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TI 個人錄像機(PVR)/數字媒體中心

2013/10/30 |  2064次閱讀 | 關鍵詞:

 
TI 個人錄像機(PVR)/數字媒體中心
高性能流媒體技術含蓋了各種數字媒體技術和基于媒體的新興技術,能夠將視頻、音頻和數據內容集成到許多不同的新型應用中,并改變了數字媒體內容傳輸的方式。流媒體所面臨的挑戰包括在有線和無線網絡中的視頻、音頻和數據流的同步處理中,如何實現實時性能、更高的信道密度和軟件編程的靈活性。典型的數字媒體處理功能包括編碼和解碼媒體流,自動代碼轉換(transcoding)(將一種格式轉換成另一種格式)和自動視頻轉換(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。

個人錄像機/數字媒體中心部分組成元器件為:

TMS320DM644x:數字媒體處理器

TMS320DM64x:數字媒體處理器

THS7353:3路可選視頻放大器

Filters, 2:1輸入MUX和外部增益控制

下面對各個元器件的性能和方框圖進行描述:

下圖為基于TMS320DM644x數字媒體處理器有IP使能的個人錄像機/數字媒體中心應用方框圖



下圖為基于TMS320DM64x有IP使能的個人錄像機/數字媒體中心應用方框圖



The TMS320DM6446/3 leverage TI&rsquos 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&reg-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



TMS320DM6446數字媒體片上系統(DMSoC)方框圖

The TMS320DM64x digital media processors offer the industry&rsquos highest performance and are programmable protecting your code investment.On-chip video ports offer an easy connection to video devices and are capable of handling both video and audio encode/ decode for IP-based video infrastructure applications.

Key Features

Performance up to 5760 MIPS at 720 MHz

400/500/600 MHz options also available

Multiple input/output glueless interfaces for common video and audio formats

Performance real-time video encoding, decoding/transcoding between CODECs

Three dual-channel video ports support simultaneous video input/output

Advanced connectivity with 10/100 Ethernet MAC and 66 MHz PCI

Ready-to-use application software such as MPEG4, MPEG2, MPEG1,WMV9, H.263, H.261, M-JPEG, JPEG2000, JPEG, H.264 and more

Applications

IP-based video conferencing and IP-based videophones

Network camera-based surveillance and IP video node

Video-on-demand set-top boxes, personal video recorders and digital media centers

Statistical multiplexers and broadcast encoders



TMS320DM642數字媒體處理器方框圖

Fabricated using the BiCOM-III process, the THS7353 is a low-power, three-channel integrated video buffer. It incorporates a able 5th-order Butterworth anti-aliasing/DAC reconstruction filter to eliminate data converter images. Each channel is individually I2C configurable.Its rail-to-rail
output stage allows for both AC and DC coupling applications, and the externally controlled gain adjust pin allows for fine tuning of the gain such as line driving, compensating for cable losses or Sin-X/X compensation.

Key Features

3 video buffers for CVBS, S-Video, SD/ED/HD YPBPR and RGB

I2C control of all functions

Integrated low-pass filters

Selectable input bias modes

2:1 input MUX allows multiple input sources

External gain control range: 0 dB to 14 dB

Single supply: 2.7 V to 5 V

Low quiescent current: 16.2 mA

Differential gain/phase: 0.15/0.3°

Applications

HDTV video buffering

PVR/DVDR output buffering

Projector video buffering

USB/Portable video buffering


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