Guralp-systems Scream Manuel d'utilisateur télécharger pdf (Page 44)

Scream! 4.5

4.3.2 Viewing spectra

You can overlay the power spectra of up to two streams on the

frequency graph. This is intended to help you design filters for

specific events by focussing on the frequencies at which the event has

significantly more energy than the background noise.

To design a filter for a specific event:

1. View the relevant stream in a Waveview window and click the

Pause icon ( ). Zoom in to a time period where the stream is

quiet.

2. Holding down the shift-key ( ), select a single stream across

this quiet time range. Choose Use in Filter Design… from the

drop-down menu. The Filter Design window will appear, with

the spectrum of the background noise overlaid.

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Guralp-systems Scream Manuel d'utilisateur Page 44