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Forum index » Science and Technology » Physics » Acoustics
EASE and RASTI
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Tony177
science forum Guru Wannabe


Joined: 07 Sep 2005
Posts: 111

PostPosted: Tue Nov 29, 2005 7:25 pm    Post subject: EASE and RASTI Reply with quote

I've had some predictions of sound reinforcement performance done with EASE,
which include RASTI predictions. I am a bit mysitifed as the RASTI comes
in three different flavours, decribed as 3 octave analyses centred on 500,
1000 and 2000 Hz. To my understanding, STI and RASTI should be single
figure measures of a system. I think maybe what is happening here is that
some other measure is being taken and converted to RASTI via a formula. But
the figures for different frequency ranges are not identical and they can't
all be right.

I have also seen a paper from the AES 2002 conference in St. Petersburg, by
Ahnert, Feistel and Schmitz, on this very subject of EASE and RASTI, but
that doesn't help me as it also includes graphs showing both RASTI and STI
varying with frequency, without very clear explanation of the derivation.
Can anyone who uses EASE throw any light on this?

--
Tony Woolf
My e-mail address has no hyphen
- but please don't use it, reply to the group.
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Tom Harper
science forum beginner


Joined: 09 Jul 2005
Posts: 16

PostPosted: Wed Nov 30, 2005 1:12 am    Post subject: Re: EASE and RASTI Reply with quote

Tony

I have a copy of the EASE 4.0 manual (Ease 4.1 Users Manual
By Acoustic Design Ahnert, Berlin.) that I pickup at a recent training
seminar. "Appendix A - Acoustic Formulae" of this document outlines all
of the formula used in EASE including the STI and RASTI calcs.

I can't find this manual on the website for download so I suspect that
you have to go to the training course to get it or buy it directly from
ADA. If you need I could print out the relevant pages and e-mail them
to you. But the whole manual is pretty good and worth getting if you
could buy it from ADA.

Tom Harper
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Bruce
science forum beginner


Joined: 07 May 2006
Posts: 4

PostPosted: Sun May 07, 2006 5:07 am    Post subject: Re: EASE and RASTI Reply with quote

Tony wrote:
I've had some predictions of sound reinforcement performance done with EASE,
which include RASTI predictions. I am a bit mysitifed as the RASTI comes
in three different flavours, decribed as 3 octave analyses centred on 500,
1000 and 2000 Hz.

...

Can anyone who uses EASE throw any light on this?


Hi Tony,

I know this is an old question, but I've just joined the forum.

In EASE Standard mapping, RASTI is computed using a curve-fit equation from a prediction of %ALCons. As %ALCons is calculated using the Hopkins-Stryker form of equations using statistical measures there can be significant variations from real world spaces where these equations are problematic.

A better calculation of STI using the MTF calculated using the Analysis Utility for Room Acoustics (AURA) module from a predicted Room Impulse Response is the preferred method.

There is an EASE specific forum at SDA Network that you may want to check out.
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Bruce
science forum beginner


Joined: 07 May 2006
Posts: 4

PostPosted: Sun May 07, 2006 5:14 am    Post subject: Re: EASE and RASTI Reply with quote

Tom Harper wrote:
I have a copy of the EASE 4.0 manual (Ease 4.1 Users Manual
By Acoustic Design Ahnert, Berlin.) that I pickup at a recent training
seminar. "Appendix A - Acoustic Formulae" of this document outlines all
of the formula used in EASE including the STI and RASTI calcs.


That Appendix is actually from Chapter 6 in "Handbook for Sound Engineers" by Glen Ballou written by Dr. Wolfgang Ahnert.
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