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Octave Weighted Spectrum Analyzer - A little known product feature

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  • Octave Weighted Spectrum Analyzer - A little known product feature

    Most folks are quite familiar with the Diamond Cut fft Hertz based Spectrum Analyzer. It has extremely high resolution with capability of up to 131072 ffts.

    However, sometimes it is desirable to have a spectrum analyzer (or real time analyzer - RTA) that is octave weighted. This is important in the following situations:

    1. When setting up a sound system in a large venue, or even tweeking up your audio system in your soundlab. The Diamond Cut Octave weighted spectrum analyzer is compatible with commercial real time analog based graphic equalizers (usually installed between the soundboard or preamp output and the input of the system active crossover and/or power amplifiers). You can use your laptop computer in conjunction with a calibrated flat microphone to perform these sorts of measurements and compensations in your sound system.

    2. When making sound measurements of pure tones and their harmonics to determine noise conformance with OSHA or local statutes.

    So, where is this thing? It is hidden within the regular Spectrum Analyzer found under the View Menu. You need to go to the Options drop-down menu and you will see that you can select a 10 band Octave Analyzer or a 30 Band 1/3rd Octave Analyzer. Usually, ones sets the start frequency for 20 Hz and the stop frequency for 20,000 Hz.

    Did you know that was there? Your software has a lot of things like that that are a bit hidden.

    Enjoy,

    Craig
    Last edited by Craig Maier; 01-20-2015, 10:06 PM.
    "Who put orange juice in my orange juice?" - - - William Claude Dukenfield

  • #2
    This is in the Forensics version only ?

    Marc

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    • #3
      Hi Marc,

      Thanks for the edification. Yes, it is only in the Forensics version. If someone needs it for just a job or two, they can download the demo version which will work for 15 days. As an aside, I forgot to mention that to use it in real-time, you need to open the Multifilter and use Live Preview mode. If you use it to measure against legal standards for pure tones, you will need a calibrated micophone and/or a calibrated acoustical signal source. For relative measurements (like setting up a sound system) a known flat microphone is the only requirement (usually electret types).

      Craig
      Last edited by Craig Maier; 01-20-2015, 10:07 PM.
      "Who put orange juice in my orange juice?" - - - William Claude Dukenfield

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