CN201345687Y - TV set top box - Google Patents
TV set top box Download PDFInfo
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- CN201345687Y CN201345687Y CNU2008202056849U CN200820205684U CN201345687Y CN 201345687 Y CN201345687 Y CN 201345687Y CN U2008202056849 U CNU2008202056849 U CN U2008202056849U CN 200820205684 U CN200820205684 U CN 200820205684U CN 201345687 Y CN201345687 Y CN 201345687Y
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Abstract
The utility model provides a TV set top box. A selection signal output module and an RF signal modulation module are arranged in a tuner, and a decoding main chip is provided with a selection signal port and a channel selection port. The utility model does not need to change any connection mode, and the decoding main chip also does not need to process the analog signals and other signals in a cable television, only by the simple control of the TV set-top box, both the digital TV programs and the analog TV programs can be watched; and the utility model can simply and effectively achieve the receiving of digital-analog TV signals and the shunting use of other various high-frequency signals with lower cost.
Description
Technical field
The utility model relates to the CATV set-top-box technology, specifically is meant a kind of TV set-top box that can control and handle multiple TV signal.
Background technology
At present, TV user watches that the set-top box that Digital Television is used mainly contains three kinds, first kind of set-top box as shown in Figure 1, this set-top box is made up of tuner, band pass filter (bandpass network), decoding master chip, video conversion circuit and audio conversion circuit, and low noise amplifier input matching circuit and digital frequency down circuit are arranged in the tuner; Described tuner links to each other with the decoding master chip by data/address bus I2C, digital frequency down circuit in the described tuner links to each other with the decoding master chip by band pass filter, the decoding master chip links to each other with the external television audio signal input end by audio conversion circuit, and the decoding master chip links to each other with the external television video signal input terminal by video conversion circuit.After wired TV signal enters tuner, decode digital audio and video signals and digital video signal through the processing of low noise amplifier input matching circuit, digital frequency down circuit frequency reducing, band pass filter frequency-selecting, decoding master chip, digital audio and video signals is delivered to external electric video/audio signal input after the audio conversion circuit D/A switch becomes simulated audio signal, digital video signal output analog video signal after the video conversion circuit buffering is amplified is delivered to outside TV video signal input terminal.As shown in Figure 1, this set-top box can only be handled the digital signal in the cable TV signal, finally transfer audio-video signal to, can not watch the analog television program in the cable TV signal, can not have only the TV set aerial input and do not have the television set of audio-video signal input to be connected use with more traditional.
Second kind of set-top box as shown in Figure 2, this set-top box is made up of tuner, band pass filter (bandpass network), decoding master chip, audio conversion circuit and video conversion circuit, and low noise amplifier input matching circuit, digital frequency down circuit and straight-through output module are arranged in the tuner; Described tuner links to each other with the decoding master chip by data/address bus I2C, digital frequency down circuit in the described tuner links to each other with the decoding master chip by band pass filter, the input of set-top box is connected with the cable TV incoming line, the output of straight-through output module links to each other with the TV set aerial input, the decoding master chip links to each other with the external television audio signal input end by audio conversion circuit, and the decoding master chip links to each other with the external television video signal input terminal by video conversion circuit.When wired TV signal enters tuner after the processing of low noise amplifier input matching circuit, digital frequency down circuit frequency reducing, band pass filter frequency-selecting, decoding master chip decode digital audio and video signals and digital video signal, digital audio and video signals is delivered to external electric video/audio signal input after the audio conversion circuit D/A switch becomes simulated audio signal, digital video signal output analog video signal after the video conversion circuit buffering is amplified is delivered to outside TV video signal input terminal.Cable TV signal can be not treated directly from straight-through output module output after entering tuner yet.Hence one can see that, this set-top box can only be imported the signal (this end can not be exported the signal of digital television program) of analog television program to the antenna input of outside TV, audio-video signal input input digit signal of TV program to outside TV, for the television set that does not have antenna input and audio-video signal input simultaneously, then can not watch analog television program and digital television program simultaneously.
The third set-top box as shown in Figure 3, this set-top box is made up of tuner, decoding master chip, radiofrequency signal modulation module, band pass filter, memory, audio conversion circuit and video conversion circuit, wherein tuner links to each other with the decoding master chip by band pass filter, memory links to each other with the decoding master chip by data/address bus I2C, and the radiofrequency signal modulation module links to each other with the decoding master chip with audio conversion circuit by video conversion circuit respectively.Low noise amplifier input matching circuit, digital frequency down circuit and analog signal frequency down circuit are arranged in the described tuner; Audio output port, VT mouth, digital medium-frequency signal input port and analog if signal input port are arranged in the described decoding master chip.Divide two paths of signals enter the low noise amplifier input matching circuit of tuner when wired TV signal after, one road signal is digital signal is delivered to the decoding master chip by band pass filter after digital frequency down circuit is handled a digital medium-frequency signal input port, and another road signal is analog signal and other signal are delivered to the decoding master chip by band pass filter after the analog signal frequency down circuit is handled an analog if signal input port.Digital signal after band pass filter is handled, analog signal and other signal are through decoding master chip decoding processing, the decoding master chip decodes digital audio and video signals and digital video signal, digital audio and video signals is by the audio output port output of decoding master chip, after becoming simulated audio signal, the audio conversion circuit D/A switch delivers to external electric video/audio signal input, digital video signal is exported by video-out port, amplify back output analog video signal through video conversion circuit buffering and deliver to outside TV video signal input terminal, also can deliver to the radiofrequency signal modulation module through simulated audio signal that the audio conversion circuit D/A switch becomes and the analog video signal after the video conversion circuit buffering is amplified, exported and be modulated to high frequency analog signals and deliver to outside TV.This shows, decoding master chip in the existing set-top box not only carries out decoding processing to the digital signal in the cable TV, also need the analog signal in the cable TV and other signal are carried out decoding processing, complex disposal process, power consumption is bigger, and the analog signal in the original cable TV signal expression effect is also not ideal enough after treatment.
The utility model content
The purpose of this utility model is to overcome the shortcoming of prior art with not enough, propose a kind of simple and reasonable for structure, need not to adjust the mode of connection in use, only need by can realize selecting to watch the TV set-top box of digital television program or analog television program to the simple control of set-top box.
The purpose of this utility model is achieved through the following technical solutions: a kind of TV set-top box comprises band pass filter, decoding master chip, tuner, memory, audio conversion circuit and video conversion circuit; Described band pass filter two ends link to each other with the decoding master chip with tuner respectively, and the decoding master chip links to each other with tuner with memory respectively by data/address bus, and the decoding master chip links to each other with tuner with video conversion circuit by audio conversion circuit respectively; Digital frequency down circuit, low noise amplifier input matching circuit are arranged in the described tuner, select signal output module and radiofrequency signal modulation module in the described tuner in addition; Described low noise amplifier input matching circuit input is connected with the cable TV incoming line, an output of low noise amplifier input matching circuit links to each other with digital frequency down circuit, and another output of low noise amplifier input matching circuit links to each other with selecting signal output module; Described selection signal output module input links to each other with the radiofrequency signal modulation module, selects the signal output module output to link to each other with the TV set aerial input; Described digital frequency down circuit links to each other with the decoding master chip respectively with data/address bus by band pass filter; Described decoding master chip is provided with selects signal port, channel selection port, digital audio and video signals output port and digital video signal output port, wherein select signal port to link to each other with selecting signal output module, the digital audio and video signals output port links to each other with the audio conversion circuit input, the digital video signal output port links to each other with the video conversion circuit input, and audio conversion circuit output, video conversion circuit output and channel selection port link to each other with the radiofrequency signal modulation module respectively.
For better realizing the utility model, described audio conversion circuit output can link to each other with the television audio signals input, and described video conversion circuit output can link to each other with the television video frequency signal input.
Described tuner model is the UBDOOAL of SANYO company, the ATSC single-chip LG1111T that described decoding master chip model is a LG company.
Described store memory is provided with Control Software, send control signal by data/address bus to the decoding master chip, the decoding master chip selects signal output module and radiofrequency signal modulation module to handle the audio-video signal signal by selecting signal port, channel selection port controlling, realizes the selection output to signal.
The course of work of the present utility model is:
(1) decoding master chip and tuner are divided into high-frequency digital signal, high frequency analog signals and other signal by data/address bus both-way communication transmission control command behind the cable TV signal process low noise amplifier input matching circuit;
(2) select to watch analog television program as if the user, then high frequency analog signals and other signal need not directly to deliver to the selection signal output module through the processing of decoding master chip, pending or selection; When if the user selects to watch digital television program, then high-frequency digital signal is a digital intermediate frequency signal through digital frequency down circuit frequency reducing, digital intermediate frequency signal enters decoding master chip inside and carries out decoding processing after band pass filter is selected frequency, decode digital audio and video signals and digital video signal, digital audio and video signals becomes simulated audio signal through the audio conversion circuit D/A switch, digital video signal is the output analog video signal after the video conversion circuit buffering is amplified, then simulated audio signal and analog video signal are delivered to the radiofrequency signal modulation module of tuner, through the control information of decoding master chip channel selection port output channel, the radiofrequency signal modulation module is modulated at simulated audio signal and analog video signal and delivers to the selection signal output module after any high frequency points changes high frequency analog signals into, and is pending or select;
(3) the decoding master chip selects signal port output to select signal controlling information to selecting signal output module, selects signal output module to select signal to output to outside TV antenna input then.
For better realizing the utility model, the described decoding master chip of step (2) decodes digital audio and video signals and digital video signal, digital audio and video signals is delivered to external electric video/audio signal input after the audio conversion circuit D/A switch becomes simulated audio signal, digital video signal output analog video signal after the video conversion circuit buffering is amplified is delivered to outside TV video signal input terminal.
Operation principle of the present utility model is: the utility model has mainly utilized traditional television set can receive the function of analog signal, after only the digital signal in the TV signal being transported to decoding master chip decoding in the set-top box, decode digital audio and video signals and digital video signal, digital audio and video signals becomes simulated audio signal through the audio conversion circuit D/A switch, digital video signal is the output analog video signal after the video conversion circuit buffering is amplified, the radiofrequency signal modulation module that simulated audio signal and analog video signal are delivered to tuner is modulated then, delivers to the TV set aerial input at last.Analog signal in the TV signal is then directly delivered to the TV set aerial input by the control of this set-top box.Like this, need not change any mode of connection, the decoding master chip also need not be handled the analog signal in the cable TV and other signal, only needs can watch digital television program by the simple control to set-top box, can watch analog television program again.With lower cost, realized taking in concurrently and purpose that the shunt of other various high-frequency signals is used of digital-to-analogue TV signal simply and effectively.
The utility model compared with prior art has following advantage and beneficial effect:
(1) easy to use; The utility model need not to adjust the mode of connection in use, only needs can realize selecting to watch digital television program or analog television program by the simple control to set-top box, operate easylier, has more hommization, is more suitable for domestic consumer's use.
(2) applicability is good; The television set function that the utility model is primarily aimed at present cable TV subscriber's use has bigger difference, there are many users still using traditional television set (to have only input end of analog signal, and do not possess digital signal input end) characteristics and design, make this set-top box can satisfy the instructions for use of different television sets, the scope of application is wider comparatively generally.
(3) simple in structure, processing procedure is reasonable; Existing set-top box will realize its function, generally need simultaneously digital signal in the cable TV and analog signal to be carried out decoding processing, the utility model then only needs the digital signal in the cable TV is handled, and to input/output signal, especially the analog signal influence is less.
(4) power consumption is lower; The relative prior art of complete machine work, complete machine work power consumption 0.1W only when receiving anolog TV signals.
Description of drawings
Fig. 1 is the structural representation of existing a kind of set-top box;
Fig. 2 is the structural representation of existing second kind of set-top box;
Fig. 3 is the structural representation of existing the third set-top box;
Fig. 4 is the structural representation of the utility model set-top box;
Fig. 5 is the circuit theory diagrams of tuner;
Fig. 6 is the first local circuit theory diagrams of decoding master chip;
Fig. 7 is the second local circuit theory diagrams of decoding master chip;
Fig. 8 is the circuit theory diagrams of audio conversion circuit;
Fig. 9 is the circuit theory diagrams of video conversion circuit;
Figure 10 is the workflow diagram of set-top box shown in Figure 4.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment
Fig. 4～Fig. 9 shows concrete structure of the present utility model, and by Fig. 4～Fig. 9 as seen, this set-top box comprises band pass filter (bandpass network), decoding master chip, tuner, memory, audio conversion circuit and video conversion circuit; Described band pass filter two ends link to each other with the decoding master chip with tuner respectively, and the decoding master chip links to each other with tuner with memory respectively by data/address bus I2C, and the decoding master chip links to each other with tuner with video conversion circuit by audio conversion circuit respectively; Digital frequency down circuit, low noise amplifier input matching circuit are arranged in the described tuner, select signal output module and radiofrequency signal modulation module; Described low noise amplifier input matching circuit input is connected with the cable TV incoming line, an output of low noise amplifier input matching circuit links to each other with digital frequency down circuit, and another output of low noise amplifier input matching circuit links to each other with selecting signal output module; Described selection signal output module input links to each other with the radiofrequency signal modulation module, selects the signal output module output to link to each other with the TV set aerial input; Described digital frequency down circuit links to each other with the decoding master chip respectively with data/address bus I2C by band pass filter; Described decoding master chip is provided with selects signal port, channel selection port, digital audio and video signals output port and digital video signal output port, wherein select signal port to link to each other with selecting signal output module, the digital audio and video signals output port links to each other with the audio conversion circuit input, the digital video signal output port links to each other with the video conversion circuit input, and audio conversion circuit output, video conversion circuit output and channel selection port link to each other with the radiofrequency signal modulation module respectively.The Audio output port of described decoding master chip links to each other with the television audio signals input, and the VT mouth of described decoding master chip links to each other with the television video frequency signal input.It is the tuner of UBDOOAL that the tuner of this set-top box adopts SANYO company model, and the decoding master chip adopts the ATSC single-chip (LG1111T) of LG company.Audio conversion circuit is for adopting the CS4344 of Renesas, and video conversion circuit adopts the beautiful MM1671 that goes up U.S. company.
The process of this set-top box work as shown in figure 10, specifically: open this set-top box, decoding master chip and memory communicate with one another, the decoding master chip calls memory program, then, the U1 of decoding master chip, 10 of U2 pin (see figure 6) and tuner, 11 pin (SCL, SDA) both-way communication transmission control command.
When the user will use set-top box to watch digital television program, power supervisor give tuner 3,8,16 pin power supply (see figure 5), the high-frequency digital signal of cable TV incoming line is imported by tuner input RF in, demodulate digital intermediate frequency signal and export, deliver to decoding master chip Y1, W1 pin (see figure 6) by 13,14 pin.Digital intermediate frequency signal converts simulated audio signal to through the audio conversion circuit (see figure 8) again and exports from 7,8 pin from Y12, the output of W11 pin (see figure 7) after decoding master chip inner decoding goes out digital audio and video signals.Digital intermediate frequency signal is exported analog video signal by the 2nd pin from the output of M20 pin (see figure 7) after video conversion circuit (see figure 9) buffering is amplified after decoding master chip inner decoding goes out digital video signal.Simulated audio signal is input to the 1st pin of tuner, analog video signal is input to the 5th pin of tuner, then, give the decoding master chip by send instruction by set-top box remote controller, send control signal from the D3 pin (see figure 6) of decoding master chip and give tuner the 2nd pin, the radiofrequency signal modulation module through tuner inside is modulated on 3 or 4 channels and exports to the required high-frequency signal of external television by set-top box output RF OUT again.
When the user need watch analog television program with this set-top box, by the switch for the treatment of of treating switch or machinery panel on the set-top box remote controller, set-top box just was in holding state.Control signal outputs to the 6th pin of tuner by the H20 pin (see figure 7) of decoding master chip, and signal controlling elects.Power control part divides continuation to give the power supply of the inner selection of tuner signal output module, and the selection analog signal directly is given on the antenna input of external television from tuner inside by set-top box output RF 0UT output.Realize not spending the TV programme that the connected mode that changes set-top box and television set just can normally be watched simulation.
The foregoing description is the utility model preferred implementation; but execution mode of the present utility model is not limited by the examples; other any do not deviate from change, the modification done under spirit of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.
Claims (3)
1, a kind of TV set-top box comprises band pass filter, decoding master chip, tuner, memory, audio conversion circuit and video conversion circuit; Described band pass filter two ends link to each other with the decoding master chip with tuner respectively, and the decoding master chip links to each other with tuner with memory respectively by data/address bus, and the decoding master chip links to each other with tuner with video conversion circuit by audio conversion circuit respectively; Digital frequency down circuit, low noise amplifier input matching circuit are arranged in the described tuner, it is characterized in that: select signal output module and radiofrequency signal modulation module in the described tuner in addition; Described low noise amplifier input matching circuit input is connected with the cable TV incoming line, an output of low noise amplifier input matching circuit links to each other with digital frequency down circuit, and another output of low noise amplifier input matching circuit links to each other with selecting signal output module; Described selection signal output module input links to each other with the radiofrequency signal modulation module, selects the signal output module output to link to each other with the TV set aerial input; Described digital frequency down circuit links to each other with the decoding master chip respectively with data/address bus by band pass filter; Described decoding master chip is provided with selects signal port, channel selection port, digital audio and video signals output port and digital video signal output port, wherein select signal port to link to each other with selecting signal output module, the digital audio and video signals output port links to each other with the audio conversion circuit input, the digital video signal output port links to each other with the video conversion circuit input, and audio conversion circuit output, video conversion circuit output and channel selection port link to each other with the radiofrequency signal modulation module respectively.
2, a kind of TV set-top box according to claim 1 is characterized in that: described audio conversion circuit output links to each other with the television audio signals input, and described video conversion circuit output links to each other with the television video frequency signal input.
3, a kind of TV set-top box according to claim 1 is characterized in that: described tuner model is the UBDOOAL of SANYO company, the ATSC single-chip LG1111T that described decoding master chip model is a LG company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202056849U CN201345687Y (en) | 2008-12-22 | 2008-12-22 | TV set top box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202056849U CN201345687Y (en) | 2008-12-22 | 2008-12-22 | TV set top box |
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| Publication Number | Publication Date |
|---|---|
| CN201345687Y true CN201345687Y (en) | 2009-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202056849U Expired - Fee Related CN201345687Y (en) | 2008-12-22 | 2008-12-22 | TV set top box |
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| CN (1) | CN201345687Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103369393A (en) * | 2012-03-31 | 2013-10-23 | 深圳光启创新技术有限公司 | Satellite TV set top box |
| CN107770469A (en) * | 2016-08-15 | 2018-03-06 | 晨星半导体股份有限公司 | Television video signal processing circuit and related television signal processing method |
| CN109510646A (en) * | 2018-11-01 | 2019-03-22 | 昆明理工大学 | A kind of digital simulation audio signal self adaption input processing device |
-
2008
- 2008-12-22 CN CNU2008202056849U patent/CN201345687Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103369393A (en) * | 2012-03-31 | 2013-10-23 | 深圳光启创新技术有限公司 | Satellite TV set top box |
| CN107770469A (en) * | 2016-08-15 | 2018-03-06 | 晨星半导体股份有限公司 | Television video signal processing circuit and related television signal processing method |
| CN109510646A (en) * | 2018-11-01 | 2019-03-22 | 昆明理工大学 | A kind of digital simulation audio signal self adaption input processing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091111 Termination date: 20100122 |