[sdiy] VCA signal analysis

[Terry Shultz]

Hi Rutger,

I will send over some more tool links:

http://www.trueaudio.com

http://www.vintagetek.org/zencart/

http://www.circuitsage.com/tools

http://www.hpw-works.com

http://www.signalwizardsystems.com/page4.html

http://audio.rightmark.org/products/rm3ds.shtml

http://www.saelig.com/DA/DA004.htm

http://www.studiosixdigital.com/audiotools/

http://www.artalabs.hr/index.htm

I hope some of this is useful. I have tried most of these tools and I have used the Signal Wizard some and it works quite well.

Not all versions are free but most are reasonable in cost for the function.

Best regards,

Terry


On Jan 11, 2014, at 3:11 AM, Rutger Vlek <rutgervlek at gmail.com> wrote:

> Hi Terry,
> 
> Visual Analyzer looks good! As an alternative, I found Right Mark Audio Analyser through google http://audio.rightmark.org/products/rmaa.shtml.
> 
> Combined with my MOTU 828mk3 this is probably sufficient for the measurements I need to do, except... the output range of the MOTU is limited to about -4 to +4 volts, while I'd prefer to test the full range of 10V p.p. (-5 to +5 volts) common in modular synths (I'd also like to measure headroom to the point of 1% distortion). I could design a step-up and step-down opamp circuit to expand the range, but then I'd be measuring characteristics of that circuit too.... Has anyone run into similar problems?
> 
> Rutger
> 
> 
> On 10 dec 2013, at 09:37, thx1138 wrote:
> 
>> Hi all,
>> 
>> Visual Analyzer is Free and is quite a good tool from Sillanumsoft on web.
>> 
>> I use it with my PC Laptop and M-Audio box.
>> 
>> It seems to work fine from my MacBook Pro under Fusion v. 6 and Win 7.
>> 
>> I also have an Audio Precision , but it is a bear to drag around for mobile projects.
>> 
>> best regards,
>> 
>> Terry p.s. I am in Erfurt Germany all week Damien.
>> 
>> Tchuss!
>> On 12/9/2013 5:52 AM, Neil Johnson wrote:
>>> Hi,
>>> 
>>> cheater00 wrote:
>>>> [HP8903B]...and with 70 dB dynamic range perfect for testing the fidelity of
>>>> transatlantic phone lines :-)
>>> A rough hand-wavey estimate: at the top end the maximum input is 300V,
>>> at the bottom end the residual noise and distortion (20Hz - 20kHz,
>>> 80kHz BW) is 15uV (all datasheet numbers - I haven't had mine
>>> calibrated yet so I can't give you cal.cert numbers), giving a dynamic
>>> range of about 146dB.
>>> 
>>> For my purposes (messing around with old mixers and old analogue
>>> synths, and designing synth modules) it's good enough.  If you want
>>> more than that then you really need to step up to an AP.  I think Paul
>>> Schreiber has (or had) one.
>>> 
>>> A notch filter also allows you to spend your limited sensitivity and
>>> resolution on exploring distortion artefacts.  You can pump a healthy
>>> signal into your circuit (VCA, filter, telephone line, etc), notch out
>>> the fundamental, and then turn the gain up so you can see the all the
>>> annoying harmonics from the distortion mechanisms in the circuit.
>>> 
>>> Neil
>>> --
>>> http://www.njohnson.co.uk
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>> 
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>