Can anyone help

Can anyone help....

I'm solving examples about finding convolution graphically and i have problmes solving them, if there is any good book teaching it with a nice way with examples, pls i need the names of the books.
Digital Signal Processing: by Steven Smith is free on the web and has an excellent example of solving convolutions graphically.
The joy of convolution is a website that shows you what convolution looks like graphically.
Its at

Also Steven Smith's book is a brilliant book (not only for convolution) and I also highly recommend it :D

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