling etc. are handled, by the signal of the OUT1 output output 2xV (peak-to-peak value voltage) of passage one; Export IN3 (or IN2) end of U1 to by signal process capacitor C 1 coupling of OUT1 end output, pass through clamp, filtering, 6dB gain controlling once more after the output of the OUT3 of U1 (or OUT2) end, thereby realized the output of 4xV (peak-to-peak value voltage) range signal, output signal enters the peripheral circuit part afterwards.Piezo-resistance D1 in this example designs in order to prevent ESD (static discharge) characteristic, resistance R 3, resistance R 4 are for improving interport isolation, prevent that direct voltage drift from helping reducing the pull-up resistor of differential gain ditortion and differential phase distortion, and capacitor C 3 is the filter capacitor of power supply VCC.
Claims (3)
1. improve the circuit arrangement of video signal quality, it is characterized in that: comprise the video gain integrated circuit, described video gain integrated circuit comprises the first gain controlling passage and the second gain controlling passage; The input of the described first gain controlling passage is connected to signal source by first impedance matching circuit, and output connects the input of the described second gain controlling passage by capacitor C 1; The output of the described second gain controlling passage is connected to peripheral circuit by second impedance matching circuit; The power end of described video gain integrated circuit is connected power supply and ground respectively with earth terminal.
2. the circuit arrangement of raising video signal quality according to claim 1 is characterized in that: described first impedance matching circuit is made of resistance R 1 and capacitor C 4 series connection; Described second impedance matching circuit is made of resistance R 2 and capacitor C 2 series connection.
3. the circuit arrangement of raising video signal quality according to claim 2 is characterized in that: also comprise resistance R 3, resistance R 4, capacitor C 3 and piezo-resistance D1, described resistance R 3 is connected between the input of power supply and the described first gain controlling passage; Described resistance R 4 is connected between the input of power supply and the described second gain controlling passage; Described capacitor C 3 is connected between power supply and the ground; Described piezo-resistance D1 one end connects capacitor C 2, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008203005172U CN201174746Y (en) | 2008-04-07 | 2008-04-07 | Circuit apparatus for enhancing quality of video signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008203005172U CN201174746Y (en) | 2008-04-07 | 2008-04-07 | Circuit apparatus for enhancing quality of video signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201174746Y true CN201174746Y (en) | 2008-12-31 |
Family
ID=40201876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008203005172U Expired - Fee Related CN201174746Y (en) | 2008-04-07 | 2008-04-07 | Circuit apparatus for enhancing quality of video signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201174746Y (en) |
-
2008
- 2008-04-07 CN CNU2008203005172U patent/CN201174746Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081231 Termination date: 20150407 |
|
| EXPY | Termination of patent right or utility model |