Noise Removal

After discussing this subject with my clients, I have included this page to help in understanding the process and associated problems. There is some additional information in the FAQ’s PDF file.

The three images  below represent “waveforms” of a “pure” tone or sine wave, a modulated tone, and an actual case example. Clicking on the play button will let you hear the various sounds associated with the waveform. The first two are simple but convey how the sound changes when unwanted elements are added. Notice too, the difference in the waveforms.

In this example both the waveform and audio are a composite of the original plus the added noise. It is very difficult, and sometimes impossible, to separate the various components. Frequently the unwanted content can be reduced or minimized by specialized signal processing. The degree of success depends on many parameters present in the recording.

This is a 2 second section of sound I processed for a case.  It is a VERY complex and noisy recording. The small wiggles near the center of the waveform are two spoken words. Note how voice, noise, and other interference are all combined.