search

mmontag / wfs-designer

Wave field synthesis spatial audio mixer
www.mattmontag.com/projects-page/wfs-designer
26 stars 3 forks source link

Amplitude distance calculation doesn't corresponding with literature #3

Closed tonetechnician closed 5 years ago

tonetechnician commented 5 years ago

Hey Matt,

Great work on this. I know I'm sort of resurrecting something from the 2014 grave here, but if you could help I'd be super appreciative!!! I have been wondering what literature you based your distance calculation for the amplitude of a nominal source?

I've read through your thesis and it seems to me that your distance and listener compensation equations for the driving signal for each speaker (from chapter 2) do not correspond with the calculation you use in your software ( \sqrt{B/(A+B)} where A=source -> loudspeaker and B = loudspeaker -> listener.

Would you be able to shed any light on why you chose to use this calculation instead of the one in the literature?

Much thanks!

mmontag commented 5 years ago

Hi,

Oh, I'm embarrassed, that code is pretty messy. See equation 33 in this paper https://pdfs.semanticscholar.org/cafe/e6d5e8a599113545bec3e297c146ee6fa091.pdf: image

The big radical term matches my gain calculation. But it's been too long, I can't remember why. Maybe I made an error.

tonetechnician commented 5 years ago

No, don't stress! Haha, masters projects are like this (I'm finishing mine currently).

I see now. Thanks so much for the source. I think the term that might be missing is the division by the square root of the distance of source to the loudspeaker i.e

image

Thanks again in any case! All the best,

Sean