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JPS5573197

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DESCRIPTION JPS5573197
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 so-called 3D system
center channel of stereo reproduction system, a 3D system of 0 stereo reproduction concerning
improvement of a speaker system suitable for a loufer (in z, the first As shown in the figure,
middle and high pitched sounds are reproduced from the left and right speaker systems (la) *
("b), but it is difficult to perceive a sense of direction if the bass range is less than 100 to 150 Hz.
The left and right are put together and reproduced from a single center channel sonar woofer (2).
Therefore, in the 3D system, it is necessary to take out the signal of the sum of the left and right
channels. Conventionally, therefore, as shown in FIG. 2, the preamplifiers (3a) and (ab) and the
power amplifiers The left and right mixing circuits (41, bypass filters (5a), (5b), low pass filter
(6a), and low-pass power amplifier (7c) are inserted between them, as shown in FIG. Between the
ya), (71)) and the bypass filter (5a), (sb), a synthesis transformer (81, low pass filter (6a) G) is
inserted, but in any case EndPage: 1 also has a special circuit Not only does it require a separate
power amplifier or transformer, which increases the cost, but depending on the configuration of
the mixing circuit, the amount of crosstalk between the left and right is large up to the middle or
high temperature Or Tsu, also, one in which the transformer performance is poor, such as bass
characteristics deteriorate, there is a risk that lead to a deterioration of the characteristics. The
present invention seeks to obtain a loudspeaker system suitable for a center channel woofer
which does not have the above drawbacks. The present invention therefore uses the speaker unit
with two independent Whist coils, to which the applicant has previously filed, to add a left
channel signal to one voice coil and a right channel signal to the other Hois coil. By combining
the left and right channel signals, and by mounting the speaker unit inside the cabinet so that
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only the resonance sound in the low-frequency region requiring FfT is emitted outside the
cabinet. FIG. 4 shows a speaker unit (3) used by the present invention, in which (9,) and (91,) are
independent voice coils, ae is a magnetic circuit, and α 、 is a cone. FIG. 5 shows an embodiment
of the present invention, wherein aa is a speaker unit, 0 is a cabinet, α is a duct, and as is a
partition plate. FIG. 6 shows a block diagram of a 3D system using the embodiment shown in FIG.
5 as a center channel woofer, where aS is the 7th system shown in FIG. 5, (17a), (17111) is the
amplifier, (18a) 1 (18 h) is a bypass filter, and (la) t (lb) is a left and right speaker system for
reproducing middle and high tones. 0 In the 3D system shown in Fig. 6, the left and right
channels of the amplifier (17a) * ("b") The output is added to the speaker systems (1a) and (1b)
via the bypass filter (lea) I (+ sb) to reproduce the left and right middle high and low sounds and
to the voice coils of the woofer unit 鱒.
Therefore, the output of the woofer unit 和 is the sum of the signals of the left and right
channels, and moreover, the sound radiated to the outside of the cabinet (4) is only the
resonance sound between the cabinet and the duct generated by the woofer unit ze. As shown in
FIG. 1, the middle and high frequency components are cut and only low frequencies. This is
intended as the output of the 3D center-centre Janner woofer. Needless to say, the same function
and effect can be obtained by using the duct of the above embodiment as a drone cone instead.
As described above, according to the present invention, there is no need for a low-pass filter, the
configuration is simple and inexpensive, and there is no 41I element that adversely affects the
sound quality of the whole range such as crosstalk. Component can be acoustically cut to
reproduce extremely high quality bass, and a speaker system suitable for 3D center channel
woofer can be obtained. 0
4. Brief description of the drawings FIG. 1 is a 3D speaker arrangement diagram, FIG. 2 and FIG.
3 are each a block (5) diagram of a conventional 3D system, and FIG. 4 is a speaker used in the
present invention 5 is a cross-sectional view of an embodiment of the present invention, FIG. 6 is
a block diagram of a 3D system using the embodiment of FIG. 5, FIG. 1 is a cabinet and duct or
drone cone Is a sound pressure frequency characteristic diagram of the sound radiated by the
resonance of α 2 ... speaker unit, (9a) I (91)) ... voice coil, 6 cabinets, I ... tact, west ... partition
plate. Agent Shino Shino-6 · '=, (&) EndPage: 2 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5
EndPage: 3
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