oversampling


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oversampling

Multiplying the number of samples in a digital signal by some factor. For example, the early CD players were improved when their digital audio signals were multiplied 8 times before sending them to the digital-to-analog converter (DAC). The digital filters were found to operate more efficiently at higher frequencies. See upsampling.
References in periodicals archive ?
In general, those methods are derivatives of the oversampling techniques, like for example Delta-Sigma A/D conversion [7] with main difference that stochastic approach excludes feedback loop, which is inevitable in Delta-Sigma A/D conversion.
Frequency domain oversampling [7] can extend the error tolerance; however the tolerance is less than 5 Hz.
Hosseinzadeh and Eftekharia [25] preprocessed the original data using the fuzzy cluster and synthetic oversampling technique (SMOTE) to obtain the training set on which Rotation Forest is learned.
The representative scheme is randomly oversampling the minority class and undersampling the majority class [17, 18] or a combination of both schemes.
But random undersampling can potentially rmove certain important samples, and random oversampling can lead to overfitting.
Interchangeable digital load cells equipped with individual 18 bit 4 times oversampling AD converters are said to improve the performance by a factor of 20.
So in general, some degree of oversampling is considered, which introduces redundancy in the coefficients, in order to "smooth" the biorthonormal window [gamma](k), for the sake of numerical stability.
Inverse-Probability Oversampling. An intuitive method for correcting for sample selection bias is the plain replication of each observation in the sample according to its IP weight (i.e., in a stratified random sample, one replicates an observation of stratum h by the factor [w.sub.h]).
On Monday, Trump said "WikiLeaks also shows how John Podesta rigged the polls by oversampling Democrats, a voter suppression technique." A "pants-on-fire" lie, says PolitiFact.
Trump has made 55 "Pants on Fire" comments, including today's comment on how Clinton campaign chairman John Podesta (http://www.politifact.com/personalities/donald-trump/statements/byruling/pants-fire/) rigged polls by oversampling Democrats as a voter suppression technique.
In oversampling mechanism suitable percentages must be provided for creation of synthetic data points in each class, to render magnitude of each class closer to magnitude of two largest classes; C7 and C17 (i.e.