Look up: aliasing

1. 
   Aliasing
   An occurrence of interference where an analogue signal has been digitised. This can occur in images from a CCD chip camera where it is looking at a lots of vertical lies spaced closely together (high frequency), it is also known as Moiré patterning.
   Found on http://www.zoo.co.uk/~z0001325/Glossary.
   
   
2. 
   Aliasing
   Visibly jagged steps along angled lines or object edges, due to sharp tonal contrasts between pixels.
   Found on http://www.ordnancesurvey.co.uk/oswebsit
   
   
3. 
   Aliasing
   A sampler mis-recognizing a signal sent to it that is at a frequency higher than the Nyquist Frequency. Upon playback, the system will provide a signal at an incorrect frequency (called an alias frequency). Aliasing is a kind of distortion.
   Found on http://www.testing1212.co.uk/a.htm
   
   
4. 
   Aliasing
   (Digital cameras and photo printers) Pixel-shaped curves on the diagonal edges of objects. This can sometimes occur since all graphics consist of individual pixels. Anti-aliasing reduces this unwelcome effect by recalculating the contrast values of the neighbouring pixels and matching them up with each other.
   Found on http://www.olympus.co.uk/consumer/208_10
   
   
5. 
   Aliasing
   Unwanted frequencies produced when harmonic components in the audio signal being sampled by a digital recording device or generated within a digital sound source are above the Nyquist frequency. Aliasing is also sometimes referred to as fold-over. See Nyquist Frequency
   Found on http://www.musiconmypc.co.uk/art_glossar
   
   
6. 
   Aliasing
   a type of distortion that occurs when digitally recording high frequencies with a low sample rate. A visual analogy can be found in video, when a car's wheels appear to slowly spin backwards while the car is quickly moving forward. Similarly when you try to record a frequency greater than one half of the sampling rate (Nyquist Frequency), instead o...
   Found on http://www.traditionalmusic.co.uk/music%
   
   
7. 
   Aliasing
   The erroneous interpretation of high-frequency signals as lower-frequency signals. Such misinterpretations are an expected result of making discrete measurements with sampling devices such as analog-to-digital (A/D) converters.In motion sequences temporal aliasing is the effect that occurs when the frame rate is not high enough for the sampling rat...
   Found on http://www.diracdelta.co.uk/science/sour
   
   
8. 
   Aliasing
   In a sampled data system, the analog input must be sampled at a rate of at least twice the bandwidth of the signal in order to avoid loss of data (Nyquist Theorem). Adhering to the Nyquist Theorem prevents in-band 'alias' signals, which are beat frequencies between the analog signal and the sampling clock that inherently occur.
   Found on http://www.flowmeterdirectory.com/flowme
   
   
9. 
   aliasing
   1. (jargon) When several different identifiers refer to the same object. The term is very general and is used in many contexts. See alias, aliasing bug, anti-aliasing. 2. (hardware) (Or 'shadowing') Where a hardware device responds at multiple addresses because it only decodes a subset of the address lines, so different values on the other lines a...
   Found on
   
   
10. 
    aliasing
    the visual effect that occurs on a display screen whenever the degree of detail in the displayed image exceeds the resolution available on the output device Category: Automation (includes telecommunications and computers) • the introduction of error into a signal when the sampling rate is less than the minimum required by the bandwidth of the signal,due to overlap of the resulting side...
    Found on http://www.mijnwoordenboek.nl/definition
    
    
11. 
    Aliasing
    When a line or any shape (curve, circle or font text character) is painted, and its edges are not perfectly horizontal or vertical, some pixels are only partially covered. The resulting jagged-edged lines are said to be aliased. Aliasing gives lines a 'stair-step' or 'jaggy' appearance. The greater the number of dots or pixels on your display, the ...
    Found on http://www.rodsmith.org.uk/photographic%
    
    
12. 
    aliasing
    <microscopy> A pattern of image sampling error in digital systems. Aliasing forces spatial frequency components higher than a critical value (the Nyquist frequency) to be displayed at progressively lower frequencies. Aliasing introduces an undesirable moire pattern when the spatial frequency of the signal exceeds the sampling rate in a digiti ...
    Found on http://www.mondofacto.com/facts/dictiona
    
    
13. 
    Aliasing
    In statistics, signal processing, computer graphics and related disciplines, `aliasing` refers to an effect that causes different continuous signals to become indistinguishable (or `aliases` of one another) when sampled. It also refers to the distortion or artifact that results when a signal is sampled and reconstructed as an alias of the original signal. When we view a digital photograph, the reconstruction (interpolation) is performed by a di...
    Found on http://en.wikipedia.org/wiki/Aliasing
    
    
14. 
    Aliasing
    An undesirable distortion component that can arise in any digitally encoded information (sound or picture).
    Found on http://www.filmland.com/glossary/Diction
    
    
15. 
    Aliasing
    A distortion (artifact) in the reproduction of digital audio or video that results when the signal frequency is more than twice the sampling frequency. The resolution is insufficient to distinguish between alternate reconstructions of the waveform, thus admitting additional noise that was not present in the original signal.
    Found on http://www.videohelp.com/glossary?A
    
    
16. 
    aliasing
    introduction of errors into the frequency spectrum of a sampled signal when components with frequencies too great to be analysed with the sampling interval being used contribute to the amplitude of lower frequency components
    Found on http://www.electropedia.org/iev/iev.nsf/
    
    
17. 
    aliasing
    the distortion caused by sampling a signal at an inappropriate rate and which results in the overlapping of the sidebands around the harmonics of the sampling frequency in the spectrum of the sample signal
    Found on http://www.electropedia.org/iev/iev.nsf/
    
    
18. 
    aliasing
    a picture impairment arising because the number of display elements is insufficient to correctly represent the desired image
    Found on http://www.electropedia.org/iev/iev.nsf/
    
    
19. 
    aliasing
    the distortion caused by sampling a signal at an inappropriate rate and which results in the overlapping of the sidebands around the harmonics of the sampling frequency in the spectrum of the sampled signal
    Found on http://www.electropedia.org/iev/iev.nsf/