Satellite set top box

Abstract

The utility model discloses a satellite set top box, which relates to the field of satellite communication and comprises an input interface, a demodulation chip, an embedded processor and an output interface. The input interface is used for receiving TS stream signals; the demodulation chip is coupled with the input interface and the embedded processor at the same time, the demodulation chip and the embedded processor are connected through a USB interface, and the demodulation chip demodulates a TS stream signal and performs format conversion on the demodulated TS stream signal to obtain a data stream packet in a USB transmission format; and the embedded processor receives the data stream packet in the USB transmission format through the USB interface and performs audio and video decoding to obtain an audio and video signal, and the audio and video signal is transmitted to a display terminal through the output interface. According to the satellite set top box, TS stream transmission is realized through the USB interface, the number of cables on hardware is reduced, transmission interference and radiation are also reduced, and the satellite set top box is more convenient to use.

Description

Technical Field

[0001] The utility model relates to the technical field of satellite communications, in particular to a satellite set-top box. Background Art

[0002] Satellite communication refers to the use of satellites as relay stations to forward microwave signals and communicate between multiple ground stations. Currently, the most common satellite communication method is broadcast communication, that is, the ground station at the sending end broadcasts the communication content to multiple receiving end user devices via satellite. With the popularization of digital communication technology, the signals transmitted in current satellite communications are basically encoded digital signals, and some signals are even encrypted. This requires that the receiving end device must have decoding or even decryption processing capabilities in addition to the receiving antenna. For example, the existing satellite TV receiving end, in addition to the receiving antenna, must also be equipped with a set-top box to convert the received satellite signal into a digital or analog TV signal and provide it to the user's TV device.

[0003] Existing satellite set-top boxes generally use a main control chip with a TS stream interface for signal transmission. This method requires a large number of cables, resulting in high usage costs, complex and messy cable connections, or large transmission interference. For example, parallel TS stream interface transmission requires 11 cables, while if a serial TS stream interface is used for signal transmission, only 4 cables are required. However, the clock frequency of signal transmission can reach 120MHz, which causes greater interference and radiation.

[0004] Therefore, the existing technology still needs to be improved and developed. Utility Model Content

[0005] The technical problem to be solved by the utility model is that, in view of the above-mentioned defects of the prior art, a satellite set-top box is provided, which aims to solve the problem that the existing satellite set-top box adopts a main control chip with a TS stream interface for signal transmission, resulting in a large number of chaotic cable connections, high costs or large signal transmission interference.

[0006] The present application provides a satellite set-top box, which adopts the following technical solution:

[0007] A satellite set-top box, comprising: an input interface, a demodulation chip, an embedded processor and an output interface;

[0008] The input interface is used to receive TS stream signals;

[0009] The demodulation chip is coupled to the input interface and the embedded processor at the same time. The demodulation chip and the embedded processor are connected via a USB interface. The demodulation chip demodulates the TS stream signal and performs format conversion on the demodulated TS stream signal to obtain a data stream packet in a USB transmission format.

[0010] The embedded processor receives the data stream packet in the USB transmission format through the USB interface, and performs audio and video decoding to obtain audio and video signals, and the audio and video signals are transmitted to the display terminal through the output interface.

[0011] Furthermore, the embedded processor is a microcontroller.

[0012] Furthermore, the A10 pin (USB0_DP) of the microcontroller is connected to the thirty-third pin (USB0DP) of the demodulation chip, and the B10 pin (USB0_DM) of the main control chip is connected to the thirty-fourth pin (USB0DM) of the demodulation chip.

[0013] Furthermore, the microcontroller adopts HI 398MV300.

[0014] Furthermore, the demodulation chip adopts GX6605S.

[0015] Furthermore, the output interface includes a USB output interface, an HDMI interface and an AV interface. The output interface uses the hardware decoding channel of the embedded processor to connect the HDMI interface to drive the display. The HDMI interface is used for high-definition video output, the USB output interface is used as a reserved interface, and the AV interface is used to transmit audio and video signals.

[0016] Furthermore, the embedded processor is also connected to a WIFI module, and the WIFI module is used to wirelessly connect to a router, so that the embedded processor obtains a video signal in a network database, decodes the video signal, and transmits it to a display terminal for display.

[0017] Furthermore, the embedded processor is also connected to the first data storage chip, the second data storage chip and the program storage chip.

[0018] Furthermore, the embedded processor is also connected to an LED display light and supports receiving infrared remote control signals, and the LED display light is used to display program channel numbers.

[0019] Furthermore, the demodulation chip is also connected to a CA interface, and the CA interface is used to insert a CA decryption card.

[0020] The beneficial effects of the utility model are as follows: the application receives satellite signals through the satellite antenna of the satellite set-top box, and then the high-frequency satellite signal is converted by the frequency band of the high-frequency head to obtain an intermediate frequency signal, and the intermediate frequency satellite signal is transmitted to the demodulation chip for demodulation and format conversion, and the demodulation chip converts the demodulated TS stream signal into a data stream packet in the USB transmission format, and then transmits it to the embedded processor through the USB interface for audio and video decoding, and finally displays the audio and video screen on the display terminal through the output interface. The embedded processor in the application only has a USB interface and does not have a TS stream interface, so that the satellite set-top box realizes TS stream transmission through the USB interface, simplifies the number of cables on the hardware, reduces transmission interference and radiation, and is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is an overall architecture diagram of a satellite set-top box provided by an embodiment of the present invention.

[0022] Figure 2 This is a first schematic diagram of an embedded processor of a satellite set-top box provided by an embodiment of the present invention.

[0023] Figure 3 The schematic diagram of the demodulation chip of the satellite set-top box provided by the embodiment of the present invention.

[0024] Figure 4 It is a second principle diagram of the embedded processor of the satellite set-top box and a circuit connection diagram of the HDMI interface provided by an embodiment of the present invention.

[0025] Figure 5 The present invention is a schematic diagram of a high-frequency head of a satellite set-top box provided in an embodiment of the present invention.

[0026] Figure 6 It is a principle diagram of a CA card of a satellite set-top box provided by an embodiment of the present invention.

[0027] Figure 7 This is a third schematic diagram of the embedded processor of the satellite set-top box provided by an embodiment of the present invention.

[0028] Figure 8 It is a fourth principle diagram of the embedded processor of the satellite set-top box provided by an embodiment of the present invention.

[0029] Fig. 9 It is a schematic diagram of a first data storage chip of a satellite set-top box provided by an embodiment of the present invention.

[0030] Fig.10 It is a schematic diagram of a second data storage chip of a satellite set-top box provided by an embodiment of the present invention.

[0031] Fig.11It is a fifth principle diagram of the embedded processor of the satellite set-top box and a circuit connection diagram of the WI FI module provided by an embodiment of the present invention.

[0032] Fig.12 The schematic diagram is a schematic diagram of an embedded processor power supply portion of a satellite set-top box provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present application discloses a satellite set-top box. To make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] like Figure 1 As shown, an embodiment of the present application discloses a satellite set-top box, which includes: an input interface, a demodulation chip, an embedded processor and an output interface; the input interface is used to receive a TS stream signal; the demodulation chip simultaneously couples the input interface and the embedded processor, the demodulation chip and the embedded processor are connected via a USB interface, the demodulation chip demodulates and converts the TS stream signal to obtain a data stream packet in a USB transmission format; the embedded processor receives the data stream packet in the USB transmission format via the USB interface, and performs audio and video decoding to obtain an audio and video signal, and the audio and video signal is transmitted to a display terminal via the output interface.

[0035] What the digital TV set-top box receives is a stream of segments, called Transport Stream, and each TS stream carries information for signal transmission. TS stream requires a special interface for transmission, and this interface is generally an ASI interface (asynchronous serial interface). When using the ASI interface to connect, there are problems such as a large number of cables and confusion, as well as transmission interference. In this regard, the present application adopts a USB interface to realize TS stream transmission, reducing signal interference and the number of cable connections.

[0036] DVB-S digital satellite live broadcast system standard uses satellite as the transmission medium and puts video, audio and business information into a fixed-length packaged MPEG-2 transport stream. The main difference between using different transmission media is the different modulation and demodulation methods, but the source coding and transmission format are the same, using a unified MPEG-2TS stream multiplexing.

[0037] In actual use, the satellite set-top box has a satellite antenna and can receive satellite signals (DVB-S signals). This satellite signal is a high-frequency signal. After the frequency band of the high-frequency head is converted, the intermediate frequency signal is obtained, and then transmitted to the demodulation chip for demodulation. Since the demodulation chip and the embedded processor are only connected through the USB interface, the demodulated TS stream signal is transmitted through the USB interface. The USB interface refers to Figure 1 The embedded processor decodes the TS stream signal and displays the audio and video on the display terminal through the output interface. The display terminal can be a digital TV, a computer, etc.

[0038] Specifically, the embedded processor in the present application only has a USB interface and does not have a TS interface. Therefore, during the signal transmission process, the demodulation chip converts the demodulated TS stream signal into a data stream packet in the USB transmission format, and then transmits it to the embedded processor through the USB interface for audio and video decoding, and finally displays the audio and video screen on the display terminal through the output interface, thereby using the USB interface to realize TS stream transmission, simplifying the number of cables in the hardware, reducing transmission interference and radiation, and making it more convenient to use.

[0039] Specifically, the embedded processor is a microcontroller, and the microcontroller adopts HI 398MV300. The embedded processor system based on the microcontroller has a large amount of digital processing reading and writing back, adopts the method of separating the instruction and data spaces, and uses two buses to access the two spaces respectively. The signal processing volume is large, the processing speed is very fast, and the application is good. In addition, a high-speed RAM is generally provided inside the DSP.

[0040] HI 398MV300 is a high-performance chip that integrates a 4-core 64-bit high-performance Cortex A53 processor and a multi-core high-performance 2D / 3D acceleration engine; supports H.265 4Kx2K@P60 10bit ultra-high-definition video decoding, high-performance H.264 high-definition video encoding, HDR video decoding and display, Do l by and DTS audio processing; built-in USB2.0, SD IO3.0 and other rich peripheral interfaces. Using the HI 398MV300 chip as the processor, it provides the industry's best user experience in terms of image quality, bitstream compatibility, video playback fluency and overall performance.

[0041] Specifically, Figure 2 and Figure 3 As shown, the A10 pin (USB0_DP) of the main control chip is connected to the 33rd pin (USB0DP) of the demodulation chip to transmit the GX6605S_USB0DP signal, and the B10 pin (USB0_DM) of the main control chip is connected to the 34th pin (USB0DM) of the demodulation chip to transmit the GX6605S_USB0DM signal.

[0042] After the demodulation chip demodulates the received TS stream signal, it converts the format to obtain a USB format data stream packet, and then transmits it to the main control chip through the 33rd and 34th pins of the demodulation chip for audio and video decoding. This transmission method uses the USB interface to transmit the TS stream signal, and only two wires are required for connection. There are fewer wires, low costs, simple and beautiful wire connections, no space is taken up, and transmission interference and radiation are also reduced.

[0043] In some embodiments, Figure 2 and Figure 4 As shown, the output interface of the embedded processor includes a USB output interface, an HDMI interface and an AV interface (not shown in the figure), wherein the output interface uses the hardware decoding channel of the embedded processor to connect to the HDMI interface or the AV interface to drive the display, the HDMI interface is used for high-definition video output, and the HDMI interface transmits digital audio and video signals, and the AV interface is used for audio and video output, and the AV interface transmits analog audio and video signals. The USB output interface is used as a reserved interface for connecting external USB devices, making the set-top box more compatible. The USB output interface is Figure 1 The USB1 and USB2 interfaces in the .

[0044] Specifically, the B9 pin (USB1_DP) and C9 pin (USB1_DN) of the main control chip and the L19 pin (USB1_DN) and L20 pin (USB1_DP) of the main control chip serve as the output interface of the embedded processor - the USB interface. The A14 pin (HDM I_TXON) of the main control chip is connected to the ninth pin of the HDMI interface, the B14 pin (HDM I_TXOP) of the main control chip is connected to the seventh pin of the HDMI interface, the B13 pin (HDM I_TX1 N) of the main control chip is connected to the sixth pin of the HDMI interface, the C13 pin (HDMI_TX1 P) of the main control chip is connected to the fourth pin of the HDMI interface, the B12 pin (HDM I_TX2N) of the main control chip is connected to the third pin of the HDMI interface, and the C12 pin (HDMI_TX2P) of the main control chip is connected to the first pin of the HDMI interface.

[0045] In some embodiments, after receiving the satellite signal, the satellite antenna converts the frequency band of the high-frequency head to obtain a medium- and low-frequency signal, which is then transmitted to the demodulation chip for demodulation and format conversion. The high-frequency head includes a radio frequency front-end chip for frequency band conversion, such as Figure 5As shown, the twelfth pin of the RF front-end chip is connected to the thirty-first pin of the demodulation chip, the thirteenth pin of the RF front-end chip is connected to the thirty-second pin of the demodulation chip, the fourteenth pin of the RF front-end chip is connected to the twenty-ninth pin of the demodulation chip, and the fifteenth pin of the RF front-end chip is connected to the thirtieth pin of the demodulation chip. The satellite signal is transmitted to the demodulation chip via the RF front-end chip. Specifically, the demodulation chip adopts GX6605S. The demodulation chip has a built-in 64MByte memory, and supports demodulation of input signals and supports H.264 high-definition decoding chip. The demodulation chip is also connected to the program storage chip and the CA interface. The CA interface is used to insert a CA decryption card to decrypt the encrypted signal. As shown Figure 6 As shown, the SC1_CLK end of the CA interface is connected to the twelfth pin of the demodulation chip, the SC1_CD end of the CA interface is connected to the fifteenth pin of the demodulation chip, the SC1_RST end of the CA interface is connected to the thirteenth pin of the demodulation chip, and the SC1_DATA end of the CA interface is connected to the sixteenth pin of the demodulation chip.

[0046] In some embodiments, the main control chip is also connected to the data storage chip and the program storage chip, wherein the data storage chip DDR is used to store data. After power failure, the data stored inside it disappears. After power failure of the program storage chip EMMC, the stored content does not disappear, and it is generally used to store programs. The data storage chip DDR includes a first data storage chip DDRA and a second data storage chip DDRB, which is a 32-bit bus storage composed of two 16-bit storage chips. Figure 7 As shown, the EMMC_CDATA0-EMMC_CDATA7 pins, EMMC_CCLK_OUT pin, EMMC_CCMD pin, EMMC_DATA_STROBE pin and EMMC_RST pin of the main control chip are connected to the program storage chip EMMC.

[0047] like Fig. 9 As shown in FIG. 1 , it is a schematic diagram of the first data storage chip DDRA. Fig.10 As shown, it is a schematic diagram of the second data storage chip DDRB, combined with Figure 8 It can be seen that the A0-A14 pins of the first data storage chip and the second data storage chip are respectively connected to the DDR_A0-DDR_A14 pins of the main control chip, the DQ0-DQ15 pins of the first data storage chip are respectively connected to the DDR_DQ0-DDR_DQ15 pins of the main control chip, and the DQ16-DQ31 pins of the second data storage chip are respectively connected to the DDR_DQ16-DDR_DQ31 pins of the main control chip. The remaining connection methods of the first data storage chip, the second data storage chip and the main control chip are the same, which will not be repeated here.

[0048] In some embodiments, the main control chip is also connected to a WI FI module, which supports an SD IO interface. The WIFI module can be connected to an antenna (2.4G or 5G) on a router for wireless transmission, so that the main control chip can obtain video signals from a network database through the WI FI module, and decode the video signals and transmit them to a display terminal for display, thereby realizing functions similar to an OTT set-top box, which is more practical. Specifically, Fig.11 As shown, the SD IO1_CMD pin of the embedded processor is connected to the 17th pin of the WI FI chip, the SD IO1_CCLK_OUT pin of the embedded processor is connected to the 18th pin of the WI FI chip, the SD IO1_CCDATA0 pin of the embedded processor is connected to the 19th pin of the WI FI chip, the SD IO1_CDATA1 pin of the embedded processor is connected to the 20th pin of the WI FI chip, the SDIO1_CDATA2 pin of the embedded processor is connected to the 21st pin of the WI FI chip, and the SD IO1_CDATA3 pin of the embedded processor is connected to the 22nd pin of the WI FI chip. Fig.12 As shown, they are the schematic diagrams of the grounding part and the power supply part of the embedded processor.

[0049] In some embodiments, the main control chip is also connected to an LED display light for displaying the program channel number, specifically, Figure 7 As shown, the GPIO5_3LED_CLK pin, GPIO5_0 / LED_DATA pin and GPIO5_4 pin of the main control chip are connected to the LED display light.

[0050] In some embodiments, the main control chip also supports infrared remote control signals to wirelessly control the set-top box. Figure 7 As shown, the GPIO5_5 / IR_IN pin of the main control chip is used to receive the infrared remote control signal IR_IN.

[0051] Compared with the prior art, the utility model has the following advantages:

[0052] 1. The present application receives satellite signals through the satellite antenna of the satellite set-top box, and then obtains the intermediate frequency signal after the high-frequency satellite signal is converted by the frequency band of the high-frequency head. The intermediate frequency signal is transmitted to the demodulation chip for demodulation and format conversion. The demodulation chip converts the demodulated TS stream signal into a data stream packet in the USB transmission format, and then transmits it to the embedded processor through the USB interface for audio and video decoding, and finally displays the audio and video screen on the display terminal through the output interface. The embedded processor in the present application only has a USB interface and does not have a TS stream interface. Therefore, the satellite set-top box realizes TS stream transmission through the USB interface, which not only simplifies the number of cables on the hardware, but also reduces transmission interference and radiation, making it more convenient to use.

[0053] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A satellite set-top box, characterized in that: include: Input interface, demodulation chip, embedded processor and output interface; The input interface is used to receive TS stream signals; The demodulation chip is coupled to the input interface and the embedded processor at the same time. The demodulation chip and the embedded processor are connected via a USB interface. The demodulation chip demodulates the TS stream signal and performs format conversion on the demodulated TS stream signal to obtain a data stream packet in a USB transmission format. The embedded processor receives the data stream packet in the USB transmission format through the USB interface, and performs audio and video decoding to obtain audio and video signals, and the audio and video signals are transmitted to the display terminal through the output interface.

2. The satellite set-top box according to claim 1, characterized in that: The embedded processor is a microcontroller.

3. The satellite set-top box according to claim 2, characterized in that: The microcontroller adopts HI398MV300, the demodulation chip adopts GX6605S, the A10 pin (USB0_DP) of the microcontroller is connected to the thirty-third pin (USB0DP) of the demodulation chip, and the B10 pin (USB0_DM) of the microcontroller is connected to the thirty-fourth pin (USB0DM) of the demodulation chip.

4. The satellite set-top box according to claim 1, characterized in that: The output interface includes a USB output interface, an HDMI interface and an AV interface. The output interface uses the hardware decoding channel of the embedded processor to connect the HDMI interface to drive the display. The HDMI interface is used for high-definition video output. The USB output interface is used as a reserved interface. The AV interface is used to transmit audio and video signals.

5. The satellite set-top box according to claim 1, characterized in that: The embedded processor is also connected to a WIFI module, and the WIFI module is used to wirelessly connect to a router, so that the embedded processor obtains a video signal in a network database, decodes the video signal, and transmits it to a display terminal for display.

6. The satellite set-top box according to claim 1, characterized in that: The embedded processor is also connected to the first data storage chip, the second data storage chip and the program storage chip.

7. The satellite set-top box according to claim 1, characterized in that: The embedded processor is also connected to an LED display light and supports receiving infrared remote control signals, wherein the LED display light is used to display program channel numbers.

8. The satellite set-top box according to claim 1, characterized in that: The demodulation chip is also connected to a CA interface, and the CA interface is used to insert a CA decryption card.

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