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DESCRIPTION JP2014158153

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DESCRIPTION JP2014158153
Abstract: To provide a sound data processing device capable of easily executing processing
according to an external device connected with itself. In a sound data processing device including
a speaker, a first connection terminal, a second connection terminal, and a third connection
terminal, a first device which is a device connected via the first connection terminal is other than
the other device. It is judged based on at least the first voltage whether or not it is a sound data
processing device (S1, S2). Whether to allow input / output of sound data via the third
connection terminal is switched according to the determination result (S3, S6, S7). It is
determined based on the second voltage whether the second device, which is a device connected
via the second connection terminal, is another sound data processing device (S5, S9). Depending
on the determination result, it is switched whether or not the sound is output by the speaker
(S10, S12, S15). [Selected figure] Figure 3
Sound data processing device
[0001]
The present invention relates to a sound data processing device provided with a plurality of
connection terminals.
[0002]
A speakerphone system capable of simultaneously using a plurality of speakerphones is known
(see, for example, Patent Document 1).
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In the speakerphone system described in Patent Document 1, a plurality of speakerphones can be
connected in series to one telephone set. That is, a plurality of speakerphones can be connected
by a so-called daisy chain. Specifically, one most upstream speaker phone can be connected to
the earphone terminal of the telephone. Each of the plurality of speakerphones can be connected
in series via a round three-pole connector of the same diameter and audio standard.
[0003]
JP 2004-242012 A
[0004]
There are various uses for speakerphones.
For example, in addition to the case where the speakerphone is used in a daisy chain as described
above, it may be used in connection with other external devices such as a personal computer (PC)
and a portable terminal. In the speaker phone system described in Patent Document 1 described
above, it is assumed that one speaker phone is connected to a telephone or another speaker
phone, but it may be connected to another external device. It was not done. Therefore, in the
speakerphone system described in Patent Document 1, there is a possibility that the
speakerphone can not be connected to the other external device. Even if the speakerphone can
be connected to another external device, it is assumed that the setting for causing the
speakerphone to execute desired processing according to the external device becomes
complicated.
[0005]
An object of the present invention is to provide a sound data processing device capable of easily
executing processing according to an external device connected to itself.
[0006]
A sound data processing apparatus according to an aspect of the present invention includes a
speaker that outputs a sound based on sound data that is data representing a sound, and a
terminal that can alternatively be connected to at least another sound data processing apparatus
and a portable terminal. The first connection terminal, which is a terminal provided with a first
output unit capable of outputting sound data and an input unit capable of inputting sound data,
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at least another sound data processing device and sound based on the sound data A second
output unit capable of outputting sound data, a second output unit capable of outputting sound
data, and an input / output unit capable of inputting or outputting sound data according to the
connected device; And a third connection terminal which is a terminal capable of inputting and
outputting sound data, and which is a terminal of another standard different from each of the
first connection terminal and the second connection terminal. , The device connected via the first
connection terminal A first determination unit that determines whether one device is another
sound data processing device based on at least a first voltage that is a voltage caused by the first
device being connected to the first connection terminal. And the second device is connected to
the second connection terminal as to whether or not the second device, which is the device
connected via the second connection terminal, is another sound data processing apparatus.
Whether to permit the input / output of sound data via the third connection terminal according
to the determination result of the second determination means to be determined based on the
second voltage that is the resulting voltage and the first determination means And second
switching control means for switching whether or not the speaker outputs a sound according to
the determination result of the second determining means.
[0007]
The sound data processing apparatus of this aspect includes a first connection terminal and a
second connection terminal, and a plurality of sound data processing apparatuses can be
connected in series using both of them.
At this time, the other sound data processing devices connected to the sound data processing
device may be the same sound data processing device, or may be sound data processing devices
having different configurations.
The sound data processing apparatus further includes a third connection terminal, and can input
and output sound data through the third connection terminal. The sound data processing device
can input / output sound data via the third connection terminal in a state where a plurality of
sound data processing devices are connected in series. The sound data processing device
automatically determines whether to allow input / output of sound data via the third connection
terminal according to whether or not another sound data processing device is connected to the
first connection terminal. It can be switched. The sound data processing device can automatically
switch whether or not to output a sound from the speaker according to whether or not another
sound data processing device is connected to the second connection terminal. Therefore, the
sound data processing apparatus can easily execute processing according to the external
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apparatus connected to itself, as compared with the case where the user manually performs the
switching.
[0008]
In the sound data processing apparatus according to the present aspect, the first switching
control unit is configured to receive the third connection terminal when the first determination
unit determines that the first device is another sound data processing apparatus. It is not
necessary to input and output sound data via the interface.
[0009]
When another sound data processing device is connected to the first connection terminal, a part
of the daisy chain, in particular, constitutes a downstream device of the other sound data
processing device connected to the first connection terminal It is assumed.
Therefore, the sound data processing apparatus in this case prohibits the process of inputting
and outputting sound data through the third connection terminal when another sound data
processing apparatus is connected to the first connection terminal. As a result, the sound data
processing apparatus avoids the sound data being input from the third connection terminal, and
based on the sound data, reproducing a sound different from that of the other sound data
processing apparatus on the upstream side configuring the daisy chain be able to. Further, when
another sound data processing device is connected to the first connection terminal, the sound
data processing device prohibits outputting sound data to the other device through the third
connection terminal. For this reason, in the sound data processing apparatus forming the daisy
chain, control of processing of outputting sound data to another apparatus through the third
connection terminal is made in comparison with the case where input / output of sound data is
permitted individually. Can.
[0010]
In the sound data processing apparatus according to the present aspect, a microphone for
converting surrounding sound into sound data, sound data input from the input unit of the first
connection terminal, and the input / output unit of the second connection terminal The first
switching means may further include first combining means capable of electrically adding the
input sound data and the sound data generated by the microphone, wherein the first switching
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control means is configured to When it is determined that the first device is not the other sound
data processing device, the first device permits sound data to be input / output via the third
connection terminal, and the sound data is received via the third connection terminal. When
outputting, sound data synthesized by the first synthesizing means may be outputted. The sound
data processing device in this case can permit input / output of sound data via the third
connection terminal when it is determined that the device itself is the most upstream device in
the daisy chain. At this time, the sound data output via the third connection terminal is sound
data synthesized by the synthesizing means. For this reason, in the sound data processing
apparatus forming the daisy chain, control of processing of outputting sound data to another
apparatus through the third connection terminal is attempted as compared to the case where
input / output of sound data is permitted individually. be able to.
[0011]
In the sound data processing device according to the present aspect, the second determination
unit determines which of the other sound data processing device and the sound output device the
second device is based on the second voltage, and The second switching control means may not
cause the speaker to output a sound when it is determined by the second determination means
that the second device is the sound output device. The sound data processing device in this case
does not output sound from the speaker when the second device is a sound output device. The
sound data processing apparatus can save time and labor of the user manually switching whether
or not to output the sound by the speaker according to the second device.
[0012]
In the sound data processing device according to the present aspect, the first determination unit
determines which of the other sound data processing device and the portable terminal the first
device is based on at least the first voltage, When it is determined by the first determination unit
that the first device is the portable terminal, a sound represented by the sound data at the time of
outputting the sound data through the first output unit of the first connection terminal The
apparatus may further include sound data adjusting means for reducing the size of the first
device as compared with the case where the first device is determined to be the other sound data
processing apparatus by the first determining means.
[0013]
The portable terminal may be provided with a circuit that amplifies the magnitude of the sound
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represented by the sound data.
In such a case, when sound data of a volume suitable for being reproduced by another sound
data processing apparatus is output to the portable terminal, the sound is too loud when the
sound data is reproduced by the portable terminal. On the other hand, in the sound data
processing apparatus in this case, when the first device is a portable terminal, it is determined
that the first device is another sound data processing device, the magnitude of the sound
represented by the sound data. It can be made smaller than when it is done. As a result, the
sound data processing device can avoid the situation that the volume of the sound is too large
even when the sound data output from the sound data processing device is reproduced by the
mobile phone.
[0014]
In the sound data processing apparatus according to the present aspect, a detection unit that
mechanically detects whether the first device is connected to the first connection terminal, the
first determination unit includes the first voltage, and the detection It may be determined
whether the first device is another sound data processing device or the portable terminal based
at least on the detection result by the means.
[0015]
When the portable terminal is connected to the first connection terminal, a voltage is applied
from the portable terminal, so the first voltage is higher than when the portable terminal is not
connected to the first connection terminal.
On the other hand, depending on the configuration of the sound data processing device, the first
voltage when another sound data processing device is connected to the first connection terminal,
and the other voltage data processing device is not connected to the first connection terminal
And the first voltage may be similar. In such a configuration, it is not possible to distinguish
whether another sound data processing device is connected to the first connection terminal or
nothing is connected only by the first voltage. On the other hand, the sound data processing
device can detect that another sound data processing device is connected to the first connection
terminal based on the first voltage and the detection result of the detection means.
[0016]
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In the sound data processing apparatus according to this aspect, a reference power supply for
applying a reference voltage, a pull-up resistor electrically connected between the reference
power supply, and the input / output unit of the second connection terminal is further provided.
The second determination unit may set a voltage of a voltage determination end that is an end
opposite to the reference power supply side of the pull-up resistor as the second voltage, based
on the second voltage. It may be determined whether the device is another sound data
processing device or the sound output device. In the sound data processing device in this case,
the second voltage is applied in the case where nothing is connected to the second connection
terminal, in the case where the sound output device is connected, and in the case where another
sound data processing device is connected. Is different. For this reason, the sound data
processing device has a relatively simple configuration, based on the second voltage, when
nothing is connected to the second connection terminal, when the sound output device is
connected, and other sound data processing It is possible to distinguish between when the device
is connected.
[0017]
In the sound data processing apparatus according to the present aspect, a second combining unit
that combines sound data input through the input unit of the first connection terminal and sound
data input through the third connection terminal. And a first path connecting a path connected to
the input / output portion of the second connection terminal with the first output portion of the
first connection terminal according to the determination result of the second determination
means; Switching means for switching to any one of the second path connected to the second
combining means, and the switching means when the second device is determined to be the
sound output device by the second determining means Third switching control means for
controlling to switch the path to which the input / output unit of the second connection terminal
is connected to the second path, the voltage determination end on the second path, and the
second combination And a capacitor provided between the Good. In the sound data processing
apparatus in this case, when the sound output device is connected to the second connection
terminal, the path to which the input / output unit of the second connection terminal is
connected can be automatically switched to the second path. Then, in the sound data processing
device, the capacitor of the voltage determination end on the second path and the synthesizing
means is provided, so that after the sound output device is connected to the second connection
terminal, the connection of the sound output device is released. If so, the second voltage can be
reliably returned to the reference voltage. Therefore, when the sound output device is
disconnected, the sound data processing device ensures that the second determination unit can
not appropriately determine that the second voltage does not become the reference voltage. It
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can be avoided.
[0018]
FIG. 1 is a schematic configuration diagram of a voice conference system 100. FIG. 2 is a block
diagram showing an electrical configuration of the speakerphone 1; It is a flowchart of main
processing.
[0019]
Hereinafter, a speakerphone 1 embodying the present invention will be described with reference
to the drawings. The drawings referred to are used to explain the technical features that can be
adopted by the present invention. The configuration of the described apparatus, flowcharts of
various processes, and the like are merely illustrative examples.
[0020]
First, a schematic configuration of the audio conference system 100 will be described with
reference to FIG. The audio conference system 100 includes a plurality of communication devices
80 connectable to the network 9 (for example, the Internet). In the present embodiment, a
general-purpose notebook personal computer is employed as an example of the communication
device 80. Of the plurality of communication devices 80, only the communication device 83 may
or may not be connected to the network 9. In FIG. 1, five communication devices of
communication devices 81 to 85 are illustrated as the plurality of communication devices 80, but
the number of communication devices 80 is not limited to five. Hereinafter, when the plurality of
communication devices 81 to 85 are generically referred to and any one of the plurality of
communication devices 81 to 85 is referred to without being specified, it is referred to as
“communication device 80”.
[0021]
In the present embodiment, the plurality of communication devices 80 can establish a connection
according to, for example, Session Initiation Protocol (SIP), and can carry out an audio conference
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by transmitting and receiving sound data. Note that the communication device 80 may be
capable of carrying out a video conference by transmitting and receiving video data in addition to
sound data. The plurality of communication devices 80 may establish a connection via a SIP
server (not shown) that performs call control conforming to SIP, or may establish a connection
without via a SIP server. Further, image data of the material created by the document creation
application and the drawing application is transmitted and received among the plurality of
communication devices 80 connected to each other, and the images of the material are displayed
in common by the plurality of communication devices 80. It is also possible. Thus, the conference
can be performed while referring to the material (hereinafter referred to as a shared material)
displayed in common by the plurality of communication devices 80 as in the case of a normal
conference. Details of processing in the communication device 80 at the time of the conference
will be described later.
[0022]
The speakerphone 1 can be connected to the communication device 80. The speakerphone 1 is a
portable music terminal and a personal computer (hereinafter referred to as a PC). Etc.) based on
the sound data output from the external device. The speakerphone 1 generates sound data
representing ambient sound, and has an output function of outputting the sound data to an
external device. The speakerphone 1 is used, for example, in an application such as an audio
conference and a telephone conversation with a user at another place. The speakerphone 1
includes a first connection terminal 10, a second connection terminal 20, and a third connection
terminal 30. In FIG. 1, each of the first connection terminal 10, the second connection terminal
20, and the third connection terminal 30 is indicated by a white square, a black square, and a
hatched square. The speakerphone 1 can be connected in a beaded connection using the first
connection terminal 10 and the second connection terminal 20. Therefore, the speakerphones 1
can increase the number of speakerphones 1 capable of simultaneously reproducing the same
sound data by daisy-chaining each other. In the present embodiment, when the speakerphone 1
constitutes a part of a daisy chain, the first connection terminal 10 is a terminal for connecting to
another speakerphone 1 on the upstream side. The upstream side is the communication device
80 side connected to the network 9. More specifically, in the speakerphone 3 among the
speakerphones 2 to 4 connected in a daisy chain, the other speakerphone 1 on the upstream side
is the speakerphone 2. The second connection terminal 20 is a terminal for connection to
another downstream speakerphone 1. More specifically, in the speakerphone 3 among the
speakerphones 2 to 4 connected in a daisy chain, the other speakerphone 1 on the downstream
side is the speakerphone 4.
[0023]
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The speakerphone 2 is connected to the communication device 81 in the audio conference
system 100. The speakerphone 3 is connected to the speakerphone 2. The speakerphone 4 is
connected to the speakerphone 3. The speakerphone 5 is connected to the communication device
82. The portable terminal 91 and the speaker phone 6 are connected to the speaker phone 5. A
communication device 83 and a sound output device 93 are connected to the speakerphone 6.
The speakerphone 7 is connected to the communication device 84. A portable terminal 92 and a
sound output device 94 are connected to the speakerphone 7. The speakerphone 8 is connected
to the communication device 85. A sound output device 95 is connected to the speakerphone 8.
The mobile terminal 91 and the mobile terminal 92 are, for example, a mobile phone and a
smartphone. The sound output devices 94 and 95 are sound output devices of a type worn and
used by the user. The sound output device 94 is, for example, headphones, headphones with a
microphone (headset), and earphones. Hereinafter, when the plurality of speakerphones 2 to 8
are generically referred to and any one of the plurality of speakerphones 2 to 8 is referred to
without being specified, it is referred to as “speakerphone 1”.
[0024]
The electrical configuration of the speakerphone 1 will be described with reference to FIG. In
order to simplify the description, it is assumed that the speakerphones 1 of the present
embodiment have the same configuration. The speakerphone 1 includes a CPU 41, a ROM 42, a
RAM 43 and a USB interface 44. The ROM 42, the RAM 43, and the USB interface 44 are
connected to the CPU 41. The ROM 42 stores various program data and the like. Temporary data
is stored in the RAM 43.
[0025]
The speakerphone 1 further includes a first connection terminal 10, a second connection
terminal 20, and a third connection terminal 30. The first connection terminal 10 can be
alternatively connected to at least another speakerphone 1 and a portable terminal. The first
connection terminal 10 may be connectable to other devices than the speakerphone 1 and the
portable terminal. The first connection terminal 10 of the present embodiment is a four-pole
connector including an insertion / extraction detection unit 11, a first output unit 12, and an
input unit 13. A four-pole plug provided at one end of a cable connected to an external device
can be connected to the first connection terminal 10. The insertion and removal detection unit
11 mechanically detects whether or not the first connection terminal 10 is connected. Although
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not shown, the insertion / removal detection unit 11 is electrically connected to the CPU 41, and
inputs the detection result to the CPU 41. The first output unit 12 can output sound data to an
external device connected via the first connection terminal 10. The input unit 13 can input sound
data from an external device connected via the first connection terminal 10. The four-pole plug
has a ground terminal (hereinafter referred to as a GND terminal), an Lch terminal, an Rch
terminal, and a microphone terminal. The Lch terminal is a terminal for inputting a left channel
(Lch) sound. The Rch terminal is a terminal for inputting the sound of Rch (Right channel). The
speakerphone 1 can transmit, for example, sound data to another speakerphone 1 or a portable
terminal connected to the first connection terminal 10 via the microphone terminal of the fourpole plug and the first output unit 12 . In addition, the speakerphone 1 acquires sound data
transmitted from, for example, another speakerphone 1 or a portable terminal connected to the
first connection terminal 10 through the Lch terminal, the Rch terminal, and the input unit 13.
Can.
[0026]
The second connection terminal 20 is a terminal that can be alternatively connected to at least
another speakerphone 1 and a sound output device. The first connection terminal 10 may be
connectable to other devices than the speakerphone 1 and the sound output device. The second
connection terminal 20 is a three-pole connector including an input / output unit 21 and a
second output unit 22. The input / output unit 21 can input or output sound data in accordance
with an external device connected to the second connection terminal 20. When another
speakerphone 1 is connected to the second connection terminal 20, the input / output unit 21
can input sound data output from the other speakerphone 1. When the sound output device is
connected to the second connection terminal 20, the input / output unit 21 can output sound
data. The second output unit 22 can output sound data to an external device connected via the
second connection terminal 20. The second connection terminal 20 can be connected to a threepole plug provided at one end of a cable connected to an external device.
[0027]
The third connection terminal 30 is a terminal capable of inputting and outputting sound data,
and is a terminal of a standard different from each of the first connection terminal 10 and the
second connection terminal 20. The third connection terminal 30 of the present embodiment is a
terminal of USB (Universal Serial Bus) standard. For example, the communication device 80 or
the power supply device is connected to the third connection terminal 30.
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[0028]
The speakerphone 1 further includes a built-in microphone 45, speakers 46, combining circuits
51 to 53, variable gain amplifiers 54 to 56, switches 61 to 65, a reference power supply (Vref)
47, a pull-up resistor 48 and a capacitor 49. The built-in microphone 45 converts surrounding
sound into sound data. The speaker 46 reproduces the sound based on the sound data. The
synthesis circuits 51 to 53 have a function of electrically adding sound data. Specifically, the
synthesis circuit 51 is connected to the input / output unit 21 of the second connection terminal
20, the built-in microphone 45, and the USB interface 44, and has a function of electrically
adding together the sound data input from each. The synthesis circuit 52 is connected to the
input unit 13 of the first connection terminal 10 and the USB interface 44, and has a function of
electrically adding together the sound data input from each. The synthesis circuit 53 is connected
to the input unit 13 of the first connection terminal 10, the built-in microphone 45, and the input
/ output unit 21 of the second connection terminal 20, and has a function of electrically adding
together the sound data input from each.
[0029]
The variable gain amplifiers 54 to 56 adjust the gain of the sound data in accordance with an
instruction from the CPU 41, and amplify the sound data according to the adjusted gain. The
variable gain amplifier 54 is provided between the combining circuit 51 and the first output unit
12. The variable gain amplifier 55 is provided between the combining circuit 52 and the second
output unit 22. The variable gain amplifier 56 is provided between the synthesis circuit 52 and
the speaker 46.
[0030]
The switch 61 is provided between the input / output unit 21 of the second connection terminal
20 and the combining circuit 51. The switch 61 is responsive to a command from the CPU 41 to
connect either the path connecting the input / output unit 21 with the path connecting the input
/ output unit 21 and the synthesis circuit 51 or the path connecting the input / output unit 21
and the synthesis circuit 52. Switch to The switch 62 is provided between the second output 22
of the second connection terminal 20 and the combining circuit 52. The switch 62 connects a
path connecting the second output portion 22 of the second connection terminal 20 with the
second output portion 22 and the combining circuit 52 in response to a command from the CPU
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41, a second output portion 22 and a variable It switches to one of the paths connecting the gain
amplifier 55. The switch 63 is provided between the combining circuit 52 and the speaker 46.
The switch 63 switches the path connecting the combining circuit 52 to either the path
connecting the combining circuit 52 and the speaker 46 or the path connecting the combining
circuit 52 and the second connection terminal 20 according to an instruction from the CPU 41. .
The switch 64 is provided between the USB interface 44 and the synthesis circuit 51. The switch
64 switches between interruption and connection of a path for transmitting sound data from the
USB interface 44 to the synthesis circuit 51 in accordance with an instruction from the CPU 41.
The switch 65 is provided between the combining circuit 53 and the USB interface 44. The
switch 65 switches between interruption and connection of a path for transmitting sound data
from the synthesis circuit 53 to the USB interface 44 in accordance with an instruction from the
CPU 41.
[0031]
The reference power supply 47 applies a reference voltage. The reference voltage is, for example,
1.6V. The pull-up resistor 48 is a resistor electrically connected between the reference power
supply 47 and the input / output unit 21 of the second connection terminal 20. The reference
power supply 47 and the pull-up resistor 48 are provided to determine the type of the external
device connected to the second connection terminal 20 based on the voltage (second voltage) of
the voltage determination end 57. The voltage determination end 57 is an end of the pull-up
resistor 48 opposite to the reference power supply 47 side. The capacitor 49 is provided
between the voltage determination end 57 and the combining circuit 52. The capacitor 49 is
provided to reliably return the second voltage to the reference voltage when the sound output
device is disconnected from the second connection terminal 20.
[0032]
The main processing of the speakerphone 1 will be described with reference to FIG. The main
process is a process executed by each of the plurality of speakerphones 1 in the audio
conference system 1. The main processing shown in FIG. 1 starts when the power of the
speakerphone 1 is turned on and ends when the power is turned off. The main processing is
executed by the CPU 41 based on a program stored in the ROM 42.
[0033]
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As shown in FIG. 3, the CPU 41 first determines whether the first device is connected to the
speakerphone 1 based on the detection result of the insertion / extraction detection unit 11 (S1).
The first device is a device connected to the speakerphone 1 via the first connection terminal.
When a portable terminal is connected to the first connection terminal 10, a voltage is applied to
the speakerphone 1 from the portable terminal. Therefore, the first voltage is higher than when
the portable terminal is not connected to the first connection terminal 10. Become. The first
voltage is a voltage resulting from the connection of the first device to the first connection
terminal 10. On the other hand, depending on the configuration of the speakerphone 1, the first
voltage when another speakerphone 1 is connected to the first connection terminal 10 and the
case where the other speakerphone 1 is not connected to the first connection terminal 10 The
first voltage may be similar. Therefore, the speakerphone 1 of the present embodiment detects
the presence / absence of the first device based on the detection result of the insertion /
extraction detection unit 11 in the process of S1.
[0034]
The case where the first device is not connected to the speakerphone 1 (S1: NO) will be described
later. When the first device is connected to the first connection terminal 10 as in the
speakerphones 3 to 7 of FIG. 1 (S1: YES), the CPU 41 determines whether the first voltage is 1 V
or more (S2) . In the present embodiment, the voltage at the detection point 58 is taken as a first
voltage. The detection point 58 is assumed to be between the variable gain amplifier 54 and the
first output unit 12. The detection point 58 is connected to the CPU 41 by a signal line, and the
first voltage is input to the CPU 41. The value of the first voltage is acquired by an A / D
converter (not shown) provided inside the CPU 41. The first voltage is different when the first
device is another speaker phone 1 and when it is a mobile phone. Specifically, when the first
device is a portable terminal, a voltage is applied to the speakerphone 1 from the portable
terminal, so the first voltage is higher than when the portable terminal is not connected to the
first connection terminal 10 Get higher. On the other hand, in the present embodiment, when the
first device is another speaker phone 1, the first voltage when another speaker phone 1 is
connected to the first connection terminal 10, and the external device to the first connection
terminal 10. The first voltage when not connected is the same. Therefore, it is determined
whether the first device is a portable terminal or another speaker phone 1 by the processing of
S2. The threshold of the first voltage in S2 is set in consideration of the type of the first device, in
particular, whether it is a portable terminal or another speaker phone. For this reason, the
threshold value in S2 may be appropriately changed according to the type of the first device, the
determination accuracy, and the like.
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[0035]
The case where the first voltage is less than 1 V (S2: NO) will be described later. In the
speakerphones 5 and 7 of FIG. 1, it is determined that the first voltage is 1 V or more (S2: YES).
The CPU 41 outputs a command to each of the switches 64 and 65 to close each of the switches
64 and 65 (S3). By the process of S3, sound data can be input / output through the third
connection terminal 30. The CPU 41 outputs a command for setting the gain of the variable gain
amplifier 54 small to the variable gain amplifier 54 (S4). By the process of S4, the gain of the
variable gain amplifier 54 is set to small. When the gain is set to be small, the amplification
factor of the sound data in the variable gain amplifier 54 becomes smaller than when the gain is
set to be large. Therefore, when the same sound data is input to the variable gain amplifier 54,
when the gain is set to small, the sound represented by the sound data passed through the
variable gain amplifier 54 is smaller than when the gain is set to large. The size is small. The
process of S4 is a process taking into consideration that the portable terminal is provided with a
circuit for increasing the magnitude of the sound represented by the sound data.
[0036]
The CPU 41 determines whether the second voltage is 0.3 V or more (S5). The second voltage is
a voltage resulting from the connection of the second device to the second connection terminal
20. The second device is a device connected via the second connection terminal 20. In the
present embodiment, the voltage of the voltage determination end 57 is taken as a second
voltage. It is assumed that the voltage determination end 57 is between the input / output unit
21 and the switch 61. The voltage determination end 57 is connected to the CPU 41 by a signal
line, and the second voltage is input to the CPU 41. The second voltage is different between the
case where the second device is a sound output device and the case where the second device is
another speaker phone 1. When an external device is not connected to the second connection
terminal 20, the second voltage is a reference voltage. In the present embodiment, when the
second device is another speakerphone 1, the second voltage is about 0.7V. In the present
embodiment, when the second device is a sound output device, the second voltage is about 0V. In
addition, the threshold value used by the process which specifies a 2nd apparatus based on a
2nd voltage is not limited to said 0.3V, You may be changed suitably. The value of the second
voltage is acquired by an A / D converter (not shown) provided inside the CPU 41.
[0037]
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In the speakerphone 5 of FIG. 1, it is determined that the second voltage is 0.3 V or more (S5:
YES). In this case, it is assumed that no external device is connected to the second connection
terminal 20 or another speaker phone 1 is connected. The CPU 41 outputs a command to the
switch 63, and connects the speaker 46 and the synthesis circuit 52 to the switch 63 (S10). By
the process of S10, the speaker 46 can reproduce the sound based on the sound data. The CPU
41 outputs a command to the switch 61, and the switch 61 connects the input / output unit 21
of the second connection terminal 20 and the combining circuit 51 (S11). The CPU 41 outputs a
command to the switch 62, and causes the switch 62 to connect to the combining circuit 52
without passing through the second output portion 22 of the second connection terminal 20 and
the variable gain amplifier 55 (S11). By the process of S11, the path to which the input / output
unit 21 of the second connection terminal 20 is connected becomes a first path to be connected
to the first output unit 12 via the combining circuit 51.
[0038]
In the speakerphone 7 of FIG. 1, it is determined that the second voltage is less than 0.3 V (S5:
NO). In this case, the CPU 41 outputs a command to the switch 63, and connects the combining
circuit 52 and the second connection terminal 20 (S12). By the process of S12, the speaker 46
can not reproduce the sound based on the sound data. The CPU 41 outputs a command to the
switch 61, and connects the input / output unit 21 of the second connection terminal 20 and the
capacitor 49 to the switch 61 (S13). The CPU 41 outputs a command to the switch 62, and the
switch 62 connects the path connecting the combining circuit 52 via the second output portion
22 of the second connection terminal 20 and the variable gain amplifier 55 (S13). By the process
of S13, the path to which the input / output unit 21 of the second connection terminal 20 is
connected becomes a second path to be connected to the combining circuit 52 via the con sensor
49.
[0039]
In each of the speakerphones 3, 4 and 6 in FIG. 1, the first device is connected to the
speakerphone 1 (S1: YES), and it is determined that the first voltage is less than 1 V (S2: NO). In
this case, the CPU 41 outputs a command to each of the switches 64 and 65 to open each of the
switches 64 and 65 (S6). By the process of S6, input / output of sound data via the third
connection terminal 30 becomes impossible.
[0040]
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In the speakerphones 2 and 8 of FIG. 1, it is determined that the first device is not connected to
the speakerphone 1 (S1: NO). In this case, no other speakerphone 1 is connected to the upstream
side of the speakerphone 1. Therefore, the CPU 41 performs the same process as the process of
S3 (S7). After S6 or S7, the CPU 41 outputs a command for setting the gain of the variable gain
amplifier 54 to the variable gain amplifier 54 (S8). The amplification factor of the variable gain
amplifier 54 is set to be large by the process of S8. When the gain is set to be large, the
amplification factor of the sound data in the variable gain amplifier 54 becomes larger than when
the gain is set to be small.
[0041]
The CPU 41 determines whether the second voltage is 0.3 V or more (S9). In the speakerphones
6 and 8 of FIG. 1, it is determined that the second voltage is less than 0.3 V (S9: NO), and the
process of S12 described above is performed. In the speakerphones 2 to 4 of FIG. 1, it is
determined that the second voltage is 0.3 V or more (S9: YES), and the processes of S14 and S15
are performed. The process of S14 is the same as S10, and the process of S15 is the same as S11.
If one of S11, S13, and S15 has not been input (S18: NO), the CPU 41 returns the process to S1.
The termination instruction is input when the power of the speakerphone 1 is turned off. If the
end instruction is input (S18: YES), the CPU 41 ends the main processing.
[0042]
The speakerphone 1 corresponds to the sound data processing device of the present invention.
The built-in microphone 45 and the speaker 46 correspond to the microphone and the speaker
of the present invention, respectively. The first connection terminal 10, the first output unit 12,
and the input unit 13 correspond to the first connection terminal, the first output unit, and the
input unit of the present invention, respectively. The second connection terminal 20, the input /
output unit 21, and the second output unit 22 correspond to the second connection terminal, the
input / output unit, and the second output unit of the present invention. The third connection
terminal 30 corresponds to the third connection terminal of the present invention. The CPU 41
that executes the processes of S1 and S2 functions as a first determination unit of the present
invention. The CPU 41 that executes the processes of S5 and S9 functions as a second
determination unit of the present invention. The CPU 41 which executes the processes of S3, S6
and S7 functions as a first switching control means of the present invention. The CPU 41 that
executes the processes of S10, S12 and S14 functions as a second switching control means of the
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present invention. The synthesis circuit 53 functions as a first synthesis means of the present
invention. The CPU 41 that executes the process of S4 functions as sound data adjustment means
of the present invention. The insertion and removal detection unit 11 corresponds to the
detection means of the present invention. The reference power supply 47, the pull-up resistor 48
and the capacitor 49 respectively correspond to the reference power supply, the pull-up resistor
and the capacitor of the present invention. The synthesis circuit 52 functions as a second
synthesis means of the present invention. The switch 61 corresponds to the switching means of
the present invention. CPU41 which performs processing of S13 functions as the 3rd change
control means of the present invention.
[0043]
The speakerphone 1 according to the above-described embodiment includes the first connection
terminal 10 and the second connection terminal 20, and can use the both to connect a plurality
of speakerphones 1 in series. The speakerphone 1 further includes a third connection terminal
30, and can input and output sound data through the third connection terminal 30. The
speakerphone 1 can input and output sound data through the third connection terminal 30 in a
state where the plurality of speakerphones 1 are daisy-chained. The speakerphone 1
automatically determines whether to allow input / output of sound data via the third connection
terminal 30 depending on whether the other speakerphone 1 is connected to the first connection
terminal 10 It can be switched. The speakerphone 1 can automatically switch whether or not to
output a sound from the speaker 46 in accordance with whether or not another speakerphone 1
is connected to the second connection terminal 20. For this reason, the speakerphone 1 can
easily execute the processing according to the device connected to itself as compared with the
case where the user manually performs the switching.
[0044]
When the speakerphone 1 is connected to another speakerphone 1 via the first connection
terminal 10, the speakerphone 1 is a part of a daisy chain, and another speaker connected via the
first connection terminal 10 It is assumed that the device downstream of the phone 1 is
configured. Therefore, the speakerphone 1 determines whether the first device is the
speakerphone 1 based on the detection result of the insertion / extraction detection unit 11 and
the first voltage (S1: YES, S2: NO). When the speakerphone 1 is connected to the other
speakerphone 1 via the first connection terminal 10, the processing for inputting and outputting
sound data via the third connection terminal 30 is prohibited (S6). Thus, the speakerphone 1 can
avoid the reproduction of a sound different from that of the other speakerphones 1 on the
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upstream side forming the daisy chain, based on the sound data input from the third connection
terminal 30. Also, the speakerphone 1 can not output sound data to the communication device
80 through the third connection terminal 30 separately from the other speakerphones 1 forming
the daisy chain. Therefore, the speakerphone 1 is a device that constitutes a part of the daisy
chain, but when it is determined that the device is not the most upstream device, the input and
output of sound data via the third connection terminal 30 is performed. It can be prohibited. On
the other hand, when the other speakerphone 1 is connected to the second connection terminal
20 and the other speakerphone 1 is not connected to the first connection terminal 10 as in the
speakerphones 2, 5, 7 and 8, the uppermost stream It is assumed that the device is Even if
another speakerphone 1 is connected to the second connection terminal 20, the speakerphone 1
sounds through the third connection terminal 30 if the other speakerphone 1 is not connected to
the first connection terminal 10. It does not prohibit the data from being input to or output from
the communication device 80. When the speakerphone 1 is the uppermost stream device in the
daisy chain, audio data can be input to and output from the communication device 80 through
the third connection terminal 30. As described above, the speakerphone 1 outputs sound data to
the communication device 80 through the third connection terminal 30 as compared with the
case where input and output of sound data are individually permitted in the speakerphone 1
configuring the daisy chain. Control of the
[0045]
In particular, in the audio conference system 100, it is preferable that the same sound is
reproduced on each of the daisy-chained speakerphones 1 based on the same sound data. In
addition, it is preferable that sound data representing sounds collected from each of the daisychained speakerphones 1 be acquired and transmitted to another communication device 80. In
the audio conference system 100 of the above embodiment, the same sound is reproduced based
on the same sound data in each of the daisy-chained speakerphones 1. The sound data generated
by each of the daisy-chained speakerphones 1 is output to the other speakerphone 1 on the
upstream side, and is finally synthesized into one sound data by the synthesizing circuit 51 or 53.
The speakerphone 1 controls the switches 64 and 65 to control the switches 64 and 65 via the
third connection terminal 30 when it is determined that the speakerphone 1 itself is a part of the
daisy chain. Sound data can be input / output. When the speakerphone 1 is connected in a daisy
chain, the speakerphone 1 outputs the sound data generated by itself to the other speakerphone
1 on the upstream side, and the sound data output from the plurality of speakerphones 1 is
combined into one data, It can be sent to another communication device 80. Therefore, the
speakerphone 1 can avoid the situation where sound data is not transmitted to another
communication device 80 for a part of the plurality of speakerphones 1 connected in a daisy
chain. The speakerphone 1 can prevent the plurality of daisy-chained speakerphones 1 from
individually transmitting sound data to other communication devices 80 of the audio conference
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system 100.
[0046]
The speakerphone 1 does not output sound from the speaker 46 when the second device is a
sound output device. The speakerphone 1 can save the trouble of the user manually switching
whether to output the sound by the speaker 46 according to the second device. When the first
device is a portable terminal, the speakerphone 1 can make the setting of the gain of the
combining circuit 51 smaller than when it is determined that the first device is another
speakerphone (S2) : YES, S4). As a result, even when the sound data output from the speaker
phone 1 is reproduced by the mobile phone, the speaker phone 1 can avoid the situation where
the volume of the sound is too large.
[0047]
The speakerphone 1 can detect whether the first device is another speakerphone 1 or a portable
terminal based on the first voltage and the detection result of the insertion / extraction detection
unit 11. Therefore, the speakerphone 1 can automatically execute processing according to the
type of the first device.
[0048]
The speaker phone 1 has a relatively simple structure of a reference power supply 47, a pull-up
resistor 48 and a capacitor 49, and based on the second voltage, when nothing is connected to
the second connection terminal 20, the sound output device is connected. It is possible to
distinguish between the case where the speakerphone 1 has been connected and the case where
another speakerphone 1 is connected. Therefore, the speakerphone 1 can automatically execute
processing according to the type of the second device.
[0049]
The sound data processing apparatus of the present invention is not limited to the speakerphone
1 of the above-described embodiment, and various changes may be made without departing from
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the scope of the present invention. For example, the following modifications (A) to (C) may be
added as appropriate.
[0050]
(A) The configuration of the speakerphone 1 may be changed as appropriate. For example, each
of the insertion / removal detection unit 11, the reference power supply 47, the pull-up resistor
48, and the capacitor 49 may be omitted as necessary. Each of the synthesis circuits 51 to 53
may be omitted as necessary. Part or all of the functions of each of the synthesis circuits 51 to
53 may be realized by the CPU 41. Each of the variable gain amplifiers 54 to 56 may be omitted
as needed. Some or all of the functions of each of the variable gain amplifiers 54 to 56 may be
realized by the CPU 41. The sound data processing apparatus is not limited to the speakerphone
1 and may be an apparatus without a microphone. The configurations of the first connection
terminal, the second connection terminal, and the third connection terminal may be changed as
appropriate. For example, the third connection terminal is not limited to the terminal of the USB
standard, and may be a terminal of another standard.
[0051]
(B) The program including the command for executing the main process of FIG. 3 and various
setting values may be stored in the storage device provided in the speakerphone 1 until the
speakerphone 1 executes the program. Therefore, each of the method of acquiring the program
and setting value, the acquisition path, and the device storing the program may be changed as
appropriate. The program and setting value which the processor with which the speakerphone 1
is equipped may be received from another apparatus via a cable or wireless communication, and
may be stored in a storage device such as a flash memory. Other devices include, for example, a
PC and a server connected via a network.
[0052]
(C) Each step of the main processing of FIG. 3 is not limited to the example executed by the CPU
41, and part or all may be executed by another electronic device (for example, an ASIC). In
addition, each step of the process may be distributed and processed by a plurality of electronic
devices (for example, a plurality of CPUs). In addition, each step of the main process of the above
embodiment can be changed in order, omitted, and added as needed. Furthermore, based on an
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21
instruction from the CPU 41 of the speakerphone 1, an operating system (OS) or the like
operating on the speakerphone 1 performs a part or all of the actual processing, and the
functions of the above embodiment are performed by the processing. Is also included within the
scope of the present invention. For example, in the main processing executed by the
speakerphone 1, the following modification may be added as appropriate.
[0053]
(C-1) The first voltage is different between the case where the first device is the speaker phone 1,
the case where the first device is a portable terminal, and the case where an external device is
not connected to the first connection terminal 10 In this case, the insertion and removal
detection unit 11 may be omitted. In this case, for example, the process of S1 is omitted, and
using two threshold values for the first voltage, the first device is the speaker phone 1, the first
device is the portable terminal, and the first connection terminal 10 It may be determined that
the external device is not connected to
[0054]
(C-2) In the case of automatically adjusting the volume of sound data in the portable terminal, the
processes of S4 and S8 may be omitted.
[0055]
(C-3) In S3, S6 and S7, switching of permission / prohibition of input / output of sound data
through the third connection terminal 30 is mechanically performed using the switches 64 and
65, and the CPU 41 You may control permission and prohibition of input / output of sound data
through the connection terminal 30.
Similarly, in S10, S12 and S14, switching of permission and prohibition of reproduction of sound
data by the speaker 46 is performed mechanically using the switch 63, and even if the CPU 41
switches the presence or absence of output of sound data to the speaker 46 Good.
[0056]
DESCRIPTION OF SYMBOLS 1 speaker phone 10 1st connection terminal 11 insertion /
extraction detection part 12 1st output part 13 input part 20 2nd connection terminal 21 input /
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output part 22 2nd output part 30 3rd connection terminal 41 CPU 42 ROM 43 RAM 47
reference power supply 48 pull Up resistance 49 capacitor 52, 53 combining circuit 54 variable
gain amplifier 61, 62, 63, 64, 65 switch
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