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02_CM0340_Multimedia_Data_Basics

02_CM0340_Multimedia_Data_Basics - Multimedia Data Basics...

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44 JJ II J I Back Close Multimedia Data Basics Multimedia systems/applications have to deal with the Generation of data, Manipulation of data, Storage of data, Presentation of data, and Communication of information/data Lets consider some broad implications of the above
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45 JJ II J I Back Close Discrete v Continuous Media RECALL : Our Definition of Multimedia All data must be in the form of digital information. The data may be in a variety of formats: text, graphics, images, audio, video.
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46 JJ II J I Back Close Synchronisation A majority of this data is large and the different media may need synchronisation : The data will usually have temporal relationships as an integral property. Click here or image above to run movie
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47 JJ II J I Back Close Static and Continuous Media Static or Discrete Media — Some media is time independent: Normal data, text, single images, graphics are examples. Continuous media — Time dependent Media: Video, animation and audio are examples.
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48 JJ II J I Back Close Analog and Digital Signals Some basic definitions – Studied HERE Overviewing of technology — Studied HERE More in depth study later.
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49 JJ II J I Back Close Analog and Digital Signal Conversion The world we sense is full of analog signals: Electrical sensors convert the medium they sense into electrical signals E.g. transducers, thermocouples, microphones. (usually) continuous signals Analog : continuous signals must be converted or digitised for computer processing. Digital : discrete digital signals that computer can readily deal with.
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50 JJ II J I Back Close Analog-to-Digital Converter (ADC) Special hardware devices : Analog-to-Digital converters Take analog signals from analog sensor ( e.g. microphone) and digitally sample data ( More details later )
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51 JJ II J I Back Close Digital-to-Analog Converter (DAC)
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