swept sine accuracy ("James W. Beauchamp" )


Subject: swept sine accuracy
From:    "James W. Beauchamp"  <jwbeauch@xxxxxxxx>
Date:    Thu, 5 Mar 2009 19:13:51 -0600
List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>

Guys, This is a not strictly an auditory question, but it could be useful for people doing acoustic measurements. If you use a swept sine wave to measure the frequency response of a linear system, what is the limitation on the speed of the sweep in terms of how accurate the result would be? I imagine it has something to do with how smooth the actual frequency response is. If it has some pronounced bumps, they could be smoothed out if the sweep is too fast. In practice, you could sweep at some arbitrary rate, and then slow it by a factor of two, and if the result is the same (within an acceptable tolerance) you could say that you've converged on the solution. But I'd like to have a theoretical result. Jim Beauchamp Univ. of Illinois at Urbana-Champaign


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