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JP2016163054

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DESCRIPTION JP2016163054
Abstract: The present invention provides a microphone connecting device capable of sharing a
microphone of a first form provided with an LED and a microphone of a second form not
provided with an LED with a small number of pins. SOLUTION: In a microphone amplifier unit 11
to which the microphone 1 of the first embodiment or the microphone 2 of the second
embodiment is connected, the connection state of the microphone of the first embodiment or the
second embodiment, the specific terminal of the connector A microphone detection means is
provided which detects based on the potential information supplied to the pin. In the microphone
amplifier unit 11, appropriate circuit settings corresponding to the functions of the respective
microphones are made based on the information obtained by the microphone detection means.
[Selected figure] Figure 3
Microphone connection device
[0001]
The present invention realizes lighting control of the light emitter in the microphone provided
with the light emitter, for example, by remote control, and can share the balanced output method
of the signal even with respect to the existing microphone without the light emitter. A
microphone connection device.
[0002]
For example, a gooseneck microphone is provided as a conference microphone installed on the
floor of a conference hall or on the desktop of a conference attendee.
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This gooseneck microphone has a long neck stand arm made of a flexible pipe which can be
easily adjusted in angle and height. A microphone unit case accommodating a microphone unit is
attached to the tip of the stand arm.
[0003]
In general, a small and lightweight condenser microphone is used for the goose neck
microphone. In order to operate the impedance converter of the condenser microphone, a
phantom power feeding system is employed which can obtain operating power from the
microphone amplifier unit side using the signal line of the microphone.
[0004]
In the microphone installed in the above-mentioned meeting place etc., in order to make progress
of a meeting smoothly, it is called an illuminant (hereinafter, LED) to the main body side of the
microphone. There is also provided a gooseneck microphone for lighting the LED by remote
control by an operator, for example. Such gooseneck-type microphones notify the speaker that
the audio signal can be captured and turned on by selective control of the audio signal.
[0005]
By the way, the conventional condenser microphone without the above-mentioned LED generally
has a 3-pin type output connector. A microphone cable is detachably connected to this output
connector. As the output connector, a connector defined by EIAJ RC-5236 "Ratch lock type round
connector for audio equipment" is used. This connector has a first pin for grounding, a second
pin used as the hot side of the signal, and a third pin used as the cold side of the signal. Such a 3pin type output connector is disclosed in Patent Document 1.
[0006]
On the other hand, in the case where the above-described LED is provided on the side of the
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microphone body, a microphone having a configuration in which a pin for LED control is added
to the above-described pin of the output connector has been proposed. Such a conventional
microphone can perform lighting control of the LED provided in the microphone body from the
microphone amplifier unit side by remote control.
[0007]
Also, a condenser microphone provided with an LED connectable by EIAJ RC-5236 as well as a
condenser microphone not provided with the LED has been proposed. However, the condenser
microphone provided with the LED is configured such that the voltage for driving the LED is
applied to the entire housing of the microphone. Since the housing of this microphone is
insulated by paint, the user does not get an electric shock during normal use. However, in the
case where a problem such as peeling of the paint occurs due to repeated use, the microphone of
this configuration may cause an electric shock to the user.
[0008]
JP 2005-94575 A
[0009]
As described above, the microphones provided with the LEDs on the side of the microphone body
and the microphones not provided with the LEDs usually have different numbers of pins in the
output connector as described above.
Therefore, the receiving port of the output connector is also different, and sharing is impossible.
That is, in general, the former condenser microphone provided with the LED on the microphone
body side and the latter condenser microphone not provided with the LED can not be used
together.
[0010]
In addition, even if the pin count of the output connector of the microphone equipped with the
LED is the same as the microphone not equipped with the LED, the voltage and current for
driving the LED are applied to the housing of the microphone, so safety is added There was a
problem called.
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[0011]
Therefore, in the case where the former microphone with the LED has a defect, for example, it is
an important issue to have versatility so that the microphone without the latter LED can be used
instead.
Moreover, even if it is a microphone provided with LED, although it is the same pin number as
the microphone which does not have LED, the connection structure of the microphone which can
be utilized safely, or the connection method of a microphone are desired.
[0012]
The present invention has been made to solve the above-mentioned problems, and the output
connectors of the former and the latter condenser microphones are shared with a small number
of pins, and the output signal of the condenser microphone is balanced and used while using a
phantom power source. It is something that is going to be possible. Then, on the microphone
amplifier unit side receiving the output signal of the microphone, the former and the latter
condenser microphones are identified, and for the microphone provided with the former LED, the
mode is set to enable the lighting control of the LED It is an object of the present invention to
provide a microphone connection device capable of
[0013]
A microphone connection device according to the present invention, which has been made to
solve the above-mentioned problems, comprises: a first form of microphone having a light
emitter mounted thereon; a connector to which a second form microphone having no light
emitter mounted is connectable; Microphone detection means for detecting which of the
microphone of the first form or the microphone of the second form has been connected and
outputting a detection signal; a lighting circuit for lighting the light emitter mounted on the
microphone of the first form; And control means for controlling the lighting circuit based on the
detection signal.
[0014]
In this case, in a preferred embodiment, the circuit further includes a short circuit, and the
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control means sets the lighting circuit to be operable according to the input of the detection
signal indicating the connection of the microphone of the first form, The short circuit is
configured to be operatively set in response to an input of a detection signal indicating
connection of the microphone of the second form.
[0015]
The microphone detection means is configured to output the detection signal based on potential
information appearing on a specific terminal pin of the connector.
Further, the lighting circuit is configured to turn on the light emitter by connecting the specific
terminal pin to ground and to turn off the light emitter by opening the ground connection of the
specific terminal pin. .
[0016]
In a preferred embodiment, the apparatus further comprises a feed circuit for supplying phantom
power, and light emission drive power is supplied from the feed circuit to the lighting circuit.
The connector further includes a hot signal line and a cold signal line, and the audio signal from
the microphone is balanced and output, and the power from the feed circuit is equally divided to
the hot signal line and the cold signal line. And a phantom feeding circuit to be sent to the
microphone. In addition, preferably, the connector is provided with three terminal pins.
[0017]
Further, in a preferred embodiment of the microphone connecting device according to the
present invention, the microphone and the microphone amplifier unit receiving the audio signal
from the microphone are connected via the connector and the microphone cable, and the feeding
circuit provided in the microphone amplifier unit A microphone connection device for supplying
DC power to the microphone side via the connector and a microphone cable, wherein the
microphone amplifier unit includes a microphone of a first form having a light emitter mounted
thereon, and a second not including the light emitter. It is possible to connect to the microphone
of the embodiment, and the connection state of the microphone of the first embodiment or the
microphone of the second embodiment can be connected to the microphone amplifier unit by the
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DC power supplied to the specific terminal pin of the connector. Microphone detection hand to
detect based on potential information The lighting circuit of the light emitter is set to be operable
by detecting the connection of the microphone of the first form by the microphone detection
means, and the connection of the microphone of the second form is detected, whereby the
identification of the connector is performed. Control means for ground connection of the
terminal pins of
[0018]
The microphone of the first embodiment used in the microphone connection device described
above operates the impedance conversion circuit from the feed circuit on the microphone
amplifier unit side to the impedance conversion circuit connected to the condenser microphone
unit and the light emitter. A current and a light emission drive current of the light emitter are
provided.
[0019]
The microphone connection device of the above configuration detects either the connection of
the microphone of the first form having the light emitter mounted thereon or the microphone of
the second form not mounted the light emitter based on the potential information of a specific
terminal pin of the connector Microphone detection means.
When the connection of the microphone of the first embodiment is detected, the lighting control
circuit of the light emitter is set to be operable, and the connection of the microphone of the
second embodiment is detected, whereby the specific terminal pin of the connector is detected.
An operation of connecting to ground is performed.
As a result, it is possible to provide a microphone connection device capable of performing
appropriate circuit settings corresponding to the functions of the microphones of the first and
second embodiments described above.
[0020]
It is the block diagram which showed the microphone of the 1st form used for the microphone
connection apparatus concerning this invention. It is a block diagram showing the microphone of
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the 2nd form similarly. It is the circuit block diagram which showed the structure of the
microphone amplifier unit as an example of a microphone connection device similarly. It is the
circuit block diagram which showed the specific example of the microphone of the 1st form
shown in FIG. It is the circuit block diagram which showed the specific example of the
microphone of the 2nd form shown in FIG. It is a flowchart which shows operation ¦ movement
of the control means mounted in the microphone amplifier unit as an example of a microphone
connection apparatus.
[0021]
Hereinafter, a microphone connection device according to the present invention will be described
based on an embodiment shown in the drawings. First, FIG. 1 is a block diagram showing a
microphone of a first embodiment in which an LED is mounted as a light emitter. A condenser
microphone unit 4 and a circuit component 5 are accommodated in the microphone unit case 3
in the microphone 1 of the first embodiment. The circuit configuration unit 5 accommodates an
impedance converter of the condenser microphone unit 4 and a power supply circuit described
later. Further, in the microphone unit case 3, for example, an LED is disposed as the light emitter
D1. The anode of the LED is connected to the power supply circuit in the circuit configuration
unit 5, and the cathode is connected to the first pin P 1 of the output connector 6.
[0022]
The microphone 1 shown in FIG. 1 constitutes a gooseneck microphone. The output connector 6
is attached to the proximal end of a stand arm (not shown) that constitutes a gooseneck
microphone. The connection line between the microphone unit case 3 attached to the tip of the
stand arm and the output connector 6 is accommodated in the stand arm. Further, the
microphone unit case 3 is connected to the frame ground terminal FL of the output connector 6
through the metal stand arm.
[0023]
In the microphone 1 of the first embodiment shown in FIG. 1, the second pin P2 of the output
connector 6 is used as the hot side of the signal, and the third pin P3 is used as the cold side of
the signal. Furthermore, the ground line of the signal is connected to the frame ground terminal
FL of the output connector 6, and the signal is configured to be balanced output. That is,
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although the 3-pin type connector is used in the output connector 6 of the microphone 1 of the
first embodiment, the existing connection fitting for connecting the first pin P1 and the frame
ground terminal FL is removed and electrically It is separated.
[0024]
FIG. 4 shows a circuit configuration of the microphone 1 of the first embodiment shown in FIG.
The microphone unit 4 provided in the microphone 1 constitutes an electret condenser
microphone unit in which an electret layer is provided on either a diaphragm or a fixed pole
facing the microphone unit 4. One fixed pole is connected to the gate of the FET (Q1) functioning
as an impedance converter, and the other diaphragm is connected to the ground line of the
microphone 1. A DC operating voltage is supplied to the drain of the FET (Q1) from a constant
voltage circuit described later, and a source resistor R1 is connected to the source. That is, the
FET (Q1) constitutes a source follower circuit.
[0025]
A coupling capacitor C1 is connected to the source of the FET (Q1). The signal from the
impedance converted capacitor microphone unit 4 is extracted via this coupling capacitor C1.
This signal is supplied to the noninverting input terminal of the first operational amplifier OP1.
The output terminal of the first operational amplifier OP1 is connected to the input resistor R2 of
the second operational amplifier OP2, and the other end of the input resistor R2 is connected to
the inverting input terminal of the second operational amplifier OP2. The noninverting input
terminal of the second operational amplifier OP2 is connected to ground via a capacitor C2.
Further, a feedback resistor R3 is connected between the inverting input terminal and the output
terminal of the second operational amplifier OP2. By setting the values of the input resistor R2
and the feedback resistor R3 equal, the second operational amplifier OP2 constitutes an inverting
amplifier with a voltage amplification factor of -1.
[0026]
Therefore, the output of the first operational amplifier OP1 and the output of the second
operational amplifier OP2 are generated based on the signal obtained by the condenser
microphone unit 4, and are in a reverse phase relation (balanced output state). The balanced
output signals are supplied to the bases of the transistors Q2 and Q3 through coupling capacitors
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C3 and C4, respectively.
[0027]
The transistor Q2 constitutes a first emitter follower circuit including a bias setting resistor R4.
The output of this first emitter follower circuit is supplied to the second pin P2 of the output
connector 6 as the hot side output of the signal. The transistor Q3 constitutes a second emitter
follower circuit including a bias setting resistor R5. The output of this second emitter follower
circuit is supplied to the third pin P3 of the output connector 6 as a cold side output of the
signal.
[0028]
In addition, DC power from a feeding circuit provided in the microphone amplifier unit 11
described later is connected to the hot side and the cold side via the second pin P2 and the third
pin P3 of the output connector 6 for balanced output of signals. It is equally divided and sent to
the microphone side. This constitutes a phantom feeding circuit.
[0029]
The direct current from the phantom feeding circuit is supplied to the commonly connected
collectors of the transistors Q2 and Q3 constituting the first and second emitter follower circuits.
A constant current element Ic is connected to the commonly connected collectors. A constant
voltage element Z1 and a capacitor C5 are connected in parallel between the constant current
element Ic and the ground line. The constant voltage element Z1 and the capacitor C5 constitute
a power supply circuit (constant voltage circuit) 7, and supply a drive voltage to the FET (Q1) and
the first and second operational amplifiers OP1 and OP2.
[0030]
On the other hand, the microphone of the first form shown in FIG. 4 is mounted with the LED
(light emitter D1) as shown in FIG. The anode of the LED (D 1) is connected to the power supply
circuit 7 described above, and the cathode thereof is connected to the first pin P 1 of the output
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connector 6.
[0031]
As shown in FIG. 4, a connection between the well-known balanced shield cable and the frame
ground terminal FL is used between the output connector 6 of the microphone 1 and the
connector 12 provided in the microphone amplifier unit 11. It is connected. The connection
between the output connector 6 and the connector 12 as described above balances and outputs
the signal from the microphone 1 side to the microphone amplifier unit 11 from the microphone
1 side, and directs the microphone 1 to the microphone 1 from the microphone amplifier unit 11
side. A phantom feeding circuit to be described later that transmits power is configured.
[0032]
Next, FIG. 2 is a block diagram showing the microphone of the second embodiment. Like the
microphone of the first embodiment, the microphone 2 of the second embodiment also
constitutes a gooseneck microphone. Further, compared to the microphone 1 of the first
embodiment, the microphone 2 of the second embodiment does not have the light emitter D1
(LED), and the other main configuration is the same as that of the microphone 1 of the first
embodiment. Therefore, parts performing the same function are indicated by the same reference
numerals, and individual descriptions are omitted.
[0033]
The microphone 2 of the second embodiment also uses a 3-pin type output connector 6.
However, the frame ground terminal FL and the first pin P1 are electrically connected by the
existing connection fitting.
[0034]
FIG. 5 shows a circuit configuration of the microphone 2 of the second embodiment shown in
FIG. The main part of the circuit configuration shown in FIG. 5 is the same as the example shown
in FIG. Therefore, parts performing the same function are indicated by the same reference
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numerals, and individual descriptions are omitted. As shown in FIG. 5, in the microphone 2 of the
second embodiment, the first pin P1 of the output connector 6 functions as a ground line of the
signal. Then, the balanced output signal from the microphone 2 is output to the microphone
amplifier unit 11 as the hot side and the cold side via the second pin P2 and the third pin P3 of
the output connector 6, respectively. Also, from the microphone amplifier unit 11 side, equally
divided DC power is sent to the power supply circuit 7 of the microphone 2 by using the second
pin P2 and the third pin P3 of the output connector 6 as described later. Thus, a phantom
feeding circuit is configured.
[0035]
FIG. 3 shows a configuration of a microphone connection device, for example, a microphone
amplifier unit 11, to which the first form microphone 1 or the second form microphone 2
described above is appropriately connected. The microphone amplifier unit 11 is also provided
with a 3-pin type connector 12. The frame ground terminal FL of the connector 12 is connected
to the metal case of the microphone amplifier unit 11 and also functions as a signal ground line.
[0036]
The second and third pins P2 and P3 of the connector 12 are respectively connected to the noninverted input terminal and the inverted input terminal of the operational amplifier OP3
constituting the differential amplifier circuit through the DC cut capacitors C11 and C12.
According to this configuration, the balanced output signal from the microphone of the first or
second form is subjected to arithmetic processing (for example, subtraction processing) in the
operational amplifier OP3 and provided to the output terminal Out. Further, the microphone
amplifier unit 11 is provided with, for example, a 48 V DC power supply Eo functioning as a
phantom power supply. The DC power source Eo is sent to each of the terminal pins P2 and P3
via two 6.8 KΩ resistors R11 and R12. That is, the DC power supply Eo and the resistors R11
and R12 constitute a feed circuit.
[0037]
The first pin P1 of the connector 12 is connected to the terminal T1 via the resistor R13. A
constant voltage diode Z2 having a Zener voltage characteristic of 3.3 V, for example, is
connected between the terminal T1 and the ground. The terminal T1 is a form of the microphone
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connected to the microphone amplifier unit 11 according to the case where the positive potential
"H" is generated as the detection signal at the terminal T1 and the case where the positive
potential "H" is not generated (the first embodiment described above Or the microphone
detection means which detects a microphone of a 2nd form is comprised.
[0038]
The source of the P-type MOSFET (Q11) is connected to the first pin P1 of the connector 12, and
the collector of the npn-type transistor Q12 is connected to the drain of the MOSFET (Q11). The
emitter of the transistor Q12 is connected to the ground, and the base is connected to the
terminal T2. Therefore, whether or not the transistor Q12 performs a switching operation to
connect the drain of the P-type MOSFET (Q11) to the ground according to whether or not the
positive potential "H" is inputted to the terminal T2 and "L". Control whether or not.
[0039]
Furthermore, between the first pin P1 and the ground, two bias resistors and the collector and
emitter of the npn transistor Q13 are connected. The connection midpoint of the two bias
resistors is connected to the gate of the MOSFET (Q11). The base of the transistor Q13 is
connected to the terminal T3. Therefore, when the positive potential "H" is applied to the
terminal T3, it is possible to apply a gate bias which can set the MOSFET (Q11) in the ON state.
[0040]
Further, the source of the P-type MOSFET (Q14) is connected to the first pin P1 of the connector
12, and the drain of Q14 is grounded. The two bias resistors and the collector and emitter of the
npn transistor Q15 are connected between the first pin P1 and the ground. The connection
midpoint of the two bias resistors is connected to the gate of the MOSFET (Q14). The base of the
transistor Q15 is connected to the terminal T4. Therefore, when the positive potential "H" is
input to the terminal T4, a gate bias for turning on the MOSFET (Q14) is given.
[0041]
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The terminals T1, T2, T3 and T4 are connected to an appropriate control unit 15 which functions
as the control means described above. The control unit 15 may be provided in a connection
device of a microphone, or may be provided in another external device (for example, a mixer or
the like). The control unit uses a general configuration such as a CPU, an FPGA, or an ASIC.
[0042]
FIG. 6 shows an operation flow of detecting a form of a connecting device of a microphone, for
example, a microphone connected to the microphone amplifier unit 11, and executing
appropriate control. That is, when the microphone amplifier unit 11 is put into operation (Power
ON) by the control unit 15, the terminals T2, T3 and T4 are set to "L" as shown in step S1.
Therefore, the two MOSFETs (Q11 and Q14) are both turned off.
[0043]
In this state, as shown in step S2, the control unit 15 detects the potential of the detection signal
output to the terminal T1. When the microphone 1 of the first form shown in FIGS. 1 and 4 is
connected to the microphone amplifier unit 11, the DC power supply Eo is connected via the
power supply circuit 7 and the LED (D1) mounted thereon. The potential from V appears as "H"
at the terminal T1. When the microphone 2 of the second form shown in FIGS. 2 and 5 is
connected to the microphone amplifier unit 11, the potential appearing at the terminal T1 is the
ground potential "L".
[0044]
In step S3, when the potential "L" appears at the terminal T1, the microphone 2 of the second
embodiment is connected to the microphone amplifier unit 11. Thus, in step S4, the control unit
15 performs an operation of setting the terminal T4 to "H". Therefore, both the transistor Q15
and the MOSFET (Q14) are turned on, and the first pin P1 of the connector 12 is grounded by
the short circuit of the MOSFET (Q14). With this operation setting, the first pin P1 of the
microphone 2 of the second form shown in FIGS. 2 and 5 is connected to the ground, and the
second and third pins P2 and P3 are used for balanced signal output and transmission of
phantom power. It will be used.
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[0045]
On the other hand, when the potential "H" appears at the terminal T1 in step S3, the microphone
1 of the first embodiment is connected to the microphone amplifier unit 11. As a result, as shown
in step S5, the control unit 15 performs an operation of setting the terminal T3 to "H". Therefore,
the gate bias of the MOSFET (Q11) is added to the gate of the MOSFET (Q11) to turn on the
MOSFET (Q11), and the lighting circuit of the LED is set to be operable.
[0046]
In this state, in step S6, the control unit 15 sets the terminal T2 to "H" or "L". That is, when "H" is
input to the terminal T2, the transistor Q12 is turned on. When the transistor Q12 is turned on,
the first pin P1 of the connector 12 is grounded via the MOSFET (Q11) and the transistor Q12.
Thereby, the cathode of the LED (D1) mounted on the microphone 1 of the first embodiment is
connected to ground, and the lighting circuit of the LED (D1) makes the LED (D1) emit light.
When "L" is input to the terminal T2, the transistor Q12 is turned off. When the transistor Q12 is
turned off, the cathode of the LED (D1) is disconnected from the GND and the LED (D1) is turned
off.
[0047]
Therefore, as described at the beginning, when the gooseneck microphone of the first
embodiment provided with the LED as the light emitter D1 is used in a conference hall, the LED
can be set by setting the terminal T3 to "H". It can be turned on. After that, H or L is
input to the terminal T2 to turn on or off the LED. At this time, control of the terminal T2 may be
performed by the operator via an external input device (not shown).
[0048]
According to the embodiment described above according to the present invention described
above, the output connector of the condenser microphone 1 of the first form provided with the
LED and the condenser microphone 2 of the second form not provided with the LED can be
shared with a small number of pins. can do. That is, according to the present embodiment, the
condenser microphones of the first form or the second form can be shared without changing the
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pin arrangement of a conventional connector, for example, EIAJ RC-5236. Then, the output signal
of the condenser microphone can be balanced and output, and the phantom power can be made
available.
[0049]
Also, on the microphone connection device side that receives the output signal of the
microphone, based on the potential information from the DC power supply Eo supplied to the
specific terminal pin (first pin P1) of the connector, The connection of the condenser microphone
can be detected. As a result, on the side of the microphone amplifier unit 11, appropriate circuit
setting corresponding to each type of condenser microphone can be performed by the control
operation of the control unit 15. Therefore, it is not necessary to provide a pin for controlling the
LED as in the conventional case, and it is possible to realize a microphone connection device
which can be used safely and which solves a problem such as electric shock while having the
same number of pins as the conventional one.
[0050]
DESCRIPTION OF SYMBOLS 1 microphone of the first form 2 microphone of the second form 3
microphone unit case 4 capacitor microphone unit 5 circuit configuration part 6 connector 7
power supply circuit (constant voltage circuit) 11 microphone amplifier unit 12 connector 15
control part (control means) Q1 impedance Conversion element D1 Light emitter (LED) Eo DC
power supply (phantom power supply) P1, P2, P3 Terminal pin
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