[audacity4blind] Re: high shelf filter
- From: Robert Hänggi <aarjay.robert@xxxxxxxxx>
- To: audacity4blind@xxxxxxxxxxxxx
- Date: Fri, 30 May 2014 00:28:04 +0200
Hi Brad
I'm currently writing a plug-in that measures the threshold of hearing
and might be of use to you (at least if you're on Windows).
It's more accurate than a simple high-shelf filter because it uses the
Audacity EQ bands.
It works like this:
Each plug-in call plays a specific frequency with ascending volume (3
dB per second).
The user presses space as soon as he hears a tone. This value will be
stored and Ctrl-R plays the next sequence.
After all bands, the result is stored and can be imported as a XML
file into the Equalizer effect.
The resulting curve makes that you hear all frequencies equally loud.
Inverting the curve will attenuate frequencies where your hearing is
weak and does therefore simulate your hearing experience for others.
However, the test persons should actually take their profile too, or
the filtered audio will not sound quite the same, i.e. it will
probably be too strong.
Although the concept is very easy, the programming is really hard due
to the Nyquist limitations. Nevertheless, the main code runs and I
hope to finish it by the end of the week. You and all other
subscribers are welcomed to test it.
Best regards
Robert
The audacity4blind web site is at
//www.freelists.org/webpage/audacity4blind
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