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  1. 1. Audio Formats and Data compression<br />Kyle Laurin<br />
  2. 2. Introduction<br />
  3. 3. Acoustic recording<br />The Phonograph Cylinder<br /><ul><li>Initial Phonograph cost: $150
  4. 4. Equal to about $3500s today
  5. 5. Initial Cylinder cost: 50 cents
  6. 6. Equal to about $18s today
  7. 7. Playback time: 2 minutes
  8. 8. WATCH</li></li></ul><li>The gramophone<br />The Birth of Records aka “Vinyl”<br /><ul><li>Triumphed over the phonograph cylinder as the ideal audio storage format
  9. 9. Dominated the audio industry for most of the 20th century</li></li></ul><li>Electrical Recording<br />Microphone<br />Vacuum Tube Amplifier<br />WATCH<br />Loud Speaker<br />
  10. 10. Tape<br />Stereophonic Recording<br />8 Track Tape<br />Cassette Tape<br /><ul><li>Multi Track Recording</li></li></ul><li>Compact Discs<br /><ul><li>Much Smaller than Vinyl records
  11. 11. 74 minutes of playing time (vs 20 minutes for long playing vinyl records)
  12. 12. Can reproduce the highest of digital audio quality</li></li></ul><li>Audio Audio Compression / mp3s<br /><ul><li>Effectively erases data to reduce file size
  13. 13. Mp3 encoded files can be up to 11 times smaller than .wav files found on cds
  14. 14. As a result of this compression in file size, the audio quality is reduced</li></li></ul><li>Mp3 vs .wav<br /><ul><li>they Duke it Out</li></li></ul><li>Conclusion<br /><ul><li>What are the possible repercussions of this degradation in audio quality?
  15. 15. Consider headphones.
  16. 16. The future of audio compression
  17. 17. Lossless compression methods</li>