[Yusheng]

Sorry, I meant “fundamental frequency”.
Think about a square wave or a pulse wave which has a period of T. They contain a fundamental frequency 1/T, and many harmonics at the frequencies n*1/T.

[Yusheng]

Below is my thought. It might be wrong.

When we transform ‘a window of’ signal into the frequency domain, we make an assumption that the signal is periodic with an interval of the window length T. We “give” a base frequency of 1/T to that piece of signal. Therefore 1/T is the frequency resolution, and the larger window size, the higher frequency resolution.

[Yusheng]

Hi, Danielle, I think that is a mistake in the book.

It’s interesting that in my ebook, the author says that the resonance frequency is around 4000 Hz, which I think is the correct figure. I think ‘3000Hz’ in ‘hardly respond at all to frequencies above 3000Hz’ may be ‘8000Hz’, otherwise the whole paragraph doesn’t seem to make sense.

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