CN102176744A - Wired signal access circuit of digital television receiving terminal - Google Patents
Wired signal access circuit of digital television receiving terminal Download PDFInfo
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- CN102176744A CN102176744A CN 201110074249 CN201110074249A CN102176744A CN 102176744 A CN102176744 A CN 102176744A CN 201110074249 CN201110074249 CN 201110074249 CN 201110074249 A CN201110074249 A CN 201110074249A CN 102176744 A CN102176744 A CN 102176744A
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Abstract
The invention provides a wired signal access circuit of a digital television receiving terminal. A filtering unit is serially connected with a wired signal access unit which is externally connected with a wired network for transmitting signals in the wired network; when the wired signal access unit is externally connected with the wired network, the filtering unit isolates a wired network ground signal transmitted by the wired network access unit when the wired network ground signal is a low frequency signal, and transmits the wired signal transmitted by the wired signal access unit when the wired signal in the wired network is a high frequency signal so that the television does not access the wired network ground but accesses the commercial power supply ground so as to avoid alternating current (AC) sound. The playing effect of television output sound is guaranteed, and the safety coefficient of the television is also guaranteed.
Description
Technical field
The present invention relates to the receiving terminal for digital television communication technical field, be specifically related to the wire signal place in circuit of receiving terminal for digital television.
Background technology
In recent years, country progressively converts the simulated television whole user to digital cable customers, advances cable television digitalization.Cable television digitalization is by cable TV network digitlization upgrading transmitting digital TV signal, and uses the receiving terminal for digital television receiving digital television signal at user side.After the whole conversion of cable television digitalization, browsing information also can be opened interactive TV but television image is more clear, sound accompaniment is true to nature, channel is multiplied.Television set really becomes the family multi-media information terminal, and then becomes the important symbol of national information, social informatization, household's IT application.
Along with the digitized transformation of Digital Television, receiving terminal for digital television more and more enters into huge numbers of families.But present television set generally adopts three core power lines, and receiving terminal for digital television generally adopts two core power lines.When the user adopts receiving terminal for digital television to watch Digital Television, receiving terminal for digital television has access to spider lines by its wire signal place in circuit, the wire signal place in circuit not only receives the wire signal of cable network, also receive the cable network earth signal, the cable network earth signal is transferred to television set, make television set be in to insert simultaneously the situation on mains supply ground and cable network ground, because cable network ground is different with mains supply ground, can there be potential difference between mains supply ground and the cable network ground, make that sound accompaniment produced very large hum when the user televiewed, have a strong impact on user experience.
Can produce the technical problem of hum when solving above-mentioned televiewing, prior art one, design a kind of receiving terminal for digital television, newly-designed receiving terminal for digital television is replaced by three core power lines by two core power lines, thereby makes the TV function insert same ground wire.But, adopting this kind technical scheme, receiving terminal for digital television need be from new design, and present already used receiving terminal for digital television will be eliminated, and causes waste; In addition, receiving terminal for digital television is designed to can be relatively heavier behind the three core power lines, dismounting, moves inconvenience, and prior art two is cut off the earth connection in the three core power lines of television set: one, destroy the grounded metal body of television set three plugs, and it can not be inserted; Its two, insert not with the wiring board of earth connection, reach the purpose of cutting off television set ground connection.But, adopt this kind scheme can destroy the effective grounding of TV, cause the coefficient of safety of TV to reduce.
Summary of the invention
The embodiment of the invention provides the wire signal place in circuit of receiving terminal for digital television.
A kind of wire signal place in circuit of receiving terminal for digital television comprises:
Filter unit, the wire signal that is connected in series with described filter unit enters the unit;
Described wire signal enters the unit and is circumscribed with spider lines, the signal in the transmission cable network; When wired signal input unit is circumscribed with spider lines, described filter unit is that low frequency signal is isolated the cable network earth signal that described wire signal enters the unit transmission according to cable network earth signal in the cable network, is that high-frequency signal transmits the wire signal that described wire signal enters the unit transmission according to wire signal in the cable network.
The embodiment of the invention adopts in the wire signal place in circuit of receiving terminal for digital television, with filter unit wired signal input unit that is connected in series, when wired signal input unit is circumscribed with spider lines, filter unit is that low frequency signal is isolated the cable network earth signal that wire signal enters the unit transmission according to cable network earth signal in the cable network, according to wire signal in the cable network is that high-frequency signal transmits the wire signal that wire signal enters the unit transmission, make television set can not have access to spider lines ground, only can be in the situation that inserts mains supply ground, avoided hum, both guarantee the result of broadcast of television set output sound, guaranteed the coefficient of safety of television set again.
Description of drawings
Fig. 1 is the schematic diagram of the wire signal place in circuit of receiving terminal for digital television in the embodiment of the invention;
Fig. 2 is the receiving terminal for digital television that has access to spider lines in the embodiment of the invention and television set ground state schematic diagram after television set is connected.
Embodiment
The embodiment of the invention provides a kind of wire signal place in circuit of receiving terminal for digital television, below is elaborated.
With reference to shown in Figure 1, in embodiments of the present invention, the wire signal place in circuit comprises:
Wire signal enters unit 102 and is circumscribed with spider lines, the signal in the transmission cable network; When wired signal input unit 102 is circumscribed with spider lines, filter unit 101 is that low frequency signal is isolated the cable network earth signal that wire signal enters unit 102 transmission according to cable network earth signal in the cable network, is that high-frequency signal transmits the wire signal that wire signal enters unit 102 transmission according to wire signal in the cable network.
Optionally, when wired signal input unit 102 is connected with spider lines by coaxial cable, wire signal enters unit 102 and comprises and be used for screen that is connected with the shielding conductor of coaxial cable and the transport layer that is used for linking to each other with the holding wire of coaxial cable, transport layer is the inner wire link with respect to screen, screen is positioned at the outside of transport layer, preferably, screen directly is not communicated with the shell of receiving terminal for digital television, like this, even cable network generation circuit problem and high-tension current is sent to the screen that wire signal enters unit 102, can not make yet and injure the outer casing electrification of receiving terminal for digital television thereby make the user avoid electricity.
Wire signal enters the screen of unit 102 and the transport layer filter unit 101 that can be connected in series simultaneously, certainly, also can have a plurality of filter units 101 to be connected in series in screen and transport layer that wire signal enters unit 102 respectively.
Couple together in order to allow the user can be easily coaxial cable and wire signal be entered unit 102, the shell of receiving terminal for digital television is passed in the hole that wire signal enters the shell that unit 102 can be by receiving terminal for digital television, when wired signal input unit 102 passes the shell of receiving terminal for digital television by the hole of the shell of receiving terminal for digital television, preferably, wire signal enters between the hole wall in hole of shell of the screen of unit 102 and receiving terminal for digital television can nonconducting outer spacer, thereby allows screen directly not be communicated with the shell of receiving terminal for digital television.
Optional again, wire signal enters unit 102 and is made up of one section coaxial cable and docking apparatus, wire signal enters unit 102 and passes the receiving terminal for digital television shell by the hole of the shell of receiving terminal for digital television, preferably, this section coaxial cable can be positioned at the enclosure of receiving terminal for digital television, the shielding conductor of this section coaxial cable and holding wire can be connected in series with filter unit 101 simultaneously, perhaps the shielding conductor of this section coaxial cable and holding wire can be connected in series with a plurality of filter units 101 respectively, docking apparatus is positioned at the housing exterior of receiving terminal for digital television, concrete, docking apparatus can adopt the F type docking apparatus of standard, is convenient to the user and wire signal is entered unit 102 is connected with cable network.
Further, because electric capacity has the effect of the logical high frequency of resistance low frequency, and the cable network earth signal in the cable network is exactly a low frequency signal, wire signal in the cable network is a high-frequency signal, filter unit 101 can be electric capacity, realize isolating the cable network earth signal that wire signal enters unit 102 transmission by electric capacity, transmit the wire signal that wire signal enters unit 102 transmission.Filter unit 101 can be made up of one or more electric capacity, and electric capacity can be selected ordinary porcelain chip capacitor, high pressure ceramic disc capacitor and SMD electric capacity.
Jumbo electric capacity is because there is bigger inductance in the restriction of manufacturing process, and is big more by the high more impedance on the contrary of signal frequency of large bulk capacitance, so filter the electric capacity of high-frequency signal with low capacity usually; The jumbo electric capacity of filter low frequency signal.In embodiments of the present invention, the capacity of electric capacity can obtain by emulation according to the frequency of cable network earth signal.
Further; if filter unit 101 is high pressure ceramic disc capacitor (for example common high pressure ceramic disc capacitor and SMD high-voltage capacitances); because the characteristic of high pressure ceramic disc capacitor; can be when cable network generation circuit problem (for example ground connection is bad) causes electric current to seal in; effectively block the electric current of cable network; make the electric current of cable network can not flow into other internal parts of the receiving terminal for digital television that is connected with the wire signal place in circuit (for example tuner of receiving terminal for digital television), reach the protection user security and guarantee the normal purpose of using of receiving terminal for digital television.
Need to prove, though the embodiment of the invention is to be applied to receiving terminal for digital television, but those skilled in the art can conspicuous religious doctrine according to the embodiment of the invention, the embodiment of the invention is applied to carry out the equipment that low frequency signal is isolated, further, those skilled in the art can be conspicuous, at the active access device of broadcasting and TV (receiving terminal for digital television tuner for example, cable modem (Cable Modem), ethernet coaxial cable transmission terminal (EOC, Ethernet over Coax) device etc.) in the signal place in circuit in, increase the high pressure ceramic disc capacitor, thereby when not influencing the signal reception, when cable network generation circuit problem (for example ground connection is bad) causes electric current to seal in, the electric current of blocking-up cable network enters the miscellaneous part of the active access device of broadcasting and TV, increased the safety in utilization of equipment, the normal purpose of using of assurance equipment.
The embodiment of the invention adopts in the wire signal place in circuit of receiving terminal for digital television, wire signal enters units in series and connects filter unit, when wired signal input unit has access to spider lines, filter unit is that low frequency signal is isolated the cable network earth signal that wire signal enters the unit transmission according to cable network earth signal in the cable network, according to wire signal in the cable network is that high-frequency signal transmits the wire signal that wire signal enters the unit transmission, make television set can not have access to spider lines ground, only can be in the situation that inserts mains supply ground, avoided hum, both guarantee the result of broadcast of television set output sound, guaranteed the coefficient of safety of television set again.
See also Fig. 2, Fig. 2 be the receiving terminal for digital television that has access to spider lines in the embodiment of the invention with after television set is connected, the ground state schematic diagram of television set, specific as follows:
Three core power lines of television set are connected with electricity network, the wire signal place in circuit of receiving terminal for digital television is connected with cable network by coaxial cable, receiving terminal for digital television and television set are by connecting line (aberration line for example, look tone frequency channel wire, HDMI cable etc.) be connected, filter unit can be that low frequency signal is isolated the cable network earth signal that wire signal enters the unit transmission according to cable network earth signal in the cable network, according to wire signal in the cable network is that high-frequency signal transmits the wire signal that wire signal enters the unit transmission, thereby on the basis of the normal use that guarantees wire signal, allow television set can not have access to spider lines ground, only insert mains supply ground, avoided hum.
More than the wire signal place in circuit of the receiving terminal for digital television that the embodiment of the invention provided is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the wire signal place in circuit of a receiving terminal for digital television is characterized in that, comprising:
Filter unit, the wire signal that is connected in series with described filter unit enters the unit;
Described wire signal enters the unit and is circumscribed with spider lines, the signal in the transmission cable network; When wired signal input unit is circumscribed with spider lines, described filter unit is that low frequency signal is isolated the cable network earth signal that described wire signal enters the unit transmission according to cable network earth signal in the cable network, is that high-frequency signal transmits the wire signal that described wire signal enters the unit transmission according to wire signal in the cable network.
2. circuit according to claim 1 is characterized in that,
Described wire signal enters the unit and is connected with spider lines by external coaxial cable, described wire signal enters the unit and comprises: be used for the screen and the transport layer that is used for the holding wire of external coaxial cable of the shielding conductor of external coaxial cable, described screen is positioned at the outside of described transport layer;
Described filter unit is connected in series in screen and the transport layer that described wire signal enters the unit simultaneously.
3. circuit according to claim 1 is characterized in that,
Described wire signal enters the unit and is connected with spider lines by external coaxial cable, described wire signal enters the unit and comprises: be used for the screen and the transport layer that is used for the holding wire of external coaxial cable of the shielding conductor of external coaxial cable, described screen is positioned at the outside of described transport layer;
A plurality of described filter units are connected in series in screen and the transport layer that described wire signal enters the unit respectively.
4. according to claim 2 or 3 described circuit, it is characterized in that,
Pass the shell of receiving terminal for digital television when described wire signal enters the unit by the hole of the shell of receiving terminal for digital television, described wire signal enters between the hole wall in the described screen of unit and described hole nonconducting outer spacer.
5. circuit according to claim 4 is characterized in that, described filter unit is an electric capacity.
6. circuit according to claim 5 is characterized in that, described electric capacity is ceramic disc capacitor.
7. circuit according to claim 6 is characterized in that, described electric capacity is the high pressure ceramic disc capacitor.
8. according to the arbitrary described circuit of claim 5-7, it is characterized in that described filter unit is made up of one or more electric capacity.
9. circuit according to claim 8 is characterized in that,
The capacity of described electric capacity is determined according to the frequency of cable network earth signal.
10. circuit according to claim 1 is characterized in that,
Described wire signal enters the unit and is made up of one section coaxial cable and docking apparatus, described wire signal enters the unit passes receiving terminal for digital television by the hole of the shell of receiving terminal for digital television shell, the shielding conductor of described one section coaxial cable and holding wire and described filter unit are connected in series, and described docking apparatus is positioned at the housing exterior of receiving terminal for digital television.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110074249 CN102176744A (en) | 2011-03-25 | 2011-03-25 | Wired signal access circuit of digital television receiving terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110074249 CN102176744A (en) | 2011-03-25 | 2011-03-25 | Wired signal access circuit of digital television receiving terminal |
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| CN102176744A true CN102176744A (en) | 2011-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110074249 Pending CN102176744A (en) | 2011-03-25 | 2011-03-25 | Wired signal access circuit of digital television receiving terminal |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106210595A (en) * | 2012-11-22 | 2016-12-07 | 江苏华兴电子有限公司 | For guaranteeing the antenna isolator of high-frequency signal transmission quality |
| CN115128858A (en) * | 2022-06-27 | 2022-09-30 | 中车青岛四方机车车辆股份有限公司 | Vehicle window with partitioned dimming function, dimming method, electronic device and storage medium |
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| CN201048441Y (en) * | 2007-03-17 | 2008-04-16 | 巢雨 | Safety type high interference immunity wired network television signal connecting device |
| CN101198001A (en) * | 2007-02-08 | 2008-06-11 | 莫胜林 | Anti-interference television system bidirectional user port capable of preventing creepage |
| CN201298898Y (en) * | 2008-09-26 | 2009-08-26 | 武汉电信器件有限公司 | Wire television signal input end matching network circuit |
-
2011
- 2011-03-25 CN CN 201110074249 patent/CN102176744A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101198001A (en) * | 2007-02-08 | 2008-06-11 | 莫胜林 | Anti-interference television system bidirectional user port capable of preventing creepage |
| CN201048441Y (en) * | 2007-03-17 | 2008-04-16 | 巢雨 | Safety type high interference immunity wired network television signal connecting device |
| CN201298898Y (en) * | 2008-09-26 | 2009-08-26 | 武汉电信器件有限公司 | Wire television signal input end matching network circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106210595A (en) * | 2012-11-22 | 2016-12-07 | 江苏华兴电子有限公司 | For guaranteeing the antenna isolator of high-frequency signal transmission quality |
| CN106210595B (en) * | 2012-11-22 | 2018-12-07 | 江苏华兴电子有限公司 | For ensuring the antenna isolator of high-frequency signal transmission quality |
| CN115128858A (en) * | 2022-06-27 | 2022-09-30 | 中车青岛四方机车车辆股份有限公司 | Vehicle window with partitioned dimming function, dimming method, electronic device and storage medium |
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Application publication date: 20110907 |