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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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Touch Screen Controller Audio CODEC Microphone Amplifier Speaker Amplifier Clock Real-time Clock General-Purpose Logic HDMI ESD Protection Ethernet PHY AC Adaptor Backlight Memory Power PoE Controller Core and I/O Power System Power Digital Media Processor Sensing & Monitoring Video ADC Analog Filter Op Amp Video DAC Video DAC

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

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