02_CM0340_Multimedia_Data_Basics

02_CM0340_Multimedia_Data_Basics - 44 JJ II J I Back Close...

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Unformatted text preview: 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 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. 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 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. 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. 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. 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 ) 51 JJ II J I Back Close Digital-to-Analog Converter (DAC) Playback a converse operation to...
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This note was uploaded on 01/26/2012 for the course CM 0340 taught by Professor Davidmarshall during the Fall '09 term at Cardiff University.

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02_CM0340_Multimedia_Data_Basics - 44 JJ II J I Back Close...

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