The Send waveform in Cool Edt from a few threads ago, for example, showed ringing
that is not present in a mathematically-perfect square wave. But the square
wave-aware displays I know of simply draw a square wave when the input sufficiently
resembles one, thus not necessarily displaying the true wave shape either. There are
almost-square waves that will fool most of them, and certain steganographic
techniques that depend on producing "almost" wave shapes, square and other, to keep
things interesting.
To examine a perfect digital-domain square wave critically, it is (or at least used
to be) necessary to use a digital-domain presentation. The simplest, most readily
available tool for this was usually a binary editor, but audio data files are so big
they often choke (or at least challenge) available computer resources in opening an
editing session.
Hex.c is a simple-minded program I cobbled together seven years ago to work somewhat
like Unix's Head, since I only wanted to look at -- not alter -- the data values, and
not a great many of them at that. I will make the source and/or an MSDOS executable
available to anyone who would like it.
Gary
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