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| - Aliasing is
- A form of distortion that results in a digital synthesizer, digital signal processor, or soft synth when the signal being processed exceeds the Nyquist frequency of the system.The result is the introduction of tones whose frequency is the difference between the original frequency and the Nyquist frequency. It is considered a particularly unpleasant form of distortion; it can account for the "hard" or "edgy" sound often attributed to digital synthesis or processing systems. One of the difficulties in writing code for a soft synth is ensuring that aliasing cannot occur in any part of the signal processing chain under any combination of patch parameters.
- In statistics, signal processing, and related disciplines, aliasing is an effect that causes different continuous signals to become indistinguishable (or aliases of one another) when sampled. When this happens, the original signal cannot be uniquely reconstructed from the sampled signal. Aliasing can take place either in time, temporal aliasing, or in space, spatial aliasing.
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| abstract
| - Aliasing is
- In statistics, signal processing, and related disciplines, aliasing is an effect that causes different continuous signals to become indistinguishable (or aliases of one another) when sampled. When this happens, the original signal cannot be uniquely reconstructed from the sampled signal. Aliasing can take place either in time, temporal aliasing, or in space, spatial aliasing. Aliasing is a major concern in the analog-to-digital conversion of video and audio signals: improper sampling of the analog signal will cause high-frequency components to be aliased with genuine low-frequency ones, and be incorrectly reconstructed as such during the subsequent digital-to-analog conversion. To prevent this problem, the signals must be appropriately filtered before sampling. It is also a major concern in digital imaging and computer graphics, where it may give rise to moiré patterns (when the original image is finely textured) or jagged outlines (when the original has sharp contrasting edges, e.g. screen fonts). Anti-aliasing techniques are used to reduce such artifacts.
- A form of distortion that results in a digital synthesizer, digital signal processor, or soft synth when the signal being processed exceeds the Nyquist frequency of the system.The result is the introduction of tones whose frequency is the difference between the original frequency and the Nyquist frequency. It is considered a particularly unpleasant form of distortion; it can account for the "hard" or "edgy" sound often attributed to digital synthesis or processing systems. One of the difficulties in writing code for a soft synth is ensuring that aliasing cannot occur in any part of the signal processing chain under any combination of patch parameters. Aliasing is sometimes produced intentionally as an effect, by means of downsampling a signal without applying anti-aliasing first to reduce the signal bandwidth below the Nyquist frequency. The effect is somewhat similar to that produced by amplitude modulation.
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