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DESCRIPTION JPS5491121

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DESCRIPTION JPS5491121
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of the noise filter of the
present invention, FIG. 2 is a side sectional view of the same filter, FIG. 3 is a graph showing
experimental data, FIG. It is a perspective view of a radio case which has an example filter. 1 ......
speaker, 5 ...... filter plate, 6 ...... central hole, 7 ...... hole, 8 ...... stay, 9 ', ·····Shield.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a noise filter with
improved intelligibility so that the voice from the speaker can be clearly heard. In the past, when
a speaker was incorporated into a radio or other acoustic product, the outside of the speaker had
a framework of a net and a case for dust protection. In general (1) si "q", when reproducing the
sound by the speaker, the high frequency sound not related to the sound frequency is
simultaneously reproduced. Therefore, the noise of the high range sound to the voiced sound
from the speaker. Scratch sounds etc. were included, the intelligibility was very bad, and it was
not preferable for reproducing only the sound. An object of the present invention is to provide a
filter on the front of a speaker for sound reproduction to weaken high frequency tones other
than the sound and also to facilitate the incorporation of the filter into a radio or the like. Next,
an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG.
The speaker is housed in a cylindrical housing 2, and the moving plate 3 of the speaker 1 is
located on the opening surface of the housing 2. The housing 2 is for the purpose of weakening
the low range of the speaker vocal sound and for the convenience of the arrangement of the
speaker l. The diaphragm 3 of the speaker 1 is covered by fitting the cylindrical filter 4 to the
housing 2. The surface of the filter 4 facing the diaphragm 3 of the speaker 1 is formed on a flat
filter plate 5, a central hole 6 is provided in the center (2) of the filter plate 5, and the outer
periphery of the central hole 6. There are a number of holes 7 through which sound waves pass.
Four stays 8 extending in the axial direction are provided at equal intervals on the inner
periphery of the central hole 6 of the filter plate 5, and the shield plate 9 is attached to the inner
end of the stay 8. That is, the shielding plate 9 is located in the middle of the vibrating portion of
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the speaker 1 and the filter plate 5, and an annular through hole 10 through which sound waves
pass is formed between the outer periphery of the shielding plate 9 and the central hole 6. The
shielding plate 9 is formed of a central hole 6 and a disc having a substantially concave diameter,
and a portion of the outer peripheral edge of the shielding plate 9 facing the diaphragm 3 is
scooped to prevent an adverse effect on acoustics. A large number of prismatic projections 11
are provided at equal intervals on the periphery of the central hole 6 on the outer surface of the
filter plate 5 so that sound waves can be spread radially between the projections 11 to enhance
the acoustic effect. . Outside the filter plate 5, a dustproof net 12 and an opening frame 13 of the
case are disposed. When the filter 4 having the above configuration is provided on the front
surface of the speaker 1, when the vibrating portion of the speaker l is manually operated, the
sound wave is spread on the shielding plate 9 radially through the through hole lO and the
central hole 6 (3) spread outward through the center hole 6, or after passing through the central
hole 6, further spread outward between the projections 11.
Further, the sound wave expanded by the shielding plate 9 or the sound wave generated from the
outer peripheral portion of the diaphragm 3 is spread outward through the hole 7 of the filter
plate 5. Thus, while the sound waves generated from the speaker 1 spread outward through the
respective paths, only the high sound range of the sound waves is weakened. The above results
will be described with reference to the measurement value graph of FIG. 3 based on the
experimental results. When the filter of the present invention is used (dotted line in the graph), it
is proved to be 3 dB to 10 dB weaker in the high frequency range between 7000 Hz and 17.0. In
the graph, the solid line indicates the case where no filter is used. That is, since the sound wave is
weakened only in the treble range, the treble range is weakened even if the sound from the
speaker 1 includes the noise of the treble range etc., and the reproduction sound of the voice
uttered by a person is heard, It can be heard very clearly. Next, an embodiment in which the filter
4 is integrally formed with a case such as a radio will be described with reference to FIG. (4) In
this case, the filter plate 5, the stay 8, the shielding plate 9, and the projecting piece 11 are
integrally formed with the case 14 made of synthetic resin such as a radio, and the speaker 1 is
inserted into the cylindrical housing 15. The front surface of the housing 15 is mounted to abut
on the filter plate 5. Therefore, in this embodiment, in addition to being able to weaken the high
frequency range of the retrograde sound of the above-mentioned effect, it is possible to easily
manufacture and assemble the filter.
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