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:
“Everywhere “good men” sound a retreat, and the word has gone forth to fall back on innocence. Fall forward rather on to whatever there is there.”
—Henry David Thoreau (1817–1862)
“Music is a good thing; and after all that soul-butter and hogwash, I never see it freshen up things so, and sound so honest and bully.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)
“The hills are alive with the sound of music.”
—Oscar Hammerstein II (1895–1960)