Difference between revisions of "Geopsy: Automatic gain control"
(New page: '''Automatic gain control (AGC)''', reached from the Waveform menu, modifies the amplitude of the signals in the active signal viewer to...) |
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| + | [[Image:AGC.png|thumb|right|200px|Automatic Gain Control pop-up window]] | ||
'''Automatic gain control (AGC)''', reached from the [[Geopsy: Waveform Menu|Waveform menu]], modifies the amplitude of the signals in the active [[Geopsy: Signal Viewer|signal viewer]] to retrieve signals with a constant RMS value. | '''Automatic gain control (AGC)''', reached from the [[Geopsy: Waveform Menu|Waveform menu]], modifies the amplitude of the signals in the active [[Geopsy: Signal Viewer|signal viewer]] to retrieve signals with a constant RMS value. | ||
By clicking on AGC, a pop-up window appears asking for the window width. This is the moving window length, in seconds, on which the average RMS value around the current point is computed. The amplitude of the current point is divided by this RMS value. The default window length is 0.1 s. | By clicking on AGC, a pop-up window appears asking for the window width. This is the moving window length, in seconds, on which the average RMS value around the current point is computed. The amplitude of the current point is divided by this RMS value. The default window length is 0.1 s. | ||
| − | This option is useful for [[Wikipedia:Reflection Seismic|reflection seismic]] to increase the amplitudes of attenuating signals. | + | This option is useful for instance for [[Wikipedia:Reflection Seismic|reflection seismic]] to increase the amplitudes of attenuating signals. It is '''''not advised''''' for array processing techniques |
| + | aiming at deriving the phase velocities of surface waves : [[Ambient vibration array]], [[Active source experiment (MASW)]] | ||
| − | + | ''Automatic gain control (AGC)'' creates new [[Geopsy: Temporary Signal|temporary signals]] in the active viewer. | |
See also: | See also: | ||
| − | [[Wikipedia: | + | [[Wikipedia:Automatic_gain_control|Automatic Gain Control (Wikipedia)]] |
Latest revision as of 13:43, 12 March 2010
Automatic gain control (AGC), reached from the Waveform menu, modifies the amplitude of the signals in the active signal viewer to retrieve signals with a constant RMS value. By clicking on AGC, a pop-up window appears asking for the window width. This is the moving window length, in seconds, on which the average RMS value around the current point is computed. The amplitude of the current point is divided by this RMS value. The default window length is 0.1 s.
This option is useful for instance for reflection seismic to increase the amplitudes of attenuating signals. It is not advised for array processing techniques aiming at deriving the phase velocities of surface waves : Ambient vibration array, Active source experiment (MASW)
Automatic gain control (AGC) creates new temporary signals in the active viewer.
See also: Automatic Gain Control (Wikipedia)
