CN2419759Y - Television signal scanning rate modulation pulse generator - Google Patents
Television signal scanning rate modulation pulse generator Download PDFInfo
- Publication number
- CN2419759Y CN2419759Y CN 00213457 CN00213457U CN2419759Y CN 2419759 Y CN2419759 Y CN 2419759Y CN 00213457 CN00213457 CN 00213457 CN 00213457 U CN00213457 U CN 00213457U CN 2419759 Y CN2419759 Y CN 2419759Y
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- CN
- China
- Prior art keywords
- triode
- signal
- modulation pulse
- differential
- resistance
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- Expired - Fee Related
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Abstract
The utility model relates to a television signal scanning rate modulation pulse generator. R, G and B signals of a visual amplification level for a television respectively pass through a sampling circuit which is composed of a resistor and a capacitor which connected in parallel, wherein, the R, G and B signals are connected in parallel, and then the signals are connected with the base electrode of a differential triode after an amplification triode and an emitter follower which have a common base electrode. Pulses can be modulated by the scanning rate of television signals which are output from the differential terminal of the differential triode. The device can realize the modulation pulse signals of VM only by a plurality of discrete components, so that the cost can be saved. The utility model has the advantages of reliable operation and obvious image effects.
Description
The utility model belongs to the formation device of kinds of displays signal scanning velocity modulation pulse signal.
Both scan velocity modulation abbreviates VM (Velocity Modulation) as, and its effect is to make beam scan velocity do to quicken or slow down scanning according to the transition edge of luminance signal, and the image contour that brightness is had significant change is more clear, distincter.This definition compensation effect is when visual briliancy is high more, and the effect that vividness improves is also obvious more.At present, existing this VM, but their VM modulated pulse signal majority is from video frequency processing chip, or uses special integrated circuit to form the modulated pulse signal of VM, but these two kinds scheme pulse signal image effect is not obvious or cost is too high; All unsatisfactory.
The purpose of this utility model is, for addressing the above problem, provides a kind of and realizes the modulated pulse signal of VM with the minority device, the TV signal both scan velocity modulation pulse generating unit of with low cost, dependable performance.
For achieving the above object, the utility model is to realize like this, a kind of TV signal both scan velocity modulation pulse generating unit, it is characterized in that: television set look put level R, G, B signal respectively via in parallel behind resistance and the electric capacity sampling loop that forms in parallel, connect the common base amplifying triode then and establish, the differential end outgoing television signal both scan velocity modulation pulse of this differential triode with the base stage that is connected the differential triode behind the device triode.
The physical circuit of above-mentioned differential triode is that the collector electrode of triode is connected power supply by the shunt circuit of resistance and inductance and the shunt circuit of resistance and electric capacity; Its emitter passes through grounding through resistance; Described inductance connects output.
Advantage of the present utility model and good effect are that this device has only used several discrete components of minority just to realize the modulated pulse signal of VM, has saved cost; And use very reliably, image effect is obvious.
Below in conjunction with accompanying drawing the utility model is described in further detail.
Fig. 1 is the circuit diagram of an embodiment of the utility model;
Fig. 2 is the output curve diagram of an embodiment of the utility model.
As shown in the figure, a kind of TV signal both scan velocity modulation pulse generating unit, looking the R signal of putting level by television set takes a sample via resistance R 1 and capacitor C 1 sampling loop that forms in parallel, the G signal is via resistance R 2 and the capacitor C 2 sampling loop samplings that form in parallel, the B signal forms Y-signal with in parallel merging of each sampled signal after taking a sample via resistance R 3 and capacitor C 3 sampling loops that form in parallel, connect common base amplifying triode V1 then and establish with device triode V2, its output after treatment connects the base stage of differential triode V3, the differential end outgoing television signal both scan velocity modulation pulse VM OUT of this differential triode V3.
Above-mentioned common base amplifying triode V1 and establishing as shown in the figure with device triode V2 physical circuit, the base stage of triode V1 is an input, its emitter is by resistance R 6 ground connection, simultaneously the shunt circuit ground connection by diode D1, D2 and capacitor C 4; Its base stage is connected power supply VCC by resistance R 4 with resistance R 5 respectively with collector electrode, and the collector electrode of triode V1 connects the base stage of triode V2; The collector electrode of triode V2 connects power supply VCC, and its emitter is by resistance R 8 ground connection, and the base stage of triode V2 also is connected the base stage of differential triode V3 with capacitor C 5 by resistance R 7 simultaneously.
As shown in the figure, the physical circuit of differential triode V3 is that the collector electrode of triode V3 is connected power supply VCC by the resistance R 12 and shunt circuit of the inductance L 1 and shunt circuit of resistance R 11 and capacitor C 6; Its emitter is by resistance R 13 ground connection, and the base stage of this triode V3 is connected power supply VCC by capacitor C 5 with resistance R 9 simultaneously, also by capacitor C 5 and resistance R 10 ground connection; Described inductance L 1 output.
When this device used, when sampling and synthetic Y-signal from look R, a G of putting the level input, B small-signal do not change or change when slow, C6 can be considered open circuit, and L1 can be considered short circuit, so the output of VMOUT no pulse; And change when very fast when Y-signal, C6 can be considered short circuit, so the L1 both end voltage is that VMOUT is a differential form, and the rate of change that can obtain Y-signal is as shown in Figure 2.VMOUT outputs to speed control coil through recommending again after amplification, shaping, with line deflector coil scan synthesis magnetic field, work quickens or deceleration scanning according to the transition edge of luminance signal to realize beam scan velocity.
Claims (2)
1. TV signal both scan velocity modulation pulse generating unit, it is characterized in that: television set look put level R, G, B signal respectively via in parallel behind resistance and the electric capacity sampling loop that forms in parallel, then by common base amplifying triode (V1) with establish the base stage that is connected differential triode (V3) with device triode (V2) back, the differential end outgoing television signal both scan velocity modulation pulse (VM OUT) of this differential triode (V3).
2. TV signal both scan velocity modulation pulse generating unit according to claim 1 is characterized in that: the physical circuit of above-mentioned differential triode (V3) is that the collector electrode of triode (V3) is connected power supply (VCC) by resistance (R12) and the shunt circuit of inductance (L1) and the shunt circuit of resistance (R11) and electric capacity (C6); Its emitter is by resistance (R13) ground connection; Described inductance (L1) connects output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00213457 CN2419759Y (en) | 2000-02-04 | 2000-02-04 | Television signal scanning rate modulation pulse generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00213457 CN2419759Y (en) | 2000-02-04 | 2000-02-04 | Television signal scanning rate modulation pulse generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2419759Y true CN2419759Y (en) | 2001-02-14 |
Family
ID=33579749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00213457 Expired - Fee Related CN2419759Y (en) | 2000-02-04 | 2000-02-04 | Television signal scanning rate modulation pulse generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2419759Y (en) |
-
2000
- 2000-02-04 CN CN 00213457 patent/CN2419759Y/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 | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |