Spectral mask (2304 bytes)
1: ...[radio]] (or [[optical]]) [[transmission]]s. The spectral mask is generally intended to reduce [[interferen...
3: The spectral mask is usually one of the things defined in a [[...
5: ... sidebands – overstepping the bounds of the spectral mask set forth for FM by the [[NRSC]] and [[enfor...
7: ...] very [[efficient]]ly, allowing for a very tight spectral mask. This allows placement of [[broadcast statio...

Spectral signature (509 bytes)
1: '''Spectral signatures''' are measurements of the percentage ...
3: ...eceiving light reflected by a target. Calibration spectral signatures are collected in order to apply an emp...

Spectral theorem (9078 bytes)
1: ...are as simple as one can hope to find. See also [[spectral theory]] for a historical perspective.
3: Examples of operators to which the spectral theorem applies are [[self-adjoint operator]]s or...
5: ...provides a canonical decomposition, called the '''spectral decomposition''' of the underlying vector space o...
7: ...However, as noted above, for a Hilbert space, the spectral theorem also holds for normal operators.
33: The spectral theorem is also true for symmetric operators on f...

Spectral envelope (318 bytes)
1: ... by the range of brightness levels in each of the spectral bands of interest.

Spectral method (2800 bytes)
1: In applied mathematics, '''Spectral methods''' are algorithms to solve certain kinds ...

Spectral class (425 bytes)
1: ...efers to classifying objects according to their [[spectral line]]s, which indicate an object's chemical comp...
6: * [[Asteroid#Spectral_classification|Asteroids]]<!-- should maybe be a ...

Spectral masking (615 bytes)
1: '''Spectral masking''' is a [[sound effect]] that arises from...
3: ...frequency domain version of [[temporal masking]], spectral masking tends to occur in sounds with similar fre...

Spectral Bat (3199 bytes)
2: <tr><th bgcolor=pink>Spectral Bat<br>{{StatusConcern}}</th></tr>
20: ...se Vampire Bat''', '''False Vampire Bat''' and '''Spectral Vampire Bat'''. Confusingly, they are not related...

Spectral width (910 bytes)
1: ...length]] interval over which the magnitude of all spectral components is equal to or greater than a specifie...
3: ...has a complex shape. Another method of specifying spectral width is a special case of [[root-mean-square dev...
5: The ''relative spectral width'', &Delta;&lambda;/&lambda;, is frequently ...

Spectral sequence (6270 bytes)
1: ...lgebraic topology]] or [[group cohomology]], a '''spectral sequence''' is a sequence of [[differential modul...
7: ...ological algebra. Historically (since about 1950) spectral sequence arguments have been an important researc...
11: One way to visualise what is occurring in a spectral sequence is by means of a notebook–[[spreadsheet]...
15: ...ence.png|frame|Example: E₂ member of a spectral sequence]]Notationally the ''E''_''n'' ...
17: ...''a'' and ''b'' depending only on n. That is, the spectral sequence as ''process'' is analogous to a book wi...

Spectral theory (2241 bytes)
1: ...The later discovery in [[quantum mechanics]] that spectral theory could explain features of [[atomic spectru...
3: ...development of abstract [[Hilbert space]] and the spectral theory of a single [[normal operator]] on it did ...
5: ...nsform]] on the [[real line]] is in one sense the spectral theory of [[derivative|differentiation]] ''qua'' ...
7: Aspects of spectral theory include:
11: * [[Spectral theorem]], [[self-adjoint operator]], [[continuou...

Spectral line (4808 bytes)
1: A '''spectral line''' is a dark or bright line in an otherwise ...
3: Spectral lines are the result of interaction between a [[q...
7: ...ans -- [[helium]], [[thallium]], [[cerium]], etc. Spectral lines also depend of the physical conditions of t...
9: ...chanisms than atom-photon interaction can produce spectral lines. Depending on the exact physical interactio...
11: === Spectral line broadening ===

Spectral reflectance (506 bytes)
3: '''Spectral reflectance''' curves are generated by [[Spectrop...

Spectral leakage (813 bytes)
1: ...[[Spectral density | power spectral density]]), ''Spectral Leakage'' will occur if any of the input signal's...
3: Spectral leakage also occurs when the DFT is taken of a si...
5: ... how [[window function |Window functions]] affect spectral leakage.

Spectral density (1436 bytes)
1: ...ectral density''', or more correctly the '''power spectral density''' (PSD) of a given [[bandwidth]] of [[el...
3: '''Spectral density''' is usually expressed in [[watt]]s per ...
5: ... power and energy spectral densities. The energy spectral density is defined as
15: ... density may not exist. Thus we define the power spectral density as the -->
23: * [[Spectral leakage]],

Spectral radius (984 bytes)
1: In [[mathematics]], the '''spectral radius''' of a [[matrix (mathematics)|matrix]] or...
8: ...''spectral radius''' of a [[planar graph]] is the spectral radius of its [[adjacency matrix]].
21: ...//www.cs.uwa.edu.au/~gordon/remote/planareig.html Spectral Radius of Planar Graphs]

Spectral evidence (1855 bytes)
1: ...Salem Witchcraft Trials]] was the admission of '''spectral evidence'''.
3: Spectral evidence was testimony that the accused witch's s...
7: ...t for his role in the trials and the admission of spectral evidence till his death.
9: ..., Cotton's father, however, became an opponent of spectral evidence - though not until after the Salem hangi...

Spectral color (629 bytes)
1: ...lor that is part of the [[optical spectrum]]. The spectral colors are:
13: Among some of the colors that are '''not''' spectral colors are:
16: ... color obtained by mixing a grayscale color and a spectral color

Spectral space (740 bytes)
1: ...], a [[topological space]] ''X'' is said to be '''spectral''' if

Spectral Band Replication (973 bytes)
1: '''Spectral Band Replication''' or '''SBR''' is a technology ...

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