[sdiy] VCA signal analysis

[thx1138]

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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>