Hi everybody I'm trying to compute plot 1/3 octave frequency of wave file . As anyone any idea about the right algorithm? Thanks a lot
plot 1/3 octvave frequency
Started by ●July 13, 2012
Reply by ●July 13, 20122012-07-13
On Thu, 12 Jul 2012 22:37:34 -0500, zohasaba <zoha_saba@yahoo.com> wrote:>Hi everybody > >I'm trying to compute plot 1/3 octave frequency of wave file . As anyone any idea about the right algorithm? >Thanks a lot >If you can read MATLAB code there are a few examples in the File Exchange. I found this one and I have seen others. http://www.mathworks.com/matlabcentral/fileexchange/19228-short-time-fft-with-octave-smooth Mark DeArman
Reply by ●July 13, 20122012-07-13
zohasaba wrote:> I'm trying to compute plot 1/3 octave frequency of wave file . As anyone > any idea about the right algorithm?- read the wave file - do a fourier transform and store the result in an spectrum array - create an array of 1/3 octave values - fill this array from the spectrum array data: - sum up all values in the spectrum array whose frequency belongs into one specific octave value point. - Put this sum into the octave value array. - repeat this for all octave value points bye Andreas -- Andreas H�nnebeck | email: acmh@gmx.de ----- privat ---- | www : http://www.huennebeck-online.de Fax/Anrufbeantworter: 0721/151-284301 GPG-Key: http://www.huennebeck-online.de/public_keys/andreas.asc PGP-Key: http://www.huennebeck-online.de/public_keys/pgp_andreas.asc
Reply by ●July 13, 20122012-07-13
On Thursday, July 12, 2012 8:37:34 PM UTC-7, zohasaba wrote:> Hi everybody > > I'm trying to compute plot 1/3 octave frequency of wave file . As anyone any idea about the right algorithm? > Thanks a lotIf you Google on: 1/3 octave filter you will find explanations of fractional octave filters, codes for such filters and homework assignments to familiarize yourself with such filters. Dale B. Dalrymple