JPH08107371A - Duplex radio communication equipment having forced termination function - Google Patents

Abstract

PURPOSE: To automate restart of speech without any operation after forced termination due to speech time-up in the duplex radio communication equipment having the forced termination function for the purpose of limiting a speech time. CONSTITUTION: A residual time of a specified speech time starts count-down in the step 1, the speech state is reached in the step 2, and its own voice is sent to an opposite party and whether or not a carrier from a talking opposite party is received is discriminated in the step 3, and when received, the voice of the opposite party is heard by a speaker 6 for talking. When a call termination button is not depressed and a remaining time in the speech time is within t1sec in the step 7, a specific tone signal is sent in the step 8, and when the frequency of the tone signal received in the step 9 is coincident with the frequency of its own equipment for a t2sec, the talking is continued and the transmission is stopped for a prescribed time in the step 11. Thus, when a carrier is idle by the carrier sense in the step 12, a calling name is sent in the step 13 to transit to talking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplex wireless communication device having a forced call termination function, and more specifically, prompt connection for restarting a call by forcibly ending the call due to exceeding a time limit specified by law. Regarding what you can do.

[0002]

2. Description of the Related Art In recent years, a duplex wireless communication device using different carrier frequencies for transmission and reception has been promulgated by the Ministry of Posts and Telecommunications as a kind of so-called specific low power transceiver in order to expand its use for personal communication. Is
Only devices that comply with legal regulations are on the market. As one of the standards, the device is obliged to have a call time limit means for preventing exclusive use of radio waves so that users can talk evenly. It is equipped with a forced call termination function that can end a call and resume the call after a certain transmission pause time. One of the methods for automatically restarting a call when the forced call termination function works is to automatically detect the transmission of digital data and the reception of digital data from the other party when the forced call termination function works. There is also a device on the market that reconnects the line and puts it in a call state.

Further, in recent years, the duplex wireless communication device has a finite number of carrier waves of frequencies legally assigned by the Ministry of Posts and Telecommunications because many people make telephone calls as the use thereof becomes more common. In some cases, carrier waves of the same frequency are used, causing interference. As one method to prevent interference, a tone amplifier unit that sends tone signals on the transmitting side and a tone squelch unit that detects tone signals on the receiving side are provided, and sound is output from the speaker only when the frequencies of the tone signals match. The method of doing is generally used.

An example of the above-described duplex wireless communication apparatus having a forced call termination function will be described below with reference to the drawings.

FIG. 4 is a flow chart for explaining the operation of the duplex wireless communication apparatus having the forced termination function of the prior art at the time of restarting a call. In FIG. 4, in step 40, the countdown of the remaining time of the limited call time is started, and in step 41, the call state after line connection is entered and one's own voice is transmitted to the other party. In step 42, it is determined whether or not the carrier wave from the other party is received, and when it is received, the other party's voice is heard from the speaker and the conversation is performed. Next, go to step 43, and when the conversation ends here and you want to stop the call, press the end button in step 43 to end the call in step 44, enter the standby state in step 45, and in step 42 call the other party. Also when it is determined that the carrier wave from is not received, the call ends in step 44 and the standby state is entered in step 45.

If the end call button is not pressed in step 43,
In step 46, it is judged whether or not the limited call time is exceeded, and if not, the process returns to step 41 to continue the call. If it is over, step 47
Go to and stop transmission for the specified time specified by law. After that, in step 48, it is determined whether or not a carrier having a frequency for transmitting a digital signal for line connection is vacant, and if another communication device has already transmitted, a standby state in step 45 is entered.

If it is free, in step 49, a digital signal for line connection is transmitted, the carrier wave is modulated, and the signal is transmitted from the transmitter. Then, in step 50, it is judged whether or not the digital signal from the partner communication device for making the line connection is received on the carrier wave of the frequency which is paired with the frequency for transmitting the digital signal for making the line connection, and must be received. For example, if it is in the standby state of step 45, if it receives, it returns to step 40, starts counting down the remaining call time, becomes the call state 41, and in step 42, it is judged again whether or not the signal from the other party is received. Follow the route. If the call duration limited in step 46 has not been exceeded, the state returns to the call state in step 41.

In FIG. 5, which is a flow chart for explaining the operation at the time of line connection for starting a call, step 51 is in a standby state, not called by the other party, and not being called by the other party. When calling the other party, by pressing the call start button in step 52,
In step 53, it is determined whether or not the carrier wave of the frequency to be transmitted is free, and if another communication device is transmitting, the process proceeds to step 58, an indication that the call cannot be made and a warning sound is output from the speaker. After informing me,
Return to the standby state of step 51.

When the carrier wave of the frequency to be transmitted is empty, the calling name defined by law is transmitted from the transmitting section in step 54, and subsequently, in step 55, a digital signal for calling the communication partner is transmitted. Then, the carrier wave is modulated and transmitted from the transmitting unit 4, and in step 56, a tone signal of a specific frequency is transmitted, the carrier wave is modulated and transmitted from the transmitting unit 4. Next, in step 57, it is judged whether or not a digital response signal from the other party is received in the carrier wave received,
If not received, the process returns to step 58. If so, it is determined in step 66 whether the frequency of the received tone signal matches that of the communication device (own station). If they do not match, the other party's voice is not output from the speaker 6 in step 67. The voice of the own communication device is transmitted, and the process returns to step 66. If they match, the voice of the other party is output from the speaker in step 68 and the voice of the own communication device is transmitted.
Start the countdown of the remaining call time at 9 and step 7
The call state becomes 0. The call state in step 70 corresponds to step 41 in FIG.

If the call start button has not been pressed in step 52, it is judged in step 59 whether the received digitel signal matches that of the own communication device. Return to the state. If they match, the process proceeds to step 60, a ringing tone is output from the speaker 6 to notify that the caller is called, and if the answer button in step 61 is pressed, if not pressed, the ringing tone is output in step 64. It is determined whether or not t3 seconds have continued, and if it continues, the output of the ringing tone is stopped in step 65, and then the process returns to the standby state of step 51. If not, the process returns to step 60, and the ringing tone is continuously output until the response button is pressed.

When the response button is pressed in step 61, the process proceeds to step 62, the output of the ringing tone is stopped, the response digital signal is transmitted and transmitted from the transmitting section, and then the tone signal of the specific frequency is transmitted in step 63. Then, it is transmitted from the transmitter. Next, at step 66, it is judged whether the frequency of the received tone signal matches that of the own communication device, and thereafter, the process is the same as the above-mentioned flow. In the call state,
The tone signal is constantly transmitted and detected, so that the tone amplifier unit 3 and the tone squelch unit 8 are always supplied with power and are operating.

[0012]

However, the duplex wireless communication device having the forced termination function of the conventional example as described above is not yet talked to, regardless of the user's willingness to continue talking. When the limited call time is exceeded, transmission and reception are stopped by the forced call termination function, after returning to the standby state once, the user must switch the switch again to restart the call and reconnect the line. However, it has a problem that it is not easy to use.

As a method of solving this, when the forced call termination function is activated, digital data is automatically transmitted, and reception of digital data from the other party is detected to reconnect the line. Although a device that puts a call in a call state is also available on the market, since a call is restarted after newly performing a line connection operation, for example, a frequency for transmitting a digital signal for making a line connection is already in another communication device. When it was used for a long time, it took a while until the call could be made again, and it was not possible to realize a continuous call that is as easy to use as a general telephone.

The duplex wireless communication device having the conventional forced call termination function as described above has been legally assigned by the Ministry of Posts and Telecommunications as many people make calls as the use of the device becomes more common. Due to the finite number of frequency carriers,
The carrier of the same frequency may be used repeatedly,
As one of the methods to prevent interference at that time, there is a tone amplifier section that sends tone signals on the transmitting side and a tone squelch section that detects tone signals on the receiving side, and only when the frequencies of the tone signals match. A method of outputting sound from a speaker is generally used, but since the tone amplifier and tone squelch section must always be supplied with power and kept in an operating state, current consumption increases and battery life shortens. Had.

The present invention has been made in order to solve the above-mentioned conventional problems. Tone signals are transmitted within a specific time period prior to forced call termination, and whether or not there is coincidence detection of the frequencies of the received tone signals. Provides a duplex wireless communication device having a forced call termination function that automatically resumes a call in a short time and allows a user to make continuous calls as easily as a general telephone without operating a switch. This is the first purpose.

Further, only when the line connection operation for starting a call is performed, the tone amplifier and the tone squelch section are set in the operating state, and the match detection of the frequency of the tone signal is performed in addition to the match detection of the digital signal, thereby interfering during the call. A second object of the present invention is to provide a duplex wireless communication device having a forced call termination function that prevents an increase in current consumption and that has a long battery life.
The purpose of.

[0017]

In order to achieve the above object, a duplex wireless communication apparatus having a forced call termination function of the present invention is provided.
A receiving unit that receives a carrier wave, a tone squelch unit that detects the frequency of the tone signal from the reception output of the receiving unit,
Within the first specific time (t1) immediately before the end of the limited communication time, a tone amplifier section for transmitting the frequency of the tone signal, a transmitting section for transmitting carrier waves of different frequencies paired with the received carrier wave, If there is no end switch input in
A tone signal of a specific frequency is transmitted from the tone amplifier unit, a carrier wave is modulated and transmitted from the transmitting unit, and a tone signal of a specific frequency is received from the carrier wave received from the other party by the receiving unit in the tone squelch unit. When the second specific time (t2) is detected within the first specific time (t1) immediately before the end of the limited communication time,
After the forced end of the call due to exceeding the time limit and stopping the transmission for the time specified by the law, perform the carrier sense operation specified by the law, and if the carrier with the strength above the specified is not detected for the specified time, After transmitting the call name from the transmitter, the transmitter again transmits a carrier wave having the same frequency as that before communication is stopped to start communication, and the tone squelch unit limits the carrier wave received from the other party. The first specific time (t
When the tone signal of the specific frequency cannot be detected for the second specific time (t2) within 1), the control unit is configured to stop the transmission / reception and enter the standby state.

In addition, the controller performs tone detection by detecting the coincidence of the frequency of the tone signal with the partner communication device in addition to the coincidence detection of the digital signal with the partner communication device only in the line connection operation for starting the communication. Power can be supplied to the tone amplifier section and the tone squelch section only when the amplifier section and the tone squelch section are operating.

[0019]

According to the present invention, in the duplex wireless communication apparatus having the forced call termination function, the control unit sends and receives the tone signal within the first specific time period prior to the forced call termination operation. Whether or not the call resuming operation is necessary is detected depending on whether or not the frequency coincidence is detected, and the transmission is stopped for the pause time defined in the regulation and the carrier sensing operation is performed to detect that the carrier is not used,
Further, the user who wants to continue the call can automatically resume the call in a short time without operating any switch.

Further, the control section activates the tone amplifier and tone squelch section only in the line connection operation for starting a call, and performs the coincidence detection of the frequency of the tone signal in addition to the coincidence detection of the digital signal. It prevents the interference of time, suppresses the increase of current consumption, and extends the battery life.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a duplex wireless communication apparatus having a forced call termination function of the present invention will be described in detail below with reference to FIGS.

FIG. 1 is a block diagram of a duplex wireless communication apparatus having a forced call termination function according to an embodiment of the present invention. In FIG. 1, a voice signal of a caller is input through a built-in microphone 1, amplified by a MIC AMP unit 2, and then a tone amplifier unit 3 oscillates a tone signal of a frequency designated by a control unit 11 to generate a MIC AMP. The signal is mixed with the signal input from the unit 2, is input to the transmission unit 4, modulates the carrier wave, and then is transmitted to the space by the antenna 5.

On the other hand, the antenna 5 accepts all carriers existing in space, but a specific frequency paired with the carrier frequency to be transmitted by the own communication device (own station), which is designated by the control unit 11. Only the carrier wave is received and amplified by the receiving unit 9, and the tone squelch unit 8 collates with the frequency of the tone signal designated by the control unit 11. If they match, the detection output is output to the control unit 11. Control unit 1
As a result, the AF AM is transmitted through the tone squelch portion 8
The signal is input to P7 and amplified, and the speaker 6 is driven and output as an audio signal. If the frequency of the tone signal checked by the tone squelch unit 8 and the frequency of the tone signal specified by the control unit 11 do not match, the detection output is not output to the control unit 11, and the control unit 11 thereby notifies the AF AMP 7. Muting is applied and no audio signal is output from the speaker 6.

It should be noted that the tone amplifier section 3 is always stopped by the control section 11 and the power is supplied only when the tone signal is sent. Similarly, in the tone squelch unit 8, the power supply is always stopped by the control unit 11 and the power is supplied only when the tone signal is received.

The end button 10 is a switch that is pressed when the call state is changed to the standby state, the call start button 12 is changed from the standby state to the state of calling the other party, and the response button 13 is pressed when the other party calls and answers. Is.

The operation of the duplex wireless communication apparatus having the forced call termination function configured as described above will be described below with reference to FIG. 2 which is a flowchart for explaining the operation when the call is restarted.

First, after the line is connected, in step 1, a countdown of the remaining time of the call time (for example, 3 minutes) defined by the law is started, and in step 2, the call state is established and one's voice is transmitted to the other party. . Here, in step 3, it is determined whether or not the carrier wave from the other party is received, and if it is received, the other party's voice is heard by the speaker 6 to make the conversation. When you're done talking and want to stop the call, step 4
When the end call button 10 is pressed at, the call ends at step 5, and the standby state is set at step 6. If the call end button 10 is not pressed in step 4 and the call is continued, it is determined in step 7 whether the remaining time is a set first specific time t1 second with respect to the call time limit. If not, return to step 2 to continue the call. When the remaining communication time is t1 seconds, in step 8, the tone signal of the specific frequency is transmitted from the tone amplifier unit 3 and the carrier signal is modulated by the tone signal from the transmission unit 4 and transmitted to the communication partner. Power supply to the tone amplifier unit 3 is always stopped by the control unit 11, and power is supplied only when a tone signal is transmitted. At the next step 9, the tone squelch unit 8 is asked whether the frequency of the tone signal included in the carrier wave received by the receiving unit 9 matches that of the own communication device for a preset second specific time t2 seconds. If they do not match, the call ends in step 5, and if they match, it is determined in step 10 whether the call is within the call time limit. In the tone squelch unit 8 as well, the power supply is always stopped by the control unit 11 and the power is supplied only when the tone signal is received. If it is within the call limit time, the process returns to step 8, and if it is not within the time, the process proceeds to step 11, and the transmission is stopped for the time defined by the law. Then step 1
At 2, the carrier sense operation specified by law is performed at the frequency used for the previous call (this is the operation that confirms that the carrier above a certain level of that frequency is not being transmitted), and this carrier is at the specified time. Determine if it was not sent (that is, not used by others),
If it is sent, it will be in standby state in step 8,
If not transmitted, the carrier wave is modulated by the calling name defined in the law in step 13 and transmitted from the transmission unit 4, and then the process returns to step 1 to reset the remaining call time,
Start a new countdown of the remaining time. Then, the call state in step 2 is entered, and the previous state is repeated.

Next, the line connection operation will be described with reference to FIG. 3, which is a flow chart for explaining the operation when the call is restarted. First, step 14 is in a standby state, in which the other party has not called and the other party has not called. Generally, in order to extend the battery life, intermittent operation is often performed to reduce current consumption.

When calling the other party from here, by pressing the call start button 12 in step 15, it is checked whether the carrier of the frequency to be transmitted has already been transmitted (used by another communication device). Judgment at 16. When it is being transmitted, the process proceeds to step 22, where it is displayed that the call cannot be made and a warning sound is output from the speaker 6 to notify the user, and then the process returns to the standby state of step 14. If not sent, step 17
After modulating the carrier wave with the calling name defined in the regulations and transmitting from the transmitting unit 4, in step 18, a digital signal for calling the other party is transmitted and the carrier wave is modulated and transmitted from the transmitting unit 4. In step 19, the tone signal of a specific frequency is transmitted, the carrier wave is modulated and transmitted from the transmission unit 4. Next, in step 20, it is judged whether or not there is a response digital signal from the other party in the carrier wave received by the receiving section 9, and if there is no response, the process goes to step 22. It is determined whether the frequencies of the signals match for t5 seconds.

If they do not match, go to step 22,
If they match, the transmission of the tone signal is stopped at step 32, the countdown of the remaining time of the limited call time is started at step 33, and the call state is set at step 34. The call state of step 34 corresponds to the call state of step 2 of FIG.

If the call start button 12 is not pressed in step 15, the process proceeds to step 23, and it is determined whether the calling digital signal which matches that of the own communication device is received. Returning to the standby state, if received, it is judged at step 24 whether or not it matches the frequency of the tone signal of the own communication device. If they do not match, the standby state of step 14 is entered, and if they match, the ringing tone of step 25 is output from the speaker 6. In the next step 26, it is determined whether or not the user has pressed the response button 13 in response to a call from the other party. If not pressed, the process proceeds to step 30 and the ringing tone is t3.
Determine if it rang for a second. If it is less than t3 seconds, the process returns to step 25 to output the ringing tone, and if t3 seconds, the process proceeds to step 31 to stop the ringing tone output and step 14
Returns to the standby state. If the response button 13 is pressed in step 26, the process proceeds to step 27, the output of the ringing sound from the speaker 6 is stopped, the response digital signal is transmitted, the carrier wave is modulated, and the signal is transmitted from the transmission section 4. Then, the process proceeds to step 28. Then, a tone signal of a specific frequency is transmitted, the carrier wave is modulated and transmitted from the transmitter 4. In step 29, the tone signal is t
It is judged whether it has been sent for 4 seconds. If it has not been sent for t4 seconds, the procedure returns to step 28 to send and send a tone signal, and if the sending has been done for t4 seconds, the tone signal is stopped at step 32, The countdown of the remaining call time limited by 33 is started, and the call state is entered in step 33.

As described above, according to the present embodiment, in the duplex wireless communication device having the forced call termination function, the control unit 11 controls the transmission and reception of the tone signal within a specific time period prior to the forced call termination operation. The presence or absence of the coincidence detection of the frequency of the tone signal is used to detect whether or not the call restart operation is possible, and the user who wants to continue the call does not operate any switch, but after a pause for a short time stipulated by law, The call can be automatically resumed immediately.

Further, the control section activates the tone amplifier and tone squelch section only during the line connection operation for starting a call, and the coincidence detection of the frequency of the tone signal is performed in addition to the coincidence detection of the digital signal. It is possible to prevent interference at the time, suppress an increase in current consumption, and prolong battery life.

According to the present invention, the tone amplifier and the tone squelch section of one tone IC in the above embodiment work separately, one set for the transmission frequency and the other set for the reception frequency. And two tone ICs
, And at least both ICs operate during a call, but the invention is not limited to this.
Each of the calling machine and the called machine operates the tone amplifier section on the transmitting side of one IC to send out the tone frequency, and the tone squelch section of the same IC operates on the receiving side to detect the tone frequency. It is possible to operate by one tone IC by setting and using so as to perform. However, at this time, the call end operation can be performed only from the caller side, but other effects are the same as those of the present invention, and the current consumption can be further reduced.

[0035]

As described above, the duplex wireless communication apparatus having the forced call termination function of the present invention includes a receiving section for receiving a carrier wave and a tone squelch section for detecting the frequency of a tone signal from the received output of the receiving section. A tone amplifier section for transmitting the frequency of the tone signal, a transmitting section for transmitting carrier waves of different frequencies paired with the received carrier wave, and a first specific time (t1) immediately before the end of the limited communication time. If there is no input from the talk switch in), a tone signal of a specific frequency is sent from the tone amplifier, the carrier is modulated and sent from the transmitter, and the tone squelch is received from the carrier received by the receiver. If the second specific time (t2) is detected within the first specific time (t1) immediately before the end of the limited communication time, the tone signal of the specific frequency is limited by the section. If the carrier sense operation specified by the law is performed and the carrier wave with the strength higher than the specified is not detected for the specified time after the forced termination of the call due to an error and the stop of the transmission for the time specified by the law, After sending the message from the transmitter, the transmitter again transmits the carrier wave with the same frequency as the one before the communication was stopped to start communication, and the tone squelch part is restricted from the carrier waves received from the other end of the call. The first specific time immediately before (t1)
If a tone signal having a specific frequency cannot be detected within a second specific time (t2), a control unit that stops transmission / reception and puts it in a standby state is provided.

Therefore, the call resuming operation is automatically performed in a short time depending on whether the tone signal is transmitted within the first specific time and the frequency of the received tone signal is detected as being coincident with the second specific time prior to the forced call termination. The user who wants to continue the call can resume the call without operating the switch, and can realize an easy-to-use continuous call similar to a general telephone.

Further, the control section activates the tone amplifier and the tone squelch section only during the line connection operation for starting a call, and performs the coincidence detection of the tone signal frequency in addition to the coincidence detection of the digital signal, A device that prevents interference during a call, suppresses an increase in current consumption during a call, prolongs battery life, reduces the frequency of battery replacement of the device of the present invention that is often carried and used outdoors, and adopts a small battery It is possible to realize the miniaturization of.

[Brief description of drawings]

FIG. 1 is a block diagram of a duplex wireless communication device having a forced call termination function according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation when the call is resumed.

FIG. 3 is a flowchart for explaining the operation at the time of line connection for starting the same call.

FIG. 4 is a flowchart illustrating an operation of a duplex wireless communication apparatus having a forced call termination function of a conventional example when a call is resumed.

FIG. 5 is a flowchart for explaining an operation at the time of line connection for starting the call.

[Explanation of symbols]

 3 Tone amplifier 4 Transmitter 8 Tone squelch 9 Receiver 10 End switch 11 Control

Claims (3)

[Claims] 1. A receiving unit that receives a carrier wave, a tone squelch unit that detects the frequency of a tone signal from the received output of the receiving unit, a tone amplifier unit that sends out the frequency of the tone signal, and a pair of the received carrier wave. And a first specific time (t) immediately before the end of the limited communication time.
If there is no input from the talk switch in 1), a tone signal of a specific frequency is sent from the tone amplifier unit, the carrier wave is modulated and transmitted from the transmitter unit, and the carrier wave received from the other party by the receiver unit. If the second specific time (t2) is detected within the first specific time (t1) immediately before the end of the limited communication time of the tone signal of the specific frequency in the tone squelch section, the time limit is exceeded. After forcibly ending the call and stopping the transmission for the time specified by the law, if the carrier sense operation specified by the law is performed and the carrier with the strength higher than the specified is not detected for the specified time, the call name is After transmitting from the transmission unit, the transmission unit again transmits a carrier wave of the same frequency as that before communication is stopped to start communication, and from the carrier waves received from the other party When the tone squelch part cannot detect the tone signal of the second specific time (t2) specific frequency within the first specific time (t1) immediately before the end of the limited call time, the transmission / reception is stopped and the standby state is set. A duplex wireless communication device having a compulsory call termination function including a control unit. 2. The control unit performs the coincidence detection of the tone signal frequency of the partner communication device together with the coincidence detection of the digital signal of the partner communication device only in the line connection operation for starting the communication. A duplex wireless communication apparatus having a forced call termination function according to claim 1. 3. The duplex wireless communication device with forced termination function according to claim 1, wherein the control unit operates to supply power to the tone amplifier unit and the tone squelch unit only when the tone amplifier unit and the tone squelch unit operate. .