Guralp-systems Scream Manuel d'utilisateur télécharger pdf (Page 40)

Scream! 4.5

window, hold at the same time. To zoom out, right-click on the

frequency scale, holding , if necessary, to apply to all

spectrograms.

The example below shows data from a CMG-5TD which is sensing a

signal of approximately 40 Hz (green trace at the top). The Red trace

shows the N/S component, with the spectrogram zoomed in once, and

the blue trace where the spectrogram is zoomed in again, to the

39-40.5 Hz region. On closer inspection, it can be seen that the signal

frequency is changing over time, which was not apparent from the

un-zoomed green trace.

4.3 The Filter Design window

The Filter Design window allows you to alter the appearance of

streams in Waveview windows by applying low-pass, high-pass or

band-pass filters. Each Waveview window can have its own Filter

Design settings.

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Guralp-systems Scream Manuel d'utilisateur Page 40