Sound
Similarly, a source of sound can have many different frequencies mixed. A musical tone's timbre is characterized by its harmonic spectrum. Sound in our environment that we refer to as noise includes many different frequencies. When a sound signal contains es, distributed equally over the audio spectrum, it is called white noise.
Read more about this topic: Frequency Spectrum
Famous quotes containing the word sound:
“Methinks the human method of expression by sound of tongue is very elementary, & ought to be substituted for some ingenious invention which should be able to give vent to at least six coherent sentences at once.”
—Virginia Woolf (1882–1941)
“The Sound of battle fell upon my ear & heart all day yesterday—even after dark the cannon’s insatiate roar continued ...”
—Elizabeth Blair Lee (1818–?)
“Dignity takes alarm at the unexpected sound of laughter.”
—Mason Cooley (b. 1927)