JP2007089106A - Radio relay system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio relay system wherein a transceiver frequency of a radio repeater whose voice speech becomes possible is adjusted automatically when it moves to a distinct zone and the voice speech by radio is enabled between distinct zones. <P>SOLUTION: This radio relay system is provided with the radio repeater, a transmission and reception frequency storage means, a reception frequency automatic setting means, a signal strength determination means, a control timer and a transmission frequency automatic setting means. The radio repeater is provided with receiving means 2u, 2a and 2d which are used for receiving a plurality of radio waves simultaneously or in time sharing, a transmission means, signal detection means 7u, 7a and 7d, an intermittent timer 8, and a control means 9 which sets the transmission means as a transmission state when one of a plurality of the radio waves is detected and intermittently operates the transmission means at the timing of the intermittent timer 8. The control timer controls so that a present receiving state is continued when receiving signal strength is higher than a setting level and automatically changes a receiving frequency when a state that the receiving signal strength is lower than a setting level continued for a fixed time. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wireless relay system used for expanding the communication range of a portable wireless communication device commonly called a portable transceiver.

In recent years, wireless relay systems have been used in various fields as the use of wireless communication terminals expands. In particular, a wireless device called a specific low power wireless device having a narrow communication range is widely used to expand the communication range.
Hereinafter, an example of the above-described conventional wireless repeater will be described with reference to the drawings.

  FIG. 4 is a block diagram of a radio repeater used in a conventional radio relay system. FIG. 5 shows a block diagram of a wireless communication device used in a conventional wireless relay system. FIG. 6 shows an operation diagram of a radio relay system when a plurality of conventional radio communication devices and a plurality of conventional radio repeaters are used.

  In FIG. 4, reference numeral 1 denotes a receiving antenna that captures radio waves radiated into space and converts them into high-frequency signals.

  Reference numeral 2 denotes a receiving means, which is connected to the receiving antenna 1 and receives and outputs only a high-frequency signal having a specific frequency from among countless high-frequency signals converted by the receiving antenna 1. This specific frequency is referred to as a reception frequency fa. The receiving means 2 can receive only radio waves having the frequency fa.

  A demodulator 3 is connected to the output of the receiver 2 and demodulates a high frequency signal of the reception frequency fa obtained by the receiver 2 and converts it into a required signal such as an audio signal.

  A modulation unit 4 is connected to the output of the demodulation unit 3 and converts an audio signal or the like obtained by the demodulation unit 3 into a signal that can be transmitted as a radio wave.

  A relay transmission unit 5 is connected to the output of the modulation unit 4, amplifies the output signal of the modulation unit 4, and supplies the amplified signal to the transmission antenna 6. At this time, the frequency of the high frequency signal output by the relay transmission means 5 is referred to as a transmission frequency fb. The transmission antenna 6 radiates the high frequency signal amplified by the relay transmission means 5 into the space as a radio wave.

  Here, the reception frequency fa and the transmission frequency fb must be different frequencies. This is because if the reception frequency fa and the transmission frequency fb are the same, the radio repeater itself in FIG. 4 receives the radio wave transmitted by the radio repeater in FIG. 4 and the relay operation cannot be performed.

  Reference numeral 7 denotes a signal detection unit, which detects an output signal when the reception unit 2 receives a high-frequency signal having a predetermined specific frequency. The signal detection means 7 outputs a logic level H when a signal is detected and a logic level L when a signal is not detected.

  Reference numeral 11 denotes a power supply terminal for relay transmission means, which supplies power necessary for the relay transmission means 5 to perform a transmission operation. Reference numeral 10 denotes a switch that connects the relay transmission means power supply terminal 11 to the relay transmission means 5. The switch 10 is turned on when the output of the signal detection means 7 outputs a logic level H, that is, when a signal is detected, and turned off when a logic level L is output, that is, when no signal is detected. Operates on. That is, the switch 10 is turned on only when the receiving means 2 receives a high-frequency signal of the specific frequency fa, the power is supplied to the relay transmission means 5, and the relay transmission means 5 enters the transmission operation state.

The operation of the wireless repeater configured as described above will be described below.
First, when the antenna 1 is not receiving a radio wave having the reception frequency fa, the reception unit 2 does not output a high-frequency signal having the reception frequency fa, so the signal detection unit 7 does not detect the signal. Accordingly, since the switch 10 is in the OFF state, the power of the relay transmission means power supply terminal 11 is not supplied to the relay transmission means 5, and the relay transmission means 5 does not perform the transmission operation. That is, the radio wave having the frequency fb is not transmitted.

  Next, when the reception antenna 1 captures a radio wave with the reception frequency fa, the reception unit 2 outputs a high-frequency signal with the reception frequency fa, so that the signal detection unit 7 detects the signal. Accordingly, the output of the signal detection means 7 becomes the logic level H, the switch 10 is turned on, the power of the relay transmission means power supply terminal 11 is supplied to the relay transmission means 5, and the relay transmission means 5 performs the transmission operation. That is, the radio wave having the transmission frequency fb is radiated into the space.

  In this way, only when a radio wave having the reception frequency fa is received by the receiving antenna 1, the radio wave having the reception frequency fa is converted again to the transmission frequency fb and transmitted with a large amount of power. Can be relayed.

Next, the operation of the conventional wireless communication device will be described with reference to FIG.
In FIG. 5, reference numeral 12 denotes a transmission / reception antenna, which functions as a reception antenna when the wireless communication apparatus in FIG. 5 is in a receiving state, captures radio waves radiated into space, and converts them into high-frequency signals. When the wireless communication apparatus in FIG. 5 is in a transmission state, it functions as a transmission antenna, converts a high-frequency signal into a radio wave, and radiates it into space.

  Reference numeral 13 denotes a transmission / reception selector switch, which sets the wireless communication apparatus in FIG. 5 to either the reception state or the transmission state. When the transmission / reception changeover switch 13 is connected to the contact a, the wireless communication device in FIG. 5 is in a transmission state, and when it is connected to the contact b, it is in a reception state. In this conventional example, it is assumed that the transmission / reception selector switch 13 is manually switched.

Reference numeral 16 denotes a microphone that converts a human voice into an electric signal.
A modulation means 15 is connected to the output of the microphone 16 and converts the audio signal converted by the microphone 16 into a signal that can be transmitted as a radio wave.

  Reference numeral 14 denotes a transmission means which is connected to the output of the modulation means 15, converts the sound signal modulated by the modulation means 15 into a frequency that can be transmitted as a radio wave, and has sufficient power necessary to radiate it as a radio wave in the space. Amplify.

  The output of the transmission means 14 is connected to the contact a of the transmission / reception change-over switch 13, and when the transmission / reception change-over switch 13 is connected to the contact a, the transmission / reception antenna 12 wirelessly transmits the high-frequency signal output from the transmission means 14. Converts to radio waves and radiates to space.

  Reference numeral 18 denotes transmission frequency storage means for storing the transmission frequencies f1a, f2a, f3a and f4a transmitted by the transmission means 14, respectively.

  Reference numeral 17 denotes a transmission frequency manual setting means, which is provided between the transmission frequency storage means 18 and the transmission means 14, and selects one frequency from the frequencies stored in the transmission frequency storage means 18 and transmits it as a transmission frequency. Set to means 14. The frequency is set manually.

  When the transmission frequency manual setting means 17 is connected to the contact 1a, the transmission frequency f1a is set. Similarly, when the transmission frequency manual setting means 17 is connected to the contact 2a, 3a or 4a, the transmission frequency is set to f2a, f3a or f4a, respectively.

  A receiving means 19 is connected to the contact b of the transmission / reception selector switch 13. When the transmission / reception changeover switch 13 is connected to the contact b, the receiving means 19 receives and outputs only a high-frequency signal having a specific frequency from among the innumerable high-frequency signals converted by the transmission / reception antenna 12.

  Reference numeral 21 denotes reception frequency storage means for storing the reception frequencies f1b, f2b, f3b, and f4b received by the reception means 19, respectively.

  Reference numeral 20 denotes a reception frequency manual setting means, which is provided between the reception frequency storage means 21 and the reception means 19, and selects one frequency from the frequencies stored in the reception frequency storage means 21, and receives it as the reception frequency. Set to means 19. The frequency is set manually.

  When the reception frequency manual setting means 20 is connected to the contact 1b, the reception frequency f1b is set. Similarly, when the reception frequency manual setting means 20 is connected to the contact 2b, 3b or 4b, the reception frequency is set to f2b, f3b or f4b, respectively.

  The transmission frequency manual setting means 17 and the reception frequency manual setting means 20 are interlocked. When the transmission frequency manual setting means 17 is connected to the contact 1a, the reception frequency manual setting means 20 is also interlocked with the contact 1b. Connected to. Similarly, when the transmission frequency manual setting means 17 is connected to the contacts 2a, 3a or 4a, the reception frequency manual setting means 20 is also connected to the contacts 2b, 3b or 4b in conjunction with each other. That is, the four transmission frequencies and the four reception frequencies form a pair, and any combination of the four pairs of frequencies is manually set.

  A demodulator 22 is connected to the output of the receiver 19 and demodulates one high-frequency signal of the reception frequencies f1b, f2b, f3b or f4b obtained by the receiver 19 and converts it into a required signal such as an audio signal. To do. A speaker 24 converts an electrical audio signal into sound.

  An audio signal amplifying means 23 is connected to the output of the demodulating means 22 and amplifies the audio signal and the like obtained by the demodulating means 22 so as to obtain a sufficiently large sound by the speaker 24. The output of the audio signal amplification means 23 is connected to the speaker 24.

The operation of the wireless communication apparatus configured as described above will be described below.
First, it is assumed that the transmission frequency is set to f1a by the transmission frequency manual setting means 17, and the reception frequency is set to f1b by the reception frequency manual setting means 20 linked to the transmission frequency manual setting means 17.

The transmission / reception selector switch 13 is connected to the b terminal and is in a receiving state.
Here, when the transmission / reception antenna 12 captures the radio wave having the frequency f1b, the reception unit 19 outputs a high-frequency signal having the frequency f1b. The demodulator 22 demodulates the high frequency signal having the reception frequency f1b and converts it into an audio signal. The audio signal demodulated by the demodulating means 22 is amplified by the audio signal amplifying means 23 and reproduced by the speaker 24. Therefore, the audio signal transmitted as the radio wave having the frequency f1b is reproduced as sound from the speaker 24 of the wireless communication device.

  Further, when the transmission / reception antenna 12 captures a radio wave other than the frequency f1b, the reception unit 19 outputs nothing because it is different from the reception frequency f1b set in the reception unit 19. Therefore, the demodulating means 22 does not perform the demodulating operation, and the audio signal amplifying means 23 does not amplify the signal. Accordingly, nothing is reproduced from the speaker 24.

  Next, in order to set the wireless communication device to the transmission state, the transmission / reception selector switch 13 is manually connected to the contact a. Therefore, the transmission / reception antenna 12 is connected to the transmission means 14.

  In this state, the audio signal input from the microphone 16 is converted into a signal in a format that can be transmitted as a radio wave by the modulation means 15. Then, after being converted to a frequency that can be transmitted as a radio wave by the transmission means 14 and amplified to a sufficient power necessary to radiate as a radio wave in the space, the signal is transmitted to the space by the transmission / reception antenna 12 via the transmission / reception changeover switch 13. Radiated as radio waves. At this time, since the transmission frequency manual setting means 17 sets f1a as the transmission frequency, the frequency of the transmitted radio wave is f1a.

  As described above, when the transmission / reception changeover switch 13 is connected to the contact b, the wireless communication device performs a reception operation at the frequency f1b, and when the transmission / reception changeover switch 13 is connected to the contact a, at the frequency f1a. Perform transmission operation. When changing the transmission / reception frequency, a desired frequency pair may be selected by manually switching the transmission frequency manual setting means 17 and the reception frequency manual setting means 20 that are linked to each other.

  The operation when a wireless relay system is constructed by using a plurality of conventional wireless repeaters and conventional wireless communication devices configured as described above will be described with reference to FIG.

  In FIG. 6, 51, 52, 53 and 54 are the conventional wireless repeaters shown in FIG. 5, which are located in four geographically separated areas, the first area, the second area, the third area and the fourth area. Each shall be equipped.

  6 in FIG. 6 is a receiving antenna of the conventional wireless repeater in FIG. 4, and 6 in FIG. 6 is a transmitting antenna of the conventional wireless repeater in FIG. Each of the wireless repeaters 51, 52, 53, and 54 includes a reception antenna 1 and a transmission antenna 6, respectively.

  The reception frequency of the wireless repeater 51 is set to f1a, and the transmission frequency is set to f1b. Similarly, the wireless repeater 52 is set to the reception frequency f2a and the transmission frequency f2b, the wireless repeater 53 is set to the reception frequency f3a and the transmission frequency f3b, and the wireless repeater 54 is set to the reception frequency f4a and the transmission frequency f4b.

  Reference numerals 41, 42, 43, and 44 denote conventional wireless communication devices that are owned and used by people. In the first area where the wireless repeater 51 is installed, there is an owner A1 who has a wireless communication device 41. Similarly, in the second area where the wireless repeater 52 is installed, there is an owner who has a wireless communication device 42. A2, the owner A3 with the wireless communication device 43 is in the third area where the wireless repeater 53 is installed, and the owner A4 with the wireless communication device 44 is in the fourth area where the wireless repeater 54 is installed. Assume that you have each.

  The transmission frequencies of the wireless communication devices 41, 42, 43, and 44 are f1a, f2a, f3a, and f4a, respectively, and the reception frequencies of the wireless communication devices 41, 42, 43, and 44 are f1b, f2b, f3b, and f4b, respectively.

  Reference numeral 60 denotes a conventional wireless communication apparatus, but the owner is B. It is assumed that the transmission frequency and the reception frequency of the wireless communication device 60 are the same as those of the wireless device 41 and are manually set to f1a and f1b, respectively. In addition, the owner B is in the same first area as the owner A1, but is located at a distance and cannot communicate directly with the wireless communication device. To communicate with the owner A1, the wireless repeater It is assumed that there is a positional relationship that must pass through 51.

Here, the owner B in the first area transmits a radio wave of the transmission frequency f1a using the wireless communication device 60 in order to perform a radio call with the owner A1 in the same first area.
Since the radio repeater 51 receives the radio wave of the frequency f1a emitted from the radio communication device 60, the signal is detected by the signal detection means 7 in FIG. 4 and is in a transmission state to transmit the radio wave of the frequency f1b. That is, the radio wave having the frequency f1a transmitted by the wireless communication device 60 is retransmitted at the frequency f1b by the wireless repeater 51. Accordingly, during that time, the owner A1 can receive the radio wave of the transmission frequency f1b of the wireless repeater 51 and listen to the voice of the owner A1.

  Next, when the owner A1 transmits a radio wave having the transmission frequency f1a using the wireless communication device 41 in order to respond to the owner B, the radio repeater 51 receives the radio wave having the frequency f1a and converts the radio wave to the radio wave having the frequency f1b. Convert and resubmit. The owner B can receive the radio wave of the transmission frequency f1b of the wireless repeater 51 and listen to the voice of the owner A1.

  In this way, the owner A1 and the owner B can communicate with each other wirelessly through the wireless repeater 51 even at a distance where direct communication is not possible. The above is the operation when voice communication is performed via the wireless repeater, and even when the owner A1 and the owner B cannot communicate directly, voice communication is possible via the wireless repeater 51. It becomes.

  However, in the above configuration, when the owner B wants to make a radio call with the owner A2 by moving from the first area to the second area, the transmission frequency and the reception frequency of the owner B are f1a and f1b, respectively. Since the transmission frequency and the reception frequency of the wireless repeater 52 installed in the second area are f2b and f2a, respectively, the following problems have been encountered.

(1) In order to communicate, the owner B must manually switch the transmission frequency and reception frequency of the wireless communication device to f2a and f2b, respectively.
(2) To that end, the owner B must always know the transmission / reception frequency of the wireless repeater installed in each area and the area where the owner B is currently located.
(3) Because of this, it takes time until communication is possible, and a quick wireless call cannot be made.
(4) Furthermore, after the owner B moves from the first area to the second area, since there is no communication function between the wireless repeaters, the owner A1 in the first area and the owner B in the second area Cannot call. The same applies to other areas, and calls cannot be made between owners in different areas.

  The present invention solves the above problems, and even when moving to a different area, it is not necessary to manually change the transmission / reception frequency of the wireless communication device, and wireless communication is performed at the transmission / reception frequency of the wireless repeater that enables voice communication. It is an object of the present invention to provide a radio relay system capable of automatically matching the frequency of a machine and performing a radio call between different areas.

In order to solve the above problems, the wireless relay system of the present invention
(1) Receiving means for receiving radio waves of a plurality of predetermined frequencies simultaneously or in a time-division manner, and demodulation for demodulating a necessary signal such as an audio signal from the signal output by the receiving means Means, a modulating means for modulating the signal output by the demodulating means, a transmitting means for transmitting the signal modulated by the modulating means as a radio wave, and the output signals of the receiving means A signal detection means for determining the presence or absence of a radio wave signal of a frequency, an intermittent timer for intermittently operating the transmission means at a predetermined timing, and the radio wave of the plurality of frequencies by the signal detection means. When a signal is detected at any one of the frequencies, the transmission unit is set in a transmission state, and the plurality of wireless power supplies are set by the signal detection unit. A radio repeater either if it is not found in one of the signal and a control means for intermittently operating the transmitting means by the timing of the intermittent timer,
(2) A modulation transmission function and a reception demodulation function for performing wireless communication, the reception frequency storage means for storing a plurality of reception frequencies, and the reception frequencies stored in the reception frequency storage means A reception frequency automatic setting means for automatically switching and setting, a signal strength determination means for determining whether the reception signal strength at the reception frequency is higher or lower than a preset reception signal strength, and the signal strength determination means When it is determined that the received signal strength is higher than the preset received signal strength, the operation of the reception frequency automatic setting means is stopped and the reception operation at the currently received reception frequency is continued, and the signal strength determining means If the state in which the received signal strength is determined to be lower than the preset received signal strength continues for a certain period of time, the above reception frequency automatic setting is performed. A control timer for controlling to automatically switch the reception frequency by starting the stage operation, and a transmission frequency for storing a plurality of transmission frequencies uniquely determined corresponding to each of the plurality of reception frequencies To automatically set one transmission frequency uniquely determined corresponding to the reception frequency as the latest transmission frequency when one reception frequency is set by the storage means and the reception frequency automatic setting means And a radio communication device having automatic transmission frequency setting means.

With the above-described configuration, the wireless relay system of the present invention automatically switches the reception frequency when the signal strength of a radio wave currently being received is lower than a preset signal strength, and has a signal strength capable of communication. The frequency of the radio wave transmitted from the repeater is automatically set as the reception frequency of the wireless communication device, and the transmission frequency of the wireless communication device is also automatically set in conjunction with it, and the wireless repeater is set from the wireless repeater in the adjacent area. In order to perform relay operation of transmitted radio waves at the same time,
(1) A call can be made even if the owners of wireless communication devices are in different areas.
(2) Even if moving between areas, it is not necessary to manually change the transmission frequency and reception frequency of the wireless communication device during call communication.
(3) Therefore, there is no need to be aware of the transmission / reception frequency of the wireless repeater installed in each area and the area where the owner of the wireless communication device is currently located.
(4) Therefore, communication can be performed immediately, and prompt wireless communication can be performed.
(5) Furthermore, as long as the accumulation of signal deterioration due to the relay operation of the wireless repeater is not affected, the callable range can be expanded without limitation.

Embodiments according to the present invention will be described below with reference to the drawings.
In addition, the same code | symbol is attached | subjected about the same component.

  FIG. 1 is a block diagram of a wireless repeater used in the wireless relay system according to the embodiment of the present invention. FIG. 2 is a block diagram of a wireless communication device used in the wireless relay system according to the embodiment of the present invention. FIG. 3 shows an operation diagram of a wireless relay system when a plurality of wireless communication apparatuses according to the embodiment of the present invention shown in FIG. 1 and a plurality of wireless repeaters of the present invention shown in FIG. 2 are used.

  1, components having the same numbers as those in FIG. 4 are exactly the same in purpose, function, and operation, and thus description thereof will be omitted, and only components different from those in FIG. 4 will be described.

  In FIG. 4, the receiving means 2, the demodulating means 3 and the signal detecting means 7 are each one, whereas in FIG. 1, the receiving means are 2u, 2a and 2d, the demodulating means are 3u, 3a and 3d, and the signal detecting means. There are three means, 7u, 7a and 7d.

  The receiving means 2u is connected to the receiving antenna 1 and receives and outputs only a high-frequency signal having a specific frequency from among the innumerable high-frequency signals converted by the receiving antenna 1. This specific frequency is called a reception frequency fu. The receiving means 2u can receive only radio waves having the frequency fu.

  Similarly, the receiving means 2a and 2d are connected to the receiving antenna 1 and receive and output only a high-frequency signal of a specific frequency from among the innumerable high-frequency signals converted by the receiving antenna 1. The specific frequencies are called reception frequencies fa and fd, respectively. Receiving means 2a and 2d can receive only radio waves of frequencies fa and fd, respectively.

The demodulating means 3u is connected to the output of the receiving means 2u, demodulates the high frequency signal of the receiving frequency fu obtained by the receiving means 2u, and converts it into a required signal such as an audio signal.
Similarly, the demodulating means 3a and 3d are connected to the outputs of the receiving means 2a and 2d, respectively, demodulate the high frequency signals of the receiving frequencies fa and fd obtained by the receiving means 2a and 2d, and convert them into required signals such as audio signals. To do.

  The signal detection means 7u, 7a and 7d detect the output signals when the reception means 2u, 2a and 2d receive high-frequency signals fu, fa and fd having predetermined specific frequencies. The outputs of the signal detection means 7u, 7a, and 7d output a logic level H when a signal is detected, and a logic level L when a signal is not detected.

  Reference numerals 50u, 50a and 50d denote signal switches which open and close the connection between the outputs of the demodulating means 3u, 3a and 3d and the modulating means 4. The signal switches 50u, 50a and 50d are opened and closed by the outputs of the signal detection means 7u, 7a and 7d, respectively, and the outputs of the signal detection means 7u, 7a and 7d are turned on at the logic level H, that is, when a signal is detected. The outputs of the means 7u, 7a and 7d are OFF at the logic level L, that is, when no signal is detected.

  Accordingly, when the receiving means 2u receives the frequency fu, the output of the signal detecting means 7u becomes the logic level H and the signal switch 50u is turned on, so that the audio signal demodulated by the demodulating means 3u is the signal switch 50u. Is transmitted to the modulation means 4 via. The same applies when the receiving means 2a and 2d receive the frequencies fa and fd, respectively.

  In FIG. 1, reference numeral 8 denotes an intermittent timer, which outputs a logic level H and a logic level L alternately and continuously according to a set time.

  Reference numeral 9 denotes a control means, and four input terminals of the control means 9 are connected to the outputs of the signal detection means 7u, 7a and 7d and the output of the intermittent timer 8, respectively. The control means 9 is an OR circuit, and the output of the control means 9 becomes the logic level H when any one of the outputs of the signal detection means 7u, 7a and 7d and the output of the intermittent timer 8 becomes the logic level H. . Further, the output of the control means 9 becomes the logic level L only when the outputs of the signal detection means 7u, 7a and 7d and the output of the intermittent timer 8 are all at the logic level L. That is, when all of the signal detection means 7u, 7a and 7d are at the logic level L, that is, when any signal of the frequencies fu, fa and fd is not detected, the output of the control means 9 is the output of the intermittent timer 8 as it is. In response to the set time, the logic level H and the logic level L are continuously output alternately.

  The output of the control means 9 controls the switch 10 so that the switch 10 is turned on when the output of the control means 9 is at the logic level H, and the switch 10 is turned off when the output of the control means 9 is at the logic level L. Control.

  The operation of the wireless repeater configured as described above will be described below with reference to FIG. First, when the antenna 1 does not receive any radio waves of the reception frequencies fu, fa, and fd, the receiving means 2u, 2a, and 2d do not output high-frequency signals of the reception frequencies fu, fa, and fd, so that signal detection is performed. None of the means 7u, 7a and 7d detect the signal. Accordingly, the outputs of the signal detection means 7u, 7a and 7d are at the logic level L.

  On the other hand, since the intermittent timer 8 alternately outputs the logic level H and the logic level L according to the set time, even if all the outputs of the signal detection means 7u, 7a and 7d are at the logic level L, Only during the period when the output of the intermittent timer 8 outputs the logic level H, the output of the control means 9 outputs the logic level H.

  Accordingly, the switch 10 is turned on only during the period when the intermittent timer 8 outputs the logic level H, the power of the relay transmission means power supply terminal 11 is supplied to the relay transmission means 5, and the relay transmission means 5 performs the transmission operation. . That is, a radio wave having a frequency fb is transmitted. That is, even when the reception antenna 1 does not capture radio waves of the reception frequencies fu, fa, and fd, the relay transmission means 5 performs the transmission operation only during the period when the intermittent timer 8 outputs the logic level H, and the transmission is performed. A radio wave having a frequency fb is intermittently radiated into the space.

  However, in this case, since the outputs of the receiving means 2u, 2a and 2d are not demodulated by the demodulating means 3u, 3a and 3d, a demodulated output such as an audio signal is not output. Therefore, since the signal to be modulated is not transmitted to the modulation unit 4, the relay transmission unit 5 transmits the radio wave of only the carrier wave without the modulation signal. In this case, the radio wave of only the carrier wave without the modulation signal radiated has the same frequency as fb, but is assumed to have an intermittent transmission frequency fbb in order to distinguish it as an intermittently transmitted radio wave.

  Next, when the receiving antenna 1 captures a radio wave with the receiving frequency fu, the receiving means 2u outputs a high-frequency signal with the receiving frequency fu, so the signal detecting means 7u detects the signal. Accordingly, since the output of the signal detection means 7u becomes the logic level H, the signal switch 50u is also turned on, and the output of the demodulation means 3u is connected to the input of the modulation means 4. At the same time, the output of the control means 9 becomes the logic level H irrespective of the logic level of the output of the intermittent timer 8.

  Accordingly, the switch 10 is turned on, the power of the relay transmission means power supply terminal 11 is supplied to the relay transmission means 5, and the relay transmission means 5 performs a transmission operation. That is, when the receiving antenna 1 captures a radio wave having the reception frequency fu, the radio wave having the transmission frequency fb is radiated into the space just like the conventional example.

The same applies when the receiving antenna 1 captures a radio wave having the reception frequency fa or fd.
Since the receiving means 2a or 2d outputs a high frequency signal having the receiving frequency fa or fd, the signal detecting means 7a or 7d detects the signal. Accordingly, since the output of the signal detection means 7a or 7d becomes the logic level H, the signal switch 50a or 50d is also turned on, and the output of the demodulation means 3a or 3d is connected to the input of the modulation means 4. At the same time, the output of the control means 9 becomes the logic level H irrespective of the logic level of the output of the intermittent timer 8.

  Accordingly, the switch 10 is turned on, the power of the relay transmission means power supply terminal 11 is supplied to the relay transmission means 5, and the relay transmission means 5 performs a transmission operation. That is, even when the receiving antenna 1 captures a radio wave having the reception frequency fa or fd, the radio wave having the transmission frequency fb is radiated into the space.

  As described above, when a radio wave having the reception frequency fu is captured by the reception antenna 1, the radio wave having the reception frequency fu is converted to the transmission frequency fb again and transmitted, and a high-frequency signal as the radio wave is relayed. Although it is exactly the same as the conventional example in the point that can be performed, not only the reception frequency fu but also the radio wave of the reception frequency fa or fd is captured by the reception antenna 1, the radio wave of the reception frequency fa or fd is It is different from the conventional example in that it can be converted to the transmission frequency fb again and transmitted, and a high frequency signal as a radio wave can be relayed.

  In addition, even when the radio wave of the reception frequency fu, fa, or fd is not captured by the reception antenna 1, that is, when there is no radio wave of the reception frequency fu, fa, or fd, the radio wave of only the carrier wave not including the modulation signal is generated. The point which is intermittently radiated from the transmission antenna 6 as the intermittent transmission frequency fbb is also different from the conventional example.

  Since the electric power of the radio wave radiated from the transmitting antenna 6 is irrelevant to the presence or absence of the modulation signal in the case of FM modulation frequently used in the radio relay system, the electric field strength of the frequency fb at a certain point is the radio wave including the modulation signal. Even if it exists, it is the same even if it is a radio wave of only the carrier wave which does not contain a modulation signal.

  Next, the operation of the wireless communication device used in the wireless relay system of the present invention will be described with reference to FIG. In FIG. 2, the components denoted by the same reference numerals as those in FIG. 5 are completely the same in purpose, function, and operation, and thus description thereof will be omitted, and only components that are different from those in FIG. 5 will be described.

  In FIG. 2, 31 is a transmission frequency automatic setting means, and automatically switches one of the four transmission frequencies f1a, f2a, f3a and f4a stored in the transmission frequency storage means 18 and sets it as the transmission frequency. To do. The connection relationship of the transmission frequency automatic setting means 31 with the peripheral components is exactly the same as in FIG. 5, but the transmission frequency manual setting means 17 in FIG. 5 manually sets the transmission frequency, whereas FIG. The transmission frequency automatic setting means 31 is different in that the operation is automatically performed.

  Next, reference numeral 30 denotes a reception frequency automatic setting means, which automatically switches one of the four reception frequencies f1b, f2b, f3b and f4b stored in the reception frequency storage means 21 and sets it as the reception frequency. . The connection relationship of the reception frequency automatic setting means 30 with the peripheral components is exactly the same as in FIG. 5, but the reception frequency manual setting means 20 in FIG. 5 manually sets the reception frequency, whereas FIG. The reception frequency automatic setting means 30 in FIG. 3 differs in that the operation is automatically performed.

  Reference numeral 25 denotes signal strength determination means, and the input of the signal strength determination means 25 is connected to the output of the reception means 19. The signal strength determining means 25 detects the signal strength from the output signal of the receiving means 19, compares it with a preset signal strength, and outputs a logic level H if it is higher than the preset signal strength, When it is low, a logic level L is output. The preset signal strength is a signal strength for determining whether or not good communication is possible. If the signal strength is higher than the preset signal strength, good communication can be performed. If the signal is weaker than the set signal strength, good communication cannot be performed.

  A control timer 26 is connected to the output of the signal strength determination means 25. The control timer 26 outputs the logic level H as it is when the input logic level is H, and outputs the logic level L only when the state where the input logic level is L continues for a certain period of time. The certain time referred to here is a time longer than the cycle in which the intermittent timer 8 of the wireless repeater 8 in FIG.

  The output of the control timer 26 is connected to the reception frequency automatic setting means 30 and the transmission frequency automatic setting means 31. When the output of the control timer 26 is the logic level H, the reception frequency automatic setting means 30 and the transmission frequency automatic setting means 31 do not perform the frequency switching operation and maintain the current reception frequency and transmission frequency. When the output of the control timer 26 is a logic level L, the reception frequency automatic setting means 30 and the transmission frequency automatic setting means 31 are the four reception frequencies f1b stored in the reception frequency storage means 21 and the transmission frequency storage means 18. , F2b, f3b, f4b and four transmission frequencies f1a, f2a, f3a and f4a are automatically switched and set as reception frequency and transmission frequency, respectively.

  The operation of the wireless communication apparatus of the wireless relay system of the present embodiment configured as described above will be described below with reference to FIG.

  First, in FIG. 2, it is assumed that the transmission / reception selector switch 13 is connected to the contact b. The reception frequency automatic setting means 30 is connected to the contact 1b, and the transmission frequency automatic setting means 31 is connected to the contact 1a. Accordingly, the reception frequency in this state is f1b and the transmission frequency is f1a. Further, it is assumed that the signal intensity of the radio wave having the reception frequency f1b is sufficiently strong so that good communication can be performed.

  At this time, the signal strength determining means 25 detects the signal strength from the output signal of the receiving means 19 in accordance with the signal strength of the current reception frequency f1b, compares it with a preset signal strength, and sets a preset signal. When it is higher than the strength, the logic level H is output, and when it is lower, the logic level L is output. Accordingly, since the received radio wave at the frequency f1b has a signal strength that allows good communication, a logic level H is output.

  When the signal strength determination means 25 outputs a logic level H, the control timer 26 outputs a logic level H, so the reception frequency automatic setting means 30 does not perform a frequency switching operation. Therefore, the reception state at the current reception frequency f1b is continued. The reception operation in the state where the reception state is continued is exactly the same as the operation of the conventional example using FIG.

  When the radio wave of the reception frequency f1b is a transmission radio wave from the wireless repeater in FIG. 1, f1b is either a continuous radio wave during the relay operation of the radio repeater or an intermittent transmission radio wave of the radio repeater that does not perform the relay operation. It is.

  When the reception frequency f1b is a continuous radio wave during the relay operation of the wireless repeater in FIG. 1, the output of the signal strength determining means 25 continues to output the logic level H, so the output of the control timer 26 is also the logic level H. Are continuously output, and the reception frequency and the transmission frequency are not switched.

  Further, when the reception frequency f1b is the intermittent transmission radio wave of the wireless repeater in FIG. 1, the output of the signal strength determination means 25 becomes the logic level H during the transmission operation of the wireless repeater, and the transmission of the wireless repeater is suspended. The output of the signal strength determination means 25 is a logic level L. That is, the logic level of the signal strength determination means 25 is the same as the output logic level of the intermittent timer 8 of the wireless repeater in FIG.

  Since the control timer 26 outputs the logic level L only when the period when the input logic level of the control timer 26 is L is longer than the period in which the intermittent timer 8 of the wireless repeater in FIG. When the output of the signal strength determination means 25 is at the same timing as the intermittent timer 8 of the wireless repeater in FIG. 1, the output of the control timer 26 does not become the logic level L.

  That is, if the radio wave having the reception frequency f1b is the radio wave transmitted by the wireless repeater in FIG. 1 and has a sufficient signal strength to enable good communication, the radio wave is a continuous radio wave during the relay operation. However, the output of the control timer does not become the logic level L even if the intermittent transmission radio wave is generated by the intermittent timer. Therefore, the reception frequency f1b and the transmission frequency f1a are not switched. Therefore, when the signal strength of the transmission radio wave of the radio repeater in FIG. 1 is stronger than the preset signal strength, the radio communication device in FIG. 2 continues to receive radio waves at the reception frequency.

  At this time, if the transmission / reception selector switch 13 is switched to the contact point a, the transmission frequency f1a is paired with the reception frequency f1b. Similarly, the transmission operation in the state in which the transmission frequency is set is the same as the operation of the conventional example described with reference to FIG.

  Next, when the wireless communication device in FIG. 2 moves away from the wireless repeater in FIG. 1 and the signal strength of the reception frequency f1b becomes weaker, the output signal level of the receiving means 19 also decreases and becomes lower than the preset signal strength. Then, the signal strength determination means 25 outputs a logic level L. In this case, since the signal strength of both the transmission radio wave during the relay operation of the wireless repeater in FIG. 1 and the intermittent transmission radio wave by the intermittent timer decreases, the output of the signal strength determination means 25 outputs the logic level L continuously and in the long term To do.

  In this case, the period in which the logical level of the input of the control timer 26 is L is longer than the period in which the intermittent timer 8 of the wireless repeater in FIG. 1 outputs the logical level L, so the control timer 26 outputs the logical level L. To do. Accordingly, the reception frequency automatic setting means 30 operates and switches the reception frequency from f1b to f2b. At the same time, the transmission frequency is switched from f1a to f2a.

  At this time, if the intensity of the radio wave at the reception frequency f2b is strong enough for the signal strength determination means 25 to output the logic level H, the output of the control timer 26 becomes the logic level H, the reception frequency is f2b, and the transmission frequency is The state set to f2a is maintained.

  At this time, if the intensity of the radio wave at the reception frequency f2b is weak or none and the signal strength determination means 25 maintains the logic level L, the output of the control timer 26 remains at the logic level L, and the reception frequency The automatic setting means 30 switches the reception frequency from f2b to f3b. At the same time, the transmission frequency is switched from f2a to f3a.

  As described above, the radio communication device of the radio relay system according to the present embodiment can automatically set another communicable radio frequency when communication via the radio repeater in FIG. I can do it.

  The operation when a wireless relay system is constructed by using a plurality of the wireless repeaters of the present embodiment and the wireless communication devices of the present embodiment configured as described above will be described with reference to FIGS. Will be described. In FIG. 3, the constituent elements denoted by the same reference numerals as those in FIG. 6 are completely the same in purpose, function and operation, and thus description thereof is omitted.

  In FIG. 3, 61, 62, 63 and 64 are the wireless repeaters of the present embodiment shown in FIG. The wireless repeater of the present embodiment is provided in each of the four areas from the first area to the fourth area, which is the same as the conventional example in FIG.

3 differs from FIG. 6 in the following points.
(1) In addition to transmitting f1b, f2b, f3b, and f4b as transmission frequencies, the wireless repeaters 61, 62, 63, and 64 also intermittently transmit radio waves of frequencies f1bb, f2bb, f3bb, and f4bb, respectively.
(2) The wireless repeaters 61, 62, 63, and 64 receive the transmission frequencies f1a, f2a, f3a, and f4a of the wireless communication devices in the same area, and relay and transmit them in areas adjacent to each other. The transmission radio wave from the repeater is also received and relayed.

  The frequencies f1bb, f2bb, f3bb, and f4bb correspond to the intermittent transmission frequency fbb of the wireless repeater of the embodiment in FIG. 1, and when there is no radio wave to be relayed, the wireless repeater intermittently has no modulated signal. This is the radio wave when transmitting. Accordingly, the frequencies are the same as f1b, f2b, f3b, and f4b, but are assumed to be intermittent transmission frequencies f1bb, f2bb, f3bb, and f4bb, respectively, in order to distinguish them as intermittently transmitted radio waves. Reference numeral 65 denotes a wireless communication device according to the present embodiment, and the owner is B as in the conventional example.

  The frequency of the radio wave received by the receiving means of the radio repeaters 61, 62, 63 and 64 in each of the first, second, third and fourth areas is as follows.

The receiving means 2u in FIG. 1 of the wireless repeater 61 in the first area receives f2b.
The receiving means 2a in FIG. 1 of the wireless repeater 61 in the first area receives f1a.
The receiving means 2d in FIG. 1 of the wireless repeater 61 in the first area does not perform the receiving operation.

The receiving means 2u in FIG. 1 of the wireless repeater 62 in the second area receives f3b.
The receiving means 2a in FIG. 1 of the wireless repeater 62 in the second area receives f2a.
The receiving means 2d in FIG. 1 of the wireless repeater 62 in the second area receives f1b.

The receiving means 2u in FIG. 1 of the wireless repeater 63 in the third area receives f4b.
The receiving means 2a in FIG. 1 of the wireless repeater 63 in the third area receives f3a.
The receiving means 2d in FIG. 1 of the wireless repeater 63 in the third area receives f2b.

The receiving means 2u in FIG. 1 of the wireless repeater 64 in the fourth area does not perform the receiving operation.
The receiving means 2a in FIG. 1 of the wireless repeater 64 in the fourth area receives f4a.
The receiving means 2d in FIG. 1 of the wireless repeater 64 in the fourth area receives f3b.

That is,
(1) The receiving means 2u in FIG. 1 of the wireless repeater in each area receives the radio wave transmitted from the upstream (up) wireless repeater.
(2) The receiving means 2a in FIG. 1 of the wireless repeater in each area receives the radio wave transmitted from the wireless communication device in the same area.
(3) The receiving means 2d in FIG. 1 of the wireless repeater in each area receives the radio wave transmitted from the downstream wireless repeater.

  The operation of the wireless relay system of the present embodiment configured as described above will be described with reference to FIG.

  In FIG. 3, it is assumed that the owner B is currently in the first zone, and the radio repeaters 61, 62, 63, and 64 in each zone do not perform a relay operation and are in an intermittent transmission state. Accordingly, it is assumed that the intermittent transmission radio wave f1bb from the radio repeater 61 in the first area has reached the radio communication device 65 with the intensity of radio waves that can be communicated. Accordingly, the reception frequency of the wireless device 65 is set to f1b, and the transmission frequency is set to f1a.

  The operation of the wireless communication device 65 in which the reception frequency is set to f1b and the transmission frequency is set to f1a is exactly the same as the operation of the conventional wireless relay system described with reference to FIG. That is, the owner B in the first area transmits a radio wave of the transmission frequency f1a using the wireless communication device 65 in order to perform a radio call with the owner A1 in the same first area. The wireless repeater 61 receives the radio wave of the frequency f1a, converts it to a radio wave of the frequency f1b, and retransmits it. In this case, since the radio repeater 61 detects the radio wave of the frequency f1a by the signal detection means 7 in FIG. 1, the transmission is not intermittent, and the frequency t1b is a period during which the owner B is in the transmission state. A continuous transmission operation is performed at. The owner A1 can receive the radio wave of the transmission frequency f1b of the wireless repeater 61 and listen to the voice of the owner B.

  When owner A1 transmits a radio wave of transmission frequency f1a using radio communication device 41 in order to respond to owner B, radio repeater 61 receives the radio wave of frequency f1a and converts it to a radio wave of frequency f1b. Resend. The owner B can receive the radio wave of the transmission frequency f1b of the wireless repeater 61 and can listen to the voice of the owner A1, which is exactly the same as the operation of the conventional example of FIG.

  Next, the owner B in the first area transmits a radio wave having the transmission frequency f1a using the wireless communication device 65 in order to perform a radio call with the owner A2 in the second area. The wireless repeater 61 receives the radio wave of the frequency f1a, converts it to a radio wave of the frequency f1b, and retransmits it. In this case, since the radio repeater 62 in the second area detects the radio wave of the frequency f1b by the signal detection means 7d in FIG. 1, the transmission is not intermittent and the owner B is in the transmission state. The continuous transmission operation is performed at the frequency f2b during the period. The owner A2 can receive the radio wave of the transmission frequency f2b of the wireless repeater 62 and listen to the voice of the owner B.

  When the owner A2 transmits a radio wave having the transmission frequency f2a using the wireless communication device 42 in order to respond to the owner B, the radio repeater 62 receives the radio wave having the frequency f2a and converts it to a radio wave having the frequency f2b. Resend. In this case, since the wireless repeater 61 in the first area detects the radio wave of the frequency f2b by the signal detection means 7u in FIG. 1, the transmission is not intermittent, and the owner A2 is in the transmission state. The continuous transmission operation is performed at the frequency f1b during the period. The owner B can receive the radio wave of the transmission frequency f1b of the wireless repeater 61 and can hear the voice of the owner A2.

  The same applies to the case where the owner B in the first area transmits a radio wave of the transmission frequency f1a using the wireless communication device 65 in order to make a radio call with the owner A3 in the third area. The person A3 can hear the voice of the owner B.

(1) The owner B transmits the frequency f1a by the wireless communication device 65.
(2) The wireless repeater 61 in the first area converts the frequency f1a to the frequency f1b and relays it.
(3) The radio repeater 62 in the second zone converts the frequency f1b to the frequency f2b and relays it.
(4) The wireless repeater 63 in the third area converts the frequency f2b to the frequency f3b and relays it.
(5) The owner A3 in the third area receives the radio wave having the transmission frequency f3b of the wireless repeater 63.

  The same applies to the case where the owner A3 in the third area transmits a radio wave of the transmission frequency f3a using the wireless communication device 43 in order to respond to the owner B in the first area. B can hear the voice of owner A3.

(1) The owner A3 transmits the frequency f3a by the wireless communication device 43.
(2) The wireless repeater 63 in the third area converts the frequency f3a to the frequency f3b and relays it.
(3) The radio repeater 62 in the second area converts the frequency f3b into the frequency f2b and relays it.
(4) The wireless repeater 61 in the first zone converts the frequency f2b to the frequency f1b and relays it.
(5) The owner B in the first area receives the radio wave having the transmission frequency f1b of the wireless repeater 61.

Similarly, owner A4 in the fourth zone can hear the voice of owner B in the first zone in the following order.
(1) The owner B transmits the frequency f1a by the wireless communication device 65.
(2) The wireless repeater 61 in the first area converts the frequency f1a to the frequency f1b and relays it.
(3) The radio repeater 62 in the second zone converts the frequency f1b to the frequency f2b and relays it.
(4) The wireless repeater 63 in the third area converts the frequency f2b to the frequency f3b and relays it.
(5) The wireless repeater 64 in the fourth area converts the frequency f3b to the frequency f4b and relays it.
(6) The owner A4 in the fourth area receives the radio wave having the transmission frequency f4b of the wireless repeater 64.

  Similarly, when the owner A4 in the fourth area responds to the owner B in the first area, the owner B can hear the voice of the owner A4 in the following order.

(1) The owner A4 transmits the frequency f4a by the wireless communication device 44.
(2) The radio repeater 64 in the fourth area converts the frequency f4a to the frequency f4b and relays it.
(3) The wireless repeater 63 in the third area converts the frequency f4b to the frequency f3b and relays it.
(4) The radio repeater 62 in the second zone converts the frequency f3b to the frequency f2b and relays it.
(5) The wireless repeater 61 in the first zone converts the frequency f2b to the frequency f1b and relays it.
(6) The owner B in the first area receives the radio wave having the transmission frequency f1b of the wireless repeater 61.

  In this way, the owner B can talk to not only the owner A1 of the same first area but also the owners of all areas.

Next, the case where the owner B ends the call in the first area and moves to the second area will be described.
The radio repeater 61 stops the continuous transmission as the relay operation at the frequency f1b because the radio wave of the transmission frequency f1a of the radio communication device 65 is lost, and transmits the intermittent transmission frequency f1bb again. Accordingly, the wireless communication device 65 continues to receive the radio wave having the frequency f1bb.

  In the process in which the owner B moves from the first area to the second area, the intensity of the radio wave having the frequency f1bb reaching the wireless communication device 65 decreases, so the input level of the signal intensity determination unit 25 in FIG. 2 also decreases. To do. Then, when the input level of the signal strength determination unit 25 in FIG. 2 becomes equal to or lower than the preset signal strength, the wireless communication device 65 switches the reception frequency from f1b to f2b.

  At this time, since the frequency f2bb is intermittently transmitted from the wireless repeater 62 in the second area, the input level of the signal strength determination means 25 in FIG. 2 of the wireless device 65 increases, but the signal strength determination means in FIG. When the input level of 25 is equal to or lower than the preset signal strength, the output of the signal strength determination means 25 remains at the logical level L, so that the reception frequency is further switched to f3b, f4b, f1b, f2b, f3b,. . If the input level of the signal strength determination means 25 in FIG. 2 is equal to or higher than the preset signal strength when the reception frequency becomes f2b again, the output of the signal strength determination means 25 outputs a logic level H. At that time, the reception frequency is set to f2b.

  Since the reception frequency and the transmission frequency are paired, the reception frequency f2b is set, and at the same time, the transmission frequency is automatically set to f2a, and the wireless repeater 62 is set in exactly the same manner as in the first area. Wireless communication can be performed. That is, when the owner B moves from the first area to the second area, if the reception signal strength of the intermittent transmission frequency f2bb of the wireless repeater 62 in the second area is low, the reception frequency of the wireless communication apparatus 62 is determined. However, if the owner B enters the second area and the wireless communication device 65 receives the intermittently transmitted radio wave of the wireless relay device 62 at a signal strength higher than a preset value, the reception frequency is automatically set to f2b. Is done.

  As described above, the owner B in the first area can talk to the owner A2 in the second area, so that the owner B who has moved to the second area can talk to the owner A1 in the first area. Needless to explain.

  Similarly, even when the owner B moves to the third area and the fourth area, the radio communication device 65 receives radio waves having a frequency having communicable radio wave intensity and performs the same operation. It is automatically set as the reception frequency, and at the same time, the transmission frequency paired with the reception frequency is set. Therefore, the frequency of the wireless communication device is automatically set to the frequency of the wireless repeater installed in each area.

As mentioned above, the owner B in the first area can talk to the owner A3 in the third area, so that the owner B who has moved to the third area can talk to the owner A1 in the first area. Needless to explain.
Similarly, since the owner B of the first area can talk to the owner A4 of the fourth area as described above, the owner B who has moved to the fourth area can talk to the owner A1 of the first area. is there.

  That is, it is possible to talk even if the owners of the wireless communication devices are in different areas, and it is not necessary to manually change the transmission / reception frequency of the wireless communication device at the time of communication. Therefore, it is not necessary to know the transmission / reception frequency of the wireless repeater installed in each area, and the owner B does not need to be aware of how many areas he is currently in. Therefore, communication can be performed immediately, and extremely quick wireless communication is possible. Furthermore, the callable range can be expanded unlimitedly as long as the accumulation of signal degradation due to the relay operation of the wireless repeater is not affected.

As described above, according to the present embodiment,
(1) Receiving means for receiving radio waves of a plurality of predetermined frequencies simultaneously or in a time-division manner, and demodulation for demodulating a necessary signal such as an audio signal from the signal output by the receiving means Means, a modulating means for modulating the signal output by the demodulating means, a transmitting means for transmitting the signal modulated by the modulating means as a radio wave, and the output signals of the receiving means A signal detection means for determining the presence or absence of a radio wave signal of a frequency, an intermittent timer for intermittently operating the transmission means at a predetermined timing, and the radio wave of the plurality of frequencies by the signal detection means. When a signal is detected at any one of the frequencies, the transmission unit is set in a transmission state, and the plurality of wireless power supplies are set by the signal detection unit. A radio repeater either if it is not found in one of the signal and a control means for intermittently operating the transmitting means by the timing of the intermittent timer,
(2) A modulation transmission function and a reception demodulation function for performing wireless communication, the reception frequency storage means for storing a plurality of reception frequencies, and the reception frequencies stored in the reception frequency storage means A reception frequency automatic setting means for automatically switching and setting, a signal strength determination means for determining whether the reception signal strength at the reception frequency is higher or lower than a preset reception signal strength, and the signal strength determination means When it is determined that the received signal strength is higher than the preset received signal strength, the operation of the reception frequency automatic setting means is stopped and the reception operation at the currently received reception frequency is continued, and the signal strength determining means If the state in which the received signal strength is determined to be lower than the preset received signal strength continues for a certain period of time, the above reception frequency automatic setting is performed. A control timer for controlling to automatically switch the reception frequency by starting the stage operation, and a transmission frequency for storing a plurality of transmission frequencies uniquely determined corresponding to each of the plurality of reception frequencies To automatically set one transmission frequency uniquely determined corresponding to the reception frequency as the latest transmission frequency when one reception frequency is set by the storage means and the reception frequency automatic setting means By providing a wireless communication device equipped with a transmission frequency automatic setting means of
When the signal strength of the currently received radio wave is lower than the preset signal strength, the reception frequency is automatically switched, and the frequency of the radio wave transmitted by the wireless repeater having the communicable signal strength is received by the wireless communication device. As the frequency is automatically set, the transmission frequency of the wireless communication device is automatically set in conjunction with it, and the wireless repeater also performs the relay operation of the radio wave transmitted from the wireless repeater in the adjacent area at the same time ,
(1) A call can be made even if the owners of wireless communication devices are in different areas.
(2) Even if moving between areas, it is not necessary to manually change the transmission frequency and reception frequency of the wireless communication device during call communication.
(3) Therefore, there is no need to be aware of the transmission / reception frequency of the wireless repeater installed in each area and the area where the owner of the wireless communication device is currently located.
(4) Therefore, communication can be performed immediately, and prompt wireless communication can be performed.
(5) Furthermore, as long as the accumulation of signal deterioration due to the relay operation of the wireless repeater is not affected, the callable range can be expanded without limitation.

In this embodiment,
(1) The reception frequency automatic setting means 30 and the transmission frequency automatic setting means 31 of the wireless communication apparatus of this embodiment in FIG. 2 are described as mechanical switches.
(2) The control timer 26 in FIG. 2, the signal strength determination means 25 in FIG. 2, the intermittent timer 8 in FIG. 1, and the control means 9 in FIG. 1 are described as independent functions.
(3) The reception frequency storage means 21 and the transmission frequency storage means 18 are described as independent storage media.
However, it goes without saying that the above series of functions can be realized by software and hardware of a microcomputer.

  Further, in the present embodiment, assuming wireless communication in four areas, the number of wireless repeaters and the number of reception frequency storage means and the number of transmission frequency storage means are four, but the effect of the invention is the frequency It is effective regardless of the number of storage means and the number of areas.

  Furthermore, in this embodiment, each area is arranged in a straight line, but even in a group of areas having a two-dimensional extent, positions where radio repeaters installed in each area can communicate with each other If there is a relationship, it is not necessary to limit radio waves from adjacent areas to two types of radio waves from upstream and downstream. By increasing the combination of receiving means 2u, 2a, 2d, demodulating means 3u, 3a, 3d signal detecting means 7u, 7a, 7d and signal switches 50u, 50a, 50d in FIG. It is clear that the telephone range can be expanded in the vertical direction.

  Furthermore, in the present embodiment, the three sets of receiving means, demodulating means, and signal detecting means have been described as independent functional blocks, but one set of receiving means and demodulating means can be obtained by scanning a plurality of receiving frequencies at high speed. It is obvious that the same effect can be obtained by the signal detection means.

The block diagram of the radio repeater of the radio relay system which shows embodiment of this invention Block diagram of the wireless communication device of the wireless relay system System operation diagram of the wireless relay system Block diagram of a wireless repeater of a conventional wireless relay system Block diagram of a wireless communication device of a conventional wireless relay system System operation diagram of conventional wireless relay system

Explanation of symbols

2, 2u, 2a, 2d ... receiving means 3, 3u, 3a, 3d ... demodulating means 4 ... modulating means 5 ... relay transmitting means 7, 7u, 7a, 7d ... signal detecting means 8. Intermittent timer 9 Control means 18 Transmission frequency storage means 21 Reception frequency storage means 25 Signal strength determination means 26 Control timer 30 Reception frequency automatic setting means 31 Transmission frequency automatic setting means

Claims (1)

Receiving means for receiving radio waves of a plurality of predetermined frequencies simultaneously or in a time-division manner, demodulating means for demodulating a necessary signal such as an audio signal from the signal output by the receiving means, Modulating means for modulating the signal output by the demodulating means, transmitting means for transmitting the signal modulated by the modulating means as a radio wave, and wireless signals of the plurality of frequencies by the output signal of the receiving means Any one of the radio waves of the plurality of frequencies by the signal detection means for determining the presence or absence of the signal of the radio wave, the intermittent timer for intermittently operating the transmission means at a predetermined timing, and the signal detection means. When a signal is detected at one frequency, the transmission means is set to a transmission state, and the signal detection means RF repeater and a control means for intermittently operating the transmitting means by the timing of the intermittent timer when one of the signals is also not detected (1),
It has a modulation transmission function and a reception demodulation function for performing wireless communication, and automatically receives reception frequency storage means for storing a plurality of reception frequencies, and reception frequencies stored in the reception frequency storage means. Reception frequency automatic setting means for switching and setting, signal strength determining means for determining whether the received signal strength at the receiving frequency is higher or lower than a preset received signal strength, and the received signal strength by the signal strength determining means Is determined to be higher than a preset received signal strength, the operation of the automatic reception frequency setting means is stopped, and the reception operation at the currently received reception frequency is continued. When the state in which the strength is determined to be lower than the preset received signal strength continues for a certain period of time, the reception frequency automatic setting means A control timer for controlling to automatically switch the reception frequency by starting operation, and a transmission frequency storage means for storing a plurality of transmission frequencies uniquely determined corresponding to each of the plurality of reception frequencies And a transmission for automatically setting one transmission frequency uniquely determined corresponding to the reception frequency as the latest transmission frequency when one reception frequency is set by the reception frequency automatic setting means. Wireless communication device with automatic frequency setting means (2)
And a wireless relay system.

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