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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a frequency characteristic diagram of a horn
speaker according to the prior art and the present invention, FIG. 2 is a cross-sectional view of
the horn speaker according to the present invention, and FIG. 2 is a driver, 3 at 3 b is an acoustic
tube, 1 is a horn, and 3 is an acoustic filter.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a horn speaker and aims to eliminate the disturbance of the high frequency characteristic of
the horn speaker by coupling a low pass acoustic filter between the driver and the horn. It is.
Conventionally, in a multi-way speaker system having a plurality of band dedicated speakers,
each band dedicated speaker has an audio of a frequency according to the band ≦≦? A KLC
netotor is used to provide 22 signals. In such a speaker system, it is preferable that the overall
frequency custom be flat, but in reality such phenomena are generally not flat due to phenomena
that degrade the frequency characteristics of each speaker As shown in the 1st National Railways
in one of the 7 letters t; = The high peak of the ho / speaker is raised. This high-frequency peak is
due to the resonance of the second noise of the diaphragm, and the horn speaker is mainly used
for mid-tone or high-pitched sounds, so when used for mid-tones, crossover with the high-tone
speaker When high frequency peaks are generated near the frequency and the characteristics
near the crossover frequency are disturbed, distortion is generated due to the high frequency
peaks when used as a speaker for high-pitched sound, resulting in significant deterioration of
sound quality. Therefore, when designing an LC network, it is attempted to lower the high
frequency peak by reducing the power of the third or higher frequency than the frequency at
which the high frequency peak occurs and using the attenuation characteristics of the noise. As
shown in the above, the effect was not sufficient and it was difficult to improve the disorder of
the character / character. In this invention, a low frequency acoustic filter is provided between
the driver of the horn speaker and the horn to give the horn speaker unit a frequency selective
characteristic, thereby eliminating the deficiencies of the prior art, FIG. 2 will be described in
detail. In FIG. 2, 1 is a ho 7 and 2 is a driver including a magnetic circuit and a vibration system
component. The horn 1 and the driver 2 are coupled via the acoustic filter 3. The acoustic filter 3
is connected to the radiation opening of the driver 2 and is connected to the acoustic tube 3a
having a uniform cross section having substantially the same area as the opening, and the
acoustic tube 3a to have a larger cross-sectional area than the acoustic tube 8a. An acoustic tube
3b having a uniform cross section is formed, and a ho 71 is connected 4 to the surface facing the
connection of the acoustic tube 3b with the acoustic tube 3a. Assuming that the mass of the
acoustic tube 3a is m and the capacity of the acoustic tube 3b is C, the equivalent circuit of the
acoustic filter 3 becomes as shown in FIG. 3 and acts as a low pass filter of cutoff same wave
number fc- □. : GT (, rii horn acoustic load.
The characteristics of the ho / speaker having such an acoustic filter 3 are shown in FIG. 1C. In
this characteristic, A, B and C are custom made using the same horn speaker. The acoustic filters
used are the acoustic tube 3a (lOWi4: length 10 hearing) and the acoustic tube 3b (40 xie: length
Im). As is clear from this custom-made diagram, the acoustic filter significantly attenuates the
attenuation at frequencies above the cutoff frequency, and it is possible to prevent custom-made
disturbances due to high-frequency peaks, and the effect of this invention is proved. As described
above, in the horn speaker according to the present invention, the sound is taken by providing
the acoustic filter 3 consisting of two acoustic tubes 3a and 3b having uniform cross sections
with different diameters between the horn 2 and the driver 2. It is possible to effectively remove
high frequency peaks due to moving plate edge resonance, improve disturbance of
characteristics near crossover frequency, and prevent deterioration of sound quality due to high
frequency peaks. is there.