Tuesdsay, February 3, 2009

Learned a lot about dB and octaves. First, for Power ratios, the definition for dB is 10log(P1/P0)...NOT 20!! That is only for amplitudes!! Also, when finding points for a PSD based off of a spec which specifies slopes such as dB/oct, make sure that you are using the right reference number for your dB calculations!!!! The forward point is always the reference point... that is your reference amplitude and your reference frequency. If you have a spec which says 6 dB/oct, then that means that it is 6 dB per octave slope FROM THAT POINT!....that point is P0... not P1.