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:
“As usual the Liberals offer a mixture of sound and original ideas. Unfortunately none of the sound ideas is original and none of the original ideas is sound.”
—Harold MacMillan (1894–1986)
“Philosophy ... does not talk, but write, or, when it comes personally before an audience, lecture or read; and therefore it must be read to-morrow, or a thousand years hence. But the talker must naturally be attended to at once; he does not talk on without an audience; the winds do not long bear the sound of his voice.”
—Henry David Thoreau (1817–1862)
“In journalism it is simpler to sound off than it is to find out. It is more elegant to pontificate than it is to sweat.”
—Harold Evans (b. 1928)