CS101.Lect19.Audio.Intro.ppt

CS101.Lect19.Audio.Intro.ppt - CS101 Lecture 19: Digital...

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1 Aaron Stevens with special guest Wayne Snyder 26 October 2010 Some images from www. mediacollege .com , Wikipedia. CS101 Lecture 19: Digital Audio 2 What You’ll Learn Today – How do we “hear” sounds? – How can audio information (sounds) be stored on a computer? – How to reproduce the sounds from the binary data?
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3 Hearing We “hear” sound when a series of air compressions vibrate a membrane in our ear. The inner ear sends signals to our brain. The rate of this vibration is measured in Hertz, and the human ear can hear sounds in the range of roughly 20Hz - 20KHz. 4 Sound Wave Properties Wavelength: distance between waves (affects pitch -- high or low sounds) Amplitude: strength of power of waves (volume) Frequency: the number of times a wave occurs in a second.
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Music Concepts Pitch refers to the human perception of sounds as musical notes. – Example: the note “A” above middle “C” on a piano has a frequency of 440 Hz. – The sounds at frequencies which are multiples of a
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CS101.Lect19.Audio.Intro.ppt - CS101 Lecture 19: Digital...

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