JP2012119939A - Wireless receiver and wireless microphone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless receiver and a wireless microphone system capable of setting a channel with less interference automatically.SOLUTION: The wireless receiver extracts an external use channel to be used by an external device, and an interference channel which may interfere with at least one of the external use channels being used by the wireless receiver. Then, the wireless receiver extracts all reception channels except the external use channels and interference channels within reception channels as settable channels.

Description

  The present invention relates to a wireless receiver that includes a plurality of reception channels and receives a transmission signal from a microphone having a plurality of transmission channels, and a wireless microphone system thereof.

As the wireless receiver, for example, the one described in Patent Document 1 is known.
The wireless receiver receives signals from a plurality of microphones and reproduces the signal of each microphone. Each microphone has a plurality of channels and transmits a signal at a frequency corresponding to the set channel. The wireless receiver is set to be able to receive a channel having the same frequency as the channel set in the microphone, and receives a signal from the microphone. That is, when a plurality of microphones are used, a plurality of channels are used simultaneously and in the same space.

  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, interference may occur due to the influence of radio waves. For this reason, it is necessary to set the channel selection so that interference does not occur. Specifically, in order to avoid interference between channels to be used, in order to avoid interference with external radio waves, channels corresponding to the frequency of the radio waves are excluded and channels are set.

However, such setting is complicated and difficult for those who do not know the technology of the wireless microphone system.
Therefore, in Patent Document 1, it is automatically detected whether or not there is an external signal having a frequency other than the frequency of the channel used in the wireless receiver, the channel corresponding to this external signal is excluded, and the microphone and the wireless reception are performed. Set the machine channel.

Japanese Patent Laid-Open No. 10-200344

However, as described above, interference may occur even if the channel corresponding to the signal from the outside is excluded and the microphone and wireless receiver are set.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wireless receiver and a wireless microphone system capable of automatically setting a channel with less interference.

In the following, means for achieving the above object and its effects are described.
(1) According to the first aspect of the present invention, a wireless receiver having a plurality of reception channels and receiving a transmission signal from a microphone having a plurality of transmission channels extracts an external use channel used by an external device. The gist is to extract an interference channel that may interfere with the external use channel and to extract each of the plurality of reception channels other than the external use channel and the interference channel as a configurable channel. .

  According to the present invention, the reception channels other than the external use channel and the interference channel are settable channels that can be set by the user. For this reason, the user can easily set a reception channel in which no interference occurs.

  (2) The invention described in claim 2 is the wireless receiver according to claim 1, wherein the plurality of reception channels are divided into a plurality of groups, and each of the groups has interference due to use within the same group. A combination of the reception channels that does not occur, one of the plurality of groups is set as a selection group, and among the reception channels in the selection group, each of the reception channels other than the external use channel and the interference channel can be set. It is a summary.

  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-described configuration, it is possible to suppress interference between the set channels.

  (3) In the wireless receiver according to claim 2, the number of the settable channels is obtained for each of the groups, and the group having the largest number is set as the maximum settable group. The gist is to select and set the most configurable group as the selected group.

  According to the present invention, the number of reception channels that do not cause mutual interference is obtained for each group, and the group with the largest number is selected as the settable maximum group. In addition, since the reception channels that do not interfere with each other in the settable maximum group are settable channels, the number of channels that can be used by the user can be increased.

  (4) In the invention according to claim 4, in the wireless receiver according to claim 3, an average value of the signal level of the external use channel is obtained for each of the groups, and there are a plurality of settable maximum groups. In this case, the group having the smallest average value of the signal levels is extracted from the most configurable groups, and this group is set as the selected group.

  According to the present invention, when there are a plurality of settable maximum groups, the average value of the signal level of the externally used channel is obtained for each group, and the settable maximum group having the smallest average signal level is set as the selected group. . In the selected group, each reception channel other than the external use channel and the interference channel is settable. For this reason, it is possible to indicate to the user the group that is least prone to interference.

  (5) The invention according to claim 5 is the wireless receiver according to any one of claims 1 to 4, wherein two or more channels are used before and after including an external frequency corresponding to the external use channel. In the range where the channels interfere with each other, the frequency that is farthest from the external frequency to the lowest frequency side is the first frequency, and the frequency that is farthest from the external frequency to the highest frequency side is the second frequency. The gist is to extract the reception channel having a frequency between a frequency and the second frequency as the interference channel.

  According to the present invention, the frequencies belonging to the bands that interfere with each other when the channels are set correspond to the interference channels and are excluded from the settable channels, so that the interference between channels can be more reliably suppressed. Can do.

  (6) The invention according to claim 6 corresponds to the frequency affected by the mutual third-order modulation distortion of the frequency of the external use channel in the wireless receiver according to any one of claims 1 to 5. The gist is to extract a channel as the interference channel.

  According to the present invention, interference occurs in the user of the wireless receiver as compared with the case where a channel having a frequency affected by the mutual third-order modulation distortion of the frequency corresponding to the external use channel is not set as the interference channel. It is possible to reliably indicate a reception channel with a low risk.

  (7) The invention according to claim 7 is a wireless microphone system comprising the wireless receiver according to any one of claims 1 to 6 and a microphone.

  According to the present invention, since the settable channel is indicated on the wireless receiver, the user of the wireless receiver can easily set the reception channel of the wireless receiver and the transmission channel of the microphone.

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 band which interferes with a selection channel about the wireless receiver of the embodiment. 7 is a flowchart showing a procedure of “configurable channel search processing” executed in the wireless receiver of the embodiment. 6 is a flowchart showing a procedure of “external channel determination processing” executed in the wireless receiver of the embodiment. The channel map which shows the group of each receiving channel, and a configurable channel about the wireless receiver of the embodiment. The flowchart which shows the procedure about the "configurable channel search process" performed in the wireless receiver of 2nd Embodiment of this invention. The channel map which shows the group of each receiving channel, and a configurable channel about the wireless receiver of 3rd Embodiment of this invention. The flowchart which shows the procedure about the "configurable channel search process" performed in the wireless receiver of 4th Embodiment of this invention.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.
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 the audio signal.

  The transmission system 2 includes a plurality of microphones 10. The receiving system 3 hybridizes the wireless antenna 4, the mixer 5 that mixes the signal from the wireless antenna 4, the wireless receiver 30 that demodulates the signal from the mixer 5, and the signal from the wireless receiver 30. A mixer 6, an amplifier 7 for amplifying a signal from the mixer 6, and a speaker 8 are provided.

  The microphone 10 and the receiving system 3 have a plurality of channels. Each channel is assigned one frequency. In the present 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).

  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 channels corresponding to each other. 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 a plurality of microphones 10, a plurality of channels are used simultaneously.

  The channels of the microphone 10 are divided into six A groups to F groups 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 a plurality of channels are used in the same group. Channels assigned to each group are assigned numbers in ascending order of frequency. In FIG. 8, group A includes channel No. 1 (A1) having a frequency of 806.750 MHz, channel No. 2 (A2) having a frequency of 807.500 MHz, channel No. 3 (A3) having a frequency of 808.250 MHz, and channel having a frequency of 809.000 MHz. No. 4 (A4) and channel No. 5 (A5) having a frequency of 809.750 MHz are allocated. Therefore, each channel is specified by specifying a group and a channel number. The channel of the reception system 3 is the same as the channel configuration of the microphone 10.

  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”. 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”.

  The microphone 10 includes a head unit 11 that detects sound by a sensor, a transmission channel setting unit 12 that sets a transmission channel CHX, and a signal processing unit that forms an audio signal based on a signal from the head unit 11 and a set channel. 13 and a transmission unit 14 for transmitting a signal formed by the signal processing unit 13.

  As shown in FIG. 2, the transmission channel setting unit 12 includes a first transmission setting unit 12A that sets a transmission group GRX and a second transmission setting unit 12B that sets a specific transmission channel CHX in the group. ing.

  The group is set by rotating the first rotary switch 12C and selecting a specific group number. The transmission channel CHX is set by rotating the second rotary switch 12D and selecting a specific channel number.

  As illustrated in FIG. 3, the signal processing unit 13 includes an A / D conversion circuit 21 that converts 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.

  The signal forming unit 22 includes a signal processing circuit 24 that converts the digital signal formed by the A / D conversion circuit 21 into a signal that conforms to a predetermined standard, and an FM modulation circuit 25 that performs FM modulation on the signal from the signal processing circuit 24. And an intermediate signal forming circuit 26 that forms an intermediate transmission signal based on the FM-modulated signal and the carrier frequency.

  The intermediate signal forming 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. The carrier frequency is changed by changing the setting of the transmission channel CHX.

The wireless receiver 30 will be described with reference to FIG.
The wireless receiver 30 includes an operation unit 40 that sets a reception channel CHY and a reception unit 50 that is associated with each reception channel CHY on a one-to-one basis. The wireless receiver 30 is composed of a combination of a plurality of receiving units. Each receiving unit includes a plurality of receiving units 50.

  The operation unit 40 is provided on the front part 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 for available reception channels CHY and displaying the results.

  The reception channel setting unit 41 is provided with a first reception setting unit 43 that sets a reception group GRY and a second reception setting unit 44 that sets 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.

  The search unit 42 includes 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 unit 46 (display device) and a display button 47 for displaying the search processing results in order are provided.

  As shown in FIG. 4, the receiving unit 50 includes a demodulator 51 that demodulates a predetermined frequency signal from the mixer 5, and a signal processing circuit 52 that converts the signal from the demodulator 51 into a signal that conforms to a predetermined standard. And a D / A conversion circuit 53 that converts a signal from the signal processing circuit 52 into an analog signal. Further, the receiving unit 50 includes a calculation unit 54 that issues a command to the operation unit 40 and the signal processing circuit 52, and a storage unit 55 that stores a signal from the calculation unit 54 and a signal from the operation unit 40. The storage unit 55 is configured by a random access memory. The signal formed by the D / A conversion circuit 53 is output to the mixer 6.

  The calculation unit 54 detects the signal level of the signal based on the signal from the signal processing circuit 52 and determines whether the signal level is larger than a predetermined determination value. When the signal level is higher 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 that the same channel is used by the external device. (Hereinafter referred to as “external use signal”).

  One of the plurality of calculation units 54 is provided as a main calculation unit 54A, and the calculation unit 54 of the other receiving unit 50 is provided as a sub calculation unit 54B subordinate to the main calculation unit 54A. The main calculation unit 54A and the sub calculation unit 54B are connected to each other. When the main calculation unit 54A and the sub calculation unit 54B are not distinguished, they are referred to as the calculation unit 54 as described above.

  The main calculation unit 54A grasps the channel of the external use signal output from the calculation unit 54A and the sub calculation unit 54B. Then, based on the external use signal, a channel that may interfere with these channels (hereinafter, “interference channel CHC”) is extracted by calculation, and an interference signal indicating the interference channel CHC is output.

  In addition, the main calculation unit 54A executes “configurable channel search processing” for searching for a channel that is less likely to cause interference. Then, the channel retrieved by the “configurable channel search process” is output as a configurable channel CHD. The settable channel CHD is displayed on the result display unit 46 as a channel that can be recommended to the user when setting the channel of the wireless microphone system 1.

The storage unit 55 stores the following states (a) to (c) based on the signal output from the calculation unit 54, that is, the external use signal and the interference signal.
(A) When an external use signal is output from the computing unit 54, the frequency corresponding to the reception channel CHY of the receiving unit 50 to which the computing unit 54 belongs is being used by an external device other than the wireless microphone system 1, that is, The fact that this reception channel CHY is an external use channel CHB is stored.

  (B) When an interference signal is output from the calculation unit 54, there is a possibility that interference will occur if the reception channel CHY of the reception unit 50 to which the calculation unit 54 belongs is used, that is, the reception channel CHY is used as the interference channel CHC. Remember that.

  (C) When the signal level is output from the calculation unit 54, the signal level (the magnitude of the signal level) of the reception channel CHY of the reception unit 50 to which the calculation unit 54 belongs is stored. The signal level is used to determine whether or not the reception channel CHY is an external use channel CHB.

  With reference to FIG. 5, the setting method of the interference channel CHC extracted by the said calculating part 54 is demonstrated. A range A associated with each channel shown in the figure indicates a range where interference occurs.

  Whether or not interference occurs is determined based on whether or not interference occurs between any two channels. Specifically, in the state where the arbitrarily selected channel CHA is in use, when interference occurs when other channels having frequencies close to the frequency of the selected channel CHA are 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 determined in advance by, for example, testing from the microphone 10 and measuring.

  In this embodiment, it has been confirmed that the critical region where interference occurs, that is, the boundary between the region where interference occurs and the region where interference does not occur, is between 0.250 MHz and 0.375 MHz from the selected channel CHA. Therefore, a channel belonging to a frequency band separated from at least 0.375 MHz from the frequency of the arbitrarily selected selected channel CHA does not interfere with the selected channel CHA.

  Therefore, the interference channel CHC that interferes with the external use channel CHB is set as follows. The frequency of the channel set as the external use channel CHB is set as the reference frequency, the frequency lower than the reference frequency by 0.375 MHz (first decrement frequency) is set as the first frequency, and the frequency is 0.375 MHz (second incremental frequency) from the reference frequency. ) The second frequency between the large frequencies. Then, all channels corresponding to the frequency band between the first frequency and the second frequency are set as the interference channel CHC.

  A “configurable channel search process” for searching for a channel that is less likely to cause interference from a plurality of reception channels will be described. This process is executed when the search start button 45 is pressed.

With reference to FIG. 6, the procedure of “configurable channel search processing” will be described.
In step S110, it is determined whether or not 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 executed. When it is determined that the search start button 45 has not been pressed, the “configurable channel search process” ends.

  Next, in step S120, an “external channel determination process” for determining whether or not a signal from an external device other than the wireless microphone system 1 is received is executed. “External channel determination processing” is performed in order from the channel with the lowest frequency.

  Specifically, the reception channel CHY with the lowest frequency is associated with number 1, a predetermined integer is associated with the channel with the lowest frequency, and the channel with the highest frequency is associated with the largest integer (parameter Nmax). Then, an operation of sequentially incrementing the parameter N from 1 to Nmax is performed (step S140), and “externally used channel determination process” is performed on the reception channel CHY having the same integer as the parameter N. When the parameter exceeds Nmax (step S130), the process proceeds to the next step. As a result, the “externally used channel determination process” is performed for all the reception channels CHY. Hereinafter, executing “external channel determination processing” in order from the channel with the lowest frequency is referred to as “channel scan”.

  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 for each channel in order from the same channel. Then, through this process, it is checked for each channel whether or not a signal from an external device other than the wireless microphone system 1 is received. When it is determined that the signal from the external device is received, the channel is set to be the external use channel CHB.

  In step S150, based on the channel scan result, the interference channel CHC is set by the interference channel setting method. Then, the configurable channel CHD is extracted from all channels by excluding the external use channel CHB and the interference channel CHC.

  In step S160, the number of configurable channels CHD is calculated for each group. Further, out of each group, a group having the largest number of configurable channels CHD (hereinafter, “configurable maximum group GRZ”) is extracted.

  In step S170, the settable channel CHD having the smallest number among the settable maximum group GRZ extracted in step S160 is set as the reception channel CHY of the wireless receiver 30. The settable channel CHD is displayed on the result display unit 46.

  The user who sets the channel of the wireless microphone system 1 can set the group and channel of the microphone 10 with reference to the number displayed on the result display unit 46.

  That is, when setting the channel, the user (1) presses the search start button 45, and (2) sets the channel of the microphone 10 based on the number displayed on the result display unit 46 thereafter. With only two operations, it is possible to set a channel that is less likely to cause interference.

  With reference to FIG. 7, the procedure of the “externally used channel determination process” will be described. The “externally used channel determination process” is executed in order for each channel. The procedure of “externally used channel determination process” for the channel corresponding to parameter N (hereinafter “N channel”) will be described below.

  In step S210, the N channel receiving unit 50 is set to the receiving state. Next, in step S220, measurement of time X is started. In step S230, it is determined whether the signal level of the receiving unit 50 is higher than the determination value. The determination value is set to the same level as the maximum value that does not cause interference 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 higher than the determination value, the N channel is set as the external use channel CHB in step S240.

  In step S230, when the signal level of the receiving unit 50 is equal to or less than the determination value, it is determined in step S250 whether or not the time X is greater than the determination time. That is, it is determined whether or not the signal level of the receiving unit 50 is higher than the determination value until the determination time elapses. When the time X exceeds the determination time, the N channel of the receiving unit 50 is set as an unused channel CHE in step S260.

  The extraction of the configurable channel CHD will be described with reference to FIG. In the following, extraction of the configurable channel CHD will be described by taking as an example a case where each channel is classified into 6 groups and each group is composed of 5 channels. First, the channel configuration of the wireless receiver 30 will be specifically described.

  The channel map shown in FIG. 8 shows a group to which the reception channel CHY belongs and a channel number in the group. In the group column of the group column, a code in which a group to which a channel belongs and a channel number are combined is described. For example, a channel corresponding to a frequency of 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.

  In the permutation in which the reception channels CHY are arranged in ascending order of frequency, the channels adjacent to each other are assigned so as to have different groups. 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 the channel belongs to the D group.

  In the same group, adjacent channels are set to be separated by 0.750 MHz. 0.750 MHz corresponds to twice the frequency width that is considered not to interfere with each other in the wireless standard to which the wireless microphone system 1 complies. For this reason, if the wireless microphone system 1 is used in an environment where there is no external use channel CHB, when the channel to be used is set in the same group, no interference occurs between the set channels.

  Further, 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. 0.375 MHz coincides with a frequency width that is considered not to interfere with each other in the wireless standard that the wireless microphone system 1 complies with. For this reason, if the wireless microphone system 1 is used in an environment where there is no external use channel CHB, when the channels to be used are set within the A group and the B group, no interference occurs between the set channels. In such a setting, since two groups are used, a maximum of 10 channels can be used. Further, both the relationship between the C group and the D group and the relationship between the E group and the F group are set similarly to the relationship between the A group and the B group.

  A process until the configurable channel CHD is extracted will be described. Note that the channel map of FIG. 8 shows a state when the processing from step S110 to step S160 is executed.

  The column of the external use channel CHB indicates whether each reception channel CHY is an external use channel CHB. FIG. 8 shows that there are four external use channels CHB. In the column of the interference channel CHC, the external use channel CHB and the channel that may cause interference are shown.

  In the example shown in FIG. 8, based on the setting method of the interference channel CHC, the front three channels and the rear three channels of the external use channel CHB are set as the interference channel CHC, and a total of 14 channels are interference channels. It is set to CHC.

  The channels set as the external use channel CHB and the interference channel CHC are channels that cannot be set (hereinafter referred to as “unsettable channel CHF”). The channel in the dot area of the group column becomes the non-configurable channel CHF. Accordingly, channels other than the dot area in the group column are settable channels CHD.

  After the settable channel CHD is set in this way, the number of settable channels CHD is counted for each group. The number of settable channels CHD of each group is shown in the settable channel count row. Furthermore, among the groups, the settable maximum 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 maximum group GRZ. Then, “1” having the smallest channel number among “F group” and the settable channel CHD of the F group is displayed on the result display unit 46 as the settable channel CHD.

According to this embodiment, the following effects can be obtained.
(1) In the present embodiment, the plurality of reception channels CHY are divided into a plurality of groups, and each group is a combination of reception channels CHY in which interference does not occur due to use within the same group. Further, one group is selected as a selection group from a plurality of groups, and among the reception channels CHY in this selection group, each reception channel CHY other than the external use channel CHB and the interference channel CHC is extracted as a configurable channel CHD. The

  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 CHY. In this regard, according to the above configuration, a group is a combination of reception channels CHY in which interference does not occur due to use within the same group. In addition, in the same group, since the reception channel CHY other than the external use channel CHB and the interference channel CHC is set as the configurable channel CHD, 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.

  (2) In the present embodiment, the number of configurable channels CHD is obtained for each group. The group having the largest number is selected as the settable maximum group GRZ, and this settable maximum group GRZ is set as the selected group. Of the reception channels CHY in the selected group, the reception channels CHY other than the external use channel CHB and the interference channel CHC are set as the configurable channels CHD.

  According to this configuration, since the reception channels CHY that do not interfere with each other in the settable maximum group GRZ are set as the settable channels CHD, the number of channels that can be used by the user can be increased.

  (3) In the present embodiment, a reception channel having a frequency between the first frequency and the second frequency is extracted as an 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 including the frequency (external frequency) corresponding to the external use channel CHB. The frequency is far away from the frequency side. The second frequency is a frequency farthest away from the frequency corresponding to the external use channel CHB (external frequency).

  According to this configuration, since frequencies belonging to bands that interfere with each other when channels are set correspond to the interference channel CHC and are excluded from the configurable channel CHD, interference between channels is more reliably suppressed. be able to.

  (4) In this embodiment, a signal level is acquired for each of the plurality of reception channels CHY, each of the reception channels CHY is compared with a determination value, and when the signal level is greater than the determination value, the reception channel CHY is external The channel used is CHB.

  According to this configuration, by comparing the signal level with the determination value, it is determined whether or not there is an external use 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 that may cause interference.

  (5) In the present embodiment, a result display unit 46 (display device) that displays the settable channel CHD is provided. According to this configuration, the settable channel CHD can be indicated to the user of the wireless receiver 30 by the result display unit 46, so that the user sees the settable channel CHD displayed on the result display unit 46, Channels can be set easily.

  (6) In the present embodiment, the wireless microphone system 1 includes the wireless receiver 30 configured as described above and the microphone 10 configured as described above. According to this configuration, since the settable channel CHD is shown in the wireless receiver 30, 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 do.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIG.
The wireless microphone system 1 of the present embodiment is obtained by adding the following changes to the configuration of the first embodiment. That is, in the first embodiment, an example in which the present invention is applied to the wireless microphone system 1 that converts an audio signal into a digital signal has been described. On the other hand, in the present embodiment, the present invention is applied to the wireless microphone system 1 that converts an audio signal into an analog signal. Hereinafter, a detailed change from the configuration of the first embodiment that occurs with this change will be described. In addition, about the structure which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The wireless microphone system 1, the microphone 10, and the wireless receiver 30 have the same configuration as that of 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, the relationship between channels in which interference occurs differs between when the digital transmission signal is received. For this reason, in the analog wireless microphone system 1, “externally used channel determination process” different from that of the digital wireless microphone system 1 is performed.

With reference to FIG. 9, the procedure of the “configurable channel search process” of this embodiment will be described.
In step S310, it is determined whether or not 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 S320 is executed. When it is determined that the search start button 45 has not been pressed, the “configurable channel search process” ends.

  In step S320, an “external 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 is received. The “externally used channel determination process” is performed in order from the channel with the lowest frequency.

  In step S350, a channel (hereinafter referred to as “third-order interference channel CHG”) that is affected by the mutual third-order modulation distortion of the external use channel CHB is calculated. For the third-order interference channel CHG, an interference map may be created by calculating or measuring each reception channel CHY in advance, and this interference map may be referred to.

In step S360, the configurable channel CHD is extracted by excluding the external use channel CHB and the tertiary interference channel CHG from all channels.
In step S370, the number of configurable channels CHD in each group is calculated. Further, the group having the largest settable channel CHD is extracted from each group.

  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 in the group is displayed on the channel display unit 44B.

According to this embodiment, in addition to the effects (1) to (6) according to the first embodiment, the following effects can be achieved.
(7) In this embodiment, a channel having a frequency affected by the mutual third-order modulation distortion of the frequency corresponding to the external use channel CHB is extracted as the interference channel CHC. According to this configuration, compared with a channel having a frequency that has an influence of mutual third-order modulation distortion of a frequency corresponding to the external use channel CHB, compared with a channel that is not set as an interference channel CHC, the user of the wireless receiver 30 can It is possible to more reliably indicate a reception channel CHY in which no interference occurs.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIG.
The wireless microphone system 1 of the present embodiment is obtained by adding the following changes to the configuration of the first embodiment. That is, in the first embodiment, the configurable channel CHD is extracted for each group by applying the present invention to those in which each channel is classified into six groups. On the other hand, in this embodiment, the configurable channel CHD is extracted regardless of the group. Hereinafter, a detailed change from the configuration of the first embodiment that occurs with this change will be described. In addition, about the structure which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In the process of extracting the configurable channel CHD, the process up to searching for the external use channel CHB and the interference channel CHC is the same as in the first embodiment. Of all the channels, channels other than the externally used channel CHB and the interference channel CHC are channels that can be used (unused channel CHE). However, when channels are set in ascending order of frequency, interference occurs between adjacent channels.

  In this regard, in the first embodiment, channels form a group in which interference does not occur, and channels are set within the same group. That is, the settable maximum group GRZ is extracted, and the reception channel CHY in the settable maximum group GRZ is set as the settable channel CHD.

  On the other hand, in this embodiment, in a group constituted by channels other than the externally used channel CHB and the interference channel CHC (unused channel CHE) among all channels, the channels do not interfere with each other regardless of the group. The receiving channel CHY is selected. Therefore, the reception channel CHY is selected from the above group so as to be separated from 0.375 MHz, which is a frequency width that does not interfere with each other in the standard applied by the wireless microphone system 1. A plurality of combinations of configurable channels CHD extracted by such rule selection are conceivable. Some of these are shown in FIG.

  The X column in the combination column is an example of a combination of configurable channels CHD extracted based on the above rules in a plurality of unused channels CHE. In this case, since the interval between adjacent channels needs to be separated by at least 0.375 MHz, the number of settable channels CHD is four. The number in the X column indicates an identification number assigned in the combination group formed by the extracted configurable channel CHD.

  The Y column in the combination column is another example of combinations 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.

  The Z column in the combination column is another example of combinations of configurable channels CHD extracted based on the above rules. In this case, the number of settable channels CHD is three, unlike the case of the X column described above.

  In this way, the number of settable channels CHD is calculated for each combination, and the combination having the largest number of settable channels CHD (the settable maximum group GRZ) is extracted from these combinations. In FIG. 10, a combination of X columns and a combination of Y columns are extracted.

  When a plurality of combinations are extracted, an average value of signal levels is obtained for each combination, and an average value of signal levels for each combination is compared. Then, the combination with the lowest average signal level is selected. In FIG. 10, Q2 is the smallest value among Q1 to Q3 as the average value of the signal level. In such a case, the combination of column Y is selected as the settable maximum group GRZ. Then, the reception channel CHY having the smallest number among the reception channels CHY belonging to this combination, that is, the channel number corresponding to 806.125 MHz is displayed on the result display unit 46.

According to this embodiment, in addition to the effects (2) to (6) according to the first embodiment, the following effects can be achieved.
(8) In the present embodiment, a plurality of combinations are extracted from a group constituted by unused channels CHE. This combination does not interfere with each other when a plurality of unused channels CHE are used in the same combination. Then, one of the extracted combinations is selected, and the reception channel CHY belonging to the selected combination is set as a configurable channel CHD.

  According to this configuration, combinations that do not interfere with each other are extracted from the unused channels CHE, and the unused channels CHE belonging to this combination are set as the configurable channels CHD. For this reason, interference between the configurable channels CHD can be suppressed.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIG.
The wireless microphone system 1 of the present embodiment is obtained by adding the following changes to the configuration of the first embodiment. That is, in the first embodiment, among the groups, the group having the largest number of configurable channels CHD is selected as the configurable maximum group GRZ. On the other hand, in the present embodiment, when there are a plurality of settable maximum groups GRZ, the average value of the signal level of the externally used channel CHB is compared for each group, and the group with the lowest average signal level is displayed in the result display unit 46. It is selected as the settable maximum group GRZ to be displayed. Hereinafter, a detailed change from the configuration of the first embodiment that occurs with this change will be described. In addition, about the structure which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

With reference to FIG. 11, the procedure of “configurable channel search processing” of the present embodiment will be described.
The processes from step S410 to step S460 are the same as the processes from step S110 to S160 of the “configurable channel search process” of the first embodiment. Next, in step S470, it is determined whether a plurality of settable maximum groups GRZ are extracted. When the result in Step S470 is negative, the settable maximum group GRZ is displayed on the result display unit 46 in Step S490.

  On the other hand, when an affirmative determination is made in step S470, the average signal level of the externally used channel CHB belonging to the group is compared for each group that is set as the maximum settable group GRZ in step S480, and the settable maximum number having the lowest average signal level. Select group GRZ. In step S490, the settable maximum group GRZ and the settable channel CHD having the smallest channel number in this group are displayed on the result display unit 46.

According to this embodiment, in addition to the effects (1) to (5) according to the first embodiment, the following effects can be further achieved.
(9) In the present embodiment, the average value (average signal level) of the signal level 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 of the settable maximum group GRZ The group with the smallest average value of is extracted. Then, among the reception channels CHY in this group, the reception channels CHY other than the external use channel CHB and the interference channel CHC are extracted as the configurable channels CHD.

  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 value of the signal level is the selected group. It is said. Then, each receiving channel CHY other than the selected group, the externally used channel CHB, and the interference channel CHC is set as a configurable channel CHD. For this reason, it is possible to show the user the group that is least prone to interference.

(Other embodiments)
In addition, the embodiment of the present invention is not limited to the embodiment exemplified in each of the above-described embodiments, and can be implemented by changing it as shown below, for example. The following modifications are not applied only to the above embodiments, and different modifications can be combined with each other.

  In the first embodiment, the interval between the minimum value of the interference channel CHC range and the reference frequency and the interval between the maximum value of the interference channel CHC range and the reference frequency are set to the same value. Different values may be used. That is, the absolute value of the first decrement frequency may be different from the absolute value of the second increment frequency.

  In the first embodiment, whether or not the channel is the external use channel CHB is determined based on the signal level. However, the parameter for determining this is not limited to the signal level. For example, the C / N ratio can be used as a determination parameter.

  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 configurable channel CHD is extracted. However, such grouping is not performed, and among all the reception channels CHY, the reception channels CHY other than the external use channel CHB and the interference channel CHC can be set as the configurable channels CHD.

  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 the reception channel CHY that is less likely to cause interference. can do. Note that it is preferable to apply this setting when there is no interference even if channels adjacent to each other are used in the channel order in which the frequencies are arranged in ascending order.

  In the first embodiment, in step S170, the settable channel CHD having the smallest number in the settable maximum group GRZ is set as the reception channel CHY. On the other hand, the user may select the channel to be actually set by processing as follows.

  That is, in step S170, the settable maximum group GRZ extracted in step S160 and the settable channel CHD having the smallest number in the group are displayed on the result display unit 46. At this time, the settable channel CHD is not set in the reception system 3. And it will be in the standby state which makes a user select any channel of the setting possible channel CHD. That is, in the standby state, if the display button 47 is pressed, the settable channel CHD in the settable maximum group GRZ is displayed on the result display unit 46 in order. The settable channel CHD can be selected by pressing the second reception setting unit 44. As a result, 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.

  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 the microphone 10 Set groups and channels. In the case of such a configuration, when interference occurs due to generation of jamming and the user changes the channel of the microphone 10, the wireless receiver 30 is approached to confirm the display on the result display unit 46. Channel must be set. Therefore, a configuration may be adopted in which a short-range wireless device such as Bluetooth is provided in the wireless receiver 30 and the microphone 10 and information on the settable channel CHD extracted first is transmitted and displayed on the microphone 10. According to such a configuration, the settable channel CHD displayed on the microphone 10 can be referred to, so that the channel can be changed without the user approaching the wireless receiver 30.

  In the second embodiment, the configuration in which the channel that is affected by the mutual third-order modulation distortion of the external use channel CHB is excluded from the channel CHD that can be set as the third-order interference channel CHG is applied to the wireless receiver 30 that supports analog signals. Applicable. Such a configuration can also be applied to the digital-compatible wireless receiver 30.

  In the third embodiment, combinations of configurable channels CHD are extracted so that interference does not occur between channels regardless of the group. As a condition for determining this combination, the reception channel CHY is selected so that the selected settable channels CHD are separated from each other by an interval of a frequency of 0.375 MHz so as not to interfere with each other. Alternatively, the frequency spacing between channels can be made larger or smaller than 0.375 MHz. For example, when the radio wave intensity from the microphone 10 is small, the frequency interval between the settable channels CHD can be made smaller than 0.375 MHz.

  In the fourth embodiment, when a plurality of settable maximum groups GRZ are extracted after the “settable channel search process”, the average of the signal levels is compared between the received channels of the group with the lowest signal level. CHY is displayed on the result display unit 46. On the other hand, the reception channel CHY of the group having the smallest average value of the S / N ratio can be displayed on the result display unit 46.

  In the second to fourth embodiments, the settable channel CHD, which is the search result of the “settable channel search process”, is displayed on the result display unit 46. However, this may be output by voice.

  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 ... transmitting 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 section 45 ... Search start button 46 ... Result display section 47 ... Display button 50 ... Reception section 51 ... Demodulator 52 ... Signal processing circuit 53 ... D / A conversion circuit 54 ... Calculation unit, 55... Storage unit.

Claims (7)

In a wireless receiver having a plurality of reception channels and receiving a transmission signal from a microphone having a plurality of transmission channels,
Extract external use channels used by external devices,
Extract interference channels that may interfere with the external use channel,
A wireless receiver characterized in that, among the plurality of reception channels, each reception channel other than the external use channel and the interference channel is extracted as a settable channel. The wireless receiver of claim 1, wherein
The plurality of receiving channels are divided into a plurality of groups,
Each of the groups is a combination of the receiving channels that does not cause interference due to use within the same group,
One of the plurality of groups is a selected group,
Of the reception channels in the selected group, each reception channel other than the external use channel and the interference channel is a settable channel. The wireless receiver of claim 2, wherein
The number of the settable channels is obtained for each group, the group having the largest number is selected as the settable maximum group, and the settable maximum group is set as the selected group. The wireless receiver according to claim 3, wherein
An average value of the signal level of the external use channel is obtained for each of the groups,
When there are a plurality of settable maximum groups, a group having the smallest average signal level is extracted from the settable maximum groups, and this group is set as the selected group. In the wireless receiver as described in any one of Claims 1-4,
Before and after including the external frequency corresponding to the external use channel, when two or more channels are used, the frequency farthest away from the external frequency in the range where the channels interfere with each other is defined as the first frequency, The frequency that is farthest from the external frequency to the highest frequency is the second frequency.
The wireless receiver, wherein the reception channel having a frequency between the first frequency and the second frequency is extracted as the interference channel. In the wireless receiver as described in any one of Claims 1-5,
A wireless receiver, wherein a channel corresponding to a frequency affected by mutual third-order modulation distortion of a frequency of the external use channel is extracted as the interference channel.   A wireless microphone system comprising the wireless receiver according to any one of claims 1 to 6 and a microphone.

Images