Subject: Re: swept sine accuracy From: Christian Borss <christian.borss@xxxxxxxx> Date: Fri, 6 Mar 2009 10:01:07 +0100 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>Am 05. Mär. 2009 um 19:13 Uhr schrieb James W. Beauchamp: >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. According to @xxxxxxxx{poletti88linearly, author = {{M. A. Poletti}}, title = {{Linearly Swept Frequency Measurements, Time-Delay Spectrometry, and the Wigner Distribution}}, journal = {J. Audio Eng. Soc.}, year = {1988}, volume = {36}, number = {6}, pages = {457-468} } the sweep rate k [Hz/s] of a linearly swept measurement should satisfy the constraint k << 1 / (pi * t^2) where t is the length of the impulse response. Ciao, Christian -- Christian Borß, Dipl.-Ing. || Institut für Kommunikationsakustik http://www.ika.ruhr-uni-bochum.de || Ruhr-Universität Bochum Tel.: +49-(0)234-32-22470 || Universitätsstr. 150, IC1/33 Fax.: +49-(0)234-32-14165 || D-44780 Bochum (Germany)