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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to
improvement of a loudspeaker system, and more particularly to a loudspeaker system in which
energy (acoustic power) in a listening space is flattened. (Prior Art) Conventionally, a system as
shown in FIG. 8 equipped with a bass speaker, a treble speaker, and a passive radiator is known.
0 In FIG. 8, 14 is a speaker cabinet, '1, 2.15. The speaker cabinet 140 has an opening disposed
on the surface of the speaker cabinet 140, a high-pitched speaker and a passive radiator, and the
emission axes of the speaker 1.2 and the passive radiator 15 coincide with the front direction of
the cabinet. Then, electrical signals divided into reproducible bands of the respective speakers
are applied to the bass speaker 1 and the treble speaker 2 by a network circuit (not shown). FIG.
9 shows sound pressure frequency characteristics of the speaker system of FIG. 8, wherein 16 is
for bass and 17 is frequency-temporality due to direct sound in an anechoic chamber emitted
from a high sound speaker. (Problems to be Solved by the Invention) In the room actually used
by the user, not only the direct sound but also the indirect sound due to the reflection of the
ceiling or wall of the room is heard. Therefore, it is desirable for the speaker system that the
sound pressure of the sum of the direct sound and the indirect sound be constant independently
of the frequency, but it is well known that the <directive becomes sharper as the reproduction
frequency becomes higher. The amount of indirect sound decreases as the playback frequency
increases. If this is considered as sound power (an integral value of sound pressure level in a
virtual spherical surface centering on a sound source), as shown in FIG. 10, the sound power
decreases from the frequency where directivity starts to be turn into. The frequency at which this
sound power decreases is f ? ? c / 2?a (where C0 sound speed a: effective radius of vibration
of the bass speaker). The reduction of the sound power level near the over frequency is not
preferable because the sound omission is a phenomenon on the auditory sense. In the present
invention, the indirect sound in the frequency band in which the sound power level decreases is
proposed to be increased by $ 11.1. (Means for Solving the Problems) In the speaker system, the
present invention is constructed on the surface other than the baffle surface to which the speaker
is attached, such that the resonance frequency f of the Bassiply epradiator is f ? c / 2a?. It is a
thing. (Function) Therefore, the indirect sound in the frequency band in which the sound power
level decreases is increased by the sound pressure inside the speaker system, and the badge
brushator resonating at the high frequency in the preset high frequency area of the vibration
plane of the passive radiator. It is.
(Embodiment) An embodiment applied to a speaker system will be described below as an
embodiment of the present invention. In FIG. 1, 1 ░ 2 is identical to that shown in FIG. In the
mounting of the passive radiator 15 provided on the cabinet 14, the opening is changed to a rear
plate, and the passive radiator 3 according to the present embodiment is installed substantially
facing the bass speaker 1. The passive radiator 3 has a configuration shown in FIG. 2 and is
formed by laminating a film-like material 3C on the surface of a diaphragm 3d made of a rigid
material. The diaphragm 3d made of a material having high rigidity has holes corresponding to
the portions forming the middle and high frequency passive radiators, and the film-shaped
material 3C in this portion is thermally shaped by the edge portion and vibration by
thermoforming A second passive radiator 3r provided with a plate portion and a third passive
radiator 3e are provided. An edge 3b is attached to the outer peripheral portion of the diaphragm
and is fixed to the frame 3a, and one having a gasket 3g on the outer peripheral portion of the
frame 3a is attached to the cabinet 4. In the above-described configuration, the passive radiator 3
is designed to increase the sound pressure level in the low range, as is well known, in accordance
with the specification of the bass speaker 1 and the volume of the cabinet 4. The second and
third passive radiators 3 f and 3 e on the diaphragm surface of the passive radiator 3 are
radiated to the inside of the cabinet 4 from the rear surface of the diaphragm 1 of the bass
speaker 1. The second and third passive radiators 3f and '3e are configured to emit sound to the
outside, resonating with the high-pressure partial pressure. In the present embodiment, as shown
in FIG. 2, the passive power generator 3f of the second acoustic power level is provided due to
deterioration of directivity, and the third passive power generator 3e resonates at a frequency
slightly lower than the crossover frequency with the high sound speaker. Install The sound
pressure frequency characteristic obtained by the rose / brush eater 3 is as shown by 12 in FIG.
7, and the sound pressure level in the middle and high regions is raised by the characteristic 13
of the conventional passive radiator. The sound in the high range and the high range obtained by
the passive radiator of the present embodiment is radiated in the direction opposite to the
listening direction, and is reflected on the wall surface etc. in the room in a complicated manner
to reach the listener as indirect sound. Sound is improved and the acoustic power characteristics
are flattened. As another embodiment, the badge brush ator provided on the surface of the
shaking / moving plate of the rose / brancher 3 may be arranged concentrically as shown in FIG.
3 with the cross section of FIG. 3 a. Further, as shown in FIG. 4, the diaphragm may be formed of
a flat plate.
In these, the diaphragm 3d is formed of a rigid material, and the stiffness is adjusted so that the
edge 3h resonates at ffc / 2?a. Similarly, a plurality of passive radiators according to the present
embodiment may be installed on the inclined surface of the enclosure formed of the inclined side
surface plate and the upper surface plate, and may be radiated in multiple directions. As an
application example, the present invention may be applied to the sound output portion of the
electronic musical instrument shown in FIG. In FIG. 5, the speaker 6 is installed on the bottom of
the housing 7 as is well known to allow the performer to listen to it using the diffraction effect
and the reflected sound from the floor, in order to obtain the sound field originally possessed by
the instrument. The passive radiator 3 of the present embodiment is disposed above the
keyboard surface formed of the keyboard 8 substantially facing the speaker 6. The acoustic
power characteristic obtained by this method is shown by the characteristic 10 of FIG. 6 and the
acoustic power characteristic by the above-mentioned conventional method is shown by 11. In
the application example, while the high-range sound is directly heard by the player while being
radiated from the passive radiator 3, the sound which has conventionally become a problem in
the case of a sound source including many string sounds such as a piano sound. The omission is
improved and the fidelity is improved. The speaker 6 may be installed on the back surface plate
of the housing 7 or may be installed on the bottom and the back surface 1, and the installation
places of the speaker 6 and the passive radiator 3 of the application example shown in FIG. . In
this case, the same effect as the effect shown in the embodiment of FIG. 1 can be obtained.
(Effects of the Invention) According to the present invention, the reduction of indirect sound at a
specific frequency can be prevented in the listening space, good reproduction with less sound
omission is possible, and it is extremely useful in practice.
Brief description of the drawings
FIG. 1 is a perspective view of a speaker system showing an embodiment of the present
invention, FIG. 2 a is a sectional view of a passive radiator used in the embodiment of the present
invention, b is a front view thereof, and FIG. FIG. 4 is a cross-sectional view showing another
embodiment of the passive radiator used in the invention, FIG. 4 is a cross-sectional view
showing still another embodiment, and FIG. 5 is an application example of the present invention
applied to an electronic musical instrument 6 is a sound power frequency characteristic diagram
of the same, FIG. 7f, 2a, b a sound pressure frequency characteristic diagram of the passive
radiator, FIG. 8 is a perspective view of a conventional speaker system, 9 The figure is the sound
pressure frequency characteristic diagram, and FIG. 10 is the sound power characteristic
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Fig.7 Shoulder J tile clearance (Hz) temporary employment (during Fig.8 Fig.9 Fig.10
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