True RTA analyzer software

[JAY X]

Hi All!

I'm looking for a analyzer software to test the noise/THD/bandwidth of the summing mixer i have designed. I found a software: True RTA,
https://www.trueaudio.com/rta_abt1.htm that seems good for this purpose.
I have a quite good audio interface: UMC-1820. bought recently.

¡Any comment about this software is wellcome!

¡Thank you very much!

jay x

 

[Frex]

Hello,

Here, we could highly recommend you Arta because
it's a very good software and it's free. Many DIYers on the forum use it with success.
Regards.

Frex

 

[biju55]

Are there any special circuit between the sound source and PC sound card while measuring the distortion with these software ?.

 

[Frex]

Hello,

You only must be careful to not overload the input.
If you want to measure the THD from an output of amplifier, you will
need to add a resistor divider (attenuator) to have a signal level at
input of sound card of about 1-2V max.
You must also be careful that some amplifier with BTL output can't
be connected directly because each output wire are active (no ground).

Frex

 

[Pano]

Yes, Frex is correct. Use ARTA. The free version does no allow yo to save files, but it's still very useful. You could also try REW (Room EQ Wizard). Not quite as well adapted to what you want to do, but free.

 

[skidave]

Go download the April 2016 issue of AudioXpress and there is an article all about measurement of this nature.