Thanks, glad you enjoyed it! Lately I’ve had a break from full time work, so I could dedicate all my time to them. This one took a little over three weeks I think, which is pretty typical. His next book, Physical Audio Signal Processig, is a pretty huge tomb of a textbook so I imagine it would take much longer even with full time dedication. I started it but have to put it down for a bit to look for work. Even with this Filters book it was easy to get stuck on a single problem for most of the day.
