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JPH01130697

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DESCRIPTION JPH01130697
[0001]
The present invention relates to a speaker system for improving the speaker system, and to a
speaker system in which energy (acoustic power) in the listening space is flattened.
(Conventional art) A system as shown in FIG. 7 equipped with a speaker, a high-pitched speaker
and a passive radiator is known. In FIG. 7, 74 is a speaker cabinet, +1.12.73 is a bass speaker
whose opening is disposed on the buckle surface of the speaker cabinet 74, a speaker for highpitched sound and a passive radiator, the speakers 11, 12 and The radiation axis of the passive
radiator 73 coincides with the forward direction of the cabinet. Then, to the bass speaker II and
the treble speaker 12, electric signals divided into reproducible bands of the respective speakers
are applied by a network circuit (not shown). FIG. 8 shows sound pressure frequency
characteristics of the speaker system of FIG. 7. 81 is a frequency characteristic of 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 above-mentioned direct sound but
also indirect sound due to reflection of the ceiling or wall of the room is also being listenedtherefore, the speaker system It is desirable that the sound pressure of the sum of the direct
sound and the indirect sound be constant independently of the frequency, but as is well known,
as the speaker becomes more directional as the reproduction frequency becomes higher, the
amount of indirect sound is reproduced The higher the frequency, the lower the frequency. If this
is considered by sound power (an integral value of sound pressure level in a virtual spherical
surface centering on a sound source), as shown in FIG. In particular, a reduction in sound power
level in the vicinity of the crossover frequency between the low-pitched speaker and the highpitched speaker is not preferable because it is a phenomenon in terms of hearing. The present
invention has been proposed for the purpose of increasing the indirect sound in the frequency
band where the sound power level decreases. (Means for solving problems) In the speaker
system of the present invention, a passive radiator is mounted on a surface other than the buckle
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surface on which the speaker is attached, and the diaphragm of the passive radiator has a
plurality of holes of 3 mm to 200 mm. It is what was comprised. (Function) Therefore, in the
back of the speaker radiated to the inside of the speaker system, a part of high frequency sound
is radiated through the hole of the diaphragm of the passive radiator, and the indirect sound of
the frequency band where the sound power level decreases Increases.
(Embodiment) An embodiment applied to a speaker system will be described below as an
embodiment of the present invention. In FIG. 1, 11 ° 12 is identical to that shown in FIG. In the
mounting of the passive radiator 73 provided in the cabinet 74, the opening is changed to a rear
plate, and the passive radiator 3 according to this embodiment is installed substantially opposite
to the bass speaker 11. The passive radiator 13 has a structure shown in FIG. 2, and a frame 13a
on which an edge 13b is attached to a diaphragm 13c is adhered. The gasket 13d is attached to
the cabinet 14 with the gasket 13d installed on a part of the outer side of the frame 13a. Further,
the diaphragm 13C is provided with a plurality of holes 13e. In the above-described
configuration, the passive radiator 13 is designed to be strong in the low frequency range, as is
well known, in accordance with the specification of the bass speaker 11 and the volume of the
cabinet 14. Further, the hole 13e on the diaphragm surface of the passive radiator 13 is
configured such that a part of the sound radiated to the inside of the cabinet 14 from the rear
surface of the diaphragm of the low frequency speaker 11 is radiated to the outside. There are
17 20 朋 2 holes as shown in FIG. The sound pressure frequency characteristics obtained from
this passive radiator 13 are the same as the characteristics 61 of FIG. 6, the characteristics 62 of
the conventional passive radiator without holes and the middle and high frequency sound
pressure levels Will rise. Since the high-range sound emitted 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 complex manner to reach the listener as an
indirect sound, the conventional problem Sound loss is improved and sound power
characteristics are flattened. The hole 13e provided in the diaphragm 13c of the passive radiator
13 has a suitable size of 3 m 112 or 200 m ′ ′, and the sound pressure radiation efficiency
near the resonance of the passive radiator increases when the hole is reduced or the area is
reduced. "The sound in the high region has its emission sound pressure level lowered due to the
effect of the acoustic filter and the reduction of the transmittance. Conversely, if the number and
area of the holes 13e are increased, the effect as a passive radiator is reduced, and the sound
pressure level in the middle and high regions is increased. Therefore, the acoustic power
characteristics are changed by adjusting the number and areas of the holes 13e. be able to. 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.
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In FIG. 4, in order to obtain the sound field originally possessed by the musical instrument, the
speaker 44 is installed on the bottom of the housing 41 as is well known, and a method of
making the player listen using the diffraction effect and the reflected sound from the floor The
passive radiator 13 of this embodiment is disposed above the keyboard surface formed of the
keyboard 42 substantially facing the speaker 44. The acoustic power characteristic obtained by
this method is shown by the characteristic 51 of FIG. 5 and the acoustic bar-characteristic by the
above-mentioned conventional method is shown by 52. In this application example, while the
high-range sound is heard by the player as the direct sound while being emitted from the passive
radiator 13, the conventional problem has been encountered in the case of a sound source
including a large number of strings before the string such as a piano sound. Sound loss is
improved and fidelity is improved. The speaker 44 may be installed on the bottom surface and
the rear surface 9 of the rear plate of the housing 41. Furthermore, the installation places of the
speaker 41 and the passive radiator 13 of the application example shown in FIG. 4 may be
interchanged. In this case, the same effect as the effect shown in the embodiment of FIG. 1 can be
obtained 1 (effect of the invention). According to the present invention, it is possible to reduce
indirect sound taj at a specific frequency in the listening space, and good reproduction with less
sound omission is possible, which is extremely useful in practice.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view of a speaker system showing an embodiment of the present
invention, FIG. 2 is a sectional view of a passive radiator showing an embodiment of the present
invention, and FIG. 3 is a sectional view showing the same portion. Fig. 5 shows the same
acoustic power frequency characteristics, Fig. 6 shows the sound pressure frequency
characteristics of the passive radiator shown in Fig. 3 and Fig. 3, Fig. 7 C, a perspective view of
the conventional speaker system Fig. 8 shows the same sound pressure frequency characteristics,
and Fig. 9 shows the same sound power.
11 is a speaker for low-pitched sound, 12 is a speaker for high-pitched sound, 13 is a passive
radiator according to this embodiment, 1 is a cabinet, and 73 is a conventional passive radiator.
Patent applicant Nippon Columbia Ltd. Figure 5 Figure 6
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