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JPS4925497

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DESCRIPTION JPS4925497
■ Directive speaker device 特 願 Japanese Patent Application No. 44-28065 [Phase] Application
No. 44 (1969) April 11 @ Inventor Hideo Suzuki Hideo Koriyama City Sakaemachi 2 25% of
Mitsubishi Electric stock% formula ■ Applicant Mitsubishi Electric Corporation Tokyo 2 30
agents of Marunouchi, Chiyoda Ward, Tokyo
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a conventional
directional speaker, FIG. 2 is an explanatory view of sound pressure distribution in the
longitudinal direction of the directional speaker of the present invention, and FIG. FIG. 4 is a
pressure distribution diagram, FIG. 4 is a connection diagram of a speaker showing an
embodiment of the present invention, and FIG. 5 is a front view of a speaker cabinet according to
another embodiment.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a directional speaker device, and in particular, to provide sharp directivity in the low
frequency range without increasing the size of the device. Conventional directional speaker
devices are generally arranged in the vertical direction as shown in FIG. 1, and the directivity in
the low-pitch range is determined by the length of the speaker device. There was no way to
sharpen the directivity of the bass region than to increase its size. The present invention is
intended to sharpen the directivity of the sound pressure of the bass region without increasing
the size of the speaker device, and the sound pressure will be described prior to the description
of the present invention. Let's consider the directivity in the case of continuous distribution. First,
the directivity of a straight [111111] continuous sound source having a length t as shown in FIG.
2A can be expressed by the following equation. DI (θ) -sin (π / λ, ff5 in (θ) / π / λ, /, 5 in
(θ) (1) where λ is the wavelength of the sound wave, t is the length of the sound source, θ
Indicates the angle. Further, as shown in FIG. 2, the directivity of the sound pressure distribution
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in which the intensity of the sound source is zero at the center and linearly increases toward the
periphery is expressed by the following equation. D 2 (θ) = 2 sin (π / λ 5 in (θ)) / π / λ 5 in
(θ) -sin 2 (π / 2 λ, ff 5 in (θ)) / (π / 2 λ, ff sin (θ)) 2. (2) The above equation is obtained by
setting = IX1. Fig. 3 shows directivity (Dt) according to (1) and (2) above. The curve obtained
based on the calculation results when 3D2 (θ) is t / λ-%% 1 is a solid line curve, (θ), a dotted
line is D2 (θ), and the sound pressure on the front axis The sound pressure in each direction
when 1 is 1 is shown. It can be seen from FIG. 3 that D2 (θ) has a sharper directivity than DI (θ)
for all of a, b and c. Also, D2 (.theta.) At t / .lambda.-3 / 4 and Dl (.theta.) At t / .lambda. = 1 show
almost the same directivity. This means that the directional speaker having the sound pressure
distribution shown in FIG. 2 can obtain approximately the same degree of directivity as the
conventional directional speaker [111111] EndPage: 1/3 of the force of the beam. Is an indicator
of Thus, it has become clear that the directional speaker having the sound pressure distribution
shown in FIG. 2 has improved directivity characteristics in the low frequency range, but the
change in sound pressure in the longitudinal direction is linear here. The same thing can be said
as long as the sound pressure distribution increases as it goes to the end.
The present invention is based on the above analysis. As shown in FIG. 4, a resistor R or the like
is connected in series to each speaker S of the conventional directional speaker device and the
sound pressure is increased from the center to the end The resistance value is set such that Ra>
R2> R1> Ro so that Further, as shown in FIG. 5, the vibration B of the flat loudspeaker is
broadened so that the sound pressure becomes larger as it goes from the center to the end. In the
present invention, the sound 5 pressure is increased from the center to the end in the
longitudinal direction of the directional speaker device as described above, so that the sound
pressure distribution as shown in FIG. As described in FIG. 3, the directivity characteristics in the
low pressure region are improved, and the invention is a useful invention capable of making the
directivity of the low frequency region sharper than that of the conventional one. 10
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