Creates a new Data Block of Sound Pressure Level (SPL) measurements from microphone Time waveforms, Fourier spectra or Auto spectra. When this command is executed, the following dialog box will open.
If Time Responses is chosen as the Data Source, all of the open Data Blocks with time waveforms in them are listed in the dialog box. SPL’s are calculated from time waveforms using spectrum averaging.
See Spectrum Averaging in the Signal Processing Commands chapter for details.
If Fourier, Auto Spectra is chosen as the Data Source, all of the open Data Blocks with Fourier spectra or Auto spectra in them are listed in the dialog box. SPL spectra are calculated in the following ways,
SPL spectrum = magnitude (Fourier spectrum)
SPL spectrum = Square Root (Auto spectrum with power units)
SPL spectrum = Auto spectrum with linear units