dbo:abstract

 Instantaneous phase and frequency are important concepts in signal processing that occur in the context of the representation and analysis of timevarying functions. The instantaneous phase (also known as local phase or simply phase) of a complexvalued function s(t), is the realvalued function: where arg is the complex argument function.The instantaneous frequency is the temporal rate of the instantaneous phase. And for a realvalued function s(t), it is determined from the function's analytic representation, sa(t): where represents the Hilbert transform of s(t). When φ(t) is constrained to its principal value, either the interval (−π, π] or [0, 2π), it is called wrapped phase. Otherwise it is called unwrapped phase, which is a continuous function of argument t, assuming sa(t) is a continuous function of t. Unless otherwise indicated, the continuous form should be inferred. (en)
 在信號處理中，觀察信號的瞬時頻率是很重要的課題。假設一实信號 可寫成指數信號的N項相加(有無穷多種表示法，以 小的為宜，即， 其中 為虚常數。則瞬時頻率(以頻率表示， k=1,...,N (zh)

dbo:wikiPageID
 
dbo:wikiPageLength

 8463 (xsd:nonNegativeInteger)

dbo:wikiPageRevisionID
 
dbo:wikiPageWikiLink
 
dbp:wikiPageUsesTemplate
 
dct:subject
 
rdfs:comment

 在信號處理中，觀察信號的瞬時頻率是很重要的課題。假設一实信號 可寫成指數信號的N項相加(有無穷多種表示法，以 小的為宜，即， 其中 為虚常數。則瞬時頻率(以頻率表示， k=1,...,N (zh)
 Instantaneous phase and frequency are important concepts in signal processing that occur in the context of the representation and analysis of timevarying functions. The instantaneous phase (also known as local phase or simply phase) of a complexvalued function s(t), is the realvalued function: where arg is the complex argument function.The instantaneous frequency is the temporal rate of the instantaneous phase. And for a realvalued function s(t), it is determined from the function's analytic representation, sa(t): where represents the Hilbert transform of s(t). (en)

rdfs:label

 Instantaneous phase and frequency (en)
 瞬時頻率 (zh)

owl:sameAs
 
prov:wasDerivedFrom
 
foaf:depiction
 
foaf:isPrimaryTopicOf
 
is dbo:wikiPageRedirects
of  
is dbo:wikiPageWikiLink
of  
is foaf:primaryTopic
of  