8. Discrete Fourier Transform Demos

specgramdemo provides interactive control of the important parameters that define a spectrogram.

Features:

Change window length and window type
Change window overlap
Change FFT length (zero padding)
Show 1-D slice of spectrogram
Plot options: zooming, 30, 40, 50 and 60 dB magnitude ranges, four color maps
Three signal types: Sum of sinusoids, Linear chirp, Recorded signal, e.g., speech