Reason for this spectrogram behaviour

    Timo Kuchheuser's icon
    Timo Kuchheuser
    Aug 20 2019 | 6:27 pm
    Hey all, why do the low-gain frequencies of this sine wave "jump" up and down? I also tried using another analyzer (iZotope Insight)... it shows me the same bevahiour? I have the feeling it's not some kind of error. Can somebody please explain?
    Thank you very much!
    Example
    Example
    • Aug 21 2019 | 8:41 am
      Floating Point's icon
      Floating Point
      it's just an artifact of the analysis process being done by the spectrogram; theoretically it should just be a single vertical line at 440 hz, not a curve, but because of variables such as
      input signal wave table size input signal bit-depth analysis window size, analysis window shape, sample rate phase of the signal analysis algorithm you get artifacts
    • Aug 22 2019 | 4:09 pm
      Timo Kuchheuser's icon
      Timo Kuchheuser
      I see. Thank you for the clarification!