1 Reply Latest reply on Apr 8, 2008 3:31 PM by (Drew_Daniels)

    frequency analysis window

    Level 1
      Hi Guys,

      the frequency analysis window is c h a r a c t e r i z e d by displaying
      white noise as a straight line. This can be misleading to the newcomer. It
      should have the ability to reference pink noise instead as well as to accept
      input of other reference curves and be able to display the deviation from
      those. That would save the works step of applying a bias eq to sound that is
      to be analyzed, be it in a music or a measurement context.

      Kind regards

      Peter Larsen
        • 1. Re: frequency analysis window
          White noise is reference for virtually all FFT analyzers. Pink noise consists of equal POWER in all bands of a given width (hence the traditional Octave, 1/3, 1/6, 1/12 and 1/24th-octave bands extant on constant bandwidth analyzer windows), but since successive octaves of sound contain twice as many Hz, the power doubles from the bottom to the top of any given octave where the point-to-point Hz in it exhibit the same voltage values.

          A "pinking filter" for the FFT display isn't a bad idea, as long as a bright red indication appears to tell dummies that the display has a filter engaged. Such a pinking filter is available for SMAART, which is called an "inverse pink" filter. It levels the FFT display when pure pink noise is input. The 3 kbyte SMAART Inverse Pink file: http://drewdaniels.com/INV_PINK.ref is not presently a .dll and would need re-writing to work with other apps.