how to convert SPL in dBA to dB I wonder how I can convert dBA (A weighted) to dB and vice versa.
can anybody provide any kind of table or online conversion app?
thanks
following formula comes from https://en.wikipedia.org/wiki/A-weighting
:\begin{align}
  R_A(f) &amp;= {12194^2 f^4 \over \left(f^2 + 20.6^2\right)\ \sqrt{\left(f^2 + 107.7^2\right)\left(f^2 + 737.9^2\right)}\ \left(f^2 + 12194^2\right)}\ ,\\[3pt]
    A(f) &amp;= 20\log_{10}\left(R_A(f)\right) - 20\log_{10}\left(R_A(1000)\right) \\
         &amp;\approx 20\log_{10}\left(R_A(f)\right) + 2.00
\end{align}
how can I inverse this formula?
I also must mention that I have a specific frequency and I just want to convert this specific frequency SPL
You can't convert these directly. You need to start with either a calibrated pressure time domain pressure wave form or a calibrated power spectrum. To create calculate unweighted dBSPL yo simply sum the total energy. To calculate dBA, you need to apply an A-weighting filter to either one of those first.