JPH066254A - Wireless device - Google Patents

Abstract

PURPOSE:To provide a radio equipment in which an outside microphone can be allowed to have both a speech transmitting function and an emergency transmitting function by one signal line. CONSTITUTION:This device is equipped with a microphone device 100 constituted of a microphone unit 1 which prepares a voice signal according to an inputted voice, press-to-talk switch 3 which supplies a power source of a prescribed voltage to the microphone unit by a pressing operation, and emergency calling switch 4 which short-circuits an output terminal 100b which outputs the voice signal with a reference voltage according to the operation, radio equipment main body 200 constituted of a voltage detector 10 which detects the direct current voltage of an input terminal 200b, and microprocessor unit 12 which controls the transmission of the voice signal or an emergency command signal according to the detected voltage obtained from the voltage detector 10, and transmission cable 13 which transmits the voice signal transmitted from the microphone device to the radio equipment main body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless device having an emergency call switch on the outside.

[0002]

2. Description of the Related Art FIG. 2 shows the configuration of a conventional wireless device. In FIG. 2, reference numeral 100 denotes an external microphone unit, and 20
Reference numeral 0 is a radio main body. The external microphone unit 100 has an output terminal 100a, and is connected to the input terminal 200a of the wireless device main unit 200 via the cable 5 with a 3-core connector. In the external microphone unit 100, 1 is a microphone unit that receives a voice and converts it into a voice signal, and 2 is a pull-down resistor connected in parallel to the microphone unit 1.
3 is a press talk switch that is pressed during a call, and 4
Is an emergency call switch for issuing an emergency command. 5
Is a cable with a three-core connector that connects the output terminal 100a of the external microphone unit 100 and the input terminal 200a of the radio main unit 200, and is a ground wire, a signal line for voice signals, and a signal line for emergency call signals. The voice signal and the emergency call signal are transmitted via separate signal lines. Further, in the wireless device main body 200, 6 is a pull-up resistor connected to the audio signal line, 7 is a coupling capacitor for relaying an AC component of the audio signal, and 8 is an amplifier for amplifying the audio signal to the next stage. It is an audio amplifier to supply.

Reference numeral 9 is a pull-up resistor connected to the emergency call signal line, 10 is a voltage detector for detecting the DC voltage of the voice signal line, and 11 is connected to the output terminal of the voltage detector 10. A pull-up resistor 12 is a voltage detector 10
Receive the detection signal from the low active PTT input,
It is a microprocessor unit (hereinafter referred to as "MPU") that receives an emergency call signal at a low active ENG input. The threshold voltage of ENG input is about 0.7.
It is V.

Next, the operation of the above conventional example will be described. First, while the switch 3 is open, the DC voltage at the point A, which is the input of the voltage detector 10, is pulled up by the pull-up resistor 6
As a result, the power supply voltage (3.5 V in this case) is at the same high level as Vcc. The voltage detector 10 is a comparator that outputs a high-level signal when the input DC voltage exceeds the threshold voltage (3V in this case). Therefore MP
The low active input PTT of U12 also becomes high level, and the standby state is maintained without switching to the call communication mode.

On the other hand, when the switch 3 is closed, the voltage at the point A becomes a divided voltage (about 2.7V in this case) by the pull-up resistor 6 and the pull-down resistor 2, and the output of the voltage detector 10 becomes low. It becomes a level. Therefore, MPU
The PTT input of 12 also becomes low level, and the mode is switched to the call communication mode. At the same time, the audio signal collected by the microphone unit 1 is guided to the audio amplifier 8 via the coupling capacitor 7.

On the other hand, while the switch 4 is open, the input EMG of the MPU 12 is 3.
The DC voltage is 5V, that is, the high level, and the standby state is maintained without switching to the emergency communication mode.

When the switch 4 is closed, the input EMG of the MPU 12 becomes the ground voltage, that is, the low level.
This causes the radio to switch to the emergency communication mode.

As described above, in the above-described conventional microphone device, it is possible to switch to the transmission mode corresponding to each by the press talk switch and the emergency call switch.

[0009]

However, since the signal lines controlled by the press talk switch and the emergency call switch are independent of each other in the wireless device of the above conventional example, the wireless device main body part and the external microphone part are separated from each other. It was necessary to have an independent core wire for each cable to be connected. For this reason, there is a limit to the number of pins of the external output connector on the radio unit side, the main unit has an emergency call function, and the external microphone does not have this function for the radio unit configured There was a problem that it could not be implemented in some cases, such as when an emergency call function was added to the external microphone side.

The present invention solves such a conventional problem, and is an excellent wireless device in which an external microphone can have both a call transmission function and an emergency transmission function with a single signal line. Is provided.

[0011]

In order to achieve the above object, the present invention provides a microphone unit for generating an audio signal in accordance with an input voice, and a power source of a predetermined voltage supplied to the microphone unit by a pressing operation. A microphone device provided with a press talk switch, an emergency call switch that short-circuits an output end that outputs a voice signal to a reference voltage in response to an operation, a detection unit that detects a DC voltage at the input end, and the detection unit It is composed of a radio main body having a control means for controlling the transmission of a voice signal or an emergency command signal according to the obtained detection voltage, and a transmission cable for transmitting the voice signal sent from the microphone device to the radio main body. It is composed.

[0012]

Therefore, according to the present invention, by closing the press talk switch during a call, the DC voltage at the input end becomes a predetermined voltage higher than the reference voltage, and the detecting means detects this and the MPU which is the control means. Input port (PT
By reversing T) to the low level, the wireless device is switched to the call communication mode.

Further, by closing the emergency call switch, the DC voltage at the same input terminal as described above becomes the ground potential which is the reference voltage, and by inverting the input port (EMG) of the MPU to the low level, the wireless Machine switches to emergency communication mode.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of a radio apparatus according to the present invention.

In FIG. 1, reference numeral 100 denotes an external microphone unit, which is a microphone device, and components having the same configurations as those in FIG. 2 are denoted by the same reference numerals. Further, reference numeral 200 denotes a radio unit main body, which includes a voltage detector 10 as a detection means and an MPU 1 as a control means.
2. Other components having the same configurations as those in FIG. 2 are represented by the same reference numerals.
In FIG. 2, the output terminal 100 of the external microphone unit 100 is shown.
b and the input terminal 200b of the wireless device main body 200 are two terminals, and the cable 13 connecting them is a two-core connector-equipped cable. Further, the switch 4, which is an emergency call switch for the external microphone unit, is connected to the voice signal line. That is, the emergency call signal is supplied to the ENG input of the MPU 12 by the voice signal line.

Next, the operation of the above embodiment will be described.
When the switch 3 is opened, the pull-up resistor 6 generates a Vcc voltage on the signal line and leads it to the input of the voltage detector 10. At this time, the DC voltage at the point A, which is the input of the voltage detector 10, is 3.5V due to the pull-up resistor 6.
It is next high level. Since the input DC voltage exceeds the threshold voltage of 3 V, the voltage detector 10 supplies a high level signal to the PTT input of the MPU 12 and maintains the standby state without switching to the call communication mode.

On the other hand, when the switch 3 is closed, the voltage at the point A is divided by the pull-up resistor 6 and the pull-down resistor 2 to about 2.7V, the threshold voltage becomes 3V or less, and the output of the voltage detector 10 becomes low. It becomes a level. Therefore, MP
The PTT input of U12 also becomes low level, and the mode is switched to the call communication mode. At the same time, the audio signal collected by the microphone unit 1 is transferred to the audio amplifier 8 via the coupling capacitor 7.
Be led to. Also, in this case, while the switch 4 is open, the ENG input of the MPU 12 is also 2.7V.
Since the threshold voltage is 0.7 V, the high level state is maintained and the emergency communication mode is not switched.

On the other hand, when the switch 4 is closed, the MPU
The 12 EMG inputs are at a ground voltage, ie, a low level, which is a reference voltage of 0.7 V or less. This causes the radio to switch to the emergency communication mode.

As described above, according to the above-described embodiment, by providing the common signal line in which the DC voltage component is changed by both the press talk switch and the emergency call switch, one signal is provided. With the line, both the call transmission state and the emergency transmission state can be activated, and an external microphone can be realized.

[0020]

The present invention has the following effects, as is apparent from the above-mentioned embodiments.

By providing a common signal line whose direct current voltage component is changed by both the press talk switch and the emergency call switch, one signal line can be used for both the call transmission state and the emergency transmission state. It is possible to realize a wireless device that activates.

In the case where the radio main body side has the emergency call function but the external microphone side does not have the function, and there is a request for the external microphone side to be provided later. Also, the emergency call function can be added without changing the terminals provided on the wireless device main body and the external microphone, and the cables connecting the both.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a wireless device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional wireless device.

[Explanation of symbols]

 1 Condenser Microphone unit (microphone unit) 2 Pull-down resistor 3 External press talk switch 4 External emergency call switch 5 Cable with 3-core connector 6 Pull-up resistor 7 Coupling capacitor 8 Audio amplifier 9 Pull-up resistor 10 Voltage detector 11 Pull-up resistor 12 Microprocessor-unit (MPU) 13 Cable with 2-core connector

Claims (1)

[Claims] 1. A microphone device having a function of issuing an emergency command to input a voice, a transmission cable for transmitting an audio signal sent from an output end of the microphone device, and an input end connected to the cable. A wireless device comprising a wireless device body that modulates and transmits the audio signal, wherein the microphone device includes a microphone unit that generates an audio signal according to the input audio, and a microphone unit that is pressed by a pressing operation. A press talk switch for supplying a power source of a predetermined voltage and an emergency call switch for short-circuiting the output end for outputting the audio signal to a reference voltage in response to an operation are provided, and the wireless device main body has a direct current of the input end. A detection means for detecting the voltage; and a control means for controlling the transmission of the voice signal or the emergency command signal according to the detection voltage obtained from the detection means. Wireless device that the butterflies.