With the popularity of full high-definition flat-panel TVs, more and more consumers to experience the charm of high-definition digital TV.
HD sources mainly from two sources: First, high-definition television, the second is the network. Many consumers download movies from the Internet to watch, but viewed on a computer monitor to watch far less than the effect on television. Taking into account this part of consumer demand, the World Health Systems has developed an integrated program of TV reception and streaming media player of national standard-definition digital.
Selected media decoding section EM862X company Sigma Design chip as the core product series, and using Linear Technology (Legend Silicon) of LGS-8G52 (supports both single and multi-carrier) chip as the demodulator front-end design, in order to achieve the best performance and It can support different parts of the broadcast mode.
Hardware system architecture design
The video output interface program may support HDMI, YPbPr, VGA, S-Video and CVBS, so customers can choose a different platform as a backend for LCD TV video processing. The overall program with Pixelworks PW338 + PW9800 of 120Hz LCD TV programs, can create a high-performance machine internet.
Using digital tuner Sharp VA1T1ED6093, the product is designed for Sharp DMB-TH standard developed full-band digital tuner, which receives a frequency range of 47MHz to 870MHz, IF bandwidth 8MHz. By using the latest Legend Silicon LGS-8G52 demodulator chip, the first intermediate frequency signal output from the converter through the LGS-8G52 built-in A / D to a digital intermediate frequency signal, and then demodulates and outputs MPEG2-TS (Transport stream) stream and supports 8-bit parallel or serial stream TS. LGS-8G52 chip is the latest Legend Silicon, which optimizes the impulse noise, echo attenuation and handling, stability and power consumption are greatly improved, used in flat-panel TV one machine will not affect the result due to high temperature circumstances quality.
High-definition digital TV stream and hardware design system architecture diagram of a media player integration programs
The media decoding portion uses Sigma Design's EM8622, the EM862x chip has HD decoded playback capabilities, and supports MPEG2 and H.624 decoding, and can output 1080p HD format. EM8622 is a 200MHz ARM core master, which dedicated 32-bit DSP audio processing, 16-bit RISC processor is responsible for video decoding, 32-bit RISC processor core is responsible for demultiplexing. Demultiplexing function of the input MPEG2-TS stream by hardware decoding technology, the basic reply audio and video streams, and stored in the SDRAM, and then through the video decoding module decodes the elementary video stream into the video data, and then processed by a video and an image mixer function modules, outputs the video data after overlap with the menu data.
EM8622 supports multiple video output modes, including analog mode and a digital mode. 8-bit digital mode, 16-bit YCbCr 4: 2: 2 mode, 24 YCbCr 4: 4: 4 mode, 24-bit RGB mode, BT.601 and BT.656, can directly drive the liquid crystal panel, can also HDMI circuit (The AD9889B) digital high-definition image output transmission chip. Analog video output supports NTSC and PAL system formats CVBS, S-Video format, YPbPr and RGB formats. Digital and analog output mode can support 1080P format, the EM8622 is ideal for cross-platform use modular design. The audio signal through the serial digital interface I2S or SPDIF input to the audio processing module, the functional module supports the linear PCM format, MP3 encoding format, AAC-LC 2.0 format, HE-AAC 2.0 format, the BSAC format, Dolby Digital 5.1 format, DTS 5.1 format. Sound processing module outputs audio data through the S / PDIF or I2S digital to analog converter (The CS4344), converts the digital audio data into analog audio signals, or via the HDMI transmitter chip (AD9889) transmitted to the terminal device. In one design of machine, the video signal input PW328 image processor for further processing. Since the LCD panel 100 / 120Hz will be put on the market, so consider reserving expansion interface on one machine design, and designed to support 100 / 120Hz LCD panel modules.
The program as a module design, with strong expansion capability. By U disk or hard disk to store and play AV1, MOV, MP4, MP3 and other audio and video files. Since the basic machine program does not fully meet customer requirements, therefore, also need to be added to the network functions in the program.
Software Architecture Design
Because of the need to support more video formats, and the need to take into account the technical requirements of GB20600-2006 and software scalability, the software system is modular in design, the software architecture can be divided into operating systems, graphical user interfaces, applications, and the middle part piece part.
Since the need to use Flash recording station search data, pre-recorded information, etc., so the program must have the Flash operation modules (including Flash drive), and can read and write to the Flash. Search module searches a program for automatic and manual search and sort, and then the station search results by Flash memory module operation. Program editing module provides lock favorite program or skip functions. Also you can achieve lock, when switching to a preset program need to enter a password to view.
Program recording module is responsible for the MPEG2-TS stream file corresponding program written in a removable hard disk or memory card via the USB interface, the further predetermined recording function set by the program reservation module is responsible for, it can manage the reservation of a program type, and the appointment the start and end time of fixation, including real-time recording, time recording and EPG time video and eliminate conflicts of scheduled video. Connection status of the USB interface to play module key management USB memory, the module can display the file name and type, playing the selected file, and can make the appropriate prompt, provide the respective functions (e.g., fast forward, rewind, pause during playback, recovery, etc.). Also for managing stored files, delete files and format and so on. Network play module for playing a network share folders of audio and video files. Software upgrade module allows users to upgrade through three ways: Serial, USB interface and network, will be responsible for the user-selected target program to upgrade. Demultiplexing means for processing TSD channel, filter, buffer management (including setting the PID, Xie table PAT, PMT table, the SDT tables, etc.), the filter condition is set, the buffer management channel, the CRC verification. EPG module enables 7 days EPG information processing and display, responsible for EPG video settings.
Discussed in this article is the integration of high-definition television design, analog and digital output interface supports 1080P resolution; EPG achieve the display seven days of program information and video can be set according to booking events; support USB2.0 protocol, by having USB interface, high-definition video playback document, support a wide range of audio and video file types; support network transmission, to achieve network player function. Used in the design of the LGS-8G52, implementation supports the national standard (ie single-carrier and multi-carrier compatible). In addition, the network function will be upgraded to support wireless network. Read more
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