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Unformatted text preview: 7/19/2011 1 Lecture 2: Audio Lecture 2: Audio Foundations, Studio Skills Foundations, Studio Skills and Creating Content and Creating Content SIT253 SIT253 Audio and Visual Games Audio and Visual Games Elements Elements Sophie McKenzie School of Information Technology Faculty of Science and Technology Trimester 2, 2011 Last Week Covered in last weeks lecture: Introduction Representation Introduction Covered in this weeks lecture: Audio Foundation: Physics of audio Recording / Editing / Mixing Audio delivery formats and compression Terminology History and Game Audio Evolution of game music Type of music in computer games Adaptive and interactive audio SFX, sound design, and Foley Audio for different Game Genres Creation Tools, Toolkits and Middleware Audio Production Readings Cancellaro, Joseph (2005): Exploring Sound Design for Interactive Media. Thomson Delmar Learning. ISBN 978 1401881023 Chapter 1 3 Locked and Loaded: Crafting the Sounds for HALO 3 by Locked and Loaded: Crafting the Sounds for HALO 3 , by Robert Hanson http://mixonline.com/recording/applications/audio_locke d_loaded/ Subtlety and Silence: Creating sound for Games http://www.zero g.co.uk/index.cfm?articleid=722 Physics of Audio What is sound? Sound is a vibration, as perceived by the sense of hearing Actually is an alternation of: Actually is an alternation of: Pressure Particle displacement Particle velocity But we will stick with the simpler definition that sound is produced by vibrating matter Physics of Audio Sound energy is a form of kinetic energy that travels in waves Sound waves are longitudinal waves longitudinal wave: the molecules of the wave travel in the same direction of motion as the wave moves As sound (longitudinal) waves travel through a medium, the molecules of the medium are alternately closer together and farther apart then when in the rest position 7/19/2011 2 Physics of Audio Simple representation of sound can be done in a graph, eg., a Sine wave: Physics of Audio Wavelength the distance between two adjacent waves As the frequency of a sound increases, the shorter its wavelength becomes its wavelength becomes Amplitude the height of a sound wave The greater the amplitude of a sound wave, the louder the sound produced by that wave is Physics of Audio Frequencythe number of wave vibrations that pass a point in one second The faster the source of a sound vibrates, the greater the frequency of the waves it produces greater the frequency of the waves it produces Sound waves of different frequencies have different pitches The greater the frequency of a sound wave, the greater its pitch Measured in Hertzor Hz (cycles per second) Physics of Audio Compression representation of the Sine wave: Physics of Audio Sine Wave (tone) 440 Hz Physics of Audio Complex Sound (stereo) 7/19/2011...
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This note was uploaded on 10/03/2011 for the course SIT 253 taught by Professor Nothing during the Three '11 term at Deakin.
- Three '11