Signal transmission system and signal transmission method

Abstract

To provide a signal transmission system and a signal transmission method capable of surely setting a frequency band with less radio wave interference and transmitting a signal from a master unit to a remote slave unit.SOLUTION: The signal transmission system includes a master unit 100, a first slave unit 210 and a second slave unit 220, and transmits a signal output from the master unit 100 to a plurality of slave units including each slave unit 210,220 by predetermined communication, wherein the master unit 100 and each slave unit 210,220 have physical switches (110,211,212,221, 222). A communication frequency band between the master unit 100 and the first slave unit 210 and a communication frequency band between the first slave unit 210 and the second slave unit 220 are set to different communication frequency bands by an ID designation operation via the physical switches (110,211,212,221, 222).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a signal transmission system and a signal transmission method. [Background technology]

[0002] BACKGROUND ART Conventionally, a signal transmission system in which a master unit and a slave unit transmit signals is known (see, for example, Patent Document 1).

[0003] In order to reduce radio wave interference when transmitting an alarm signal, this conventional signal transmission system divides the alarm devices that receive the signal into multiple groups in parallel, with each group using a different channel frequency, making it less likely that radio wave interference will occur between groups. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-14119 Summary of the Invention [Problem to be solved by the invention]

[0005] However, because each group is parallel, for example, when transmitting a signal from a parent device to multiple child devices, there is a limit to the number of child devices that can be connected in order to prevent radio wave interference. Also, while there are known devices that automatically set the frequency band used for transmission, there is a limit to the frequency band that can be selected with parallel connections, and there is a risk of radio wave interference. In addition, when trying to transmit a signal to a remote slave unit, there is a limit to the distance the signal can travel, making it difficult to transmit the signal to a remote slave unit.

[0006] The present disclosure has been made in light of the above-mentioned problems, and aims to provide a signal transmission system and a signal transmission method that can reliably set a frequency band with less radio interference and that enables signals to be transmitted from a parent unit to a child unit that is far away. [Means for solving the problem]

[0007] The signal transmission system of the present disclosure includes a parent unit, a first child unit, and a second child unit, and transmits a signal output from the parent unit to the child units through a predetermined communication. The signal transmission system has a physical switch, and by performing an ID designation operation via the physical switch, the communication frequency band between the parent unit and the first child unit and the communication frequency band between the first child unit and the second child unit are set to different communication frequency bands.

[0008] The signal transmission method of the present disclosure is a signal transmission method including the steps of transmitting the signal between the parent device and the first child device in a predetermined communication frequency band, and transmitting the signal between the first child device and the second child device in a communication frequency band different from the predetermined communication frequency band. [Effects of the Invention]

[0009] The signal transmission system and signal transmission method of the present disclosure can reliably set a frequency band with little radio wave interference, and can transmit a signal from a master unit to a slave unit located far away. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a block diagram showing a signal transmission system according to an embodiment; [Figure 2] 10 is a flowchart showing a flow of processing by a master controller of the signal transmission system according to the embodiment; [Figure 3] 10 is a flowchart showing a flow of processing by each slave unit control unit of the signal transmission system according to the embodiment. [Figure 4] 3 is an explanatory diagram of the correspondence between IDs and channels in the signal transmission system according to the embodiment; FIG. [Figure 5] 10 is a connection state explanation showing an example of setting each ID and channel in an example of a connection state in a signal transmission system of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of a signal transmission system according to the present disclosure will be described with reference to the drawings. 1, the signal transmission system of the embodiment includes a base unit 100, a first handset 210, and a second handset 220, and transmits a signal output from the base unit 100 by predetermined communication. Although not shown in the figure, it is assumed that there is a handset to which signals are transmitted from the second handset 220.

[0012] The master device 100 and each of the slave devices 210 and 220 have physical switches (110, 211, 212, 221, 222). The physical switches are mechanical switches that are switched by physical operation, such as push button switches or dial switches.

[0013] In the signal transmission system of the embodiment, the communication frequency band between the master device 100 and the first slave device 210 and the communication frequency band between the first slave device 210 and the second slave device 220 are set to different communication frequency bands by ID designation operations via the physical switches (110, 211, 212, 221, 222). Note that the communication frequency bands of adjacent slave devices located downstream that communicate with the second slave device 220 are also set to different frequency bands.

[0014] In this way, radio wave interference is unlikely to occur because the communication frequency band between base unit 100 and first handset 210 and the communication frequency band between first handset 210 and second handset 220 are set to different communication frequency bands. Also, downstream of second handset 220, the communication frequency bands between adjacent handset units are different, so radio wave interference is unlikely to occur and signals can be transmitted from base unit 100 to handset units that are far away. In addition, since the communication frequency bands are set by operating each physical switch (110, 211, 212, 221, 222), it is possible to more reliably prevent overlapping of communication frequency bands compared to systems that automatically search for and connect to available channels, thereby more reliably avoiding radio interference.

[0015] The signal transmission system of the embodiment includes a base unit 100, a first handset 210, and a second handset 220, and transmits a signal output from the base unit 100 by predetermined communication.

[0016] The parent device 100 sets an access point for the first child device 210 to connect to based on an ID (e.g., SSID00 shown in Figure 5) by performing an ID designation operation via the parent device physical switch 110, and transmits a signal to the first child device 210 that has accessed based on the ID (e.g., SSID00 shown in Figure 5) in a communication frequency band corresponding to the ID.

[0017] The first slave device 210 is configured such that the ID designated on the signal input side for connecting to the parent device 100 (for example, SSID00 shown in FIG. 5) is different from the ID designated on the signal output side for connecting to the second slave device 220 (for example, SSID01 shown in FIG. 5) by an ID designation operation via the slave device physical switches (211, 212), and the communication frequency band with the parent device 100 and the communication frequency band with the second slave device 220 are different.

[0018] In addition, the second handset 220 is configured such that the ID designated on the signal input side for connecting to the first handset 210 (for example, SSID01 shown in FIG. 5) is different from the ID designated for connecting to other handset devices connected to the second handset 220 (for example, SSID03 shown in FIG. 5) by an ID designation operation via each physical switch (221, 222), and the communication frequency band with the first handset 210 is different from the communication frequency band with other handset devices (for example, the third handset 230 shown in FIG. 5).

[0019] Therefore, as described above, radio wave interference is unlikely to occur, and signals can be transmitted from master unit 100 to slave units that are far away.

[0020] The signal transmission system of the embodiment includes a base unit 100, a first handset 210, and a second handset 220, and transmits a signal output from the base unit 100 by predetermined communication.

[0021] The parent device 100 includes a parent device physical switch 110 and a parent device control unit 120 . The parent device control unit 120 sets an ID (for example, SSID00 shown in FIG. 5 ) associated with a predetermined communication frequency band by an ID designation operation via the parent device physical switch 110, and sets the ID associated with the predetermined communication frequency band set by the parent device physical switch 110 as an access point for the first child device 210 to communicate with and access the parent device 100. Furthermore, the parent device control unit 120 transmits a signal from the signal transmission unit 122 to the first child device 210 that has accessed the parent device 100 in the predetermined frequency band.

[0022] The first slave device 210 has a first slave device physical switch (211, 212) and a first slave device control unit 213, and the first slave device physical switch has a first input side slave device physical switch 211 and a first output side slave device physical switch 212.

[0023] The first slave device control unit 213 searches for and connects to an ID (for example, SSID00 shown in FIG. 5) associated with a predetermined communication frequency band by an ID designation operation via the first input slave device physical switch 211. Also, the first slave device control unit 213 sets an ID (for example, SSID01 shown in FIG. 5) associated with a communication frequency band different from the predetermined communication frequency band by an ID designation operation via the first output slave device physical switch 212. Furthermore, the first slave device control unit 213 sets the ID (for example, SSID01 shown in FIG. 5) associated with the different communication frequency band set by the first output slave device physical switch 212 as an access point for the second slave device 220 to communicate with and access the first slave device 210.

[0024] The first slave device control unit 213 further includes a signal receiving unit 214 and a signal transmitting unit 216. The signal receiving unit 214 receives a signal transmitted from the signal transmitting unit 122 of the master device 100 in the predetermined communication frequency band associated with the ID set by the ID designation operation of the first input side slave device physical switch 211. The signal transmitting unit 216 transmits a signal in the different communication frequency band to the second slave device 220 that has accessed the first slave device 210.

[0025] The second slave device 220 includes a second slave device physical switch (221, 222) and a second slave device control unit 223, and the second slave device physical switch includes a second input side slave device physical switch 221 and a second output side slave device physical switch 222.

[0026] Then, the second handset control unit 223 searches for and connects to an ID (for example, SSID01 shown in Figure 5) associated with the different communication frequency band by an ID designation operation via the second input side handset physical switch 221. Furthermore, an ID (for example, SSID03 shown in FIG. 5) associated with a communication frequency band that is even different from the different communication frequency band is set by an ID designation operation via the second output side slave device physical switch 222, and the ID associated with the even different communication frequency band set by the second output side slave device physical switch 222 is set as an access point for the second slave device 220 to communicate with and access a slave device further downstream (for example, the third slave device 230 shown in FIG. 5).

[0027] The second handset control unit 223 further includes a signal receiving unit 224 and a signal transmitting unit 226. The signal receiving unit 224 receives a signal transmitted from the signal transmitting unit 216 of the first handset 210 in the different communication frequency band associated with the ID set via the second input-side handset physical switch 221. The signal transmitting unit 226 transmits a signal in the further different communication frequency band to a handset that is further downstream and has accessed the second handset 220 (for example, the third handset 230 shown in FIG. 5).

[0028] Therefore, since the communication frequency band used for communication between the base unit 100 and the first handset 210, the communication frequency band used for communication between the first handset 210 and the second handset 220, and the communication frequency band used for communication between the second handset 220 and its downstream handset (for example, the third handset 230 shown in Figure 5) are different, radio wave interference is less likely to occur, and since each handset 210, 220 can be connected in series, it is possible to transmit signals to handset units that are far from the base unit 100.

[0029] Furthermore, the master device 100, the first slave device 210, and the second slave device 220 each have a publishing unit 121, 215, 225 that publishes the ID set as an access point. Therefore, the master device 100 and each slave device 210, 220 can publish their ID as an access point, connect to each slave device, and transmit signals. Therefore, in the signal transmission system of the embodiment, each slave device 210, 220 and slave devices downstream in the communication flow can be independently connected in series, and signals can be transmitted over a wide range and over long distances while suppressing signal interference. Note that publishing means transmitting an ID and making it available for reference by devices searching for the ID.

[0030] 5, in the embodiment, the base unit 100, the first handset 210, the second handset 220, 220b, and the third handset 230, 230b, 230c as downstream handset are connected in series from first to third and are arranged in parallel. The communication frequency band between the base unit 100 and the first handset 210, the communication frequency band between the first handset 210 and the second handset 220, and the communication frequency band between the first handset 210 and the second handset 220b are set differently. The communication frequency band between the second handset 220 and the third handset 230 and the communication frequency band between the second handset 220 and the third handset 230c are set differently from each other and are also set differently from the communication frequency band between the first handset 210 and the second handset 220 located upstream thereof. Similarly, the communication frequency band between the second handset 220b and the third handset 230b is set to be different from the communication frequency band between the first handset 210 and the second handset 220b located upstream thereof.

[0031] The setting of a communication frequency band will be described below. In this embodiment, a communication frequency band during communication is associated with predetermined channel information, and an ID is associated with the communication frequency band via the predetermined channel information. In this embodiment, as shown in FIG. 4, eight types of IDs, each consisting of two digits, 00 to 07, are set as IDs. Four types of channels (CHs), 36, 40, 44, and 48, are set to each ID, and each channel is set to a different frequency band. Therefore, when IDs are set in the order of 00 to 07, channels 36, 40, 44, and 48 are set in a cyclical manner in the order of 36 → 40 → 44 → 48 → 36 → 40 → 44 → 48 → ..., and as a result, the settable communication frequency bands associated with the channels are also set in a cyclical manner. In this embodiment, an example is shown in which the number of digits of the ID is 2, but the number of digits may be other than 2. Also, in this embodiment, an example is shown in which the number of channels and the number of communication frequency bands are 4, but this is not limited to this, and the number of channels and the number of communication frequency bands may be more than 4 or may be less than 4. Therefore, the relationship between the ID and the channel and the communication frequency band is not limited to the relationship shown in the embodiment.

[0032] In addition, in this embodiment, wireless communication is used for the above communication, and in particular, Wi-Fi (registered trademark) is used, but other wireless communication standards may also be used.

[0033] First, the operation and processing for determining each communication frequency band will be described. The parent device physical switch 110, first input side slave device physical switch 211, first output side slave device physical switch 212, second input side slave device physical switch 221, and second output side slave device physical switch 222, which perform the ID designation operation, are, for example, push button switches or dial switches, and by operating these, they can be set to any one of 00 to 07. The operation of setting this two-digit number is the ID designation operation.

[0034] Then, each of the control units 120, 213, and 223 reads the two-digit number input by the ID designation operation and sets the ID. Specifically, in this embodiment, communication is performed using so-called WiFi (registered trademark), and the ID is created by adding the two-digit number input from each of the above-mentioned switches 110, 211, 212, 221, and 222 to the end of an identifier called an SSID ("Service Set Identifier").

[0035] Next, the processing flow of each of the control units 120, 213, and 223 will be specifically described. First, the flow of processing by the base unit control unit 120 will be described with reference to FIG. In the first step S101, the two-digit number set by the ID designation operation of the parent physical switch 110 is read. Here, as mentioned above, there are eight types of numbers input by the ID designation operation, from 00 to 07, but in this embodiment, a rule is imposed that numbers are input in order from upstream to downstream in the series connection, starting from 00. Then, when numbers up to 07 have been input, they are again input by circulating from 00.

[0036] In the next step S102, the publishing unit 121 publishes the ID corresponding to the read two-digit number as an access point on the channel corresponding to the ID. Here, the channel corresponding to the two-digit number is as shown in FIG. 4, and if the read number is 00, the channel is 36 (CH36). The ID is the SSID with the read number added to the end. For example, in the example shown in FIG. 5, if the number input by the parent device physical switch 110 is 00, SSID00 is published on channel 36 (CH36).

[0037] In the next step S103, it is determined whether a slave unit is connected to the access point. If a connection is found, the process proceeds to step S104, where a signal is transmitted to the connection partner, i.e., the first slave unit 210 in the example shown in FIG. 5, in a communication frequency band corresponding to the set channel 36 (CH36) from the signal transmission unit 122. Examples of such signals include audio / music signals, alarm signals, and video signals. That is, an audio output device or a video output device can be connected to the first slave unit 210 to output music, audio, alarms, and videos. Furthermore, such communication from the master unit 100 is continued until a predetermined termination condition is met (step S105). The fulfillment of the termination condition may be, for example, turning off the power, turning on a transmission stop switch (not shown), or receiving a predetermined termination instruction signal.

[0038] Next, the processing executed by the slave device control unit will be described with reference to Fig. 3. Here, Figs. 1 and 5 show the first slave device 210, the second slave devices 220 and 220b, and the third slave devices 230, 230b and 230c, but the names first, second and third are given for convenience to indicate the order from the upstream side to the downstream side of the serial connection. All the slave devices have the same configuration, but differ in that different communication frequency bands are set by ID designation operations of the slave device physical switches 211, 212, 221 and 222, etc. Therefore, the processing flow shown in the flowchart in Fig. 3 is common to all the slave devices including the slave device control units 213 and 223.

[0039] The slave unit control units including the slave unit control units 213 and 223 execute input side processing shown on the left side of the flowchart and output side processing shown on the right side of the flowchart in parallel. First, the input side processing shown on the left side of the flowchart will be explained. In step S201, the number set by the ID designation operation of the input side slave device physical switch is read. Note that this input side slave device physical switch is the first input side slave device physical switch 211 in the first slave device 210, and the second input side slave device physical switch 221 in the second slave device 220. Also, the third slave devices 230, 230b, 230c and their downstream slave devices (not shown) are provided with similar switches, although not shown.

[0040] For example, in the example shown in FIG. 5, the first slave device 210 reads the number 00 (INSW=00) set in the first input side slave device physical switch 211. Furthermore, the second slave device 220 reads the number 01 (INSW=01) set in the second input side slave device physical switch 221. Similarly, the second slave device 220b reads the number 01 (INSW=01), the third slave device 230 reads the number 03 (INSW=03), the third slave device 230b reads the number 02 (INSW=02), and the third slave device 230c reads the number 03 (INSW=03).

[0041] In the next step S202, the first slave device 210 searches for an ID on the input side corresponding to the read number, connects to an access point with a matching ID, and receives a signal. Specifically, in the example shown in Fig. 5, the first slave device 210 searches for SSID00, which is an ID with 00 at the end, because the read number is 00, connects to the access point of the master device 100 that has made this ID public, and receives a signal from the master device 100 in the signal receiving unit 214 (see Fig. 1). Similarly, the second handset 220, 220b searches for SSID01 with an ID suffix of 01, connects to the access point of the first handset 210, and receives a signal. The third handset 230, 230c searches for SSID03 with an ID suffix of 03, connects to the second handset 220, and receives a signal. The third handset 230b searches for SSID02 with an ID suffix of 02, connects to the second handset 220b, and receives a signal. The reception of these signals continues until a termination condition is met (step S203). Examples of the termination condition being met include power-off, termination of signal reception, and reception of a predetermined termination command signal.

[0042] As described above, on the signal input side, each of the slave devices 210, 220, 220b, 230, 230b, and 230c searches for and accesses the ID set by each of the input side physical switches 211 and 221 and an input side physical switch not shown, and performs processing to receive a signal.

[0043] Next, the output side processing shown on the right side of the flowchart will be described. This output-side process is a process for disclosing an access point, and first, in step S211, the two-digit number set by the ID designation operation of each of the output-side slave physical switches 212, 222 and the output-side slave physical switch (not shown) is read. Note that the third slave devices 230, 230b, 230c and their downstream slave devices (not shown) also have output-side slave physical switches, although these are not shown.

[0044] For example, in the example shown in FIG. 5, in the first slave device 210, the first slave device control unit 213 reads the number 01 (OUTSW=01) set in the first output side slave device physical switch 212 (see FIG. 1). Furthermore, in the second slave device 220, the second slave device control unit 223 reads the number 03 (OUTSW=03) set in the second output-side slave device physical switch 222. Similarly, in the second slave device 220b, a slave device control unit (not shown) reads the number 02 (OUTSW=02), in the third slave device 230, a slave device control unit (not shown) reads the number 04 (OUTSW=04), in the third slave device 230b, a slave device control unit (not shown) reads the number 05 (OUTSW=05), and in the third slave device 230c, a slave device control unit (not shown) reads the number 06 (OUTSW=06).

[0045] In the next step S212, each slave device control unit including each slave device control unit 213, 223 sets an output side ID corresponding to the read number and publishes it as an access point on a channel corresponding to the ID. Specifically, in the example shown in Fig. 5, the first slave device 210 publishes SSID01 corresponding to the read number 01 (OUTSW=01) on channel 40 (CH40). Furthermore, the second slave device 220 publishes SSID03 corresponding to the read number 03 (OUTSW=03) on channel 48 (CH48). Similarly, the second slave device 220b publishes SSID02 corresponding to the read number 02 (OUTSW=02) on channel 44 (CH44). Furthermore, the third slave terminal 230 publishes SSID04 corresponding to the read number 04 (OUTSW=04) on channel 36 (CH=36), and the third slave terminal 230b publishes SSID05 corresponding to the read number 05 (OUTSW=05) on channel 40 (CH40). Furthermore, the third slave terminal 230c publishes SSID04 corresponding to the read number 06 (OUTSW=06) on channel 44 (CH=44). The relationship between the last number of the ID and the channel is as shown in FIG. 4.

[0046] In the next step S213, it is determined whether a slave unit is connected to the access point. If a connection is found, the process proceeds to step S214, where the signal received on the input side is transmitted to the connected slave unit. That is, the signal input from the master unit or slave unit connected upstream in the series connection is transmitted to the slave unit connected downstream. This signal transmission is continued until a predetermined termination condition is met (step S205). The termination condition may be met, for example, when the power is turned off, when signal reception is terminated, or when a predetermined termination command signal is received.

[0047] As described above, in the signal transmission system of the embodiment, the communication frequency bands of the multiple slave units 210, 220, 230 connected in series downstream of the master unit 100 are set differently in sequence, and the communication frequency bands that are set differently in sequence are set in a circular manner from the upstream side to the downstream side after all the settable communication frequency bands have been used from the upstream side to the downstream side. Once these communication frequency bands are set in a circular manner, the communication frequency bands that are set differently in sequence are set in a circular manner from the communication frequency band (CH36) set between the master unit 100 and the first slave unit 210.

[0048] The ID designation operation is performed by inputting a two-digit number, and the ID includes the two-digit number.

[0049] 5, the base unit 100, the first handset 210, the second handset 220, and the third handset 230 are connected in series, and the communication frequency band (CH36) between the base unit 100 and the first handset 210, the communication frequency band (CH40) between the first handset 210 and the second handset 220, and the communication frequency band (CH48) between the second handset 220 and the third handset 230 are set to be different from each other. The ID designation operation for setting these communication frequency bands is the input of two-digit numbers 00 to 07, and the two-digit numbers are input in order downstream starting from the input of the two-digit number 00 in the base unit 100, and after using up to number 07, the input of number 00 is returned to and recirculated. When all the settable communication frequency bands have been used, the communication frequency band (CH36) set between the base unit 100 and the first handset 210 is recirculated and set again. During the ID designation operation, the IDs of each serially connected slave unit may be uniformly set in the order of 00 to 07 from upstream to downstream. However, if, for example, the third slave units 230, 230b, and 230c shown in FIG. 5 are placed close to each other and there is a risk of signal interference, in order to avoid this, the input and output side IDs may be set to be different from each other, as shown in FIG. 5, and the IDs may be set arbitrarily.

[0050] In the signal transmission system of the embodiment described above, when signals are transmitted in sequence from the parent device 100 to the first child device 210, from the first child device 210 to the second child device 220, from the second child device 220 to the third child device 230, and further to the child devices downstream, signal transmission can be carried out smoothly with little radio wave interference, and signals can be transmitted smoothly over long distances. In addition, since the communication frequency bands (channels) are set by operating each physical switch 110, 211, 212, 221, 222, it is possible to reliably prevent overlapping of communication frequency bands compared to automatically searching for and connecting to available channels, and it is possible to more reliably avoid radio wave interference, and it can also be configured using a simple control device. Furthermore, because the parent device 100 and each of the child devices 210, 220, 230, etc. are connected in series, the parent device 100 only needs to transmit to the first child device 210 directly connected to the parent device 100. Therefore, even if the number of child devices connected downstream increases, the amount of transmission from the parent device 100 does not increase, and compared to when parent device 100 transmits in parallel to all of the child devices 210, 220, 230, etc., or when child devices downstream of the parent device 100 transmit in parallel to multiple child devices further downstream, the amount of transmission from the parent device 100 and its surrounding child devices can be significantly reduced, and the transmission load can be kept low.

[0051] In this way, multiple slave units including slave units 210, 220, and 230 can be connected in series indefinitely, and although signals are transmitted wirelessly, they can be transmitted over long distances indefinitely, and radio wave interference can be suppressed as described above. This type of signal transmission is also suitable for use in, for example, streaming music or broadcasts along a long road such as a long shopping street. Also, even when performing serial signal transmission in parallel with the above-mentioned serial signal transmission, such as signal transmission from first handset 210 to second handset 220b and third handset 230b, or signal transmission from second handset 220 to third handset 230c, since the communication frequency bands (channels) on the input and output sides are different as described above, signal transmission can be performed smoothly with little radio interference, as well as over long distances. Furthermore, smooth signal transmission can be achieved even when the signal is branched off from the main signal transmission line. For example, when applied to playing music or broadcasts in shopping districts or roads as described above, it is suitable for use in places where rows of shopping districts or roads intersect.

[0052] The signal transmission method using the signal transmission system of the embodiment includes a step of transmitting a signal between the base unit 100 and the first handset 210 in a predetermined communication frequency band (CH36), and a step of transmitting a signal between the first handset 210 and the second handset 220 in a communication frequency band (CH40) different from the predetermined communication frequency band (CH36).

[0053] In addition, in the signal transmission method of the embodiment, The parent device control unit 120 Steps (S101, S102) of setting an ID (SSID00) associated with a predetermined communication frequency band (CH36) in response to an ID designation operation by the parent device physical switch 110 and publishing the ID as an access point; and transmitting a signal in a predetermined communication frequency band (CH36) to the first slave device 210 that has accessed based on the published ID (SSID00) (S104). The first slave unit control unit 210 A step (S202) of searching for an ID (SSID00) associated with a predetermined communication frequency band (CH36) in response to an ID designation operation of the first input side slave device physical switch 211, connecting to the master device 100, and receiving a signal in the predetermined communication frequency band (CH36); Steps (S211, S212) of setting an ID (SSID01) associated with a communication frequency band different from a predetermined communication frequency band (CH36) in response to an ID designation operation of the first output side slave device physical switch 212, and publishing the ID as an access point for the second slave device 220 to communicate with and access the first slave device 210; A step (S214) of transmitting the signal received from the base unit 100 in a different communication frequency band (CH40) to the second handset 220 that has accessed based on the published ID (SSID01); Execute.

[0054] Furthermore, in the signal transmission method of the embodiment, The second handset control unit 223 of the second handset 220 A step (S202) of searching for an ID (SSID01) associated with the different communication frequency band (CH40) in response to an ID designation operation of the second input side slave device physical switch 221, connecting to the first slave device 210, and receiving a signal in the different communication frequency band (CH40); Steps (S211, S212) of setting an ID (SSID03) associated with the different communication frequency band (CH40) and a further different communication frequency band (CH48) in response to an ID designation operation of the second output side slave device physical switch 222, and publishing the ID (SSID03) as an access point for a third slave device 230 further downstream to communicate with the second slave device 220 and access the third slave device 230; a step (S214) of transmitting a signal in the further different communication frequency band (CH48) to a third slave device 230 further downstream that has accessed based on the published ID (SSID03); Execute.

[0055] Therefore, signal transmission can be performed smoothly with less radio wave interference, and signals can be transmitted smoothly over long distances. In addition, since the communication frequency bands (channels) are set by operating each physical switch 110, 211, 212, 221, 222, it is possible to more reliably prevent overlapping of communication frequency bands compared to automatically searching for and connecting to available channels, thereby more reliably avoiding radio interference.

[0056] In addition, in the signal transmission method of the embodiment, when the communication frequency bands (CH) of the multiple slave units 210, 220, 220b, 230, 230b, 230c connected in series downstream of the master unit 100 are set differently in sequence, after all the settable communication frequency bands from the upstream side to the downstream side have been set, the communication frequency band set between the master unit 100 and the first slave unit 210 is recirculated and set.

[0057] Therefore, even when using a limited number of configurable communication frequency bands, handset units that communicate using the same frequency band (CH) can be placed close together, thereby suppressing radio wave interference within the same communication frequency band.

[0058] The embodiments of the present invention have been described above in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes that do not deviate from the gist of the present invention are included in the present invention. For example, in the above embodiment, an example was shown in which the signal transmitting unit of each slave unit sequentially transmits a signal output from the master unit to the slave units downstream, but the signal output from each slave unit may be sequentially transmitted to a slave unit or master unit connected upstream of each slave unit. That is, the signal transmitting method may include a step of transmitting a signal output from each slave unit to a slave unit or master unit connected upstream of each slave unit accessed based on the disclosed ID. This allows, for example, the signal indicating the status of each slave unit to be transmitted to the master unit, and the signal indicating the status of each slave unit can ultimately be transmitted to the master unit directly or indirectly via a slave unit successively upstream. In this case, too, the frequency band for communication with the upstream slave unit differs from the frequency band for communication with the downstream slave unit, thereby reducing the occurrence of radio wave interference. [Explanation of symbols]

[0059] 100 base unit 110 Parent physical switch 120 Parent unit control unit 121 Public Section 122 Signal transmitter 210 First Handset 210 Handset 210 First handset control unit 211 First input side slave device physical switch 212 first output side slave device physical switch 213 First handset control unit 214 Signal receiving unit 215 Public Section 216 Signal transmitter 220 Second Handset 220b Second handset 221 Second input side child device physical switch 222 Second output side child device physical switch 223 Second handset control unit 224 Signal receiving unit 225 Public Section 226 Signal Transmitter 230 Third Handset 230b Third handset 230c Third handset

Claims

1. A signal transmission system including a base unit, a first handset, and a second handset, and transmitting a signal output from the base unit through predetermined communication, It has a physical switch, A signal transmission system characterized in that the communication frequency band between the parent unit and the first child unit and the communication frequency band between the first child unit and the second child unit are set to different communication frequency bands by an ID designation operation via the physical switch.

2. A signal transmission system including a base unit, a first handset, and a second handset, and transmitting a signal output from the base unit through predetermined communication, the master device sets an access point for the first slave device to connect based on the ID through an ID designation operation via a master device physical switch, and transmits the signal to the first slave device that has accessed based on the ID in a communication frequency band corresponding to the ID; the first slave device is configured such that the ID designated on the signal input side for connection to the master device and the ID designated on the signal output side for connection to the second slave device are different from each other by an ID designation operation via a slave device physical switch, and a communication frequency band with the master device and a communication frequency band with the second slave device are different from each other; In the second handset, the ID designated on the signal input side for connection to the first handset is set to be different from the ID designated for connection by another handset connected to the second handset through an ID designation operation via a handset physical switch, and the communication frequency band with the first handset is set to be different from the communication frequency band with the other handset. A signal transmission system comprising:

3. A signal transmission system including a base unit, a first handset, and a second handset, and transmitting a signal output from the base unit through predetermined communication, the parent device includes a parent device physical switch and a parent device control unit; The parent device control unit an ID associated with a predetermined communication frequency band is set by an ID designation operation via the parent device physical switch, and the ID associated with the predetermined communication frequency band set by the parent device physical switch is set as an access point for the first child device to communicate with and access the parent device; Furthermore, a signal transmitting unit transmits the signal in the predetermined frequency band to the first slave unit that has accessed the master unit; the first slave device includes a first slave device physical switch and a first slave device control unit, and the first slave device physical switch includes a first input side slave device physical switch and a first output side slave device physical switch; The first slave unit control unit searching for and connecting to an ID associated with the predetermined communication frequency band by an ID designation operation via the first input-side slave device physical switch; setting the ID associated with a communication frequency band different from the predetermined communication frequency band by an ID designation operation via the first output side slave device physical switch, and further setting the ID associated with the different communication frequency band set by the first output side slave device physical switch as an access point for the second slave device to communicate with and access the first slave device; the first slave unit control unit further includes a signal receiving unit and a signal transmitting unit; the signal receiving unit receives the signal transmitted from the signal transmitting unit of the master device in the predetermined communication frequency band associated with the ID set via the first input-side slave device physical switch, The signal transmission system is characterized in that the signal transmission unit transmits the signal to the first handset and the second handset that has accessed the first handset in the different communication frequency bands.

4. the second slave device includes a second slave device physical switch and a second slave device control unit, and the second slave device physical switch includes a second input side slave device physical switch and a second output side slave device physical switch; The second handset control unit searching for and connecting to an ID associated with the different communication frequency band by an ID designation operation via the second input side slave device physical switch, setting the ID associated with a communication frequency band further different from the different communication frequency band by an ID designation operation via the second output side slave device physical switch, and further setting the ID associated with the further different communication frequency band set by the second output side slave device physical switch as an access point for the second slave device to communicate with and access a slave device further downstream; the second slave unit control unit further includes a signal receiving unit and a signal transmitting unit, the signal receiving unit receives a signal transmitted from the signal transmitting unit of the first slave device in the different communication frequency band associated with the ID set via the second input slave device physical switch; 4. The signal transmission system according to claim 3, wherein the signal transmission unit transmits the signal to the second handset and the further downstream handset that has accessed the second handset in the different communication frequency band.

5. 4. The signal transmission system according to claim 3, wherein the master device, the first slave device, and the second slave device each have a publishing unit that publishes the ID set as the access point.

6. 2. The signal transmission system according to claim 1, wherein the communication frequency band is associated with predetermined channel information, and the ID is associated with the communication frequency band via the predetermined channel information.

7. 2. The signal transmission system according to claim 1, wherein the communication is wireless communication.

8. 2. The signal transmission system according to claim 1, wherein the wireless communication type is WiFi (registered trademark).

9. 5. The signal transmission system according to claim 4, wherein the master unit, the first slave unit, the second slave unit, and the downstream slave unit are connected in series.

10. The signal transmission system according to claim 9 , wherein the signal transmission unit of each of the slave devices is capable of transmitting a signal output from each of the slave devices to the slave device or the master device connected upstream of each of the slave devices.

11. The signal transmission system according to claim 9, wherein the plurality of slave units connected in series downstream of the master unit are set with sequentially different communication frequency bands, and the sequentially differently set communication frequency bands are set in a recirculating manner.

12. 4. The signal transmission system according to claim 3, wherein the ID designation operation is an input of a two-digit number, and the ID includes the two-digit number.

13. A signal transmission method using the signal transmission system according to claim 1, A signal transmission method comprising the steps of: transmitting the signal between the base unit and the first handset in a predetermined communication frequency band; and transmitting the signal between the first handset and the second handset in a communication frequency band different from the predetermined communication frequency band.

14. A signal transmission method by the signal transmission system according to claim 3, The parent device control unit setting the ID associated with a predetermined communication frequency band in response to an ID designation operation by the parent device physical switch, and publishing the ID as an access point; transmitting the signal in the predetermined communication frequency band to the first slave device that has accessed based on the disclosed ID; The first slave unit control unit searching for the ID associated with the predetermined communication frequency band in response to an ID designation operation of the first input side slave device physical switch, connecting to the master device, and receiving the signal in the predetermined communication frequency band; a step of setting the ID associated with a communication frequency band different from the predetermined communication frequency band in response to an ID designation operation of the first output side slave device physical switch, and publishing the ID as an access point for the second slave device to communicate with the first slave device and access the first slave device; transmitting the signal received from the master device to the second slave device that has accessed based on the disclosed ID in the different communication frequency band; A signal transmission method to perform.

15. A signal transmission method according to claim 14 by a signal transmission system according to claim 4, comprising: The second handset control unit searching for the ID associated with the different communication frequency band in response to an ID designation operation of the second input side slave device physical switch, connecting to the first slave device, and receiving the signal in the different communication frequency band; a step of setting the ID associated with the different communication frequency band and a further different communication frequency band in response to an ID designation operation of the second output side slave device physical switch, and publishing the ID as an access point for a slave device further downstream to communicate with the second slave device and access the second slave device; transmitting the signal in the further different communication frequency band to a slave device further downstream that has accessed based on the disclosed ID; A signal transmission method to perform.

16. A signal transmission method as described in claim 15, wherein when the communication frequency bands of multiple slave units connected in series downstream of the master unit are set differently in sequence, after all settable communication frequency bands from the upstream side to the downstream side have been set, the communication frequency band set between the master unit and the first slave unit is recirculated and set.

17. The signal transmission method according to claim 15, further comprising a step of transmitting a signal output from each of the slave devices to the slave device or the master device connected upstream of each of the slave devices accessed based on the published ID.

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