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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
speaker system, and FIGS. 2 and 3 are cross-sectional views showing an embodiment of a speaker
system according to the present invention. In the figure, 1 is a high-pitched speaker, 2 is a bass
speaker, and 4 is an acoustic filter. In the drawings, the same reference numerals denote the
same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coaxial speaker
system in which a high-pitched speaker and a low-pitched speaker are disposed in the same
manner as desired. In a speaker device generally used, it is difficult to reproduce the necessary
reproduction band by individual speaker units, so the reproduction band is divided into several
small areas and a dedicated speaker that receives each band is used. The thing is done. Normally,
the band is divided into two or three areas. A so-called two-way or three-way speaker system is
representative. For simplicity, a two-way speaker is taken as an example. Loudspeakers that
reproduce bass and treble are called bass speakers and treble speakers. In the speaker apparatus,
there are those in which these two speakers are disposed at different positions on the baffle
surface, and those in which they are disposed on the same axis. The latter name is called a
coaxial speaker system and is distinguished from the former. The characteristic of the coaxial
speaker is that the two speakers are on the same axis, so that the localization of the sound image
is good without dispersion. The main drawback of this speaker M is that since the bass speaker
and the treble speaker are very close to each other, the reproduction sounds of the respective
speakers interfere with each other to generate cross modulation distortion. FIG. 1 is an example
of a coaxial speaker system conventionally used. il + is a treble speaker, (2) is a bass speaker, 131
is a cabinet, OU is a direct sound from the treble speaker, a whistle is a treble bass (2), a sound
from the 8y 2-car is reflected by the bass speaker It is an indirect sound that reaches the front
direction after being When the diaphragm of the bass speaker is vibrating, the indirect sound aS
becomes a sound including intermodulation distortion, which hinders good reproduction. In
order to reduce this intermodulation distortion sound, it is necessary to reduce the amount by
which the radiation sound from the high-pitched speaker reaches the diaphragm of the bass
speaker. This invention aims to eliminate the above-mentioned drawbacks of the prior art. FIG. 2
shows an embodiment of the present invention. A different point from FIG. 1 is that in order for
the sound from the high-pitched speaker to reach the diaphragm of the low-pitched speaker, it is
necessary to pass an acoustic filter (41). Here, the acoustic filter (4) means a low pass filter such
that the bass passage loss is small and the treble is large. The indirect sound 0 at this time has to
pass through the acoustic filter twice as shown in FIG. 2, and the attenuation becomes very large.
For this reason, it is possible to reduce intermodulation distortion by the diaphragm of the bass
speaker as much as possible (3).
FIG. 3 shows another embodiment of the present invention. A horn type is used for the highpitched speaker, and a part of the magnetic circuit of the bass speaker plays a role of the horn.
Also in this case, the high-pitched speaker and the low-pitched speaker are acoustically coupled
only through the acoustic filter 141. Particularly in this embodiment, the acoustic filter (4) forms
a part of the horn. Also in the present invention, a component of the high frequency sound
emitted by the high frequency speaker, which is modulated by the diaphragm of the low
frequency speaker, must pass twice through the noble filter, and the attenuation is very large. For
these reasons, it is easily known that intermodulation distortion is significantly reduced also in
this embodiment. Since the acoustic filter faces the bass diaphragm, it is necessary to have
sufficient mechanical strength so as not to be shaken at a low frequency. -For example, it is
sufficient to pass low tones such as punched metal, etc. and to have sufficient strength. Since the
present invention is performed as described above, intermodulation distortion can be achieved
with a simple configuration.
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