Ok First, i dont see any page numbers. However, i found fig 16-30 the third order HP filter.Example 16-4 on p.310 and Fig. 16-30 on p.311. Those pages are of the *.pdf.
So what is it that you dont understand about it or a low pass version?
Either way it will be a cascade of two filters sections, where one is first order and the other is second order, and the total response is the convolution of the two filter functions.
So what are you having a hard time with?
Oh one interesting fact i think is that if you design a LP filter with a certain -3db frequency and you exchange parts to make a HP filter i dont think the -3db frequency is the same as with the LP. I think the -6db frequency is though, but not the -3db frequency.
So if a LP filter has 3db down frequency of w=10 the high pass would have maybe w=15 or something, but if the LP filter had a 6db down frequency of w=10 then the 6db down frequency for the HP would be the same w=10. This is something that might not be expected.
We could look at this in more detail.
Last edited: