frequency span การใช้

• Sampling rate is often varied in relation to the frequency span under consideration.
• As the output of the transform is effectively amplitude / phase against log frequency, fewer frequency bins are required to cover a given range effectively, and this proves useful where frequencies span several octaves.
• However, there is a trade-off between how quickly the display can update the full frequency span under consideration and the frequency resolution, which is relevant for distinguishing frequency components that are close together.