How do sound-pressure levels [dB] help to assess measurement results?

In the graphical user interface of NoiseImage, different sound pressure levels are shown that are designed to help the user assess and evaluate the measurement results.

  1. (93.1 dB) The average root-mean-square (RMS) of all active microphone channels is shown in the status bar of the channel view with respect to the selected time interval. Unless a time interval is selected, the calculation is performed over the entire measurement time.
  2. (82.8 dB) In the status bar of the spectrum, the average RMS of all active microphone channels is given with respect to the selected time and frequency interval. Unless a frequency interval is selected, the calculation is performed over the entire frequency range.

The following three dB-values relate to the acoustic photo. These values depend on the settings of the applied plug-ins.

  1. (82.6 dB) Lp (Tooltip) denotes the sound pressure level at the position of the mouse cursor, independent of the given resolution of the acoustic image.
  2. (99.3 dB) Lw (Tooltip) denotes the sound power level at the position of the mouse cursor. The calculation is based on the assumption of a point source at the position of the mouse cursor.
  3. (82.60 dB) The highest dB-value in the colour bar of the acoustic photo indicates the maximum sound pressure level in the acoustic image, depending on the given resolution of the acoustic image.

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