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JPH0514991

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DESCRIPTION JPH0514991
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker apparatus, and more particularly to a loudspeaker apparatus suitable for performing
limited loudspeakers within a specific range.
[0002]
2. Description of the Related Art Conventionally, when it is desired to expand sound by limiting
the sound and voice to a specific narrow area, a narrow directional speaker such as a horn
speaker has been used.
[0003]
However, when it is necessary to simultaneously perform a plurality of voice amplification
services in the same room, for example, in order to prevent the voice coming from the next
speaker from being heard, it is necessary to be careful. It is necessary to take measures such as
devising to adjust the volume to a minimum necessary volume, and installing masking speakers
M1 to M3 separately as shown in FIG. 14 in order to mask unnecessary leakage sound. The
[0004]
Therefore, the present invention eliminates the drawbacks of the above-described conventional
speaker device, and outputs masking sound at the same time while using only one speaker
device, while simultaneously outputting masking sound, so that the level of masking sound is low
and the target service is provided. An object of the present invention is to provide a speaker
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device having a directivity pattern such that the level of masking sound is high outside the area.
[0005]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to
the invention described in claim 1, at least two end speaker units 201 and 203 arranged in line
as shown in the principle explanatory view of FIG. And a loudspeaker system 204 having at least
one central loudspeaker unit 202, a masking electrical signal (for example AE) corresponding to
the tonic to be transmitted (for example AS) and a masking noise (for example A masking
electrical signal (eg, BE) corresponding to BS) is input, and the main electrical signal AE and the
masking electrical signal BE are synthesized in the same phase, and the first synthesized
electrical signal (AE + BE) synthesized is the speaker unit 201 at both ends, And the phase of the
main electrical signal AE is made to be in phase with the phase of the first combined electrical
signal (AE + BE). The second composite electric signal (AE + BE *: where the symbol * is the
opposite phase) where the phase of the squaring electric signal BE is inverted to the phase
opposite to the phase of the first synthesized electric signal (AE + BE) and both are synthesized.
Signal processing means 200 for providing the central speaker unit 202).
[0006]
According to a second aspect of the present invention, in the speaker device according to the first
aspect, the output ratio of the acoustic output of the entire speaker units 201 and 203 to the
acoustic output of the central speaker unit 202 is one.
[0007]
According to a third aspect of the present invention, in the speaker device according to the
second aspect, the output ratio is adjusted by the series parallel connection relation of the bothends speaker units 201 and 203 and the central speaker unit 202.
[0008]
According to a fourth aspect of the present invention, in the speaker device according to the
second aspect, the output ratio is adjusted by the number of turns of the voice coil of the bothends speaker units 201 and 203 and the center speaker unit 202.
[0009]
The invention according to claim 5 is the speaker apparatus according to any one of claims 1 to
4, further comprising signal switching means for performing signal switching so that an input
electric signal is directly given to the speaker system 204 without passing through the signal
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processing means 200. Is configured.
[0010]
According to the invention as set forth in the first aspect of the present invention, as shown in
the principle explanatory view of FIG. 1, the signal processing means 200 transmits the main
electric signal AE and the masking electric signal to the speaker units 201 and 203 at both ends.
A first composite electrical signal (e.g. AE + BE) in phase with BE is provided, and a second
composite electrical signal (AE + BE * in this case) is provided to the central speaker unit 202.
Therefore, in the service area of both end speaker units 201 and 203, the first synthetic sound
(AS + BS in this case) of the tonic sound and the masking sound is emitted, and in the service area
of central speaker unit 202, the tonic sound and the masking sound Second synthetic sound (in
this case AS + BS *) is emitted.
As a result, in the service area of the central speaker unit 202, the masking sound BS * emitted
from the central speaker unit 202 has a phase that leaks from the both-ends speaker units 201
and 203 has a phase opposite to that of BS *. Due to the cancellation, the tonic sound AS is
superior in the service area of this central speaker unit.
[0011]
Further, in the service area of the both-ends speaker unit 201, 203, the tonic sound AS emitted
from each of the both-ends speaker unit 201, 203 is masked by the masking sound BS.
As a result, the tonic sound AS of the service area of the central speaker unit 202 is superior in
the speaker device 100 as a whole.
In this case, as shown in the parentheses, the first synthesized electric signal is (AE * + BE *), the
second synthesized electric signal is (A * E + BE), and the first synthesized sound is (AS * + BS *),
The same effect can be obtained by using (2) synthesized sound as (AS * + BS).
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[0012]
Further, according to the invention of claim 2, in the invention of claim 1, since the output ratio
of the sound output of the entire speaker units 201 and 203 to the sound output of the entire
center speaker unit 202 is 1, Since the masking sound BS * from the speaker unit 202 is
completely offset by the masking sound BS from the speaker units 201 and 203 at the both ends,
the effect is the largest.
In this case, the same is true even if the masking sound from the central speaker unit 202 is BS
and the masking sound from the both-ends speaker units 201 and 203 is BS *.
[0013]
According to the invention of claim 3, in the invention of claim 2, the output ratio (= 1) can be
adjusted by series-parallel connection of the three speaker units 201, 202, 203.
[0014]
According to the invention of claim 4, in the invention of claim 2, the output ratio (= 1) can also
be adjusted by the number of turns of the voice coil of each of the speaker units 201, 202, 203.
[0015]
According to the fifth aspect of the present invention, in the speaker device according to the first
to fourth aspects, signal switching is possible so as to directly supply the input electrical signal to
the speaker system 204 without correcting the signal processing means 200. When switched to,
there is an advantage that it can be used as a normal in-line speaker.
[0016]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the
present invention will now be described based on the drawings.
FIG. 2 shows a first embodiment of the present invention.
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As shown in FIG. 2, this speaker device 101 includes an amplifier portion A1 and a speaker
portion SP1.
The amplifier section A1 has input terminals 1 and 2, a phase inverter 3, mixers 4 and 5, power
amplifiers (power amplifiers) 6 and 7, and output terminals 8 and 9.
In this case, the mixer 5 receives the main electrical signal AE corresponding to the sound AS
(hereinafter referred to as “the tonic”) to be transmitted from the input terminal 1 and to be
transmitted in a certain area, and the input terminal 2 A third combined electrical signal (a
composite of two signals in the same phase with a masking electrical signal BE corresponding to
a sound BS (hereinafter referred to as "masking sound") for suppressing (outside the service area)
AE + BE) A circuit that outputs a sound is configured.
[0017]
The phase inverter 3 and the mixer 4 form a circuit that inverts the phase of the main electrical
signal AE to AE * and mixes it with the masking electrical signal BE to output a second combined
electrical signal (AE * + BE). ing.
The third composite electric signal (AE + BE) is output to the output terminal 9 through the
power amplifier 7, and the second composite electric signal (AE * + BE) is output to the output
terminal 8 through the power amplifier 6 There is.
Here, the symbol * indicates that the phase is opposite or that the phase difference is 180 °.
[0018]
The speaker unit SP1 has input terminals 10 and 11, a high pass filter 12, a phase shift circuit
(phase shift circuit) 13, and speaker units 14 and 16 at both ends and a central speaker unit 16.
The third synthesized electrical signal (AE + BE) output from the amplifier unit A1 and input to
the input terminal 11 is input to the phase shift circuit 13 and is arranged in-line (in a single
row) to the speaker units 14 and 16 connected in series. Connected In addition, the high-pass
filter 12 is configured to be connected to the central speaker unit 15 disposed inline, with the
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second composite electrical signal (AE * + BE) output from the amplifier unit A1 and input to the
input terminal 10 being input. ing. FIG. 3 shows the configuration of the speaker unit SP1 in
more detail.
[0019]
Next, the operation of the speaker device 101 will be described. First, the high-pass signal
passing through the high-pass filter 12 is input to the central speaker unit 15. If this high-pass
filter is a second-order filter having a cutoff characteristic of 12 dB / oct, the output signal for
the input signal, ie, the center The frequency characteristics of the level and phase of the signal
input to the speaker unit are as shown in FIG. That is, as shown in FIG. 4, the output of the highpass filter 12 has a phase of 0 °, that is, there is no phase difference between the input and the
output in a region higher than the cutoff frequency fC. Therefore, an electrical signal of (AE * +
BE) is output to the central speaker unit 15.
[0020]
On the other hand, the full band signal passing through the phase shift circuit 13 is input to both
end speaker units 14 and 16. If this phase shift circuit 13 is a 180 ° shift circuit, an output
signal for the input signal, ie, both end speaker unit The frequency characteristics of the level
and phase of the signal input to the signal are as shown in FIG. It can be seen from FIG. 5 that the
output of the phase shift circuit 13 is 0 ° in the lower range than the cutoff frequency fC and
−180 ° in the higher range than fC. Therefore, a signal (AE * + BE *) in which the phase of the
third combined electric signal (AE + BE) is inverted on the high frequency side with respect to fC
is output to the speaker units 14 and 16 at both ends.
[0021]
Now, when input signals of the same phase are input to the input terminals 10 and 11 of the
speaker unit SP1, as is clear from the phase characteristics of FIGS. 4 and 5, the output signals
are higher than the cutoff frequency fC. This produces a phase difference of 180 °. Therefore,
the sound pressure in the high region on the central speaker unit axis (hereinafter referred to as
"central axis") of the speaker unit SP1 is largely attenuated since the outputs of the both-ends
speaker unit and the central speaker unit are mutually canceled. Then, in the direction away from
the central axis, the distances from the three speaker units 14, 15, 16 are different from each
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other, so that the phase changes, the cancellation effect is reduced, and the output sound
pressure level is recovered. The polar coordinates of this are shown in FIG.
[0022]
Next, when the signal input to the central speaker unit 15 or any one of the two speaker units 14
and 16 is in reverse phase, the phase relationship between the output sound pressures of each of
them is completely the same as described above. The opposite is true. That is, on the central axis,
the synthesized sound is in the same phase, and in the direction off the axis, the synthesized
output sound pressure level is lowered due to the phase change due to the distance difference.
FIG. 7 shows this in polar coordinates.
[0023]
Therefore, if the characteristic of FIG. 7 is obtained for the tonic sound and the characteristic of
FIG. 6 is obtained for the masking sound, the loud sound service can be performed in the specific
area. Therefore, in the present embodiment, when the input signal to each speaker unit is an
electric signal, conversion is made to have the above-described two types of phase relationships
by devising on the circuit. That is, the third combined electric signal (AE + BE) is further
transferred by -180 ° by the phase shift circuit 13 and input as the first combined electric
signal (AE * + BE *) to the both-ends speaker units 14 and 16, 2) The combined electrical signal
(AE * + BE) is input to the central speaker unit 15 with the phase unchanged. FIG. 8 shows polar
coordinates of the output sound pressure characteristics in this case. As shown in FIG. 8, the first
synthesized sound (AS * + BS *) corresponding to the first synthesized electric signal (AE * + BE *)
is emitted from the speaker units 14 and 16 at both ends. Further, the central speaker unit 15
emits a second synthesized sound (AS * + BS) corresponding to the second synthesized electric
signal (AE * + BE). Here, the suffixes * indicate that the phases are opposite to each other.
Therefore, as to the masking sound, BS emitted from the central speaker unit 15 is offset by BS *
emitted from the both-ends speaker units 14 and 16. Now, as shown in FIG. 3, since each speaker
unit is connected, if the number of turns of the voice coil of each speaker unit 14, 15, 16 is the
same, the sound output PW14, PW15, PW16 from each speaker unit There is a relationship of
(PW14 + PW16) / PW15 = 1 (1). This is because both end speakers 14 and 16 are connected in
series. Accordingly, PW14 + PW16 = PW15 (2) PW14 = PW16 (3) PW14 = PW16 = 1/2 ×
PW15 (4). As can be understood from this, in FIG. 8, the masking sound BS from the center
speaker unit 15 is equal to the sum of the masking sounds BS * of opposite phase from the bothends speaker units 14 and 16, BS = 2 x BS * ( 5). As a result, these masking sounds are
substantially offset within the hatched portion P2 of the service area of the central speaker unit
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18, and on the other hand, within the sand portion P1 of the service area of both end speaker
units 14 and 16 the first synthetic sound (AS * + BS *) Is superior, but in this case, since the tonic
AS * and the masking sound BS * are in phase, the tonic AS * is masked by the masking sound BS
*.
Therefore, as a whole of this speaker device, the tonic sound AS * in the direction near the central
axis (θ = 0 °) in FIG. 8 is predominantly heard by the listener.
[0024]
Therefore, according to the first embodiment, by inputting two different types of signals to one
speaker system, it is possible to output sounds having different directional characteristics. If you
want to serve different targets to different sounds, you can serve the target tonic with narrow
directivity and output the masking sound with bi-directional, so you can serve only the target you
want to hear .
[0025]
Second Embodiment FIG. 9 shows a second embodiment of the present invention.
In this second embodiment, one set (two) of central speaker units 17 and 18 of the same output
is connected in series instead of the central speaker unit 15 which is one in the speaker section
SP1 of the first embodiment. It differs from the first embodiment in the points. The same effect
as that of the first embodiment can be obtained as such a connection type. That is, since both end
speaker units 14 and 16 are connected in series and one set (two) of central speaker units 17
and 18 are connected in series, the sound output PW14, PW16, PW17, PW18 of each speaker
unit There is a relationship such as PW14 + PW16 = PW17 + PW18 (6) PW14 = PW16 = PW17
= PW18 (7). Therefore, as in the first embodiment, the masking sound BS * is canceled in the
central area and the tonic AS * is masked in the both end areas.
[0026]
Third Embodiment FIG. 10 shows a third embodiment of the present invention. The third
embodiment shows an example in which the both-ends speaker units 14 and 16 and the center
speaker units 17 and 18 connected in series are connected in parallel in the second embodiment.
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In the third embodiment, the relationship of the equation (7) is established among the sound
outputs PW14, PW16, PW17 and PW18 of the respective speaker units. Therefore, the same
effect as that of the first embodiment or the second embodiment can be obtained.
[0027]
Fourth Embodiment Next, FIG. 11 shows a fourth embodiment of the speaker device according to
the present invention. In the second embodiment shown in FIG. 9, a low pass filter 19 is provided
instead of the phase shift circuit 13, and low-pass signals passed through the low pass filter 19
are input to the speaker units 14 and 16. It is. By setting the cutoff characteristic of the low-pass
filter 19 to 12 dB / oct, the phase characteristic becomes the same characteristic as that of FIG.
5, so that the phase relationship between the speaker units 14 and 16 and the center speaker
units 17 and 18 is the same The same characteristic as in FIG. 6 in which the on-axis sound
pressure level is lowered is obtained, and the same characteristic as in FIG. 7 is obtained when
the phase difference (reverse polarity) is 180 °. The speaker apparatus according to the fourth
embodiment has the following relationship between the distance d between the two central
speaker units 17 and 18 and the distance D between the two speaker units 14 and 16 and the
wavelength λ c of the sound at the crossover frequency fc: D = λ c (8) d = D / 4 (9) The speaker
device is capable of further enhancing the narrow directivity characteristic (bi-directional
characteristic).
[0028]
Fifth Embodiment Next, FIG. 12 shows a fifth embodiment of the speaker apparatus according to
the present invention. The fifth embodiment shows an example where the high pass filter 12 and
the phase shift circuit 13 are inserted in the amplifier section A5 in the first embodiment shown
in FIG. In this case, as the speaker system SP5 alone can be reduced in weight, there is an effect
such as an increase in the degree of freedom of installation.
[0029]
Sixth Embodiment Next, FIG. 13 shows a sixth embodiment of the speaker apparatus according to
the present invention. The sixth embodiment differs from the first embodiment shown in FIG. 2 in
that changeover switch circuits 23 and 24 are provided between the amplifier unit and the
speaker unit. By inputting a switching control signal to the control terminal 25, the switching
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circuit 23, 24 can be switched to interlock with the terminals t1 and t3 or the terminals t2 and
t4. By this configuration, when connected to the terminals t1 and t3 side, the same operation as
the first embodiment is shown, and when connected to the terminals t2 and t4 side, the high
frequency speaker It can be used as a normal two-way speaker having a low frequency speaker.
[0030]
The present invention is not limited to the above embodiments. That is, in the above embodiment,
the first synthesized electric signal is (AE * + BE *), the second synthesized electric signal is (AE *
+ BE), the first synthesized sound is (AS * + BS *), and the second synthesized sound is Although
described as (AS * + BS), the first synthesized electric signal is (AE + BE), the second synthesized
electric signal is (AE + BE *), the first synthesized sound is (AS + BS), and the second synthesized
sound is It may be (AS + BS *).
[0031]
Also, in the above embodiment, the output ratio of the both-ends speaker unit and the center
speaker unit is adjusted to 1 by the connection (in series or in parallel) between the speaker
units, but this is not a speaker connection but each speaker You may adjust by the number of
voice coil turns of a unit.
[0032]
As described above, according to the present invention, the masking sound level is low within the
target service area while the masking sound is simultaneously output by only one speaker device,
and the target service area is low. Outside, it is possible to have a directivity pattern such that the
level of the masking sound is high.
[0033]
In addition, the speaker system alone has an advantage that it is possible to realize a variable
directivity as a single speaker system only by providing a circuit for inverting the polarity of the
input signal to either the center or both speakers at the speaker system side. Have.
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