CN201282520Y - Tuner for digital satellite television set-top box - Google Patents
Tuner for digital satellite television set-top box Download PDFInfo
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- CN201282520Y CN201282520Y CNU2008202013735U CN200820201373U CN201282520Y CN 201282520 Y CN201282520 Y CN 201282520Y CN U2008202013735 U CNU2008202013735 U CN U2008202013735U CN 200820201373 U CN200820201373 U CN 200820201373U CN 201282520 Y CN201282520 Y CN 201282520Y
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Abstract
The utility model discloses a tuner of a digital satellite television set-top box, which comprises a radio-frequency pretreatment module, a zero-intermediate-frequency processing module and a DVB-S/S2 demodulation module; the radio-frequency signal source is connected to the radio-frequency signal input terminal of the radio-frequency pretreatment module; the radio-frequency signal output terminal of the radio-frequency pretreatment module is connected with the radio-frequency signal input terminal of the zero-intermediate-frequency processing module; I<2>C bus port of the radio-frequency pretreatment module is connected with the I<2>C bus port of the zero-intermediate-frequency processing module; the I/Q signal output terminal of the zero-intermediate-frequency processing module is connected with the I/Q signal input terminal of the DVB-S/S2 demodulation module; the DVB-S/S2 demodulation module is connected with a control host through the I<2>C bus and streaming data line. The utility model has the advantages that both the DVB-S decoding ability and the DVB-S2 decoding ability are possessed, so that the adaptability to the signal source is improved and the more practicality is possessed. Furthermore, the utility mode can combine with other tuners, so as to increase the video coverage area.
Description
Technical field
The utility model relates to a kind of tuner, relates in particular to a kind of digital satellite television set-top box tuner.
Background technology
Satellite television digital received system is generally the decoder or the set-top box that receive the DVB-S digital satellite signal, at present, generally adopts set-top box to receive the digital satellite television signal of DVB-S standard.Tuner is the main parts size of satellite set top box, its basic function is to receive digital satellite signal (950MHZ-2150MHZ), digital satellite signal is input in the tuner, from this digital satellite signal, select a frequency, through processing such as frequency conversion and demodulation, send into the interior motherboard of set-top box again and carry out the audio/video processing, final output simulation audio/video signal is for using use.DVB-S2 is a digital communication by satellite standard of new generation, and this standard has not only promoted original Channel Transmission capacity greatly, also has good autgmentability and superior transmission, is the mainstream standard of following digital communication by satellite.The tuner that receives at present satellite TV signal on the market can only receive the DVB-S signal.
The utility model content
The utility model purpose is to provide the tuner of the satellite television set-top box of a kind of compatible with DVB-S simultaneously and DVB-S2 signal.
The purpose of this utility model can realize by following scheme: a kind of digital satellite television set-top box tuner comprises: the radio frequency pretreatment module, and the radiofrequency signal filtering, the high frequency that are used for receiving amplify; The zero intermediate frequency processing module, the i/q signal that the radiofrequency signal frequency conversion that is used for receiving is suitable for for the DVB-S/S2 demodulation module; The DVB-S/S2 demodulation module is used for the i/q signal after the frequency conversion is carried out DVB-S and DVB-S2 demodulation; Radio-frequency signal source is connected to the radio-frequency (RF) signal input end mouth of radio frequency pretreatment module, the radio-frequency (RF) signal input end mouth of the radiofrequency signal output port connecting to neutral intermediate frequency process module of radio frequency pretreatment module, the I of radio frequency pretreatment module
2The I of C bus port connecting to neutral intermediate frequency process module
2The C bus port, the i/q signal output port of zero intermediate frequency processing module connects the i/q signal input port of DVB-S/S2 demodulation module, and the DVB-S/S2 demodulation module passes through I
2The C bus is connected with main control system with the data flow data line.
Also be provided with automative interest increasing controlling circuit between described zero intermediate frequency processing module and the DVB-S/S2 demodulation module; The gain input port of zero intermediate frequency processing module connects the gain output port of DVB-S/S2 demodulation module.
Described radio frequency pretreatment module also is provided with the loop of rf output port, is connected to other tuners.
Described radio frequency pretreatment module adopts the low noise high-frequency triode.
Described zero intermediate frequency processing module adopts high performance zero intermediate frequency IC STB6100.
Described DVB-S/S2 demodulation module adopts high integration IC 0903STVABA.
The relative prior art advantage of the utility model is to have had both simultaneously the decoding capability of DVB-S and DVB-S2, has improved the adaptability to signal source, and is practical more.And can unite use by a plurality of tuners, increase the video signal coverage.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
The utility model mainly adopts two chips, one is that the zero intermediate frequency processing module adopts the outstanding zero intermediate frequency IC STB6100 of performance, another is that the DVB-S/S2 demodulation module adopts high integration IC 0903STVBAB, and the high-frequency amplifier circuit in the radio frequency pretreatment module adopts the low noise high-frequency triode.
As shown in Figure 1, radio-frequency signal source is linked into the radio-frequency (RF) signal input end mouth of radio frequency pretreatment module, one road signal outputs to other demodulated equipments through the loop of rf, and other one road signal is linked into the radio-frequency (RF) signal input end mouth of zero intermediate frequency processing module by the radiofrequency signal output port.The i/q signal output port of zero intermediate frequency processing module connects the i/q signal input port of DVB-S/S2 demodulation module, the automatic gain control input end mouth of zero intermediate frequency processing module connects the automatic gain control output end mouth of DVB-S/S2 demodulation module, the I of zero intermediate frequency processing module
2The C bus port connects the I of DVB-S/S2 demodulation module
2The C bus port, the crystal clock output port of zero intermediate frequency processing module connects the crystal clock input port of DVB-S/S2 demodulation module.The DVB-S/S2 demodulation module is by data wire and I
2The C bus is connected with main control system.
Operation principle of the present utility model is as follows:
The digital satellite television signal arrives the zero intermediate frequency processing module again from the rf inputs mouth input of tuner after the output of radio frequency pretreatment module.The zero intermediate frequency processing module is converted to the i/q signal that the DVB-S/S2 demodulation module can be used with radiofrequency signal, is input to the DVB-S/S2 demodulation module again, and the crystal clock signal of low-converter also outputs to the DVB-S/S2 demodulation module.The automatic gain control port of demodulation module is connected with low-converter, forms feedback network, realizes automatic gain control.
The data of demodulation module after with demodulation by data flow output, deliver to the master board of set-top box.The set-top box master board can be passed through I
2The total line traffic control demodulation module of C, and by the I of demodulation module
2C bus and zero intermediate frequency processing module need to select the frequency of demodulation from radiofrequency signal, reach the effect of arbitrarily watching different frequency.
Simultaneously, signal source enters after the module of radio frequency pretreatment module output and can also use in addition other decoding device by the radio-frequency (RF) output end mouth, for example other set-top box.
Claims (6)
1, a kind of digital satellite television set-top box tuner is characterized in that, comprising: the radio frequency pretreatment module, and the radiofrequency signal filtering, the high frequency that are used for receiving amplify; The zero intermediate frequency processing module, the i/q signal that the radiofrequency signal frequency conversion that is used for receiving is suitable for for the DVB-S/S2 demodulation module; The DVB-S/S2 demodulation module is used for the i/q signal after the frequency conversion is carried out DVB-S and DVB-S2 demodulation; Radio-frequency signal source is connected to the radio-frequency (RF) signal input end of radio frequency pretreatment module, the radio-frequency (RF) signal input end mouth of the radiofrequency signal output connecting to neutral intermediate frequency process module of radio frequency pretreatment module, the I of radio frequency pretreatment module
2The I of C bus port connecting to neutral intermediate frequency process module
2The C bus port, the i/q signal input of the i/q signal output termination DVB-S/S2 demodulation module of zero intermediate frequency processing module, the DVB-S/S2 demodulation module passes through I
2The C bus is connected with main control system with the data flow data line.
2, a kind of digital satellite television set-top box tuner according to claim 1 is characterized in that, also is provided with automative interest increasing controlling circuit between described zero intermediate frequency processing module and the DVB-S/S2 demodulation module; The gain output of the gain input termination DVB-S/S2 demodulation module of zero intermediate frequency processing module.
3, a kind of digital satellite television set-top box tuner according to claim 1 is characterized in that described radio frequency pretreatment module also is provided with the loop of rf output, is connected to other tuners.
4, a kind of digital satellite television set-top box tuner according to claim 1 is characterized in that, described radio frequency pretreatment module adopts the low noise high-frequency triode.
5, a kind of digital satellite television set-top box tuner according to claim 1 is characterized in that, described zero intermediate frequency processing module adopts zero intermediate frequency IC STB6100.
6, a kind of digital satellite television set-top box tuner according to claim 1 is characterized in that, described DVB-S/S2 demodulation module adopts high integration IC 0903STVABA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202013735U CN201282520Y (en) | 2008-09-28 | 2008-09-28 | Tuner for digital satellite television set-top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202013735U CN201282520Y (en) | 2008-09-28 | 2008-09-28 | Tuner for digital satellite television set-top box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201282520Y true CN201282520Y (en) | 2009-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202013735U Expired - Fee Related CN201282520Y (en) | 2008-09-28 | 2008-09-28 | Tuner for digital satellite television set-top box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201282520Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860390A (en) * | 2010-05-26 | 2010-10-13 | 南京中网卫星通信股份有限公司 | Star finding method and device of star-aiming mode of compatible carrier wave DVB-S and DVB-S2 |
| CN102186039A (en) * | 2011-05-05 | 2011-09-14 | 广州易迩达电子有限公司 | Five-in-one tuner for television signals |
| CN103533346B (en) * | 2013-10-30 | 2015-09-23 | 上海高清数字科技产业有限公司 | DVB-S and DVB-S2 automatic signal detection system and method |
| CN107623867A (en) * | 2016-07-13 | 2018-01-23 | 络达科技股份有限公司 | Have the top box of digital machine of positioning function and apply its satellite television receiving system |
-
2008
- 2008-09-28 CN CNU2008202013735U patent/CN201282520Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860390A (en) * | 2010-05-26 | 2010-10-13 | 南京中网卫星通信股份有限公司 | Star finding method and device of star-aiming mode of compatible carrier wave DVB-S and DVB-S2 |
| CN101860390B (en) * | 2010-05-26 | 2012-12-26 | 南京中网卫星通信股份有限公司 | Star finding method and device of star-aiming mode of compatible carrier wave DVB-S and DVB-S2 |
| CN102186039A (en) * | 2011-05-05 | 2011-09-14 | 广州易迩达电子有限公司 | Five-in-one tuner for television signals |
| CN102186039B (en) * | 2011-05-05 | 2013-02-06 | 广州易迩达电子有限公司 | Five-in-one tuner for television signals |
| CN103533346B (en) * | 2013-10-30 | 2015-09-23 | 上海高清数字科技产业有限公司 | DVB-S and DVB-S2 automatic signal detection system and method |
| CN107623867A (en) * | 2016-07-13 | 2018-01-23 | 络达科技股份有限公司 | Have the top box of digital machine of positioning function and apply its satellite television receiving system |
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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: 20090729 Termination date: 20170928 |