CN107749959A - A kind of contour correction circuit - Google Patents
A kind of contour correction circuit Download PDFInfo
- Publication number
- CN107749959A CN107749959A CN201710971943.2A CN201710971943A CN107749959A CN 107749959 A CN107749959 A CN 107749959A CN 201710971943 A CN201710971943 A CN 201710971943A CN 107749959 A CN107749959 A CN 107749959A
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- CN
- China
- Prior art keywords
- resistance
- electric capacity
- triode
- circuit
- inductance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
-
- 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
- H04N9/643—Hue control means, e.g. flesh tone control
-
- 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
- H04N9/68—Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
Abstract
The invention discloses a kind of contour correction circuit, including resistance R1, resistance R2, resistance R3, resistance R4, potentiometer R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, inductance L1, inductance L2, triode V1, luminance signal enters from resistance R1, the resistance R1 connects with resistance R2, the other end connecting triode V1 at resistance R2 connections resistance R1 ends base stage, described electric capacity C1 one end is connected on the circuit that resistance R2 is connected with triode V1, its other end connection resistance R3, the other end connection resistance R4 at the resistance R3 connections resistance capacitance C1 ends, the other end ground connection at the resistance R4 connections resistance R3 ends；The present invention changes in luminance signal partly to work faster, and colelctor electrode just produces a crisperding signal, to improve the waveform of lower edge on output voltage, so as to improve image definition.
Description
Technical field
The present invention relates to contour correction, and in particular to a kind of contour correction circuit.
Background technology
TV (Television, TV, Video) refers to the image frame and audio using electronic technology and equipment transmission activity
Signal, i.e. television receiver, and important broadcast and video communication instrument, television set is earliest by Britain engineer John Lip river
Lucky Baird is invented in nineteen twenty-five.The visual pattern of TV electronically transmission activity immediately.It is similar with film, TV profit
Show the rest image of a frame frame gradual change with the persistence of vision effect of human eye, form visual live image.Television system is sent out
It is order transmission after electric signal that each fine fraction of scenery is pressed brightness and chroma conversion by sending end.In receiving terminal by corresponding several
What position shows brightness and the colourity of each fine fraction to reappear view picture original image.The progress of science and technology, is that TV is rapid
One major reason of popularization.Various countries' TV signal scanning standard and channel broadband are incomplete same, are seeked advice from by international wireless electricity
The suggestion of the committee (CCIR) is distinguished with the Latin alphabet.Contour correction --- either vidicon camera or CCD shootings
, aperture distortion all be present, he makes to fog at image detail and black and white saltus step, that is, is high-frequency signal in machine either television set
Amplitude declines.The contour correction circuit of video camera is corrected to horizontal aperture and vertical aperture.
The content of the invention
The technical problems to be solved by the invention are that television set has aperture distortion, and he makes at image detail and black and white saltus step
Fog, and it is an object of the present invention to provide a kind of contour correction circuit, avoids high frequency signal amplitude from declining, to horizontal aperture and vertical aperture
It is corrected.
The present invention is achieved through the following technical solutions：
A kind of contour correction circuit, including resistance R1, resistance R2, resistance R3, resistance R4, potentiometer R5, resistance R6, resistance
R7, resistance R8, resistance R9, resistance R10, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, inductance L1, inductance L2, triode V1,
Luminance signal enters from resistance R1, and the resistance R1 connects with resistance R2, and the other end at the resistance R2 connections resistance R1 ends connects
Triode V1 base stage is connect, described electric capacity C1 one end is connected on the circuit that resistance R2 is connected with triode V1, and its other end connects
Connecting resistance R3, the other end connection resistance R4 at the resistance R3 connections resistance capacitance C1 ends, the resistance R4 connections resistance R3 ends
The other end ground connection；A fixing end of the potentiometer R5 is connected on the circuit that resistance R3 is connected with resistance R4, another
Fixing end is grounded, and potentiometer R5 movable end connection resistance R6, the resistance R6 are to measure saturation degree output end, the electric capacity C2 mono-
End ground connection, its other end are connected on the circuit that resistance R6 is connected with potentiometer R5；The termination powers of inductance L2 mono-, its other end with
Triode V1 colelctor electrode connection, the resistance R8 are connected in parallel on inductance L2 both ends, described electric capacity C4 one end be connected to resistance R8 with
On the circuit of triode V1 connections, the connection of its other end resistance R9, resistance the R9 other end connection resistance R10, the resistance R10
Connect the other end ground connection at resistance R9 ends；Electric capacity C3 one end connecting triode V1 emitter stage, its other end connection resistance R7, institute
State resistance R7 other end ground connection；Described inductance L1 one end is connected on the circuit that electric capacity C3 is connected with triode V1, and its is another
End is connected on the circuit that resistance R9 is connected with resistance R10, meanwhile, it is defeated for signal on the circuit that resistance R9 is connected with resistance R10
Go out end.
The circuit of profile calibration is realized, uses second differential type crispening circuit in color TV set, if V1 base more
The luminance signal of pole input is the high-frequency rectangular pulse of distortion, V1 input circuit (including V1 input resistance and emitter-base bandgap grading R7,
C3), due to time constant very little, equivalent to a differential circuit (this is the first subdifferential to input signal), V1 base stage is made
Turn into differentiated waveform with the electric current of colelctor electrode.Ic flows through inductance coil L2, and impression can be produced at L2 both ends and answers electromotive force eL (this is
Second subdifferential), when ic increases, eL is upper just lower negative, declines collector voltage uc, and when ic reduces, eL is under upper bears
Just, uc is made to increase, the coupled electric capacity C4 of this voltage and resistance R9 delivers to output end, while emitter voltage ue is through inductance L1
Deliver to output end.The two signals are superimposed in output end, form crisperding signal, and crispening circuit is that the video of an emitter-base bandgap grading output is put
Big device.It only changes in luminance signal partly works faster, and colelctor electrode just produces a crisperding signal, to improve output
The waveform of lower edge on voltage, so as to improve image definition.
Further, a kind of contour correction circuit, color sub-carrier is provided with electric capacity C1 connecting triodes V1 circuit
Trapper.
Further, a kind of contour correction circuit, luminance signal are the signals after high frequency attenuation.
The present invention compared with prior art, has the following advantages and advantages：The present invention changes in luminance signal
Partly work faster, colelctor electrode just produces a crisperding signal, to improve the waveform of lower edge on output voltage, so as to improve
Image definition.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the application
Point, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment
As shown in figure 1, a kind of contour correction circuit, including resistance R1, resistance R2, resistance R3, resistance R4, potentiometer R5,
Resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, inductance L1, inductance
L2, triode V1, luminance signal enter from resistance R1, and the resistance R1 connects with resistance R2, the resistance R2 connection resistance R1
The other end connecting triode V1 at end base stage, described electric capacity C1 one end are connected to the circuit that resistance R2 is connected with triode V1
On, its other end connection resistance R3, the other end connection resistance R4, the resistance R4 at the resistance R3 connections resistance capacitance C1 ends
Connect the other end ground connection at resistance R3 ends；A fixing end of the potentiometer R5 is connected to the line that resistance R3 is connected with resistance R4
Lu Shang, another fixing end ground connection, potentiometer R5 movable end connection resistance R6, the resistance R6 is amount saturation degree output end,
Electric capacity C2 one end ground connection, its other end are connected on the circuit that resistance R6 is connected with potentiometer R5；Inductance L2 mono- terminates electricity
Source, its other end are connected with triode V1 colelctor electrode, and the resistance R8 is connected in parallel on inductance L2 both ends, and described electric capacity C4 one end connects
It is connected on the circuit that resistance R8 is connected with triode V1, the connection of its other end resistance R9, resistance R9 other end connection resistance
R10, the other end ground connection at the resistance R10 connections resistance R9 ends；Electric capacity C3 one end connecting triode V1 emitter stage, its is another
End connection resistance R7, the resistance R7 other end ground connection；Described inductance L1 one end is connected to electric capacity C3 and is connected with triode V1
Circuit on, its other end is connected on the circuit that resistance R9 is connected with resistance R10, meanwhile, resistance R9 is connected with resistance R10
It is signal output part on circuit.
Color sub-carrier trapper is provided with electric capacity C1 connecting triodes V1 circuit.
Luminance signal is the signal after high frequency attenuation.
Above-described embodiment, the purpose of the present invention, technical scheme and beneficial effect are carried out further
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc., all should include
Within protection scope of the present invention.
Claims (3)
1. a kind of contour correction circuit, it is characterised in that including resistance R1, resistance R2, resistance R3, resistance R4, potentiometer R5, electricity
Hinder R6, resistance R7, resistance R8, resistance R9, resistance R10, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, inductance L1, inductance L2,
Triode V1, luminance signal enter from resistance R1, and the resistance R1 connects with resistance R2, the resistance R2 connections resistance R1 ends
Other end connecting triode V1 base stage, described electric capacity C1 one end are connected on the circuit that resistance R2 is connected with triode V1, its
The other end connects resistance R3, the other end connection resistance R4 at the resistance R3 connections resistance capacitance C1 ends, the resistance R4 connections
The other end ground connection at resistance R3 ends；A fixing end of the potentiometer R5 is connected to the circuit that resistance R3 is connected with resistance R4
On, another fixing end ground connection, potentiometer R5 movable end connection resistance R6, the resistance R6 are to measure saturation degree output end, institute
Electric capacity C2 one end ground connection is stated, its other end is connected on the circuit that resistance R6 is connected with potentiometer R5；The termination powers of inductance L2 mono-,
Its other end is connected with triode V1 colelctor electrode, and the resistance R8 is connected in parallel on inductance L2 both ends, electric capacity C4 one end connection
On the circuit that resistance R8 is connected with triode V1, the connection of its other end resistance R9, resistance R9 other end connection resistance R10,
The other end ground connection at the resistance R10 connections resistance R9 ends；Electric capacity C3 one end connecting triode V1 emitter stage, its other end connect
Connecting resistance R7, the resistance R7 other end ground connection；Described inductance L1 one end is connected to the line that electric capacity C3 is connected with triode V1
Lu Shang, its other end are connected on the circuit that resistance R9 is connected with resistance R10, meanwhile, the circuit that resistance R9 is connected with resistance R10
Upper is signal output part.
2. a kind of contour correction circuit according to claim 1, it is characterised in that in electric capacity C1 connecting triodes V1 line
Color sub-carrier trapper is provided with road.
3. a kind of contour correction circuit according to claim 1, it is characterised in that luminance signal is after high frequency attenuation
Signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710971943.2A CN107749959A (en) | 2017-10-18 | 2017-10-18 | A kind of contour correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710971943.2A CN107749959A (en) | 2017-10-18 | 2017-10-18 | A kind of contour correction circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107749959A true CN107749959A (en) | 2018-03-02 |
Family
ID=61253874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710971943.2A Pending CN107749959A (en) | 2017-10-18 | 2017-10-18 | A kind of contour correction circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107749959A (en) |
-
2017
- 2017-10-18 CN CN201710971943.2A patent/CN107749959A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180302 |