Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Periodogram> ?p ?o. }
Showing items 1 to 19 of
19
with 100 items per page.
- Periodogram abstract "The periodogram is an estimate of the spectral density of a signal. The term was coined by Arthur Schuster in 1898 as in the following quote:Note that the term periodogram may also be used to describe the quantity , which is its common meaning in astronomy (as in "the modulus-squared of the discrete Fourier transform of the time series (with the appropriate normalisation)"). See Scargle (1982) for a detailed discussion in this context.A spectral plot refers to a smoothed version of the periodogram. Smoothing is performed to reduce the effect of measurement noise.In practice, the periodogram is often computed from a finite-length digital sequence using the fast Fourier transform (FFT). The raw periodogram is not a good spectral estimate because of spectral bias and the fact that the variance at a given frequency does not decrease as the number of samples used in the computation increases. The spectral bias problem arises from a sharp truncation of the sequence, and can be reduced by first multiplying the finite sequence by a window function which truncates the sequence gradually rather than abruptly. The variance problem can be reduced by smoothing the periodogram. Various techniques to reduce spectral bias and variance are the subject of spectral estimation.One such technique to solve the variance problems is also known as the method of averaged periodograms or as Bartlett's method. The idea behind it is, to divide the set of N samples into L sets of M samples, compute the discrete Fourier transform (DFT) of each set, square it to get the power spectral density and compute the average of all of them. This leads to a decrease in the standard deviation as".
- Periodogram wikiPageID "485457".
- Periodogram wikiPageRevisionID "574640816".
- Periodogram hasPhotoCollection Periodogram.
- Periodogram subject Category:Fourier_analysis.
- Periodogram subject Category:Frequency_domain_analysis.
- Periodogram comment "The periodogram is an estimate of the spectral density of a signal. The term was coined by Arthur Schuster in 1898 as in the following quote:Note that the term periodogram may also be used to describe the quantity , which is its common meaning in astronomy (as in "the modulus-squared of the discrete Fourier transform of the time series (with the appropriate normalisation)").".
- Periodogram label "Periodogram".
- Periodogram label "Periodogram".
- Periodogram label "Periodogramm".
- Periodogram label "Периодограмма".
- Periodogram label "週期圖法".
- Periodogram sameAs Periodogramm.
- Periodogram sameAs Periodogram.
- Periodogram sameAs m.02g5c4.
- Periodogram sameAs Q587619.
- Periodogram sameAs Q587619.
- Periodogram wasDerivedFrom Periodogram?oldid=574640816.
- Periodogram isPrimaryTopicOf Periodogram.