Video Communications System

Block Diagram (SBD) for a Video Communications System featuring a DaVinciTM Digital Media or OMAP35x Processor, analog and digital video inputs, audio I/Os, video outputs, touch panel, an Ethernet connection as well as Power over Ethernet.

Block Diagram

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AC/DC Adaptor

Design Considerations

Video communication endpoints are terminals used to make point-to-point video-enabled calls. Video communications essentially consists of an input video source and base unit interfaced to an output display. Additional features such as human-machine input sources (keyboard, touch panel, etc.) and Ethernet connectivity allow the user to control and transmit data with ease. Data transmission is typically over IP or ISDN networks. The base unit consists of an embedded processor with integrated on-chip peripherals and audio/video acceleration to process audio and video encoding/decoding.

The core system includes:

  • Embedded Processor - Internal host processor moderates input/output data between the microphone, speaker, keyboard, touch panel, and the Digital Signal Processor (DSP). The DSP and associated video accelerators perform real-time image capture processing, compression/decompression, color space conversion, real time display, and data packetization for data communication over the IP/ISDN networks.
  • Video Decoder (ADC) - Digitizes, demodulates, and/or decodes the analog video for the digital video multiplexer to be eventually used by the video processor.
  • Video Encoder / DACs - Converts digital component video signals into the analog domain for display.
  • Audio Interface (Voice Codec) - Interfaces the microphone/speaker and uses a codec to digitize audio signals.
  • Network Interface - Uses an Ethernet PHY transceiver to transmit and receive audio and video data packets through the IP/ISDN networks.
  • Human-machine Interface - Provides the user control of the video communications system by allowing the use of keyboard, mouse, or touch panel to manipulate the data
  • Power Management - There are typically two ways to provide power to these systems; either via an AC wall outlet or via the Ethernet port using Power over Ethernet (PoE). If PoE is used, one can provide as much as 12.95 W to the whole board. More than sufficient for this video endpoint.

Application Notes (5)

Title Abstract Type Size (KB) Date Views
HTM 9 KB 24 Oct 2009 73
HTM 8 KB 02 Mar 2009 151
HTM 8 KB 03 Dec 2008 51
HTM 9 KB 18 Feb 2005 69
HTM 9 KB 03 May 2004 121
    

Reference Designs

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Selection Guides (2)

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PDF 9.51 MB 01 May 2014 22857
PDF 80 KB 18 Jan 2013 1511

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PDF 245 KB 22 Jan 2013 1210
PDF 199 KB 09 Nov 2012 280

White Papers (3)

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PDF 284 KB 29 Mar 2012 124
PDF 667 KB 05 Mar 2012 1392
PDF 147 KB 29 Sep 2008 383

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TI has several embedded-processing solutions tailored for digital video applications.
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