[Rwp] Accessible spectrum analyser
Chris Belle
cb1963 at sbcglobal.net
Thu Mar 3 03:08:17 EST 2016
Well, the last point could be done by a time selection in your daw,
and the table set to generate till the daw stops or something like that.
Like a timed run of a specific portion.
leave it to your brilliant mind to analyze and break all this down
I like that table thing,
and being able to change the resolution of what is analyzed would be great.
I'm going to persevere with the current implementation and see what I
can do with it.
This is the first tool of it's kind I believe,
we've had audio meters in hardware before, but it's nice now that the
software ones are finally coming around to reality instead of just concept.
I'm not a programmer, but in theory it shouldn't be hard to generate
some kind of values which can be tied to text out-put,
we'll never have it s good as being able to look at a graph, but it
should be possible to link up something useful can you imagine as a
programming guy how this might be done?
YOu and this fellow would make a formidable programming team I bet.
'grin'.
On 3/2/2016 2:20 PM, Snowman wrote:
> 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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