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A [[low frequency oscillator]], or LFO, is an oscillator designed to produce signals whose [[frequency]] is at the bottom of, or below, the audio range. Nearly all synthesizers have at least one LFO or a [[digital]] equivalent.It is useful for producing a repeating control signal for a wide variety of purposes; when added to the control input of a [[voltage controlled oscillator|VCO]] it produces the effect known as [[vibrato]], and if it is added to the control signal of a [[voltage controlled amplifier|VCA]], it produces [[tremolo]]. A typical LFO can generate a variety of useful waveforms, including [[sine wave|sine]], [[triangle wave|triangle]], [[square wave|square]], [[sawtooth wave|ramp-up]], and [[sawtooth wave|ramp-down]].The most useful LFOs have an upper frequency limit above 100 Hz and a lower limit below 1 Hz (such frequencies may be given as seconds/cycle; for instance, a frequency of 20 seconds/cycle corresponds to 0.05 Hz). An LFO may or may not have [[control voltage|voltage control]] over its frequency or other wave parameters; an LFO with voltage control over the frequency is sometimes referred to as a "VCLFO". |
A [[low frequency oscillator]], or LFO, is an oscillator designed to produce signals whose [[frequency]] is at the bottom of, or below, the audio range. Nearly all synthesizers have at least one LFO or a [[digital]] equivalent.It is useful for producing a repeating control signal for a wide variety of purposes; when added to the control input of a [[voltage controlled oscillator|VCO]] it produces the effect known as [[vibrato]], and if it is added to the control signal of a [[voltage controlled amplifier|VCA]], it produces [[tremolo]]. A typical LFO can generate a variety of useful waveforms, including [[sine wave|sine]], [[triangle wave|triangle]], [[square wave|square]], [[sawtooth wave|ramp-up]], and [[sawtooth wave|ramp-down]].The most useful LFOs have an upper frequency limit above 100 Hz and a lower limit below 1 Hz (such frequencies may be given as seconds/cycle; for instance, a frequency of 20 seconds/cycle corresponds to 0.05 Hz). An LFO may or may not have [[control voltage|voltage control]] over its frequency or other wave parameters; an LFO with voltage control over the frequency is sometimes referred to as a "VCLFO". |
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[[Category:Circuits]] |
[[Category:Circuits]] |
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| β | [[Category:Control voltage sources]] |
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