CS101.Lect20.Audio.Compression

CS101.Lect20.Audio.Compression - CS101 Lecture 20 Digital...

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1 Aaron Stevens with special guest Wayne Snyder 28 October 2010 Some images from www.mediacollege.com , Wikipedia. CS101 Lecture 20: Digital Audio: Compression & MIDI 2 Addendum to last time….
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3 What You’ll Learn Today – How does compact disc audio work? – What is mp3, and how does it work? – Computer generated music sounds 4 Representing Audio Information History of Sony’s music technology: http://www.youtube.com/watch?v=V5I41PdAK0Y (6 minutes) • part 1: walkman, headphones invented • part 2: digital audio: compact disc replaces vinyl and magnetic tape
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5 CD Audio http://static.howstuffworks.com/flash/cd-read.swf http://electronics.howstuffworks.com/cd.htm A CD player reading binary information 6 Representing Audio Information Compact Disc audio is encoded by sampling: – 44,100 samples per second – 16 bits per sample per channel (2 channels) – thus: 44,100 * 16 * 2 = 1,411,200 bps – Or about 10,600,000 bytes per minute CD Audio uses about 10 megabytes per minute of audio.
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Sampling, Bitrate, Quality 8 Digital Audio Formats
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