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WinMLS 2000 Forum

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Subject measuring time variant systems

Date Fri Jan 30 2004 08:54
Author Knut Inge Hvidsten (

Hello. I`m in the process of purchasing a personal license for home use (although I`m not shure where I would get that 8 digit code from, do I have to d/l and install the demo before paying?)

My real question would be if there is a clever way to measure time variant systems using mls or log-swept sine methods? PReferreably in such a way that time/frequency resolution can be adjusted post measurement.

My application would be getting a (large) set of IRs from a rotating speaker. One way would be disengaging the motors and manually move the speaker at constant angular intervals between each measurement. If, say, 256 measurements are needed, this would require a lot of work as compared to letting the motors run and then taking the weekend off :-)

could winmls accept a synch input (say a short audio burst/impulse at angle0) ?

Or would this be better accomplished writing a matlab application that generate a series of stepped increasing-frequency sines and measure the amplitude and phaseshift of each?

I can see this also having some relevance to measuring directivity of loudspeakers as well as some hrtf stuff?

best regards
Knut Inge Hvidsten
FFI (Norwegian Defence Research Establishment)
multimedia signal-processing, NTNU

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