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Maintaining Sonic Texture with Time Scale Compression by a Factor of 100 or More

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Time lapse photography is a common technique to present a slowly evolving visual scene with an artificially rapid temporal scale. Events in the scene that unfold over minutes, hours, or days in real time can be viewed in a shorter video clip. Audio time scaling by a major compression factor can be considered the aural equivalent of time lapse video, but obtaining meaningful time-compressed audio requires interesting practical and conceptual challenges in order to retain the original sonic texture. This paper reviews a variety of existing techniques for compressing 24 hours of audio into just a few minutes of representative "time lapse" audio, and explores several useful modifications and challenges.

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Permalink: http://www.aes.org/e-lib/browse.cfm?elib=15672

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