6
of Figure 2. This signal is then passed through a low-pass filter, which removes the digital "switching
noise." The end result, shown in the bottom half of Figure 2 is an analog output signal whose waveshape
is a very close approximation of the original analog input signal. The foregoing is a very brief and, of
necessity, oversimplified explanation of how digital audio works. For the interested reader, the book
Principles of Digital Audio
by Ken C. Pohlmann, copyright 1985 by Howard W. Sams, is highly
recommended.
Figure 2: Digital-to-Analog
Conversion