search

hbitter / DNMS

Digital Noise Measurement Sensor
https://hbitter.github.io/DNMS/
GNU General Public License v3.0
70 stars 23 forks source link

No negative dB correction possible? #54

Closed pe0ter closed 6 months ago

pe0ter commented 7 months ago

Today we tested one of my ICS4-43434 microphones and one of my IM72D128 microphones using a B&K calibration unit at 94dB. Results were a +1.6dB correction requirement for the ICS43434 unit and a -0.7dB correction for the IM72D128 unit. Entering the +1.6dB correction on the ICS43434 unit worked great but entering a -0.7dB on the IM72D128 resulted in a +0.7dB correction. Could it be the error correction formula can not handle negative correction values?

hbitter commented 7 months ago

Hi pe0ter,

I will check and come back. It may take some days.

Regards,

Helmut

hbitter commented 7 months ago

Hi pe0ter,

just to confirm, there is a bug with small negative values in the range -0.0 to -0.999. Negative values from -1.0 seem to be ok. I need to look into it and prepare a fix. This will take a few days.

Regards,

Helmut

hbitter commented 7 months ago

Hi pe0ter,

I just uploaded a new version of the NodeMCU firmware (NRZ-2020-134-DNMS-5.6) fixing the bug.

Regrads,

Helmut

pe0ter commented 7 months ago

Great, thank you HelmutMet vriendelijke groet,PeterOp 15 apr 2024 om 18:37 heeft Helmut Bitter @.***> het volgende geschreven: Hi pe0ter, I just uploaded a new version of the NodeMCU firmware (NRZ-2020-134-DNMS-5.6) fixing the bug. Regrads, Helmut

—Reply to this email directly, view it on GitHub, or unsubscribe.You are receiving this because you authored the thread.Message ID: @.***>