JP2001127709A - Wireless transmitter receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless transmitter receiver which can transmit and receive wireless signals normally while preventing the wireless signals from interferring with each other. SOLUTION: When an infrared-ray signal reception part 31 receives a wireless signal sent from a wireless transmitter, a wireless receiver 3 generates a control signal for making and breaking a relay contact 34 by a control circuit 32 according to the wireless signal received by the reception part 31. The reception part 31 comprises an infrared-ray signal receiving circuit 31a which receives the wireless signal and a band-pass filter circuit 31b which passes only a specific frequency component in the signal received by the receiving circuit 31a and outputs it as a transmit signal to the control circuit 32. Here, the control circuit 32 outputs a switching signal to the band-pass filter circuit 31b according to the operation of a reception frequency changeover switch 36 to vary the center frequency of the band-pass filter circuit 31b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a wireless transmitting / receiving apparatus for transmitting / receiving a signal using a wireless signal composed of an optical signal such as an infrared ray.

[0002]

2. Description of the Related Art As this kind of wireless transmission / reception device, a remote control device operates a home appliance by transmitting a wireless signal composed of an optical signal such as infrared light between a home appliance such as a lighting fixture or a TV and a remote control device. The sub-carrier frequency of the wireless signal is about 36.7 kHz, which is recommended by the Japan Home Appliances Association.
Was set to the frequency.

[0003]

In recent years, inverter-type lighting fixtures have rapidly become widespread, and infrared rays emitted from these lighting fixtures interfere with wireless signals used by a wireless transmission / reception device, so that remote control operations of home appliances can be performed. In some cases, it could not be performed normally.

In addition, since a wireless signal used by a wireless transmitting / receiving apparatus may interfere with infrared rays emitted from an inverter-type lighting device, a wireless receiver for receiving a wireless signal cannot be installed near the lighting device. However, there is also a problem that the installation place of the wireless receiver is limited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a wireless transmission / reception apparatus which can prevent wireless signal interference and transmit / receive wireless signals normally. To provide.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a wireless transmitter for transmitting a wireless signal comprising an optical signal and a wireless signal transmitted from the wireless transmitter are received. A wireless receiver, and a transmission frequency variable means for changing a subcarrier frequency of a wireless signal transmitted from the wireless transmitter is provided in the wireless transmitter, and a subcarrier frequency of a wireless signal receivable by the wireless receiver is changed. The wireless receiver and the wireless receiver are characterized in that the wireless receiver and the wireless receiver have transmission frequency variable means for changing the subcarrier frequency of the wireless signal transmitted and received between them. Since the receiving frequency variable means is provided, the subcarrier frequency of the wireless signal is By changing the number, it is possible to prevent interference between the wireless signal and a noise signal such as infrared light emitted from an inverter-type lighting device, and to allow signal transmission between the wireless transmitter and the wireless receiver normally. This can be performed, and interference between a wireless signal and a noise signal radiated from another device can be prevented, so that the degree of freedom of the installation location of the wireless receiver is improved.

According to a second aspect of the present invention, there is provided a wireless transmitter for transmitting a wireless signal comprising an optical signal, and a wireless receiver for receiving a wireless signal transmitted from the wireless transmitter, wherein the wireless transmitter has a subcarrier frequency. A plurality of different wireless signals transmitted from the wireless transmitter, and a receiving frequency variable means for selectively switching a sub-carrier frequency of a receivable wireless signal from a plurality of sub-carrier frequencies of the plurality of wireless signals transmitted from the wireless transmitter. Since the wireless receiver is provided with reception frequency variable means for selectively switching a receivable sub-carrier frequency from sub-carrier frequencies of a plurality of wireless signals transmitted from the wireless transmitter. , A subcarrier of a wireless signal receivable by the reception frequency variable means By switching the wave number,
It is possible to prevent interference between a wireless signal and a noise signal such as infrared light emitted from an inverter-type lighting device, and to perform signal transmission normally between the wireless transmitter and the wireless receiver, and Since the interference between the noise signal radiated from other devices and the wireless signal can be prevented, the degree of freedom of the installation location of the wireless receiver is improved.

According to a third aspect of the present invention, in the first or second aspect, the reception frequency varying means changes the subcarrier frequency of the receivable wireless signal until the wireless signal transmitted from the wireless transmitter can be received. It is characterized in that, when the signal radiated from other devices and the wireless signal interfere with each other and the wireless signal cannot be received, the reception frequency variable means changes the subcarrier frequency that can be received until the wireless signal can be received. Because of the change, the subcarrier frequency of the wireless signal transmitted and received between the wireless transmitter and the wireless receiver can be automatically switched.

According to a fourth aspect of the present invention, in the first to third aspects, each of the frequency variable means changes the subcarrier frequency of the wireless signal to a frequency region which is not affected by disturbance. Each of the frequency variable means changes the subcarrier frequency of the wireless signal to a frequency region not affected by disturbance, so that the wireless signal does not interfere with other signals, and the wireless transmitter and the wireless receiver do not interfere with each other. And signal transmission can be performed normally between them.

According to a fifth aspect of the present invention, in the first to fourth aspects, the wireless signal includes channel data for individually identifying a wireless receiver.
A plurality of subcarrier frequencies of a wireless signal transmitted and received between a wireless transmitter and a wireless receiver are provided, and different channel data is assigned to each wireless signal having a different subcarrier frequency, thereby increasing the number of channels. It is necessary to increase the data length of the channel data, but different channel data is allocated to each wireless signal with a different subcarrier frequency, so the number of channels can be increased without increasing the data length of the channel data. it can.

According to a sixth aspect of the present invention, in the first to fifth aspects, the nonvolatile memory for storing the set value of the subcarrier frequency is provided in at least one of the wireless transmitter and the wireless receiver. Since the setting value of the sub-carrier frequency is stored in the nonvolatile memory, the setting value of the sub-carrier frequency when the power is turned off can be read from the storage content of the nonvolatile memory when the power is turned on again. it can.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wireless transmitting / receiving apparatus according to the present embodiment will be described with reference to FIGS. The wireless transmission / reception device of the present embodiment is for remotely controlling home appliances such as a lighting fixture, a television, a video, and an air conditioner using an infrared signal. FIG. 3 is a schematic diagram of a lighting system to which the wireless transmission / reception device is applied. FIG. This lighting system includes a lighting fixture 1, a wireless transmitter 2 that transmits an operation signal by a wireless signal including an optical signal such as an infrared signal in response to an operation, and an operation signal transmitted by a wireless signal from the wireless transmitter 2. It comprises a wireless receiver 3 which receives and turns on / off the power supply to the lighting equipment 1 according to the operation signal.

FIG. 2 is a block diagram of the wireless transmitter 2. The operation signal is transmitted at a predetermined subcarrier frequency using a plurality of operation switches 21 and a wireless signal composed of an optical signal such as infrared light. An infrared signal transmission circuit 22 and a control circuit 23 composed of, for example, a microcomputer for transmitting an operation signal from the infrared signal transmission circuit 22 as a wireless signal in response to the operation of the operation switch 21
A transmission frequency changeover switch 24 as transmission frequency variable means for selectively switching a subcarrier frequency of a wireless signal transmitted from the infrared signal transmission circuit 22 from a plurality of preset subcarrier frequencies; 2
The power supply circuit 26 supplies operation power to internal circuits such as the control circuit 23 using the power supply 5 as a power supply, and the load to be controlled, that is, the number of the wireless receiver 3 corresponding to the load (hereinafter, this number is referred to as channel data). And a channel setting unit 27 including, for example, a dip switch.

FIG. 1 is a block diagram of the wireless receiver 3. A commercial AC power supply AC is connected between power supply terminals T1 and T2 of the wireless receiver 3, and a lighting fixture 1 is connected between load terminals T3 and T4. Have been. Here, the input terminal T1
And the load terminal T3 are electrically connected, and the input terminal T
Relay contact 3 of the relay 33 between the load terminal 2 and the load terminal T4.
4 is connected, the power supply to the lighting apparatus 1 is turned on / off according to the opening and closing of the relay contact 34. The wireless receiver 3 includes an infrared signal receiving unit 3 that receives an operation signal transmitted as a wireless signal from the wireless transmitter 2.
1 and a control circuit 32 composed of, for example, a microcomputer for generating a control signal for opening and closing the relay contact 34 based on the operation signal received by the infrared signal receiving unit 31
And a relay driving circuit 35 for driving the relay 33 in accordance with a control signal of the control circuit 32, and for selectively switching a subcarrier frequency of a receivable wireless signal from a plurality of preset subcarrier frequencies. A receiving frequency changeover switch 36 serving as a receiving frequency varying unit;
And a power supply circuit 37 for supplying operating power to internal circuits such as the control circuit 32. Although not shown, the wireless receiver 3 is also provided with a channel setting unit such as a dip switch for setting channel data, similarly to the wireless transmitter 2.

Here, the infrared signal receiving section 31 includes an infrared receiving circuit 31a for receiving a wireless signal transmitted from the wireless transmitter 2, and a signal received by the infrared receiving circuit 31a with a subcarrier frequency of the wireless signal as a center frequency. And a band-pass filter circuit 31b which passes only the frequency component of the sub-carrier and outputs it to the control circuit 32 as a transmission signal.
b corresponds to the switching signal input from the control circuit 32,
The center frequency can be selectively switched among a plurality of preset frequencies.

In this lighting system, when the user operates the operation switch 21 of the wireless transmitter 2, the control circuit 23 of the wireless transmitter 2 outputs an operation signal corresponding to the operation content of the operation switch 21 to the infrared signal transmission circuit 22. Then, the infrared signal transmitting circuit 22 transmits the operation signal input from the control circuit 23 to the outside as a wireless signal. The wireless signal transmitted from the wireless transmitter 2 is received by the infrared receiving circuit 31a of the wireless receiver 3, and the band-pass filter circuit 31b is connected to the infrared receiving circuit 3b.
Only the frequency component of the subcarrier frequency included in the wireless signal received by 1a is passed and output to the control circuit 32 as a transmission signal. The control circuit 32 transmits a control signal for opening and closing the relay contact 34 based on the transmission signal input from the bandpass filter circuit 31b to the relay drive circuit 35.
And the relay drive circuit 35 opens and closes the relay contact 34 of the relay 33 to turn on / off the power supply to the lighting fixture 1.

As described above, the wireless transmitter 2 includes a transmission frequency switch 2 for switching the subcarrier frequency of the wireless signal transmitted from the infrared signal transmission circuit 22.
4, the control circuit 23 selects the subcarrier frequency of the wireless signal transmitted from the infrared signal transmission circuit 22 from a plurality of preset frequencies in accordance with the operation of the transmission frequency changeover switch 24. Switching. On the other hand, the wireless receiver 3 is also provided with a reception frequency changeover switch 36 for switching the subcarrier frequency of a receivable wireless signal. When the reception frequency changeover switch 36 is operated, the control circuit 32 transmits a frequency changeover signal. The signal is output to the band-pass filter circuit 31b, and the band-pass filter circuit 31b switches the frequency component to be passed according to the frequency switching signal input from the control circuit 32.

By operating the transmission frequency selector switch 24 and the reception frequency selector switch 36, the subcarrier frequency of the wireless signal can be switched according to the usage environment of the wireless transmitter 2 and the wireless receiver 3. For example, when an inverter-type lighting device or the like is installed near the wireless receiver 3, there is a possibility that infrared light emitted from the lighting device and the wireless signal may interfere with each other. By setting the subcarrier frequency of the wireless signal in a frequency range that is not affected by disturbance, interference between a noise signal radiated from a device such as a lighting fixture and the wireless signal can be avoided, and the wireless transmitter 2 , The remote control operation of the lighting fixture 1 can be normally performed. In addition, by switching the subcarrier frequency of the wireless signal, it is possible to avoid interference between the infrared signal radiated from the inverter-type lighting device 1 and the wireless signal. The wireless receiver 3 can be installed, and the degree of freedom of the installation location of the wireless receiver 3 is improved. Here, at least one of the wireless transmitter 2 and the wireless receiver 3 stores the subcarrier frequency of the wireless signal.
A nonvolatile memory such as an EPROM or a flash memory may be provided. By storing the set value of the sub-carrier frequency in the nonvolatile memory, the control circuits 23 and 32 store the contents of the nonvolatile memory when the power is turned on again. The setting value of the sub-carrier frequency when the power is turned off can be read from.

In the present embodiment, as the subcarrier frequency of the wireless signal, for example, a frequency (about 37.6 kHz) recommended by the Japan Home Appliances Association and infrared rays radiated from an inverter-type lighting fixture or the like. And a frequency in a low frequency region (for example, about 20 kHz) which is hardly affected by the above. Here, the subcarrier frequency of the wireless signal is, for example, about 20 kHz.
If a frequency in the low frequency range of z is used, even if an infrared data communication interface of the IrDA system or the ASK system, which is widely used in personal computers in recent years, is arranged near the wireless receiver 3, wireless signals will not be transmitted. There is no danger of interference with the infrared signal of the present invention.

In the above embodiment, the wireless transmitter 2
The sub-carrier frequency of the wireless signal transmitted from is selectively switched from a plurality of sub-carrier frequencies set in advance using the transmission frequency switch 24,
The sub-carrier frequency of the wireless signal that can be received by the wireless receiver 3 is selectively switched from a plurality of preset sub-carrier frequencies using the reception frequency switch 36. May be changed to an arbitrary frequency.

In this embodiment, the wireless transmitter 2
Is switched to a plurality (for example, two) of sub-carrier frequencies of a wireless signal transmitted from the wireless transmitter 2. However, a plurality of (for example, two) wireless signals having different sub-carrier frequencies may be transmitted from the wireless transmitter 2. In that case, the subcarrier frequency of the wireless signal that can be received by the wireless receiver 3 may be switched.

Further, in this embodiment, the wireless receiver 3 is provided with the reception frequency switch 36 for switching the subcarrier frequency of the receivable wireless signal.
Instead of providing the reception frequency switch 36, the wireless transmitter 2 transmits a plurality (for example, two) of wireless signals having different subcarrier frequencies, and the wireless signal is transmitted until the wireless signal transmitted from the wireless transmitter 2 can be received. The wireless signal that can be received by the receiver 3 may be switched by software. That is, the control circuit 32 of the wireless receiver 3 sets the center frequency of the normal bandpass filter circuit 31b to about 36.7 k.
Hz. Then, when the state in which the infrared signal receiving unit 31 is receiving the signal continues for a certain period of time or longer, the control circuit 32 determines the influence of the optical signal radiated from, for example, a lighting fixture installed near the wireless receiver 3. The center frequency of the band-pass filter circuit 31b is determined to be lower than the frequency in the low frequency region (for example, about 20 kHz).
z) a switching signal for switching to band-pass filter circuit 3
1b, and by switching the center frequency of the band-pass filter circuit 31b to a frequency in a low frequency region,
The subcarrier frequency of the wireless signal can be automatically switched. Note that the wireless transmitter 2 may transmit a plurality of wireless signals having different subcarrier frequencies, or may operate the transmission frequency switch 24 to switch the subcarrier frequency of the wireless signal. good. In the control circuit 32, the subcarrier frequency of the receivable wireless signal is switched in a stepwise manner. However, the subcarrier frequency of the receivable wireless signal is continuously changed until the wireless signal can be received. Is also good.

The wireless signal transmitted from the wireless transmitter 2 includes, in addition to the control data indicating the control contents of the lighting apparatus 1, the number of the lighting apparatus 1 as a load, that is, the wireless receiver 3 is individually identified. When the channel data included in the received wireless signal matches its own channel data, the wireless receiver 3 turns on / off the luminaire 1 based on the control data included in the wireless signal.
Since the light is turned off, the wireless receiver 3 does not malfunction due to a wireless signal transmitted to another load. Here, when the number of the wireless receivers 3 remotely controlled by the wireless transmitter 2 increases, the number of channels of the wireless receiver 3 needs to be increased. The data length was limited, and the number of channels was also limited. In the wireless transmission / reception device of the present embodiment, by operating the transmission frequency switch 24 and the reception frequency switch 36 as described above, the subcarrier frequency of the wireless signal transmitted from the wireless transmitter 2 and the wireless reception The subcarrier frequency of the wireless signal that can be received by the transmitter 3 can be switched to a plurality of channels. Therefore, by assigning different channel data to each wireless signal having a different subcarrier frequency, the channel length can be increased without expanding the data length of the wireless signal. You can increase the number.

FIG. 4 is a schematic block diagram of a remote monitoring and control system to which the wireless transmitting and receiving apparatus of the present embodiment is applied. In this system, a wireless receiver 3 is connected via a wireless signal line 8 to a wireless relay terminal. The control terminal 5 for controlling the lighting apparatus 1 and the wireless relay terminal 6 are connected to a two-wire transmission line 7, and the control terminal 5 and the control terminal 5 are connected via the transmission line 7. The wireless relay terminal 6 is connected to the multiplex transmission master 4.

In such a remote monitoring and control system, a transmission signal Vs having a format as shown in FIG. 5A is transmitted from the multiplex transmission master unit 4 to communicate with each of the terminal units 5 and 6. Send and receive data. That is, the transmission signal Vs is
A start pulse ST indicating the start of signal transmission, mode data MD indicating the mode of the signal, address data AD for individually recognizing the terminals 5 and 6, control data CD indicating the control contents for the lighting equipment 1, transmission errors Is a bipolar (± 24 V) time-division multiplexed signal composed of checksum data CS for detecting a signal and a signal return period WT for setting a return period from the terminals 5 and 6 so that data is transmitted by pulse width modulation. It has become. In each of the terminals 5 and 6, the address data A of the transmission signal Vs received via the transmission line 7 is transmitted.
When the address included in D matches the preset address, the control data CD of the transmission signal Vs is taken in, and the monitoring data is transferred to the current mode signal (transmission mode) in synchronization with the signal return period WT of the transmission signal Vs. The signal is sent back as a short-circuit between the lines 7 via an appropriate low impedance.

On the other hand, the multiplex transmission master unit 4 is provided with a dummy signal transmitting means and an interrupt processing means. The dummy signal transmitting means constantly transmits a transmission signal Vs in which the mode data MD is set to the dummy mode and the address data AD is cyclically changed. Further, the interrupt processing means, when the wireless relay terminal 6 generates an interrupt signal Vi as shown in FIG. 5B in synchronization with the start pulse ST of the transmission signal Vs in the dummy mode, the wireless relay terminal 6 And the address data is returned as the monitoring data together with the operation data. When the operation switch 21 of the wireless transmitter 2 is operated, a wireless signal including address data is transmitted from the wireless transmitter 2, and the wireless relay terminal 6 receives the wireless signal received via the wireless receiver 3. 2 is returned to the multiplex transmission master 4.

When the multiplex transmission master 4 receives the address data from the wireless relay terminal 6 as described above, the multiplex transmission master 4 monitors the control data CD to the control terminal 5 in which the correspondence by the address is set in advance. It is created based on the data and time-division multiplexed via the transmission line 7. That is, the lighting fixture 1 connected to the designated control terminal 5 turns on / off according to the control data CD.

To summarize the above operation, when the operation switch 21 of the wireless transmitter 2 is operated, the wireless transmitter 2 transmits a wireless signal including address data, and the wireless receiver 3 receiving this wireless signal.
Outputs the wireless signal received via the wireless signal line 8 to the wireless relay terminal 6. When the wireless relay terminal 6 receives the signal from the wireless receiver 3, the wireless relay terminal 6 sends an interrupt signal Vi to the transmission line 7, and the multiplex transmission master unit 4, which has received the interrupt signal Vi, sends the transmission signal Vs. First, the wireless relay terminal 6 receives the data for turning on / off the lighting fixture 1 and the address data included in the wireless signal. Multiplex master 4
The control data CD corresponds to the received address data.
Is transmitted, and by transmitting a transmission signal Vs including the address data AD, the control data CD is transmitted to the target control terminal 5 to turn on / off the lighting fixture 1. Can be turned off.

[0029]

As described above, the first aspect of the present invention includes a wireless transmitter for transmitting a wireless signal composed of an optical signal, and a wireless receiver for receiving a wireless signal transmitted from the wireless transmitter. A transmission frequency varying means for changing a subcarrier frequency of a wireless signal transmitted from a wireless transmitter is provided in a wireless transmitter, and a reception frequency varying means for changing a subcarrier frequency of a wireless signal receivable by a wireless receiver is wirelessly provided. The wireless transmitter and the wireless receiver are provided with a transmission frequency variable unit and a reception frequency variable unit for changing a subcarrier frequency of a wireless signal transmitted and received between the wireless transmitter and the wireless receiver. By changing the subcarrier frequency of the wireless signal It is possible to prevent interference between a wireless signal and a noise signal such as infrared light emitted from an inverter-type lighting device, and to have an effect that signal transmission can be performed normally between the wireless transmitter and the wireless receiver, and In addition, since interference between a wireless signal and a noise signal radiated from another device can be prevented, there is also an effect that the degree of freedom of an installation location of the wireless receiver is improved.

According to a second aspect of the present invention, there is provided a wireless transmitter for transmitting a wireless signal comprising an optical signal, and a wireless receiver for receiving a wireless signal transmitted from the wireless transmitter, wherein the wireless transmitter has a subcarrier frequency. A plurality of different wireless signals transmitted from the wireless transmitter, and a receiving frequency variable means for selectively switching a sub-carrier frequency of a receivable wireless signal from a plurality of sub-carrier frequencies of the plurality of wireless signals transmitted from the wireless transmitter. The wireless receiver has the following features:
From the sub-carrier frequencies of the plurality of wireless signals transmitted from the wireless transmitter, the receiving frequency variable means for selectively switching the receivable sub-carrier frequency is provided. By switching the sub-carrier frequency, it is possible to prevent interference between the wireless signal and noise signals such as infrared rays emitted from the inverter-type lighting equipment, and signal transmission between the wireless transmitter and wireless receiver normally. Can be performed, and interference between a wireless signal and a noise signal radiated from another device can be prevented, so that the degree of freedom in installing a wireless receiver can be improved.

According to a third aspect of the present invention, in the first or second aspect, the reception frequency varying means changes the subcarrier frequency of the receivable wireless signal until the wireless signal transmitted from the wireless transmitter can be received. It is characterized in that, when the signal radiated from other devices and the wireless signal interfere with each other and the wireless signal cannot be received, the reception frequency variable means changes the subcarrier frequency that can be received until the wireless signal can be received. Since the subcarrier frequency is changed, the subcarrier frequency of the wireless signal transmitted and received between the wireless transmitter and the wireless receiver can be automatically switched.

According to a fourth aspect of the present invention, in each of the first to third aspects, each of the frequency variable means changes the subcarrier frequency of the wireless signal to a frequency region which is not affected by disturbance. Each of the frequency variable means changes the subcarrier frequency of the wireless signal to a frequency region not affected by disturbance, so that the wireless signal does not interfere with other signals, and the wireless transmitter and the wireless receiver do not interfere with each other. There is an effect that signal transmission can be performed normally between the two.

According to a fifth aspect of the present invention, in the first to fourth aspects of the present invention, the wireless signal includes channel data for individually identifying the wireless receiver, and the wireless signal is transmitted between the wireless transmitter and the wireless receiver. A plurality of sub-carrier frequencies of wireless signals transmitted and received between them are provided, and different channel data is allocated to each wireless signal having a different sub-carrier frequency. When the number of channels increases, the data length of the channel data increases. Although it is necessary, another channel data is allocated to each wireless signal having a different subcarrier frequency, so that the number of channels can be increased without increasing the data length of the channel data.

According to a sixth aspect of the present invention, in the first to fifth aspects, a nonvolatile memory for storing a set value of the subcarrier frequency is provided in at least one of the wireless transmitter and the wireless receiver. Since the setting value of the sub-carrier frequency is stored in the nonvolatile memory, the setting value of the sub-carrier frequency when the power is turned off can be read from the storage content of the nonvolatile memory when the power is turned on again. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a block diagram of a wireless receiver used in a wireless transmission / reception device of the present embodiment.

FIG. 2 is a block diagram of a wireless transmitter used in the embodiment.

FIG. 3 is a schematic configuration diagram of an illumination system using the wireless transmission / reception device according to the first embodiment.

FIG. 4 is a schematic configuration diagram of a remote monitoring and control system using the wireless transmission and reception device according to the first embodiment.

FIGS. 5A and 5B are waveform diagrams of signals used in the remote monitoring control system of the above.

[Explanation of symbols]

 3 Wireless Receiver 31 Infrared Signal Receiving Unit 31a Infrared Receiving Circuit 31b Bandpass Filter Circuit 32 Control Circuit 34 Relay Contact 36 Reception Frequency Switch

Claims (6)

[Claims] A wireless transmitter for transmitting a wireless signal comprising an optical signal; and a wireless receiver for receiving a wireless signal transmitted from the wireless transmitter.
A transmission frequency varying means for changing a subcarrier frequency of a wireless signal transmitted from a wireless transmitter is provided in a wireless transmitter, and a reception frequency varying means for changing a subcarrier frequency of a wireless signal receivable by a wireless receiver is wirelessly provided. A wireless transmission / reception device provided in a receiver. 2. A wireless transmitter for transmitting a wireless signal comprising an optical signal, and a wireless receiver for receiving a wireless signal transmitted from the wireless transmitter,
The wireless transmitter transmits a plurality of wireless signals having different subcarrier frequencies, and selectively switches a subcarrier frequency of a receivable wireless signal from a subcarrier frequency of a plurality of wireless signals transmitted from the wireless transmitter. A wireless transmitting and receiving apparatus, wherein the means is provided in a wireless receiver. 3. The wireless communication system according to claim 1, wherein the reception frequency varying means changes the subcarrier frequency of the receivable wireless signal until the wireless signal transmitted from the wireless transmitter can be received. Transceiver. 4. The wireless transmission / reception apparatus according to claim 1, wherein each of said frequency variable means changes a subcarrier frequency of the wireless signal to a frequency range not affected by disturbance. 5. The wireless signal includes channel data for individually identifying a wireless receiver,
A plurality of subcarrier frequencies of a wireless signal transmitted and received between a wireless transmitter and a wireless receiver are provided, and different channel data is assigned to each wireless signal having a different subcarrier frequency. 5. The wireless transmission / reception device according to 4. 6. The wireless transmission / reception apparatus according to claim 1, wherein a nonvolatile memory for storing a set value of the subcarrier frequency is provided in at least one of the wireless transmitter and the wireless receiver. .