Geopsy

Tutorials

• Spectral ratio H/V

• Spectral amplitudes

• Ambient vibration array

• Active source experiment (MASW)

Basic signal processing

Basic signal processing methods are provided for fast analysis. By contrast with Tools, they execute only one simple action (filter, cut,...). All operations can be started interactively from the Waveform menu or through a scripting engine (Waveform console or Waveform command line).

• Waveform menu
• Waveform console
• Waveform command line

Methods that process individually all signals:

• Subtract value
• Subtract signals
• Multiply
• Filter
• Automatic gain control
• Whiten
• Clip
• Phase shift
• Over sample
• Taper
• Cut
• Merge
• Decimate amplitude
• Decimate time

Special methods that process individually all signals:

• Wavelet transform
• STA/LTA

Methods that process several signals together:

• Rotate components
• Correlations

They all apply to the currently active Signal Viewer. The original signals are never altered. Operations are applied to a temporary copy (Temporary signals), automatically removed once there is no more Signal Viewer referring to it. Each method is performed in a specific domain (e.g. time of frequency). If the signals of the active Signal Viewer are not in the right domain, they are internally converted with the Fast Fourier Transform before processing. The initial domain is restored after processing. Results of a transformation can be saved permanently into the current Signal database or exported to a file (Export signals).