| Complex
sounds: Multiple frequencies |
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| Tim |
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| e |
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| “wa” |
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| Tim |
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| e |
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| • | Natural
sounds: |
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| – | multiple
frequencies (music: piano chords, hitting keys |
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| simultaneously;
speech) |
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| – | constantly
changing (prosody in speech; trills in bird song) |
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| • | Hierarchical
system, to extract and encode higher |
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| features
(like braille in touch, pattern motion in vision) |
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