基于CX25858設計的8路音視頻譯碼方案
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多路音/視頻譯碼器評估板CX25838-EVK
圖2.評估板CX25838-EVK外形圖
The stand-alone evaluation kit is designed to showcase the capabilities of Conexant’s CX25838 devices. Each CX25838 device integrates eight high-quality video decoders with eight audio A/Ds, and supports byte and line-interleaved digital video outputs. The CX25838-1x contains a DDR2 interface and supports frame-interleaved outputs as well as 2x2 CIF resolution tiling. Frame-interleaved outputs provide key benefits and additional flexibility to many DVR systems by eliminating glue-logic and lowering codec processing requirements.
The CX25838-2x (without DDR2 interface) may be cascaded with the CX25838- 1x to allow frame-interleaved output of up to 16 video channels. High-speed headers on the board are designed to allow uncompressed video and audio output from the CX25838 devices to easily cable over to H.264 development platforms. The CX25838 contains enhancements specific to surveillance applications, such as programmable motion detection, expanded line-locked camera frequency ranges, and enhanced low-level input locking capabilities.
The CX25838 Evaluation Kit also includes Conexant’s CX25874 video encoders, which accept BT.656 data from the CX25838 multi-channel decoders and generate analog composite, S-Video, and component outputs. Additionally, Conexant’s CX20709 device accepts digital audio data from the CX25838 and converts it to analog output.
The evaluation kit is controlled with a user-friendly PC application, which interfaces to the board via USB. In addition to controlling the board, the USB interface allows bridging of video data from the CX25838 to the PC, for evaluation of pure digital video.
The CX25838 Evaluation Kit provides DVR manufacturers with a simple, yet powerful evaluation and development platform for systems based on the device. The CX25838 is the world’s only eight-channel integrated audio/video decoder for surveillance DVR applications.
Benefits
Conexant CX25838
Eight Video Decoders and Audio A/Ds: Highest level of integration, smallest PCB footprint
Frame-Interleaved Video Outputs: Eliminate glue-logic and reduce codec overhead
Designed Specifically for Video Surveillance DVR Applications: Motion Detection,Line-Locked Camera, and Low-Level Input Features
5-line comb filtering: Excellent luma/chroma separation for best image quality and lowest compression bitrate Conexant CX25874
Four high-performance, 10-bit DAC outputs support composite, S-Video, and component analog out
Adaptive flicker filtering and peaking filters for text sharpness
圖3.多路音/視頻譯碼器評估板(CX25838/CX25874/CX20709)方框圖本文引用地址：http://www.104case.com/article/166714.htm
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