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JPS5353320

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DESCRIPTION JPS5353320
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing how to determine the
horn area of a conventional horn speaker, FIG. 2 is an explanatory view showing a wavefront
shape obtained by measuring a wavefront in the horn, and FIG. It is explanatory drawing for
calculating the horn shape of the horn speaker which concerns.
DETAILED DESCRIPTION OF THE INVENTION The present invention aims to improve the
directional characteristics and the sound pressure frequency characteristics of a horn speaker. In
the conventional horn speaker, it is assumed that the wave front of the sound in the horn is 7.7
иии, and the wave front of -7-2 gou is a plane wave, taking a horn area. As shown in Fig. 1, the horn
area S is S = Soe "! (1) (Here, So--horn throat area, m)) 2 horn's spread coefficient, x "'"' horn
throw 3 (2 (computed as length from gutter plane). However, when the wavefront in the horn is
measured, it is close to a spherical wave as shown in FIG. Therefore, in order to correctly
propagate the sound in the horn, it is necessary to correct how to take the area of the horn along
the actual wavefront. That is, the shape of the horn must be matched to that. The present
invention has been made in view of the foregoing points, and will be described below with
reference to FIGS. 2 and 3. Now, in FIG. 2, the wavefront is a part of a circular arc of radius H "%
& I, -Cf, JJ", -th (-1 'cOF "3 * o Drfp-Ll,. ??? ????????? If this point Q is regarded as
an apparent acoustic center of a spherical wave, the horn area can be calculated by taking a
spherical shape centered on this point O. In FIG. 3, when the acoustic center is set to 0 point, the
horn area S at an arbitrary length X from the horn throat surface is S-two Soam! = 2?h (x k k)--(2) (where h: height of the spherical surface, k ... acoustic center) Circle with a length 3R from the
point 3o to the horn throat surface as a radius The equation of x + Y 2 R R 2 и и и и и и (3) X = R-h =
(x + k)-If the value of y in h is y, then i (x k k)-h12 + y2 = ( x ten k) 2 * '* Y2 = h (2 (x + k)-hl--f 4)
From the above equation (2), oem X h = 2 pi (x + k) which is substituted into the above equation
(4) is-) The horn shape can be determined from the above equation (5). That is, the horn of the
present invention can be obtained by determining y from the above equation (5). Assuming that
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the wave front in the horn is a plane wave as in the conventional Pone design, A = S, mx, l и иииииииии
(@ and 1, A ? 7 n g flat or the horn of the present invention It is a correction term by design. In
fact, the horn of the present invention is y or slightly smaller than that of the prior art due to the
difference between the above +51 and +6).
In the present invention, since the horn shape along the actual wavefront can be realized by
using the above equation (5), the propagation of the sound in the horn is correctly performed,
and the flatness of the sound pressure frequency characteristic is improved. It is a thing.
Furthermore, since the wavefront is closer to a spherical wave, the homology characteristic is
improved.
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