CS101.Lect16.Audio.Intro

CS101.Lect16.Audio.Intro - CS101 Lecture 16 Audio Encoding...

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Computer Science CS101 Lecture 16: Audio Encoding Sampling Quantizing Aaron Stevens ([email protected] ) with special guest Wayne Snyder ([email protected]) 18 October 2011 Computer Science 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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Computer Science 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. Computer Science 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 given pitch are called harmonics. Human hearing is generally in the range of 20Hz - 20,000Hz. Computer Science 6 Microphones and Speakers Microphones convert acoustical energy (sound waves) into electrical energy (the audio signal). Speakers do the same thing in
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CS101.Lect16.Audio.Intro - CS101 Lecture 16 Audio Encoding...

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