Figure A shows a narrow band filter (bw=50Hz) and a broad bnand filter (bw=300Hz) in relation to the harmonic components of a voice source (f0=100Hz). Figure B showsshows the difference in appearance of the narrow and broad band spectrogram that results from the use of the narrow and broad band filter settings.

Can you explain the differences in appearance of the two spectrograms? Specifically, can you explain the wavy horizontal striations on the narrow band spectrogram? What do they represent? How about the vertical striations on the broad band spectrogram? What do they represent, and why do they not appear on the narrow band spectrogram?