CN201533344U - Circuit for achieving digital optical fiber and digital coaxial compatibility output of set-top box - Google Patents
Circuit for achieving digital optical fiber and digital coaxial compatibility output of set-top box Download PDFInfo
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- CN201533344U CN201533344U CN2009201831581U CN200920183158U CN201533344U CN 201533344 U CN201533344 U CN 201533344U CN 2009201831581 U CN2009201831581 U CN 2009201831581U CN 200920183158 U CN200920183158 U CN 200920183158U CN 201533344 U CN201533344 U CN 201533344U
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Abstract
The utility model relates to a circuit for achieving digital optical fiber and digital coaxial compatibility output of a set-top box, wherein two kinds of digital optical fiber and digital coaxial interfaces are made into a compatible circuit, different interfaces can be made just through welding few different devices on a circuit board, thereby achieving the digital optical fiber and digital coaxial compatibility output of the set-top box. Users can achieve to select the digital coaxial and digital optical fiber interfaces to output adjust through changing the welding and the non-welding of three resistance capacitance components, thereby being convenient for the maintenance of production, also saving partial research and development cost, and increasing the production efficiency.
Description
[technical field]
The utility model belongs to the digital television devices field, specifically is meant a kind of circuit of realizing set-top box digital fiber and the coaxial compatible output of numeral.
[background technology]
Along with the popularization of Digital Television, the user is also more and more to the requirement of digital TV set-top box, the kind of audio-video interface is also required many more, comprises that CVBS, RGB, S terminal, VGA, digital fiber, numeral are coaxial or the like.
Digital fiber and numeral are coaxial to be digital output audio signal, and it is just available to need to change into analog signal through DAC, and the advantage of digital fiber is to grow Distance Transmission, and is lossless in transmission course, can be lossy when conversion; Numeral is coaxial to be that long Distance Transmission is lossy, does not have loss in the time of conversion, generally does the small distance transmission and uses.At present, most of set-top box can be equipped with a digital fiber port or a digital coaxial port according to customer requirement, what need is digital fiber interface and digital coaxial interface that the another one user needs but a situation of very frequent appearance is client of same plank, change plank this time and become the certainty feelings, can increase research staff's workload virtually, operating efficiency has just descended.
The shortcoming of prior art is exactly: interface is not made compatible, need make the independent PCB circuit board of two covers, does the maintenance difficulties that not only can increase the product later stage like this, and has increased research staff's workload in the plank research and development in early stage.The problem that present technique will solve is that these two kinds of interfaces are made compatible circuit, only needs the different device of welding just can make different interfaces on circuit board.
[utility model content]
Technical problem to be solved in the utility model is to provide a kind of circuit of realizing set-top box digital fiber and the coaxial compatible output of numeral, and two kinds of interfaces are made compatible circuit, only needs the different device of welding just can make different interfaces on circuit board.
The utility model adopts following technology to solve the problems of the technologies described above:
A kind of circuit of realizing set-top box digital fiber and the coaxial compatible output of numeral, comprise a positive-negative-positive triode, a NPN type triode, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, first electric capacity, second electric capacity, the 3rd electric capacity, master chip interface, C level ground connection, the E level that the B level of wherein said positive-negative-positive triode is connected to the set-top box mainboard by first resistance is connected to the B level of described NPN type triode; The B level of described NPN type triode by second resistance be connected to the 5V power supply, the C level is connected to first electric capacity, the first electric capacity other end ground connection, the C level of NPN type triode is also connected to the 3rd resistance, the 3rd resistance other end is connected to 1 pin of digital coaxial interface, and the 3rd resistance other end is also connected to second electric capacity, the second electric capacity other end ground connection; The E level of NPN type triode is connected to 3 pin of digital fiber interface, the E level of NPN type triode is also connected to the 4th resistance, the 4th resistance is connected to 2 pin of digital fiber interface by the 3rd electric capacity, and the 4th resistance also connects the 5th resistance, the 5th resistance other end ground connection.
Described first resistance, second resistance, the 4th resistance, the 5th resistance are variable resistors.
Advantage of the present utility model is: digital fiber and the coaxial two kinds of interfaces of numeral are made compatible circuit, only need the different device of welding just can make different interfaces on circuit board, realized the coaxial compatible output of set-top box digital fiber and numeral.
[description of drawings]
The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the utility model circuit connection diagram.
[embodiment]
See also shown in Figure 1, a kind of circuit of realizing set-top box digital fiber and the coaxial compatible output of numeral, comprise a positive-negative-positive triode QA4, a NPN type triode QA5, variable resistor RA26, variable resistor RA17, resistance R A16, variable resistor RA27, variable resistor RA28, capacitor C A14, capacitor C A13, capacitor C A19, wherein the B level of the positive-negative-positive triode QA4 master chip interface, C level ground connection, the E level that are connected to the set-top box mainboard by variable resistor RA26 is connected to the B level of NPN type triode QA5; The B level of NPN type triode QA5 by variable resistor RA17 be connected to the 5V power supply, the C level is connected to capacitor C A14, capacitor C A14 other end ground connection, the C level of NPN type triode QA5 is also connected to resistance R A16, the resistance R A16 other end is connected to 1 pin of digital coaxial interface, and the resistance R A16 other end is also connected to capacitor C A13, capacitor C A13 other end ground connection; The E level of NPN type triode QA5 is connected to 3 pin of digital fiber interface, the E level of NPN type triode QA5 is also connected to variable resistor RA27, variable resistor RA27 is connected to 2 pin of digital fiber interface by capacitor C A1, variable resistor RA27 also connects variable resistor RA28, variable resistor RA28 other end ground connection.
SPDIF signal among the figure is a master chip interface of directly receiving the set-top box mainboard, and P1 is digital coaxial interface, and P2 is the digital fiber interface; When the SPDIF signal was high level, triode QA4 ended, and this moment, the A point was a high level, and the QA5 conducting just obtains a high level at the B point.When plank will be done digital fiber output, the device of the frame of broken lines 1 among the figure is pressed the map parameter welding, the device of frame of broken lines 2 is not welding just, at this moment+power supply of 5V receives 2 pin of digital fiber by resistance R A16, the indicator light that is keeping digital fiber is light yellow always, point out this module for power supply normal, the input build-out resistor of digital fiber is done in resistance R A27 and RA28 series connection, and 3 pin that the level that B point height changes is sent to digital fiber reach the purpose that transmits digital audio and video signals.
When plank will be done digital coaxial output, frame of broken lines 1 among the figure is not welded, frame of broken lines 2 is pressed the parameter welding among the figure, this moment, the SPDIF signal changed by the level of QA4 and QA5, the C point that strengthens under the situation of current driving capability in the drawings can obtain the signal that a high-low level changes, and this level passes through the coupling of capacitor C A19, filtering the DC component of C point signal, this signal has been received digital 1 coaxial pin then, has realized the transmission of digital audio and video signals.
In sum, the user only needs by the welding that changes three capacitance resistance components and does not weld just can reach the selection that output is digital coaxial and digital fiber interface, convenient maintenance of producing.Just can save R﹠D costs partly at the research and development initial stage of product, improve efficient, make things convenient for the later maintenance of product simultaneously.Must not make two different PCB version, only need to select different components and parts welding just passable according to different output.
Claims (2)
1. realize set-top box digital fiber and the coaxial compatible circuit of exporting of numeral for one kind, it is characterized in that: comprise a positive-negative-positive triode, a NPN type triode, first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, first electric capacity, second electric capacity, the 3rd electric capacity, master chip interface, C level ground connection, the E level that the B level of wherein said positive-negative-positive triode is connected to the set-top box mainboard by first resistance is connected to the B level of described NPN type triode; The B level of described NPN type triode by second resistance be connected to the 5V power supply, the C level is connected to first electric capacity, the first electric capacity other end ground connection, the C level of NPN type triode is also connected to the 3rd resistance, the 3rd resistance other end is connected to 1 pin of digital coaxial interface, and the 3rd resistance other end is also connected to second electric capacity, the second electric capacity other end ground connection; The E level of NPN type triode is connected to 3 pin of digital fiber interface, the E level of NPN type triode is also connected to the 4th resistance, the 4th resistance is connected to 2 pin of digital fiber interface by the 3rd electric capacity, and the 4th resistance also connects the 5th resistance, the 5th resistance other end ground connection.
2. a kind of circuit of realizing set-top box digital fiber and the coaxial compatible output of numeral as claimed in claim 1, it is characterized in that: described first resistance, second resistance, the 4th resistance, the 5th resistance are variable resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201831581U CN201533344U (en) | 2009-09-30 | 2009-09-30 | Circuit for achieving digital optical fiber and digital coaxial compatibility output of set-top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201831581U CN201533344U (en) | 2009-09-30 | 2009-09-30 | Circuit for achieving digital optical fiber and digital coaxial compatibility output of set-top box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201533344U true CN201533344U (en) | 2010-07-21 |
Family
ID=42528743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201831581U Expired - Fee Related CN201533344U (en) | 2009-09-30 | 2009-09-30 | Circuit for achieving digital optical fiber and digital coaxial compatibility output of set-top box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201533344U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061109A (en) * | 2016-08-15 | 2016-10-26 | 深圳市明泰电讯有限公司 | Circuit board compatible with crystal, and circuit thereof |
| CN111601155A (en) * | 2020-04-07 | 2020-08-28 | 广东省广播电视网络股份有限公司 | Method for enabling set top box to be compatible with different network access devices and service platforms |
-
2009
- 2009-09-30 CN CN2009201831581U patent/CN201533344U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061109A (en) * | 2016-08-15 | 2016-10-26 | 深圳市明泰电讯有限公司 | Circuit board compatible with crystal, and circuit thereof |
| CN106061109B (en) * | 2016-08-15 | 2018-09-11 | 深圳市明泰电讯有限公司 | A kind of circuit board and its circuit of crystal compatibility |
| CN111601155A (en) * | 2020-04-07 | 2020-08-28 | 广东省广播电视网络股份有限公司 | Method for enabling set top box to be compatible with different network access devices and service platforms |
| CN111601155B (en) * | 2020-04-07 | 2022-05-17 | 广东省广播电视网络股份有限公司 | Method for set top box to be compatible with different network access devices and service platforms |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: Mawei Development Zone, Fujian province Fuzhou Ru Jiang Road 350000, No. 70 (Scud Industrial Park) 6 floor and 5 floor two to four Patentee after: Fujian Newland Communication Science Technology Co., Ltd. Address before: 350000 Fuzhou Province, Mawei District, west of the Confucian Road, No. 1 Patentee before: Fujian Newland Communication Science & Technology Co., Ltd. |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100721 Termination date: 20130930 |