The Reassigned Spectrogram

  • Sean A. FulopEmail author
Part of the Signals and Communication Technology book series (SCT)


This chapter introduces a relatively new modified form of the spectrogram which has variously been described by the term reassigned, or by the phrase time-corrected instantaneous frequency. While the latter is more descriptive of the scheme, the former is shorter and seems to have gained supremacy in the (still rather sparse) literature on the subject. The reassignment process yields a modification of a spectrogram which effectively “sharpens” it, concentrating the smeared out spectrographic points around tighter lines in both the frequency and time dimensions. This approach relies on the understanding of the spectrogram as showing instantaneous frequencies of line components, and sharpens that view of things while doing away with the idea of showing how energy is distributed in the time–frequency plane.


Instantaneous Frequency Line Component Mixed Partial Derivative Kaiser Window Phonation Type 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.Department of LinguisticsCalifornia State University FresnoFresnoUSA

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