What is Reddit's opinion of Discrete-Time Signal Processing (Prentice-Hall Signal Processing Series)?

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Oppenheim and Schafer is a standard text. I have a very old copy and I have always thought of this stuff as an engineering version of abstract algebra.

You didn't mention if you're doing Continuous or Discrete, but I used Discrete-Time Signal Processing in grad school and it's considered a pretty good book.

Alan Oppenheim's lectures at MIT are also a great source of information.

https://www.amazon.com/Discrete-Time-Signal-Processing-3rd-Prentice-Hall/dp/0131988425/

Yeah I have to agree. If you want advanced DSP you need to look toward Oppenheim or Proakis.

These are essentially the defacto standard for learning and teaching DSP in American universities.

I know of some good text books that are pretty easy to read. The Oppenheim and Schafer are considered by a lot of my former profs to be the bible of DSP intro:

http://www.amazon.com/gp/product/0131988425/ref=pd_lpo_k2_dp_sr_1?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=0132146355&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=17WDV1JR8EA7P3D8W78A

It's pretty comprehensive, so if you're looking for something simpler, this is a pretty short and intuitive intro text (which was actually my first exposure to DSP!):

http://www.amazon.com/Digital-Signal-Processing-Primer-Applications/dp/0805316841