How to convert narrow band to third octave band
How to convert narrow band to third octave band
(OP)
I have a pressure signal p(t), I made the FFT of (p/p0), now I want to get the sound pressure level of every third octave band between 16 and 20000Hz (by this way I can add logarithmically the 32 values and I have the dB of the noise, so that the sum doesn't depend by the frequency discretization). If I'm right I should convert the amplitude of FFT from narrow band to third octave band, but how could I do? Please let me know something





RE: How to convert narrow band to third octave band
then check by adding all the 1/3 octaves up to see if you get the same overall level.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: How to convert narrow band to third octave band
I don't understand: if I do so I could sum directly all the values (it gives the same result) and it depend by how many points I take. How could I do?
RE: How to convert narrow band to third octave band
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.