A Tutorial on the Fast Fourier Transform URL

[Richard Moody]

> A good introduction but soon gets very technical. ---ric

http://www.intersrv.com/~dcross/fft.html


A Tutorial on the Fast Fourier Transform
1. Introduction to digital audio
If you are already familiar with general digital audio concepts, you can skip
this section.
The most common type of digital audio recording is called pulse code modulation
(PCM). Pulse code modulation is what compact discs and most WAV files use. In
PCM recording hardware, a microphone converts a varying air pressure (sound
waves) into a varying voltage. Then an analog-to-digital converter measures
(samples) the voltage at regular intervals of time.
....................................