FILTRE ANTI REPLIEMENT PDF
Filtre anti-repliement (anti-aliasing). Il est inutile et même nuisible d’imposer à un système de TNS des signaux dont les variations seraient plus rapides que ce. French term or phrase: filtre anti-repliement. This term crops up in a text on noise emissions in conjunction with an EU project. The “filter” is part. The categories of this image should be checked. Check them now! Remove redundant categories and try to put this image in the most specific.
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View Ideas submitted by the community. A technique known as oversampling is commonly used in audio ADCs. An anti-aliasing filter is a low-pass filter that accomplishes this. Retrieved from ” https: The KudoZ network provides a framework for translators and others to assist each other with translations or explanations of terms and short phrases. I think I know the answer to this from googling on the web but it would be nice if someone with technical knowledge could confirm.
Detection repliemejt Discrete signal Estimation theory Nyquist—Shannon sampling theorem. Participation is free and the site has a strict confidentiality policy. Depliement signals that are bandwidth limited, but not centered at zero, a band-pass filter can be used as an anti-aliasing filter. Return to KudoZ list. Anti-aliasing filters are commonly used at the input of digital signal processing system’s analog to digital converter ; similar filters are used as reconstruction filters at the output of such systems, for example in music players.
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Handbook of Image Quality: Generalizations of the Nyquist—Shannon sampling theorem allow sampling of other band-limited passband signals instead of baseband signals. It is very important to tepliement input signal overload when using an anti-aliasing filter. An anti-aliasing filter AAF is a filter used before a signal sampler to restrict the bandwidth of a signal to approximately or completely satisfy the sampling theorem over the band of interest.
Often, an anti-aliasing filter is a low-pass filter ; this is not a requirement, however. Patents, Trademarks, Copyright Law: Bayer filter cameras, an additional filter is generally needed to reduce aliasing to an acceptable level.
A realizable anti-aliasing filter will typically either permit some aliasing to occur or else attenuate some in-band frequencies close to the Nyquist limit. For the moment I prefer NOT to give “my” answer so as not to set you off on the wrong track. In the case of optical filtrf sampling, as by image sensors in digital camerasthe anti-aliasing filter is also known as an optical low-pass filter OLPFblur filteror AA filter.
For this reason, many practical systems sample higher than would antu theoretically required by a perfect AAF in order to ensure that all frequencies of interest can be reconstructed, a practice called oversampling.
Because analog filters have relatively high cost and limited performance, relaxing the demands on the analog filter can greatly reduce both aliasing and cost. Since the theorem states that, unambiguous reconstruction of the signal from its samples is possible when the power of frequencies above the Nyquist frequency is zero, a real anti-aliasing filter trades off between bandwidth and aliasing.
The typical implementation in digital cameras is two layers of birefringent material such as lithium niobatewhich spreads each optical point into a cluster of four points. If fkltre signal is strong enough, it can cause clipping at the analog-to-digital convertereven after filtering.
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Le rôle du filtre anti-aliasing
Audio signal processing Digital image processing Anyi processing Statistical signal processing. Scientific photography and applied repilement. This was also “my” answer and I needed confirmation of someone in the field.
Digital signal processing Linear filters Electronic filter applications Anti-aliasing. The mathematics of sampling in two spatial reepliement is similar to the mathematics of time-domain sampling, but the filter implementation technologies are different.
The “filter” is part of a measuring system made up of displacement transducers, incremental encoders, signal conditioners and a PC which includes 25 Hz dual-input filters that are described as “anti-repliement”.
The choice of spot separation for such a filter involves a tradeoff among sharpness, aliasing, and fill factor the ratio of the active refracting area of a microlens array to the total contiguous area occupied by the array.
WO2011063461A1 – Filtre anti-repliement à deux degrés de liberté – Google Patents
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French PRO pts in category: How does one select the right filter? Review native language verification applications submitted re;liement your peers. Post Your ideas for ProZ. Alternatively, a signal may be intentionally oversampled without an intermediate frequency to reduce the requirements on the anti-alias filter.
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