Question on measurements

[Leo11]

I would like to maximize the quality of my measurements by average over multiple acquisitions, in order to minimize noise interference etc.
Is there a way to do this with Audiolense?

In addition, can microphone phase calibration be used in Audiolense or is it left out?

 

[JM1]

Yes, mic phase is used if in the cal files.
What interface are you using? If using a USB mic, switching to an interface that provides precise time alignment between sweep and microphone capture might be something you would want to implement. If your delays are not rock solid with repeat measurements, that needs to be corrected. If you are using a USB mic, plug it directly into a port on the computer, hubs can cause timing problems.
Have you tried looking at your SNR? REW is an easy way to do that. I find that with a 20 second sweep at about 85 dB, noise is no issue in my environment.
It's good that you are looking into this, good measurements are mandatory for good filters.

 

[juicehifi]

No it is not possible to average several measurements like that. You will achieve the same if you increase the length of the sweep. But my experienc is that the upside of this is only theoretical. I never use more than 10 s sweeps, and some users prefer 3 s.

Microphones are minimum phase devices, so the phase info is not used, but calculated from the magnitude info.

 

[Leo11]

Thanks for your answers.

Considering the calibration uncertainty of the microphones (usually bigger than deviation), as well as the unknown of the calibration field (diffuse, free, etc.), does it make sense to estimate the phase as a minimum phase system?

Making longer sweeps is something that I have considered, however longer duration means greater chance of catching unwanted noises in my environment (city).
If I used the multiseat correction option by loading multiple measurements of the same point, would I get the same result?
Out of curiosity, does the multiseat correction also take into account the phase of the loaded measurements or only magnitude?