CN205105346U - STB and digital all -in -one television system - Google Patents
STB and digital all -in -one television system Download PDFInfo
- Publication number
- CN205105346U CN205105346U CN201520719208.9U CN201520719208U CN205105346U CN 205105346 U CN205105346 U CN 205105346U CN 201520719208 U CN201520719208 U CN 201520719208U CN 205105346 U CN205105346 U CN 205105346U
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- trap circuit
- filter capacitor
- inductance
- top box
- transmission
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Abstract
The utility model discloses a STB, the STB includes blender, modem and RF trapper, the blender is held, is used for the second transmission end of the down signal of transmission and hold with the public transmission of cable television internet access including the first transmission that is used for the transmission to go upward the signal, first transmission end with modem connects, second transmission end with the RF trapper is connected. The utility model also discloses a digital all -in -one television system. The utility model provides high video result of broadcast.
Description
Technical field
The utility model relates to digital television techniques field, particularly relates to Set Top Box and digital intergrated unit television system.
Background technology
Digital Television mainly contains broadcast type Digital Television and interactive digital TV two kinds.Broadcast type Digital Television is traditional cable television network (CATV), the information television system that broadcast type Digital Television is is prevailing transmission medium transmission TV programme with optical cable, cable, take television channel as the Digital Television of concept, be transmitted as basis with the unidirectional program of TV station, user can only select the program watching certain channel in whole viewing process, but cannot select for the particular content, broadcast time etc. of channel.Along with developing rapidly of optical fiber transmission technique, digital communication technology and computer technology etc., CATV has developed into Comprehensive Business Broadband Networks network, not only transmits broadcast TV program, and can provide the business such as multimedia data broadcast and data communication.Owing to adopting internet ip procotol, user can initiatively send request, and completes programme content, the selection of Pgmtime and reviewing programme content.This interactive digital TV changes user in the past can only the situation of passive reception, and user can the initiatively interested content of program request oneself, thus really meets the individual demand of each consumer entertainment life.Interactive digital TV adopts a kind of asymmetric transmitted in both directions network, and between service provider and terminal use, establish two channels, one is broadcast channel, i.e. downstream signal; One is interactive channel, i.e. upward signal.Transmit uplink and downlink signal respectively by different carrier frequencies according to frequency division transmitted in both directions mode, specify according to GY/T106-1999, upward signal is transmitted with 5 ~ 65MHz frequency band, 65 ~ 87MHz is transition frequency band, 110 ~ 1000MHz frequency band transmits downstream signal, for transportation simulator TV, Digital Television and digital service.Television set and Set Top Box transmit schematic diagram as shown in Figure 1, and the upward signal of transmission interactive information, by modulator-demodulator 20, is received blender 10 and received cable TV network again; The downstream signal of TV transmission broadcast singal receives cable TV network by blender.Because upward signal and downstream signal all receive cable TV network again by blender, when upward signal carries out transfer of data, downstream signal will be entered by blender crosstalk, form interference signal, thus have influence on normal television broadcasting signal, cause image when the interactive operation such as to review to occur the interference phenomenons such as mosaic, affect video display effect.
Utility model content
Main purpose of the present utility model is to provide a kind of Set Top Box and digital intergrated unit television system, is intended to improve video display effect.
To achieve these goals, the utility model provides a kind of Set Top Box, and described Set Top Box comprises blender, modulator-demodulator and RF trapper; Described blender comprises the first transmission ends for transmitting upward signal, for the second transmission ends of transmission of downlink signal and the common transmission end that is connected with cable TV network, described first transmission ends is connected with described modulator-demodulator, and described second transmission ends is connected with described RF trapper.
Preferably, described RF trapper comprises input, output, is located at described input and is connected in series some filter capacitors between output successively and transfers to the trap circuit of described output for limiting described upward signal from described input; Described input is connected with described second transmission ends, and described output is used for being connected with the tuner of television set.
Preferably, filter capacitor described in each connects a trap circuit away from the side correspondence of described input, and the frequency filtering of each trap circuit is inconsistent.
Preferably, described trap circuit is inductance or described trap circuit is the inductance of series connection mutually and the resonant circuit of electric capacity formation.
Preferably, described filter capacitor comprises the first filter capacitor, the second filter capacitor, the 3rd filter capacitor and the 4th filter capacitor that are connected in series successively from described input to output; Described trap circuit comprises the first trap circuit, the second trap circuit, the 3rd trap circuit and the 4th trap circuit; Described first trap circuit comprises the first inductance, and one end of described first inductance is connected to the public connecting end of the first filter capacitor and the second filter capacitor, other end ground connection; Described second trap circuit comprises the second inductance and the first resonant capacitance, and one end of described second inductance is connected to the public connecting end of described second filter capacitor and the 3rd filter capacitor, and the other end is by described first resonant capacitance ground connection; Described 3rd trap circuit comprises the 3rd inductance and the second resonant capacitance, and one end of described 3rd inductance is connected to the public connecting end of described 3rd filter capacitor and the 4th filter capacitor, and the other end is by the second resonant capacitance ground connection; Described 4th trap circuit comprises the 4th inductance and the 3rd resonant capacitance, and one end of described 4th inductance is connected with described output, and the other end is by the 3rd resonant capacitance ground connection.
In addition, for achieving the above object, the utility model also provides a kind of digital intergrated unit television system, and described digital intergrated unit television system comprises television set and Set Top Box, and described Set Top Box comprises blender, modulator-demodulator and RF trapper; Described blender comprises the first transmission ends for transmitting upward signal, for the second transmission ends of transmission of downlink signal and the common transmission end that is connected with cable TV network, described first transmission ends is connected with described modulator-demodulator, and described second transmission ends is connected with described RF trapper; The tuner of described television set is connected with blender by RF trapper, and the network interface of described television set is connected with blender by modulator-demodulator.
The utility model embodiment by connecting a RF trapper in the second transmission ends of blender, and is connected with the tuner of television set by this RF trapper.Thus in the transmitting procedure of downstream signal effective filtering upward signal, prevent downstream signal produce interference, improve video display effect.
Accompanying drawing explanation
Fig. 1 is the Signal transmissions schematic diagram of television set and Set Top Box in conventional digital integrated machine television system;
Fig. 2 is the Signal transmissions schematic diagram of television set and Set Top Box in digital intergrated unit television system one embodiment of the present invention;
Fig. 3 is the electrical block diagram of RF trapper in digital intergrated unit television system one embodiment of the present invention.
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Drawing reference numeral illustrates:
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The utility model provides a kind of Set Top Box, and with reference to Fig. 2, in one embodiment, this Set Top Box comprises blender 10, modulator-demodulator 20 and RF trapper 30; Described blender 10 comprises the first transmission ends for transmitting upward signal, for the second transmission ends of transmission of downlink signal and the common transmission end that is connected with cable TV network, described first transmission ends is connected with described modulator-demodulator 20, and described second transmission ends is connected with described RF trapper 30.
The Set Top Box that the utility model provides is mainly used in digital intergrated unit television system, for carrying out the forwarding of signal.Particularly, in Set Top Box, above-mentioned first transmission ends is connected with the network interface of television set by modulator-demodulator 20, to transmit upward signal; Above-mentioned second transmission ends is connected with the tuner of television set by RF trapper 30.Particularly, above-mentioned RF trapper 30, for limiting described upward signal by blender 10, produces the interference to downstream signal.
During work, in the process of carrying out downstream signal transmission, when upward signal carries out transfer of data, will enter downstream signal by blender crosstalk, upward signal, after RF trapper 30, is carried out filtering by downstream signal.Thus can effectively prevent upward signal to the interference of downstream signal.
The utility model embodiment by connecting a RF trapper 30 in the second transmission ends of blender 10, and is connected with the tuner of television set by this RF trapper 30.Thus in the transmitting procedure of downstream signal effective filtering upward signal, prevent downstream signal produce interference, improve video display effect.
Particularly, as shown in Figure 3, above-mentioned RF trapper 30 comprises input Vin, output end vo ut, is located at described input Vin and is connected in series some filter capacitors between output end vo ut successively and transfers to the trap circuit of described output for limiting described upward signal from described input; Described input Vin is connected with described second transmission ends, and described output end vo ut is used for being connected with the tuner of television set.
Be understandable that, the set-up mode of above-mentioned trap circuit and frequency filtering can be arranged according to actual needs, as long as can reach the frequency of the low frequency upward signal of filtering 0 ~ 100MHz.In the present embodiment, preferably, filter capacitor described in each connects a trap circuit away from the side correspondence of described input Vin, and the frequency filtering of each trap circuit is inconsistent.
Further, the structure of above-mentioned trap circuit can be arranged according to actual needs, and in the present embodiment, above-mentioned trap circuit can be the inductance of series connection mutually and the series resonant circuit of electric capacity formation for inductance or described trap circuit.
Be described with a concrete circuit below.As shown in Figure 3, above-mentioned filter capacitor comprises the first filter capacitor C1, the second filter capacitor C2, the 3rd filter capacitor C3 and the 4th filter capacitor C4 that are connected in series successively from described input to output; Described trap circuit comprises the first trap circuit 31, second trap circuit 32, the 3rd trap circuit 33 and the 4th trap circuit 34; Described first trap circuit 31 comprises the first inductance L 1, and one end of described first inductance L 1 is connected to the public connecting end of the first filter capacitor C1 and the second filter capacitor C2, other end ground connection; Described second trap circuit 32 comprises the second inductance L 2 and the first resonant capacitance C11, and one end of described second inductance L 2 is connected to the public connecting end of described second filter capacitor C2 and the 3rd filter capacitor C3, and the other end is by described first resonant capacitance C11 ground connection; Described 3rd trap circuit 33 comprises the 3rd inductance L 3 and the second resonant capacitance C12, and one end of described 3rd inductance L 3 is connected to the public connecting end of described 3rd filter capacitor C3 and the 4th filter capacitor C4, and the other end is by the second resonant capacitance C12 ground connection; Described 4th trap circuit 34 comprises the 4th inductance L 4 and the 3rd resonant capacitance C13, and one end of described 4th inductance L 4 is connected with described output Vin, and the other end is by the 3rd resonant capacitance C13 ground connection.
In the present embodiment, the resonance frequency of above-mentioned first trap circuit 31, second trap circuit 32, the 3rd trap circuit 33 and the 4th trap circuit 34 between 5 ~ 100MHz, and increases successively.Particularly, the parameter that can arrange inductance and resonant capacitance in the first trap circuit 31, second trap circuit 32, the 3rd trap circuit 33 and the 4th trap circuit 34 carries out filtering control.Such as, above-mentioned first inductance L 1 can be set to 100nH, and above-mentioned second inductance L 2 can be set to 85nH, and above-mentioned 3rd inductance L 3 can be set to 100nH, and above-mentioned 4th inductance L 4 can be set to 120nH; Above-mentioned first resonant capacitance can be set to 82pF, and above-mentioned second resonant capacitance can be set to 68pF, and above-mentioned 3rd resonant capacitance can be set to 100pF.
During work, after signal enters the input Vin of RF trapper 30, electric capacity and Ge Lu trap circuit export from output end vo ut more after filtering.When the signal that frequency band is 5-100MHZ entered multichannel trap circuit, according to the principle that series resonant impedance is minimum, frequency band is that the transfer impedance of 5-100MHZ signal is minimum, signal strength signal intensity is significantly decayed, and frequency band to be the signal of more than 100MHZ very large through trap circuit transfer impedance, on signal strength signal intensity then without affecting.
The utility model also provides a kind of digital intergrated unit television system, this digital intergrated unit television system comprise television set and and Set Top Box, the structure of this Set Top Box can refer to above-described embodiment, does not repeat them here; The tuner of described television set is connected with blender by RF trapper, and the network interface of described television set is connected with blender by modulator-demodulator.Naturally, the digital intergrated unit television system due to the present embodiment have employed the technical scheme of above-mentioned Set Top Box, and therefore this digital intergrated unit television system has all beneficial effects of above-mentioned Set Top Box.
These are only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model specification and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (6)
1. a Set Top Box, is characterized in that, comprises blender, modulator-demodulator and RF trapper; Described blender comprises the first transmission ends for transmitting upward signal, for the second transmission ends of transmission of downlink signal and the common transmission end that is connected with cable TV network, described first transmission ends is connected with described modulator-demodulator, and described second transmission ends is connected with described RF trapper.
2. Set Top Box as claimed in claim 1, it is characterized in that, described RF trapper comprises input, output, is located at described input and is connected in series some filter capacitors between output successively and transfers to the trap circuit of described output for limiting described upward signal from described input; Described input is connected with described second transmission ends, and described output is used for being connected with the tuner of television set.
3. Set Top Box as claimed in claim 2, is characterized in that, filter capacitor described in each connects a trap circuit away from the side correspondence of described input, and the frequency filtering of each trap circuit is inconsistent.
4. Set Top Box as claimed in claim 3, is characterized in that, described trap circuit is inductance or described trap circuit is the inductance of series connection mutually and the resonant circuit of electric capacity formation.
5. the Set Top Box as described in any one of claim 2 to 4, is characterized in that, described filter capacitor comprises the first filter capacitor, the second filter capacitor, the 3rd filter capacitor and the 4th filter capacitor that are connected in series successively from described input to output; Described trap circuit comprises the first trap circuit, the second trap circuit, the 3rd trap circuit and the 4th trap circuit; Described first trap circuit comprises the first inductance, and one end of described first inductance is connected to the public connecting end of the first filter capacitor and the second filter capacitor, other end ground connection; Described second trap circuit comprises the second inductance and the first resonant capacitance, and one end of described second inductance is connected to the public connecting end of described second filter capacitor and the 3rd filter capacitor, and the other end is by described first resonant capacitance ground connection; Described 3rd trap circuit comprises the 3rd inductance and the second resonant capacitance, and one end of described 3rd inductance is connected to the public connecting end of described 3rd filter capacitor and the 4th filter capacitor, and the other end is by the second resonant capacitance ground connection; Described 4th trap circuit comprises the 4th inductance and the 3rd resonant capacitance, and one end of described 4th inductance is connected with described output, and the other end is by the 3rd resonant capacitance ground connection.
6. a digital intergrated unit television system, it is characterized in that, comprise television set and with Set Top Box according to any one of claim 1 to 5, the tuner of described television set is connected with blender by RF trapper, and the network interface of described television set is connected with blender by modulator-demodulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520719208.9U CN205105346U (en) | 2015-09-16 | 2015-09-16 | STB and digital all -in -one television system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520719208.9U CN205105346U (en) | 2015-09-16 | 2015-09-16 | STB and digital all -in -one television system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205105346U true CN205105346U (en) | 2016-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520719208.9U Expired - Fee Related CN205105346U (en) | 2015-09-16 | 2015-09-16 | STB and digital all -in -one television system |
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| Country | Link |
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| CN (1) | CN205105346U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792137A (en) * | 2016-12-06 | 2017-05-31 | 北京四达时代软件技术股份有限公司 | Set Top Box radio frequency modulation processing method and device |
-
2015
- 2015-09-16 CN CN201520719208.9U patent/CN205105346U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792137A (en) * | 2016-12-06 | 2017-05-31 | 北京四达时代软件技术股份有限公司 | Set Top Box radio frequency modulation processing method and device |
| CN106792137B (en) * | 2016-12-06 | 2020-06-26 | 北京四达时代软件技术股份有限公司 | Set-top box radio frequency RF modulation processing method and device |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160323 Termination date: 20200916 |