This is about filter design of Hamming's digital filter. The chapter 3.9 is outstanding, so I would like to make a note.
While ago there was a soccer game. How to suppress the Vuvuzela sound (but other sounds should pass) was a popular topic at that time. In this case, you analyze the frequency of Vuvuzela sound and design a filter which doesn't pass that frequency. The design of digital filter is: which frequency of the signal will be passed and which frequency of the signal will not be passed.
See the following article for instance, http://blogs.mathworks.com/loren/2010/06/30/vuvuzela-denoising-with-parametric-equalizers/
In chapter 3.9, a simple non recursive filter design is described as an example.
The filter looks like the following.
The filter is:
We design a digital filter, but, it is still not clear what this is. So, next time, I will input the actual signal into this filter and see how this filter works.
3 days ago