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Modulated speech as referens/Stimilus signa
PostPosted: Thu Sep 08, 2005 9:50 am Reply with quote
datrobban
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Joined: 29 Apr 2005
Posts: 17
Location: Sweden




Hi!

I want to measure Rasti/STI on a Voice evacuation alarm system through the fire mans alarm mic by using a cd containing modulated speech.
Is it possible to use this modulated speech as refernce/stimilus signal to measure the rasti value?

I cant use the original stimilus from easera since the voice system doesn't have a signal/line input for this.

thanks for any info

best regards
Robert Nilsson
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PostPosted: Sun Sep 11, 2005 10:29 am Reply with quote
Stefan
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Joined: 19 Apr 2005
Posts: 167
Location: Berlin, Germany




Hi Robert,

at present this is not possible directly. However, if you have the signal in a wave format, you could just record the voice system output. Afterwards loads this file into EASERA as well as the stimulus file and divide one by the other in the frequency domain (deconvolution).

That will remove the signal from the recording and give you an impulse response. In EASERA you can calculate STI, RaSTI and equiv. STIPa from this IR.

Stefan
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PostPosted: Mon Sep 12, 2005 1:39 pm Reply with quote
datrobban
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Joined: 29 Apr 2005
Posts: 17
Location: Sweden




Hi Stefan!

Thanks for your information, I'll try that and see how well it performes for me.

Best regards
Robert Nilsson
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