JP4805241B2 - Wireless repeater - Google Patents

Description

  The present invention relates to a wireless repeater used in a wireless simultaneous call system in which three or more persons make a simultaneous call using a portable wireless communication device commonly called a portable transceiver.

  In recent years, wireless repeaters have been used in various fields as the use of wireless communication devices expands. Especially for radios called specific low-power radios, a system that allows multiple people to talk and listen at the same time as a telephone using a wireless communication device is used in many ways, and more than three Special radio waves for simultaneous calls are also assigned.

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 general wireless communication device for simultaneous calls. FIG. 5 is a block diagram of a conventional wireless repeater for three-party simultaneous call. Further, FIG. 6 shows an operation explanatory diagram in the case where three wireless communication devices shown in FIG. 4 are used and a simultaneous wireless communication between three parties is performed via the wireless relay device shown in FIG.

  In FIG. 4, reference numeral 21 denotes a transmission / reception antenna that captures radio waves radiated into space and converts them into high-frequency signals, and radiates high-frequency power into the space during transmission.

  Reference numeral 24 denotes reception demodulation means for demodulating a high-frequency signal having a predetermined frequency from the high-frequency signals obtained by the transmission / reception antenna 21 and converting it into an audio signal. A speaker 26 converts an electrical audio signal obtained by the reception demodulation means 24 into sound.

  Reference numeral 25 denotes a microphone that converts a human voice into an electric signal. A modulation transmission means 23 is connected to the output of the microphone 25, converts the audio signal converted by the microphone 25 into a signal of a format that can be transmitted as a radio wave, and amplifies it to the power necessary for radiating it as a radio wave.

  A duplexer 22 transmits the transmission power output from the modulation / transmission means 23 only to the transmission / reception antenna 21, prevents leakage to the reception / demodulation means 24, and receives the high-frequency signal obtained by the transmission / reception antenna 21 only from the reception demodulation means 24. Have a role to communicate to.

The operation of the wireless communication apparatus configured as described above will be described below.
The voice uttered by the user of the wireless communication device is converted into an electric signal by the microphone 25, further modulated by the modulation transmission means 23, amplified to a required transmission power, and then supplied to the transmission / reception antenna 21 via the duplexer 22. Is done.

  From the transmission / reception antenna 21, a radio wave modulated by the voice of the user of the wireless communication device is radiated. Let the frequency of the radio wave at this time be fa.

  On the other hand, a radio wave having a frequency ft flying from the outside is captured by the transmission / reception antenna 21, demodulated into an audio signal by the reception demodulator 24 via the duplexer 22, and then becomes sound by the speaker 26. The user can perceive it as the other party's voice.

  If the other party of the call uses a wireless communication device having the same configuration, and the transmission frequency of the other party's wireless communication device is set to ft and the reception frequency is set to fa, the other party's voice is transmitted as a radio wave of frequency ft. And played as sound by our radio. At the same time, our voice is transmitted as the frequency fa and reproduced as sound by the other party's wireless communication device. That is, it is possible to make a simultaneous call in which the voices are received while sending each other.

  The above is the operation of simultaneous calling between two parties, but simultaneous calling of three or more parties is also possible. When three or more parties make a simultaneous call, it is necessary to go through a wireless repeater.

Hereinafter, the operation of the wireless repeater shown in FIG. 5 will be described.
In FIG. 5, reference numeral 7 denotes a receiving antenna that captures radio waves radiated into space and converts them into high-frequency signals. Reference numerals 1, 2 and 3 denote reception demodulation means for demodulating a high frequency signal having a predetermined frequency from the high frequency signals obtained by the transmission / reception antenna 7 and converting them into audio signals. In the example of FIG. 5, it is assumed that the reception demodulating means 1 receives and demodulates a radio wave of frequency f1a, the reception demodulating means 2 of frequency f2a, and the reception demodulating means 3 of frequency f3a. The frequencies f1a, f2a, and f3a are different from each other.

  Reference numeral 4 denotes a mixer for adding the outputs of the reception demodulation means 1, 2 and 3. A modulation transmission means 6 is connected to the output of the mixer 4 and converts the audio signal added by the mixer 4 into a signal of a format that can be transmitted as a radio wave, and amplifies it to a power necessary for radiating as a radio wave. A transmission antenna 8 radiates high-frequency power into space during transmission. At this time, the frequency of the radio wave radiated from the transmission antenna 8 is assumed to be ft.

The operation of the wireless repeater configured as described above will be described below.
Radio waves having frequencies f1a, f2a, and f3a are captured by the receiving antenna 7, demodulated into audio signals by the receiving demodulation means 1, 2, and 3, and then added by the mixer 4. The output of the mixer 4 is modulated by the modulation transmission means 6, amplified to a required transmission power, and then supplied to the transmission antenna 8. The transmitting antenna 8 radiates as a modulated radio wave that is the sum of the voices of the users of the three radio communication devices included as modulation signals in the three radio waves of the reception frequencies f1a, f2a, and f3a. . At this time, the frequency of the radio wave radiated from the transmission antenna 8 is ft.

  FIG. 6 is an operation explanatory diagram in the case where three wireless communication devices shown in FIG. 4 are used and a simultaneous call between three parties is performed via the wireless relay device shown in FIG.

  Reference numerals 31, 32, and 33 denote wireless communication devices shown in FIG. 4, and the transmission frequencies of the respective wireless communication devices are f1a, f2a, and f3a. The reception frequencies of the wireless communication devices 31, 32 and 33 are all the same and ft. Reference numeral 34 denotes a wireless repeater shown in FIG. 5. The reception frequencies of the wireless repeater 34 are f1a, f2a, and f3a, and the transmission frequency of the wireless repeater 34 is ft.

  Each voice signal transmitted by the wireless communication devices 31, 32, and 33 is synthesized by the wireless relay device 34 and then radiated from the transmission antenna 8 of the wireless relay device 34 as a radio wave of the frequency ft to perform wireless communication. The radio waves of the reception frequency ft reach each of the devices 31, 32, and 33, and the synthesized voices of the three parties are output from the speakers of all three wireless communication devices. Therefore, transmission and reception between three parties can be performed simultaneously.

However, in the configuration as described above, the number of wireless communication devices capable of simultaneous communication is equal to the number of reception demodulation means built in the wireless relay device 34.
(1) After the wireless repeater is completed as a product, the number of wireless communication devices that can make simultaneous calls cannot be increased.
(2) Increasing the number of receiving and demodulating means built in the radio repeater 34 can increase the number of radio communication devices that can make simultaneous calls, but this increases the cost and is extra in the case of simultaneous calls with a small number. The cost of the reception demodulating means is wasted.
It had the problem that.

  The present invention solves the above problems and provides a wireless repeater that can theoretically increase the number of wireless communication devices that perform simultaneous calls by connecting a plurality of wireless repeaters wirelessly. It is in.

  In order to solve the above problems, a wireless repeater of the present invention includes a plurality of reception demodulation means for receiving radio waves and demodulating an audio signal, and a demodulated signal output by the plurality of reception demodulation means. A mixer for adding, a modulation transmission means for modulating an audio signal and transmitting it as a radio wave, and one reception frequency shared by a plurality of wireless communication devices as the first transmission frequency of the modulation transmission means, Frequency setting means capable of setting the reception frequency of one reception demodulating means in one radio repeater other than the station as the second transmission frequency of the modulation transmission means, and the first and second transmission frequencies And a switch capable of selecting.

In the wireless repeater of the present invention, the voice signal obtained by adding the output signal of the reception demodulating means is modulated and transmitted as the reception frequency of one reception demodulating means inside another wireless repeater by the above-described configuration.
(1) Even after the wireless repeater is completed as a product, the number of wireless communication devices capable of simultaneous communication can be increased infinitely.
(2) The reception demodulating means incorporated in the radio repeater is a minimum number, and the cost of the extra receiving demodulation means is not wasted even in the case of simultaneous calls with a small number.
(3) No mechanical connection means for signal transmission between wireless repeaters is required.

DESCRIPTION engaged to an embodiment of the present invention will be described 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 radio repeater according to an embodiment of the present invention. FIG. 2 is a block diagram when two wireless repeaters shown in FIG. 1 are connected and connected by radio. Further, FIG. 3 is a diagram for explaining the operation in the case where six wireless communication apparatuses shown in FIG. 4 are used, and two persons shown in FIG. It is.

  1, components having the same reference numerals as those in FIG. 5 are exactly the same in function and operation, and thus description thereof is omitted.

In FIG. 1, reference numeral 9 denotes an additional reception demodulating unit, and the output of the reception demodulating unit 9 is connected to the mixer 4. The reception frequency of the reception demodulator 9 is different from f1a, f2a, and f3a, and is set to another frequency described later. Reference numeral 10 denotes frequency setting means, which stores two frequencies ft and fs. Reference numeral 5 denotes a switch. When the switch 5 is connected to the contact T, the frequency setting means 10 sets the transmission frequency of the modulation transmission means 6 to ft. When the switch 5 is connected to the contact S, the frequency setting means 10 sets the transmission frequency of the modulation transmission means 6 to fs.
The operation of the wireless repeater configured as described above will be described below with reference to FIG.

  In FIG. 1, radio waves having frequencies f1a, f2a, and f3a are captured by a receiving antenna 7, demodulated into audio signals by receiving demodulation means 1, 2, and 3, and then added by a mixer 4. This operation is exactly the same as the operation of the radio repeater shown in FIG. 5, but the audio signal demodulated by the reception demodulating means 9 is also added to the mixer 4 at the same time.

When the switch 5 is connected to the contact T, the output of the mixer 4 is modulated by the modulation transmission means 6, amplified to a required transmission power, and then supplied to the transmission antenna 8. This operation is also exactly the same as the operation of the wireless repeater shown in FIG. 5, except that three wireless communications are included as modulation signals in three radio waves of reception frequencies f1a, f2a and f3a from the wireless transmission antenna 8. and the audio signal of the user of the machine, the sum of the audio signal demodulated by the receiving demodulation means 9 is radiated becomes modulated radio waves. At this time, the frequency of the radio wave radiated from the transmission antenna 8 is assumed to be ft. The reception frequency of the reception demodulating means 9 is different from any of f1a, f2a, and f3a. Therefore, when three parties make a simultaneous call, if one radio repeater shown in FIG. 1 is used, the radio repeater shown in FIG. Exactly the same operation.

  On the other hand, when the switch 5 is connected to the contact S, the transmission frequency of the modulation transmission means 6 is fs, so that the radio communication devices 31, 32 and 33 shown in FIG. 6 do not receive this radio wave.

  Next, the operation of the wireless repeater when 6 persons make simultaneous calls will be described with reference to FIG. In FIG. 2, the reason why “a” and “b” are added after the reference numerals of the constituent elements is to distinguish the two wireless repeaters as the wireless repeater 11a and the wireless repeater 11b. The same components as those of the repeater are exactly the same as the components of FIG.

  In FIG. 2, 11 a and 11 b are the same as the wireless repeater shown in FIG. 1, and the switch 5 a of the wireless repeater 11 a is connected to the contact S. Therefore, the transmission frequency of the modulation transmission means 6a of the wireless repeater 11a is fs1. The switch 5b of the wireless repeater 11b is connected to the contact T. Therefore, the transmission frequency of the modulation transmission means 6b of the wireless repeater 11b is ft. Further, here, it is assumed that the reception frequency of the reception demodulating means 9b of the radio repeater 11b is set to the transmission frequency fs1 of the radio repeater 11a.

The operation of the wireless repeater configured as described above will be described below with reference to FIG.
Radio waves of frequencies f1a, f2a, and f3a are captured by the receiving antenna 7a, demodulated into audio signals by the receiving demodulation means 1a, 2a, and 3a, and then added by the mixer 4a. Since the switch 5a is connected to the contact S, the transmission frequency of the modulation transmission means 6a is fs1, and the radio wave of the frequency fs1 is radiated from the transmission antenna 8a of the radio repeater 11a.

  A radio wave of frequency fs1 using a signal obtained by adding the voices of the users of the three radio communication devices having the transmission frequencies f1a, f2a, and f3a as a modulation signal is captured and received by the reception antenna 7b of the radio repeater 11b. After being demodulated into an audio signal by the demodulator 9b, it is input to the mixer 4b.

  The reception antenna 7b of the radio repeater 11b captures three radio waves having different frequencies f1b, f2b and f3b, is demodulated into audio signals by the reception demodulation means 1b, 2b and 3b, and then added by the mixer 4b. The Since the mixer 4b also adds the signal demodulated by the reception demodulator 9b at the same time, the output of the mixer 4b is included in the six radio waves of the reception frequencies f1a, f2a, f3a and f1b, f2b, f3b as modulation signals. The sum of the audio signals of the users of the six wireless communication devices is output.

  Since the switch 5b of the radio repeater 11b is connected to the contact T, the output signal of the mixer 4b is input to the modulation transmission means 6b, and the frequencies f1a, f2a, f3a and f1b, f2b, f3b are transmitted from the transmission antenna 8b. Radio waves are generated by modulating a signal obtained by adding the voices of the users of six radio communication devices included in the six radio waves as modulation signals. The frequency of the radio wave radiated from the transmission antenna 8b at this time is ft.

FIG. 3 shows a case where six wireless communication devices shown in FIG. 4 are used and two wireless relay devices shown in FIG. 1 are connected in a wireless connection in the connection state shown in FIG. FIG.
Reference numerals 31, 32, 33 and 41, 42, 43 denote wireless communication apparatuses shown in FIG. 4, and the transmission frequencies of the respective wireless communication apparatuses are f1a, f2a, f3a and f1b, f2b, f3b. The reception frequencies of the wireless communication devices 31, 32, 33 and 41, 42, 43 are all the same and ft.

  Reference numerals 11a and 11b denote the wireless repeater 11a and the wireless repeater 11b shown in FIG. 2, respectively, and the frequency of the radio wave radiated from the transmission antenna of the wireless repeater 11a is fs1.

  The reception frequencies of the wireless repeater 11a are f1a, f2a, and f3a, and the reception frequencies of the wireless repeater 11b are f1b, f2b, f3b, and fs1. A radio wave having a transmission frequency ft is radiated from the transmission antenna 8b of the wireless repeater 11b.

  Each voice signal transmitted to the wireless communication devices 31, 32, and 33 is synthesized by the wireless relay device 11a, and then radiated as a radio wave of frequency fs1 from the transmission antenna 8a of the wireless relay device 11a. The signal is demodulated into an audio signal by the reception demodulating means 9b of the wireless repeater 11b shown in FIG. 2 via the reception antenna 7b of the wireless repeater 11b, and then transmitted to the mixer 4b. Each voice signal transmitted to the wireless communication devices 41, 42, 43 is added by the wireless relay device 11b and simultaneously demodulated by the reception demodulation means 9b of the wireless relay device 11b shown in FIG. The audio signal is also added.

  Therefore, as a result, the respective audio signals transmitted to the wireless communication devices 31, 32, 33 and 41, 42, 43 are radiated as radio waves of the frequency ft from the transmission antenna 8b of the wireless repeater 11b. Is done.

  The radio waves transmitted from the radio repeater 11b reach the radio communication devices 31, 32, 33 and 41, 42, 43 as radio waves of the reception frequency ft, respectively. Synthetic speech is output. Therefore, transmission and reception are performed simultaneously among the six parties, and simultaneous calls between the six parties are possible.

  Further, if the frequency setting means 5b of the wireless repeater 11b in FIG. 2 is connected to the contact S and a third wireless repeater is added, simultaneous communication among nine parties becomes possible. In this case, the added third wireless repeater may set the transmission frequency of the modulation transmission means to ft and the reception frequency of the reception demodulation means 9 to fs2.

Furthermore, when this setting is expanded and the wireless repeater is connected in n-stage wireless connection,
(1) The radio repeater 1 does not matter the reception frequency of the reception demodulation means 9 and the transmission frequency is set to fs1. (2) The radio repeater 2 sets the reception frequency of the reception demodulation means 9 to fs1 and the transmission frequency to fs2 ( 3) The radio repeater 3 sets the reception frequency of the reception demodulation means 9 to fs2, and the transmission frequency to fs3. (4) The radio repeater n sets the reception frequency of the reception demodulation means 9 to fs (n-1). In theory, the number of simultaneous calls can be increased indefinitely.

As described above, according to the present embodiment, a plurality of reception demodulation means for receiving radio waves and demodulating an audio signal, and the respective demodulation signals output by the plurality of reception demodulation means are added. A mixer, a modulation transmission means for modulating an audio signal and transmitting it as a radio wave, and one reception frequency shared by a plurality of wireless communication devices as the first transmission frequency of the modulation transmission means; Selecting frequency setting means capable of setting the reception frequency of one reception demodulating means in one radio repeater as the second transmission frequency of the modulation and transmission means, and the first and second transmission frequencies. By providing a switch capable of performing transmission, the audio signal obtained by adding the output signal of the reception demodulation means is modulated and transmitted as the reception frequency of one reception demodulation means inside another radio repeater.
(1) Even after the wireless repeater is completed as a product, the number of wireless communication devices capable of simultaneous communication can be increased infinitely.
(2) The reception demodulating means incorporated in the radio repeater is a minimum number, and the cost of the extra receiving demodulation means is not wasted even in the case of simultaneous calls with a small number.
(2) No mechanical connection means for signal transmission between wireless repeaters is required.

  In the embodiment, the switch 5 is switched manually. Needless to say, a similar function can be realized by a program such as a microcomputer.

  Further, since the plurality of wireless repeaters are installed at a short distance from each other, the radio wave having the transmission frequency fs may be weak. Therefore, it is obvious that the convenience of the wireless repeater in which the switch 5 is set to S is further improved if the transmission power is automatically reduced.

Block diagram of a wireless repeater showing an embodiment of the present invention Block diagram when two wireless repeaters are connected wirelessly Operation explanatory diagram when two of the same wireless repeaters are connected in a wireless connection and a simultaneous call is made between six parties Block diagram of a general wireless communication device for simultaneous calls Block diagram of a conventional wireless repeater Operation explanatory diagram when performing simultaneous call between three parties with a conventional wireless repeater

Explanation of symbols

1-3, 9 Reception demodulation means 4 Mixer 5 Switch 6 Modulation transmission means 10 Frequency setting means

Claims (1)

  A radio repeater that uses two or more units simultaneously, a plurality of reception demodulation means (1) (2) (3) (9) for receiving radio waves and demodulating audio signals, and the plurality of reception demodulations A mixer (4) for adding the respective demodulated signals output by the means, a modulation transmission means (6) for modulating the audio signal and transmitting it as a radio wave, and one shared by a plurality of wireless communication devices The reception frequency is set as the first transmission frequency of the modulation transmission means, and the reception frequency of one reception demodulation means in one other radio repeater other than the own station is set as the second transmission frequency of the modulation transmission means. A radio repeater comprising: a frequency setting means (10) capable of selecting a first frequency and a switch (5) capable of selecting the first and second transmission frequencies.

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