CN2879565Y - Selection circuit for multiple types of TV signal - Google Patents
Selection circuit for multiple types of TV signal Download PDFInfo
- Publication number
- CN2879565Y CN2879565Y CN 200620080984 CN200620080984U CN2879565Y CN 2879565 Y CN2879565 Y CN 2879565Y CN 200620080984 CN200620080984 CN 200620080984 CN 200620080984 U CN200620080984 U CN 200620080984U CN 2879565 Y CN2879565 Y CN 2879565Y
- Authority
- CN
- China
- Prior art keywords
- signal
- filter
- connects
- saw
- acoustic wave
- 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
Links
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
The utility model discloses a selection circuit for multiple types of TV signal which belongs to TV set circuit technology field. The utility model includes a tv tuner for receiving RF TV signal; a sound surface wave filter for filtering the audio signal and the video signal received by the tuner; a processor for receiving the processed audio signal and the processed video signal output by the sound surface wave filter; a gating circuit, whose control terminal receives the control signal output by the processor, converts the conduction state of the input terminal of the sound surface wave filter according to the received control signal. The utility model adds a simple selection circuit into the current TV set circuit, and realizes the selection of multiple types of TV signal by employing only a few elements, and the TV signal of multiple types can be decoded by the same circuit so as to enhance the generality and expansibility of the TV circuit, therefore, the device cost can be also reduced and the market competitiveness of the TV production can be enhanced.
Description
Technical field
The utility model relates to a kind of improvement of TV set circuit, specifically, relates to a kind of being applied in the TV set circuit, realizes the selection circuit to multiple standard in the TV signal.
Background technology
At present, include multiple standard in the TV signal, wherein, vision signal includes PAL, NTSC and three kinds of standards of SECAM, and audio signal includes D/K, I, four kinds of standards of B/G, M.Because various countries' standard difference, the combination of these several standards just has a variety of signal formats.Under these circumstances, how to make the circuit of design have versatility, different signals is decoded by same circuit,, just become present television set and make one of subject matter that needs to be resolved hurrily in the industry with this adaptability that strengthens existing television set.
Summary of the invention
The utility model is in order to solve in the prior art TV set circuit compatible multiple signal format simultaneously, thereby reduced the problem of tv product versatility, the selection circuit of the multiple standard of a kind of novel TV machine is provided, realized effective selection of secam television signal by simple circuit configuration, make the TV signal of different systems expand the versatility of TV set circuit by the output of decoding of same circuit.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
The selection circuit of the multiple standard of a kind of TV signal comprises tuner, received RF TV signal; SAW (Surface Acoustic Wave) filter is carried out Filtering Processing to audio signal and vision signal that tuner receives; Processor, audio signal and vision signal after the processing of reception SAW (Surface Acoustic Wave) filter output; Gating circuit, the control signal of the control end receiving processor of described gating circuit output, and change the connected state of SAW (Surface Acoustic Wave) filter input according to the control signal that receives.
As further qualification to technique scheme, described SAW (Surface Acoustic Wave) filter comprises audio sound surface wave filter and video SAW (Surface Acoustic Wave) filter, all include two signal input tube pin, described signal input tube pin connects the output of tuner through gating circuit, described gating circuit is according to ground connection of two signal input tube pin of the control signal guide sound surface wave filter of processor output, and another connects the output of tuner.
As further limiting again to technique scheme, two signal input tube pin of described audio sound surface wave filter switching diode of respectively hanging oneself on the one hand connects the output of described tuner, the pull-up resistor of respectively hanging oneself on the other hand connects a direct current power supply, and connects the collector electrode of a NPN type triode separately; The equal ground connection of emitter of described two NPN type triodes, a GPIO mouth of the base stage connection processing device of one of them triode, its collector electrode connects the base stage of another triode.
In two signal input tube pin of described video SAW (Surface Acoustic Wave) filter, an output that directly connects described tuner, and connect the negative pole of a switching diode, the anodal one side of described switching diode connects described DC power supply, another signal input tube pin that connects the video SAW (Surface Acoustic Wave) filter on the other hand, the collector electrode that connects a NPN type triode simultaneously, the grounded emitter of described NPN type triode, another GPIO mouth of base stage connection processing device.
As the further qualification again to technique scheme, the output of described tuner connects two signal output pins of described SAW (Surface Acoustic Wave) filter through the capacitance of series connection.
Compared with prior art, advantage of the present utility model and good effect are: the utility model is by setting up simple selection circuit in existing TV set circuit, utilize less components and parts to realize the selection of various standards in the TV signal, the TV signal of different systems can be decoded by same circuit, the versatility and the autgmentability of TV set circuit have been strengthened greatly, effectively reduce equipment cost, improved the market competitiveness of tv product.
Description of drawings
Fig. 1 is the selection circuit of the utility model sound intermediate frequency part;
Fig. 2 is the selection circuit of video section in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done explanation in further detail.
Selection circuit of the present utility model can be selected input to the audio signal of the vision signal of PAL, NTSC and three kinds of standards of SECAM and D/K, I, B/G, four kinds of standards of M, comprise audio sound surface wave filter Z100 and video SAW (Surface Acoustic Wave) filter Z101, respectively the audio signal and the vision signal of input are carried out Filtering Processing, and the sound after will handling, vision signal output among the processor CPU.Wherein, the selection circuit of audio-frequency unit is referring to shown in Figure 1.
Among Fig. 1, input 1 pin of SAW (Surface Acoustic Wave) filter Z100,2 pin connect capacitance C1 through switching diode VD1, VD2 respectively, and connect the output of tuner JF by described capacitance C1.According to the characteristic of SAW (Surface Acoustic Wave) filter Z100, when the sound standard is D/K, B/G or I standard, need the 2 pin ground connection of SAW (Surface Acoustic Wave) filter Z100,1 pin received audio signal; When the sound standard is M, need 1 pin ground connection, therefore 2 pin received audio signals, have designed the connection request that selection circuit shown in Figure 1 satisfies SAW (Surface Acoustic Wave) filter Z100 input pin.Wherein, 1 pin of described SAW (Surface Acoustic Wave) filter Z100 connects DC power supply VCC through pull-up resistor R3 on the one hand, connects the collector electrode of a NPN type triode V2 on the other hand.The grounded emitter of described NPN type triode V2, base stage connect the collector electrode of another NPN type triode V1 through resistance R 4.The base stage of described triode V1 connects the GPIO mouth of CPU through resistance R 1, grounded emitter, and collector electrode connects DC power supply VCC through pull-up resistor R2 on the one hand, connects 2 pin of described SAW (Surface Acoustic Wave) filter Z100 on the other hand.The 3 pin ground connection of described SAW (Surface Acoustic Wave) filter Z100,4 pin, 5 pin connect CPU, audio signal SIF2, SIF1 after CPU output Filtering Processing.When selecting the audio signal of D/K, B/G or I standard, GPIO mouth output high-level control signal SAW1 by CPU, control triode V1 conducting, drag down its collector potential, at this moment, 2 pin of SAW (Surface Acoustic Wave) filter Z100 pass through the collector and emitter ground connection of triode V1, and make the base potential of triode V2 be low level.So triode V2 ends, current collection is high level very, switching diode VD1 conducting, and the intermediate-freuqncy signal that tuner JF receives, outputs among the CPU through after the bandpass filtering treatment by 1 pin that capacitance C1, diode VD1 are input to SAW (Surface Acoustic Wave) filter Z100.In like manner, when selecting the audio signal of M standard, CPU output low level control signal SAW1, at this moment, triode V1 ends, and its current collection is high level very, switching diode VD2 conducting, intermediate-freuqncy signal, outputs among the CPU through after the bandpass filtering treatment by 2 pin that capacitor C 1 and diode VD2 enter SAW (Surface Acoustic Wave) filter Z100.Simultaneously, the base stage of triode V2 is a high level, control triode V2 conducting, and 1 pin of SAW (Surface Acoustic Wave) filter Z100 is by the collector and emitter ground connection of triode V2, and then satisfied the characteristic of described SAW (Surface Acoustic Wave) filter Z100, realized the selection input of audio signal.
The selection circuit of video section as shown in Figure 2, input 1 pin of video SAW (Surface Acoustic Wave) filter Z101 connects the output of tuner JF through capacitance C1-2, and connects input 2 pin of SAW (Surface Acoustic Wave) filter Z101 through switching diode VD1-2.The negative pole of described switching diode VD1-2 connects 1 pin of SAW (Surface Acoustic Wave) filter Z101, anodal its 2 pin that connects, and through resistance R 2-2, R1-2 connection DC power supply VCC.2 pin of described SAW (Surface Acoustic Wave) filter Z101 connect the collector electrode of NPN type triode V1-2, its grounded emitter.Another GPIO mouth of CPU is exported conducting and the cut-off state of high and low level controling signal SAW2 control triode V1-2, and then is changed the connection status of SAW (Surface Acoustic Wave) filter Z101 input 1 pin, 2 pin through the base stage that resistance R 5-2 connects triode V1-2.The 3 pin ground connection of described SAW (Surface Acoustic Wave) filter Z101,4 pin, 5 pin connect CPU, vision signal VIF2, VIF1 after CPU output Filtering Processing.When selecting the vision signal of PAL, TSC-system formula, by the GPIO mouth output high level SAW2 signal of CPU, control triode V1-2 conducting, and then make the 2 pin ground connection of SAW (Surface Acoustic Wave) filter Z101,1 foot meridian capacitor C1-2 receives the vision signal of tuner JF output.When selecting the vision signal of Sequential Color and Memory system formula, CPU sends low level SAW2 signal, control triode V1-2 ends, and at this moment, the current collection of triode V1-2 is high level very, diode VD1-2 conducting, 1 pin of SAW (Surface Acoustic Wave) filter Z101 and 2 pin short circuits, the common Sequential Color and Memory system formula vision signal that receives from tuner JF is exported to CPU by its output 4 pin, 5 pin after bandpass filtering treatment, and then satisfied the characteristic of described SAW (Surface Acoustic Wave) filter Z101, realized the selection input of vision signal.
Television set standard of the present utility model selects circuit design very ingenious, utilize less components and parts to realize the selection of the various standards of TV signal, and all components and parts are all very common, and this makes this circuit have very strong versatility and autgmentability, and greatly reduce the cost of product.Certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection range of the present utility model.
Claims (5)
1. the selection circuit of the multiple standard of TV signal comprises
Tuner, received RF TV signal;
SAW (Surface Acoustic Wave) filter is carried out Filtering Processing to audio signal and vision signal that tuner receives;
Processor, audio signal and vision signal after the processing of reception SAW (Surface Acoustic Wave) filter output; It is characterized in that: also comprise
One gating circuit, the control signal of the control end receiving processor of described gating circuit output, and change the connected state of SAW (Surface Acoustic Wave) filter input according to the control signal that receives.
2. the selection circuit of the multiple standard of TV signal according to claim 1, it is characterized in that: described SAW (Surface Acoustic Wave) filter comprises audio sound surface wave filter and video SAW (Surface Acoustic Wave) filter, all include two signal input tube pin, described signal input tube pin connects the output of tuner through gating circuit, described gating circuit is according to ground connection of two signal input tube pin of the control signal guide sound surface wave filter of processor output, and another connects the output of tuner.
3. the selection circuit of the multiple standard of TV signal according to claim 2, it is characterized in that: two signal input tube pin of described audio sound surface wave filter switching diode of respectively hanging oneself on the one hand connects the output of described tuner, the pull-up resistor of respectively hanging oneself on the other hand connects a direct current power supply, and connects the collector electrode of a NPN type triode separately; The equal ground connection of emitter of described two NPN type triodes, a GPIO mouth of the base stage connection processing device of one of them triode, its collector electrode connects the base stage of another triode.
4. according to the selection circuit of claim 2 or the multiple standard of 3 described TV signal, it is characterized in that: in two signal input tube pin of described video SAW (Surface Acoustic Wave) filter, an output that directly connects described tuner, and connect the negative pole of a switching diode, the anodal one side of described switching diode connects described DC power supply, another signal input tube pin that connects the video SAW (Surface Acoustic Wave) filter on the other hand, the collector electrode that connects a NPN type triode simultaneously, the grounded emitter of described NPN type triode, another GPIO mouth of base stage connection processing device.
5. the selection circuit of the multiple standard of TV signal according to claim 4 is characterized in that: the output of described tuner connects two signal output pins of described SAW (Surface Acoustic Wave) filter through the capacitance of series connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620080984 CN2879565Y (en) | 2006-02-10 | 2006-02-10 | Selection circuit for multiple types of TV signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620080984 CN2879565Y (en) | 2006-02-10 | 2006-02-10 | Selection circuit for multiple types of TV signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2879565Y true CN2879565Y (en) | 2007-03-14 |
Family
ID=37861983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620080984 Expired - Fee Related CN2879565Y (en) | 2006-02-10 | 2006-02-10 | Selection circuit for multiple types of TV signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2879565Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102256082A (en) * | 2011-07-25 | 2011-11-23 | 广州视源电子科技有限公司 | Television capable of supporting multiple digital television standards |
| CN109068077A (en) * | 2018-10-11 | 2018-12-21 | 中国人民解放军第七五医院 | Energy-saving control device based on TV signal |
-
2006
- 2006-02-10 CN CN 200620080984 patent/CN2879565Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102256082A (en) * | 2011-07-25 | 2011-11-23 | 广州视源电子科技有限公司 | Television capable of supporting multiple digital television standards |
| CN109068077A (en) * | 2018-10-11 | 2018-12-21 | 中国人民解放军第七五医院 | Energy-saving control device based on TV signal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2879565Y (en) | Selection circuit for multiple types of TV signal | |
| CN105338446B (en) | Audio track control circuit | |
| CN104506859A (en) | Television core test circuit and system | |
| CN201491136U (en) | Video signal distributor | |
| CN102223499B (en) | Television network switching method, device and television | |
| CN201533344U (en) | Circuit for achieving digital optical fiber and digital coaxial compatibility output of set-top box | |
| CN2836372Y (en) | TV set with multi-channel video signal switching circuit | |
| CN201039332Y (en) | Color system selection circuit and TV set with this selection circuit | |
| CN201518512U (en) | TV radio frequency output circuit and television provided therewith | |
| CN201054650Y (en) | Video output circuit and STB with video output circuit | |
| CN203104675U (en) | Video outputting device | |
| CN201032737Y (en) | Converting switch based input circuit | |
| CN207571881U (en) | The circuit of interrupt signal is extracted in a kind of CVBS signals from reversing | |
| CN2824466Y (en) | Level converting matching circuit and TV set with same | |
| CN2798462Y (en) | Circuit for signal treating between previewing playing and viewing playing chip | |
| CN205335546U (en) | Earphone socket and display device | |
| CN104796628B (en) | Video signal recognition circuit | |
| CN2888795Y (en) | Combination circuit board | |
| CN2483916Y (en) | USB output unit of MPEG-2 encoder | |
| CN2859965Y (en) | Audio commutation circuit | |
| CN204906330U (en) | Filter module based on sensor signal | |
| CN2882153Y (en) | Audio-video output circuit of integral digital TV apparatus | |
| CN202190337U (en) | Audio-video signal processing circuit and television | |
| CN201504293U (en) | Isolator of visitor talkback system host | |
| CN202710645U (en) | Optocoupler-free isolation type switching value input detection module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070314 Termination date: 20100210 |