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Aliasing in the time domain for the estimation of power spectra

✍ Scribed by R. Kinns

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
434 KB
Volume
26
Category
Article
ISSN
0022-460X

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✦ Synopsis

When power spectral analysis is performed on a small digital computer, it is usually necessary to use a non-uniform data window in order to obtain desired spectral window properties. Unfortunately, this leads to loss of resolution and increased correlation between estimates without a corresponding reduction in their variance.

It is shown that aliasing in the time domain may be used to restore resolution and reduce the correlation between spectral estimates when it is desired to maximize the information computed in a specified time, while optimal use of data is not important. The technique is particularly useful when data loss would otherwise occur in real-time analysis because the data processing rate is lower than the sampling rate.

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