JPH0438607Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> This invention is a wireless communication device that facilitates operation in retransmission request mode.

<Conventional technology> Conventionally, in a one-way wireless communication device, using a car-mounted wireless communication device as an example, a mobile station (mounted in the car) operates a telephone connected to a base station (fixed station). Conventionally, this required the following operations.

While pressing Press Talk Switch 1 (hereinafter referred to as PTT switch), press the phone number of the person to call 12 Microphone with switch (hereinafter referred to as 12-key microphone)
Dial using 12 key switch 3 of 2.

Release PTT switch 1 and listen to the ring tone.

If the person you dialed does not pick up the handset, the handset will automatically switch to receive mode after about 30 seconds and the ringer will disappear, so either press PTT switch 1 again or press the retransmission request switch on 12-key microphone 2, e.g. *Press button switch 4 to request retransmission.

The person you dialed picked up the handset and
For example, "Hello, ○○, please..."
When the answer is uttered and there is no sound for about 2 seconds after the utterance is finished, the communication device automatically switches to receive mode, and both stations switch to receive mode. At this time, if you wish to continue transmitting from the other party (base station), press PTT switch 1 on the mobile station side or press * button switch 4 on the 12-key microphone 2, and a signal tone will be output to the receiver of the other party. hand,
The other party can continue sending since it will notify you that it is in retransmission request mode. When the other party ends the call, both stations enter the receiving mode, as described above.

At that time, the mobile station presses PTT switch 1 and says, for example, ``This is △△, but...''
please. ” to send it to the other party.

<Problems to be solved by the invention> In this way, by repeating , , the conversation can be continued, but among the above operations, when the mobile station requests retransmission, In addition to operating the vehicle, the * button switch 4 on the 12-key microphone 2 must be pressed, which is dangerous, especially when driving at high speeds, as the hands cannot be devoted to operating the steering wheel during this time.

<Means for Solving the Problems> The configuration of the present invention, which aims to simplify such operations, will be explained with reference to the embodiments shown in FIGS. 1 and 2. In a telephone radio communication device, the output terminal of a waveform shaping circuit 15, which is turned on and off as the capacitor 6 is charged and discharged, which is controlled by the signal generated by the off operation of the pre-talk switch 1, is set to a retransmission mode. *This is a wireless communication device connected in parallel to button switch 4.

<Effect> This idea does not require such extra steps,
When PTT switch 1 is released (turned off), the same electrical input as when *button switch 4 of 12-key microphone 2 is pressed is automatically input, and the communication device switches to retransmission request mode. This is a wireless communication device equipped with a shaping circuit 15 and a 12-key microphone 2.

<Example> An example of this invention shown in FIG. 1 will be described below.

That is, in the conventional example shown in FIG.
Since switch 1 is directly connected to ground, as mentioned above, when entering the retransmission request mode, in addition to operating PTT switch 1,
Press the * button switch 4 on key switch 3,
I had to turn it on.

This invention involves inserting a waveform shaping circuit 15 as shown in the diagram surrounded by dotted lines and having an input on the ground connection side of the PTT switch 1 as shown in Fig. 1, and converting the output to 12
Connect in parallel to the circuit of *button switch 4 of microphone 2 with key button switch to generate a rising pulse from ON to OFF of PTT switch 1 (Figure 2 5)
By using this, the * button switch 4 circuit of the 12-key switch 3 is automatically turned on temporarily by discharging the capacitor 6.

The waveform shaping circuit 15 provided in this invention is
One end (+ pole) of a capacitor 6 is connected to the ground side end of the PTT switch 1, the other end is connected to the base of a transistor 7 whose emitter is grounded, the collector of the transistor 7 is connected to one end of the power switch 16 through a resistor 8, and the collector of the transistor 7 is connected to one end of the power switch 16. Furthermore, the emitter and collector outputs are connected via a resistor 12 to the base of a transistor 9 connected to both ends of the * button switch 4 of the 12-key switch 3, respectively. Furthermore, the resistor 10 is connected to the ground side of the power switch 16,
A resistor 11 is connected between the base of the transistor 7, PT
Each is connected between the ground side of switch 1 and the ground. In this way transistors 7 and 9
amplifies the charging/discharging signal of the capacitor 6 to generate an on/off signal between the emitter and collector of the output transistor 9.
Send as off output.

In such a case, turn on PTT switch 1, release PTT switch 1 after the mobile station has finished transmitting, and turn it off. At that moment, capacitor 6
The PTT switch end was charged to (+) and the other end was charged to (-), but now capacitor 6 is charged.
The PTT switch side is grounded and the capacitor 6 is discharged.

A discharge current flows through the resistor 10 → the resistor 11, and the potential of the base of the transistor 7 becomes low, and the transistor 7 is turned off. When it happens,
The output transistor 9 is turned on between its collector and emitter, and turned off when the capacitor 6 finishes discharging. Therefore, when the * button switch 4 of the 12-key switch 3 is turned off by releasing the PTT switch 1, it is turned on while the capacitor 6 is being discharged, and the communication device enters the retransmission request mode.

Although the * button has been described above as a retransmission request switch button, the same applies to other buttons.

Although the embodiments considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments. It can be implemented with appropriate modification within the scope of achieving the following effects.

<Effects of the invention> As described above, this invention controls the charging and discharging of the capacitor 6 by using the rising signal of the off operation of the press talk switch 1, and accordingly,
This is a wireless communication device that simplifies the operation of displaying the retransmission request mode by turning on the output terminal of the waveform shaping circuit 15, which turns on and off. can be much reduced.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the main part of this invention, FIG. 2 is a time chart showing the operation of this invention, and FIG. 3 is a circuit diagram of a conventional example. In the figure, 1 is a press talk switch, 3 is a 12-key button switch, 4 is a * button switch, 6 is a capacitor, and 15 is a waveform shaping circuit.

Claims (1)

[Claims for Utility Model Registration] In a one-way radio communication device, the output of a waveform shaping circuit 15 that is turned on and off as the capacitor 6 is charged and discharged, which is controlled by a signal generated by turning off the press talk switch 1. 12-key button switch 3 to reveal retransmission mode
A wireless communication device connected in parallel to. The other end of the capacitor 6 connected to the ground side terminal of the press talk switch 1 is connected to the base of a transistor 7 whose emitter is grounded, and the collector of the transistor 7 is connected to the 12-key button switch 3 with the collector and emitter connected in parallel. The wireless communication device according to claim 1, which is connected to the base of the transistor 9.