CN2373957Y - Radio frequency signal scramble control switch - Google Patents
Radio frequency signal scramble control switch Download PDFInfo
- Publication number
- CN2373957Y CN2373957Y CN99215509U CN99215509U CN2373957Y CN 2373957 Y CN2373957 Y CN 2373957Y CN 99215509 U CN99215509 U CN 99215509U CN 99215509 U CN99215509 U CN 99215509U CN 2373957 Y CN2373957 Y CN 2373957Y
- Authority
- CN
- China
- Prior art keywords
- triode
- radiofrequency signal
- choking
- winding
- diode
- 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.)
- Expired - Fee Related
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Abstract
The utility model discloses a radio frequency signal scrambling control switch which is applied in the cable TV. The switch comprises an outer shell and an electronic element circuit board, wherein a level switching circuit, a choke coil and a nonlinear device are arranged on the circuit board. The utility model utilizes the non-linear characteristic of the semiconductor device to cause that the inner parts of the radio frequency signal of the cable TV generate disturbance mutually. The disturbance is hard to be eliminated on the user side, so that the safe reliability of the cable TV scrambling control is increased greatly. The utility model has the advantages of simple structure, high safety, low cost, convenient use, etc.
Description
The utility model belongs to the image communication field, relates to a kind of at the radiofrequency signal scrambling control switch that has television system to use.
Cable TV station offers user's TV signal and distributes by headend equipment, amplifier, distributor and splitter, the effect that it just plays transmission, distributes.Owing to can not implement effective control to the user who does not pay the fees, thereby bring a lot of inconvenience for the management work of the cable TV station, so that be in a kind of more passive state.At this present situation, there is the people to propose the utility application of a kind of " TV user branch controller " to Patent Office of the People's Republic of China, its application number is: CN96222068.X.The technical solution of this patent is to utilize the high-low level of single-chip microcomputer output to constitute a radio-frequency switch circuit, utilize the quick conversion of high-low level to suppress radiofrequency signal from amplitude, make the agc circuit of television set not follow the tracks of the radiofrequency signal changes in amplitude, on image, promptly produce many horizontal stripes like this and disturb, the scrambling of certain user's received signal is controlled thereby reach.Because the control signal that this scheme is adopted is directly taken from the control output pin of single-chip microcomputer, this just makes the scrambling control signal of its output have only high and low two kinds of variations (5V, 0V).And this signal can also arrive user side by coupling capacitance, like this by the user of scrambling as long as utilize the method for ride gain can eliminate interference signal at its receiving terminal.Therefore this scheme is very unreliable in concrete the application, can not fundamentally implement effective control to stealing the user who receives TV signal.
The purpose of this utility model is will provide a kind of can carry out scrambling control to the radiofrequency signal that the cable TV subscriber receives, and can effectively prevent the radiofrequency signal scrambling control switch that bad user takes countermeasure to crack again.
The purpose of this utility model is achieved in that this switch comprises shell and electronic element circuit plate, be provided with level shifting circuit, choking-winding and nonlinear device in the circuit board, the output of the level shifting circuit input by choking-winding and nonlinear device is joined, again nonlinear device is serially connected between radiofrequency signal input, the output interface by coupling capacitance.Described level shifting circuit is made of triode V and resistance R, its nonlinear device can select for use nonlinear characteristic preferably diode fill the post of.
The utility model is owing to utilize the nonlinear characteristic of semiconductor device, when scrambled signals makes it be operated in the nonlinear operation district, the inner generation mutually of the radiofrequency signal that makes cable TV upset, this upset is difficult to get rid of at user side, thereby has greatly improved the security reliability of cable TV scrambling control.Have advantages such as simple in structure, safe and reliable, with low cost, easy to use.
Concrete structure of the present utility model is provided by following execution mode and accompanying drawing thereof:
Fig. 1 is that the circuit of radiofrequency signal scrambling control switch is formed schematic diagram;
Fig. 2 is that the circuit of second kind of execution mode of the utility model is formed schematic diagram;
Fig. 3 is that the circuit of the third execution mode of the utility model is formed schematic diagram.
Describing concrete structure of the present utility model in detail below in conjunction with accompanying drawing forms and execution mode:
This switch mainly comprises shell and electronic element circuit plate, be provided with level shifting circuit, choking-winding and nonlinear device in the circuit board, the output of the level shifting circuit input by choking-winding and nonlinear device is joined, utilize level shifting circuit again this nonlinear device to be serially connected in the radio frequency signal channels that is made of radiofrequency signal input, output by coupling capacitance from the high and low level conversion of control end for adapting to the control level that nonlinear device works in linear work district or nonlinear operation district.Described level shifting circuit can be by triode V
1And the resistance R formation, its nonlinear device can be selected nonlinear characteristic diode D preferably for use
1Or triode V
2Fill the post of.
Specifically narrate three kinds of execution modes below by example:
[execution mode one] (as shown in Figure 1), described nonlinear device adopted detector diode D
1, with diode D
1By coupling capacitance C
1, C
2In the radio frequency signal channels that the input of serial connection radiofrequency signal, output constitute; With choking-winding L
1An end and diode D
1Anodal continuous, the other end and triode V
1Collector electrode link to each other; With choking-winding L
2An end and diode D
1Negative pole link to each other, the other end connects triode V
1Emitter arrive public ground again; Triode V
1Collector electrode pass through resistance R
3Connect power supply and go into end, triode V
1Base stage pass through resistance R
1Join with control end, at triode V
1Base stage and public ground between also be parallel with biasing resistor R
2When control end provides low level, triode V
1Be in cut-off state, supply voltage passes through resistance R
3, choking-winding L
1Be added to diode D
1Positive pole, make diode D
1Work in the linear work district, this moment, its effect was equivalent to resistance, and radiofrequency signal can be passed through undisturbedly.When control end provided high level, this high level was through resistance R
1, R
2Dividing potential drop after be added to triode V
1Base stage on, thereby the voltage of control sets electrode makes diode D
1Work in the nonlinear operation district (as diode D
1When adopting germanium diode, V
1Be in the saturation conduction state, then V
1Voltage≤0 of collector electrode, 3V, this voltage will make germanium diode D
1Work in the nonlinear operation district) because the carrier frequency in the cable TV spectrum of radio frequency signals is extremely many, each frequency will be by diode D
1Non-linear and produce various mixed and disorderly crosstalking mutually, on image, produce many assorted lines and disturb.This moment, the horizontal stripe that then also produces the mask formula on image simultaneously disturbed if make the high and low level of control end do quick conversion, thereby reached the purpose of dual Interference Control user's received RF signal.
The also available triode V of [execution mode two] mode one described nonlinear device
2Replace (as shown in Figure 2), this moment can be with triode V
2Base stage meet choking-winding L
1Pass through resistance R again
5Connect power supply and go into end, emitter meets choking-winding L
2, collector electrode is by choking-winding L
3And resistance R
4Connect power supply and go into end.The collector and emitter that passes through joins with input, the output of radiofrequency signal respectively.When control end provides low level, triode V
1Be in cut-off state, supply voltage passes through resistance R
5, choking-winding L
1Be added to triode V
2Base stage on, thereby make it to be in the linear work district, this moment radiofrequency signal normally pass through.When control end provided high level, this high level was through resistance R
1, R
2Dividing potential drop after be added to triode V
1Base stage, control triode V
1Collector voltage, also control simultaneously triode V
2Base voltage and make it to be in the nonlinear operation district, crosstalk mutually thereby the cable TV radiofrequency signal is produced.Resistance R
4Be in order to limit triode V
2Operating current.
[execution mode three] the utility model also can be with diode D in the mode one
1With triode V
1Parallel-connection structure change cascaded structure into, both with triode V
1Emitter pass through resistance R
7Connect public ground, at triode V
1Base stage and power supply go into a divider resistance R in parallel between the end
6, with biasing resistor R
2Be connected on triode V
1Base stage and public ground between, triode V
1Base stage pass through resistance R
1Join with control end.Triode V
1Collector electrode by choking-winding L
2Be connected to diode D
1Negative pole, diode D
1Positive pole by choking-winding L
1Directly connect power supply and go into end.When control end provides high level, make it to be in the saturation conduction state through the resistance R dividing potential drop, thereby make diode D
1Be in the linear work district, this moment, radiofrequency signal was normally passed through.When the end of control provided low level, supply voltage was through R
6, R
1, R
2Dividing potential drop after be added to triode V
1Base stage make it to be in the nonlinear operation district, crosstalk mutually thereby the cable TV radiofrequency signal is produced.Resistance R among the figure
7Be in order to limit diode D
1In the electric current that flows through.
Choking-winding L in the utility model is in order to isolate radiofrequency signal, and capacitor C is for isolated DC.Can select one by above-mentioned three kinds of modes and implement in concrete the application, the model and the parameter of its main components and parts are as follows:
Diode: D
1Be the 2AP32 type;
Triode: V
1Be 9013 types, V
2Be the 2N797 type;
Choking-winding: L
1=L
2=L
3=10uH;
Electric capacity: C
1=C
2=1nF;
Resistance: R
1=R
2=R
5=R
6=10K Ω, R
3=R
4=R
7=1.5K Ω;
Supply voltage: 5V;
Control end input: 0V, 5V;
Claims (7)
1, a kind of radiofrequency signal scrambling control switch, comprise shell and electronic element circuit plate, it is characterized in that: on described wiring board, be provided with level shifting circuit, choking-winding and nonlinear device, the output of the level shifting circuit input by choking-winding and nonlinear device is joined, nonlinear device is connected in the radiofrequency signal interface by coupling capacitance.
2, a kind of radiofrequency signal scrambling control switch according to claim 1 is characterized in that: described nonlinear device select for use nonlinear characteristic preferably diode fill the post of.
3, a kind of radiofrequency signal scrambling control switch according to claim 1 and 2, it is characterized in that: described level shifting circuit is made of triode V and resistance R.
4, a kind of radiofrequency signal scrambling control switch according to claim 1, it is characterized in that: described nonlinear device selects for use triode to fill the post of.
5, a kind of radiofrequency signal scrambling control switch according to claim 1 and 2, it is characterized in that: described nonlinear device is detector diode D
1, diode D
1Anodal by coupling capacitance C
1Link to each other with the radiofrequency signal input interface, its negative pole is by coupling capacitance C
2Link to each other with the radiofrequency signal output interface; With choking-winding L
1An end and diode D
1Positive pole link to each other the other end and triode V
1Collector electrode link to each other; With choking-winding L
2An end and diode D
1Negative pole link to each other, the other end connects three utmost point V
1Emitter arrive public ground again; Triode V
1Collector electrode pass through resistance R
3Connect power supply and go into end, triode V
1Base stage pass through resistance R
1Join with control end, at triode V
1Base stage and public ground between also be parallel with biasing resistor R
2
6, a kind of radiofrequency signal scrambling control switch according to claim 3, it is characterized in that: described nonlinear device is triode V
2, with triode V
2Base stage meet choking-winding L
1Pass through resistance R again
5Go into end with power supply and join, emitter meets choking-winding L
2, collector electrode is by choking-winding L
3And resistance R
4Connect power supply and go into end; The collector and emitter that passes through links to each other with input, the output interface of radiofrequency signal respectively.
7, a kind of radiofrequency signal scrambling control switch according to claim 1, it is characterized in that: described level shifting circuit is with triode V
1Emitter pass through resistance R
7Connect public ground, at triode V
1Base stage and power supply go into a divider resistance R in parallel between the end
6, with biasing resistor R
2Be connected on triode V
1Base stage and public ground between, triode V
1Base stage pass through resistance R
1Join with control end; Triode V
1Collector electrode by choking-winding L
2Be connected to diode D
1Negative pole, diode D
1Positive pole by choking-winding L
1Directly connect power supply and go into end; Diode D
1Positive and negative electrode, respectively by coupling capacitance C
1, C
2Link to each other with radiofrequency signal input, output interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99215509U CN2373957Y (en) | 1999-06-23 | 1999-06-23 | Radio frequency signal scramble control switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99215509U CN2373957Y (en) | 1999-06-23 | 1999-06-23 | Radio frequency signal scramble control switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2373957Y true CN2373957Y (en) | 2000-04-12 |
Family
ID=34007426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99215509U Expired - Fee Related CN2373957Y (en) | 1999-06-23 | 1999-06-23 | Radio frequency signal scramble control switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2373957Y (en) |
-
1999
- 1999-06-23 CN CN99215509U patent/CN2373957Y/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 |