Method used in a CD player to reproduce digital information as faithfully as possible in analogue form, a part of the digital to analogue conversion process.
Scanning at more than an optimum sampling rate.
A digital filter which calculates additional samples between those taken from the disc, providing a closer representation the original analog signal and therefore better sound quality.
Scanning at more than the ideal sampling rate
Sampling with a rate much higher that Nyquist rate, e. g. to reduce the cost and improve the performance of the pre-filter. Also applicable to post-filtering where the data are upsampled for use in oversampling output stages.
Multiplying the sampling frequency (44.1kHz) in a CD player to a higher frequency to shift noise components above audible levels. This feature creates a gentler low pass filter with more musical characteristics. This process usually yields a data rate of 352.8 kHz through 8x oversampling. [Go to source
Oversampling is used during the analog to digital (A/D) and digital to analog (D/A) conversion processes in a digital recorder, sampler or playback device. Essentially, the sampling rate of the converter is multiplied to a very high rate (i.e. 4x oversampling puts the rate at 176.4 kHz). This accomplishes two things: First, it allows the anti-aliasing and anti-imaging filters on the converters to be much more gentle, which reduces phase distortion. Second, in a 4x oversampled system, it results in a 6 dB drop in noise (other rates result in more or less noise reduction). The data stored on a standard Red Book audio CD is 16-bits, at 44.1 kHz. While oversampling might result in a better A/D conversion when making the CD master, and an oversampling CD player might result in better D/A playback, this is a function of the converters, not the data on the CD. Digitally "cloning" that CD will produce an exact bit-for-bit copy. Since no conversion to analog is used, oversampling does not enter into the picture.
A technique designed to remove the high-frequency harshness associated with digital recordings.
In computer graphics, oversampling or anti-alisasing is a software technique for addressing alisasing issue. Anti-aliasing reduces the prominence of jaggies by surrounding the stairsteps with intermediate shades of gray (for gray-scalling devise) or color (for color devices). Please note that although anti-aliasing may reduce the jagged appearance of the lines, it also may make the lines appear fuzzier.
Oversampling basically means that the audio is actually sampled at 64 times the sample frequency, say 48kHz, which ends up being 3072kHz. It is then averaged over the sample period using Mean Square Law and the resulting sample is used. There are a number of different algorithms used calculate the final output sample. It basically gives a more acurate sample for the given sampling period.
Used in DAC systems. Increases signal frequency, making it easier for conversion circuitry and ancillary systems to filter out unwanted signals.
Sampling at a rate higher than the Nyquist (q.v.) sampling rate. This reduces the need for sharp (expensive) analogue filters to control aliasing (q.v.).
A digital technique of representing a waveform with more bits of information than would theoretically be needed. Oversampling is used to reduce the amount of noise (unintended information) in a signal.P
A process where the analog audio (or the digital audio for playback) is sampled many times more than the minimum sampling rate.
Digital samples must be at least double the frequency of the analog signal in order for the digital sample to accurately represent the analog signal. The human ear cannot hear frequencies over 20kHz, therefore 44.1 kHz is the industry standard for digital sampling, since all frequencies over the 20kHz digital sample would be inaudible. Oversampling is a digital filter that boosts the frequency of the digital sample. Two reasons for this: 1) boosting the frequency helps the digital sample to be converted to analog more faithfully during playback, and 2) the leftover digital frequencies are filtered out so that the signals do not interfere with other electronics.
Oversampling occurs when the input waveform of an ADC is sampled at a much higher frequency (fSAMPLE2 fIN) than the Nyquist ( see also Nyquist Frequency) theorem mandates. This technique provides a processing gain by effectively reducing the noise floor of the converter. Doubling the sampling frequency increases the signal-to-noise ratio by 3dB.
For an ADC, sampling the analog input at a rate much higher than the Nyquist frequency is called oversampling. Oversampling improves the ADC's dynamic performance by effectively reducing its noise floor. Improved dynamic performance leads, in turn, to higher resolution. Oversampling is the basis of sigma-delta ADCs. See also application note Demystifying Sigma-Delta ADCs
Doubling or quadrupling (or by even a higher factor of 2 squared) the sampling frequency during the digital to analog process to obtain a high frequency for digital filtering.
(OSA) See: Anti-aliasing
To take multiple sets of data redundantly. Usually indicates digitization of a signal at a rate faster than the maximum information frequency of the data. An oversampling rate of at least two is indicated by information theory to avoid aliasing of repetitive information (moire).
The process of creating more digital samples using the original data from a CD. Oversampling provides the digital-to-analog converter with more information about the signal, providing a smoother, more natural reproduction of sound.
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.