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JP2012119939

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2012119939
The present invention provides a wireless receiver and a wireless microphone system capable of
automatically setting up a channel with less occurrence of interference. The wireless receiver
extracts an external use channel used by an external device, and extracts an interference channel
that may interfere with at least one of the external use channels used by the wireless receiver.
Then, among the reception channels, each reception channel other than the external use channel
and the interference channel is extracted as a settable channel. [Selected figure] Figure 6
Wireless receiver and wireless microphone system
[0001]
The present invention relates to a wireless receiver and a wireless microphone system including
a plurality of reception channels and receiving a transmission signal from a microphone having a
plurality of transmission channels.
[0002]
As said wireless receiver, the thing of patent document 1 is known, for example.
The wireless receiver receives signals from the plurality of microphones and reproduces the
signals of each microphone. Each microphone has a plurality of channels and transmits signals at
frequencies corresponding to the set channels. The wireless receiver is set to receive a channel
having the same frequency as the channel set in the microphone, and receives a signal from the
01-05-2019
1
same microphone. That is, when multiple microphones are used, multiple channels are used
simultaneously and in the same space.
[0003]
By the way, when using a wireless microphone system, it is necessary to select an arbitrary
channel from a plurality of channels. However, when a plurality of channels are used
simultaneously and in the same space, radio waves may influence each other to cause
interference. For this reason, channel selection needs to be set so that interference does not
occur. Specifically, in order to avoid interference between channels to be used, in order to avoid
interference with an external radio wave, a channel corresponding to the frequency of the radio
wave is excluded to set a channel.
[0004]
However, such setting is complicated to operate and is a very difficult task for those who do not
understand the technology of the wireless microphone system. Therefore, Patent Document 1
automatically detects whether there is an external signal of a frequency other than the frequency
of the channel used in the wireless receiver, excludes the channel corresponding to this external
signal, and receives the microphone and the wireless reception. Set the machine channel.
[0005]
Japanese Patent Application Laid-Open No. 10-200434
[0006]
However, as described above, interference may occur even when the microphone and the
wireless receiver are set by excluding the channel corresponding to the external signal.
The present invention has been made in view of such circumstances, and an object thereof is to
provide a wireless receiver and a wireless microphone system capable of automatically setting a
channel in which interference is less likely to occur.
01-05-2019
2
[0007]
Hereinafter, the means for achieving the above-mentioned object and the operation effect are
described. (1) The invention according to claim 1 is characterized in that, in a wireless receiver
having a plurality of reception channels and receiving a transmission signal from a microphone
having a plurality of transmission channels, the external use channel used by an external device
is extracted Abstract: Extract an interference channel that may interfere with the external use
channel, and extract the external use channel and the reception channels other than the
interference channel among the plurality of reception channels as settable channels. .
[0008]
According to the present invention, reception channels other than the external use channel and
the interference channel are settable channels that can be set by the user. Thus, the user can
easily set up a reception channel free from interference.
[0009]
(2) In the wireless receiver according to claim 1, in the wireless receiver according to claim 1, the
plurality of reception channels are divided into a plurality of groups, and each of the groups is
interfered by use in the same group. A combination of the reception channels that does not
occur, one of the plurality of groups is selected, and among the reception channels in the
selection group, the reception channels other than the external use channel and the interference
channel can be set. The point is to make
[0010]
When a plurality of reception channels other than the external use channel and the interference
channel are used, interference may occur between the used reception channels.
In this regard, according to the present invention, since the reception channels other than the
external use channel and the interference channel are settable channels in the same group
having the above configuration, interference between the set channels can be suppressed.
01-05-2019
3
[0011]
(3) According to the invention of claim 3, in the wireless receiver according to claim 2, the
number of the settable channels can be obtained for each of the groups, and the group having
the largest number is set as the settable largest group. The gist is to select and set this most
configurable group as the selected group.
[0012]
According to the present invention, the number of reception channels in which interference does
not occur is determined for each group, and the group with the largest number is selected as the
settable largest group.
Then, since the reception channels which do not interfere with each other in the settable largest
group are set as the settable channels, the number of channels which can be used by the user can
be increased.
[0013]
(4) In the wireless receiver according to the third aspect of the present invention, in the wireless
receiver according to the third aspect, an average value of signal levels of the externally used
channel is obtained for each of the groups, At this time, a group having the smallest average
value of the signal levels is extracted from the largest group that can be set, and this group is
regarded as the selected group.
[0014]
According to the present invention, when there are a plurality of settable maximum groups, an
average value of signal levels of externally used channels is determined for each group, and a
settable maximum group having the smallest average value of signal levels is taken as a selected
group. .
Then, the reception channels other than the selected group, the external use channel, and the
interference channel are set as the settable channels. Therefore, it is possible to show the user a
group that is least likely to cause interference.
01-05-2019
4
[0015]
(5) In the wireless receiver according to any one of claims 1 to 4, the invention according to
claim 5 uses two or more channels before and after including an external frequency
corresponding to the external use channel. In the range where the channels interfere with each
other, the first frequency is the frequency farthest from the external frequency in the range
where the channels interfere with each other, and the second frequency is the frequency farthest
from the external frequency as the second frequency. The present invention provides the
extraction of the reception channel having a frequency between the frequency and the second
frequency as the interference channel.
[0016]
According to the present invention, the frequencies belonging to the bands that interfere with
each other when setting the channel are considered to be interference channels and are excluded
from the settable channels, so that interference between the channels can be suppressed more
reliably. Can.
[0017]
(6) The invention according to claim 6 corresponds to the wireless receiver according to any one
of claims 1 to 5, wherein the frequency of the frequency of the externally used channel is
affected by the mutual third modulation distortion. A summary of the present invention is to
extract a channel as the interference channel.
[0018]
According to the present invention, interference occurs to the user of the wireless receiver, as
compared to a channel having a frequency affected by the mutual third-order modulation
distortion of the frequency corresponding to the externally used channel as the interference
channel. It is possible to reliably indicate a less feared receiving channel.
[0019]
(7) The invention according to claim 7 is a wireless microphone system including the wireless
receiver according to any one of claims 1 to 6 and a microphone.
[0020]
According to the present invention, since the settable channel is indicated to the wireless
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5
receiver, the user of the wireless receiver can easily set the reception channel of the wireless
receiver and the transmission channel of the microphone.
[0021]
The schematic diagram which shows the schematic structure about the wireless microphone
system of 1st Embodiment of this invention.
The front view which shows the front structure of the transmission channel setting part about
the microphone of the embodiment.
The block diagram which shows the internal structure about the microphone of the embodiment.
The block diagram which shows the internal structure about the wireless receiver of the
embodiment.
The schematic diagram which shows typically the interference zone which interferes with a
selection channel about the wireless receiver of the embodiment.
The flowchart which shows the procedure about "setting possible channel search processing"
performed in the wireless receiver of the embodiment.
The flowchart which shows the procedure about "external use channel determination processing"
performed in the wireless receiver of the embodiment. The channel map which shows the group
of each receiving channel, and a settable channel about the wireless receiver of the embodiment.
The flowchart which shows the procedure about "a settable channel search process" performed
in the wireless receiver of 2nd Embodiment of this invention. FIG. 14 is a channel map showing
groups of respective reception channels and settable channels in the wireless receiver of the
third embodiment of the present invention. FIG. The flowchart which shows the procedure about
"a settable channel search process" performed in the wireless receiver of 4th Embodiment of this
invention.
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[0022]
First Embodiment A first embodiment of the present invention will be described with reference to
FIGS. 1 to 8. As shown in FIG. 1, the wireless microphone system 1 includes a transmission
system 2 that transmits an audio signal and a reception system 3 that receives an audio signal.
[0023]
The transmission system 2 is composed of a plurality of microphones 10. The receiving system 3
mixes the signals from the wireless antenna 4, the mixer 5 for mixing the signals from the
wireless antenna 4, the wireless receiver 30 for demodulating the signals from the mixer 5, and
the wireless receiver 30. A mixer 6, an amplifier 7 for amplifying a signal from the mixer 6, and a
speaker 8 are provided.
[0024]
The microphone 10 and the receiving system 3 have a plurality of channels. Each channel is
assigned one frequency. In this embodiment, channels are set for each frequency separated by
0.125 MHz in the range of 806.125 MHz to 809.750 MHz, and 30 channels are provided (see
FIG. 8).
[0025]
The channel configuration of the transmission system 2 and the channel configuration of the
reception system 3 match, the channel of the transmission system 2 and the channel of the
reception system 3 correspond one to one, and the same frequency is assigned to the
corresponding channels. In order to receive the audio signal of the microphone 10 by the
receiving system 3, the channels used by both are set to be the same. When using multiple
microphones 10, multiple channels are used simultaneously.
[0026]
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7
The channels of the microphone 10 are divided into six groups A to F as shown in FIG. Each
group is assigned to each group so as to be a combination of channels in which interference does
not occur when using a plurality of channels in the same group. The channels assigned to each
group are numbered in ascending order of frequency. In FIG. 8, in group A, channel No. 1 (A1) of
frequency 806.750 MHz, channel No. 2 of frequency 807.500 MHz (A2), channel No. 3 of
frequency 808.250 MHz, and channel of frequency 809.000 MHz No. 4 (A4) and channel No. 5
(A5) of frequency 809.750 MHz are allocated. Therefore, each channel is identified by the
designation of the group and the designation of the channel number. The channel of the
reception system 3 is also configured the same as the channel configuration of the microphone
10.
[0027]
Hereinafter, the channel on the transmission system 2 side is referred to as “transmission
channel CHX”, and the channel on the reception system 3 side is referred to as “reception
channel CHY”. Further, the group on the transmission system 2 side is referred to as
“transmission group GRX”, and the group on the reception side is referred to as “reception
group GRY”.
[0028]
The microphone 10 is a signal processing unit that forms an audio signal based on a signal from
the head unit 11 and a set channel, and a head unit 11 that detects voice by a sensor, a
transmission channel setting unit 12 that sets a transmission channel CHX 13 and a transmitter
14 for transmitting the signal formed by the signal processor 13.
[0029]
As shown in FIG. 2, the transmission channel setting unit 12 is provided with a first transmission
setting unit 12A for setting the transmission group GRX and a second transmission setting unit
12B for setting a specific transmission channel CHX in the group. ing.
[0030]
The setting of the group is performed by rotating the first rotary switch 12C and selecting a
specific group number.
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8
The setting of the transmission channel CHX is performed by rotating the second rotary switch
12D to select a specific channel number.
[0031]
As shown in FIG. 3, the signal processing unit 13 includes an A / D conversion circuit 21 for
converting a signal from the head unit 11 into a digital signal, and an intermediate signal based
on the digital signal formed by the A / D conversion circuit 21. A signal forming unit 22 for
forming a transmission signal and an amplifier circuit 23 for amplifying the intermediate
transmission signal to form a transmission signal are provided.
[0032]
The signal forming unit 22 includes a signal processing circuit 24 which converts a digital signal
formed by the A / D conversion circuit 21 into a signal conforming to a predetermined standard,
and an FM modulation circuit 25 which FM modulates a signal from the signal processing circuit
24. And an intermediate signal formation circuit 26 that forms an intermediate transmission
signal based on the FM modulated signal and the carrier frequency.
[0033]
The intermediate signal formation circuit 26 is provided with a PLL circuit (phase locked loop
circuit).
The PLL circuit forms a stable intermediate transmission signal based on the signal modulated by
the FM modulation circuit 25 and the carrier frequency.
As the carrier frequency, a frequency corresponding to the transmission channel CHX set by the
transmission channel setting unit 12 is used.
By changing the setting of the transmission channel CHX, the carrier frequency is changed.
[0034]
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9
The wireless receiver 30 will be described with reference to FIG. The wireless receiver 30
includes an operation unit 40 for setting the reception channel CHY, and a reception unit 50
associated with each reception channel CHY on a one-to-one basis. The wireless receiver 30 is
configured by a combination of a plurality of receiving units. Each receiving unit is composed of
a plurality of receiving units 50.
[0035]
The operation unit 40 is provided on the front of the main body of the wireless receiver 30 (see
FIG. 1). The operation unit 40 is provided with a reception channel setting unit 41 for setting the
reception channel CHY, and a search unit 42 for searching the reception channel CHY which can
be used and displaying the result.
[0036]
The reception channel setting unit 41 is provided with a first reception setting unit 43 for setting
a reception group GRY and a second reception setting unit 44 for setting a specific reception
channel CHY in the group. The first reception setting unit 43 is provided with a first selection
button 43A for selecting a reception group GRY and a group display unit 43B for displaying the
selected reception group GRY. The second reception setting unit 44 is provided with a second
selection button 44A for selecting the reception channel CHY and a channel display unit 44B for
displaying the selected reception channel CHY.
[0037]
The search section 42 displays a search start button 45 for starting a “settable channel search
process” for searching for a settable channel CHD among a plurality of reception channels CHY,
and a result display for displaying the search process result A section 46 (display device) and a
display button 47 for displaying the search processing results in order are provided.
[0038]
As shown in FIG. 4, the receiving unit 50 demodulates a predetermined frequency signal from the
mixer 5 and a signal processing circuit 52 converts the signal from the demodulator 51 into a
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10
signal conforming to a predetermined standard. And a D / A conversion circuit 53 for converting
the signal from the signal processing circuit 52 into an analog signal.
Furthermore, the receiving unit 50 includes an operation unit 54 that issues an instruction to the
operation unit 40 and the signal processing circuit 52, and a storage unit 55 that stores the
signal from the operation unit 54 and the signal from the operation unit 40. The storage unit 55
is configured of a random access memory. The signal formed by the D / A conversion circuit 53
is output to the mixer 6.
[0039]
The arithmetic unit 54 detects the signal level of the same signal based on the signal from the
signal processing circuit 52, and determines whether the signal level is larger than a
predetermined determination value. Then, when the signal level is larger than the determination
value, the calculation unit 54 determines that a signal from an external device other than the
wireless microphone system 1 is received, and a signal indicating that the same channel is used
for the external device (Hereafter, "external use signal") is output.
[0040]
One of the plurality of operation units 54 is provided as the main operation unit 54A, and the
operation units 54 of the other reception units 50 are provided as the sub-operation units 54B
subordinate to the main operation unit 54A. The main calculation unit 54A and the sub
calculation unit 54B are connected to each other. When the main operation unit 54A and the sub
operation unit 54B are not distinguished from each other, the operation unit 54 is referred to as
described above.
[0041]
The main operation unit 54A recognizes the channel of the external use signal output from the
operation unit 54A and the sub operation unit 54B. Then, based on the externally used signal, a
channel (hereinafter referred to as “interference channel CHC”) that may interfere with these
channels is extracted by calculation, and an interference signal indicating the interference
channel CHC is output.
01-05-2019
11
[0042]
In addition, the main operation unit 54A executes a “configurable channel search process” for
searching for a channel that is less likely to cause interference. Then, the channel searched by
the “settable channel search process” is output as the settable channel CHD. The settable
channel CHD is shown in the result display unit 46 as a channel that can be recommended for
use by the user at the time of channel setting of the wireless microphone system 1.
[0043]
The storage unit 55 stores the following states (a) to (c) based on the signals output from the
operation unit 54, that is, the external use signal and the interference signal. (A) When the
external use signal is output from the operation unit 54, the frequency corresponding to the
reception channel CHY of the reception unit 50 to which the operation unit 54 belongs is used
by an external device other than the wireless microphone system 1, ie, It stores that this
reception channel CHY is the external use channel CHB.
[0044]
(B) If an interference signal is output from the operation unit 54, interference may occur if the
reception channel CHY of the reception unit 50 to which the operation unit 54 belongs is
temporarily used, that is, this reception channel CHY is an interference channel CHC. Remember
that it is.
[0045]
(C) When the signal level is output from the operation unit 54, the signal level (the magnitude of
the signal level) of the reception channel CHY of the reception unit 50 to which the operation
unit 54 belongs is stored.
The signal level is used to determine whether the reception channel CHY is the external use
channel CHB.
01-05-2019
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[0046]
A method of setting the interference channel CHC extracted by the operation unit 54 will be
described with reference to FIG. The range A associated with each channel shown in the figure
indicates the range in which interference occurs.
[0047]
Whether interference occurs is determined based on whether interference occurs between any
two channels. Specifically, when an arbitrary selected channel CHA is in use and another channel
having a frequency close to the frequency of the selected channel CHA is used, the frequency of
the other channel is selected. It is determined that it belongs to the interference band of channel
CHA. This determination may be made, for example, in advance by trially emitting from the
microphone 10 and measuring.
[0048]
In the present embodiment, it has been confirmed that the critical region where interference
occurs, that is, the boundary region between the region where interference occurs and the region
where interference does not occur is from 0.250 MHz to 0.375 MHz from the selected channel
CHA. Therefore, a channel belonging to a frequency band at least more than 0.375 MHz from the
frequency of the arbitrarily selected selected channel CHA does not interfere with the selected
channel CHA.
[0049]
Therefore, the interference channel CHC which interferes with the external use channel CHB is
set as follows. The frequency of the channel set to the external use channel CHB is used as a
reference frequency, the frequency that is 0.375 MHz (first decrement frequency) smaller than
the reference frequency is used as a first frequency, and 0.375 MHz (second incremental
frequency) than the reference frequency ) A second frequency between the large frequency and
the other frequency. Then, all channels corresponding to the frequency band between the first
frequency and the second frequency are set as the mixed channel CHC.
01-05-2019
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[0050]
A "configurable channel search process" for searching for a channel with a low possibility of
interference from a plurality of reception channels will be described. The same process is
performed when the search start button 45 is pressed.
[0051]
The procedure of the “configurable channel search process” will be described with reference
to FIG. In step S110, it is determined whether the search start button 45 has been pressed. When
it is determined that the search start button 45 has been pressed, the processing after step S120
is performed. When it is determined that the search start button 45 is not pressed, the “settable
channel search process” is ended.
[0052]
Next, in step S120, an “externally used channel determination process” is executed to
determine whether or not signals from external devices other than the wireless microphone
system 1 are received. The “external use channel determination process” is performed in order
from the channel with the smallest frequency.
[0053]
Specifically, the reception channel CHY with the smallest frequency is associated with the
number 1, a predetermined integer is associated with the channel with the smallest frequency,
and the channel with the largest frequency is associated with the largest integer (parameter
Nmax). Then, an operation of sequentially raising the parameter N from 1 to Nmax is performed
(step S140), and "externally used channel determination processing" is performed on the
reception channel CHY having the same integer as the parameter N. When the parameter
exceeds Nmax (step S130), the subsequent steps are taken. Thereby, the “externally used
channel determination process” is performed on all the reception channels CHY. Hereinafter,
executing “externally used channel determination processing” in order from a channel with a
01-05-2019
14
smaller frequency is referred to as “channel scan”.
[0054]
In the channel map of FIG. 8, the channel corresponding to 806.125 MHz is set to parameter N =
1, and “externally used channel determination processing” is executed sequentially from the
same channel one by one. Then, in the same process, it is checked for each channel whether or
not signals from external devices other than the wireless microphone system 1 are received. If it
is determined that the signal from the external device is being received, setting is made for the
channel to be the external use channel CHB.
[0055]
In step S150, the interference channel CHC is set according to the above interference channel
setting method based on the result of the channel scan. Then, the external use channel CHB and
the interference channel CHC are excluded from all the channels to extract the settable channel
CHD.
[0056]
In step S160, the number of settable channels CHD is calculated for each group. Further, among
the groups, a group having the largest number of settable channels CHD (hereinafter,
“maximum settable group GRZ”) is extracted.
[0057]
In step S170, the settable channel CHD of the smallest number among the settable largest group
GRZ extracted in step S160 is set as the reception channel CHY of the wireless receiver 30. Then,
the settable channel CHD is displayed on the result display unit 46.
[0058]
The user who sets the channel of the wireless microphone system 1 can set the group and
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channel of the microphones 10 with reference to the numbers displayed on the result display
unit 46.
[0059]
That is, when setting the channel, the user (1) presses the search start button 45, (2) sets the
channel of the microphone 10 based on the number displayed on the result display unit 46. With
only two operations, it is possible to set a channel setting that is less likely to cause interference.
[0060]
The procedure of the above-mentioned "externally used channel determination process" will be
described with reference to FIG.
The “externally used channel determination process” is sequentially performed for each
channel.
Hereinafter, the procedure of the “externally used channel determination process” for the
channel corresponding to the parameter N (hereinafter, “N channel”) will be described.
[0061]
In step S210, the N channel receiver 50 is set to the reception state. Next, in step S220,
measurement of time X is started. Then, in step S230, it is determined whether the signal level of
the receiving unit 50 is larger than the determination value. The judgment value is set to the
same value as the maximum value of the magnitude at which interference does not occur with
the reception channel CHY when the external radio wave from the external device enters. When
the signal level of the receiving unit 50 is larger than the determination value, the N channel is
set to the external use channel CHB in step S240.
[0062]
In step S230, when the signal level of the receiver 50 is equal to or less than the determination
01-05-2019
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value, it is determined in step S250 whether the time X is larger than the determination time.
That is, it is determined whether the signal level of the receiving unit 50 is larger than the
determination value until the determination time has elapsed. When the time X exceeds the
determination time, the N channel of the reception unit 50 is set to the unused channel CHE in
step S260.
[0063]
Extraction of the settable channel CHD will be described with reference to FIG. In the following,
extraction of the settable channels CHD will be described by taking an example where each
channel is classified into six groups and each group is constituted by five channels. First, the
channel configuration of the wireless receiver 30 will be specifically described.
[0064]
The channel map shown in FIG. 8 indicates the group to which the reception channel CHY
belongs and the channel numbers in that group. The group column of the group column
describes a code in which a group to which a channel belongs and a channel number are
combined. For example, the channel corresponding to the frequency 806.125 MHz belongs to
the F group, and the channel number is 1. The channel corresponding to the frequency 806.250
MHz belongs to the D group, and the channel number is 1.
[0065]
In the permutation in which the reception channels CHY are arranged in ascending order of
frequency, adjacent channels are assigned such that the groups are different. For example, a
channel having a frequency of 806.125 MHz belongs to the F group, and a channel having a
frequency of 806.250 MHz adjacent to this channel belongs to the D group.
[0066]
In the same group, adjacent channels are set to be separated by 0.750 MHz. The 0.750 MHz
corresponds to twice the frequency width at which interference does not occur in the wireless
01-05-2019
17
standard to which the wireless microphone system 1 conforms. Therefore, temporarily, when
using the wireless microphone system 1 in an environment without the externally used channel
CHB, when the channels to be used are set in the same group, interference does not occur
between the set channels.
[0067]
Furthermore, the reception channel CHY in the A group and the reception channel CHY in the B
group are set to be separated by at least 0.375 MHz. The 0.375 MHz corresponds to a frequency
width not to cause mutual interference in the wireless standard to which the wireless
microphone system 1 conforms. Therefore, temporarily, when using the wireless microphone
system 1 in an environment without the externally used channel CHB, when the channels to be
used are set in the A group and the B group, no interference occurs between the set channels. In
such a setting, up to 10 channels can be used since two groups are used. Further, the relationship
between the C group and the D group and the relationship between the E group and the F group
are set in the same manner as the relationship between the A group and the B group.
[0068]
The process until the settable channel CHD is extracted will be described. The channel map of
FIG. 8 shows a state when the processing from step S110 to step S160 is performed.
[0069]
In the column of the external use channel CHB, it is indicated whether each reception channel
CHY is the external use channel CHB. FIG. 8 shows that there are four externally used channels
CHB. In the column of interference channels CHC, the external use channel CHB and channels
which are likely to cause interference are shown.
[0070]
In the example shown in FIG. 8, the front three and three rear channels of each external use
channel CHB are set as the interference channel CHC based on the setting method of the
interference channel CHC, and a total of 14 channels are interference channels. It is set to CHC.
01-05-2019
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[0071]
The channels set to the external use channel CHB and the interference channel CHC are
considered as channels that can not be set (hereinafter, "non-settable channels CHF").
The channel of the dot area in the group column becomes the unsettable channel CHF. Therefore,
in the group column, channels other than the dot area are settable channels CHD.
[0072]
Thus, after the settable channels CHD are set, the number of settable channels CHD is counted
for each group. The number of settable channels indicates the number of settable channels CHD
of each group. Further, among the groups, the settable largest group GRZ having the largest
number of settable channels CHD is selected. In the example of FIG. 8, the F group is extracted as
the settable most frequent group GRZ. Then, “1”, which is the smallest of the channel numbers
of “F group” and F group settable channels CHD, is displayed on the result display unit 46 as
the settable channel CHD.
[0073]
According to the present embodiment, the following effects can be achieved. (1) In the present
embodiment, a plurality of reception channels CHY are divided into a plurality of groups, and
each of the groups is a combination of reception channels CHY in which interference does not
occur due to use in the same group. Further, one group is selected as a selected group from a
plurality of groups, and among the reception channels CHY in this selection group, each
reception channel CHY other than the externally used channel CHB and the interference channel
CHC is extracted as a settable channel CHD Ru.
[0074]
When a plurality of reception channels CHY other than the external use channel CHB and the
interference channel CHC are used, interference may occur between the used reception channels
01-05-2019
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CHY. In this respect, according to the above configuration, a group is a combination of reception
channels CHY in which interference does not occur due to use in the same group. In addition,
since the reception channels CHY other than the external use channel CHB and the interference
channel CHC are settable channels CHD in the same group, interference between the set channels
can be suppressed. Therefore, the user of the wireless receiver 30 can easily set the reception
channel CHY of the wireless receiver 30 based on the settable channel CHD.
[0075]
(2) In the present embodiment, the number of settable channels CHD is obtained for each group.
The group with the largest number of these is selected as the settable largest group GRZ, and this
settable largest group GRZ is set as the selected group. Then, among the reception channels CHY
in this selected group, each reception channel CHY other than the external use channel CHB and
the interference channel CHC is set as the settable channel CHD.
[0076]
According to this configuration, since the reception channels CHY that do not interfere with each
other in the settable largest number group GRZ are set as the settable channels CHD, the number
of channels that can be used by the user can be increased.
[0077]
(3) In the present embodiment, a reception channel having a frequency between the first
frequency and the second frequency is extracted as the interference channel CHC.
Here, the first frequency is the lowest from the frequency (external frequency) in the range
where the channels interfere with each other when two or more channels are used before and
after the frequency (external frequency) corresponding to the external use channel CHB. The
frequency is on the frequency side. The second frequency is the frequency farthest to the high
frequency side from the frequency (external frequency) corresponding to the external use
channel CHB.
[0078]
According to this configuration, the frequencies belonging to the bands that interfere with each
01-05-2019
20
other when setting the channel are considered to correspond to the interference channel CHC
and are excluded from the settable channel CHD, so that interference between the channels is
suppressed more reliably. be able to.
[0079]
(4) In the present embodiment, the signal level is acquired for each of the plurality of reception
channels CHY, each of the reception channels CHY is compared with the determination value,
and when the signal level is larger than the determination value, the reception channel CHY is
external. The channel used is CHB.
[0080]
According to this configuration, by comparing the signal level and the determination value, it is
determined whether there is an externally used channel CHB used by an external device other
than the wireless receiver 30.
For this reason, it is possible to reliably grasp the external use channel CHB which may cause
interference.
[0081]
(5) In the present embodiment, the result display unit 46 (display device) for displaying the
settable channel CHD is provided.
According to this configuration, since the settable channel CHD can be indicated to the user of
the wireless receiver 30 by the result display unit 46, the user looks at the settable channel CHD
indicated by the result display unit 46, You can easily set the channel.
[0082]
(6) In the present embodiment, the wireless microphone system 1 includes the wireless receiver
30 of the above configuration and the microphone 10 of the above configuration. According to
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21
this configuration, since the wireless receiver 30 shows the settable channel CHD, the user of the
wireless receiver 30 can easily set the reception channel CHY of the wireless receiver 30 and the
transmission channel CHX of the microphone 10. Can.
[0083]
Second Embodiment A second embodiment of the present invention will be described with
reference to FIG. The wireless microphone system 1 of this embodiment is obtained by adding
the following change to the configuration of the first embodiment. That is, in the first
embodiment, an example in which the present invention is applied to a wireless microphone
system 1 that converts an audio signal into a digital signal is described. On the other hand, in the
present embodiment, the present invention is applied to the wireless microphone system 1 which
converts an audio signal into an analog signal. Hereinafter, detailed changes from the
configuration of the first embodiment that occur as a result of this change will be described. The
same reference numerals as in the first embodiment denote the same parts as in the first
embodiment, and a description thereof will be omitted.
[0084]
The wireless microphone system 1, the microphone 10 and the wireless receiver 30 have the
same configuration as the first embodiment except that the A / D conversion circuit 21 and the D
/ A conversion circuit 53 are not provided. When the analog transmission signal is received by
the wireless receiver 30 and when the digital transmission signal is received, the relationship
between channels in which interference occurs differs. Therefore, in the analog wireless
microphone system 1, “externally used channel determination processing” different from the
digital wireless microphone system 1 is performed.
[0085]
The procedure of the “configurable channel search process” in the present embodiment will be
described with reference to FIG. In step S310, it is determined whether the search start button 45
has been pressed. When it is determined that the search start button 45 has been pressed, the
processes after step S320 are executed. When it is determined that the search start button 45 is
not pressed, the “settable channel search process” is ended.
01-05-2019
22
[0086]
In step S320, an "externally used channel determination process" is performed to determine
whether there is a possibility that a signal from an external device other than the wireless
microphone system 1 has been received. The “external use channel determination process” is
performed in order from the channel with the smallest frequency.
[0087]
In step S350, a channel affected by mutual third order modulation distortion of the externally
used channel CHB (hereinafter, "third order interference channel CHG") is calculated. With regard
to the tertiary interference channel CHG, an interference map may be created by calculating or
measuring in advance for each reception channel CHY, and this interference map may be
referred to.
[0088]
In step S360, the settable channel CHD is extracted by excluding the external use channel CHB
and the tertiary interference channel CHG from all the channels. In step S370, the number of
settable channels CHD in each group is calculated. Furthermore, in each group, the group with
the largest number of configurable channels CHD is extracted.
[0089]
In step S380, the group extracted in step S360 is displayed on the group display unit 43B, and
the settable channel CHD having the smallest channel number among the groups is displayed on
the channel display unit 44B.
[0090]
According to the present embodiment, in addition to the effects (1) to (6) of the first embodiment,
the following effects can be achieved.
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23
(7) In the present embodiment, a channel having a frequency affected by the mutual third order
modulation distortion of the frequency corresponding to the externally used channel CHB is
extracted as the interference channel CHC. According to this configuration, the user of the
wireless receiver 30 can compare the channel having the frequency affected by the mutual third
order modulation distortion of the frequency corresponding to the externally used channel CHB
as the interference channel CHC, It is possible to more reliably indicate the reception channel
CHY in which interference does not occur.
[0091]
Third Embodiment A third embodiment of the present invention will be described with reference
to FIG. The wireless microphone system 1 of this embodiment is obtained by adding the
following change to the configuration of the first embodiment. That is, in the first embodiment,
the present invention is applied to a case where each channel is classified into six groups, and the
settable channels CHD are extracted for each group. On the other hand, in the present
embodiment, the settable channels CHD are extracted regardless of the group. Hereinafter,
detailed changes from the configuration of the first embodiment that occur as a result of this
change will be described. The same reference numerals as in the first embodiment denote the
same parts as in the first embodiment, and a description thereof will be omitted.
[0092]
In the process of extracting the settable channel CHD, the process until the external use channel
CHB and the interference channel CHC are searched is the same as that of the first embodiment.
Among all the channels, channels other than the externally used channel CHB and the
interference channel CHC are available channels (unused channel CHE). However, when channels
are set in ascending order of frequency, interference occurs between adjacent channels.
[0093]
In this regard, in the first embodiment, the channels form a group in which interference does not
occur, and the channels are set in the same group. That is, the settable largest group GRZ is
extracted, and the reception channel CHY in the settable largest group GRZ is set as the settable
channel CHD.
01-05-2019
24
[0094]
On the other hand, in the present embodiment, among all channels, in a group constituted by
channels other than the externally used channel CHB and the interference channel CHC (unused
channel CHE), the channels do not cause mutual interference regardless of the group. Select the
receiving channel CHY. Therefore, the reception channels CHY are selected from the above group
so as to be apart from 0.375 MHz which is a frequency width not interfering with each other in
the standard to which the wireless microphone system 1 is applied. There are a plurality of
combinations of configurable channels CHD extracted by such selection of rules. Some of these
are shown in FIG.
[0095]
Column X in the column of combination is an example of a combination of configurable channels
CHD extracted based on the above rule in a plurality of unused channels CHE. In this case, since
the intervals between adjacent channels need to be at least 0.375 MHz, the number of settable
channels CHD is four. The numbers in column X indicate identification numbers assigned in the
combination group formed by the extracted configurable channels CHD.
[0096]
The Y column in the column of combination is another example of the combination of
configurable channels CHD extracted based on the above rules. In this case, the number of
settable channels CHD is four, as in the case of the above-described X column.
[0097]
Column Z in the column of combination is another example of the combination of configurable
channels CHD extracted based on the above-mentioned rule. In this case, the number of settable
channels CHD is three, unlike the case of the above-described X-row.
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[0098]
In this manner, the number of settable channels CHD is calculated for each combination, and a
combination having the largest number of settable channels CHD among these combinations (a
settable largest group GRZ) is extracted. In FIG. 10, combinations of X columns and combinations
of Y columns are extracted.
[0099]
When a plurality of combinations are extracted, an average value of signal levels is determined
for each combination, and an average value of signal levels for each combination is compared.
Then, a combination having the lowest average value of signal levels is selected. In FIG. 10, Q2 is
assumed to be the smallest value among Q1 to Q3 as an average value of signal level values. In
such a case, the combination of the column Y is selected as the settable most frequent group
GRZ. Then, among the reception channels CHY belonging to this combination, the channel
number corresponding to the reception channel CHY having the smallest number, that is,
806.125 MHz is displayed on the result display unit 46.
[0100]
According to the present embodiment, in addition to the effects (2) to (6) of the first embodiment,
the following effects can be achieved. (8) In the present embodiment, a plurality of combinations
are extracted from the group configured by the unused channel CHE. This combination is
considered not to interfere with each other when using a plurality of unused channels CHE in the
combination. Then, one of the extracted combinations is selected, and the reception channel CHY
belonging to the selected one combination is set as the settable channel CHD.
[0101]
According to this configuration, a combination that does not interfere with each other is
extracted from the unused channels CHE, and the unused channels CHE belonging to this
combination are made the settable channel CHD. Therefore, interference between the settable
channels CHD can be suppressed.
01-05-2019
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[0102]
Fourth Embodiment A fourth embodiment of the present invention will be described with
reference to FIG. The wireless microphone system 1 of this embodiment is obtained by adding
the following change to the configuration of the first embodiment. That is, in the first
embodiment, among the groups, the group having the largest number of settable channels CHD
is selected as the settable largest group GRZ. On the other hand, in the present embodiment,
when there are a plurality of settable largest groups GRZ, the average value of the signal level of
the external use channel CHB is compared for each group, and the group having the smallest
average signal level is displayed in the result display unit 46. Select as the settable most frequent
group GRZ to be displayed. Hereinafter, detailed changes from the configuration of the first
embodiment that occur as a result of this change will be described. The same reference numerals
as in the first embodiment denote the same parts as in the first embodiment, and a description
thereof will be omitted.
[0103]
The procedure of the “configurable channel search process” in the present embodiment will be
described with reference to FIG. The process from step S410 to step S460 is the same as the
process to step S110 to S160 of the "configurable channel search process" of the first
embodiment. Next, in step S470, it is determined whether or not a plurality of settable maximum
number groups GRZ have been extracted. When the result in Step S470 is NO, the settable most
frequent group GRZ is displayed on the result display unit 46 in Step S490.
[0104]
On the other hand, when an affirmative determination is made in step S470, the average signal
levels of externally used channels CHB belonging to the group are compared for each group set
as the settable largest group GRZ in step S480, and the settable largest number having the
smallest average signal level is obtained. Elect a group GRZ. Then, in step S 490, the settable
largest group GRZ and the settable channel CHD having the smallest channel number among the
groups are displayed on the result display unit 46.
[0105]
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27
According to the present embodiment, in addition to the effects (1) to (5) of the first embodiment,
the following effects can be achieved. (9) In the present embodiment, an average value (average
signal level) of signal levels is obtained for the external use channel CHB in the group, and when
there are a plurality of settable maximum groups GRZ, the signal level among the settable
maximum groups GRZ The group with the smallest average value of is extracted. Then, among
the reception channels CHY in this group, the external use channel CHB and each reception
channel CHY other than the interference channel CHC are extracted as the settable channel CHD.
[0106]
According to this configuration, when there are a plurality of settable maximum groups GRZ, the
average value of the signal level of the external use channel CHB is obtained for each group, and
the settable maximum group GRZ having the smallest average signal level is the selected group It
is assumed. Then, each reception channel CHY other than the selected group, the external use
channel CHB, and the interference channel CHC is set as the settable channel CHD. Therefore, it
is possible to show the user a group that is least likely to cause interference.
[0107]
(Other Embodiments) The embodiments of the present invention are not limited to the
embodiments exemplified in the above-described embodiments, and may be modified as shown
below, for example. Further, each of the following modifications is not limited to the above
embodiments, and different modifications may be combined with each other.
[0108]
In the first embodiment, the interval between the minimum value in the interference channel
CHC range and the reference frequency and the interval between the maximum value in the
interference channel CHC range and the reference frequency are set to the same value. It may be
a different value. That is, the absolute value of the first decrement frequency and the absolute
value of the second incremental frequency may be different values.
01-05-2019
28
[0109]
In the first embodiment, whether or not the external use channel CHB is determined based on the
signal level, but the parameter for determining this is not limited to the signal level. For example,
the C / N ratio can also be used as a parameter of determination.
[0110]
In the first embodiment, the reception channels CHY of the wireless receiver 30 are grouped so
as not to interfere with each other, and then the settable channels CHD are extracted. However,
without performing such grouping, the reception channels CHY other than the external use
channel CHB and the interference channel CHC among all the reception channels CHY can be
settable channels CHD.
[0111]
According to this configuration, since the reception channel CHY other than the external use
channel CHB and the interference channel CHC is presented to the user of the wireless receiver
30, the user can easily set up the reception channel CHY which is less likely to cause
interference. can do. Note that this setting is preferably applied in a situation where interference
does not occur even if channels adjacent to each other are used in channel order in which
frequencies are aligned in ascending order.
[0112]
In the first embodiment, in step S170, the settable channel CHD having the smallest number
among the settable largest group GRZ is set as the reception channel CHY. On the other hand,
processing may be performed as follows to allow the user to select a channel to be actually set.
[0113]
That is, in step S170, the result display unit 46 displays the settable most frequent group GRZ
01-05-2019
29
extracted in step S160 and the settable channel CHD having the smallest number in the same
group. At this time, in the receiving system 3, the settable channel CHD is not set. Then, the user
is put in a standby state for selecting any of the settable channels CHD. That is, in the standby
state, when the display button 47 is pressed, the settable channels CHD among the settable
largest group GRZ are displayed on the result display unit 46 in order. When the second
reception setting unit 44 is pressed, the settable channel CHD is made selectable. Thereby, the
user refers to the numbers displayed on the group display unit 43B and the channel display unit
44B, selects one of the displayed numbers, and selects the group and channel of the microphone
10 and the wireless receiver 30. can do. The user can arbitrarily select a channel with less
interference among the settable channels CHD.
[0114]
In the first embodiment, the user who sets the channel of the wireless microphone system 1
refers to the group display unit 43B and the channel display unit 44B shown in the result display
unit 46 of the wireless receiver 30, and can Set up groups and channels. In such a configuration,
when interference occurs due to the occurrence of jamming waves and the user changes the
channel of the microphone 10, the user approaches the wireless receiver 30 to check the display
on the result display unit 46. Channel needs to be set. Therefore, the wireless receiver 30 and the
microphone 10 may be provided with a short distance wireless device such as Bluetooth, and the
information of the settable channel CHD extracted first may be transmitted and displayed on the
microphone 10. According to such a configuration, since the settable channel CHD displayed on
the microphone 10 can be referred to, the channel can be changed even when the user is not
approaching the wireless receiver 30.
[0115]
In the second embodiment, the configuration in which the channel affected by the mutual thirdorder modulation distortion of the external use channel CHB is excluded from the configurable
channel CHD as the third-order interference channel CHG with respect to the wireless receiver
30 compatible with analog signals It is applied. Such a configuration can also be applied to the
digital wireless receiver 30.
[0116]
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30
In the third embodiment, the combination of the settable channels CHD is extracted so that
interference does not occur between the channels regardless of the group. As a condition for
determining this combination, the reception channels CHY are selected to be separated by an
interval of 0.375 MHz or more so that the selected settable channels CHD do not interfere with
each other. Alternatively, the frequency spacing between channels can be greater or less than
0.375 MHz. For example, when the field intensity from the microphone 10 is small, the
frequency interval between the settable channels CHD can be made smaller than 0.375 MHz.
[0117]
In the fourth embodiment, when a plurality of settable maximum number groups GRZ are
extracted after the “settable channel search process”, the average of the signal levels is
compared between the groups, and the reception channel of the group with the smallest signal
level is obtained. The CHY is displayed on the result display unit 46. On the other hand, the
reception channel CHY of the group in which the average value of the S / N ratio is the smallest
can be displayed on the result display unit 46.
[0118]
In the second to fourth embodiments, the settable channels CHD, which are the search results of
the “settable channel search process”, are displayed on the result display unit 46, but may be
output by voice.
[0119]
DESCRIPTION OF SYMBOLS 1 ... Wireless microphone system, 2 ... Transmission system, 3 ...
Reception system, 4 ... Wireless antenna, 5 ... Mixer, 6 ... Mixer, 7 ... Amplifier, 8 ... Speaker, 10 ...
Microphone, 11 ... Head part, 12 ... Transmission Channel setting unit, 12A: first transmission
setting unit, 12B: second transmission setting unit, 12C: first rotary switch, 12D: second rotary
switch, 13: signal processing unit, 14: transmission unit, 21: A / D Conversion circuit 22 Signal
formation unit 23 Amplification circuit 24 Signal processing circuit 25 FM modulation circuit 26
Intermediate signal formation circuit 30 Wireless receiver 40 Operation unit 41 Reception
channel setting unit , 42: search unit, 43: first reception setting unit, 43A: first selection button,
43B: group display unit, 44: second reception setting unit, 44A: second selection button , 44B:
channel display unit, 45: search start button, 46: result display unit, 47: display button, 50:
reception unit, 51: demodulator, 52: signal processing circuit, 53: D / A conversion circuit, 54:
Arithmetic unit, 55: storage unit.
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