Discussion
Narrow band spectrogram is the most suitable to study which of the following ?
Answer: A
A narrow band spectrogram is best for studying harmonics.
A spectrogram's analysis bandwidth sets a trade-off between frequency and time resolution. A narrow band filter (around 45 Hz) resolves frequency finely, so the individual harmonics of the voice appear as separate horizontal lines and their movement shows the pitch contour.
A wide band filter (around 300 Hz) blurs the harmonics together but resolves time finely, so it shows formants as dark bands and individual glottal pulses as vertical striations. Amplitude is shown by darkness on both kinds.
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