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Linux Audio Update: The Fall Fashions

Oct 14, 2010, 19:33 (0 Talkback[s])
(Other stories by Dave Phillips)


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"This week's entry looks at a unique new audio editor, some important updates, and a very cool programming environment for graphics (and much more). As always, some tasty treats are cooking in the Linux audio kitchen. Ceres

"By default most soundfile editors display audio in the amplitude domain. For example, when you open a WAV or MP3 in Audacity you see a display of the sound's waveform, a representation of the sound as a series of amplitude values plotted over time (Figure 1). For most of your work you'll apply edits and effects processing to all or parts of the sound in that display. However, there is another type of audio representation in which the sound's frequencies are plotted over time in what is known as a spectral display (Figure 2). Most soundfile editors provide such a display, but few offer direct editing of its contents. Spectral editors are a rare but useful kind of audio editor, and Linux users are fortunate to have Kjetil Matheussen's version of the great Ceres, a spectral editor originally designed by Professor Oyvind Hammer for use in his work at NoTAM.

"Ceres was first designed for SGI machines, with dependencies that included the Motif graphics library, libaudiofile, and other components favored by SGI hardware and software. Fortunately the program has proven amenable to porting. As a matter of fact, Ceres was one of the first programs I tried to port back in the late 1990s. Since then various other (i.e. real) programmers have expanded its feature set and improved its overall usability."

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