Artificial auxiliary extraction method for time-frequency characteristics of frequency modulation type signals of aquatic animals

The invention relates to an artificial auxiliary extraction method for time-frequency characteristics of frequency modulation type signals of aquatic animals, and belongs to the field of signal processing. Theartificial auxiliary extraction method comprises the following steps of: preliminarily determining the trend of each profile curve of the signals by adopting artificial auxiliary point selection according to narrow-band frequency modulation characteristics of the signals; finely adjusting manually selected points to ensure that the manually selected points fall on the contour line, and determining initial and end points of the contour; automatically obtaining contour points at equal intervals, and obtaining the frequency of the signal and an energy modulation function through an interpolation algorithm; and automatically extracting acoustic characteristic parameters such as starting frequency, inflection point number, harmonic number and contour type according to the modulation function. According to the