Alice Workshop Working with Sound
Sound <ul><li>Working with sound is appealing to students </li></ul><ul><li>Demo:  Penguin Sound </li></ul>
Opportunity <ul><li>Using sound offers an opportunity to discuss fair use and copyright guidelines. </li></ul><ul><li>For ...
Questions <ul><li>Questions students ask: </li></ul><ul><ul><li>Can more than 1 clip (from different sound files) be used?...
Sound editor <ul><li>Alice is not, nor has, a sound editor.  </li></ul><ul><li>Obtain sound editor software </li></ul><ul>...
Soundcards <ul><li>Audacity works with OS </li></ul><ul><ul><li>Capturing sounds to a file </li></ul></ul><ul><ul><li>Edit...
Digital Sound Digital wave form Each dot in the figure above represents one audio  sample .
Sample Rate <ul><li>The rate at which the samples are captured, measured in Hertz (Hz), or samples per second.  </li></ul>...
Sample Size <ul><li>Essentially this is the number of digits in the digital representation of each sample. </li></ul><ul><...
File Formats <ul><li>Uncompressed (Pulse Code Modulation) </li></ul><ul><ul><li>Each number in the file corresponds to one...
Launch Audacity Original Song Clip from Song
Penguin Sound <ul><li>Has a 3+ minute sound track </li></ul><ul><li>Modify to use a 30 second clip repeatedly </li></ul>
Skate Routine <ul><li>SkateRoutine </li></ul><ul><ul><li>Grab a 30 second clip from a song </li></ul></ul><ul><ul><li>Impo...
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3 workingwithsoundaudacity

  1. 1. Alice Workshop Working with Sound
  2. 2. Sound <ul><li>Working with sound is appealing to students </li></ul><ul><li>Demo: Penguin Sound </li></ul>
  3. 3. Opportunity <ul><li>Using sound offers an opportunity to discuss fair use and copyright guidelines. </li></ul><ul><li>For educational purposes, fair use and copyright guidelines rule of thumb is 30 seconds*. </li></ul><ul><li>http://www.utsystem.edu/ogc/INTELLECTUALPROPERTY/ccmcguid.htm </li></ul>* Or 10%, whichever is less
  4. 4. Questions <ul><li>Questions students ask: </li></ul><ul><ul><li>Can more than 1 clip (from different sound files) be used? Yes </li></ul></ul><ul><ul><li>Can a 30 second clip be played again and again? Yes </li></ul></ul><ul><ul><li>How to get a 30 second sound clip? </li></ul></ul>
  5. 5. Sound editor <ul><li>Alice is not, nor has, a sound editor. </li></ul><ul><li>Obtain sound editor software </li></ul><ul><ul><li>Example : Audacity </li></ul></ul><ul><ul><li>Freeware from audacity.sourceforge.net /download/ </li></ul></ul>
  6. 6. Soundcards <ul><li>Audacity works with OS </li></ul><ul><ul><li>Capturing sounds to a file </li></ul></ul><ul><ul><li>Editing files </li></ul></ul><ul><ul><li>Mixing different tracks </li></ul></ul><ul><li>OS of the computer uses a soundcard to </li></ul><ul><ul><li>Convert analog sound (from a CD) to digital format when recording, and </li></ul></ul><ul><ul><li>Convert digital sound file to analog sound, when playing audio </li></ul></ul>
  7. 7. Digital Sound Digital wave form Each dot in the figure above represents one audio sample .
  8. 8. Sample Rate <ul><li>The rate at which the samples are captured, measured in Hertz (Hz), or samples per second. </li></ul><ul><ul><li>For Alice clips we will use a sample rate of 22.5 KHz </li></ul></ul><ul><li>Higher sampling rates allow a digital recording of higher quality. </li></ul>
  9. 9. Sample Size <ul><li>Essentially this is the number of digits in the digital representation of each sample. </li></ul><ul><ul><li>Think of the sample rate as the horizontal precision of the digital waveform, and the sample size as the vertical precision. </li></ul></ul><ul><li>Higher sample sizes allow for more dynamic range - louder louds and softer softs </li></ul>
  10. 10. File Formats <ul><li>Uncompressed (Pulse Code Modulation) </li></ul><ul><ul><li>Each number in the file corresponds to one sample </li></ul></ul><ul><ul><li>Audacity supports WAV, AIFF, and others </li></ul></ul><ul><li>Compressed </li></ul><ul><ul><li>Logarithmic encodings </li></ul></ul><ul><ul><li>Audacity supports MP3 and Ogg Vorbis </li></ul></ul><ul><ul><li>Not WMA and MPEG4 (AAU) </li></ul></ul><ul><li>Alice supports WAV and MP3 </li></ul>
  11. 11. Launch Audacity Original Song Clip from Song
  12. 12. Penguin Sound <ul><li>Has a 3+ minute sound track </li></ul><ul><li>Modify to use a 30 second clip repeatedly </li></ul>
  13. 13. Skate Routine <ul><li>SkateRoutine </li></ul><ul><ul><li>Grab a 30 second clip from a song </li></ul></ul><ul><ul><li>Import it into an existing world </li></ul></ul><ul><ul><li>Add it to the skating routine </li></ul></ul>

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