In a waveform, what is produced by multiple frequencies that interfere with each other?

The presence of multiple frequencies interacting in a waveform leads to the production of a complex tone. A complex tone is characterized by the combination of different frequencies, which can create a rich and diverse sound profile. When these frequencies combine, they generate harmonics and overtones that contribute to the timbre of the sound, making it more intricate than a simple, pure tone, which consists of only one frequency.

In contrast, a pure tone is produced by a single frequency and lacks the complexity and variety of sounds associated with a complex tone. Narrowband noise refers to a type of noise that has a limited range of frequencies, while wideband noise encompasses a broad spectrum of frequencies. These noise types do not necessarily involve the structured harmonic relationships that give rise to the characteristic qualities of a complex tone. Thus, the interaction of multiple frequencies resulting in a complex tone is key to understanding the broader concepts of sound analysis and synthesis.