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JPS6278996

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DESCRIPTION JPS6278996
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker horn incorporated in an
electroacoustic transducer. A structure as shown in Japanese Patent Publication No. 58-3436 has
been proposed for the purpose of making constant and flatten the sound pressure characteristic
pattern in the conventional technology-oriented office. In addition, there are pie radials, mantles,
twin vessels, CD horns and so on. Problems to be Solved by the Invention The shapes of these
horns have a drawback that it is difficult to obtain a constant sound pressure characteristic
pattern in the pointing station because the side walls of the horn are formed by a plurality of
functions. The present invention aims at making the sound pressure directional characteristic
pattern in the directional point constant 7 and obtaining a wider directional angle. SUMMARY OF
THE INVENTION In order to solve the above problems, the present invention satisfies the above
object by setting the tangent angle of the side wall curve of the throat of the horn (half apex
angle C) to 1/2 of the target pointing angle. It is assumed that (l + αχ). Here, α0 is the
dimension of the throat, αχ is the dimension of the cross section of the distance χ from the
throat, and α = wide is the coefficient. The sound pressure directivity pattern in the pointing
station largely depends on the side wall function, and a horn having a plurality of functions
combined has a change in the characteristic pattern at a frequency determined by its shape and
distance, and is less stable. In the Bessel function, the side wall becomes straight with n = 4, the
directivity angle becomes narrow at a frequency of α: =: 450 / 2θ, and peaks and valleys occur
in the sound pressure directivity characteristic pattern in the high region. If the Bessel function
approaches n → flash, it approaches an exponential function and the directivity angle changes
with frequency and does not become constant. Among them, when n = 4 of the Bessel function,
the change of the directivity angle in the frequency is the smallest, and these make the tangent
angle of the opening end approximately the same as the target directivity angle-(90 By setting it
as −), the directivity pattern can be stabilized. The target pointing angle is substantially
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1
determined by the tangent angle of the horn. The sound pressure directivity characteristic
pattern of the horn having the side wall determined by αχ = αa (1 + αχ) can obtain a
constant sound pressure directivity characteristic pattern at a wide directivity angle with a
substantially flat and small deviation. Embodiment 1: The side wall curve of the present invention
is shown in FIG. 1. The objective directivity angle 2θ6 having a flat sound pressure
characteristic is paired 1-1 with θ1 1/2 (2θo), θ2 2θ0 (where 2θO is 90). A curve
connecting the value of α of χrχn is taken as αχ = αο (t + αχ) 4 as it exceeds 90 °).
Here, the width of α is larger than the coefficient. The constant is set so as to connect α n at 79
o'clock, and it is set as a function.
As shown in FIG. 2, the sound pressure directivity characteristic pattern obtained by the horn
obtained in the above manner is such that the deviation in each frequency within the target
directivity angle is small and constant. As a comparison with the prior art, FIG. 3 shows the
sidewall shape of αχ = a * (1 + αχ) and its sound pressure directivity characteristic pattern in
FIG. The sound pressure deviation at each frequency is large and the target directivity angle is
narrowed. FIG. 6 shows the side wall shape in which a plurality of functions are spliced together
and the directivity characteristic pattern thereof. Although the sound pressure deviation of each
frequency decreases near the target pointing angle, there is a sound pressure deviation in the
target pointing place. FIG. 8 shows the sidewall shape of the Hoy of αχ = ao (1 + αχ) 8 and
the directivity characteristic pattern thereof. The directivity characteristic pattern approximates
to an exponential function, and the directivity angle becomes narrower as the frequency becomes
higher. From the above, according to the conditions of the present invention, the speaker horn
can obtain a wider directivity angle at a constant level of the sound pressure directivity
characteristic pattern in the pointing station. Further, the target pointing angle is freely set, and
the pattern shape of the sound pressure directivity characteristic is changed according to the
memo horn shape obtained from the conditional expression of the present invention, but the
same wide pointing angle as described above can be obtained. According to the present
invention, the sound pressure deviation at each frequency within the target directivity angle can
be reduced, and uniform sound pressure characteristics can be supplied to the pointing station.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a view showing a side wall curve of the present invention, and FIG. 2 shows a sound
pressure directivity characteristic pattern.
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FIGS. 3 to 8 are side wall curves of the horn for explaining the present invention in detail and a
directional characteristic pattern thereof. Fang 5 Fig. 1 Fig. 1 Fig. 2 Fig. 4 KH 7 Fig. 4 Fig. 4 90 °
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