Re: [Audacity-devel] New member and plans

[Martyn S. <mar...@gm...>]

Hi there!  Welcome!

On 14/12/2013 01:28, Vaughan Johnson wrote:
>
>
> On 12/13/2013 11:05 AM, David Smith wrote:
>> Greetings,
>>
>> I just joined the list and am planning on the following.
>>
>> 1.I have ported to VS 2013 and have everything running. I need to run
>> the tests that exist still.
>
> Cool. We're planning on hold off on that until it's at least a year old,
> but we do plan to move to VS2012 within months... I think we're agreed
> on that, and Leland has it working.
>
>
>>
>> 2.I am working on modifying the Plot Spectrum/Frequency Analysis window
>> to support setting a min/max frequency (within the bounds of the sampled
>> data). I am doing this to use this tool for looking at spectrum of
>> impulse response analysis on making guitars.

Measuring the impulse response of things is something that we can do 
well (I believe) with the 'Aurora' plugins, which assumes that your 
system is linear.  We don't currently ship Aurora plugs, but they 
exist as source code at
https://code.google.com/p/aurora-for-audacity/
and I have been using them to record impulse responses, and therefore 
frequency responses, for some time now (and the reverb of spaces).

My build of that is at
https://dl.dropboxusercontent.com/u/1327769/Aurora.zip
but you have to interpret the instructions into 'Audacity' for 
yourself as I have not around to writing those.  One day.

Basically it goes, for a linear system:
Impulse -> system -> impulse responses
Impulse -> filter -> system -> inverse filter -> impulse response
and Aurora generates the 'Impulse -> filter' and allows you to do the 
'inverse filter' bit.

>
> Super cool.

Indeed, and having a vertical 'zooming' capability would be great as 
well (like the Equalization effect).

>> The current tool is nice
>> but the interested range is around 40-800 hz and there is no zoom
>> capability. My choices have been to add a zoom ability (a bit of work),
>> add a couple of text edit fields with validators (current approach) and
>> a redraw button (since there is no commit I can find on changes). Any
>> suggestions would be highly welcomed.
>>
>> Do these seem to be reasonable things for me to generate patches for
>> when done and submit?
>
> Definitely.

+1.  I'm all for increasing the analytical powers of Audacity!

>>
>> As by way of background I am a software scientist for an EDA company
>> based in California and have been programming for decades. I use a lot
>> of C#, C++, C, TCL, Fortran, etc. in my work so the new piece is to pick
>> up wxWidgets (yet another GUI API). Seems pretty nice so far.
>
> We welcome your contributions!

+1

Martyn

> - Vaughan
>
>>
>> Regards
>>
>> David Smith
>
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