CN101426102B - Protection method of high frequency head short circuit protection system of digit-analog integrated TV - Google Patents
Protection method of high frequency head short circuit protection system of digit-analog integrated TV Download PDFInfo
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- CN101426102B CN101426102B CN2008102197926A CN200810219792A CN101426102B CN 101426102 B CN101426102 B CN 101426102B CN 2008102197926 A CN2008102197926 A CN 2008102197926A CN 200810219792 A CN200810219792 A CN 200810219792A CN 101426102 B CN101426102 B CN 101426102B
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Abstract
The invention discloses a digital-analog integrated TV tuner short circuit protective system, including a tuner, an analog demodulator, a digital demodulator, a display screen, an analog decoder, a digital decoder, a FLASH memory and an SDRAM memory, wherein, the tuner is connected to the analog demodulator and the digital demodulator; the digital decoder is connected to the digital demodulator, the analog decoder, the FLASH memory and the SDRAM memory; and the analog decoder is connected to the analog demodulator and the display screen. The present invention also discloses a protection method of the digital-analog integrated TV tuner short circuit protective system. The digital-analog integrated TV tuner short circuit protective system adopts a method of combining the software and hardware to realization the digital-analog integrated TV tuner short circuit protective function.
Description
Technical field
The present invention relates to the analogue digital integrated television tuner, be specifically related to a kind of tuner short circuit protection system for analogue digital integrated television and guard method thereof.
Background technology
At present; the tuner of analogue digital integrated television does not generally have short-circuit protection function; even have generally also is pure realization technology; the shortcoming of pure hardware implementation mode: adopt relevant components and parts more; cost is more expensive; can not judge when how many times electricity steps down to be short circuit by software, and can not realize ejecting OSD printed words (as short circuit) and remind the user.
Summary of the invention
The present invention provides the tuner short circuit protection system for analogue digital integrated television that a kind of cost is low, improve usage safety performance in order to overcome the deficiency that above prior art exists.
Another object of the present invention is to provide a kind of guard method of tuner short circuit protection system for analogue digital integrated television.
Purpose of the present invention realizes by following technical scheme: the guard method of this tuner short circuit protection system for analogue digital integrated television is characterized in that:
Described tuner short circuit protection system for analogue digital integrated television, comprise tuner, analog demodulator, digital demodulator, display screen, analog decoder, digital decoder, FLASH memory and SDRAM memory, described tuner is connected with analog demodulator, digital demodulator, digital decoder is connected with digital demodulator, analog decoder, FLASH memory, SDRAM memory, and analog decoder is connected with analog demodulator, display screen;
The chip of described analog demodulator adopts TDA9886, and the chip of digital demodulator adopts DIB3000MC, and the chip of analog decoder adopts MST726, and the chip of digital decoder adopts ZR39130, and display screen is 7 inches LCD display;
Described MST726 chip I mouth SAR2/GPIO 28 line ANT_SHORT and tuner power supply ANT+5V are connected in parallel;
Described MST726 chip I mouth GPIO 4/P0.4 line and ZR39130 chip I mouth GPIO20 line are connected in parallel;
Described MST726 chip I mouth P5.0 line and ZR39130 chip I mouth GPIO 17 lines connect together;
Described digital decoder is powered to tuner, and analogue digital integrated television switches in the Digital Television state, and analog decoder carries out voltage detecting to tuner, detects whether short circuit; When the tuner short circuit, analog decoder detects the tuner short circuit, and analog decoder is transmitted the remote control code value and given digital decoder, and analog decoder calls correlation function makes the display screen display alarm information remind the user, digital decoder stops power supply to tuner after receiving this remote control code value.
Described warning message is " ANTENNA SHORT OUT ".
The present invention has following advantage with respect to prior art: this tuner short circuit protection system for analogue digital integrated television, ingenious employing software and hardware method that combines realizes analogue digital integrated television tuner short circuit protection function.By software analog decoder is provided with; the critical value of voltage is set; when voltage during less than critical value; then be judged to be short circuit, send the remote control code value and give digital decoder, and make display screen eject relevant warning message simultaneously; just the user reminded in OSD printed words (On Screen Display); digital decoder stops power supply to tuner after receiving this remote control code value, thereby realizes the tuner short circuit protection function.
Description of drawings
Fig. 1 is the frame diagram of a kind of tuner short circuit protection system for analogue digital integrated television of the present invention.
Fig. 2 is MST726 chip and related peripheral circuit diagram.
Fig. 3 is the relevant connection circuit diagram that the tuner short circuit is judged.
Fig. 4 is tuner and related peripheral circuit diagram.
Fig. 5 is ZR39130 chip and related peripheral circuit diagram.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
A kind of tuner short circuit protection system for analogue digital integrated television as shown in Figure 1; comprise tuner, analog demodulator, digital demodulator, display screen, analog decoder, digital decoder, FLASH memory and SDRAM memory; described tuner is connected with analog demodulator, digital demodulator; digital decoder is connected with digital demodulator, analog decoder, FLASH memory, SDRAM memory, and analog decoder is connected with analog demodulator, display screen.
The chip of analog demodulator adopts TDA9886, and the chip of digital demodulator adopts DIB3000MC, and the chip of analog decoder adopts MST726, and the chip of digital decoder adopts ZR39130, and display screen is 7 inches LCD display.
MST726 chip I mouth SAR2/GPIO 28 line ANT_SHORT and tuner power supply ANT+5V are connected in parallel.
MST726 chip I mouth GPIO 4/P0.4 line and ZR39130 chip I mouth GPIO20 line are connected in parallel.
MST726 chip I mouth P5.0 line and ZR39130 chip I mouth GPIO 17 lines connect together.
The guard method of above-mentioned tuner short circuit protection system for analogue digital integrated television is specially: digital decoder is powered to tuner, and analogue digital integrated television switches in the Digital Television state, and analog decoder carries out voltage detecting to tuner, detects whether short circuit; When the tuner short circuit, analog decoder detects the tuner short circuit, analog decoder is transmitted the remote control code value and is given digital decoder, analog decoder calls correlation function makes display screen display alarm information " ANTENNA SHORT OUT " remind the user, digital decoder stops power supply to tuner after receiving this remote control code value.
Now above-mentioned guard method is described in further detail:
As shown in Figure 2, MST726 chipset analog codec, LCD display driving, MCU IO mouth operating function are one.MST726 chip I mouth SAR2/GPIO 28 has input/output function and the A/D conversion is arranged, and detects voltage 0-5V function, and the tuner power supply ANT+5V of MST726 chip I mouth SAR2/GPIO 28 line ANT_SHORT and Fig. 3 is connected in parallel.The ZR39130 chip I mouth GPIO20 line of MST726 chip I mouth GPIO 4/P0.4 line and Fig. 5 is connected in parallel.ZR39130 chip I mouth GPIO 17 lines of MST726 chip I mouth P5.0 line and Fig. 5 connect together, MST726 chip I mouth P5.0 has remote control code value forwarding capability, and ZR39130 chip I mouth GPIO 17 reception remote control code values ZR39130 chip reception remote control code value instruction are then done associative operation.
The tuner supply power voltage provides during by ZR39130 chip I mouth GPIO20 high level: analogue digital integrated television switches in the Digital Television state, ZR39130 chip I mouth GPIO20 and MST726 chip I mouth GPIO4/P0.4 are high level, in Fig. 4, triode Q14 base stage is a high level, saturation conduction, triode Q14 current collection is low level very, and promptly triode Q13 base stage is a low level, and collector electrode is output as high level ANT+5V and powers to tuner.
Short circuit condition is judged: when MST726 chip I mouth GPIO4/P0.4 was low level, MST726 chip I mouth SAR2/GPIO 28 did not detect voltage, did not detect whether short circuit of tuner; When MST726 chip I mouth GPIO4/P0.4 was high level, MST726 chip I mouth SAR2/GPIO28 detected voltage, detected whether short circuit of tuner; When MST726 chip I mouth GPIO4/P0.4 is high level; when MST726 chip I mouth SAR2/GPIO28 detects to low level; be judged to be short circuit; the MST726 chip is sent out the remote control code value by IO mouth P5.0 and is given the ZR39130 chip; sending instruction behind the ZR39130 chip reception remote control code value makes IO mouth GPIO20 become low level; triode Q14 base stage becomes low level from high level; end; triode Q14 current collection is high level very; be that triode Q13 base stage is a high level; collector electrode no-output voltage is powered to tuner, thereby realizes the tuner short circuit protection function.The MST726 chip calls correlation function and makes LCD display demonstration ANTENNA SHORTOUT prompting user simultaneously.
If MST726 chip I mouth SAR2/GPIO28 detects the critical value of short-circuit voltage, can be provided with by MST726 chip software parameter, if greater than this critical value, then thinks not short circuit less than this critical value, then to be judged to be short circuit.
Above-mentioned embodiment is the preferred embodiments of the present invention; can not limit claim of the present invention; other any change or other equivalent substitute mode that does not deviate from technical scheme of the present invention and made is included within protection scope of the present invention.
Claims (2)
1. the guard method of tuner short circuit protection system for analogue digital integrated television is characterized in that:
Described tuner short circuit protection system for analogue digital integrated television, comprise tuner, analog demodulator, digital demodulator, display screen, analog decoder, digital decoder, FLASH memory and SDRAM memory, described tuner is connected with analog demodulator, digital demodulator, digital decoder is connected with digital demodulator, analog decoder, FLASH memory, SDRAM memory, and analog decoder is connected with analog demodulator, display screen;
The chip of described analog demodulator adopts TDA9886, and the chip of digital demodulator adopts DIB3000MC, and the chip of analog decoder adopts MST726, and the chip of digital decoder adopts ZR39130, and display screen is 7 inches LCD display;
Described MST726 chip I mouth SAR2/GPIO 28 line ANT_SHORT and tuner power supply ANT+5V are connected in parallel;
Described MST726 chip I mouth GPIO 4/P0.4 line and ZR39130 chip I mouth GPIO20 line are connected in parallel;
Described MST726 chip I mouth P5.0 line and ZR39130 chip I mouth GPIO 17 lines connect together;
Described digital decoder is powered to tuner, and analogue digital integrated television switches in the Digital Television state, and analog decoder carries out voltage detecting to tuner, detects whether short circuit; When the tuner short circuit, analog decoder detects the tuner short circuit, and analog decoder is transmitted the remote control code value and given digital decoder, and analog decoder calls correlation function makes the display screen display alarm information remind the user, digital decoder stops power supply to tuner after receiving this remote control code value.
2. the guard method of tuner short circuit protection system for analogue digital integrated television according to claim 1 is characterized in that: described warning message is " ANTENNA SHORT OUT ".
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102197926A CN101426102B (en) | 2008-12-09 | 2008-12-09 | Protection method of high frequency head short circuit protection system of digit-analog integrated TV |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102197926A CN101426102B (en) | 2008-12-09 | 2008-12-09 | Protection method of high frequency head short circuit protection system of digit-analog integrated TV |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101426102A CN101426102A (en) | 2009-05-06 |
| CN101426102B true CN101426102B (en) | 2011-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008102197926A Expired - Fee Related CN101426102B (en) | 2008-12-09 | 2008-12-09 | Protection method of high frequency head short circuit protection system of digit-analog integrated TV |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103873900B (en) * | 2014-03-21 | 2017-02-15 | 深圳市视纬通科技有限公司 | TV multi-tuner switching method |
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Effective date of registration: 20151223 Address after: Chen Jiang Street office Guangdong province 516229 Huizhou Zhongkai Zhongkai high tech Zone Road double light industrial zone DESAY DESAY third new plant on the third floor and seven floor Patentee after: DESAY ELECTRONICS (HUIZHOU) CO., LTD. Address before: 516229 Guangdong city of Huizhou province Chen town DESAY third industrial zone Patentee before: Desai Video-Audio Science & Technology Co., Ltd., Huizhou City |
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| 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: 20110202 Termination date: 20191209 |