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JPS55168287

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS55168287
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a conventional speaker
device, FIG. 2 is a sound pressure frequency characteristic at the listening point of the device,
and FIGS. 3 and 4 are electric circuits of the conventional speaker device. 5 and 6 are sound
pressure frequency characteristics at the listening point of the speaker device, FIG. 6 is a vector
diagram of the direct wave and the reflected wave of the speaker device, and FIGS. 7 and 8 are
other conventional speaker devices Fig. 9 is a vector diagram of the direct wave and the reflected
wave of the same speaker device. 10 and 11 are electric circuit diagrams of the speaker device
according to an embodiment of the present invention, FIG. 12 is a vector diagram of direct and
reflected waves of the speaker device, and FIG. 13 is a listening point of the speaker device.
Sound pressure frequency characteristics, FIGS. 14 and 15 are electric circuit diagrams of other
embodiments of the present invention. 1 ...... speaker box, 2 ...... floor, 3 ...... first speaker, 4 ......
second speaker, 5 ..... Listening point.
DETAILED DESCRIPTION OF THE INVENTION The present invention provides all loudspeaker
devices having flat sound pressure frequency characteristics not only in an anechoic chamber,
but also in a real sound field with floor reflections 0 ': f:', ": 2 Conventional speaker devices are
designed to have a flat sound pressure frequency characteristic in an anechoic chamber. In this
way, when using a speaker device whose sound pressure frequency characteristics are flat in an
anechoic room in a real sound field with floor reflections (1. A dip occurs in the number
characteristic for 4 laps, and it does not become a flat characteristic. SUMMARY OF THE
INVENTION The present invention provides a speaker device which eliminates the conventional
defect of L and has a flat sound pressure frequency characteristic both in an anechoic chamber
and in a real space. . FIG. 1 shows a conventional speaker device. In FIG. 1, reference numeral 1
denotes a speaker box disposed on a floor surface 2 (in which a first speaker 3 and a second
speaker 4 are attached). The first speaker 3 is provided at a position of 't-0, 7 m from the floor
surface 2 and the second speaker 4 is provided at a position of 0.36 m from the floor surface 2' '.
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The reference numeral 5 denotes a microphone, and the microphone 5 is disposed 2 m in front
of the Svike 3 box 1 and 0.9 m from the floor surface. In FIG. 1, the sound emitted from the first
speaker 3 directly reaches the listening point 5 through the passage Ai, and is reflected by the
ground surface 2 as shown by the passage B to reach the listening point 5. In this case, the path
difference between path A and path B is 0.651 m, and a dip occurs at a frequency of 312 Hz and
its odd multiple as shown by a in FIG. 2 (temperature 20 'C). Similarly, in the second speaker 4,
as shown by b in FIG. 2, a tip is generated at a frequency of 606 Hz and its odd multiple. The
inventor of the present invention has already proposed a speaker device for removing dips on
sound pressure frequency characteristics due to floor reflections. Next, this speaker device will
be described with reference to FIGS. 3 and 4. 2, in the same arrangement as in FIG. 1, the first
speaker 3 is cut off at s 312 Hz as shown in FIG. 4 and a band-pass filter BPF consisting of a C
series resonance circuit, as shown in FIG. Connect and drive both speakers 3.4. Thus, when BEF is
connected to the first speaker 3 and BPF-i-connected to the second speaker 4, as shown in FIG. 5,
no dip occurs at either 312 Hz or 606 Hz. .
However, in this case, a new tip occurs around 440 Hz. The tip near this 440 Hz is smaller than
the tip at 312 Hz, but it can not be ignored. The cause of the dip occurring at around 440 Hz as
described above will be described with reference to the vector diagram of FIG. FIG. 6 shows an
input voltage equal to 440 Hz when the level of the direct wave at the listening point 5 when the
first speaker 3 is driven alone without a filter is 19 phase is oo in FIGS. 3 and 4 As shown in Fig.
6, the relationship between the level and the phase of the direct wave and the reflected wave
from each speaker 3.4 is vector-displayed. In FIG. 6, Sl is a direct wave of the first speaker 3, S2
is a floor surface reflected wave of the first speaker 3, S5 is a direct wave of the second speaker
4, and S4 is a floor of the second speaker 4. It is a reflected wave, and it becomes a synthetic
wave of S1 to S4 at the listening point 5. S5 is a composite wave of 81 to S4, and the sound
waves of 81 to S4 cancel each other in a vector, and the level decreases at 440 Hz to generate a
tip. FIGS. 7 and 8 show other conventional examples in which sound pressure frequency
characteristics are V-carrying in an anechoic chamber and a real sound field, and the first
speaker 3 has C parallel resonant circuits A BEF composed of a series resonant circuit is
connected, and a BPF composed of a C series resonant circuit and a C parallel resonant circuit is
connected to the second speaker 4. The above BEF and BPF are for blocking and passing the
frequency band around 312 Hz respectively. FIG. 9 is a vector diagram of the second
conventional example shown in FIGS. 7 and 8. S6 is a direct solution of the first speaker 3 in
liquid contact, S7 is a floor surface reflected wave of the first speaker 3, S8 indicates the direct
wave of the second speaker 4, S9 indicates the second speaker 40 floor surface reflected wave,
and the synthesized wave of 86 to S9 is "10", and cancellation occurs as in the conventional
example, and the memory is It is something that declines. FIGS. 10 and 11 show an embodiment
of the present invention. This embodiment is a first embodiment of the present invention. The
first speaker 3 is a C parallel resonant circuit, and the band cut-off filter BEF-i connection shif,
and the second speaker Connected in series to the speaker 4 A BPF comprising a C series
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resonance circuit and a parallel connection or a C parallel resonance circuit is connected. FIG. 12
is a vector diagram of the non-embodiment. S11 is a direct wave of the first speaker 3, S12 is a
first speaker 30 floor reflection wave, S13 is a direct wave of the second speaker 4, and set is
FIG. The composite wave of 811 to Sj 4 is 815, and there is neither dip nor peak, and the sound
pressure frequency characteristic becomes flat as shown in FIG.
14 and 15 show another embodiment 7 of the present invention, which not only removes the tip
at 312 Hz but also the dip at 936 Hz and flattens the sound pressure frequency characteristics at
the listening point. And, as shown in FIG. While connecting the C series resonance circuit, as
shown in FIG. 15, another C parallel resonance circuit is connected. The present invention is
configured as in the above, and the sound pressure frequency characteristics at the listening
point are common not only in an anechoic chamber but also in a real tr field with floor surface
reflection.
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