Oversampling
The Nyquist-Shannon Sampling Theorem used as the basis for all analog capturing requires a sampling Frequency equal to slightly more than twice the frequency of the analog signal. In other words, to accurately Sample 20kHz (20,000Hz) audio you need a sampling frequency of at least 40.1kHz (20,000 x 2 + 1). Oversampling refers to sampling at a higher frequency than the Nyquist Frequency.
Although in theory Oversampling isn't necessary, in reality consumer equipment isn't capable of the precision required by the Sampling Theorem. By taking additional samples, accuracy is improved, resulting in a digital sound or image closer to the original.
Related glossary terms
Related software tools
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VirtualDub (Open source)
VirtualDub is an extremely efficient video capture and processing program. |
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VirtualDub (Freeware)
Extremely efficient video capture and processing program. This version is not the latest one, but this is the last version that has ASF support |
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VirtualDubMod (Freeware)
VirtualDubMod is a modified version of the excellent video handling tool, VirtualDub. VirtualDubMod adds support for MPEG-2, AC3, Ogg Vorbis and VBR MP3 to the original VirtualDub. |
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VirtualDubMod Surround (Open source)
VirtualDubMod Surround is a VirtualDubMod with some bugs fixed. It's also capable of utilizing 6 channel audio ACM encoders. |
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