undersampling
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Undersampling — Man spricht in der Digitaltechnik von Unterabtastung oder englisch Undersampling, wenn ein Signal mit weniger als der doppelten Bandbreite diskretisiert (abgetastet) wird. Undersampling verletzt die Regeln des Shannonschen Abtasttheorems, und… … Deutsch Wikipedia
Oversampling and undersampling in data analysis — are techniques used to adjust the class distribution of a data set (i.e. the ratio between the different classes/categories represented). Oversampling and undersampling are opposite and roughly equivalent techniques. They both involve using a… … Wikipedia
Sampling (signal processing) — Signal sampling representation. The continuous signal is represented with a green color whereas the discrete samples are in blue. In signal processing, sampling is the reduction of a continuous signal to a discrete signal. A common example is the … Wikipedia
Nyquist–Shannon sampling theorem — Fig.1: Hypothetical spectrum of a bandlimited signal as a function of frequency The Nyquist–Shannon sampling theorem, after Harry Nyquist and Claude Shannon, is a fundamental result in the field of information theory, in particular… … Wikipedia
Anti-aliasing filter — An anti aliasing filter is a filter used before a signal sampler, to restrict the bandwidth of a signal to approximately satisfy the sampling theorem. Since the theorem states that unambiguous interpretation of the signal from its samples is… … Wikipedia
Oversampling — In signal processing, oversampling is the process of sampling a signal with a sampling frequency significantly higher than twice the bandwidth or highest frequency of the signal being sampled. Oversampling helps avoid aliasing, improves… … Wikipedia
Drizzle (image processing) — Drizzle (or DRIZZLE) is a digital image processing method for the linear reconstruction of undersampled images. It is normally used for the combination of astronomical images and was originally developed for the Hubble Deep Field observations… … Wikipedia
Цифровая обработка сигналов — (ЦОС, DSP англ. digital signal processing) преобразование сигналов, представленных в цифровой форме. Любой непрерывный (аналоговый) сигнал может быть подвергнут дискретизации по времени и квантованию по уровню (оцифровке), то… … Википедия
Digital signal processing — (DSP) is concerned with the representation of discrete time signals by a sequence of numbers or symbols and the processing of these signals. Digital signal processing and analog signal processing are subfields of signal processing. DSP includes… … Wikipedia
Discrete Fourier transform — Fourier transforms Continuous Fourier transform Fourier series Discrete Fourier transform Discrete time Fourier transform Related transforms In mathematics, the discrete Fourier transform (DFT) is a specific kind of discrete transform, used in… … Wikipedia
