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oversampling |
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oversampling Creating a more accurate digital representation of an analog signal. In order to work with real-world signals in the computer, analog signals are sampled some number of times per second (frequency) and converted into digital code. Using averaging and different algorithms, samples can be generated between existing samples, creating more digital information for complex signals, "smoothing out the curve" so to speak.At Least Twice the Frequency According to the Nyquist theorem, sampling requires at least twice the bandwidth of the frequency being sampled. For example, with regard to sound, 20 kHz is the highest frequency perceptible to the human ear, and sampling is done at 44.1 kHz for high quality audio playback. A 2x oversampling means that the CD player runs at twice the rate, or 88.2 kHz, and inserts a made-up sample in between each real sample on the disc. An 8x oversampling runs eight times faster and so on. See sampling and Nyquist theorem. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | [omega]] we have obtained more explicit conditions and explicit formulas for the Fourier transforms of the dual generators [3]; the same paper also contains multi-channel oversampling formulas for band-limited signals and an application to the first and second derivative oversampling formulas. The audio recording interface constitutes a 128x oversampling converters and 24-bit data resolution that maintained all through signal path. The same is true for whether subject recruitment was likely to have resulted in oversampling of those with pain, whether an adequate description of what constitutes pain and how it is measured was included, and whether time since SCI onset was a criterion in subject selection. |
oversampling |
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