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Testing the Sound Card: Task Three

You will now measure the noise level of the sound card, and its DC offset. Follow these steps:

  1. Close the previous patch 001.pd.
  2. Stop the CD player, and disconnect its audio lead from the computer, at the computer end.
  3. Download the next PureData patch 002.pd, and open it in PureData.
  4. The sound card is now acquiring a null signal.
  5. Note the displayed values of noise level and DC offset on your log sheet.

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Download soundcard_test.pdf
``PC Sound System Test Instructions'', by Sten Ternstrom and Ryan J. Cassidy,
REALSIMPLE Project — work supported by the Wallenberg Global Learning Network .
Released 2008-06-05 under the Creative Commons License (Attribution 2.5), by Sten Ternstrom and Ryan J. Cassidy
Center for Computer Research in Music and Acoustics (CCRMA),   Stanford University
CCRMA