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JP2008022190

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DESCRIPTION JP2008022190
PROBLEM TO BE SOLVED: To provide a wireless microphone system which eliminates the
friction noise of a cable between a microphone and a transmitter and in which the operation of
the user is not restricted by the cable. SOLUTION: A microphone 1 for converting an audio signal
converted from an incoming sound wave into a first wireless signal corresponding to a first
wireless communication method and transmitting the same, and a first wireless signal
transmitted from the microphone 1 A transmitter 2 for receiving, converting to a second radio
signal corresponding to a second radio communication scheme and transmitting, and a receiver 3
for receiving a second radio signal transmitted from the transmitter 2 A BT (Bluetooth)
transmission / reception unit 12 for transmitting a first wireless signal to the microphone 1 is
built in, and the transmitter 2 and the receiver 3 mutually transmit and receive wireless signals
corresponding to the first wireless communication system. A possible BT transceiver unit 24, 34
is incorporated, and the BT transceiver unit 24 of the transmitter 2 is configured to also receive
the first radio signal transmitted from the microphone 1. [Selected figure] Figure 1
ワイヤレスマイクロホンシステム
[0001]
The present invention relates to wireless microphone systems.
[0002]
A conventional wireless microphone system is configured of a wireless microphone and a
receiver (see, for example, Patent Document 1).
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[0003]
In this case, the wireless microphone includes a microphone unit that converts sound waves into
audio signals, and a transmitter unit that transmits to the receiver a wireless signal obtained by
performing predetermined transmission processing such as modulation on the audio signals
generated by the microphones. And have.
The receiver receives a radio signal transmitted from the transmitter unit of the wireless
microphone, performs predetermined reception processing such as demodulation on the radio
signal, and outputs the radio signal to the speaker.
Thus, the sound is reproduced and output from the speaker. JP 2003-92537 A
[0004]
In the wireless microphone as described above, the microphone unit and the transmitter unit are
separated, and the microphone unit is, for example, a tie pin type attached to a tie or an upper
coat or a headset type microphone attachable to the head; If the microphone comprises a
transmitter configured to be put in the pocket of the user's clothes or pants or clipped to the belt
of the pants, the microphone and the transmitter are connected by a cable. Thereby, the user of
the microphone can use both hands freely while moving.
[0005]
However, in the configuration in which the microphone and the transmitter are connected by the
cable, when the sound when the cable and the human body or clothes rub against each other
(hereinafter referred to as "cable friction sound") is input to the microphone, unnecessary sound
is generated. Is output from the speaker, which is not preferable. For example, when the cable
friction sound is output together with the sound output from the speaker, not only it becomes
difficult to hear the necessary sound, but also when the user is a performer, the cable friction
sound is output from the speaker In some cases, the performance of the performance is
adversely affected, which is very inconvenient. In addition, when the user of the microphone
performs a moving performance, the cable connecting the microphone and the transmitter may
restrict the operation and interfere with the performance.
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[0006]
The present invention has been made to solve the problems as described above, and aims to
provide a wireless microphone system in which the cable friction noise is eliminated and the
user's operation is not restricted by the cable. .
[0007]
In order to solve the above problems, a wireless microphone system according to the present
invention comprises: a microphone for converting an audio signal converted from an incoming
sound wave into a first wireless signal corresponding to a first wireless communication method;
A transmitter that receives the first wireless signal transmitted from a microphone, converts the
signal into a second wireless signal corresponding to a second wireless communication scheme
different from the first wireless communication scheme, and transmits the transmitter. And a
receiver for receiving the second radio signal transmitted from the transmitter, wherein the
microphone incorporates a transmission circuit for transmitting the first radio signal, and each of
the transmitter and the receiver has A transmitting / receiving circuit capable of mutually
transmitting and receiving a wireless signal corresponding to the first wireless communication
method is incorporated, and the transmitting / receiving circuit incorporated in the transmitter is
incorporated in the microphone; It is configured to also receive the first wireless signal
transmitted from the transmitter circuit.
[0008]
According to this configuration, since the transmission of the audio signal between the
microphone and the transmitter is performed by wireless communication instead of the
conventional cable, when the conventional cable and the human body or clothes are rubbed The
cable friction noise that occurs is not input to the microphone, and the cable does not restrict the
operation of the user, enabling free operation.
In addition, transmission of predetermined data between the transmitter and the receiver, for
example, transmission of information on the reception channel from the receiver to the
transmitter, transmission of information on the remaining battery power of the transmitter to the
receiver Can be performed by wireless communication.
[0009]
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The first wireless communication method is a wireless communication method conforming to the
WPAN standard.
[0010]
In this case, for example, by performing transmission of predetermined data between the
transmitter and the receiver by wireless communication conforming to the WPAN standard,
communication failure due to an obstacle such as infrared communication can be avoided, for
example. Become.
[0011]
The second wireless communication method is a communication method in which the
communicable distance is longer than that of the first wireless communication method.
[0012]
The present invention has an effect that the wireless microphone system can be provided which
has the configuration described above, eliminates cable friction noise, and does not restrict the
operation of the user by the cable.
[0013]
Hereinafter, preferred embodiments of the present invention will be described with reference to
the drawings.
[0014]
FIG. 1 is a block diagram showing the configuration of a wireless microphone system according
to an embodiment of the present invention.
[0015]
The wireless microphone system comprises a microphone 1, a transmitter 2 and a receiver 3.
[0016]
The microphone 1 converts an incoming sound wave into an audio signal (analog signal) which is
an electrical signal, and further converts the analog / digital signal to generate an audio signal
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(digital signal), and an acoustoelectric converter And a Bluetooth transmitting / receiving unit
(hereinafter, referred to as BT transmitting / receiving unit ) 12 for converting an audio
signal (digital signal) generated in 11 into a wireless signal and transmitting the signal to the
transmitter 2.
The microphone 1 is, for example, a tie pin type that can be clipped to a neck of a user, a collar of
clothes, or the like, or a headset type microphone having a mounting portion for mounting on the
head of the user.
[0017]
In the transmitter 2, the remaining amount of the transmitting antenna 21, the control unit 22,
the audio signal transmission processing unit 23, the BT transmitting / receiving unit 24, and a
battery (not shown) used as a power supply of the transmitter 2 A battery remaining amount
detecting unit 25 to detect is provided.
The transmitter 2 is a small one that can be carried, for example, by putting it in the pocket of
the user's upper garment or pants, or clipping it to the belt of the pants.
[0018]
The receiver 3 includes a receiving antenna 31, a control unit 32, an audio signal reception
processing unit 33, a BT transmission / reception unit 34, and a display unit 35 formed of a
liquid crystal display or the like.
The receiver 3 is a semi-fixed type or fixed type installed at a predetermined place.
[0019]
The BT transceivers 12, 24, 34 provided in each of the microphone 1, the transmitter 2 and the
receiver 3 are Bluetooth ("Bluetooth") which is one of the standards of WPAN (Wireless Personal
Area Network). In accordance with the wireless communication standard (IEEE 802.15.1) called
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registered trademark ), for example, to perform wireless communication within about 10 m
using wireless signals of 2.4 GHz band frequency between each other Transmitter and receiver.
Such a transmission / reception unit can be configured, for example, using commercially
available small and inexpensive hardware.
It should be noted that instead of the BT transmitting / receiving units 12, 24 and 34 performing
wireless communication in compliance with the Bluetooth standard, other WPAN standards, for
example, the UWB standard (IEEE 802.15.3a) or the ZigBee standard (IEEE 802.15.4), etc. A
transmission / reception unit may be provided to perform wireless communication in compliance
with the above.
[0020]
The operation and operation of the wireless microphone system configured as described above
will be described.
[0021]
First, pairing is performed between the transmitter 2 having the BT transmission / reception unit
24 and the microphone 1 having the BT transmission / reception unit 12.
This pairing starts a connection session between the transmitter 2 and the microphone 1 by, for
example, pressing a predetermined push button provided on each of the transmitter 2 and the
microphone 1. This is performed by inputting a pass code pre-assigned to the microphone 1 from
an operation input unit that does not operate.
As a result, after that, wireless communication such as data can be performed between the
microphone 1 and the transmitter 2 via the BT transmission / reception units 12 and 24.
[0022]
Similarly, pairing is performed between the transmitter 2 having the BT transceiver 24 and the
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receiver 3 having the BT transceiver 34.
This pairing starts a connection session between the transmitter 2 and the receiver 3 by, for
example, pressing a predetermined push button provided on each of the transmitter 2 and the
receiver 3, and further, for example, the transmitter 2 This is performed by inputting a pass code
pre-assigned to the receiver 3 from an operation input unit (not shown) of FIG.
As a result, after that, wireless communication of data and the like becomes possible between the
transmitter 2 and the receiver 3 via the BT transmission / reception units 24 and 34.
[0023]
In addition, when pairing between the transmitter 2 and the receiver 3 is completed, the receiver
3 controls the audio signal reception processing unit 33, for example, for the reception channel
(reception frequency) information set in advance under the control of the control unit 32. It
transmits from the BT transmission / reception unit 34 to the transmitter 2. In the transmitter 2,
the BT transmission / reception unit 24 receives the reception channel information, and the
control unit 22 sets the transmission channel (transmission frequency) in the audio signal
transmission processing unit 23 in accordance with the reception channel information. For
example, one of 30 channels obtained by dividing the 806.125 to 809.750 MHz into 0.125 MHz
is set as the reception channel and the transmission channel.
[0024]
In addition, the process of pairing with the transmitter 2 and the microphone 1 and the process
of pairing with the transmitter 2 and the receiver 3 may be performed first.
[0025]
As described above, the pairing and transmission / reception channels are set.
Thereafter, the sound wave arriving at the microphone 1 is converted into an audio signal by the
acoustoelectric converter 11, and further converted into a radio signal (first radio signal) by the
BT transceiver 12 and transmitted. The radio signal transmitted from the BT transmission /
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reception unit 12 is received by the BT transmission / reception unit 24 of the transmitter 2. The
radio signal is input from the BT transmission / reception unit 24 to the audio signal
transmission processing unit 23, and the audio signal transmission processing unit 23 performs
necessary signal processing such as amplification and modulation, and then the radio signal
(from the transmission antenna 21 ( Transmitted as a second radio signal).
[0026]
The radio signal transmitted from the transmission antenna 21 of the transmitter 2 is received by
the reception antenna 31 of the receiver 3 and input to the audio signal reception processing
unit 33. The audio signal input to the audio signal reception processing unit 33 is subjected to
processing such as high frequency amplification, frequency conversion, intermediate frequency
amplification, detection (demodulation), low frequency amplification, etc., and an external
speaker (output speaker) (Not shown).
[0027]
Further, the transmitter 2 is provided with, for example, a volume adjustment volume (not
shown) for adjusting the volume of a speaker connected to the output terminal OUT of the
receiver 3. By operating the volume adjustment volume, the control unit 22 transmits a volume
control signal from the BT transmission / reception unit 24 to the receiver 3 according to the
operation. In the receiver 3, the BT transmission / reception unit 34 receives a volume control
signal (radio signal), and the control unit 32 adjusts the gain of the amplifier in the audio signal
reception processing unit 33 based on the volume control signal, The volume of the sound output
from the speaker connected to the output terminal OUT is controlled.
[0028]
In the transmitter 2, the control unit 22 transmits the battery remaining amount data detected by
the battery remaining amount detecting unit 25 from the BT transmitting / receiving unit 24 to
the receiver 3 at predetermined time intervals. In the receiver 3, the BT transmission / reception
unit 34 receives the battery remaining amount data (wireless signal), and the control unit 32
causes the display unit 35 to display the battery remaining amount of the transmitter 2 based on
the battery remaining amount data. The display method of the remaining battery amount may be
any display method. For example, the display may be divided into five steps or the like by a
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numerical value or a bar graph.
[0029]
The transmitter 2 is further provided with a gain adjustment volume (not shown) for adjusting
the gain of the amplifier in the audio signal transmission processing unit 23. By operating the
gain adjustment volume, the control unit 22 adjusts the gain of the amplifier in the audio signal
transmission processing unit 23 according to the operation.
[0030]
Note that the wireless communication method (second wireless communication method)
performed between the transmitter 2 and the receiver 3 via the transmitting antenna 21 and the
receiving antenna 31 is wireless communication performed by the BT transceivers 24 and 34.
This is a method used in a normal wireless microphone system, which has a longer
communicable distance and consumes more power than the method of (1st wireless
communication method). Therefore, when the sound picked up by the microphone 1 is amplified
by the speaker, it can be used even if the distance between the transmitter 2 and the receiver 3 is
long. On the other hand, when performing wireless communication by the BT transmission /
reception units 24 and 34, the transmitter 2 and the receiver 3 are used in a close state.
[0031]
According to the present embodiment, the BT transmitter and receiver 12 and 24 are provided in
the microphone 1 and the transmitter 2, and the transmission of the audio signal between the
microphone 1 and the transmitter 2 is replaced with the conventional cable by wireless
communication. As this is done, the cable friction noise generated when the conventional cable
rubs against the human body or clothes is not input to the microphone, and the cable does not
restrict the operation of the user, which is free. It becomes possible to operate.
[0032]
Furthermore, by performing wireless communication between the transmitter 2 and the receiver
3 via the BT transceivers 24 and 34 respectively provided, communication failure due to an
obstacle such as infrared communication is avoided, for example. Becomes possible.
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[0033]
In addition, a BT transmission / reception unit similar to the BT transmission / reception unit 24
of the transmitter 2 may be provided, and a remote controller (not shown) capable of controlling
the transmitter 2 and the receiver 3 may be provided.
In this case, for example, while pairing is performed between the remote controller and the
transmitter 2, pairing is performed between the remote controller and the receiver 3.
As a result, wireless communication such as data can be performed between the remote
controller and the transmitter 2 and between the remote controller and the receiver 3 via the
respective BT transceivers. In this case, the transmission / reception channel can be changed by
operating the remote controller. For example, when the administrator carries the remote
controller and interference occurs while the user is using the microphone 1, the administrator
operates the remote controller to request the receiver 3 to transmit free channel information.
Send. Corresponding to this, the receiver 3 transmits free channel information to the remote
controller. The administrator looks at the available channel information sent to the remote
controller and performs an operation to select one available channel as the channel to be
changed. Thereby, the information of the channel to be changed is transmitted to the transmitter
2 and the receiver 3, and the transmitter 2 and the receiver 3 set the channel to be changed as
the transmission channel and the reception channel, respectively. As described above, even when
the microphone 1 is in use, the transmission channel and the reception channel can be rapidly
changed to avoid interference and the like. In addition, the remote controller may have a function
of instructing the receiver 3 to adjust the volume of the speaker connected to the output terminal
OUT of the receiver 3 by operating the remote controller, or the transmitter A function of
instructing the transmitter 2 to adjust the gain of the amplifier in the second audio signal
transmission processing unit 23 may be provided.
[0034]
As described above, each device including the microphone 1, the transmitter 2 and the receiver 3
and further the above-mentioned remote controller is wirelessly compliant with the WPAN
standard such as the above-mentioned Bluetooth, UWB or ZigBee. By providing a transmission /
reception unit for performing communication, transmission / reception of various information,
control signals, and the like can be performed between the devices. Note that the volume control
signal transmitted from the transmitter 2 to the receiver 3 described above, the battery residual
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amount data, and the like are an example, and transmission and reception of various types of
information, control signals, and the like can be performed between the devices. . Further, by
providing such a transmitting / receiving unit in the microphone 1 and the transmitter 2, the
conventional cable connection is eliminated and the microphone 1 and the transmitter 2 are
separated, and transmission of an audio signal from the microphone 1 to the transmitter 2 is
realized. It can be performed by wireless communication. Further, by using, for example,
commercially available small and inexpensive hardware as the above-described transmission /
reception unit, the size and cost of each device can be reduced, and the cost of the entire wireless
microphone system can be reduced. Can also be implemented.
[0035]
The wireless microphone system according to the present invention is useful as a wireless
microphone system or the like that can cope with intense operation of the user of the
microphone.
[0036]
It is a block diagram showing composition of a wireless microphone system of an embodiment of
the invention.
Explanation of sign
[0037]
Reference Signs List 1 microphone 2 transmitter 3 receiver 11 acoustic-electrical conversion unit
12 Bluetooth (BT) transmission / reception unit 21 transmission antenna 22 control unit 23
audio signal transmission processing unit 24 Bluetooth (BT) transmission / reception unit 25
battery remaining amount detection unit 31 reception antenna 32 control Unit 33 Audio signal
reception processing unit 34 Bluetooth (BT) transmission / reception unit 35 Display unit
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