JPS5552694

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DESCRIPTION JPS5552694
Description 1, title of the invention
スピーカシステム
3. Detailed Description of the Invention The present invention relates to a speaker system used in
a so-called 3D system, which is a system of stereo reproduction. The so-called 3D system in
stereo reproduction is a system that perceives a sense of direction and reproduces only the left
side and the right side together from the single woofer of K 参 i # I 11100 to 150 Hz. 1aU shows
a speaker system that plays the middle to high tones of the left channel, and the same (lb
indicates a speaker system that plays the middle to high tones of the right channel. And 2 is a
speaker system which reproduces ¦ regenerates the signal which synthesize ¦ combined a 100150 ratio or less inner side channel. In such a 3D system, it is necessary to take out the signal of
the sum of left and right channels. Therefore, conventionally, as shown in FIG. 2, the left and
right mixing circuits are inserted after the noise amplifier, and the t4 word amplifier dedicated to
the low frequency band is used separately. That is, in FIG. 2, the serial f3m output of the left
channel and the output of the Noria amplifier 3b of the right channel are introduced into the
mixing circuit 4 respectively at 'g · 2EndPage: 1, and after being synthesized there, The speaker
system 2 is driven by acquiring a low frequency band signal of ˜159 Hz and amplifying the low
frequency band signal with a low frequency band dedicated + power band. Also, in the left
channel, the signal of the middle to high range is transmitted from the Glian f3a to the bypass
filter 5a, where the signal of the middle to high range is extracted. The mid-to-high range signal
is amplified by the power unmixing signal a, and then the speaker system 1a is driven. Similarly,
in the right channel, the output of the serial 7'3b is sent to the high / gus filter 5b where the midhigh range signal is picked up. This middle-to-high range signal is amplified by the non-mother
Waran f7b and drives the speaker system 1b. The case of FIG. 3 shows the case where a
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combining transformer is used in place of the mixing circuit 4 in FIG. 2, and the signal input to
the combining transformer 8 is the output of the Gli amplifier 3a as the power amplifier 7a of the
left channel. , And to the synthesis transformer 8 through the loop 7b. Then, the output of the
synthesizing transformer 8 is taken out through a mouth / 4's filter to take out a low frequency
signal, and the speaker system 2 is driven by this low frequency signal. In the middle and high
range, both left and right channels receive the output of the woares 7a and 7b, respectively, and
through the filters 5a and 5bt, take out the middle and high range, respectively, and the speaker
system 1a is used according to this signal. .
It is designed to drive 1b. In the case of the conventional 3D system shown in FIG. 2 above, the
mixing circuit 4 and another yawg 7C are required, and it becomes expensive. Depending on the
configuration of the mixing circuit 4, the middle to high range There is a drawback that the
crosstalk between the left and right becomes large. Further, in the conventional 3D system using
the synthetic transformer 8 of FIG. 3, in addition to the necessity of the synthetic transformer 8,
a low / master Sfiltaro 1 requires a thick f \ 4 LC element, In addition, the performance of the
composite transformer 8 has the disadvantage that the bass characteristic is a little worse and
the characteristic is deteriorated. The present invention has been made to eliminate the abovementioned conventional drawbacks, and by attaching two woofer units to one case, the left and
right sum outputs are extracted acoustically and further By making use of only the sound
pressure radiated from the duct mounted on the same casing or from the Dronco /, a sound-like
low-pass filter can be configured to cause deterioration of sound quality simply and
inexpensively. It is an object of the present invention to provide a speaker system capable of
extracting the output of a 3D stem center channel woofer. Hereinafter, an embodiment of a
speaker system according to the present invention will be described based on the drawings. FIG.
4 is a cross-sectional view showing the structure of one embodiment. In FIG. 4, 9.10 # i
respectively show the woofer units, and these woofer units 9. Each of the panels 10 is attached to
the partition plate 13 in the cabinet 11. At the time of this attachment, the edges of the woofer
units 9 and 10 are attached to point to the bottom of the cabinet 11). Further, a duct 12 is
provided at a lower portion of the front surface of the cabinet 11). FIG. 5 is a block diagram of a
3u system re-ahead system in the case where the speaker system of the present invention
configured as described above is applied as a center channel 7-a system in the 31) system. In FIG.
5, the output of the amplifier 15a of the left channel is sent to the speaker system 1a which
produces mid-high range through high-t + filter 5a. Similarly, the output of the right channel
amplifier 15b is sent to the speaker system 1b that reproduces middle and high tones through
the bypass filter 5b. In the speaker system of the present invention for the low tone range shown
in FIG. 4 of 14 companies, the output of EndPage: 2 Anne 7 '1158 of the left channel is directly
sent to the woofer unit 9 on the left, The '15b output is sent directly to the woofer unit 10 on the
right.
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In this way, the output of the amplifier 15a of the left channel is extracted from the bypass filter
5aK and the signal of the middle to high frequency range component to drive the speaker system
1a and at the same time the output of the channel 7'15'b of the right channel. The signal of the
middle-high range component is extracted by the bypass filter 5b to drive the speaker system 1b.
The output of the left channel amplifier 15a is sent to the woofer unit 9, and the output of the
right channel a: / 7 '15b is sent to the woofer unit. As a result, audio in the bass region of both
left and right channels of 100 to 150 Hz or less is output. At this time, the sound directly
radiated from the woofer unit 9.10 is not radiated to the outside of the cabinet 11, and only the
resonance noise of the duct 12 and the cabinet 11 is radiated to the outside of the cabinet 11. In
this case, there is already a speaker system having only one woofer unit and only the resonant
sound of the duct or drone cone and the cabinet being emitted from the cabinet, and the
frequency characteristic of the radiated sound is as shown in FIG. It is known that the middle and
high range components are cut and only the low range is reproduced. However, in the speaker
system according to the present invention, to cause the resonance between the duct 12 and the
cabinet 11, the signals of the left and right channels are synthesized by two woofer units 9.10
which are inputted one by one. . The output signal of the left channel amplifier 15a is applied to
the left channel woofer unit 9, and the output signal of the right channel amplifier 15b is applied
to the right channel woofer unit 10, both of which are fam- ily 9.10 This is a synthetic sound of
the radiation emitted from the low frequency band, which is the purpose of the 3D center
channel woofer. As described above, according to the speaker system of the present invention,
two woofer units are mounted in a cabinet, and the left and right channels of stereo reproduction
are separately added to these woofer units, and both woofer units are Since only the resonance
noise of the cabinet and the duct or the drone cone is radiated to the outside of the cabinet, the
mixing circuit, the low pass filter, the synthesizing transformer and the like become unnecessary
as in the prior art. Along with this, it is possible to make it easy and inexpensive, not to mention
crosstalk between the middle and high range and other factors that adversely affect the sound
quality of the whole range, but rather to create harmonics of the low range. Because it cuts into,
it is possible to reproduce extremely high quality bass range.
4. Brief description of the drawings. FIG. 1 is a diagram showing the layout of a general 3D
speaker, FIGS. 2 and 3 are block diagrams of the conventional 3D system, and FIG. 4 is a speaker
of the present invention. FIG. 5 is a block diagram showing the construction of an embodiment of
the system, FIG. 5 is a block diagram of a 3D reproduction system using the speaker system of
the present invention, and FIG. 6 is a sound radiated by resonance of a cabinet and a duct or a
drone cone. Sound pressure frequency characteristic diagram of FIG. 1a, 1b: speaker system, 5a,
5b: Hyno mother Sfilter, 9.10: woofer unit, 11: cabinets), 12: duct, 13: 9 cut Board, 14 ... speaker
system, 15a, 15b ... amplifier. In the figure, the same reference numerals indicate the same or
corresponding parts. 0 Agent Kanno Shin-'10EndPage: 3 fan iml 2 2 II 3 3111' If-4115
wEndPage: ４
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