Pure tone
826809
226099368
2008-07-16T20:39:02Z
Jim.henderson
2255048
[[Fourier theorem]] link
A '''pure tone''' is a tone with with a sinusoidal waveshape.
A [[sine wave]] is characterized by its ''frequency'' — the number of cycles per second, or its ''[[wavelength]]'' — the distance the waveform travels through its medium within a period, and the ''[[amplitude]]'' — the size of each cycle. A pure tone has the unique property that its waveshape and sound are changed only in amplitude and phase by linear acoustic systems.
== Fourier theorem ==
The [[Fourier theorem]] states that any periodic waveform can be approximated as closely as desired as the sum of a series of sine waves with frequencies in a [[harmonic series (mathematics)|harmonic series]] and at specific [[phase (waves)|phase]] relationships to each other.
The lowest of these frequencies (the [[fundamental frequency]]), which is also the inverse of the period of the waveform, determines the [[pitch (music)|pitch]] of the tone, which is perceived by the human hearing. In music, [[note]]s are assigned to tones with different fundamental frequencies, in order to describe the pitch of played tones.
[[Category:Pitch]]
[[Category:Sound]]
[[Category:Noise pollution]]
[[de:Sinuston]]
[[pl:Ton (dźwięk)]]
[[fi:Äänes]]
[[it:Suono puro]]
[[ja:純音]]
[[sv:Sinuston]]
[[zh:纯音]]