Reduction of effects of beat frequencies in systems with multiple oscillators
AssigneeHoneywell Inc.
InventorJoseph H. Ruby
Life of this patent
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Abstract
Apparatus for reducing the effects of beat frequencies in systems having multiple oscillators wherein a wide band frequency modulator operates to alter the frequency supplied by one of the oscillators at a rate high enough that any beat frequencies occur at rates undetectable to the human eye.
Claims16
A method of reducing the effects of beat frequencies in a system having more than one source of oscillating energy comprising:
- modulating at least one of the sources so that its oscillating energy changes frequency by an amount .DELTA.f and does so at a frequency F, .DELTA.f and F being chosen so that any beat frequency varies at a rate greater than that detectable by the human eye.
The method of reducing flicker in a fluorescent lamp having a filament energized from a first source of oscillating voltage wherein a second source of oscillating voltage is used to provide dimming for the lamp comprising:
- modulating the first source so that its voltage changes frequency by an amount .DELTA.f and at a rate F such that any beat frequency which may develop between the first and second sources is at an unnoticeable frequency.
Apparatus to prevent visible effects of beat frequencies in a system having first and second oscillators comprising:
- modulating means operable to produce a wide band output which changes frequency by an amount .DELTA.f at a rate F;
- and
- means connecting the modulating means to the first oscillator so as to change the output of the first oscillator by the amount .DELTA.f and at the rate F, .DELTA.f and F being chosen so that the beat frequencies change at a rate undetectable to the human eye.
Dependencies are inferred from the claim text.