1. Audio Filter Project Neil E. Cotter Associate Professor (Lecturer) ECE Department University of Utah CONCEPT U AL TOOLS

2. Overview Goal: Build filter to pass low or high frequencies in audio signal Equivalent to bass/treble controls on MP3 player CONCEPT U AL TOOLS http://www.ebay.com/bhp/f3-cellphone-watch http://news-releases.theurbanmusicscene.com/2009/01/27/ pedro-giraudo-jazz-orchestra--el-viaje.aspx http://www.guardian.co.uk/music/blog/2009/ dec/21/jazz-purist-found-wynton-marsalis http://salestores.com/gegsdu153w60.html http://www.thatcable.com/category/ 6-35mm-(1-4inch)-Plug-to-Plug/sub

3. Overview Goal: Build filter to pass low or high frequencies in audio signal Equivalent to bass/treble controls on MP3 player Each group of students will design/build low-pass filter (more bass) or high-pass filter (more treble) CONCEPT U AL TOOLS

4. Overview Goal: Build filter to pass low or high frequencies in audio signal Equivalent to bass/treble controls on MP3 player Each group of students will design/build low-pass filter (more bass) or high-pass filter (more treble) Theory first: Sound waves = sums of sinusoids (Fourier theory) Complex numbers can represent sinusoids (Phasors) Electronic components alter sinusoids— resistors, inductors, capacitors Filter design = sinusoid analysis (circuit theory) CONCEPT U AL TOOLS