Quote:
brucek wrote:
 It's telling you that it's not an accurate true RTA display below that frequency indicated. It has to do with the FFT math. It is still an accurate level with respect to the pink noise used and the level received from the microphone, but it can't be called a true RTA representation below that frequency. ...brucek |
When I set things to the highest (most accurate) settings, i.e. Mode RTA 1/48 octave and FFT length 131072 it shows a ">39 Hz" in the "Mode" line so you are saying it is not an accurate display from 0 to 39 Hz? If I reduce the Mode setting to RTA 1/24 octave it then says ">19 Hz" which means it is only not an accurate display from 0 to 19 Hz now? Then dropping down one further to RTA 1/12 octave, the Hz setting now longer shows up so now the display is the most accurate all the way down to 0 Hz?
Why is it that decreasing the Mode to a "worse" setting gives a more accurate display?