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Entries found for search: harmonic

anharmonic : See ="index.php?search=1&searchtxt=inharmonic">inharmonic.

aharmonic : See inharmonic.

harmonic : A frequency that is a whole-number multiple of the fundamental. For example, if the fundamental frequency of the sound is 440Hz, then the first two harmonics are 880Hz and 1.32kHz. A harmonic is the same as a partial where the partials exhibit the property that the overtones are mathematical multiples of the fundamental frequency. See harmonic series, Appendix  C.

harmonic distortion : The onset of harmonic distortion is the displacement of energy from a single frequency to its harmonics. The presence of harmonic frequencies added to an output signal by an electrical circuit or speaker, generally undesirable, caused by the system not being perfectly linear, such as when an amplifier is operated in a nonlinear portion of its transfer curve. It is expressed as a percentage of the original signal:

(Total Signal - Fundamental Signal) THD = Total Signal In a perfect audio device, such as an amplifier or tape recorder, the output signal would be a replica of the input signal with no changes except possibly the amplitude of the signalmaybe power level. See also doubling.

harmonic enhancement : A technique used by aural enhancers. See harmonic synthesis."

harmonic envelope : The natural decay in the harmonics of a natural instrument over time.

harmonic series : A set of all of the frequencies which are an integral multiple of the frequency of the lowest tone, or fundamental. Humans perceive a harmonic series as a single pitch whose tonal quality is determined by the exact mix of related harmonics present. Below are illustrated the first sixteen harmonics in the harmonic series for the fundamental, C=65.4Hz. The notes indicating the 7th, 13th, 14th and 15th harmonics occur slightly flat or sharp of the notated pitch.See harmonic, partial.

harmonic series tuning : A tuning system which is based on the first sixty harmonics of the tonic, resulting in a tuning which is not based on the usual diatonic scale. There are more notes per octave as the tuning progresses up the harmonic series; the top 32 keys of a keyboard cover one octave in pitch.

harmonic structure : The sequence of chords used in a piece of music.

harmonic synthesis : A technique used by aural enhancers which creates new high-frequency harmonics not present in the original recording. Adding a small amount of carefully controlled distortion can make a sound quality appear cleaner and more detailed. This happens by sending some dry sound to a side-chain highpass filter. The output of the filter is processed dynamically to add phase-shift and create synthesized HF (only) harmonics related to the dry signal.

inharmonic : Containing frequencies that are not whole-number multiples of the fundamental. See harmonic, partial, clangorous.

subharmonic : A harmonic lower in frequency than the fundamental. Sometimes subharmonics are produced by loudspeakers that have poorly controlled cone resonances. The audible effect is a distortion component one octave lower than the input signal frequency.

third harmonic distortion : That part of harmonic distortion which represents only the third harmonic (three times the fundamental frequency) of a sine wavepure tone input to an electronic device. The third harmonic of any tone is musically an octave and a fifth above the original tone, and is easily noticeable in the output. For this reason, the MOL of analog tape recorders, for example, is often specified as that level at which third harmonic distortion reaches 3%..

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