JP4588584B2 - Wireless relay system - Google Patents

Description

  The present invention relates to a wireless relay system used to expand 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 shows 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 a wireless relay system diagram when a plurality of conventional wireless communication devices and a plurality of conventional wireless 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 receives the radio wave transmitted by the radio repeater 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 device is in a reception state, captures radio waves radiated into space, and converts them into high-frequency signals. When the wireless communication device 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 that sets the wireless communication device to either the reception state or the transmission state. When the transmission / reception selector switch 13 is connected to the contact a, the wireless communication device is in a transmission state, and when it is connected to the contact b, the wireless communication device 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 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 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 wireless repeaters of the conventional example shown in FIG. 5, and are installed on the first to fourth floors of a four-story building.

  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. On the first floor where the wireless repeater 51 is installed, there is an owner A1 having a wireless communication device 41. Similarly, on the second floor where a wireless repeater 52 is installed, an owner A2 having a wireless communication device 42, On the third floor where the wireless repeater 53 is installed, there is an owner A3 with the wireless communication device 43, and on the fourth floor where the wireless repeater 54 is installed, there is an owner A4 with the wireless communication device 44. To do.

  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 on the same first floor as the owner A1, but is far away and cannot communicate directly with the wireless communicator. It must be in a positional relationship that must pass through.

Here, the owner B on the first floor transmits a radio wave having a transmission frequency f1a using the wireless communication device 60 in order to make a radio call with the owner A1 on the same first floor.
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 a wireless relay device, and voice communication is possible via the wireless relay device 51 even when the owner A1 and the owner B cannot communicate directly. It becomes.

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

(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 on each floor and the floor on which 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.

  The present invention solves the above problems, and when moving to a different floor, it is not necessary to manually change the transmission / reception frequency of the wireless communication device, and automatically changes to the transmission / reception frequency of the wireless repeater that enables voice communication. It is to provide a wireless relay system that can be matched.

Means for solving the problem

In order to solve the above problems, the wireless relay system of the present invention
(1) Receiving means for receiving radio waves, demodulating means for demodulating a necessary signal such as an audio signal from the signal output by the receiving means, and modulating the signal output by the demodulating means Modulation means, transmission means for transmitting a signal modulated by the modulation means as a radio wave, signal detection means for determining the presence or absence of an output signal from the reception means, and at a predetermined timing An intermittent timer for intermittently operating the transmission means, and the intermittent timer when the signal detection means sets the transmission means to a transmission state and no signal is detected by the signal detection means A wireless repeater comprising control means for intermittently operating the transmission means at the timing of
(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.

The invention's effect

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. Since the frequency of the transmission radio wave of 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,
(1) During communication, there is no need to manually change the transmission frequency and reception frequency of the wireless communication device.
(2) Therefore, there is no need to be aware of the frequency of transmission / reception of the wireless repeater installed on each floor and the floor on which the owner of the wireless communication device is currently located.
(3) Accordingly, communication can be performed immediately, and prompt wireless communication can be performed.

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 is a wireless relay system diagram when the wireless communication apparatus of 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. 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 control means, and two input terminals of the control means 9 are connected to the output of the signal detection means 7 and the output of the intermittent timer 8, respectively. The control means 9 is an OR circuit, and when the output of the signal detection means 7 is either the logic level H or the output of the intermittent timer 8 is the logic level H, the output of the control means 9 becomes the logic level H, and the signal detection means The output of the control means 9 becomes the logic level L only when both the output of 7 and the output of the intermittent timer 8 are at the logic level L.

  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 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. Therefore, the output of the signal detection means 7 is at the logic level L.

  On the other hand, since the intermittent timer 8 outputs the logic level H and the logic level L alternately according to the set time, even if the output of the signal detection means 7 is the logic level L, the output of the intermittent timer 8 The output of the control means 9 outputs the logic level H only during the period during which is outputting 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 a radio wave having the reception frequency fa, 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 radio wave having the transmission frequency fb. Are intermittently radiated into the space.

  However, in this case, since the output of the receiving means 2 is not demodulated by the demodulating means 3, a demodulated output such as an audio signal is not output. Therefore, since there is no signal modulated by the modulation unit 4, the relay transmission unit 5 transmits radio waves of only a carrier wave without a 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 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, since the output of the signal detecting means 7 becomes the logic level H, 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 with the reception frequency fa, the radio wave with the transmission frequency fb is radiated into the space just like the conventional example.

  As described above, when a radio wave having the reception frequency fa is captured by the reception antenna 1, the radio wave having the reception frequency fa is converted to the transmission frequency fb again and transmitted, and the high-frequency signal as the radio wave is relayed. However, even if the radio wave of the reception frequency fa is not captured by the receiving antenna 1, that is, the radio wave of the reception frequency fa does not exist, only the carrier wave that does not include the modulation signal. Is different from the conventional example in that the radio wave is intermittently radiated from the transmission antenna 6 as the intermittent transmission frequency fbb.

  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 a 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 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 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 the four transmission frequencies f1a, f2a, f3a, f4a are each automatically switched and set as a reception frequency and a transmission frequency.

  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 having 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 relay machine or an intermittent transmission radio wave of the radio relay machine 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 determination means 25 continues to output the logic level H, so the output of the control timer 26 also has 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 radio repeater in FIG. 1, the output of the signal strength determination means 25 becomes the logic level H during the transmission operation of the radio repeater, and the transmission of the radio 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 wave during the relay operation of the wireless repeater. 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 relay device 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 is lowered, the output of the signal strength judgment 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 cycle in which the intermittent timer 8 of the wireless relay device 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 wireless communication device of the wireless relay system according to the present embodiment can automatically set another communicable radio frequency when communication via the wireless relay device 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 this embodiment is provided on the first to fourth floors of a four-story building, which is the same as the conventional example in FIG.

  3 differs from FIG. 6 in that the radio repeaters 61, 62, 63, and 64 transmit f1b, f2b, f3b, and f4b as transmission frequencies, respectively, and the frequencies f1bb, f2bb, f3bb, and f4bb, respectively. This is the point of intermittent transmission of radio waves.

  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. Therefore, 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 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 on the first floor, and the wireless relay devices 61, 62, 63, and 64 on each floor do not perform a relay operation and are in an intermittent transmission state. Therefore, it is assumed that the intermittent transmission radio wave f1bb from the radio relay 61 on the first floor 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 on the first floor 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 A1 on the same first floor. 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 having the frequency f1a by the signal detecting means 7 in FIG. 1, the intermittent transmission is not performed, and the frequency f1b 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 A1.

  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 hear the voice of the owner A1, which is the same as the operation of the conventional example of FIG.

Next, a case where the owner B ends the call on the first floor and moves to the second floor will be described.
The wireless repeater 61 stops continuous transmission as a relay operation at the frequency f1b, 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 floor to the second floor, the intensity of the radio wave having the frequency f1bb reaching the wireless communication device 65 decreases, so the input level of the signal strength determination means 25 in FIG. 2 also decreases. 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 repeater 62 on the second floor, the input level of the signal strength determination means 25 in FIG. 2 of the wireless device 65 rises, but the signal strength determination means 25 in FIG. When the input level 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 passes through the wireless repeater 62 in exactly the same manner as the operation on the first floor. Wireless communication can be performed.

  Similarly, even when the owner B moves from the third floor to the fourth floor, the wireless communication device 65 receives the radio wave having the frequency with which the communicable radio wave intensity can be received, and uses the received frequency as the reception frequency. Is set automatically, and at the same time, the transmission frequency that makes a pair with the reception frequency is set. Therefore, the frequency of the wireless communication device can be automatically adjusted to the frequency of the wireless repeater installed on each floor.

  That is, it is not necessary to manually change the transmission / reception frequency of the wireless communication device during communication. Therefore, it is not necessary to know the transmission / reception frequency of the wireless repeater installed on each floor, and the owner B does not need to be aware of what floor he is currently on. Therefore, communication can be performed immediately, and extremely quick wireless communication is possible.

As described above, according to the present embodiment,
In order to solve the above problems, the wireless relay system of the present invention
(1) Receiving means for receiving radio waves, demodulating means for demodulating a necessary signal such as an audio signal from the signal output by the receiving means, and modulating the signal output by the demodulating means Modulation means, transmission means for transmitting a signal modulated by the modulation means as a radio wave, signal detection means for determining the presence or absence of an output signal from the reception means, and at a predetermined timing An intermittent timer for intermittently operating the transmission means, and the intermittent timer when the signal detection means sets the transmission means to a transmission state and no signal is detected by the signal detection means A wireless repeater comprising control means for intermittently operating the transmission means at the timing of
(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. Since the frequency is automatically set and the transmission frequency of the wireless communication device is automatically set in conjunction with it,
(1) During communication, there is no need to manually change the transmission frequency and reception frequency of the wireless communication device.
(2) Therefore, there is no need to be aware of the frequency of transmission / reception of the wireless repeater installed on each floor and the floor on which the owner of the wireless communication device is currently located.
(3) Accordingly, communication can be performed immediately, and prompt wireless communication can be performed.

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.

  In the present embodiment, the number of wireless repeaters and the number of reception frequency storage means and the number of transmission frequency storage means are four assuming a four-story building, but the effect of the invention is the number of memories, It is effective regardless of the number of times.

(Describe all attached drawings.)

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 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 diagram of conventional wireless relay system

Explanation of symbols

2 reception means 3 demodulation means 4 modulation means 5 relay transmission means 7 signal detection means 8 intermittent timer 9 control means 18 transmission frequency storage means 21 reception frequency storage means 25 signal intensity determination means 26 control timer 30 reception frequency automatic setting means 31 transmission frequency Automatic setting means

Claims (1)

A receiving means for receiving a radio wave having a predetermined specific frequency, a demodulating means for demodulating a necessary signal such as an audio signal from the signal output by the receiving means, and output by the demodulating means A modulation means for modulating the received signal, a transmission means for transmitting the signal modulated by the modulation means as a radio wave having a frequency different from the reception frequency corresponding to the reception frequency, and an output signal of the reception means Signal detecting means for determining presence / absence, intermittent timer for intermittently operating the transmitting means at a predetermined timing, and setting the transmitting means to a transmission state when a signal is detected by the signal detecting means and and if the signal by the signal detecting means does not detect a variation is intermittently operating the transmitting means by the timing of the intermittent timer RF repeater and a control unit. Used to transmit only no signal carrier (1),
A reception frequency storage means for storing a plurality of reception frequencies corresponding to different transmission frequencies of the plurality of wireless repeaters , having a modulation transmission function and a reception demodulation function for performing wireless communication; and Reception frequency automatic setting means for automatically switching and setting the reception frequency stored in the reception frequency storage means, and a signal for determining whether the reception signal strength at the reception frequency is higher or lower than the preset reception signal strength When the received signal strength is determined to be higher than the preset received signal strength by the strength determining unit and the signal strength determining unit, the operation of the reception frequency automatic setting unit is stopped and the received frequency at the currently received reception frequency is The reception operation is continued, and there is a state in which the signal strength determining means determines that the received signal strength is lower than a preset received signal strength. When the time continues, a control timer for controlling the reception frequency to be automatically switched by starting the operation of the reception frequency automatic setting means is uniquely determined corresponding to each of the plurality of reception frequencies. A transmission frequency storage means for storing a plurality of transmission frequencies, and one transmission frequency uniquely determined corresponding to the reception frequency when one reception frequency is set by the reception frequency automatic setting means. Wireless communication device (2) provided with automatic transmission frequency setting means for automatically setting as the latest transmission frequency
And a wireless relay system.

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