+1 Great book. Although it can be a bit handwavey and a bit light on the math. Honestly I think it's best supplemented with a good signals and systems text.

+1 Great book. Although it can be a bit handwavey and a bit light on the math. Honestly I think it's best supplemented with a good signals and systems text. I like "Signal Processing and Linear Systems" by Lathi and "Digital Signal Processing : principles, algorithms and applications" by Proakis.