通過改變數(shù)字媒體內(nèi)容傳輸方式，高性能數(shù)字媒體技術(shù)能夠?qū)⒁曨l、音頻和數(shù)據(jù)內(nèi)容集成到許多不同的新型應(yīng)用中。數(shù)字媒體所面臨的挑戰(zhàn)包括在無線和有線網(wǎng)絡(luò)中的視頻、音頻和數(shù)據(jù)流的同步處理中，如何實(shí)現(xiàn)實(shí)時性能、更高的信道密度和軟件編程的靈活性。典型的數(shù)字媒體處理功能包括編碼和解碼媒體流，自動代碼轉(zhuǎn)換(transcoding)（將一種格式轉(zhuǎn)換成另一種格式）和自動視頻轉(zhuǎn)換(transrating)流（將大比特率按比例縮放成小比特率）以適用于不同的體系水平。其它的處理功能包括壓縮、解壓縮、加密、信息分包以及媒體流的傳輸。
機(jī)頂盒部分組成元器件為：
TMS320DM644x 數(shù)字媒體處理器
TMS320DM64x™數(shù)字媒體處理器
MSP430x20x1/MSP430x20x2/MSP430x20x3: 微控制器
TFP510/TFP513: PanelBus™ 數(shù)字發(fā)送器
TSB43DA42: 第三代集成的IEEE 1394a Link/PHY
TSB41AB2: IEEE 1394a-2000 兩端口電纜收發(fā)器/仲裁器
PCF8574/PCF8574A: I/O 擴(kuò)展器
TS5A23157: 雙路SPDT 5-V 模擬開關(guān)
PCA9539: 16位I2C和帶中斷的SMBus I/O 擴(kuò)展器
PCA9545A: 4路帶中斷和復(fù)位的I2C 開關(guān)
PCM1850/PCM1851: 帶輸入復(fù)接器的立體聲ADC
THS7303: 3路具有SAG修正的視頻放大器
下面對各個元器件的性能和方框圖進(jìn)行描述：
下圖為基于TMS320DM644x有VOD使能的IP機(jī)頂盒方框圖

下圖為基于TMS320DM64x™數(shù)字媒體處理器的VOD使能的IP機(jī)頂盒方框圖

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