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SOURCE-SIGNAL ANALYSIS 547
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(F)
Fig. 16-1. Methods of representing three-dimensional spectral data in two dimensions
(cont.). (F) Optically weighted character set. Spectral plot
using optically weighted characters.
sampled spectrum, amplitude data values are only known at specific increments
of time and frequency. Thus, if the two dimension~ of a sheet ofpaper
correspond to time (horizontal) and frequency (vertical), then the area has
been divided into an array of rectangles, much like graph paper. What is
drawn within the confines of a particular rectangle represents amplitude at
that time and frequency intersection. One could simply draw a bar line in the
rectangle such that the length corresponds to amplitude as in Fig. 16-1C. If
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