Efficiency audible alarm
First Claim
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1. A sound generating device comprising:
- a first acoustic chamber;
a second acoustic chamber;
a plate interposed between the first and second acoustic, the plate being capable of being vibrationally excited and operative to generate sound in the first and second acoustic chambers substantially only at a resonant frequency common to both the first and second chambers and/or harmonics of the resonant frequency, the sound in the first chamber having a phase difference from the sound in the second chamber; and
a phase adjustment circuit for adjusting the relative phases of sound generated in the first and second chambers so as to emit sound into the environmental air at approximately the same phase.
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Abstract
An audible alarm has first and second acoustic chambers that deliver sound to respective first and second horns. A phase adjustment circuit for delays the phase of sound generated in one of the two chambers so that sound emerging from the two horns is delivered with the same phase and same frequency, and emerging sound from the two horns is additive.
28 Citations
16 Claims
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1. A sound generating device comprising:
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a first acoustic chamber;
a second acoustic chamber;
a plate interposed between the first and second acoustic, the plate being capable of being vibrationally excited and operative to generate sound in the first and second acoustic chambers substantially only at a resonant frequency common to both the first and second chambers and/or harmonics of the resonant frequency, the sound in the first chamber having a phase difference from the sound in the second chamber; and
a phase adjustment circuit for adjusting the relative phases of sound generated in the first and second chambers so as to emit sound into the environmental air at approximately the same phase. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 11, 12, 13, 14, 15)
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8. A sound generating device as recited in 5, wherein the geometry of the sound conduit varies along the length of the sound conduit.
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10. A sound generating device as recited in 6, wherein the geometry of the sound conduit varies along the length of the sound conduit.
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16. A sound generating device comprising:
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a first acoustic chamber, a second acoustic chamber;
a plate interposed between the first and second acoustic, the plate being capable of being vibrationally excited and operative to generate sound in the first and second acoustic chambers substantially only at a resonant frequency common to both the first and second chambers and/or harmonics of the resonant frequency, the sound in the first chamber having a phase difference from the sound in the second chamber;
at least one resonance stabilization circuit for stabilizing the resonating sound generated in the first and second chambers so as to maintain a resonant air column over a range of variably occurring conditions due to manufacturing, temperature, pressure and the like; and
a phase adjustment circuit for adjusting the relative phases of sound generated in the first and second chambers so as to emit sound into the environmental air at approximately the same phase.
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Specification