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Patent Office Secretary 1, Title of Invention ■ Japanese Patent Application Laid-Open No. 5039j, No. 23 in the Office, basss Description 1, Title of Invention 1, Name of Invention Synthesis of
sound wave h
Synthesizer 2 of on noinogo → isochi 'sound wave, the number of inventions described in the
claims; 4 Name Hiroshi Kumagai [phase] Japan Patent Office
2 Detailed Description of the Invention In the present invention, sound waves emitted from a
plurality of sound sources are positive in air! It relates to an apparatus for accurate synthesis. In
particular, the present invention relates to a small-sized speaker apparatus having a good
response in a frequency range of 20 to 300 H 2 by making a plurality of small-sized speakers
face each other. There is a problem that the sound pressure of the bass is extremely low at the
time of operation in a model having a small size of the diaphragm and a small output at EndPage:
1 for all withdrawn speakers as well as the crystal and dynamic types. The synthesizer according
to the present invention solves this problem mainly by making the two diaphragms face each
other to efficiently increase the sound pressure in a very narrow synthetic space and to make the
two sound sources approach one another. Solves the conventional problems by completely
polymerizing and synthesizing the sound waves from the two sound sources. For this reason, it is
possible to intensify the bass with a small speaker, and it becomes possible to reproduce the bass
with an inexpensive small speaker without using an expensive large speaker. A description will
be given of the embodiment of the present invention. The mounting plates 9 of the housing 1 are
arranged such that the dynamic type or Li stall type speakers 2 and 3 are separated by the
maximum distance. And 10 places. The dimensions, models, and physical properties of the two
speakers should not be as close as possible. The sound from the front surface of the diaphragm 5
is radiated from the radiation holes 6 provided in each mounting plate. In the area of the
radiation hole, the sound wave is synthesized in the space surrounded by the vibration rear wall
12 and the side wall 13. A sound absorbing material having appropriate sound absorption is
applied to the wall surface exposed to the synthetic space. When the voltage from the output
circuit is applied to both speakers and driven so that the phase, amplitude and waveform are
equal to one another, two special phenomena occur. First, when both speakers maintain a
maximum distance sufficiently small compared to the dimensions of the diaphragm, the
wavelength of the sound wave, etc., the diaphragms of both speakers are simultaneously air in
the synthetic space because the phases are equal. The sound pressure that is about 5 to 20 dB
greater than when two speakers are attached to the same wall is obtained and compressed from
the open lower. Second, because the diaphragms of both speakers are close to each other, the
sound waves emitted from the two sound sources completely overlap in the air and are
synthesized and become large, and the synthesis point P is It propagates as a radiated sound
wave 8 from a single sound source. The sound waves radiated through the holes 4 in the frame
11 of each speaker are phase-reversed sound waves emitted from the back surface of the
diaphragm, but the sound waves are isolated by the housing 1 having sound absorption and
sound insulation.
As shown in FIG. 3, in the example shown in the housing IA, the side wall 13 can be shortened
and a side opening 14 can be provided to change the directivity. Furthermore, as another
embodiment, as shown in FIG. 5, the mounting plate 9 and the lo'B are made to face each other at
a specific angle (8 to 60 degrees) in the housing IB by the side walls 13 on both sides and the
mounting plate. It is also possible to create a horn-shaped synthetic space and emit sound waves
from the open lower B. As still another embodiment, mounting plates 90 and 100 are inclined
and fixed to the housing IC as shown in FIG. 6, and side walls are provided so that the sound
waves from the synthetic space are not horizontal via the open lower C. The sound waves of the
reverse phase emitted downward and emitted from the back of each diaphragm pass through the
horn-like sound path 25-formed by the inclined sound paths 15 and 16 and the side walls.
During this time, the phase is reversed, and through synthetic aperture AK through the opening
18, the sound wave emitted from the open lower C and one point A are completely combined. In
this case, theoretical values corresponding to four times the sound pressure obtained by the two
speakers mounted on the vertical wall are obtained. In addition, by providing the appropriate
number of through holes 17, it is possible to reverse the phase not only in the bass but also in
the middle by changing the substantial length of the sound path. As another example, even if the
speaker 3 in the same figure is removed and the radiation hole 26 is closed to use only one
speaker, the sound wave passing through the sound path 25 for phase inversion is at the
synthetic focus A. The sound pressure of the bass increases because the sound is completely
synthesized. In the conventional phase-reversed cabinet, since the phase-reversed sound wave is
emitted from the lower side of the cabinet, the distance to the streak beaker becomes large and it
is not synthesized in the air, so that the sound pressure is limited Does not rise, it has the
disadvantage that at other positions the phase difference source-wakes up in a systematic
manner. In the present invention, since the sound source is a single sound i, uniform sound
pressure can be obtained at any position in the room. Although two speakers are used in the
present invention, EndPage: The correction circuit shown in FIG. 7 can be used to correct various
characteristics of the two speakers because they are not always the same. it can. The low
frequency signal input to the input terminal 19 is amplified by the amplifier circuit 20 and
further connected to the speaker 3 through the amplifier circuit 24 at the subsequent stage, and
for the speaker 2 there is a fixed resistor r1 capacitor C1 variable resistor R It is also possible to
connect the phase adjustment circuit 21, the sound quality amplitude adjustment circuit 2 and
the amplification circuit 23 to precisely adjust the phase, amplitude, etc. to selectively adjust the
desired synthetic sound wave frequency range.
As described above in detail, the present invention is to perform high-power and low-pitched
sound reproduction with a low cost and small size skater, and provides an effective means for
improving the sound quality of small size audio equipment.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view showing a combining
apparatus provided in the housing 1 of the present invention, FIG. 2 is a front view thereof, FIG. 3
is a front view showing an example of a housing LA, FIG. 5 is a sectional view showing the
construction of the housing IB as another embodiment, FIG. 6 is a sectional view showing the
construction of a phase reversal type housing 1c as another Q embodiment, FIG. FIG. 7 is a block
diagram showing a correction circuit for correcting and adjusting various characteristics of the
speaker, and housing 1, IA to IC 1 speakers 2 and 3, diaphragm 5, open lower, 7A to 70. FIG.
Mounting plates 9.9A-9c1 and 10, IOA-10, sound path 25, synthetic focus A are shown. Patent
assignee-Kuma 'Thiro Hiroshi' 2 EndPage: 3
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description, jps5039123
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