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pht

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Reply with quote  #1 

Greetings All:

 

Forgive the noobie question as I missed the latest TEF training class, which I gather was a great success!  8=>

 

Siegfried Linkwitz (one of my heroes!) advocates the use of shaped envelope, multi-tone bursts (AM modulated with cosine function) to gather definitive characteristics about loudspeakers.

 

He uses an arbitrary waveform generator to produce the stimulus, presumably captured with a digital storage oscilliscope.

 

I am not asking the TEF to create the tone bursts but is there any way to use the TEF to capture the result of the stimulus for analysis?

 

(Don't have a storage scope)

 

The PPS software package appears to be capable of munging the data once captured (I hope!) but, other than the RTA software, I don't know how to make the TEF just listen and capture whatever acoustic events are happening at its inputs.

 

If the RTA module can do this, can capture the result of multi-tone bursts in ETC-mode or the time-domain, please enlighten me!

 

Thanks in advance for your attention.


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=>><<=robert
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Charlie

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Reply with quote  #2 

Robert,

I haven't played with the Linkwitz multi-tone bursts.  I have used 1/3 oct. shaped tone bursts to characterize the max. SPL capabilities of loudspeakers.  The RTA function works well for this.  Just look at the level of the harmonics compared to the level of the fundamental.

 

I have also used the FFT function to capture the continuous (steady state) output of a loudspeaker to multi-tone stimulus.  This was done to investigate spectral contamination of loudspeakers.  I did this years ago with the TEF 20.

 

While I don't have a TEF 25, it may be possible to do either of these as well as what you are attempting by recording the output of a loudspeaker as a WAV file and analysing it with the TEF PPS module.


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Charlie Hughes
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