JPH0761039B2 - Relay function addition device for portable radio - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay function adding device for a portable wireless device, which can be inserted between existing portable wireless devices to easily automatically relay mutually received signals. It is about.

[0002]

2. Description of the Related Art The use of a portable wireless device is convenient because it can be moved anywhere, but the communication distance is short, so the radio wave cannot reach because it is too far to the place you want to communicate or there is an obstacle on the way. There are many. In such a case, it would be advantageous if the relay of the portable wireless device could be performed automatically and easily. However, generally, mass-produced portable wireless devices are not considered for relaying.

Therefore, in order to perform relaying using such a portable wireless device, a signal (squelch information) for suppressing noise during standby of the receiving section is taken out by modifying the wireless device and then other Relaying is performed by using as a signal for transmission control of a portable wireless device, or by detecting a rising of a voice of a reception output and using this as a transmission control signal (voice activation method).

[0004]

As a method for relaying between portable radios, it is necessary to repair the radios in the above-mentioned method of extracting squelch information and controlling transmission.
In particular, a wireless device made for such a purpose is not suitable for mass production, and thus has a drawback of being expensive.

Further, in the case of the voice activation method described above, the rise of the detection output for detecting the received voice signal is always delayed as compared with the generation start time of the caller. However, there is a drawback that it is difficult to hear the content of the call. Furthermore, in order to solve this drawback, there is a method of temporarily recording a voice signal in a storage device and delaying the time to relay it, but not only the device becomes complicated, but also the delay in the call causes a dialogue between callers. There is a drawback that it cannot be performed smoothly.

The object of the present invention is to eliminate such drawbacks,
An object of the present invention is to provide a relay function addition device for a portable wireless device that enables a good call without a call disconnection or delay with a simple device without repairing the portable wireless device.

[0007]

In order to achieve the above object, the present invention detects a change in impedance of a reception output terminal when a portable radio changes from a standby state to a reception state, and relays and transmits. A reception output impedance detection circuit used as a transmission control signal of the portable wireless device to be attempted, and a portable wireless device transmitting section that amplifies a low frequency signal appearing at the reception output terminal and adjusts it to an appropriate level for relay transmission. The audio signal adjusting circuit for outputting as the audio input of is provided.

[0008]

1 is an explanatory diagram showing a relay system in only one direction of a relay function adding device 3 according to an embodiment of the present invention. As shown in FIG. 1, the portion that performs the relay function in one direction is configured by the reception output impedance circuit 4 and the audio signal adjustment circuit 5.

In FIG. 1, the A portable radio 1 to which the third embodiment is connected comprises a transmitting section 1a and a receiving section 1b, and the reception output impedance circuit 4 and the audio signal adjusting circuit of the third embodiment are the receiving section 1b. Is connected to the audio output terminal S ₁ . In addition, the B portable wireless device 2 for performing relay transmission includes the transmitting unit 2a.
The output of the reception output impedance detection circuit 4 of the third embodiment is connected to the press talk control terminal P ₂ of the transmitter 2a, and the output of the audio signal adjustment circuit 5 is the audio input of the transmitter 2a. It is connected to the terminal M ₂ .

FIG. 2 is an explanatory diagram for explaining the operation principle of the relay function addition device 3 of FIG. As shown in FIG. 2, the reception output impedance detection circuit 4 is composed of a pilot transmission control circuit 4a and a pilot signal detection circuit 4b, and its connection point is connected to the audio output terminal S ₁ of the reception section 1b of the portable wireless device. It The audio signal conditioning circuit 5 includes a high-pass filter and an amplifier and is also connected to the audio output terminal S ₁ . In this embodiment, 6 is an input terminal,
Reference numerals 7 and 8 denote output terminals, which are the same as the parts having the same reference numerals in FIG.
The low frequency output IC 11 is connected to the audio output terminal S ₁ of the receiver 1b.
Is connected, and X _c is the line reactance of the output of IC11.

The squelch (noise control) operation for suppressing the noise generated during the standby of the portable radio is performed by the low frequency output IC 11
This is done by turning on and off the power of the switch circuit 13. The output impedance of this IC11 is
0 when the power of IC11 is on (squelch is off)
~ 4 ohms, a few kilo-ohms when off (squelch is on). Therefore, if this large impedance change is taken out as a direct current change, it can be used as squelch information for controlling the transmission of the portable wireless device for relay transmission.

In the present invention, the change of the low frequency output impedance of the receiving section 1b (change of the impedance at the audio output terminal S ₁ ) of the pilot signal (the output signal of the pilot transmission control circuit 4a) added from the outside of the receiving section is used. It is taken out as a change in transmission level, converted into an ON / OFF signal by the pilot signal detection circuit detection 4b, and output from the output terminal 7 as squelch information. The frequency of the pilot signal may be determined outside the modulation frequency band of the portable wireless device, and may be determined in consideration of the influence of the line reactance 12 of the output of the IC 11, and in this embodiment, it is set to 100 hertz. Since the output impedance of the IC 11 is irrelevant to the low frequency output level, there is no malfunction due to the volume difference of the voice output of the portable wireless device. Further, since the pilot signal is not necessary for the transmission of the voice signal such as the call contents, the voice signal adjusting circuit 5 first removes the pilot signal by the high-pass filter and then amplifies it to a predetermined level by the amplifier and outputs it. Output from 8.

Although only one-way relay has been described above, two-way relay is actually required. 3 and 4 show the appearance of an embodiment of the present invention having a bidirectional relay function, FIG. 3 is a front view, and FIG. 4 is a rear view. FIG. 5 shows FIG.
5 is a system diagram showing a circuit configuration example of the embodiment shown in FIG.

In FIG. 3, reference numeral 14 is a power switch, 15 is a power indicator lamp, 16 is a switch for disconnecting relay, 17 is a knob for adjusting the volume of the speaker for monitoring by this apparatus, and 18 is a call interruption from this apparatus. A knob 19 for selecting a portable wireless device to be transmitted in the case of performing the above is a microphone / speaker connection plug. In FIG. 4, 20 is a plug for external power supply, 21a is a connection cord for A portable radio device, 22 is a receiving balance knob for eliminating the volume difference between A and B portable radio devices when monitoring, and 21b is B. This is a dedicated connection code for mobile wireless devices.

In FIG. 5, reference numeral 30 denotes a 100-Hz oscillator, which corresponds to the pilot transmission control 4a shown in FIG. 2 and is common to two-way relay. The band pass filter 32, the switch circuit 33, and the relay 34 output the squelch information of the portable radio A, and the pilot signal detection circuit 4 of FIG.
It corresponds to part b. Reference numeral 35 is for removing the pilot signal mixed in the audio output of the portable radio A in the apparatus and adjusting the level to be the audio input of the transmitter of the portable radio B, which corresponds to the audio signal adjustment circuit 5 in FIG. To do. Similarly, the band pass filter 42, the switch circuit 43, and the relay 44 output the squelch information of the B portable radio device, and 45 removes the pilot signal mixed in the voice output of the B portable radio device and adjusts the level to A. It is used as an input to the portable wireless device and also corresponds to the pilot signal detection circuit 4b and the audio signal adjustment circuit 5 in FIG.

Reference numeral 21a denotes a plug for connecting the portable wireless device A and this device, S ₁ is a voice output terminal, M ₁ is a microphone input terminal (transmitter voice input terminal), and P ₁ is a press talk switch drive terminal. . Reference numeral 21b denotes a plug for connecting the portable wireless device B to this device, S ₂ is a voice output terminal, M ₂ is a microphone input terminal (transmitting section voice input terminal), and P ₂ is a reply talk switch.

Next, the relay operation of this embodiment will be described. In FIG. 5, for example, when the portable wireless device A changes from the standby state to the reception state, the impedance of the terminal S ₁ becomes low. Input of the continuous output of the transmitter 30 of the originating state is divided by the impedance of the resistor 31 and the terminal S ₁ to the band-pass 32 is reduced, whereby the switching circuit 33 drives the relay 34, the ry ₁ The contact is closed, the press talk drive terminal P ₂ is connected to the earth, and the portable radio B is changed from the standby state to the transmission state.

The low-frequency signal such as the voice appearing at the terminal S ₁ is removed by the voice signal adjusting circuit 35 by the high-pass filter by removing the output of the low-level oscillator 30 mixed through the resistor 31. At the same time, the modulated signal of the portable radio is amplified to an appropriate level and output to the terminal M ₂ . Since the terminal M ₂ is connected to the modulation input circuit of the portable radio B, its contents are relayed.

When the call ends and the impedance of the terminal S ₁ rises, the operation of the relay 34 stops and the grounding of the terminal P ₂ is released, so that the portable radio B returns from the transmitting state to the standby state.

When the portable radio B is changed from the standby state to the receiving state, the impedance of the terminal S ₂ is lowered and the relay 44 operates in the same manner to connect the terminal P ₁ to the earth and the portable radio A. Change the machine from the standby mode to the transmission mode. The audio signal is transmitted through the audio signal adjusting circuit 45 to the terminal M ₁
Through A to the modulation signal input circuit of the portable wireless device.

As shown in FIGS. 3 to 5, the monitor circuit is composed of the connector 19 provided in the apparatus, the amplifiers 51 and 52, and the relay 54.

The output of the receiver output from the A portable radio device or the B portable radio device is amplified by the amplifier 51 via the audio signal adjusting circuit 35 or 45, is connected to the external speaker terminal S ₃ of this apparatus, and is not shown in the monitor. Sound the speaker.

When an interrupt call is made, a press talk switch (not shown) attached to the microphone is pressed to connect the terminal P ₂ to the earth, so that the relay 54 operates and the relay contact r
y ₃ closes. Since Q ₁ and Q _{2 in} FIG. 5 are preselected and either one or both of them are grounded, the one (or both) of the grounded press talk drive terminals P ₁ or P ₂ or P ₁ P ₂ is connected to the earth, and the portable radio device corresponding to it is in the transmission state.

The voice signal of the interrupted call is input from a terminal M ₃ connected to an external microphone (not shown), amplified by an amplifier 52 and passed through relay contacts ry ₃ and ry ₃ to the A portable radio device and the B portable radio device. Since it is connected to the terminals M ₁ and M ₂ which are connected to the modulation signal input circuit, its contents are transmitted from the portable wireless device in the transmission state.

FIG. 6 is a reference diagram showing an example of a concrete circuit of the main part of the relay function adding device of the present invention shown in FIG. In FIG. 6, reference numeral 60 is a pilot oscillation control circuit.
2a, and 61 and 62 are pilot signal detection circuits for transmitting squelch information in both directions, respectively, and correspond to 4b in FIG. Since the circuits 61 and 62 are completely the same, the circuit 62 is not shown. The resistors 31, 41, the relays 34, 44, the terminals S ₁ , S ₂ are shown in FIG.
Is the same as

[0026]

As described in detail above, the relay function adding device for a portable wireless device of the present invention performs relay transmission by utilizing the impedance change of the low frequency output circuit due to ON / OFF of the squelch of the receiver. Since the portable wireless device is switched to the transmission state, the contents of the call are always transmitted after the transmission state is set, the call is not cut off, and there is no delay in the call. Further, since all the input / output terminals of this embodiment need only be connected to the external plugs of the existing portable wireless device, there is no need to repair the existing portable wireless device or develop a new portable wireless device.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a one-way relay system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining an operation principle of the relay function adding device 3 of FIG.

FIG. 3 is a front view (outside view) of an embodiment of the present invention having a bidirectional relay function.

FIG. 4 is a rear view (outside view) of the embodiment of FIG.

5 is a system diagram showing a circuit configuration example of the embodiment of FIG.

6 is a diagram showing a specific circuit example of a main part of the relay function adding device of FIG.

Claims (1)

[Claims] 1. A relay function addition device for a portable wireless device for relaying a signal received by one portable wireless device using a plurality of portable wireless devices and transmitting the signal from the other portable wireless device, wherein the one portable device A reception output impedance detection circuit that detects a change in the output impedance of a terminal that outputs a voice signal to the outside of the wireless device and outputs the detected output as a transmission control signal that causes the other portable wireless device to switch between transmission and reception. And a voice signal adjusting circuit for inputting the voice signal, adjusting the signal level thereof, and outputting the voice signal as a voice input of the transmitting unit of the other handheld radio device. apparatus.