I know this is probably a really simple question, but just help me out I am very desperate?
How to determine formants from a waveform if given time on the horizontal axis and amplitude on the vertical axis?
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You almost certainly do not want to compute the formants yourself (complex programming, way too long to describe here). If you can see a waveform in Praat, having selected a sound object and you clicked View & Edit, there should be 1 or two windows with waveform on the top, and another window at the bottow, which should display a spectrogram (if, clicking "Spectrum", you see a check on "Show Spectrogram"). In that same window, it will display pitch, amplitude and formants (look under "Formant"). If you want something besides a picture (i.e. numbers), if you select a part that you want analyzed, under Formant, you can select "formant listing" which will give you a series of formant calculations.