JPH06152468A - Specified small power class transceiver - Google Patents

Abstract

PURPOSE:To notify a call from an opposite side station regardless of the setting of receiver volume. CONSTITUTION:This device is provided with a call signal generating means 77 for generating a call signal 171 at the time of sending a carrier detecting signal 141 from a carrier detecting means 14. The call signal 171 is guided through a signal path, which is different from the signal path through a volume setter 16, to a voice amplifier circuit 21 for ringing a speaker 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a specific low power transceiver which causes a speaker to emit a ringing tone when a receiving circuit receives a radio wave.

[0002]

2. Description of the Related Art A specific low power transceiver used in various fields of short-range communication is capable of communicating at a volume corresponding to the environment in which it is used. By using a variable resistor, the volume can be adjusted to an optimum level. Therefore, the user of the specific low-power transceiver adjusts the variable resistor to adjust the volume at which the communication from the partner station can be clearly heard in accordance with the degree of noise in the surroundings.

[0003]

However, in the above-mentioned specific low power transceiver, the call from the partner station can only be known by the voice of the partner station transmitted from the speaker. Therefore, if you take out the specified small power transceiver that was used in a quiet place around the design room and bring it to a noisy place around the construction site and forget to change the volume setting, Since the volume setting is the same as the volume setting in a quiet place, there was a situation where the call from the other station was missed.

The present invention was devised to solve the above problems, and an object thereof is to provide a specific low power transceiver which can notify a call from a partner station irrespective of the reception volume setting. is there.

[0005]

In order to solve the above problems, in the specified low power transceiver of the present invention, the receiving circuit receives a radio wave based on a signal indicating the intensity of the received radio wave transmitted from the receiving circuit. Carrier detecting means for sending out a carrier detecting signal indicating that, a calling signal generating means for sending out a calling signal based on the carrier detecting signal sent out from this carrier detecting means, and a calling signal sent out from this calling signal generating means And an audio amplifier circuit for amplifying the signal and sending it to the speaker.

[0006]

When the receiving circuit receives the radio wave and the carrier detecting signal is sent from the carrier detecting means, the calling signal generating means gives the calling signal to the voice amplifying circuit and the speaker outputs the calling sound. That is, the ringing signal transmitted from the ringing signal generating means is guided to the voice amplification circuit by a signal path different from the signal path through the volume setting device for adjusting the call voice (reception volume), so that the speaker outputs from the speaker. The volume of the ringing tone transmitted is always a constant volume regardless of the setting of the volume setting device.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an electrical configuration of an embodiment of a specific low power transceiver according to the present invention.

In the figure, the output of the transmitting circuit 12 is guided to the antenna 11, and the output from the antenna 11 is given to the receiving circuit 13. In addition, in the transmission circuit 12,
The output of the microphone 20 is guided through the amplifier 15.

The audio signal 131 output from the receiving circuit 13 is given to the volume setting device 16, and the audio signal transmitted from the volume setting device 16 is the audio amplification circuit 2.
It is introduced into one of the inputs of 1. This audio amplifier circuit 2
A ringing signal 171 from the ringing signal generating means 17 is introduced into the other input of 1. The output of the audio amplification circuit 21 is given to the speaker 22.

Further, the signal from the receiving circuit 13 is given to the carrier detecting means 14, and the carrier detecting means 14 is provided.
The carrier detection signal 141 which is the output of the above is sent to the main controller 18. Then, the output from the main control unit 18 is guided to the calling signal generating means 17, and the output of the transmission switch 19 is given to the main control unit 18. In addition, the transmission circuit 1
The output from the main controller 18 is introduced into both the receiver 2 and the receiver circuit 13.

The receiving circuit 13 receives the radio wave captured by the antenna 11, sends a signal indicating the intensity of the radio wave to the carrier detecting means 14, and outputs a voice signal 131 indicating the received voice to the volume setting device 16. It is a block that outputs to.

Further, the transmission circuit 12 is a block for transmitting a high frequency signal, which is modulated by a voice signal from the microphone 20 amplified by the amplifier 15, as a radio wave from the antenna 11.

Further, the carrier detecting means 14 sends a carrier detection signal 141 to the main control section 18 when the receiving circuit 13 receives the radio wave in accordance with the signal indicating the strength of the received radio wave sent from the receiving circuit 13. It is a block.

The volume setting device 16 is composed of a variable resistor that can be operated from outside the transceiver body.
Is a block that attenuates the level of the audio signal 131 output from the reception circuit 13 to a level corresponding to the setting and outputs the attenuated audio signal to the audio amplification circuit 21.

When the main control unit 18 indicates that the carrier detection signal 141 has been transmitted, the calling signal generating means 17 is a calling signal 171 which is a voice band signal of several hundred Hz.
To generate. Then, it is a block for sending the generated calling signal 171 to the voice amplifier circuit 21 (the sending period of the calling signal 171 is 1 second).

Further, the voice amplifier circuit 21 includes a volume setting device 1
6 is a block that not only amplifies the voice signal sent from the signal No. 6 but also the call signal 171 from the call signal generating means 17 and gives the amplified two types of signals to the speaker 22.

The main control section 18 is mainly composed of software executed by a microcomputer, and controls the operation of the transmission circuit 12 and the reception circuit 13 according to the operation of the transmission switch 19. And so on,
It is a block that performs various controls required for communication.

FIG. 2 is a flow chart showing the main operation of one embodiment of the present invention. The operation of one embodiment of the present invention will be described below with reference to FIG.

The receiving circuit 13 receives the set channel and sends a signal indicating the strength of the received radio wave to the carrier detecting means 14, but when the partner station does not transmit to this channel, the strength is changed. Since the level of the signal shown is low, the carrier detection means 14 does not send out the carrier detection signal 141. Therefore, step S1
The operation enters the standby state in which the operations of 1 and S12 are repeated.

When the partner station starts transmission to the set channel in this state, the radio wave from the partner station is received by the receiving circuit 13.
Is received by the carrier detection means 14 and a signal indicating its intensity is given to the carrier detection means 14. Therefore, the carrier detection means 1
4 sends a carrier detection signal 141 to the main controller 18.

The main control section 18 to which the carrier detection signal 141 is given gives an instruction to start the operation to the calling signal generating means 17 on the assumption that the transmission from the partner station has started (step S13). Therefore, the calling signal generating means 17
Generates a ringing signal 171 according to the given instruction,
The generated calling signal 171 is output to the voice amplification circuit 21.

The ringing signal 171 is transmitted through the signal amplifying circuit 2 via a signal path that is not related to the setting of the volume setting device 16.
Therefore, even if the volume setting device 16 is set to a low volume, the speaker 22 outputs a ringing tone with a sufficient volume (step S1).
4).

Thereafter, under the control of the main controller 18, the receiving circuit 13 and the transmitting circuit 12 operate in response to the operation of the transmitting switch 19 and communication is performed (step S15).

In this communication, in order to make the voice from the partner station the optimum volume corresponding to the surrounding conditions, the setting of the volume setting device 16 can be changed if necessary.

The present invention is not limited to the above embodiment,
The period during which the calling signal generation means 17 sends the calling signal 171 is set to 1 second, but it can be set to any other period, for example, 2 seconds.

Regarding the calling signal 171, the number 10 is given.
Although the case where the audio band signal of 0 Hz is used has been described, it is possible to use a signal in the audible frequency band of any other arbitrary waveform.

[0028]

The specific low power transceiver according to the present invention is provided with the ringing signal generating means for transmitting the ringing signal when the carrier detecting means transmits the carrier detecting signal, and the ringing signal generated by this ringing signal generating means is The volume of the ringing tone sent from the speaker is always constant because it is guided to the voice amplification circuit that makes the speaker ring by a signal path different from the call voice signal path. Therefore, there is an effect that the call from the partner station can be notified regardless of the setting of the reception volume (call voice).

[Brief description of drawings]

FIG. 1 is a block diagram showing an electrical configuration of an embodiment of a specific low power transceiver according to the present invention.

FIG. 2 is a flowchart showing the main operation of one embodiment of the present invention.

[Explanation of symbols]

 13 reception circuit 14 carrier detection means 16 volume setting device 17 ringing signal generation means 21 voice amplification circuit 22 speaker 141 carrier detection signal 171 ringing signal

Claims (1)

[Claims] 1. A carrier detection means for transmitting a carrier detection signal indicating that the reception circuit has received a radio wave based on a signal indicating the intensity of the received radio wave transmitted from the reception circuit, and the carrier detection means. A calling signal generating means for sending a calling signal based on the sent carrier detection signal; and a voice amplifying circuit for amplifying the calling signal sent from the calling signal generating means and sending it to a speaker. Specific low power transceiver.