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Log Sine Sweep
PostPosted: Sun Dec 13, 2015 7:18 pm Reply with quote
cekcim
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Joined: 07 Sep 2015
Posts: 11
Location: Germany




Hello there,

Can someone kindly enlighten me as to what deconvolution technique is used in EASERA to obtain the IR from the logarithmic sine sweep?

Thanks
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PostPosted: Mon Jan 04, 2016 11:01 am Reply with quote
AFMG Pedro Lima
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Joined: 05 Jun 2010
Posts: 233
Location: Brazil




Hi cekcim,

The algorithm is basically:
- Capture the signal in the time domain;
- Window signal corners to avoid spectral leakage due to the FFT;
- Go to the frequency domain (FFT);
- Apply deconvolution in the frequency domain with stimulus signal;
- Go back to the time domain (iFFT) > IR.

Regards,
Pedro Lima
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PostPosted: Tue Jan 12, 2016 10:01 am Reply with quote
cekcim
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Joined: 07 Sep 2015
Posts: 11
Location: Germany




Thank you very much Pedro.

May I ask another question on a different topic please, regarding the calculation of the EDT?

Does the EDT calculation follow the IEC definition (which ignores the direct sound) or is it based on Jordan's original definition of EDT, i.e. taking the first 10dB of decay of the backward integration?

Thanks again
Regards
Bernard
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PostPosted: Wed Jan 13, 2016 9:42 am Reply with quote
Waldemar
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Joined: 05 Dec 2005
Posts: 105




Hi,
we use the EN ISO 3320. It defines the EDT as decay over the first 10 dB.

_________________
Best Regards
SDA, Waldemar Richert
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PostPosted: Wed Jan 13, 2016 10:06 am Reply with quote
cekcim
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Joined: 07 Sep 2015
Posts: 11
Location: Germany




Thank you very much Waldemar!
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Log Sine Sweep
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