Electroacoustic transducer
AssigneeTaiyo Yuden Co., Ltd.
InventorsShigeo Ishii, Hiroshi Hamada, Yutaka Doshida, Takashi Tomita
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Abstract
An electroacoustic transducer includes a dynamic speaker that generates a first acoustic sound, and a piezoelectric speaker that generates a second acoustic sound. The sum of the sound pressures of the first and second acoustic sounds in a crossover frequency range of the sound pressure of the first acoustic sound and the sound pressure of the second acoustic sound, is adjusted to be equal to or greater than 0.5 times the sound pressure of the first acoustic sound in the crossover frequency range so as to improve the acoustic properties in the crossover frequency range.
Claims13
An electroacoustic transducer comprising:
- a dynamic speaker that generates a first acoustic sound;
- and
- a piezoelectric speaker that generates a second acoustic sound;
- wherein a sum of sound pressures of the first and second acoustic sounds in a crossover frequency range of a sound pressure of the first acoustic sound and a sound pressure of the second acoustic sound, is equal to or greater than 0.5 times the sound pressure of the first acoustic sound in the crossover frequency range.
An electroacoustic transducer comprising:
- a dynamic speaker that generates a first acoustic sound;
- and
- a piezoelectric speaker that generates a second acoustic sound;
- wherein a reproduced sound of the first acoustic sound and a reproduced sound of the second acoustic sound have a crossover frequency range, and the reproduced sound of the first acoustic sound has a phase (θ1) and the reproduced sound of the second acoustic sound has a phase (θ2) in the crossover frequency range, the phase (θ1) and the phase (θ2) being such that index α is 0.5 or greater where
- α≡{(cos θ1+cos θ2)2+(sin θ1+sin θ2)2}1/2
- wherein α=2 when θ1=θ2, and α=0 when θ1=θ2+π.
A method of tuning acoustic properties of an electroacoustic transducer comprising:
- a dynamic speaker that generates a first acoustic sound;
- and a piezoelectric speaker that generates a second acoustic sound, wherein a reproduced sound of the first acoustic sound and a reproduced sound of the second acoustic sound have a crossover frequency range,
- said method comprising:
- (i) determining a phase (θ1) of the reproduced sound of the first acoustic sound and a phase (θ2) of the reproduced sound of the second acoustic sound in the crossover frequency range, and
- (ii) adjusting a configuration of the dynamic speaker and/or a configuration of the piezoelectric speaker in a manner satisfying index α is 0.5 or greater where
- α≡{(cos θ1+cos θ2)2+(sin θ1+sin θ2)2}1/2
- wherein α=2 when θ1=θ2, and α=0 when θ1=θ2+π.
Dependencies are inferred from the claim text.