The direct broadcast satellite system ABS-S is a new generation satellite digital TV transmission system with Chinese independent standards. Nationalchip has been approved by the State Administration of Radio, Film and Television to develop the ABS-S demodulation chip (GX1121). In order to shorten the manufacturer's development cycle and reduce the BOM cost of the whole machine, "GX1121 (ABS-S demodulation chip) and GX3001 (MPEG2 decoding chip)" were introduced. Set of programs. The World Peace Group (WPI) integrates a Nationalchip "GX3001+GX1121" chipset solution and uses a product line of internal agents to launch a complete ABS-S set-top box solution based on the Nationalchip "GX3001+GX1121" chipset solution.
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Main chip GX3001:
* 32-bit RISC CPU, 8K bytes instruction cache and 8K bytes data cache, the highest frequency is 216MHz, support JTAG debugging.
* Support conditional reception and data broadcasting.
* 33 PID screening programs, each PID filter supports up to 32 common channels, each channel has a filtering depth of 16 Bytes.
* Four-layer graphic display: background layer, static picture layer, video layer, OSD layer.
* True color OSD and powerful 2D graphics acceleration for anti-flicker filtering.
* Flexible Screen capture function, support for various multi-screen browsing and continuous shooting functions.
* High performance video scaling and deinterlacing performance, supporting progressive output.
* Supports a variety of PAL (including PAL-M/N/Nc), NTSC TV system, and their conversion.
* Integrated four-channel video DAC, support the following output interface modes: 2CVBS/S-Video, CVBS/YCbCr, CVBS/RGB, YPbPr, RGB (progressive).
Demodulation chip GX1121:
* Support ABS-S broadcast mode (QPSK/8PSK) and LDPC channel error correction code.
* Internally integrated high precision dual 10-bit ADC, IQ imbalance compensation.
* Supports all roll-off factors defined by ABS-S: 0.20/0.25/0.35.
* Support the following LDPC code rate:
o QPSK: 1/4, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 13/15, 9/10;
o 8PSK: 3/5, 2/3, 3/4, 5/6, 13/15, 9/10.
* Pilot mode is supported and the pilot length is automatically recognized.
* High performance equalizer to effectively eliminate echo interference.
* Advanced power management with typical power consumption <200mW.
* Accurate signal strength and signal quality indicators for satellite antenna adjustment.
* Flexible and configurable TS output port.
* Support DiSEqC 2.2.
* LQFP100 package.
* 3.3V/1.2V power supply.
Sharp6306 Can Tuner :
* Sharp6306 supports the standards for DVB-S and ABS-S satellite digital TV.
* Receive input frequency range: 950 to 2150 MHz.
* Input signal level: -65 to -25 dBm.
* Sharp6306 Can Tuner has been widely used in the domestic live broadcast star market and has been recognized by customers.
System hardware design:
Figure 1: System application block diagram
Figure 2: System Solution Board
Software UI interface:
The State Administration of Radio, Film and Television has strict design requirements for the software interface of the live broadcast star. The software solution based on the "GX3001+GX1121" platform has passed the network test of the SARFT and fully complies with the test standards. The system application software interface is shown in Figure 3.
Figure 3: Application Software Interface
summary
The "GX1121+GX3001 chipset" solution has the advantage of cost-effectiveness and is an ideal choice for the overall solution of the live satellite ABS-S set-top box. Mature software and hardware design enables customers to quickly achieve mass production in the shortest possible time.
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