Multimedia outline

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Kh Ravy

multimidea outline.ppt

Technologie Divertissement et humour

Multimedia Sethserey Sam Computer Science Department

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Web applications and the mobile Web are not the only exciting developments in the use of networks. For many people “multimedia” is important, because it involves technical challenges in providing voice over IP and video-on-demand to every computer, and also because of the immense profits of it. What are some of the technical means we use to implement streaming audio and video? i digital audio is a digital representation of an audio wave that can be used to recreate it; audio waves can be converted to digital form by an Analog-to-Digital Converter (ADC) ii the data rate of sending audio over the Internet can be reduced by an order of magnitude if compression is used; one of the most popular audio compression algorithms is MPEG audio layer 3 (MP3) – it transforms the signal mathematical by a Fourier transform into its frequency components iii if a sequence of images is drawn at 50 images/second the eye does not notice they are discreet images; with video systems we exploit this principle; we represent the images in digital form by using a grid of pixels (picture elements) i ii i and ii i and iii Solution Ans: C) i and iii Explanation: digital audio is a digital representation of an audio wave that can be used to recreate it; audio waves can be converted to digital form by an Analog-to-Digital Converter (ADC) and if a sequence of images is drawn at 50 images/second the eye does not notice they are discreet images; with video systems we exploit this principle; we represent the images in digital form by using a grid of pixels (picture elements) we use to implement streaming audio and video.

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