
 The educational encyclopedia, digital audio (Site not responding. Last check: 20071018) 
  Audio effects explained a series of original articles that explains how effects work, what the common effects parameters do, some of the implementation issues, and also include sound examples to demonstrate how those parameters alter the sound 
  Digital filter.com design/analyze digital/analog filter, FIR, IIR, FFT, DSP, VHDL source code, step/impulse response, Bode/Nyquist diagram, mixed signal, polynomial roots... 
  Digital filters digital filters, a digital filter uses a digital processor to perform numerical calculations on sampled values of the signal. 
 users.telenet.be /educypedia/electronics/digitalaudio.htm (464 words) 
