JPH0795111A - Specific small power transceiver - Google Patents

Abstract

PURPOSE:To provide the specific small power transceiver by which a radio connection time is reduced and it is easily recognized from whom received communication comes. CONSTITUTION:A settled squelch number is stored in a microcomputer 10. A DTMF generator 14 generates a DTMF signal integrating the squelch number to provide it as a transmission signal. A tone squelch signal is sent from a tone squelch 13, the DTMF signal and the tone squelch signal are superimposed and a channel is scanned by a channel changeover circuit 20 and the superimposed signal is sent via an antenna 23 from a transmission circuit 21. A carrier discrimination circuit 24 receives a carrier via the antenna 23 and a reception circuit 22 while being subject to channel scanning by the channel changeover circuit 20. When the microcomputer 10 discriminates the squelch number to be coincident with the squelch number from a DTMF receiver 15, the microcomputer 10 allows a speaker 17 to sound a voice and reads picture character information and displays the information on a display device 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a system for automatically searching for an assigned channel by using a DTMF signal which is a dial signal having a high frequency, and a system for performing pictogram communication by combining the DTMF signal with a specified small size. Regarding power transceivers.

[0002]

2. Description of the Related Art At present, a wireless connection means in a specific low power transceiver is used in a low frequency band (30) outside a voice band at a transmitting station.
(0 Hz or less) is modulated and transmitted at a specific frequency, and the receiving station performs the wireless connection operation only by so-called tone squelch, which detects the frequency during demodulation and opens the speaker mute.

In addition, there is no model that adopts pictographic communication for the current specific low power transceiver.

[0004]

The wireless connection operation by tone squelch is effective for a station that later participates in a call, for example, because the squelch signal is always sent during a call, the power is turned on with a delay. However, since a low-frequency tone is used, it takes a long time to detect a tone. Therefore, the conventional specific low power transceiver has a problem that it takes a long time (200 to 300 msec) to perform a wireless connection operation.

Further, there is no means for knowing who sent the communication during or after the call.

The present invention was devised in view of the above circumstances, and provides a specific low power transceiver which can shorten the wireless connection time and can easily know from whom the communication is sent. The purpose is to provide.

[0007]

A first specific low power transceiver according to the present invention comprises means for generating a DTMF signal in which a squelch number is combined with a channel fixing instruction signal in the initial stage of a wireless connection operation, and a tone squelch signal. A means for transmitting after channel-scanning the DTMF signal, a means for determining whether or not the squelch number included in the DTMF signal when a carrier from the partner station is received, and a speaker when they match. And means for operating the.

The second specific low-power transceiver according to the present invention has means for pre-registering a plurality of pictographic information, and means for selecting pictographic information corresponding to the sender at the initial stage of wireless connection operation. A means for generating and transmitting a DTMF signal that combines selected pictographic information, a means for reading the pictographic information included in the DTMF signal when a carrier from the partner station is received, and a display for the read pictographic information And means.

[0009]

According to the first specific low power transceiver, the squelch number combined with the DTMF signal having a frequency higher than that of the tone squelch signal is detected.
The wireless connection time is shortened.

According to the second specific low power transceiver, the pictogram information corresponding to the sender is transmitted by being carried on the DTMF signal and the pictogram information is displayed on the receiving station side. It is possible to easily confirm whether the communication has been made.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a specific low power transceiver according to the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing the electrical construction of a specific low power transceiver of the embodiment. In FIG.
Reference numeral 10 is a microcomputer (hereinafter, abbreviated as a microcomputer), 11 is an operation unit such as a keyboard, 12 is a display device such as a liquid crystal display device, 13 is tone squelch, and 14 is D.
TMF generator, 15 DTMF receiver, 16 speaker amplifier, 17 speaker, 18 microphone, 19
Is a microphone amplifier, 20 is a channel switching circuit, 21 is a transmitting circuit, 22 is a receiving circuit, 23 is an antenna, and 24 is a carrier determination circuit.

The microcomputer 10 includes an operation unit 11, a display device 12, a tone squelch 13, and a DTMF generator 1.
4, the DTMF receiver 15, the channel switching circuit 20, and the carrier determination circuit 24 are connected. A speaker 17 is connected to the tone squelch 13 via a speaker amplifier 16, and a microphone 18 is connected to the tone squelch 13 via a microphone amplifier 19. Tone squelch 13 and D
The TMF generator 14 is connected in common and is also connected to the transmission circuit 21, and the tone squelch 13 and the DTMF are also connected.
The receiver 15 is commonly connected to the receiving circuit 22, the channel switching circuit 20 is connected to the transmitting circuit 21 and the receiving circuit 22, the transmitting circuit 21 and the receiving circuit 22 are connected to the antenna 23, and the carrier determining circuit 24 is connected. Is connected to the receiving circuit 22.

Next, the operation of the specific low power transceiver having the above configuration will be described. FIG. 2 is a timing chart showing the operation of the transmitting station and the operation of the receiving station.

First, the squelch number is determined by mutual agreement between the specific low power transceiver on the transmitting station side and the specific low power transceiver on the receiving station side, and the squelch number is input from the operation unit 11 to the microcomputer 10. Remember.

While waiting for a set, the microcomputer 10 sends a channel designation signal to the channel switching circuit 20 to switch the channel switching circuit 20 one by one in the assigned channel to detect a carrier (scan).

Immediately before transmission, the transmitting station uses the operation unit 11 and the display device 12 to select a pictogram stored in advance in the ROM of the microcomputer 10. Next, when the transmission is instructed by the operation unit 11, the microcomputer 10 gives an instruction to the channel switching circuit 20 to fix the channel being scanned. The reception circuit 22 receives the radio wave input from the antenna 23 and sends it to the carrier determination circuit 24. The carrier determination circuit 24 determines the presence / absence of a carrier, and when it determines that there is a carrier, transmission on that channel cannot be performed.
Specify 0 to match the next assigned channel. When it is determined that there is no carrier, the channel is a free channel that is not used and can be used. Therefore, after fixing the channel, the wireless connection operation starts.

In the wireless connection operation in the transmitting station, first, an ID determined by law is sent by FSK (frequency shift keying) or MSK (minimum shift keying), and then the microcomputer 10 corresponds to a preset squelch number. Tone squelch 13 and DTMF so that the tone squelch signal and the DTMF signal are transmitted.
Give instructions to the generator 14. Here, the tone squelch signal is a conventional squelch signal that uses a low frequency outside the voice band, and is always transmitted during transmission. On the other hand, the DTMF signal is a signal that is transmitted within the initial limited time when the wireless line is connected, and is followed by a channel fixing instruction signal for fixing the channel being scanned by the receiving station for the time being. It consists of squelch number / emoji information. For pictograms, the selected pictogram data is superimposed by the microcomputer 10 immediately before transmission. The squelch signal is output from the tone squelch 13 as a low frequency component outside the voice band, and is also output from the DTMF generator 14 as a voice band component, and after being combined,
It is transmitted from the antenna 23 via the transmission circuit 21.

FIG. 3 is a flowchart showing the operation of the receiving station, and the operation of the receiving station will be described below with reference to this flowchart.

When the receiving station receives a radio wave while scanning a channel (standby) (step S1), the carrier determining circuit 24 determines whether or not there is a carrier from the antenna 23 via the receiving circuit 22 (step S1). S2).
When it is determined that there is no carrier, the microcomputer 10 gives an instruction to the channel switching circuit 20 to scan the next assigned channel (steps S2 to S1). When it is determined that there is a carrier, the microcomputer 10 fixes the channel, the tone squelch 13 and the DTMF receiver 1
Wait for the determination result of 5 (steps S3 and S4).

The microcomputer 10 includes a tone squelch 13 and a D
When it is determined that one of the TMF receivers 15 matches the squelch number set first by the own station, the speaker amplifier 16 is operated and sound is emitted from the speaker 17 (step S7). When it is determined that both the tone squelch 13 and the DTMF receiver 15 differ from the set squelch number, the microcomputer 10 gives an instruction to the channel switching circuit 20 to scan the next assigned channel (steps S4 to S1).

Considering the frequencies of the tone and the DTMF signal, since the tone has a low frequency and the DTMF signal has a high frequency, the DTMF signal is fixed before the channel is fixed by the tone detection, as shown in FIG. The channel is fixed by the detection. Therefore, the wireless connection time can be shortened (80 to 100 msec) as compared with the conventional tone squelch.

Further, the squelch number / picture character information following the channel fixing instruction signal of the DTMF signal is DTMF.
When decoded by the receiver 15 (step S5), the squelch information and the pictogram information are also read and sent to the microcomputer 10 to display the pictogram previously stored in the microcomputer 10 on the display device 12 (step S5).
6).

As described above, since the squelch number combined with the DTMF signal having a frequency higher than that of the tone squelch signal is detected, the wireless connection time can be shortened and the pictogram set on the transmitting station side can be displayed on the receiving station side. Therefore, it is possible to easily determine who has sent the communication.

[0025]

According to the first specific low power transceiver of the present invention, since the high frequency DTMF signal is used for the channel scan, the wireless connection time can be shortened.

Further, according to the second specific low power transceiver of the present invention, the pictogram information transmitted by being carried on the DTMF signal is displayed on the receiving station side, so that it is easy to identify from whom the communication is transmitted. You can check.

[Brief description of drawings]

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

FIG. 2 is a timing chart showing the operation of the transmitting station and the operation of the receiving station in the embodiment.

FIG. 3 is a flowchart showing the operation of the receiving station in the embodiment.

[Explanation of symbols]

 10 ... Microcomputer 11 ... Operation part 12 ... Display device 13 ... Tone squelch 14 ... DTMF generator 15 ... DTMF receiver 16 ... Speaker amplifier 17 ... Speaker 18 ... Microphone 19 ... Microphone amplifier 20 ... Channel Switching circuit 21 ... Transmission circuit 22 ... Reception circuit 23 ... Antenna 24 ... Carrier determination circuit

Claims (2)

[Claims] 1. A DT in which a squelch number is combined with a channel fixing instruction signal in the initial stage of a wireless connection operation.
A means for generating an MF signal, a means for transmitting a DTMF signal together with a tone squelch signal after channel scanning, and a DTM when a carrier from a partner station is received.
A specific low power transceiver comprising: a means for determining whether or not the squelch number included in the F signal matches, and a means for operating a speaker when the squelch number matches. 2. A means for pre-registering a plurality of pictographic information, a means for selecting pictographic information corresponding to a sender in the initial stage of wireless connection operation, and a DTMF signal generated by combining the selected pictographic information. Specific small electric power, characterized by including means for transmitting the pictogram information included in the DTMF signal when receiving a carrier from the partner station, and means for displaying the pictogram information read. transceiver.