Switch to
| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
8
|
| pubmed:dateCreated |
1992-8-4
|
| pubmed:abstractText |
Fourier transformation (FT) of an N-point time-domain discrete signal produces, after phase correction, two independent data sets: an N/2-point absorption spectrum, A(omega), and an N/2-point dispersion spectrum, D(omega), each with the same information content. Usually only A(omega) is kept. The dispersion-mode information has conventionally been recovered in either of two ways. First, the N/2-point magnitude-mode spectrum, M(omega) = ([A(omega)]2 + [D(omega)]2)1/2, offers a square root of 2 improvement in precision compared with the original N/2-point absorption spectrum, but with poorer resolving power (factor ranging from square root of 3 to 2 for unapodized data). Alternatively, zero-filling the initial time-domain data to 2N data points prior to Fourier transformation results in an N-point absorption-mode spectrum with the same peak width and peak-height-to-noise ratio as the original N/2-point absorption spectrum, but with a square root of 2 improvement in precision. Thus, magnitude-mode display improves FT spectral precision at the expense of a loss in resolving power, whereas zero-filling improves precision at the expense of having to store twice as many data points. In this paper, we present a third method of recovering the dispersion information.(ABSTRACT TRUNCATED AT 250 WORDS)
|
| pubmed:grant | |
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:status |
MEDLINE
|
| pubmed:month |
Apr
|
| pubmed:issn |
0003-2700
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:day |
15
|
| pubmed:volume |
64
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
916-23
|
| pubmed:dateRevised |
2007-11-14
|
| pubmed:meshHeading | |
| pubmed:year |
1992
|
| pubmed:articleTitle |
Hartley/Hilbert transform spectroscopy: absorption-mode resolution with magnitude-mode precision.
|
| pubmed:affiliation |
Department of Biochemistry, Ohio State University, Columbus.
|
| pubmed:publicationType |
Journal Article,
Research Support, U.S. Gov't, P.H.S.,
Research Support, Non-U.S. Gov't
|