Low frequency oscillation
- Low frequency oscillation
-
Pour les articles homonymes, voir
LFO.
Un Low frequency oscillator (LFO) est un oscillateur très basse fréquence, ce qui permet de faire des modulations de signal sans que la fréquence modulante soit audible (fréquence infrasonique).
Le signal de modulation est généralement appliqué à l'amplitude du signal modulé, créant un effet de "vibrato en amplitude" (instruments électroniques, vibraphone…). Lorsqu'il est appliqué à la fréquence du signal modulé on obtient un effet de "vibrato en fréquence" (instruments à cordes frottées par archet, guitare…): le L.F.O. est alors constitué par l'appui oscillant du doigt sur la touche ou par une pression oscillante sur la poignée (scie musicale…).
Des considérations physiques (facture instrumentale) et de physiologie de l'audition permettent de constater que ces L.F.O. ont toujours un effet sur les autres paramètres sonores (les timbres des sons d'origine électronique sont modulables par un L.F.O.).
Voir aussi
Wikimedia Foundation.
2010.
Contenu soumis à la licence CC-BY-SA. Source : Article Low frequency oscillation de Wikipédia en français (auteurs)
Regardez d'autres dictionnaires:
Low Frequency Oscillation — Pour les articles homonymes, voir LFO. Un Low frequency oscillator (LFO) est un oscillateur très basse fréquence, ce qui permet de faire des modulations de signal sans que la fréquence modulante soit audible (fréquence infrasonique). Le signal de … Wikipédia en Français
Low-frequency oscillation — The term low frequency oscillation (LFO) is an audio signal usually below 20 Hz which creates a pulsating rhythm rather than an audible tone. LFO predominantly refers to an audio technique specifically used in the production of electronic music.… … Wikipedia
Low frequency oscillation — El término low frequency oscillation o LFO (traducido como oscilación de baja frecuencia ) se refiere a una señal de audio normalmente por debajo de 20 Hz que crea un ritmo palpitante en vez de un tono audible. LFO se suele referir al efecto de… … Wikipedia Español
Frequency compensation — In electrical engineering, frequency compensation is a technique used in amplifiers, and especially in amplifiers employing negative feedback. It usually has two primary goals: To avoid the unintentional creation of positive feedback, which will… … Wikipedia
Low-pass filter — A low pass filter is a filter that passes low frequency signals but attenuates (reduces the amplitude of) signals with frequencies higher than the cutoff frequency. The actual amount of attenuation for each frequency varies from filter to filter … Wikipedia
Frequency frogging — In telecommunication, the term frequency frogging has the following meanings: 1. The interchanging of the frequencies of carrier channels to accomplish specific purposes, such as to prevent feedback and oscillation, to reduce crosstalk, and to… … Wikipedia
frequency — Synonyms and related words: AF, CPS, EHF, HF, Hz, MF, RF, SHF, UHF, VHF, VLF, amplitude, antinode, audio frequency, carrier frequency, crest, cycles, de Broglie wave, diffraction, electromagnetic radiation, electromagnetic wave, extremely high… … Moby Thesaurus
Frequency — For other uses, see Frequency (disambiguation). Three cyclically flashing lights, from lowest frequency (top) to highest frequency (bottom). f is the frequency in hertz (Hz), meaning the number of cycles per second. T is the period in seconds (s) … Wikipedia
Neural oscillation — is rhythmic or repetitive neural activity in the central nervous system. Neural tissue can generate oscillatory activity in many ways, driven either by mechanisms localized within individual neurons or by interactions between neurons. In… … Wikipedia
Tuned radio frequency receiver — A tuned radio frequency receiver (TRF receiver) is a radio receiver that is usually composed of several tuned radio frequency amplifiers followed by circuits to detect and amplify the audio signal. A 3 stage TRF receiver includes a RF stage, a… … Wikipedia
