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Extraction frequency and amplitude from FFT

Page d'accueil ' Communauté ' Généralités ' Extraction de la fréquence et de l'amplitude à partir de la FFT

  • Ce sujet contient 2 réponses, 2 participants et a été mis à jour pour la dernière fois par Dam…iak, le il y a 10 années et 8 mois.
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  • 29.10.2015 à 08:26 #34585
    Dam…iak
    Participant

    My aim is to find the amplitude and frequency of the 3 highest maxima from FFT in defined frequency range.
    I tried Maximum function but as a result I got only amplitude without frequency.
    I am looking for tool which give me both components (frequency and amplitude).
    I need that to write those information to some table/txt or similar.

    Thank you in advance for any hints !!!

    29.10.2015 à 08:26 #34587
    Dam…iak
    Participant

    My aim is to find the amplitude and frequency of the 3 highest maxima from FFT in defined frequency range.
    I tried Maximum function but as a result I got only amplitude without frequency.
    I am looking for tool which give me both components (frequency and amplitude).
    I need that to write those information to some table/txt or similar.

    Thank you in advance for any hints !!!

    30.10.2015 à 13:18 #34586
    Ber…ntz
    Maître des clés

    When you have your spectrum given as a signal (a FlexPro object with frequency as x component) you can use the FPScript function Extrema() to locate the local maximas, sort them in descending order and output the first three elements:

    [code]
    Dim data = ChannelSpektrum
    Dim hyst = 0.05 * Range(data)
    Dim ind = Extrema(data, hyst, EVENT_POSITIVE)
    Dim ext = data[ind]
    Sort(ext, SORT_Y+SORT_DESCENDING)[0,2]
    [/code]

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