CN201142721Y - Isolation device for noise signal of cable television and digital television receiver - Google Patents
Isolation device for noise signal of cable television and digital television receiver Download PDFInfo
- Publication number
- CN201142721Y CN201142721Y CNU200720196591XU CN200720196591U CN201142721Y CN 201142721 Y CN201142721 Y CN 201142721Y CN U200720196591X U CNU200720196591X U CN U200720196591XU CN 200720196591 U CN200720196591 U CN 200720196591U CN 201142721 Y CN201142721 Y CN 201142721Y
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- filtering element
- television receiver
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Abstract
The utility model discloses a CATV noise signal isolation device and a digital TV receiver provided with the device, wherein the isolation device comprises a first noise filtering element, which is preferably a high-pressure resistant capacitor, used for filtering noise signals on the transmission path in which the CATV transmits the radio frequency, and connected in series to radio frequency signal transmission wire of CATV signals. The CATV noise signal isolation device solves the humming noise brought by noise signals generated in the CATV signal transmission process, leads to a small attenuation of the CATV signals, and ensures the transmission quality and the transmission signal strength of the CATV signals, with the advantages of simple structure and low cost.
Description
Technical field
The utility model relates to noise reduction techniques, especially relate to and a kind ofly be used for that the cable TV signal transmission course is produced noise signal and isolate, avoid its noise isolator that enters digital television receiver, and a kind of digital television receiver that disposes this noise isolator.
Background technology
At present, domestic cable TV network complex structure is various, and network condition is relatively poor relatively.In the network of some centrally connected power supplies, charger with the quantity of amplifier certain limit is arranged, when the gross power of amplifier and line loss power sum during greater than the power of charger, charger can excess load fortune move, cause the downstream electrical drops, when this voltage was lower than the needed voltage of amplifier, the power module of voltage regulation of amplifier did not have the effect of voltage stabilizing and the ripple coefficient of power supply is increased, and causes the grunt interference phenomenon; In addition, the power module of voltage regulation of amplifier produces fault also can make the ripple coefficient of power supply increase, and causes grunt to disturb.This grunt is disturbed when digital television receiver connects some high-end liquid crystal TV set, black streaking or informal voucher line can appear on the screen of liquid crystal TV set, even the asynchronous and sound accompaniment of audio frequency and video also can occur AC hum is arranged, seriously influenced user's view reception effect.
The utility model content
For solving the problem that prior art exists, the utility model proposes and a kind ofly be used for that the cable TV signal transmission course is produced noise signal and isolate, avoid it to enter the noise isolator of digital television receiver, and a kind of digital television receiver that disposes this noise isolator, produce the technical problem that noise signal brings grunt to disturb in the CATV transmission process to solve.
For reaching above-mentioned purpose, the utility model discloses a kind of spacer assembly of cable TV noise signal, comprising: be serially connected on the radio frequency signal transmission line of cable TV signal, be used for the first noise filtering element of the noise signal that filtering cable TV transmission produces on the defeated path of signal frequently.
More excellent, the spacer assembly of cable TV noise signal of the present utility model also comprises: screening can, the described first noise filtering element is arranged at screening can inside.
More excellent, the spacer assembly of cable TV noise signal of the present utility model also comprises: be arranged at the second noise filtering element on the earth signal transmission line of cable TV signal.
More excellent, the described second noise filtering element is high voltage bearing capacitor.
More excellent, the described first noise filtering element is high voltage bearing capacitor.
In addition, the utility model discloses a kind of digital television receiver, comprising: be used to receive cable TV signal and make demodulation process, the tuner of output transport stream; Be used for transport stream is made decoding processing the decoder of outputting digital audio and vision signal; Be used for respectively audio output interface and video output interface with digital audio and vision signal output; And be connected with described decoder with described tuner, be used to control described decoder is made decoding processing to the transport stream of described tuner output control unit; Be connected cable TV signal and import on the transmission line of described tuner, be used for device that the noise signal of the cable TV signal that imports described tuner into is isolated, this device comprises:
Be serially connected on the radio frequency signal transmission line of cable TV signal, be used for the first noise filtering element of the noise signal that filtering cable TV transmission produces on the defeated path of signal frequently.
More excellent, digital television receiver of the present utility model also comprises: screening can, the described first noise filtering element is arranged at screening can inside.
More excellent, digital television receiver of the present utility model also comprises: be serially connected in the second noise filtering element on the earth signal transmission line of cable TV signal.
More excellent, the described second noise filtering element is high voltage bearing capacitor.
More excellent, the described first noise filtering element is high voltage bearing capacitor.
Compared with prior art, the utlity model has following beneficial effect:
1, the utility model comes the filtering noise signal by all be connected in series a high voltage bearing capacitor on the transmission line of cable TV radiofrequency signal even earth signal transmission line, with this noise signal filtering that will enter the cable TV signal of digital television receiver, solved and produced the technical problem that noise signal brings grunt to disturb in the cable TV signal transmission course;
2, spacer assembly of the present utility model is very little to the decay of cable TV signal, even less than 1db, has guaranteed the transmission quality and the transmission signal strength of cable TV signal; In addition, spacer assembly of the present utility model can also cooperate by digital television receiver medium-high frequency head, effectively resolved impedance spectroscopy matching problem and shielding problem; And spacer assembly of the present utility model has simple in structure, lower-cost advantage.
Description of drawings
Fig. 1 is the structural representation of a preferred embodiment of the utility model digital television receiver.
Fig. 2 is the structural representation of another preferred embodiment of the utility model spacer assembly.
Embodiment
Because what transmit on the CATV transmission main line is the cable TV radiofrequency signal, and cause that the grunt interfering noise signals is the power frequency interference signals of frequency about 50HZ, therefore, can come the filtering noise signal by on the transmission line of cable TV radiofrequency signal even earth signal transmission line, all being connected in series a high voltage bearing capacitor, will enter the noise signal filtering of the cable TV signal of digital television receiver with this.
Please refer to shown in Figure 1.Present embodiment is a kind of digital television receiver 100 that is used to receive cable TV signal, comprising: be used to receive cable TV signal and make demodulation process, the tuner 110 of output transport stream; Be used for transport stream is made decoding processing the decoder 130 of outputting digital audio and vision signal; Be used for respectively audio output interface 141 and video output interface 142 with digital audio and vision signal output; And the control unit 120 that is connected with described decoder 130 with described tuner 110, this control unit 120 is used to control the transport stream of 130 pairs of described tuners 110 outputs of described decoder and makes decoding processing, and by voice data and video data behind described decoder 130 output decoders; And the spacer assembly 150 that can built-in, also can be placed on digital television receiver 100, be connected cable TV signal and import on the transmission line of described tuner 110, be used for the noise signal of the cable TV signal that imports described tuner 110 into is carried out isolation processing.
Among this embodiment, described spacer assembly 150 comprises: screening can 151; Be serially connected on the radio frequency signal transmission line 152 of the cable TV signal that is arranged at screening can 151 inside, be used for the first noise filtering element of the noise signal that filtering cable TV transmission frequently produces on the defeated path of signal, this first noise filtering element is other high voltage bearing capacitor C1 of pico farad (pF) level; And being arranged at the second noise filtering element on the earth signal transmission line 153 of the inner and cable TV signal that is serially connected in of screening can 151, this second noise filtering element also is other high voltage bearing capacitor C2 of pico farad level.
Find through test, the frequency of the noise signal that produces in the cable TV signal transmission course is about 50HZ, present embodiment will carry out filtering by capacitor C1 and C2 respectively regardless of being by the radio frequency signal transmission line or the noise signal of earth signal transmission line; Because capacitor C1 and C2 are other high voltage bearing capacitors of pico farad level, can guarantee the normal transmission into the cable TV radiofrequency signal of high frequency fully.Like this, noise signal is all can not be transferred to digital television receiver by radio frequency signal transmission line or earth signal transmission line, plays the effect of noise isolation with this; And find that through test this scheme is very little to the decay of cable TV signal, even less than 1db, does not influence the laser propagation effect of cable TV signal.
Simultaneously, please refer to shown in Figure 2.This embodiment compares with embodiment illustrated in fig. 1, only has been connected in series capacitor C1 on the radio frequency signal transmission line 152 of cable TV signal, can realize essentially identical noise isolation effect embodiment illustrated in fig. 1, at this enumeration no longer.
To sum up, the utlity model has following useful technique effect:
1, the utility model by on the transmission line of radio-frequency signal of wired TV even earth signal transmission line all Be connected in series a high voltage bearing capacitor and come the filtering noise signal, will enter having of digital television receiver with this The noise signal filtering of line TV signal has solved in the Cable TV Signal Transmission process and has produced noise signal The technical problem of bringing grunt to disturb;
2, spacer assembly of the present utility model is very little to the decay of cable TV signal, even less than 1db, Transmission quality and the transmission signal strength of cable TV signal have been guaranteed; In addition, isolation of the present utility model Device can also cooperate by the digital television receiver making high frequency head, effectively resolved impedance spectroscopy matching problem and shielding Problem; And spacer assembly of the present utility model has simple in structure, lower-cost advantage.
Claims (10)
1, a kind of spacer assembly of cable TV noise signal is characterized in that, comprising: be serially connected on the radio frequency signal transmission line of cable TV signal, be used for the first noise filtering element of the noise signal that filtering cable TV transmission produces on the defeated path of signal frequently.
2, the spacer assembly of cable TV noise signal according to claim 1 is characterized in that, also comprises: screening can, the described first noise filtering element is arranged at screening can inside.
3, the spacer assembly of cable TV noise signal according to claim 1 is characterized in that, also comprises: be arranged at the second noise filtering element on the earth signal transmission line of cable TV signal.
4, the spacer assembly of cable TV noise signal according to claim 3 is characterized in that, the described second noise filtering element is high voltage bearing capacitor.
According to the spacer assembly of any one described cable TV noise signal of claim 1 to 4, it is characterized in that 5, the described first noise filtering element is high voltage bearing capacitor.
6, a kind of digital television receiver comprises: be used to receive cable TV signal and make demodulation process, the tuner of output transport stream; Be used for transport stream is made decoding processing the decoder of outputting digital audio and vision signal; Be used for respectively audio output interface and video output interface with digital audio and vision signal output; And be connected with described decoder with described tuner, be used to control described decoder is made decoding processing to the transport stream of described tuner output control unit; It is characterized in that, also comprise:
Be connected cable TV signal and import on the transmission line of described tuner, be used for device that the noise signal of the cable TV signal that imports described tuner into is isolated, this device comprises:
Be serially connected on the radio frequency signal transmission line of cable TV signal, be used for the first noise filtering element of the noise signal that filtering cable TV transmission produces on the defeated path of signal frequently.
7, digital television receiver according to claim 6 is characterized in that, also comprises: screening can, the described first noise filtering element is arranged at screening can inside.
8, digital television receiver according to claim 6 is characterized in that, also comprises: be serially connected in the second noise filtering element on the earth signal transmission line of cable TV signal.
9, digital television receiver according to claim 8 is characterized in that, the described second noise filtering element is high voltage bearing capacitor.
According to any one described digital television receiver of claim 6 to 9, it is characterized in that 10, the described first noise filtering element is high voltage bearing capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720196591XU CN201142721Y (en) | 2007-12-29 | 2007-12-29 | Isolation device for noise signal of cable television and digital television receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720196591XU CN201142721Y (en) | 2007-12-29 | 2007-12-29 | Isolation device for noise signal of cable television and digital television receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201142721Y true CN201142721Y (en) | 2008-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720196591XU Expired - Fee Related CN201142721Y (en) | 2007-12-29 | 2007-12-29 | Isolation device for noise signal of cable television and digital television receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201142721Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103517007A (en) * | 2012-06-29 | 2014-01-15 | Lg伊诺特有限公司 | Broadcasting receiving device |
| CN103716563A (en) * | 2012-10-04 | 2014-04-09 | Lg伊诺特有限公司 | Broadcasting receiving device |
| CN110913253A (en) * | 2018-09-14 | 2020-03-24 | 金宝电子工业股份有限公司 | Connector module and set-top box |
| WO2022147909A1 (en) * | 2021-01-11 | 2022-07-14 | 谢子进 | Television with electronic sensor |
-
2007
- 2007-12-29 CN CNU200720196591XU patent/CN201142721Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103517007A (en) * | 2012-06-29 | 2014-01-15 | Lg伊诺特有限公司 | Broadcasting receiving device |
| CN103716563A (en) * | 2012-10-04 | 2014-04-09 | Lg伊诺特有限公司 | Broadcasting receiving device |
| CN110913253A (en) * | 2018-09-14 | 2020-03-24 | 金宝电子工业股份有限公司 | Connector module and set-top box |
| CN110913253B (en) * | 2018-09-14 | 2021-10-08 | 金宝电子工业股份有限公司 | Connector module and set-top box |
| WO2022147909A1 (en) * | 2021-01-11 | 2022-07-14 | 谢子进 | Television with electronic sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081029 Termination date: 20141229 |
|
| EXPY | Termination of patent right or utility model |