MULTIMEDIA INPUT / OUTPUT TECHNOLOGIES A.Aruna, Assistant Professor, Faculty of Information Technology 4/24/2017 FULL MOTION VIDEO

A.Aruna, Assistant Professor, Faculty of Information Technology 4/24/2017 INTRODUCTION Most Important and Complex and allow video image processing

A.Aruna, Assistant Professor, Faculty of Information Technology 4/24/2017 VIDEO CAMERAS Used for business multimedia Application – in terms of Image Capture and Processing Commercial video cameras and hobby cameras TV Viewer, Monitors CCD

FULL MOTION VIDEO CONTROLLERS A.Aruna, Assistant Professor, Faculty of Information Technology 4/24/2017 FULL MOTION VIDEO CONTROLLERS Complex component – Analyse the requirements Full Motion Video Controller Requirements Video controller for Play back Start at Capture Stage – Where the video to be Recorded Professional or Unprofessional Setting – Capture based on interest Signal Quality

VIDEO BOARD ARCHITECTURE A.Aruna, Assistant Professor, Faculty of Information Technology 4/24/2017 VIDEO BOARD ARCHITECTURE Similar to video frame grabber board – circuit card in a computer Components Video INPUT – accept the input Signal(NTSC/PAL/SECAM broadcast Signal, Video Camera or VCR S- Video – accept RS170 input Video Compression and Decompression Processor Audio Compression and Decompression Processor A/D Converter and vice versa Audio INPUT for Stereo Audio LINE IN,CD IN (CD Audio Input) Microphone

VIDEO BOARD ARCHITECTURE A.Aruna, Assistant Professor, Faculty of Information Technology 4/24/2017 VIDEO BOARD ARCHITECTURE Handle variety of audio and video input signal and convert from analog to digital and Vice versa Also required for video playback boards Rendering support for various television signal formats - NTSC for North America, PAL For Europe & Asia, SECAM for France and Middle East and So on - Level of Complexity of design the video boards

VIDEO BOARD ARCHITECTURE A.Aruna, Assistant Professor, Faculty of Information Technology 4/24/2017 VIDEO BOARD ARCHITECTURE Video Channel Multiplexer – multiple input for different video input Video Compression and Decompression Compress and decompress the video data Mpeg 2 standard for real time full motion video Motion jpeg, ITT H.261 for Video Conferencing Provide algorithm support multiple standards for single board On board programmable engine – video playback Not only flexible to modify the algorithm by developing new microcode if the standards changes Dynamically change the compression and decompression standards on file formats

VIDEO BOARD ARCHITECTURE A.Aruna, Assistant Professor, Faculty of Information Technology 4/24/2017 VIDEO BOARD ARCHITECTURE User to pick and choose the particular algorithm before capture and playback Flexibility to play or create a file format with a particular algorithm Different stage for compression and decompression processor DCT Inverse DCT Quantization Inverse Quantization Zig Zag and Zero Runlength Encoding and Decoding Motion Estimation and Compension

VIDEO BOARD ARCHITECTURE A.Aruna, Assistant Professor, Faculty of Information Technology 4/24/2017 VIDEO BOARD ARCHITECTURE Audio Compression MPEG 2 standard for audio Compression and Decompression Needs programmable engine on a board Microcode for the new Algorithm – without developing the card Adaptive pulse code modulation for sample the audio signal Takes the difference between actual sample value and predicted sample values Difference is then encoded by 4 bit or 8 bit value based on sampling rate

VIDEO BOARD ARCHITECTURE A.Aruna, Assistant Professor, Faculty of Information Technology 4/24/2017 VIDEO BOARD ARCHITECTURE A / D Converter Inputs from video switch and convert the amplitude of a sampled analog signal to either 8bit or 16 bit value 4 Important Process Sampling Rate Resolution Linearity Conversion Speed

Audio Compression and Decompression A.Aruna, Assistant Professor, Faculty of Information Technology 4/24/2017 Audio Compression and Decompression Video Compression and Decompression D/A Converter Audio LINE OUT RS 422 FOR VCR CAMERA ISA Bus for PC Multi Channel Video switch and A/D Converter NTSC PAL SECAM S VIDEO Video Frame Memory Microphone Stereo Line in CD Audio in Audio Input Switch