[Rwp] Accessible spectrum analyser

Wed Mar 2 15:20:22 EST 2016

Well, here are my thoughts about this, for what it's worth.
I find myself less able to make use of a real-time, dynamic audible output 
like this, especially while I'm also hearing the audio itself. But, also in 
general.
To be honest,  I wish this tool could generate a spectrum report, which 
would be a table of  numbers describing a curve, showing how much peak, and 
average energy is in each frequency band, so you could study it, and learn 
where the peaks really reside.
A constantly changing tone output has time delays associated with it, as you 
are aanalyzing the selection in real time.  So, yeah, it takes a bit of 
concentration, especially for a partially tone deaf person, like me.  I 
know, Not a musician any more.  But, I still do audio production.
If the tool would let me specify a bin size, maybe in hertz, or in octives, 
and the start and end frequencies of the spectrum I want to check out, much 
as it does now, except for the addition of the bin size.  And then, produce 
a table of amplitudes, which generally show how much energy is in each bin, 
then I could understand what is actually going on.
As it is, you have to violate the threshold before you get any indication 
that some coloration still exists.
So, for example, I would specify start frequency, then width, or end 
frequency, and then bin size.
So, Maybe I watch the area between 1k and 11khz, for a 10K total span, and I 
specify 100 hz bin size. so we divide the 10k span by the 0.1khz bin size, 
and then we generate 100 values.  The first value represents the amount of 
energy in the span from 1k to 1.1khz.  By inspecting that table, manually, 
or witt computerized aid, I can find out which bin has the most energy, even 
if it did not violate any threshold.  From that, I can rather precisely tell 
where I am sharp.

The last thin is to somehow identify the portion of a track, or file, that 
should be analyzed.

Anyway, that is what I hope for.  More of a static analysis tool, instead of 
a real-time dynamic tool.

I don't claim that the current implementation doesn't have value.  I think 
it does.  I just wish for this additional static data output.

----- Original Message ----- 
From: "Chris Belle" <cb1963 at sbcglobal.net>
To: "Reapers Without Peepers" <rwp at bluegrasspals.com>
Sent: Wednesday, March 02, 2016 7:28 AM
Subject: Re: [Rwp] Accessible spectrum analyser

>I think there's some slight errors in the documentation,
> you said left when you meant right,
> or maybe I don't understand correctly, but
> the way I grasp it is that the tone goes up in pitch as the volume of the 
> peak goes up, and the position of the sound in the
> pan field changes with frequency, the higher the frequency the further to 
> the right it is, and lower the frequency it goes to the left.
> Is that right?
>
> And you can select the starting point, and the band width of the frequency 
> range that is being tested.
> I'm curious,
> can the beeps be separated from the sound of the audio your testing?
> Right now the audio jumps around in the pan field as well, and that is 
> rather disconcerting if you are trying to listen to it,
> and find a hot frequency spot as well as hearing the beeps.
> So if it's possible to unlink the audio and the beeps it might be easier 
> to work with.
> Just a thought, it may not bother others.
> Thanks for working so hard on this.
>
>
> On 3/2/2016 6:40 AM, Fiore Martin wrote:
>>
>>
>> 2016-03-02 10:49 GMT+00:00 Chris Belle <cb1963 at sbcglobal.net 
>> <mailto:cb1963 at sbcglobal.net>>:
>>
>>     Hey this is wonderful.
>>
>>
>> Thanks!
>>
>>     You're the guy who also developed the accessible peak meter thing
>>     too right?
>>
>>
>> That's right. In fact the spectrum analyser came from the idea of using 
>> the accessible peak meter's very sonification into the frequency domain.
>>
>>
>>     If you guys haven't gotten that tool, it's really useful as well.
>>
>>
>>     On 3/1/2016 9:44 AM, Fiore Martin wrote:
>>
>>         Hi all,
>>         just to let you know the Accessible Spectrum Analyser VST/AU
>>         plug-in is now available online for free at
>>         http://depic.eecs.qmul.ac.uk/apm/spectrum.html
>>
>>         Accessible Spectrum Analyser makes spectrograms accessible
>>         using non speech sound  to supports core activities in audio
>>         production.
>>         The plug-in was developed as part of our research on
>>         accessibility and cross modal collaboration at Centre for
>>         Digital Music, Queen Mary University of London.
>>
>>         More info on the web page linked above
>>
>>         thank you
>>         all the best
>>         Fiore Martin
>>
>>
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