CN2382172Y - Satellite TV top device - Google Patents
Satellite TV top device Download PDFInfo
- Publication number
- CN2382172Y CN2382172Y CN99221874U CN99221874U CN2382172Y CN 2382172 Y CN2382172 Y CN 2382172Y CN 99221874 U CN99221874 U CN 99221874U CN 99221874 U CN99221874 U CN 99221874U CN 2382172 Y CN2382172 Y CN 2382172Y
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- China
- Prior art keywords
- triode
- signal
- output
- emitter
- top setting
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- Expired - Fee Related
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Abstract
The utility model relates to a satellite TV top box, which comprises output Y and C signals. The output Y and C signals respectively pass through the same filter circuit and driving triode base, and then the emitter output ends of the output Y and C signals are connected with the base of an inverted triode jointly. The emitter of the inverted triode is connected with the base of an amplifier triode, and the emitter of the amplifier triode is used for outputting. Thus, the output Y and C signals are filtered, are isolated by a driving triode, and are amplified by composite phase inversion, and then good composite video signals which conform to the standard of a professional receiver can be output. The utility model can also directly output good Y and C signals.
Description
The utility model belongs to electronic technology, is specifically related to dock the improvement that improves the circuit of vision signal in the receiving satellite TV signal device.
Before the utility model is made, it is that problems such as video frequency response, attenuation outside a channel, light tone gain time-delay, luminance non-linearity appear in the vision signal that produces in the existing satellite television top setting box of TMXDAV71XX that master chip adopts model, influence the signal of exporting to TV behind the receiving satellite signal, make demonstration satellite programming of low quality of TV.Do not have good solution now, especially can not take into account above-mentioned performance index simultaneously; Make above-mentioned performance index can reach excellent value simultaneously.
Goal of the invention of the present utility model is for addressing the above problem, a kind of satellite television top setting box of exporting good composite video signal being provided.Another goal of the invention of the present utility model is that this satellite television top setting box can also be exported good Y, C signal.
For the utility model that achieves the above object is to realize like this, a kind of satellite television top setting box, the Y, the C signal that comprise output, Y, C signal are respectively through identical filter circuit and driving transistor base, its emitter output separately connects the base stage of inverted triode jointly then, the emitter of this inverted triode connects the base stage of amplifying triode, the emitter output of this amplifying triode.
A kind of improvement of described satellite television top setting box is that the emitter of above-mentioned driving triode connects Y-signal output and the output of C signal respectively.
A kind of improvement of described satellite television top setting box is that the Y-signal filter circuit of above-mentioned satellite television top setting box is that Y-signal passes through the base stage that the common parallel circuits of forming of inductance, electric capacity and series capacitance connects triode; Ground connection between the series capacitance wherein.
A kind of improvement of described satellite television top setting box is that the C signal filter circuit of above-mentioned satellite television top setting box is the C signal connects triode by inductance and the common parallel circuits of forming of series capacitance a base stage; Ground connection between the series capacitance wherein.
Advantage of the present utility model and good effect are, the isolation of Y, the process filtering of C signal and driving triode, bad Signal Spacing such as the video frequency response of carrying secretly in the time of Y, C can being produced, attenuation outside a channel can not influence the operation (can not occur as problem such as will the back level burning) of back level; After amplifying, can export composite video signal good, that meet professional receiver standard through compound paraphase.This satellite television top setting box is good Y, the C signal of output directly.
Below in conjunction with accompanying drawing the utility model is described in further detail.
Fig. 1 is the circuit block diagram of an embodiment of the utility model;
Fig. 2 is the circuit diagram of an embodiment of the utility model.
As shown in Figure 1, a kind of satellite television top setting box comprises Y, the C signal of output; Y-signal is connected filter circuit and drive circuit separately respectively with the C signal, and this signal can be selected to export Y, the C signal after driving or be for further processing according to different needs.Y after the driving, C signal then mix the back paraphase if do not select output, and the mixed signal after paraphase paraphase is more once amplified then, again through promoting and high-frequency circuit output.So just can drive, mix, amplify, drive again, promote radio-frequency component, suppress the composite video signal that clutter produces outside the video frequency band at Y, C signal; There are not problems such as attenuation outside a channel, light tone gain time-delay, luminance non-linearity.
Draw the physical circuit figure that can produce according to above-mentioned technical scheme, as shown in Figure 2.
Y, the C signal directly exported behind the satellite television top setting box receiving satellite signal pass through identical filter circuit and drive circuit respectively, and filter circuit is identical on circuit structure with drive circuit.Capacitor C 9 and the C2 common parallel circuits formed of C1, the 470P of series capacitance 470 base stage that connect triode V1 of Y-signal by 3.3 μ H inductance L 1,100P; Ground connection between series capacitance C1, the C2 wherein.The C signal connects the base stage of triode V2 by the common parallel circuits of forming of the C4 of C3, the 330P of 3.3 μ H inductance L 2 and series capacitance 330P; Ground connection between series capacitance C3, the C4 wherein.The base stage of triode V1 connects power supply by the resistance R 1 of 68K, passes through resistance R 2 ground connection of 20K simultaneously; The base stage of same triode V2 connects power supply by the resistance R 5 of 33K, simultaneously by 20K resistance R 6 ground connection.The emitter of triode V1 is by resistance R 3 ground connection of 220 Ω, and the emitter of triode V2 is by resistance R 7 ground connection of 220 Ω.The emitter of triode V1 connects resistance R 4 outputs of 220 Ω, the emitter of triode V2 connects resistance R 8 outputs of 220 Ω, its emitter output separately connects the base stage of inverted triode V3 jointly then, the collector electrode of triode V3 connects power supply by the resistance R 10 of 270 Ω, its emitter is by resistance R 9 ground connection of 220 Ω, the collector electrode of inverted triode V3 connects the base stage of amplifying triode V4, and its emitter is by resistance R 111 ground connection of 75 Ω simultaneously; The collector electrode of this amplifying triode V4 connects power supply by the resistance R 12 of 39 Ω, also is connected power supply by the electric capacity of 51P and the resistance R 13 of 39 Ω, and its emitter is by 100 μ electric capacity output composite video signal.Can directly export Y-signal and C signal simultaneously from the emitter of triode V1 and triode V2.
Claims (4)
1. satellite television top setting box, the Y, the C signal that comprise output, it is characterized in that: Y, C signal are respectively through identical filter circuit and driving triode (V1, V2) base stage, its emitter output separately connects the base stage of inverted triode (V3) jointly then, the emitter of this inverted triode (V3) connects the base stage of amplifying triode (V4), the emitter output of this amplifying triode (V4).
2. satellite television top setting box according to claim 1 is characterized in that: the emitter of above-mentioned driving triode (V1, V2) connects Y-signal output and the output of C signal respectively.
3. satellite television top setting box according to claim 1 and 2 is characterized in that: the Y-signal filter circuit of above-mentioned satellite television top setting box is that Y-signal passes through the base stage that the common parallel circuits of forming of inductance (L1), electric capacity (C9) and series capacitance (C1, C2) connects triode (V1); Ground connection between the series capacitance (C1, C2) wherein.
4. satellite television top setting box according to claim 1 and 2 is characterized in that: the C signal filter circuit of above-mentioned satellite television top setting box is the C signal connects triode (V2) by inductance (L2) and the common parallel circuits of forming of series capacitance (C3, C4) a base stage; Ground connection between the series capacitance (C3, C4) wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99221874U CN2382172Y (en) | 1999-08-03 | 1999-08-03 | Satellite TV top device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99221874U CN2382172Y (en) | 1999-08-03 | 1999-08-03 | Satellite TV top device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2382172Y true CN2382172Y (en) | 2000-06-07 |
Family
ID=34012369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99221874U Expired - Fee Related CN2382172Y (en) | 1999-08-03 | 1999-08-03 | Satellite TV top device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2382172Y (en) |
-
1999
- 1999-08-03 CN CN99221874U patent/CN2382172Y/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 |