Plotting and charting: The virtual oscilloscope

To many readers this may seem a rather minor use of a drawing program. However, the author (JAS) has found the tools for signal processing to be lacking. Application areas for signal display include communications, audio and biomedical systems.

This example illustrates two features that are not generally supported in a signal display:

• The display of two selections together. In this case a zoomed segment is shown below another.
• The display of a processed segment or an analysis of a segment along side the original signal.

In addition to these features, one application of the Adage system might be a dynamic oscilloscope-type signal viewer. This would be able to produce the same kind of display but allow the user to scroll through interactively.

Patch-clamp record. A simulated signal with two C-O-C ion channels. The middle plot is a segment of the upper signal, and the lower plot shows a smoothed signal and indication of the envelope. Creation method: Octave, Gnuplot & XFig, ps output.

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