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JP2007318551

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007318551
An audio conference apparatus capable of easily determining the states of a plurality of
microphone units and a plurality of speaker units provided in an audio conference apparatus
without a dedicated inspection jig. When a test mode is received by an operation unit 4, a voice
conference device 1 emits different test voices in turn from a plurality of speaker units SP1 to
SP12, and also emits a voice from any of the speaker units. The display unit 7 displays the
presence or absence. Further, in the audio conference apparatus 1, for the plurality of speaker
units SP1 to SP12, the adjacent two speaker units are selected in order and the same sound is
emitted simultaneously and collected by the microphone unit between them. The audio signals
collected by the two microphone units arranged symmetrically with respect to the speaker unit
emitting the test sound are added. [Selected figure] Figure 7
Voice conference device
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a
speaker unit and a microphone unit inspection function provided in an audio conference
apparatus used when conducting an audio conference between a plurality of points.
[0002]
Conventionally, when meeting between distant points, a telephone is generally used.
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However, when holding a conference between a plurality of points and a large number of people,
the telephone is not suitable. Therefore, conventionally, a voice conference device has been
proposed as a device for holding a conference between a plurality of points and a large number
of people (see Non-Patent Document 1).
[0003]
The audio conference apparatus of Non-Patent Document 1 picks up a clear audio without
picking up ambient noise in the speaker tracking by the microphone array, transmits the audio
signal to another audio conference apparatus, and performs another audio conference. The voice
signal sent from the device is combined with the voice wave front by the speaker array to
reproduce clear voice. Therefore, if any one of the microphones and the speakers in the
microphone array and the speaker array breaks down, the balance of the collected sound and the
emitted sound is lost, which gives the conference participants an uncomfortable feeling.
[0004]
In order to prevent the occurrence of such a problem, the manufacturer inspects the speaker
array and the microphone array of the audio conference apparatus at the time of shipment using
a test apparatus. Conventionally, as a device for inspecting a speaker, there has been a speaker
test device which simultaneously performs a speaker operation test and a polarity determination
(see Patent Document 1). YAMAHA News Release Yamaha Teleconference System "Project
Phone" "PJP-100H" / "PJP-100UH", [online], March 10, 2006, Yamaha Corporation, [May 23,
2006 search], Internet <Http://www.yamaha.co.jp/news/2006/06031002.html> Japanese Utility
Model Application Publication No. 6-19392
[0005]
When the above-mentioned conventional speaker test apparatus is used as an inspection jig of
the audio conference apparatus, it has been necessary to connect the audio conference apparatus
to the speaker test apparatus and use it. Therefore, the inspector must connect and disconnect
the audio conference apparatus to and from the speaker test apparatus at the time of shipping
inspection of the audio conference apparatus, and the inspection efficiency is not good. In
addition, when the voice conference device breaks down while the user is using the service, the
serviceman can not identify the broken speaker unless he / she brings the inspection jig to the
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user and does not check the operation. Furthermore, when the user feels strange while using the
audio conference device, etc., the operation of the plurality of microphone units and speaker
units provided in the audio conference device can not be individually confirmed, so these are
broken. It could not be determined whether or not
[0006]
Therefore, an object of the present invention is to provide an audio conference apparatus capable
of easily determining the states of a plurality of microphone units and a plurality of speaker units
provided in an audio conference apparatus without a dedicated inspection jig. .
[0007]
The present invention has the following configuration as means for solving the above-mentioned
problems.
[0008]
(1) A speaker array in which a plurality of speaker units are arranged, a microphone array in
which a plurality of microphone units are arranged, An audio signal collected by the microphone
array is transmitted to a partner apparatus, and from the partner apparatus A communication
unit that receives an audio signal of the speaker, a speaker control unit that inputs the audio
signal received by the communication unit to the speaker array, an operation unit that receives
an execution of a test mode, and the operation unit receives an execution of a test mode And a
test unit for generating a test audio signal and sequentially inputting the test audio signal to each
speaker unit of the speaker array.
[0009]
In this configuration, when the operation unit receives execution of the test mode, the audio
conference apparatus sequentially inputs test audio signals to the speaker units of the speaker
array and emits test audio from the speaker units.
Therefore, the user or the serviceman operates the operation unit to start the test mode, and
hears the test sound sequentially emitted from each speaker unit of the speaker array, so that
each speaker unit normally emits noise or not You can check
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[0010]
(2) The speaker array has a configuration in which the plurality of speaker units are arranged in
a line, and the test unit sequentially tests one or more speaker units from one end of the speaker
array toward the other end. An audio signal is input.
[0011]
In this configuration, when the operation unit receives the execution of the test mode, the test
unit sequentially inputs a test audio signal for each of one or more speaker units from one end of
the speaker array to the other end, and the respective speaker units Sound test sound from.
Therefore, the user or the service person can easily grasp whether or not each speaker unit emits
sound normally by checking the test sound sequentially emitted from each speaker unit with his
ear, and any one of the speaker units If the condition is not good, the speaker unit can be
identified immediately.
In addition, when the same test sound is emitted simultaneously from a plurality of speaker units
in the audio conference apparatus, when any speaker unit is connected in reverse polarity, only
the sound emitted from this speaker unit is reversed. Because of the phase, the synthesized voice
emitted from each speaker unit sounds small.
Therefore, the inspector checks the test sound sequentially emitted from each speaker unit with
his ear, and detects that any one of the plurality of speaker units simultaneously emitting the
sound is connected in the opposite polarity. it can.
[0012]
(3) The test unit takes in an audio signal collected by the microphone array in parallel with the
process of inputting a test voice to the speaker unit, and the speaker units normally emit noise
based on the audio signal. It is characterized by judging whether to do.
[0013]
In this configuration, in the test mode, the voice conference device picks up the voice emitted by
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the speaker unit with the microphone array, and determines that the voice is normally emitted.
Therefore, the state of each speaker unit can be determined without checking the sound emitted
by each speaker unit of the audio conference device with the ear.
[0014]
(4) The test unit sequentially inputs a test sound signal to each two adjacent speaker units, and
whether or not the connection of the two speaker units is reverse polarity based on the sound
signal collected by the microphone array It is characterized in that
[0015]
When one of the two speaker units is connected in reverse polarity, when the same sound is
emitted simultaneously from the two speaker units, the opposite phase sound is emitted from
one of the speaker units. The sound emitted from the unit cancels out and becomes smaller.
In this configuration, a test voice signal is sequentially input to each two adjacent speaker units,
and the sounds emitted from the two speaker units are collected by the microphone array.
Therefore, the polarity of each speaker unit can be determined without checking the sound
emitted by each speaker unit of the audio conference device with the ear.
[0016]
(5) The test unit is characterized in that a scale or a melody is generated as the test sound signal.
[0017]
In this configuration, when the operation unit receives execution of the test mode, the audio
conference apparatus causes each speaker unit of the speaker array to emit a scale or a melody
as a test sound.
Therefore, the user or the serviceman can easily determine which speaker unit has an
abnormality by checking the scale or melody emitted from each speaker unit of the speaker array
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with his ear. In addition, even when the sound emitted by each speaker unit is collected by the
microphone array, a different sound is emitted for each speaker unit, so it is easy to determine
whether each speaker unit emits sound normally. Become.
[0018]
(6) The test unit is characterized in that it is determined whether or not each microphone unit
normally picks up, based on an audio signal picked up by each microphone unit of the
microphone array.
[0019]
In this configuration, the audio conference device picks up the test voices emitted from the
respective speaker units by the respective microphone units of the microphone array, and
determines whether or not the respective microphone units normally collect the sound.
Therefore, when the microphone unit breaks down, the audio conference apparatus can easily
determine the state of the microphone unit since the audio signal output from the microphone
unit is different from that in the normal state.
[0020]
(7) The test unit adds audio signals collected by two microphone units arranged symmetrically
with respect to a speaker unit to which the test audio signal is input, and based on the added
audio signal, It is characterized by judging whether the connection of both microphone units is
reverse polarity.
[0021]
When one of the two microphone units is connected in reverse polarity, adding the test voice
signals collected by the two microphone units arranged symmetrically with respect to the
speaker unit, the one microphone unit is in antiphase Because the voice signal of is output, when
both voice signals are added, they cancel each other and the level of the voice signal becomes
smaller.
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In this configuration, the microphone test unit picks up test voices with two microphone units
arranged symmetrically with respect to the two speaker units of the speaker array, adds them,
and adds them to the summed audio signal. It is determined based on whether the microphone
unit is connected in reverse polarity. Therefore, when one of the microphone units is connected
in the reverse polarity, the level of the added audio signal decreases, so the audio conference
apparatus can easily determine the connection state of the microphone unit.
[0022]
In the audio conference apparatus according to the present invention, when the operation unit
receives execution of the test mode, different test voices are sequentially emitted from the
plurality of speaker units, so that the user does not hear voices from the speaker units or the
volume is small. If so, it is easy to identify which speaker unit is broken.
[0023]
Also, in the audio conference apparatus, for a plurality of speaker units, two adjacent speaker
units are selected in order, the same sound is emitted at the same time, and the microphone unit
between them is used to collect sound or test sound. Since the sound signals collected by the two
microphone units arranged symmetrically with respect to the speaker unit emitting the sound are
added, if the polarity of the speaker unit is incorrectly connected, the two speaker units are
connected. Since the sound emitted from is canceled each other to reduce the level, it can be
easily detected.
Further, when the microphones are incorrectly connected, if the sound signals picked up by the
two microphones are combined, they cancel each other out and the level becomes smaller, so
that the erroneous connection of the microphones can be easily detected.
[0024]
FIG. 1 is a three-sided view showing the appearance of the audio conference apparatus, where (A)
is a plan view, (B) is a front view (a view from the long side) and (C) is a right side view (short)
View from the side of the side). FIG. 2 is a view showing a speaker unit array and a microphone
unit array of the audio conference apparatus shown in FIG. 1, (A) is a front view (corresponding
to FIG. 1 (B)), (B) is a bottom view, C) is a rear view (a surface opposite to the front shown in FIG.
2 (A)).
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[0025]
As shown in FIGS. 1 and 2, the audio conference device 1 includes a housing 2, a leg 3, an
operation unit 4, a light emitting unit 5, a display unit 7, and an input / output connector 11.
[0026]
The housing 2 has a substantially rectangular parallelepiped shape, and leg portions 3 (3A, 3B)
are provided at both ends of the lower surface 2K to separate the lower surface 2K from an
installation surface such as a desk by a predetermined distance.
[0027]
In the following description, of the side surfaces of the housing 2, the front and rear sides
including the long sides are the front side 2M and the rear side 2U, and the left and right sides
including the short sides are the right side 2R and the left side 2L. It is called.
[0028]
At the right end of the top surface 2J of the housing 2, a display unit 7 provided with an
operation unit 4 including a plurality of buttons and a display screen is installed.
The operation unit 4 is connected to the control unit 10 installed in the housing 2, receives a
user's operation input, and outputs a signal to the control unit 10.
In addition, the control unit 10 outputs a control signal corresponding to the signal input from
the operation unit 4 to the display unit 7, and the display unit 7 adjacent to the operation unit 4
displays the content according to the operation content, the execution mode, etc. Display.
[0029]
At the center of the top surface 2J of the housing 2, a light emitting unit 5 composed of a
plurality of LEDs (light emitting elements) arranged radially around one point is installed.
[0030]
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An input / output connector 11 is installed on the right side 2R of the housing 2.
Further, in the audio conference apparatus 1, a network cable is attached to the LAN interface of
the input / output connector 11, and the audio conference apparatus 1 is connected to another
audio conference apparatus via a network such as the Internet to perform predetermined
communication settings. I can communicate.
[0031]
On the lower surface 2K of the housing 2, speaker units SP1 to SP12 of the same shape are
installed.
The speaker units SP1 to SP12 are installed in a linear shape (line shape) at regular intervals in
the longitudinal direction of the lower surface 2K, and constitute a speaker array. On the front
side 2M of the housing 2, microphone units MIC101 to MIC116 of the same shape are installed.
The microphone units MIC101 to MIC116 are installed linearly (in a line) at regular intervals in
the longitudinal direction of the front side surface 2M, and constitute a microphone array.
Further, on the rear side 2U of the housing 2, microphone units MIC201 to MIC216 having the
same shape are installed. The microphone units MIC201 to MIC216 are installed linearly (in a
line) at regular intervals in the longitudinal direction of the rear side surface 2U to constitute a
microphone array.
[0032]
Next, the circuit configuration of the audio conference device 1 will be described. FIG. 3 is a
functional block diagram of the audio conference device.
[0033]
As shown in FIG. 3, the audio conference apparatus 1 includes an operation unit 4, a display unit
7, a control unit 10, an input / output connector 11, an input / output I / F (interface) 12, a
sound emission directivity control unit 13, D / A converter 14 (14-1 to 14-12), sound emitting
amplifier 15 (15-1 to 15-12), speaker units SP1 to SP12 constituting a speaker array,
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microphone units MIC101 to MIC116 constituting a microphone array, MIC 201 to MIC 216,
sound pickup amplifier 16 (16-1 to 16-32), A / D converter 17 (17-1 to 17-32), sound collection
beam generation unit 181, sound collection beam generation unit 182, sound collection A beam
selection unit 19 and an echo cancellation unit 20 are provided.
[0034]
The input / output I / F 12 converts an input voice signal from another voice conference device
input through the input / output connector 11 from a data format (protocol) corresponding to
the network, and transmits the converted voice signal through the echo cancellation unit 20. The
noise is given to the directivity control unit 13.
At this time, when the input / output I / F 12 receives input voice signals from a plurality of
other voice conference devices, it identifies them for each voice conference device and emits
sound via the echo cancellation unit 20 through different transmission paths. The directivity
control unit 13 is supplied. Further, the input / output I / F 12 converts the output voice signal
generated by the echo cancellation unit 20 into a data format (protocol) corresponding to the
network, and transmits the data to the network through the input / output connector 11.
[0035]
The sound emission directivity control unit 13 performs delay processing and amplitude
processing and the like specific to each of the speaker units SP1 to SP12 configuring the speaker
array on the input sound signal based on the specified sound emission directivity. Generate a
noise emission signal individually. Here, as the sound emission directivity, one that causes the
emitted sound to converge at a predetermined position in the longitudinal direction of the casing
2 of the audio conference apparatus 1, or a virtual point sound source is set to emit sound from
the virtual point sound source Are emitted, and individual sound emission signals are generated
such that the sound emission directivity is realized by the sound emission from the speaker units
SP1 to SP12.
[0036]
Then, the sound emission directivity control unit 13 outputs the individual sound emission
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signals to the D / A converters 14 (14-1 to 14-12) provided for each of the speaker units SP1 to
SP12. Each D / A converter 14 (14-1 to 14-12) converts the individual sound emission signal into
an analog format and outputs it to each sound emission amplifier 15 (15-1 to 15-12) to emit
each sound. The amplifiers 15 (15-1 to 15-12) amplify the individual sound emission signals and
apply them to the speaker units SP1 to SP12.
[0037]
The speaker units SP1 to SP12 are composed of nondirectional speaker units, convert the sound
of the given individual sound emission signal and emit the sound to the outside. At this time,
since the speaker units SP1 to SP12 are installed on the lower surface of the housing 2, the
emitted sound is reflected on the installation surface of the desk on which the audio conferencing
apparatus 1 is installed, and the audio conferencing apparatus 1 is It passes between the lower
end of the front side 2M and the rear side 2U of the rear and the installation surface and
propagates obliquely upward, that is, toward the face direction of the conference participant who
sits next to the desk.
[0038]
The microphone units MIC101 to MIC116 and MIC201 to MIC216, which constitute the
microphone array, pick up the sound propagating from the outside of the audio conference
apparatus 1 and convert it into an electric signal, and the pickup signal is collected for each
sound pickup amplifier 16 Output to (16-1 to 16-32). Each of the sound pickup amplifiers 16
(16-1 to 16-32) amplifies the sound pickup signal and outputs it to the A / D converters 17 (17-1
to 17-32). Each A / D converter 17 (17-1 to 17-32) converts an analog pickup signal input from
each pickup amplifier 16 (16-1 to 16-32) into a digital pickup signal. Then, the sound is output
to the sound collection beam generation units 181 and 182.
[0039]
The sound collection beam generation unit 181 performs predetermined delay processing or the
like on the sound collection signals of the microphone units MIC101 to MIC116 to generate
sound collection beam signals MB11 to MB14.
[0040]
The sound collection beam generation unit 182 performs predetermined delay processing and
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the like on the sound collection signals of the microphone units MIC201 to MIC 216 to generate
sound collection beam signals MB21 to MB24.
[0041]
The sound collection beam selection unit 19 inputs the sound collection beam signals MB11 to
MB14 and MB21 to MB24, compares the signal strengths, and selects the sound collection beam
signal MB meeting the predetermined conditions set in advance.
Further, the sound collection beam selection unit 19 outputs sound collection environment
information including the sound collection direction (sound collection directivity) corresponding
to the selected specific sound collection beam signal MB to the control unit 10.
The control unit 10 specifies the speaker direction based on the sound collection environment
information, and sets the sound emission directivity to be given to the sound emission directivity
control unit 13. Further, the sound collection beam selection unit 19 includes a frequency
detection circuit (not shown), and detects the frequency of the sound collection signal of each of
the microphone units MIC101 to MIC116 and MIC201 to MIC216.
[0042]
The echo cancellation unit 20 is provided with independent echo cancelers 21 to 23 respectively,
and has a structure in which these are connected in series. By performing an echo cancellation
process, appropriate echo cancellation is performed, and its own device Only speaker voice is
sent to the network as an output voice signal.
[0043]
Next, the configuration for checking the state of each of the speaker units SP1 to SP12 and the
microphone units MIC101 to MIC116 and MIC201 to MIC216 of the audio conference device 1
will be described.
[0044]
FIG. 4 is a block diagram showing a configuration of a test circuit for inputting a test voice to the
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speaker unit.
As shown in FIG. 4A, the sound emission directivity control unit 13 includes a plurality of signal
processing units 31 (31-1 to 31-12).
The signal processing units 31 (31-1 to 31-12) respectively include the beam control block 32
(32-1 to 32-12), the test signal generation circuit 33 (33-1 to 33-12), and the changeover switch
34. (34-1 to 34-12) are provided.
[0045]
The beam control block 32 (32-1 to 32-12) inputs a delay process and an amplitude process, etc.
specific to each of the speaker units SP1 to SP12 constituting the speaker array based on the
designated sound emission directivity. It does for the signal and generates the emission signal
individually.
[0046]
The test signal generating circuit 33 (33-1 to 33-12) generates a test audio signal for testing
each of the speaker units SP1 to SP12.
When the control signal is sent from the control unit 10, the test signal generation circuit 33
generates a test audio signal.
[0047]
The changeover switch 34 (34-1 to 34-12) is controlled by the beam control block 32 (32-1 to
32-12) or the test signal generation circuit 33 (33) according to the control signal sent from the
control unit 10. -1 to 33-12) are connected to the D / A converter 14 (14-1 to 14-12).
[0048]
Also, the sound emission directivity control unit 13 may have a configuration as shown in FIG. 4
(B).
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[0049]
The sound emission directivity control unit 13 includes a plurality of beam control blocks 41
(41-1 to 41-12) and a test signal generation circuit 42.
[0050]
The beam control block 41 (41-1 to 41-12) is a delay processing unit 411 (411-1 to 411-12)
that performs delay processing, and a gain adjustment unit 412 (412-1 to 412-) that performs
amplitude processing. 12) to change the delay amount and the amplitude amount (gain) of the
audio signal according to the control signal from the control unit 10, and output the audio signal.
[0051]
When the control signal is sent from the control unit 10, the test signal generation circuit 42
generates a test audio signal for inspecting each of the speaker units SP1 to SP12.
[0052]
When the sound emission directivity control unit 13 is configured as shown in FIG. 4B, when the
test mode is set, the control unit 10 outputs a control signal to the test signal generation circuit
42 to generate a test voice signal. The control signal for adjusting the gain is output to the gain
adjusting units 412-1 to 412-12, and the test sound is emitted from the speaker units SP 1 to SP
12 in order.
For example, when the test sound is emitted from the speaker unit SP1, a control signal for
setting the gain of the gain adjustment unit 412-1 to a constant value is output, and to the other
gain adjustment units 412-2 to 412-12. On the other hand, it outputs a control signal that sets
the gain to zero.
When the control unit 10 causes the speaker units to emit the test sound in order, the control
unit 10 does not output a control signal for executing the delay processing to each of the delay
processing units 411-1 to 411-12.
[0053]
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Next, an operation of checking the state of each of the speaker units SP1 to SP12 and the
microphone units MIC101 to MIC116 and MIC201 to MIC216 of the audio conference device 1
will be described.
In the following description, the case where the sound emission directivity control unit 13 has
the configuration of FIG. 4A will be described.
[0054]
The audio conference device 1 has two inspection modes, a simple inspection mode and an
automatic inspection mode.
The simple inspection mode is a mode in which the user or the service person can inspect the
speaker units SP1 to SP12 and the microphone units MIC101 to MIC116 and MIC201 to
MIC216 at the installation place of the audio conference apparatus 1.
The automatic inspection mode is a mode in which the inspector automatically inspects the
speaker units SP1 to SP12 and the microphone units MIC101 to MIC116 and MIC201 to
MIC216 when the audio conference apparatus 1 is inspected at the time of shipment.
[0055]
First, the simple inspection mode will be described. The user or the service person can start this
mode by operating the operation unit 4 and setting to execute the simple inspection mode. When
this simple examination mode is set, the audio conference apparatus 1 emits, for example, a scale
and a melody as test voices one by one from the speaker units SP1 to SP12 in order, and all
microphone units MIC101 to MIC116 and MIC201 to MIC216. Pick up at At this time, the audio
conference device 1 causes the display unit 7 to display the speaker unit number in which the
voice is being emitted.
[0056]
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Since the audio conference apparatus 1 operates in this manner, the user or the service person
listens to the test voice emitted one by one from each of the speaker units SP1 to SP12 with his
ear and confirms it, and from which speaker unit The state of each speaker unit can be confirmed
by confirming the display on the display unit 7 as to whether the sound is emitted. Also, as
described above, since different sounds of the scale and melody are sequentially emitted from
each speaker unit, the user or service person listens to this scale or melody with his ear to check
which speaker unit You can easily grasp whether there is an abnormality.
[0057]
Further, in the simple inspection mode, the sound collection beam generation units 181 and 182
are set to detect the level of the sound signal collected by each microphone unit and output the
detected sound signal to the control unit 10. FIG. 5 is a diagram showing the sound collection
levels of the microphone units of the microphone array. FIG. 5 shows sound collection levels of
the respective microphone units when the test sound is emitted from the speaker unit SP6 as an
example. Further, FIG. 5B shows a case where the speaker unit MIC 110 breaks down.
[0058]
As shown in FIG. 5 (A), the level of the sound signal collected by each microphone unit changes
gradually (slowly) according to the positional relationship between the speaker unit emitting
sound and each microphone unit. Do. However, if one of the microphone units breaks down and
the sound can not be collected, or the sound collection level is small, as shown in FIG. 5B, only a
specific microphone unit with respect to the nearby microphone unit Sound collection level drops
extremely. Since the control unit 10 is largely different from the other microphone units as
described above, when the sound collection level is smaller than the preset threshold, the display
unit 7 is reset until it is reset after the end of the simple inspection mode. Display the
microphone unit number. Therefore, the user or the service person confirms the scales and the
melody to be reproduced in order from each of the speaker units SP1 to SP12, and confirms the
display of the display unit 7 when the sound is not heard or is small. , It can be easily grasped
which speaker unit is in a bad condition. In addition, by checking the display unit 7 after the
simple test mode ends, it is possible to confirm the presence or absence of a failure of each
microphone unit.
[0059]
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FIG. 6 is a flowchart for explaining the simple examination mode of the voice conference device.
The audio conference device 1 operates as follows in the simple inspection mode.
[0060]
Here, the test signal generating circuits 33-1 to 33-12 are set to output the audio signal of the
scale as an example of the test voice, and in the simple inspection mode, the speaker units SP1 to
SP12 are in turn On the scale in C major, "D, Re, Mi, Fa, So, La, Si, De, Mi, Fa, So" are emitted in
order. In addition, as a test sound, for example, it is possible to set to emit a melody such as "mi,
fa, so, mi, re, de, re, mi, so, mi, re, de".
[0061]
When the control unit 10 of the audio conference apparatus 1 detects that the simple inspection
mode is set in the operation unit 4, the sound collection beam generation units 181 and 182
have collected sound by the microphone units MIC101 to MIC116 and MIC201 to MIC216. The
level of the audio signal is set to be output to the control unit 10 (s1). In addition, the control unit
10 outputs a control signal to each signal processing unit 31 (31-1 to 31-12) of the sound
emission directivity control unit 13 to generate a test signal generation circuit 33 (33-1 to 33-1).
The changeover switch 34 (34-1 to 34-12) is switched so as to connect 33-12) to the D / A
converter 14 (14-1 to 14-12) (s2). Then, in order to test the speaker units in order, the variable n
is set to 1 (s3).
[0062]
Subsequently, the control unit 10 sequentially outputs control signals to the test signal
generation circuit 33 (33-1 to 33-12) to generate a test audio signal, and the n-th speaker unit is
generated. At the same time, test sound is emitted for a predetermined time (s4), and a control
signal is output to the display unit 7 to display the number or position of the speaker unit
emitting the sound (s5).
[0063]
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That is, the control unit 10 outputs a control signal to the test signal generation circuit 33-1 to
generate a test audio signal, and the first speaker unit SP1 emits the sound of "do" for, for
example, 1 second. Make it sound (s4).
Further, the control unit 10 causes the display unit 7 to display that sound is being emitted from
the speaker unit SP1 (s5).
[0064]
Further, the control unit 10 checks the level of the audio signal collected by all the microphone
units MIC101 to MIC116 and MIC201 to MIC216 (s6), and there is a microphone unit whose
sound collection level is equal to or less than a preset threshold. (S7), the number or position of
that microphone unit on the display unit 7 (for example, what number from the left? ) Is
displayed (s8).
[0065]
When a predetermined time (one second) has elapsed (s9), the control unit 10 stops the test unit
from emitting the test sound (s10), and since the sound emission of the speaker unit SP12 is
completed, it is not necessary (s11) ), The variable n is increased by 1 (s12), and the process after
step s4 is executed again. Further, when the sound emission of the speaker unit SP12 is ended
(s11), the control unit 10 ends the process.
[0066]
As described above, in the audio conference apparatus 1, since the simple inspection mode can
be executed by operating the operation unit 4, the user or the service person can check the states
of the speaker units SP1 to SP12 and the microphone units MIC101 to MIC116 and MIC201 to
MIC216. , Can be easily confirmed without the inspection jig.
[0067]
Next, the automatic inspection mode will be described.
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When the audio conference apparatus 1 receives the execution of the automatic inspection mode
at the operation unit 4, the audio conference apparatus 1 confirms the presence / absence and
polarity of the audio output of all the speaker units constituting the speaker array and the audio
input of all the microphone units constituting the microphone array. Automatically check for
presence and polarity. Then, the voice conference device 1 causes the display unit 7 to display
the examination result. Therefore, the inspector can efficiently perform the operation test of all
the speaker units and all the microphone units of the audio conference device 1.
[0068]
FIG. 7 is a flowchart for explaining the automatic examination mode of the voice conference
device. The audio conference device 1 operates as follows in the automatic examination mode.
[0069]
Here, the test signal generation circuits 33-1 to 33-12 are set to output the sound signal of the
scale as in the simple inspection mode as an example, and the speaker units SP1 to SP12 have
the C major tone. On the scale of "Dee, Re, Mi, Fa, So, La, Si, De, Mi, Fa, So"
[0070]
Here, as shown in FIG. 2, in the audio conference apparatus 1, the microphone units MIC101 to
MIC116 and the microphone units MIC201 to MIC216 are arranged symmetrically with respect
to the speaker units SP1 to SP12 arranged in a straight line. Is the structure being
For example, the microphone unit MIC101 and the microphone unit MIC201 are arranged
symmetrically with respect to the speaker units SP1 to SP12.
[0071]
Therefore, in the present invention, in order to detect that the microphone unit is erroneously
connected in the reverse polarity, the microphone unit MIC101 and the microphone unit
MIC201, the microphone unit MIC102 and the microphone unit MIC202, the microphone unit
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MIC103 and the microphone unit MIC203, The microphone unit MIC 116 and the microphone
unit MIC 216 are divided into groups, and the audio signals collected by the microphone units
are added to each group. As a result, when one of the two microphone units is connected in the
reverse polarity, the test sound of the opposite phase is picked up from the two microphone units
and the test sound cancels out, so the sound collection level of the microphone unit Becomes
smaller. On the other hand, when the two microphone units are correctly connected together, the
test sound of the same phase is collected from the two microphone units, so the collection level
of the test sound becomes large. Therefore, the inspector can easily detect whether or not the
microphone unit is connected in the reverse polarity by confirming the display content of the
display unit 7.
[0072]
When the control unit 10 of the audio conference apparatus 1 detects that the automatic
inspection mode is set in the operation unit 4, the sound collection beam generation units 181
and 182 have collected sound by the respective microphone units MIC101 to MIC116 and
MIC201 to MIC216. The level of the audio signal is set to be output to the control unit 10 (s21).
In addition, the control unit 10 outputs a control signal to each signal processing unit 31 (31-1
to 31-12) of the sound emission directivity control unit 13 to generate a test signal generation
circuit 33 (33-1 to 33-1). The changeover switch 34 (34-1 to 34-12) is switched so as to connect
33-12) to the D / A converter 14 (14-1 to 14-12) (s22). Then, in order to test the speaker units in
order, the variable n is set to 1 (s23).
[0073]
Subsequently, the control unit 10 sequentially outputs control signals to the test signal
generation circuit 33 (33-1 to 33-12) to generate a test audio signal, and the n-th speaker unit is
generated. The test sound is emitted for a certain period of time (S24).
[0074]
That is, the control unit 10 outputs a control signal to the test signal generation circuit 33-1,
generates a test audio signal, and emits the sound of "do" for 1 second from the first speaker unit
SP1. .
[0075]
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The control unit 10 checks the levels of the audio signals collected by all the microphone units
MIC101 to MIC116 and MIC201 to MIC216 (s25), and if the sound collection levels of all the
microphone units are equal to or less than the preset threshold, (S26) Since the test sound is not
emitted from the speaker unit, the number of the speaker unit is stored in the built-in memory
(not shown) (s27).
Then, the emission of the test voice is stopped (s33).
[0076]
In addition, when the sound collection level of any of the microphone units is equal to or less
than the preset threshold (s 28), the control unit 10 has a high possibility of failure, and thus the
built-in memory (not shown) The microphone unit number is stored (s29).
[0077]
Furthermore, the control unit 10 adds the audio signals collected by the two microphone units
arranged symmetrically with respect to the speaker unit emitting the test voice, and as a result,
the audio signal is preset. If it is below the threshold (s30), there is a high possibility that the
connection of one of the microphone units is incorrect, so the number of that microphone unit is
stored in a built-in memory (not shown) (s31).
[0078]
When the predetermined time (one second) has elapsed (s32), the control unit 10 stops the test
unit from emitting the test sound (s33), and since the sound emission of the speaker unit SP12 is
completed, it is not necessary (s34) ), The variable n is incremented by 1 (s35), and the
processing after step s24 is executed again.
Further, when the sound emission of the speaker unit SP12 is finished (s34), the control unit 10
performs the following process.
[0079]
The control unit 10 sets the variable n to 1 (s36) in order to test the speaker unit in order as the
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next process (s36), and the test signal generation circuit 33 (33-1 to 33-12) is The control signal
is output in order two by two to generate a test audio signal (s37).
That is, the control unit 10 outputs a control signal to the test signal generation circuits 33-1 and
33-2 to generate a test audio signal, and the sound of "do" from the speaker units SP1 and SP2 is
generated for one second. Make a noise.
[0080]
Here, when the connection of one of the two speaker units is erroneously in the reverse polarity,
the phase of the sound emitted from one of the speaker units is inverted, so the two speaker
units When the sound is picked up by the microphone unit placed between the two, the left and
right localized sound is canceled and disappears because the sound localized at the center is
canceled because the sound is emitted at the same volume from the left and right, or The sound
collection level of the audio signal is very low.
[0081]
On the other hand, when the two speaker units both have the correct polarity, the sounds emitted
from the two speaker units do not cancel each other, so the sound collection levels of the sound
signals emitted from the two speaker units are constant. It becomes more than the value.
[0082]
Therefore, in order to detect that the speaker unit is connected in the reverse polarity, the control
unit 10 of the audio conference device 1 collects the microphone unit MIC101 / MIC201
disposed between the speaker unit SP1 and the speaker unit SP2. Check the level of the sound
signal produced (s38).
[0083]
If the sound collection levels of the two microphone units are equal to or less than the preset
threshold (s39), the control unit 10 stores the number of the speaker unit in the built-in memory
(s40) (s40).
[0084]
In addition, the control part 10 does not memorize ¦ store the number of a speaker unit, when
the sound collection level of two microphone units is larger than a threshold value (s39).
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[0085]
When a predetermined time (one second) elapses (s41), the control unit 10 stops the test unit
from emitting the test sound from the speaker units SP1 and SP2 (s42), and the test unit
generates the test sound as the speaker unit. If it is not SP11 and SP12 (s43), the variable n is
increased by 1 (s44), and the processing after step s37 is executed again.
[0086]
On the other hand, if the control unit 10 is the speaker unit SP11 or SP12 (S43), the control unit
10 causes the display unit 7 to display the number or the position of the microphone unit or the
speaker unit having the abnormality. (S45).
Then, the automatic inspection process is ended.
[0087]
As described above, the voice conference device 1 can automatically inspect the states and
polarities of the microphone unit and the speaker unit, so that the shipping process can be
performed very efficiently.
[0088]
In addition, after the automatic inspection, in order to reconfirm the state of the speaker unit, the
inspector executes the simple inspection mode to confirm by ear whether or not each speaker
unit can emit the test sound. be able to.
[0089]
As described above, when the audio conference apparatus 1 executes the simple inspection
mode, the scale and the melody are reproduced in order from each speaker unit. Therefore, when
the user or the service person confirms the state of the speaker unit or the microphone unit, The
state of the speaker unit can be easily confirmed.
In addition, by collecting the sound emitted by the speaker unit with the microphone unit, the
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state of the microphone unit can also be confirmed.
[0090]
Moreover, since the audio conference apparatus 1 can inspect not only the wire connection state
of each speaker unit or each microphone unit but also the polarity when the automatic inspection
mode is performed, the shipment inspection can be performed efficiently.
[0091]
It is a three-view showing the external appearance of a voice conference apparatus.
It is the figure which showed the speaker unit arrangement ¦ positioning and microphone unit
arrangement ¦ positioning of the audio conference device shown in FIG.
It is a functional block diagram of an audio conference device.
It is a block diagram which shows the structure of the test circuit which inputs a test audio ¦
voice to a speaker unit.
It is a figure which shows the sound collection level of each microphone unit of a microphone
array.
It is a flow chart for explaining simple examination mode of a voice conference device.
It is a flow chart for explaining automatic examination mode of a voice conference device.
Explanation of sign
[0092]
1-voice conference apparatus 2-case 3-leg section 4-operation section 5-light emission section 7-
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display section 10-control section 11-input / output connector 12-input / output I / F 13-sound
emission directivity control section 14 -D / A converter 15-amplifier for sound emission 16amplifier for sound collection 17-A / D converter 19-sound collection beam selection unit 20echo cancellation unit 21-echo canceller 31-signal processing unit 32-beam control block 33 ,
42-Test signal generation circuit 34-Switch 41-Beam control block 181, 182-Sound collection
beam generation unit 411-Delay processing unit 412-Gain adjustment unit
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