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JPS5510274

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DESCRIPTION JPS5510274
Description 1, title of the invention
Speaker device
3. Detailed Description of the Invention The present invention relates to a speaker apparatus
equipped with a plurality of O-speakers having different reproduction frequency bands.
Heretofore, when designing or evaluating a speaker device equipped with a plurality of sensors
having different playback frequency bands and having 0 P force, this speaker device was
installed in an anechoic chamber to measure sound pressure frequency characteristics . However,
when a speaker device capable of obtaining a flat sound pressure frequency characteristic is
installed in a listening room or the like in an anechoic chamber, and the sound pressure
frequency characteristic is measured, the valleys are produced in the sound pressure frequency
characteristic. . FIG. 1 shows sound pressure frequency characteristics in an anechoic chamber of
a 3-way speaker apparatus equipped with a tweeter, a squawker, and a woo. In FIG. 1, A indicates
a woofer, B indicates a squawker, and C indicates a sound pressure frequency characteristic of a
tweeter. However, when a speaker device having a flat sound pressure frequency characteristic
as shown in FIG. 1 is measured in the listening room, valleys d occur in the sound pressure
frequency characteristic as shown in FIG. In the room, the sound waves emitted by the Skoca
reach the listening point directly, and the floor and the wall of the listening room emitted from
the Skoca. This is because the sound is reflected by the ceiling etc. and reaches the listening point
and interferes with EndPage: 1 0. Therefore, as shown in FIG. 3, conventionally, as shown in FIG.
An attempt is made to connect the appropriate band-pass filter to create the characteristics
shown in Fig. 3B 'and compensate the first squawker O valley with this twentieth squawker to
make the sound pressure frequency characteristic flat. there were. However, when a speaker or
device capable of obtaining a flat sound pressure frequency characteristic in the listening room
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in this manner is measured in the anechoic chamber, there is no reflection of the sound wave in
the anechoic chamber, and no valley occurs in the first squawker. In the conventional O-speaker
apparatus, the characteristics in the anechoic chamber do not match the characteristics in the
sonning room, and the anechoic noise does not match. There is a problem in the evaluation and
design of the speaker device that can make the sound pressure frequency characteristics flat in
both the room and the listening room. The present invention eliminates the above-mentioned
conventional drawbacks. 3 and 6 below for one embodiment of the present invention. This will
be described with FIG. FIG. 5 shows the front of the speaker device of this embodiment. In FIG. 6,
1 is a speaker box. 2 is a tweeter attached to the speaker box 1.
Each 3.4 is the first one. The second scarca, 6 is a woofer. FIG. 6 shows a block diagram of this
embodiment. In FIG. 6, 6 is a signal source, 7 is an amplifier, (H 4 F, F) is a high pass filter
connected to the tweeter 2 and passes one or more frequencies of 14 or more. (, BPF-1) is a band
pass filter connected to the first squawker 3, and 0 (BCF) for passing one frequency band (f1 to
f4) is a band cut filter connected to the tenth squawker 3 Yes, cut off the frequency band (f town
~ f3). (BPF и 2) is a band pass filter connected to the second source, the coker 4 and passes the
frequency band (12 to f3) k. (LPF) is a low pass filter connected to U-N0 6 and 1 frequency f1 or
less is allowed to pass. O FIG. 7 shows the non-embodiment O speaker device O sound pressure
frequency characteristics. In FIG. 7, A is the sound pressure frequency characteristic of the
woofer 5, B is the sound pressure frequency characteristic of the first squawker 3, B 'is the sound
pressure frequency characteristic of the twentieth scourker 4, and C is the sound pressure
frequency of the tweeter 2. It is a characteristic. A feature of this embodiment is that a band
cutoff filter (BCF) 'f: connected to the first squawker 3 to block the frequency band (f2 to f5)
where valleys occur in the listening room, and band pass to the second squawker 4 A filter (BPF)
is connected, and the second scourer 4 compensates for the first scourer 3 shielding portion 11
(f2 to fs) to flatten the sound pressure frequency characteristics. It is to be noted that since the
second scour 4 is attached at a position apart from the tenth scour 31, the second scour 4 has no
valley in the band (f2 to f3). Even if the above-mentioned speaker device is measured in the
anechoic chamber, it is cut by the frequency band (f2 to f3) that inhibits flattening or the 0 band
cutoff filter (BCF), so It is a feature that is responsible. FIG. 8 shows a twentieth embodiment of
the present invention. In the present embodiment, the band pass filter (BPF-2) t woofer 5 in one
frequency band (f2 to fs) is connected, and the cutoff band (f2 to f5) of the squawker 3 is woofer
5 as shown in FIG. It compensates, and according to the present embodiment, the O effect can be
obtained in the same way as in the previous embodiment by 3 ways. As the woofer 5 in the
present embodiment, it is necessary to use O as the sound pressure frequency characteristic is
sufficiently extended to the frequency (f5) and no interference due to floor O reflection occurs in
the band (f2 to f3) .
FIG. 10 shows a third embodiment of the present invention. In this embodiment, the tweeter 2 is
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connected to a band pass filter (BPF и 2) having a frequency band (f2 to fs). As shown in FIG. 11,
the squawker 30 cutoff zone (12 to f3) is compensated by the tweeter 2, and the sound pressure
frequency characteristics are flattened in the anechoic chamber and in the listening room.
EndPage: 211 It is possible to solve the same as in the above embodiment even when the
influence by reflection occurs in the band of the speaker other than the speaker is the same as in
the above embodiment, and when a plurality of valleys are generated, each valley individually or
a plurality of valleys together. The same problem can be solved by blocking the band. The
present invention is configured as described above, and can flatten sound pressure frequency
characteristics in an anechoic room and a listening room, and has an advantage that design and
evaluation of a speaker device becomes reliable and easy. .
4. Brief description of the drawings Fig. 1 shows the sound pressure frequency characteristics in
the conventional O-speaker device P anechoic chamber, Fig. 2 shows the sound pressure
frequency characteristics in the speaker room of the speaker room, l и Fig. 3 FIG. 4 is a graph of
sound pressure frequency characteristics in the anechoic chamber of the conventional speaker
device, and FIG. 4 is a graph of sound pressure frequency characteristics in the anechoic
chamber of the same speaker device. FIG. 5 is a front view of the speaker device in an
embodiment of the present invention, FIG. 6 is a block diagram of the speaker device O, FIG. 8 is
a block diagram of a speaker device in another embodiment of the present invention, and FIG.
FIG. 10 is a block diagram of still another embodiment of the present invention, and FIG. 11 is a
sound pressure frequency characteristic diagram of the same speaker device. DESCRIPTION OF
SYMBOLS 1 ... Speaker pot, 2 ........ tweeter, 3 .. 4 Squaker 5, 5 ...... woofer, 6 ...... Signal source. 7 иии
Amplifier,) (PF иии иии High pass filter, BPF и 1 BPF ииииииииии Band pass filter. BCF и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и lowpass filter Name of agent Attorney Nakao et al. 1 person Fig. 1 Employment Salvation Fig. 5 Fig.
2 Fig. 6 EndPage: 3 Fig. 7 Fig. 8-m Liquid Mosquito Fig. 11 EndPage: ?
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