通过改变数字媒体内容传输方式，高性能数字媒体技术能够将视频、音频和数据内容集成到许多不同的新型应用中。数字媒体所面临的挑战包括在无线和有线网络中的视频、音频和数据流的同步处理中，如何实现实时性能、更高的信道密度和软件编程的灵活性。典型的数字媒体处理功能包括编码和解码媒体流，自动代码转换(transcoding)（将一种格式转换成另一种格式）和自动视频转换(transrating)流（将大比特率按比例缩放成小比特率）以适用于不同的体系水平。其它的处理功能包括压缩、解压缩、加密、信息分包以及媒体流的传输。

机顶盒部分组成元器件为：
tms320dm644x 数字媒体处理器
tms320dm64x™数字媒体处理器
msp430x20x1/msp430x20x2/msp430x20x3: 微控制器
tfp510/tfp513: panelbus™ 数字发送器
tsb43da42: 第三代集成的ieee 1394a link/phy
tsb41ab2: ieee 1394a-2000 两端口电缆收发器/仲裁器
pcf8574/pcf8574a: i/o 扩展器
ts5a23157: 双路spdt 5-v 模拟开关
pca9539: 16位i2c和带中断的smbus i/o 扩展器
pca9545a: 4路带中断和复位的i2c 开关
pcm1850/pcm1851: 带输入复接器的立体声adc
ths7303: 3路具有sag修正的视频放大器

下面对各个元器件的性能和方框图进行描述：


下图为基于tms320dm644x有vod使能的ip机顶盒方框图



下图为基于tms320dm64x™数字媒体处理器的vod使能的ip机顶盒方框图



the tms320dm6446/3 leverage ti’s davinci™ technology to meet the networked media encode and decode application processing needs of next-generation embedded devices. the dsp subsystem supports a programmable audio/video multimedia engine that provides application
flexibility and support for future codec standards. the integrated arm®-based application processor supports all the required call control,device drivers and network provisioning. the video processing subsystem supports functions such as video resizing, on screen display (osd) support, and a full compliment of video i/o capabilities.
key features
tms320c64x+™ dsp performance: 600 mhz
arm926ej-s performance: 300 mhz
video processing subsystem (vpss) with configurable video/imaging peripheral
highly integrated peripherals; including video accelerators, (4) dacs,hardware osd, usb 2.0 and more
advanced connectivity with 10/100 ethernet mac; half or duplex plus qos support
ready-to-use application software such as h.264, h.263, mpeg4,g.729ab, wvm9 and more
supports glueless interfaces for common video and audio formats
performance real-time image processing, resizing, auto focus and more
ddr2 and sdram support
packaging: 361-pin pb-free bga (zwt suffix; 0.8-mm pitch)
applications
set-top boxes
networked digital media centers
home security