TI 视频会议终端解决方案

视频会议客户端是一个可实现点对点通话的终端。典型的视频会议客户端由摄像机和一个能实现视频压缩运算的基本单元构成，该压缩运算可以减小网络带宽，以便在IP或ISDN网络上传输流。

TI公司的视频会议客户端解决方案是以高性能DM64x™和DM644x数字媒体处理器为基础的，该处理器集成了能与多数视频设备方便连接的片上视频端口。对基于IP的视频会议客户端应用来说，DM64x和DM644x系列能同步处理音视频编解码。有竞争力的视频算法，包括H.263和H.264基线框架(baseline profile)视频编译码器，可以通过第三方网站来获得。同时也提供音频编译码器,包括G.72x算法。




视频会议终端的组成元器件为：
TMS320DM6446数字媒体处理器
TMS320DM64x™数字媒体处理器
TLV320AIC33：低功耗、立体声音频编译码器
TLV320AIC12K/TLV320AIC14K/TLV320AIC20K/TLV320AIC24K：低功耗音频转换器

下面对各个元器件的性能和方框图进行描述：

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


The DM64x™ digital media processors have on-chip video ports for easy connection to video devices and are capable of handling both video and audio encode/decode for IP-based video telephony applications.The single programmable digital media processor is a costeffective
solution because the need for external PCI Host Bus connectivity or 10/100 Ethernet MAC is eliminated.
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 and transcoding between CODECs – any video format to any video format
★ Three dual-channel video ports – supports up to six channels of simultaneous video input/output
★ Advanced connectivity with 10/100 Ethernet MAC and 66-MHz PCI
★ Ready to use application software such as MPEG4, WMV9, H.264,H.263, H.261, and more
★ Packaging: 548-pin BGA (23 mm2 GDK and 27 mm2 GNZ)
Applications
★ IP-based video conferencing and IP-based videophones
★ Network camera-based surveillance and IP video nodes
★ Video-on-demand set-top boxes, personal video recorders and digital media centers
★ Statistical multiplexers and broadcast encoders



The TLV320AIC33 is a highly integrated, low-power stereo CODEC for use in a variety of portable audio equipment. The TLV320AIC33 includes six analog inputs, of which four can be configured as differential inputs. The TLV320AIC33 also has seven output drivers and targets cellular telephony applications. The TLV320AIC33 includes three line output drivers and four high-power amplifiers that can be configured as stereo headphone drivers or stereo speaker drivers.
Key Features
★ Stereo DAC (100 dBA) and ADC (92 dBA) support rates up to 96 kSPS
★ 14-mW power dissipation with stereo playback at 48 kSPS
★ Stereo headphone drivers and 500-mW, 8-speaker driver
★ Stereo microphone preamps and hardware automatic gain control
★ Digital microphone interface for low-noise microphone input
★ Integrated PLL for flexible audio clock generation
★ Programmable digital audio bass/treble/EQ with 3D effects
★ Analog inputs are configurable as single-ended or fully differential
★ Dual I2S™/PCM bus architecture with DSP and TDM modes
★ 10 analog input pins, seven output drivers for easy connectivity to multiple devices in a cellular telephony system
★ Packaging: 5 ×5 mm 80-ball BGA
7 ×7 mm 48-pin QFN
Applications
★ Cellular and smart phones
★ Digital still cameras, digital video cameras
★ MP3 and portable media players
★ PDAs



The TLV320AIC12K/14K are single-channel, low-power voice-band CODECs typically used in voice-only applications. The TLV320AIC12K integrates a 16-speaker driver. The TLV320AIC20K/24K are dualchannel,low-power voice-band CODECs typically used in voice-only
applications. The TLV320AIC20K integrates an 8-speaker driver.
Key Features
★ 16-bit, programmable sampling rate up to 26 kSPS
★ Built-in microphone bias/preamp, handset/headset preamps, antialiasing filter and programmable gain amplifier
★ Flexible host port: I2C or S2C
★ SMARTDM serial port
★ 10-mW typical power dissipation (AIC12K/14K)
★ 20-mW typical power dissipation (AIC20K/24K)
★ 16-/8-speaker driver (only on AIC12K/20K)
★ Packaging: 30-pin TSSOP (AIC12K/14K)
48-pin TQFP (AIC20K/24K)
Applications
★ Low-power, portable voice products
★ Voice-over-IP phones (VoIP)
★ Digital telephony
★ Speakerphones