Good find nickb. I implemented several audio systems including a Noise reduction filter for a voip provider, an MP3 duplicate detection engine just by reading this book. I had no prior DSP experience. This has easy to understand 'feynman' kind of writing. I highly recommend this if you are digging around DSP or just want to understand signals.

require 'open-uri'; (1..34).to_a.each{|x| open('http://www.dspguide.com/CH'+x.to_s+'.PDF'){|u| File.open("CH#{x}.PDF","w"){|f|f.puts u.readlines}}}

Thanks nickb. If you are on a windows machine you need to use "wb" instead of "w" for this to work. Here is a version that works on windows:

require 'open-uri';(1..34).to_a.each{|x| open("CH#{x}.PDF", "wb").write(open('http://www.dspguide.com/CH1.PDF').read)}

Ah, good to know! Thanks!

PS: Those who are wondering wtf this is all about, save it as book.rb and run 'ruby book.rb' and it will grab all the PDFs of that book for you.

This didn't work for me. I just changed "w" to "wb" on XP and nickb's original worked fine:

require 'open-uri'; (1..34).to_a.each{|x| open('http://www.dspguide.com/CH'+x.to_s+'.PDF'){|u| File.open("CH#{x}.PDF","wb"){|f|f.puts u.readlines}}}