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Extraction frequency and amplitude from FFT

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  • Oktober 29, 2015 um 8:26 am Uhr #12892
    Damian PietrusiakDamian Pietrusiak
    Teilnehmer

    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 !!!

    Oktober 29, 2015 um 8:26 am Uhr #8552
    Damian PietrusiakDamian Pietrusiak
    Teilnehmer

    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 !!!

    Oktober 30, 2015 um 1:18 pm Uhr #9412
    Bernhard KantzBernhard Kantz
    Teilnehmer

    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:

    
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]
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