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JP2007074255

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DESCRIPTION JP2007074255
PROBLEM TO BE SOLVED: To prevent sound radiated from a speaker on a ceiling from getting
into a microphone on a ceiling due to floor reflection. SOLUTION: A plurality of microphones and
speakers are dispersedly arranged on a ceiling, and a speaker's speech is collected by a
microphone in the vicinity thereof and amplified from a speaker installed on the ceiling. Each of
the speakers is adjusted such that the directivity direction is directed to a point on the floor
surface corresponding to the point immediately below the middle point of the line connecting the
speaker and the adjacent speaker. As a result, it is possible to prevent the sound emitted from the
speaker from being directly input to the microphone disposed on the ceiling by floor reflection,
and to suppress the howling utterance. The adjustment of the directivity of the speaker may be
realized by adjusting the attachment angle of the speaker to the ceiling, or the directivity of each
speaker may be controlled as a speaker array. [Selected figure] Figure 2
Loudspeaker system
[0001]
The present invention relates to a loudspeaker system used in a hall, a conference room, etc.
[0002]
If the speaker and the audience are present in the same room, and the size of the venue is more
than a certain size, and the voice content of the speaker can not be sufficiently heard only by the
voice, it is necessary to raise the voice.
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1
In the case of loud-speaking, in order to pick up clear sound, usually a fixed microphone is
installed and it is necessary for the speaker to speak at that position or for the speaker to carry
the microphone Met. Then, when the speaker changes, such as in the case of question and
answer, it is necessary for the questioner to move to the position of the fixed microphone or to
move the microphone.
[0003]
According to Patent Document 1, in a system in which a sound picked up by a fixed microphone
is amplified using a speaker distributed and disposed on a ceiling, the volume of the speaker is
set to be smaller as it gets closer to the microphone and A temple sound system is described
which averages the synthetic volume with the loud sound. JP-A-9-65470
[0004]
As mentioned above, in the conventional loudspeaker system, it is necessary for the speaker to
move to the position of the fixed microphone or to move the microphone to the position of the
speaker. Also, when there are speakers and questioners, etc., two or more microphones may be
used simultaneously in the same venue. In such a case, microphones for simultaneous speakers
are required, and it is necessary to carry the microphones each time the speaker changes.
Therefore, it is considered to realize a hands-free loud-speaking system by arranging a
microphone and a speaker on the ceiling, picking up the speech of the speaker by the
microphone arranged on the ceiling, and expanding the sound from the speaker similarly
arranged on the ceiling. Be In this case, in order to reduce the amount of wraparound between
the microphone and the speaker, it may be considered to make the microphone and the speaker
cross directivity, but at that time the sound emitted from the speaker is reflected on the floor
surface, May be picked up by
[0005]
With reference to FIG. 6, floor surface reflection in a loudspeaker system in which a microphone
and a speaker are disposed on the ceiling will be described. In this figure, the speech of the
speaker is collected by the microphone MICd in the vicinity, and is radiated from the speakers
SPa, SPb, etc. arranged on the ceiling at a predetermined level. This sound is reflected on the
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2
floor surface, collected by the microphone MICa as shown, and emitted from the speaker SPc
near the speaker. This voice is reflected on the floor surface and input to MICd in the vicinity of
the speaker to form a closed loop, resulting in a problem that howling occurs. As described
above, even if the microphone and the speaker are made to have the directivity between the
microphone and the speaker in order to reduce the amount of the wrap around, there is a
disadvantage that the amount of the wrap due to reflection on the floor increases. In order to
prevent such inconveniences, it is effective to use carpets and other items with as long a hair as
possible in order to improve the sound absorption of the floor surface, but in the case of ordinary
conference rooms, etc., there is a cost problem. There is usually also no such construction. Also, it
is conceivable to use a boundary microphone or the like configured to collect only sound in a
specific direction as the microphone, but the sensitivity is poor for collecting the voice of the
speaker present in a predetermined area by the microphone disposed on the ceiling. It can not be
used.
[0006]
Therefore, according to the present invention, in a loudspeaker system in which a microphone
for picking up the speech of the speaker and a speaker for loudspeakering the voice are arranged
on the ceiling, the sound radiated from the speaker is reflected on the floor and directly input to
the microphone. The purpose is to provide a loudspeaker system that can be prevented from
being
[0007]
In order to achieve the above object, the loudspeaker system according to the present invention
amplifies a microphone installed on a ceiling, a speaker installed on the ceiling, and an input
signal from the microphone to a predetermined level and outputs the amplified signal to the
speaker And a speaker output adjusting unit configured to prevent a sound radiated from the
speaker from being reflected on a floor surface and directly input to the microphone.
The speaker is installed at a predetermined angle on the ceiling so that the sound emitted from
the speaker is not reflected on the floor and is directly input to the microphone, or A speaker
array provided with directivity control means for controlling the directivity so that sound
radiated from the speaker array is not reflected on the floor and directly input to the microphone
is there.
[0008]
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Further, another loudspeaker system according to the present invention detects a sound source
position based on a plurality of microphones distributed in the ceiling, a plurality of speakers
distributed in the ceiling, and input signals from the plurality of microphones. Speaker output
that outputs an input signal from a microphone determined to be a sound source position by the
sound source position detecting means and the sound source position detecting means to the
plurality of speakers with a gain according to the distance between the microphone and each
speaker A loudspeaker system having an adjusting unit, wherein the direction of directivity of the
loudspeaker is such that the sound radiated from the loudspeaker is not reflected on the floor
surface and directly input to the microphone. It is designed to be a point on the floor surface
immediately below the middle point of a straight line connecting other adjacent speakers. The
speaker has a predetermined angle to the ceiling so that the direction of directivity is a point on
the floor surface directly below the middle point of a straight line connecting the speaker and
another adjacent speaker. is set up. In addition, the speaker is a speaker array, and the directivity
thereof is a point on the floor surface corresponding to a position immediately below the middle
point of a straight line connecting the speaker and another adjacent speaker. Directivity control
means for controlling Furthermore, the directivity control means is arranged such that the
direction of directivity of the speaker corresponds to a point on the floor surface immediately
below the midpoint of a straight line connecting the speaker and another adjacent speaker. To
control the directivity of the speaker by selecting the speaker adjacent in the direction away from
the sound source position detected by the sound source position detecting means as the other
adjacent speaker. There is.
[0009]
According to such a loudspeaker system of the present invention, the sound radiated from the
speaker disposed on the ceiling is not reflected on the floor surface and is not directly input to
the microphone disposed on the ceiling. The amount of wraparound to the microphone due to
the floor surface reflection can be reduced without using a material that enhances the sound
absorption property of the floor surface, and the occurrence of howling can be prevented. In
addition, using a speaker array, the directivity direction is a direction in which the sound emitted
from the speaker is not reflected on the floor and is not directly input to the microphone, and in
a direction away from the sound source position According to the loudspeaker system of the
present invention which is adapted to be controlled, it is possible to produce an effect that more
natural loudspeaker is possible.
[0010]
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FIG. 1 is a block diagram showing the configuration of an embodiment of a loudspeaker system
according to the present invention. In this figure, 1 is a plurality (m) of microphones distributed
on the ceiling of a room in which the loudspeaker system of the present invention is installed,
and 5 is a plurality (n) of speakers distributed on the ceiling. Here, each microphone 1 (MIC1 to
MICm) has a directivity limited to pick up only the sound in the area in the vicinity thereof, and
m microphones 1 distributedly disposed on the ceiling It is designed to cover the room. Similarly,
each speaker 5 (SP1 to SPn) is also considered to have a directivity limited so as to louden only
to the respective nearby area, and n speakers 5 distributed in the ceiling are arranged in the
entire room It is made to be able to cover. Here, in the present embodiment, the plurality of
speakers 5 (SP1 to SPn) adjust the attachment angle to the ceiling, and the sound primarily
reflected on the floor surface is directly input to the microphone. It is made to be without. The
attachment angle and direction will be described later. The arrangement interval of the plurality
of microphones 1 and the arrangement interval of the plurality of speakers 5 are determined in
accordance with the directivity and the ceiling height. However, it is desirable to arrange the
microphone and the speaker as far apart as possible.
[0011]
A sound source position detection unit 2 monitors the levels of input signals from the plurality of
microphones MIC1 to MICm to detect the position of the speaker, and outputs control signals to
the input switching unit 3 and the speaker output adjustment unit 4 , 3 is an input switching unit
for selecting a signal input from the microphone MICi corresponding to the place where the
speaker is located based on the signal from the sound source position detection unit 2; 4 is an
input selected by the input switching unit 3 The speaker output adjustment unit performs level
control and delay control corresponding to the plurality of speakers 5 with respect to the signal,
and outputs the signals to the plurality of speakers 5 (SP1 to SPn).
[0012]
The sound source position detection unit 2 monitors the input signals from the plurality of
microphones MIC1 to MICm, and the microphone MICi having the highest input signal level
among the input signals having a predetermined level or more is the sound source position
(speaker position). It is determined that
When the speaker stops speaking and there is no microphone having an input signal equal to or
higher than a predetermined level, it is determined that there is no sound source position.
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Further, when the sound source position detection unit 2 outputs the input signal from the
microphone MICi determined to be the sound source position from the plurality of speakers 5
(SP1 to SPn) and outputs the signal, the sound source position detection unit 2 can A control
signal for setting an output level and a delay time (delay) for the sound output from each of the
speakers SP1 to SPn so that the sound pressure level at the height of the listening position
becomes uniform, is sent to the speaker output adjustment unit 4 Output. Here, with regard to
the output signal level from each speaker, the output level of the speaker is determined so that
the sum of the direct sound from the speaker and the loud sound from the speaker is constant at
any position in the room. That is, the output level of the speaker located at a position far from the
sound source position is controlled so as to compensate for the direct sound distance
attenuation, and each speaker is calculated based on the distance between the sound source
position (microphone position) and each speaker. A table in which the output level corresponding
to each speaker is recorded in advance is created for each sound source position, and the output
level of the sound output from each speaker is referred to by referring to the table. It may be
determined. Further, the delay amount is to assign a delay time corresponding to a time required
for direct sound emitted from the sound source position to reach each speaker position to the
loud sound signal outputted from each speaker. It may be calculated based on the distance
between the microphone position) and each speaker, or a table in which the delay time to each
speaker is recorded in advance for each sound source position is created, and the table is
referred to. The amount of delay may be determined by
[0013]
The input switching unit 3 selects an input signal from the microphone MICi based on the output
signal from the sound source position detection unit 2 (a signal specifying the microphone MICi
detected to be the sound source position), and selects the speaker Output to the output
adjustment unit 4. The speaker output adjustment unit 4 is an audio signal to be output to the
plurality of speakers 5 based on a control signal supplied from the sound source position
detection unit 2 with respect to the input signal selected by the input switching unit 3. The
output level and the delay amount are set for each speaker. Here, when the speaker stops
speaking, the signal specifying the sound source position is not output from the sound source
position detecting unit 2, and the input switching unit 3 does not output the input signal to the
speaker output adjusting unit 4. Then, when another speaker starts speaking, the sound source
position detection unit 2 determines that the microphone MICj in the vicinity of the speaker who
has newly started speaking is the sound source position, and identifies the microphone Are
output to the input switching unit 3. As a result, an input signal from the microphone MICj is
supplied to the speaker output adjustment unit 4, and an output level and a delayed speech
signal are output from each speaker 5 when the microphone MICj is at the sound source position.
The Rukoto.
04-05-2019
6
[0014]
In addition, when a plurality of speakers speak at the same time and there are a plurality of
sound sources, it is possible to simultaneously carry out a plurality of systems of loud speech. In
the following, the case of performing two systems of loudspeakers will be described. Monitors
input signals from multiple microphones MIC1 to MICm and determines that the sound source is
located at these two microphones MICi and MICj when there are two microphones MICi and MICj
with input signals higher than a predetermined level, MICi , MICj on (select the signal from MICi,
MICj). If the speaker near the MICi stops speaking and there is no input signal above the
predetermined level in the MICi, it is determined that the sound source at that position has
disappeared, and the MICi is turned off. Furthermore, if it is determined that the sound source
has run out and another microphone MICk receives an input signal of a predetermined level or
higher, it is determined that the sound source position has moved or a new sound source is
generated in that microphone, and MICk is newly added. Turn on. When there are a plurality of
sound sources, the output level of each speaker is uniform so that the sound pressure level
becomes uniform at any position in the room, as in the case of one system described above, for
each microphone corresponding to the plurality of sound source positions. Control the delay time
and the amount of delay. In this case, the input switching unit 3 selects input signals from a
plurality of (for example, two) microphones, and the speaker output adjusting unit 4 can process
input signals of a plurality of systems. The level of the signal to be output to each speaker and
the delay amount may be controlled with respect to the input signal, and the output signals of
both systems may be added and output to each speaker.
[0015]
As described above, in the present invention, the sound radiated from the plurality of speakers 5
(SP1 to SPn) is not to be primarily reflected on the floor surface and directly input to the
microphone 1; In this embodiment, the desired effect is achieved by adjusting the angle at which
the speakers SP1 to SPn are attached to the ceiling. The attachment angles of the speakers SP1 to
SPn will be described with reference to FIG. FIG. 2A is a plan view of a conference room in which
the loudspeaker system of the present embodiment is installed, and as shown in the figure, in this
embodiment, a plurality of microphones MIC1 to MICm and speakers SP1 to SPn are provided. It
is distributed at equal intervals on the ceiling. In this case, the speakers SP1 to SPn are attached
to the ceiling at an angle such that the center of directivity is directed to a point on the floor
surface immediately below the middle point of the straight line connecting the speakers and the
adjacent speakers. ing. That is, taking the speaker 21 in the figure as an example, a point 26, 27,
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28 on the floor surface corresponding to immediately below the middle point of a straight line
connecting the speaker 21 and the adjacent speaker 22, 23, 24 or 25. It is attached to the ceiling
at an angle such that any one of 29 is at the center of the directivity angle.
[0016]
(B) of FIG. 2 shows a state of reflection from the floor surface when the directivity direction of
each speaker is a point on the floor surface directly below the middle point between the adjacent
speakers as described above. FIG. As shown in this figure, since the sound radiated from the
speaker SPa is reflected at the point A immediately below the middle point with the adjacent
speaker SPb, it is not directly input to the microphone MICa, and similarly, the speaker The
sound radiated from SPc is also not directly input to the microphone MICd. Therefore, the
amount of wraparound due to floor surface reflection can be reduced, and howling can be
suppressed.
[0017]
In the above-described embodiment, a plurality of microphones and a plurality of speakers are
distributed on the ceiling at equal intervals, and each speaker is a point on the floor surface
immediately below the middle point between the adjacent speakers. It was attached so that the
direction of directivity is facing, but it is not limited to this, and at an angle such that the sound
emitted from the speaker is not directly input to the microphone by floor surface reflection I
hope there is. Also, instead of adjusting the direction of directivity by the attachment angle of the
speaker to the ceiling, other means may be used, for example, a device for controlling the
direction of directivity of the speaker. Furthermore, without disposing the plurality of
microphones and the plurality of speakers on the ceiling at equal intervals and adjusting the
mounting angle of the speakers, the sound emitted from the speakers can be directly input to the
microphone by floor surface reflection. You may make it arrange ¦ position a speaker in an
unoccupied position.
[0018]
Next, another embodiment of the present invention will be described. In this embodiment, each of
the plurality of speakers 5 (SP1 to SPn) described above is configured of a speaker array having a
plurality of speaker units, and has directivity control means for controlling the directivity of the
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speaker array. . FIG. 3 is a diagram showing the configuration of an embodiment using a
loudspeaker array of the loudspeaker system of the present invention. The loudspeaker system of
this embodiment is designed to be able to process input signals of up to two systems. In FIG. 3,
the same components as in FIG. 1 are assigned the same reference numerals and explanation
thereof is omitted. However, each of the plurality of speakers SP1 to SPn is a speaker array
having a plurality (p) of speaker units.
[0019]
The input signals collected by the plurality of microphones MIC1 to MICm distributed on the
ceiling as described above are respectively amplified by the head amplifier group 11 and then
converted to digital data by the A / D converter 12. . The input signals from the microphones
output from the A / D conversion unit 12 are input to the sound source position detection unit 2
and also supplied to the input switching unit 3. As described above, the sound source position
detection unit 2 detects that the speaker is present in the area (within the range where the sound
is collected by the microphone) of the microphone with the highest level of the input signal
among the input signals above the predetermined level. And determines that the position of the
microphone MICi is the sound source position, and outputs information specifying the
microphone MICi determined to be the sound source position to the input switching unit 3 and
an output level described later Control signals for controlling the level and the amount of delay
of the signals output from each of the speaker arrays SP1 to SPn when the microphone is at the
sound source position are output to the delay setting units 13 and 15. Further, control signals for
controlling the directivity of each of the speaker arrays SP1 to SPn are output to directivity
control units 14 and 16 described later.
[0020]
The input switching unit 3 has two outputs shown by # 1 and # 2, and the input signal from the
microphone determined to be the sound source position by the sound source position detection
unit 2 is one of two outputs. Selectively connect to For example, the input signal from the
microphone corresponding to the sound source position detected first is connected to the first
output # 1, and the input signal from the microphone of the sound source position detected next
is connected to the second output # 2 Do. In this way, input from two sound source positions can
be processed. 13 controls the output level and controls the delay time for each of the plurality of
speaker arrays SP1 to SPn distributed and arranged with respect to the input signal supplied via
the output # 1 of the first system of the input switching unit 3 The output level / delay setting
circuit 13-1 to 13-n is individually provided corresponding to each speaker array. In this output
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level / delay setting unit 13, based on the control signal from the sound source position detection
unit 2, according to the distance between the sound source position selected as the output # 1 of
the first system and each of the speaker arrays SP1 to SPn. Control of output level and control of
delay time are performed.
[0021]
Reference numeral 14 denotes a directivity control unit for controlling the directivity of each of
the speaker arrays SP1 to SPn with respect to the output of the output level / delay setting unit
13. Each directivity is matched to each speaker array. Sex control circuits 14-1 to 14-n are
provided. Similarly, 15 and 16 are an output level / delay setting unit and a directivity control
unit for the output # 2 of the second system, respectively. As shown, the output level / delay
setting unit 15 has output level / delay setting circuits 15-1 to 15-n corresponding to the
respective speaker arrays, and the directivity control unit 16 similarly operates on the respective
speaker arrays SP1 to SPn. It has directivity control circuits 16-1 to 16-n for controlling its
directivity for each time. A mixer 17 adds the output signals corresponding to the speaker arrays
from the directivity control units 14 and 16, respectively, and includes adders 17-1, 17-2, ..., 17n corresponding to the speaker arrays. It is done. Reference numeral 18 denotes a power
amplifier group for amplifying output signals from the adders 17-1 to 17-n of the mixer 17 to
the speaker arrays SP1 to SPn.
[0022]
FIG. 4 shows directivity control circuit 14-i corresponding to the speaker array SPi in the
directivity control unit 14 and adder 17-i (i = 1 corresponding to the speaker array SPi included
in the mixer 17. -N) is a figure which shows a structure. The directivity control circuit 16-i is also
configured the same as the directivity control circuit 14-i. As shown in FIG. 4, the directivity
control circuit 14-i is a level control circuit 19-i1 for adding weights to the plurality (p) of
speaker units SPi1 to SPip included in the speaker array SPi. A delay control circuit 20-i1 to 20ip is provided to control the delay amount to be applied to each of the speaker units SPi1 to SPip
in order to control the 19-ip and directivity. The parameters set in the level control circuits 19-i1
to 19-ip and the delay control circuits 20-i1 to 20-ip are such that the sound radiated from the
speaker array SPi is reflected on the floor surface, The parameter which becomes directivity so as
not to be directly input to the microphone 1 is set. For example, as in the case of FIG. 2, the
directivity is directed to a point on the floor surface immediately below the midpoint of the
straight line connecting the adjacent speaker arrays. Note that this parameter may be fixedly set
or may be supplied from the sound source position detection unit 2.
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[0023]
As illustrated, the adder 17-i has p adders corresponding to the respective speaker units SPi1 to
SPi included in the speaker array SPi. The outputs of the delay control circuits 20-i1 to 20-ip of
the directivity control circuit 14-i are supplied to the adders corresponding to the respective
speaker units in the adder 17-i, and the outputs of the second system are output. It is added to
the output corresponding to each of the speaker units SPi1 to SPip from the directivity control
circuit 16-i corresponding to # 2. The signals to the respective speaker units SPi1 to SPip
constituting the speaker array SPi outputted from the respective adders of the adders 17-i are
transmitted to the respective speaker units via the corresponding power amplifiers (PA). It is
supplied to SPi1 to SPip. As a result, it is possible to listen to the speaker's pronunciation with
high quality at a uniform level at any position in the room, and the reflected sound from the floor
surface can be directly input to the microphone disposed on the ceiling. It is prevented.
[0024]
Next, an embodiment will be described in which more natural loud-speaking can be performed by
controlling the directivity of the speaker array according to the sound source position detected
by the sound source position detection unit 2. In this embodiment, the direction of directivity of
the speaker array is a straight line connecting the adjacent speaker array to the speaker array
located farther from the sound source position detected by the sound source position detection
unit 2. It is controlled to turn to a point on the floor surface corresponding to the position
directly below the point. In this case, since the sound radiated from the speaker disposed on the
ceiling comes from the direction in which the speaker is present, it is possible to more naturally
listen to the speaker's speech.
[0025]
FIG. 5 is a diagram showing the direction of directivity of each speaker array in this embodiment.
The sound source position detected by the sound source position detection unit 2 is assumed to
be the microphone 31 shown in the drawing. At this time, each speaker array has directivity to a
point on the floor surface immediately below the middle point of a straight line connecting the
speakers and the speaker array located in the direction far from the microphone 31 among the
adjacent speaker arrays. Is controlled so that the direction of For example, the directivity of the
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illustrated speaker array 32 is controlled in the direction of the point 33 on the floor, the
directivity of the speaker array 34 is controlled in the direction of the point 35 on the floor, and
the speaker array 36 is on the floor The directivity is controlled in the direction of point 37. In
other words, the sound source position detection unit 2 is positioned far from the sound source
position detected as an output of the first system with respect to each directivity control circuit
14-1 to 14-n of the directivity control unit 14. The directivity control signal corresponding to the
point on the floor between the adjacent speaker arrays is supplied, and second directivity control
circuits 16-1 to 16-n of the directivity control unit 16 And a directivity control signal
corresponding to a point on the floor surface between adjacent speaker arrays located at a
position distant from the detected sound source position as an output of the system of. As a
result, the loudspeakers radiated from the respective speaker arrays become speech from the
direction of the place where the speaker is present, and natural listening becomes possible.
[0026]
In each of the above-described embodiments, the case has been described in which the plurality
of microphones and the plurality of speakers are separately disposed on the same ceiling.
However, according to the present invention, the microphones and the speakers may be disposed
on the ceiling For example, the same applies. For example, in a remote conference system
connecting a place A and a place B, when microphones and speakers are arranged on the ceilings
of the places A and B, respectively, Control the direction of directivity of the loudspeakers
installed on the ceiling so that floor reflections do not enter the microphones installed on the
respective ceilings directly. As a result, the speech at location A is emitted from the speaker at
location B, wraps around to the ceiling microphone at location B by floor reflection, and is
emitted from the speaker at location A and input to the microphone at location A by floor
reflection. A closed loop can be formed to prevent howling from occurring.
[0027]
FIG. 1 is a block diagram showing a configuration of an embodiment of a loudspeaker system of
the present invention. It is a figure for demonstrating control of the directivity of the speaker in
one embodiment of the loudspeaker system of this invention, (a) is a figure for demonstrating the
direction of the directivity of a speaker, (b) is a figure in this invention It is a figure for
demonstrating floor surface reflection. It is a block diagram which shows the structure of other
embodiment of the loudspeaker system of this invention. It is a block diagram showing
composition of a directivity control circuit. It is a figure for demonstrating control of the
directivity in the further another embodiment of this invention. It is a figure for demonstrating
04-05-2019
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the floor surface reflection in the loud-sounding system by which the microphone and the
speaker are arrange ¦ positioned at the ceiling.
Explanation of sign
[0028]
1: Microphone group 2: Sound source position detection unit 3: Input switching unit 4: Speaker
output adjustment unit 5: Speaker group 11: Head amplifier group 12: A / D conversion unit 13,
15: Output level / Delay setting unit, 13-1 to 13-n, 15-1 to 15-n: output level / delay setting
circuit, 14 and 16: directivity control unit, 14-1 to 14-n, 16-1 to 16 -N: directivity control circuit,
17: mixer, 17-1 to 17-n: adder, 18: power amplifier group, 19: level setting unit, 19-i1 to 19-ip:
level setting circuit, 20: delay Setting unit, 20-i 1 to 20-ip: delay setting circuit
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