File:FFT aliasing 600.gif
FFT_aliasing_600.gif (600 × 400 pixels, file size: 4.88 MB, MIME type: image/gif, looped, 400 frames, 22 s)
Captions
Captions
Summary[edit]
| Description |
English: Animation showing how aliasing (frequency ambiguity) is a result of sampling a continuous waveform.
Upper left: Animation depicts a sequence of sinusoids, each with a higher frequency than the previous ones. These "true" signals are also being sampled (blue dots) at a constant frequency/rate, Upper right: The continuous Fourier transform of the sinusoid (not the samples). The single non-zero component, depicting the actual frequency, means there is no ambiguity. Lower right: The discrete Fourier transform of just the available samples. The presence of two components means the samples can fit at least two different sinusoids, one of which is the true frequency (upper-right). Lower left: Using the same samples (now in orange), the default reconstruction algorithm (i.e. in the absence of collateral information) produces the lower-frequency sinusoid. |
| Date | |
| Source | Own work |
| Author | Davidjessop |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:02, 7 April 2021 | | 600 × 400 (4.88 MB) | Omnicron11 (talk | contribs) | Readjusted some lines and turned the axes labels to be fully algebraic |
| 15:41, 5 April 2021 |  | 600 × 400 (3.56 MB) | Omnicron11 (talk | contribs) | Change x axis to be relative to dt and fs | |
| 13:46, 5 April 2021 |  | 600 × 400 (3.89 MB) | Omnicron11 (talk | contribs) | Change frequency to be relative | |
| 13:26, 5 April 2021 |  | 600 × 400 (3.86 MB) | Omnicron11 (talk | contribs) | Uploaded own work with UploadWizard |
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