 Posted: Thu Jul 09, 2009 8:41 pm |
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| I was deciding what stimulus signal to use for reverberation time measurements, so I made some quick measurements in the lab with different signals to compare. The result was surprising to me. The frequency responses of sweep measurements were quite different than those using noise. The difference varied with frequency up to 10 dB at the lower end. Why is this? I was using a two-way loudspeaker, which was being compensated in the measurement. Here's a picture of my frequency responses; the upper curves are the ones using noise stimuli.
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| Posted: Wed Jul 15, 2009 4:56 pm |
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| Jim Mobley |
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| Joined: 27 Jul 2005 |
| Posts: 134 |
| Location: Foothill Ranch, California, USA |
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| Looks like you might be hitting a limiter in the amplifier. Back off the drive level of the sweeps. |
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_________________
Best regards,
Jim Mobley
Sr. Application Engineer
Renkus-Heinz, Inc.
19201 Cook St.
Foothill Ranch, CA 92610 USA
TEL: +1-949-588-9997
FAX: +1-949-588-9514
www.renkus-heinz.com
mailto:jim@renkus-heinz.com |
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