CN201797571U - On-board set-top box for national standard bus - Google Patents
On-board set-top box for national standard bus Download PDFInfo
- Publication number
- CN201797571U CN201797571U CN 201020554982 CN201020554982U CN201797571U CN 201797571 U CN201797571 U CN 201797571U CN 201020554982 CN201020554982 CN 201020554982 CN 201020554982 U CN201020554982 U CN 201020554982U CN 201797571 U CN201797571 U CN 201797571U
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- top box
- decoding chip
- demodulator
- output interface
- board set
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Abstract
The utility model discloses an on-board set-top box for a national standard bus, which comprises a decoding chip, a high-frequency modulator, a demodulator, a station reporter and a conversion circuit, and is characterized in that the high-frequency modulator is connected with an external antenna, a signal received by the antenna is converted into a middle-frequency signal that is transmitted to the demodulator for processing; TS flow converted by the demodulator is transmitted to the decoding chip; the decoding chip transmits the processed audio and video signals into a display and a loudspeaker by a video output interface and an audio output interface; and the station reporter is connected with the loudspeaker and connected onto the decoding chip by passing the conversion circuit. In the utility model, a complete on-board set-top box for the national standard bus is formed on the basis of most popular radio frequency receiving at the front end, MPEG2 decoding, audio amplification and the like in the market. The on-board set-top box for the national standard bus has the characteristics of simple structure, convenience in use, strong functions, low cost and the like, and is suitable to be widely promoted in the field of the on-board set-top box for buses.
Description
Technical field
The utility model relates to the public transport vehicle-mounted set-top box of a kind of GB.
Background technology
Along with the release of GB terrestrial transmission standard CTTB, there has been the transmission standard of the surface wave of oneself in China, has broken the monopolization of former Europe superscript.Also grow with each passing day to the requirement of wireless ground installation in China big and medium-sized cities, the public transport vehicle-mounted set-top box of GB also releases one after another in each big and medium-sized cities.But also there is not a kind of public transport vehicle-mounted set-top box can receive very complete GB signal.So the public transport vehicle-mounted set-top box of a kind of novel GB is badly in need of being developed.
Summary of the invention
The utility model is at the proposition of above problem, and develops the public transport vehicle-mounted set-top box of a kind of GB.The technological means that the present invention adopts is as follows:
The public transport vehicle-mounted set-top box of a kind of GB is characterized in that comprising decoding chip, high-frequency tuner, demodulator, station reporting instrument and change-over circuit; Described high-frequency tuner is connected with exterior antenna, and the conversion of signals that antenna is received is to be transferred to demodulator after the intermediate-freuqncy signal to handle, and the TS flow transmission after described demodulator will transform is given decoding chip; Described decoding chip will be handled the back audio-video signal and be transferred in display and the loud speaker by video output interface and audio output interface; Described station reporting instrument is connected with loud speaker, is connected on the decoding chip through behind the change-over circuit simultaneously.
Described decoding chip output interface comprises CVBS interface, S-VEDIO interface and optical fiber interface.
Described audio output interface is connected on the loud speaker through behind the power amplifier; Described station reporting instrument also is connected on the loud speaker through behind the power amplifier.
The utility model receives based on most popular front radio-frequency on the market, the MPEG2 decoding, and audio frequency amplifications etc. constitute the public transport vehicle-mounted set-top box of very complete GB.Have characteristics such as simple in structure, easy to use, powerful and with low cost, be suitable for extensively promoting in public transport vehicle-mounted field of set-top.
Description of drawings
Fig. 1 is the structural representation of the public transport vehicle-mounted set-top box of GB described in the utility model;
Fig. 2 is the circuit theory diagrams of rectifier described in the utility model;
Fig. 3 is the circuit theory diagrams of demodulator described in the utility model;
Fig. 4 is the circuit theory diagrams of power amplifier described in the utility model;
Fig. 5 is the circuit theory diagrams of change-over circuit described in the utility model.
Among the figure: 1, decoding chip, 2, high-frequency tuner, 3, demodulator, 4, video output interface, 5, audio output interface, 6, display, 7, power amplifier, 8, loud speaker, 9, station reporting instrument, 10, change-over circuit.
Embodiment
As shown in Figure 1, the public transport vehicle-mounted set-top box of GB described in the utility model comprises decoding chip 1, high-frequency tuner 2, demodulator 3, station reporting instrument 9 and change-over circuit 10; Described high-frequency tuner 2 is connected with exterior antenna, and the conversion of signals that antenna is received is to be transferred to demodulator 3 after the intermediate-freuqncy signal to handle, and the TS flow transmission after described demodulator 3 will transform is given decoding chip 1; Described decoding chip 1 will be handled TS circulation soon and change the analog audio-video signal into, and the back is transferred in display 6 and the loud speaker 8 by video output interface 4 and audio output interface 5; Described station reporting instrument 9 is connected with loud speaker 8, is connected on the decoding chip 1 through behind the change-over circuit 10 simultaneously; Wherein the audio frequency of station reporting instrument 9 outputs in the change-over circuit 10, is to give decoding chip 1 control operation behind the dc level signal with the audible communication conversion of signals.Described decoding chip 1 output interface comprises CVBS interface, S-VEDIO interface and optical fiber interface.Described audio output interface 5 is connected on the loud speaker 8 through behind the power amplifier 7; Described station reporting instrument 9 also is connected on the loud speaker 8 through behind the power amplifier 7.
Wherein high-frequency tuner 2 parts are used is that the special-purpose high-frequency tuner VA1T1EF2092 of GB of SHARP is the high-frequency tuner that SHARP develops for the ground GB specially, and its frequency range is at 474-858MHZ (as shown in Figure 2).Demodulator 3 adopts present DEMOD industry efficient and the outstanding AU8820 of cost performance.AU8820 is the demodulation chip of a single multicarrier compatibility of Ao Wei company release.He is built-in RAM, volume is also littler.Main it at anti-multipath with face and outstanding performance (as shown in Figure 3) is arranged aspect the interference frequently.Decoding chip 1 (MPEG II) has adopted the platform of the HI3110E of Shenzhen Hai Si, and it can contend with ST5105 on the stability of platform and cost performance.Its dominant frequency of HI3110E can reach 300MHZ, supports JAVA to quicken and integrated 2D figure acceleration function, and the powerful support that has 2 USB2.0 interfaces to provide for follow-up expansion of content.Power amplifier 7 has adopted the TFA9810T of NXP.TFA9810T is the D class power amplifier of a BTL formula.When single-ended power supply 12V, its power output maximum can reach 10W, and efficient is 89%.This kind of power amplifier not only has absolute advantage (as shown in Figure 4) on power output.Change-over circuit 10 adopts as shown in Figure 5 circuit structure as the detection of station reporting instrument audio frequency, and when importing if any the station reporting instrument AC audio, this circuit can be converted to dc level signal to the audio signal that exchanges and give master chip and handle.For example can close or reduce the audio frequency of set-top box automatically, the audio frequency of set-top box can not have influence on the passenger and listen to each stop sign information when making station reporting instrument work.
The power supply of above equipment all is to finish (TPS5450 that can adopt TI) by power-supply device; the overvoltage of power supply, under-voltage protecting circuit protection are operated between the 16-36V direct voltage, reduce the driving problems of brownout back-end chip and the overpressure problems of overtension back-end chip.
The above; it only is the preferable embodiment of the utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to replacement or change according to the technical solution of the utility model and inventive concept thereof, all should be encompassed within the protection range of the present utility model.
Claims (3)
1. the public transport vehicle-mounted set-top box of GB is characterized in that comprising decoding chip (1), high-frequency tuner (2), demodulator (3), station reporting instrument (9) and change-over circuit (10); Described high-frequency tuner (2) is connected with exterior antenna, and the conversion of signals that antenna is received is to be transferred to demodulator (3) after the intermediate-freuqncy signal to handle, and the TS flow transmission after described demodulator (3) will transform is given decoding chip (1); Described decoding chip (1) will be handled the back audio-video signal and be transferred in display (6) and the loud speaker (8) by video output interface (4) and audio output interface (5); The same loud speaker of described station reporting instrument (9) (8) is connected, and is connected on the decoding chip (1) after passing through change-over circuit (10) simultaneously.
2. the public transport vehicle-mounted set-top box of a kind of GB according to claim 1 is characterized in that described decoding chip (1) output interface comprises CVBS interface, S-VEDIO interface and optical fiber interface.
3. the public transport vehicle-mounted set-top box of a kind of GB according to claim 1 is characterized in that being connected on the loud speaker (8) after described audio output interface (5) is through power amplifier (7); Described station reporting instrument (9) is connected on the loud speaker (8) after also passing through power amplifier (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020554982 CN201797571U (en) | 2010-09-29 | 2010-09-29 | On-board set-top box for national standard bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020554982 CN201797571U (en) | 2010-09-29 | 2010-09-29 | On-board set-top box for national standard bus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201797571U true CN201797571U (en) | 2011-04-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020554982 Expired - Fee Related CN201797571U (en) | 2010-09-29 | 2010-09-29 | On-board set-top box for national standard bus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201797571U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796764A (en) * | 2015-04-17 | 2015-07-22 | 深圳市东明炬创电子有限公司 | Home audio-visual interconnection system |
-
2010
- 2010-09-29 CN CN 201020554982 patent/CN201797571U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104796764A (en) * | 2015-04-17 | 2015-07-22 | 深圳市东明炬创电子有限公司 | Home audio-visual interconnection 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 |
Granted publication date: 20110413 Termination date: 20170929 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |