JPH11145894A - Radio equipment with repeating function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand a communication available area, when communication staff of mobile station radio equipment fixed on a vehicle or the like is away therefrom in a press talk communication with a common transmission/reception frequency. SOLUTION: Speaking at a frequency f1 from a base station is received directly by portable radio equipment 3 carried by a communication staff away from a mobile station 2, and when that communication staff is to perform transmission to a base station 1, transmission is performed in a radio wave of a frequency f2 from the portable radio equipment 3 to a reception-only radio repeater 30 of frequency f2 installed at the mobile station 2. Voices are recognized by the radio repeater 30, which receives the radio wave at the frequency f2, and transmitted from the mobile station 2 to the base station at the frequency f1 under the control of a control part 25, which detects the demodulated audio signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless relay apparatus for easily expanding a usable range of a wireless device fixed in a vehicle or the like in wireless communication.

[0002]

2. Description of the Related Art Conventionally, press-talk wireless communication is
This is a communication method in which an opposing radio device performs communication by switching between transmission and reception alternately.In general, transmission and reception are performed using the same frequency, and base stations for business radio, amateur radio, etc. -Used for various purposes such as portable mobile stations. FIG. 3 is an example of a conventional press-talk wireless communication system, and is a configuration example of a combination of a base station 1 and a mobile station 4 mounted on a vehicle. In the figure, a base station 1 includes an antenna 11 for transmitting and receiving radio waves, an antenna switch 12 for switching the connection of the antenna 11, a transmitting unit for modulating a carrier wave with a voice or data signal and transmitting the modulated wave to the antenna 11. 13, a receiving section 14 for demodulating a signal received by the antenna 11, a control section 15 for performing signal processing of an audio signal or a data signal, a microphone 16 for converting audio to an electric signal, and a speaker 17 for converting an audio electric signal to audio. And a press switch 18 for switching the wireless device between a transmission state and a reception state. On the other hand, mobile station 4
Also, the antenna 41, the antenna switching unit 42, the transmission unit 43,
It comprises a receiving unit 44, a control unit 45, a microphone 46, a speaker 47, and a press switch 48, and the functions of the components are the same as those of the base station 1.

[0003] Communication between the base station 1 and the mobile station 4 is performed using f1 of the same frequency for both transmission and reception. When transmitting from the base station 1 to the mobile station 4, the base station 1 uses a press switch 17.
Is pressed, the antenna switching unit 12 connects the antenna 11 to the transmission unit 13. As a result, the voice or data signal of the base station communicator input from the microphone 16 is modulated in the transmission unit 13 and emitted from the antenna 11 as a modulated wave of the transmission frequency f1. Transmitted frequency f
The one radio wave is received by the mobile station 4. In the mobile station 4, when the press switch 48 of the mobile station 4 is not pressed, the antenna switch 42 is connected to the receiving unit 44, and the radio signal of the frequency f 1 transmitted from the base station 1 is transmitted to the antenna 41. , And input to the receiver 44 through the antenna switch 42. The received radio wave is demodulated into an audio band by the receiving unit 44 and signal-processed by the control unit 45.
It is output as a voice or a code from the speaker 47. When transmitting from the mobile station 4 and receiving at the base station 1, communication is performed in the same procedure.

[0004]

However, in a mobile station (vehicle-mounted radio) of the press-talk system configured as described above, for example, when a call is made from a base station, voice output from a speaker of the mobile station is transferred. It is limited to the range that the station radio communication staff can hear, and the transmission to the base station is limited to the range that the microphone code of the mobile station radio can reach,
Of course, the on-board radio is fixedly installed inside the car,
There is a problem that it cannot be used outside a vehicle outside the above range.
To solve the above problem, it is conceivable to use a mobile radio as a mobile station. However, in the case of a press-talk radio with a high output power of 5 W or more used for business, the radio itself has a large size. In addition, since a battery with a very large capacity is required, there is a problem that the whole becomes a large and heavy radio, which makes it difficult to carry. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides a wireless relay device that can easily expand the operable range of a fixed press-talk type wireless device such as a vehicle mounted vehicle with a simple configuration. The purpose is to:

[0005]

In order to solve the above-mentioned problems, in a radio relay apparatus according to the present invention, a radio having a specific frequency different from the transmission / reception frequency of the radio is received by a radio having a transmission / reception means. While having a possible relay receiving means, the radio unit can receive radio waves of the reception frequency of the radio unit, and has a standby radio unit capable of transmitting the radio waves of the specific frequency, from the standby radio unit A transmission signal is received by the relay receiving means of the wireless device main body,
It is characterized in that it is transmitted via the transmission means of the radio unit.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. FIG. 1 is a schematic configuration diagram showing one embodiment of a press-talk-type wireless communication system using a press-talk including a wireless device including a wireless relay device according to the present invention. As shown in FIG. 1, the present system includes a base station 1, a mobile station (in-vehicle wireless device) 2 having a wireless relay device, and a portable wireless device 3. The base station 1 includes an antenna 11, an antenna switch 12, a transmitting unit 1
3, receiving unit 14, control unit 15, microphone 16, speaker 1
7 and a press switch 18, and the mobile station 2
An antenna 21, an antenna switch 22, a transmission unit 23, a reception unit 24, a control unit 25, a microphone 26, a speaker 27, a press switch 28, a relay device antenna 29, and a wireless relay device 30. The transmission and reception between the base station 1 and the mobile station 2 are performed at the same frequency f1. In the portable wireless device 3, the reception frequency is set to f1, and the transmission frequency is set to f2 other than f1. In the above configuration, the functional operation of each constituent block of the base station 1 and the mobile station 2 is the same as that of the base station 1 of the related art except for the wireless relay device 30 of the mobile station 2, and the description is omitted.

FIG. 2 is a schematic structural diagram showing an example of an embodiment of the above-described radio relay apparatus 30. In the figure, reference numeral 29 denotes a relay device antenna capable of receiving a high-frequency radio wave of a frequency f2, and a radio relay device 30 includes a high-frequency low-noise amplifier 31 that amplifies a reception signal of the frequency f2 from the antenna 29 with low noise, A mixer 32 for frequency-converting the signal to an intermediate frequency band, a synthesizer 33 that oscillates a high-frequency signal and outputs the signal to the mixer 32, and demodulates the intermediate frequency signal to a voice band and outputs the demodulated signal to the control unit 25 of the mobile station 2. And a demodulation unit 34.

In the above configuration, the base station 1 and the mobile station 2
When a communication member of the mobile station 2 moves away from the mobile station 2 during communication between the mobile stations, the communication member carries the portable wireless device 3. The portable wireless device 3 receives the radio wave of the frequency f1 transmitted from the base station 1 like the mobile station 2. When the correspondent moves away from the mobile station 2 and responds to the base station 1, by pressing a press switch (not shown) of the portable radio 3 carried, the transmission becomes possible at the frequency f2. The transmission radio wave of frequency f2 emitted from the portable wireless device 3 is received by the relay device antenna 29 of the mobile station 2, demodulated into a voice band by the wireless relay device 30, and input to the control unit 25 of the mobile station 2. In the control unit 25, the wireless relay device 3
When the voice signal from 0 is detected, the press switch 28 of the mobile station 2 is automatically set to the pressed state by the detection signal. As a result, the antenna switch 22 switches the antenna 21
Is connected to the transmitting unit 23, and the demodulated voice or code from the portable wireless device 3 from the wireless relay device 30 is transmitted to the control unit 25.
, And is input to the transmission unit 23 and transmitted from the antenna 21 at the frequency f1.

As described above, when the communication member of the mobile station 2 moves away from the mobile station 2 and communicates with the base station 1 using the portable radio 3, the speaker circuit switch (not shown) of the mobile station 2 is turned on. Controlled by the operation of the press switch 28,
The transmission from the base station and the transmission from the portable wireless device 3 can be monitored by the mobile station 2. In addition, the portable wireless device 3
If the transmission frequency f2 is a frequency band that can be received by the antenna 21 of the mobile station 2, the antenna 29 can be omitted by sharing the antenna 21 for the mobile station and for the wireless relay apparatus. Further, in this embodiment,
Although the description has been given of the single-wave press-talk system for transmission and reception, it is needless to say that the present invention can also be applied to a two-wave press-talk wireless system having different transmission and reception frequencies or a simultaneous transmission and reception wireless communication system.

[0010]

As described above, according to the radio relay apparatus of the present invention, when a communication member of a mobile station that communicates with a base station leaves the mobile station, the third portable radio is carried and the mobile station is moved. Since it is configured to communicate with the base station via the above-described small and simple wireless relay device dedicated to reception installed in a station, for example, a specific low-power wireless device that does not need to license the third portable wireless device Accordingly, there is a remarkable effect that communication can be easily performed by expanding the range of use from the mobile station to a range of about 100 m in radius with a small size, light weight, low power consumption and good portability.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of an embodiment of a press-talk type wireless communication system including a wireless device including a wireless relay device according to the present invention;

FIG. 2 is a schematic configuration diagram showing an example of an embodiment of the wireless relay device in FIG. 1;

FIG. 3 is a schematic configuration diagram showing a configuration example of a conventional press-talk type wireless communication system.

[Explanation of symbols]

1. Base station 2. Mobile station according to the present invention
3. The portable wireless device according to the present invention, 4. Conventional mobile station, 11 Antenna, 12 Antenna switch, 13 Transmitter, 14 Receiver
15 control unit, 16 microphone, 1
7. Speaker, 18. Press switch 21. Antenna, 22. Antenna switcher,
23... Transmitting section, 24... Receiving section, 25... Control section, 26... Microphone, 27... Speaker, 28... Press switch, 29... Relay apparatus antenna, 30. ..High-frequency low-noise amplifier, 32..Mixer, 33..Synthesizer, 34..Demodulation unit

Claims (1)

[Claims] 1. A radio unit having transmission / reception means is provided with relay reception means capable of receiving radio waves of a specific frequency different from the transmission / reception frequency of the radio unit, while radio waves of a reception frequency of the radio unit are provided. Is receivable, and has a standby radio capable of transmitting the radio wave of the specific frequency, a transmission signal from the standby radio is received by the relay receiving means of the radio main body, and A wireless device with a relay function, wherein the wireless device is transmitted via a transmitting means of a wireless device main body.