JP2001160854A - Transmission adaptor for wireless communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication adaptor of a simple type at a low running cost that can realize wireless communication ordinarily in addition on the occurrence of a disaster. SOLUTION: The transmission adaptor that connects a general telephone set to a wired communication line and connects the general telephone set to a wireless telephone to allow the general telephone set to make wireless transmission, is provided with a signal transmission line that is used to supply a DC voltage to the general telephone set, to transmit a dial signal and a voice signal from the general telephone set and to transmit a voice signal from the wireless phone when a switching circuit is in a 1st state and used to shut the DC voltage having been so far supplied, to receive the DC voltage from the wired communication line and to supply it to the general telephone set when the switching circuit shifts from the 1st state to a 2nd state and with a voice signal section that receives the voice signal from the general telephone set through the signal transmission line, delivers the voice signal to the wireless telephone and receives the voice signal from the wireless telephone and delivers it to the signal transmission line when the switching circuit is in the 1st state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission adapter capable of establishing a wireless communication line at any time as required, and more particularly, to a transmission adapter which makes effective use of a general-purpose mobile phone.
The present invention relates to a simple type of transmission adapter capable of promptly informing of a damage situation at the time of a disaster.

[0002]

Not to mention the actual example of the 1995 Great Hanshin Earthquake,
It is important to notify the disaster situation from the disaster area to the outside without delay. However, in the event of a major disaster, the wired communication line between the affected area and the outside is often cut off. For this reason, for example, it is not possible to promptly communicate the damage situation of the branch office to the head office, or to receive information from local governments. Was not quickly transmitted to the center. In such a case, it is most desirable that wireless communication can be performed at any time from a key telephone set disposed at each desk of a company or government office, as needed. The present invention has been made based on this idea, and provides a transmission adapter for wireless communication that can reliably and quickly establish a wireless communication line even when a wired communication line is interrupted. The purpose is to do. It is also an object of the present invention to provide a simple type wireless communication transmission adapter that can be used from a general telephone such as a key telephone and can be used not only at the time of a disaster but also on a regular basis, and at a low running cost. And

[0003]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a method for connecting a general telephone to a wired communication line and connecting the general telephone to a wireless telephone.
A transmission adapter that also enables wireless transmission from the general telephone, and when the open / close circuit is in the first state,
When a DC voltage is supplied to a general telephone, a dial signal or an audio signal from the general telephone, and an audio signal from a wireless telephone are transmitted, while the switching circuit transitions from the first state to the second state. A signal transmission path for interrupting the DC voltage supplied up to that time, receiving the DC voltage from the wired communication line and supplying it to the general telephone, and a sound from the general telephone when the switching circuit is in the first state. An audio signal unit that receives a signal from the signal transmission path and transmits the signal to the wireless telephone, and receives an audio signal from the wireless telephone and transmits the signal to the signal transmission path. In the present invention, the general telephone is, for example, a key telephone provided at each desk of a company or a government office, and can realize wireless communication with a counterpart telephone using a wireless telephone as a repeater.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. [Reference Example] FIG. 1 shows the connection relationship between a portable telephone 2 and a key telephone 3 in a transmission adapter 1 according to a reference example of the present invention. Actually, the transmission adapter 1 includes a key telephone main unit and a PBX (private
branch exchange) through multiple button phones 3
. 3, but one key telephone 3 is directly connected to the transmission adapter 1 for convenience of explanation. This transmission adapter 1 is a key telephone 3
When a specific button is pressed, the key telephone 3 and the mobile telephone 2 are directly connected to establish a public communication line by a wireless line. As shown in the figure, the transmission adapter 1 includes a circuit connection unit 4 that connects the transmission adapter 1 and the key telephone 3, and an audio signal unit 5 that transmits and receives an audio signal between the mobile phone 2 and the circuit connection unit 4. ,
A control section 6 for controlling the operation of each section of the apparatus is mainly provided.

The circuit connection section 4 supplies a DC voltage to the key telephone 3 and a signal transmission line 7 for transmitting an AC signal.
A forcible shutoff unit 8 for forcibly interrupting the conduction of the signal transmission path 7 and a detecting unit 9 for detecting a dial pulse (DP) or the like transmitted from the key telephone 3 via a photocoupler.
And the push button (P
The B) signal is composed of a tone receiver 10 for receiving through the transformer T _2. The photocoupler is, specifically, a light emitting diode D and a phototransistor Tr.
It is composed of The detecting unit 9 has a line monitoring function of detecting the presence of a call current by turning on the light emitting diode D, and a DP pulse counter function of detecting a dial pulse (DP) from the blinking state of the light emitting diode D. . Signal transmission path 7 described above is connected to a DC power supply unit 11 via the transformer T _1, key telephone 3
When a primary side of the transformer T _2, a light emitting diode D, is a closed circuit with forced blocking portion 8 is formed. In addition, the forcible cutoff section 8 is specifically composed of a relay coil 8a and a relay contact 8b. In this example, the relay contact 8b is opened by energizing the relay coil 8a, and the conduction of the signal transmission path 7 is cut off. It is supposed to be.

The audio signal section 5 amplifies an audio signal from the portable telephone 2 and transmits the amplified signal to the transformer T _1.
When, and a second amplifier 13 for transmitting to the mobile phone 2 by amplifying the audio signal from the transformer T _1. In addition,
For simplicity, the extraction terminal 5a of the audio signal unit 5 may be connected to the earphone terminal 2a of the mobile phone 2. First and second
Amplifiers 12 and 13 have their input level signals S ₁ and S ₂
Is supplied to the control unit 6, while the control signal C
Have received a T _1, CT _2. Here, the input level signal S
₁ and S ₂ are signals obtained by averaging the AC input signals to the amplifiers 12 and 13, and are used by the control unit 6 to monitor whether or not the input levels to the amplifiers 12 and 13 have exceeded a threshold value. Signal. The control signals CT ₁ and CT ₂ are:
An ON / OFF signal for determining whether or not the amplifiers 12 and 13 function as amplifiers.
When an ON signal is received from the control unit 6, a predetermined amplification operation is performed, but when an OFF signal is received, no signal is output. The control unit 6 includes a CPU, ROM, RA
A computer circuit including a microcomputer including M and an interface unit including an AD converter and a DA converter, and realizes the following control operation according to a control program stored in a ROM. Hereinafter, the operation of the transmission adapter 1 will be described.

(1) Standby state In the standby state, the hook switch HS of the key telephone 3
Is in an open (ON hook) state, and the DC voltage of the DC power supply unit 11 is supplied to the key telephone 3 via the signal transmission path 7. However, since the hook switch HS is open, no call current flows, and the light emitting diode D is off. In this standby state, the mobile phone 2 is in a standby state with the power on, and the control unit 6
Recognizes the off state of the light emitting diode D based on a signal from the detection unit 9 which is performing the line monitoring function.

(2) Transmission preparation state If it is desired to establish a wireless communication line for some reason, the handset of the key telephone 3 should be picked up and a specific button set for wireless communication should be pressed. Then, the hook switch HS enters a closed (OFF hook) state, so that the DC communication current from the power supply unit 11 is supplied to the signal transmission path 7.
And the light emitting diode D is turned on. Then, the control unit 6 recognizes the presence of the call current based on the signal from the detection unit 9 which is performing the line monitoring function, and then controls the control signal line C.
A transmission signal is transmitted to the mobile phone 2 via the TR. The mobile phone 2 that has received the transmission signal outputs a dial tone (DT) signal to the audio signal unit 5 after checking the radio wave condition. This operation is an operation generally realized in a commercially available mobile phone (for example, cellular HD-30K).

[0009] the audio signal portion 5 is dial tone (DT) signal is supplied, the control unit 6, by the level value of the input level signals S ₁ exceeds the threshold value, it is possible to recognize it. Therefore, the control unit 6 sends the ON level control signal CT ₁ to cause the first amplifier 12 to perform the amplification operation, and sends the OFF level control signal CT ₂ to set the second amplifier 13 to the non-operation state. I do. 1st amplifier 1
The dial tone (DT) signal amplified in 2 is transmitted to the signal transmission line 7 via the transformer T _1, and the dial telephone (DT) signal “two” is generated from the key telephone 3.

(3) Dialing operation When the telephone number of the other party is input to the key telephone 3, the push button (Push button () is transmitted to the signal transmission path 7 depending on whether the telephone is of the push button type or the dial pulse type. A PB) signal or a dial pulse (DP) signal is output. The push button (P
B) The signal discriminates the numbers 0 to 9 according to the frequency of the transmitted signal, and the dial pulse (DP) signal discriminates the numbers 0 to 9 according to the number of transmitted pulses. Signal Puyushubotan (PB) signals sent to the transmission line 7 is transmitted to the tone receiver 10 through the transformer T _2, whereas, dial pulse (DP) signal via the photocoupler functions as a DP pulse counter detects It is transmitted to the part 9. However, in any case, the control unit 6 controls the tone receiver 10 or the detection unit 9
Can recognize the telephone number of the other party to be called.

After recognizing the telephone number of the other party to be called, the control unit 6 performs necessary signal conversion processing, and then executes the control signal line C
A dial signal (uplink serial signal) is transmitted to the mobile phone 2 via the TR. Then, the mobile phone 2
Transmits a dial signal from the antenna 2b. Also,
The mobile phone 2 outputs a ringback tone to the audio signal unit 5 in accordance with the calling process. Note that these operations are also operations generally realized by a commercially available mobile phone. In this state, since the first amplifier 12 realizes a predetermined amplification operation, the ringback tone is transmitted to the signal transmission path 7 via the transformer T ₁ and also transmitted to the key telephone 3.

(4) Talking Operation After that, when the other party to be called picks up the telephone, the other party's telephone and the key telephone 3 are connected via the portable telephone 2, the voice signal unit 5, and the signal transmission path 7. become. As is apparent, the transmission from the key telephone 3 is transmitted from the signal transmission line 7 to the audio signal unit 5 via the transformer T ₁ , amplified by the second amplifier 13 and transmitted to the mobile telephone 2. Then, the mobile phone 2 transmits the transmission signal to the other party's telephone via the wireless communication line. During a call operation, if the call between the other party's telephone and the mobile phone 2 is disconnected due to a poor radio wave condition or the like, the mobile phone 2 notifies this via the control signal line CTR. 6 forcibly cuts off the signal transmission path 7 by operating the relay coil 8a. When the signal transmission path 7 is cut off, the key telephone 3 enters a silent state, so that when the handset is returned, the hook switch HS returns to the initial state.

(5) When the call is completed When the handset of the key telephone 3 is returned after the call operation is completed normally, the hook switch HS is opened (ON hook).
As a result, the signal transmission path 7 is opened. Then, the talk current in the signal transmission line 7 is cut off, and the light emitting diode D is turned off. Therefore, the control unit 6 can recognize the fact via the detection unit 9 which is performing the line monitoring function. Then, the control unit 6 sends an end signal to the mobile phone 2 via the control signal line CTR,
Cuts off the wireless communication line with the other party. As mentioned above,
If the transmission adapter 1 shown in FIG. 1 is used, a wireless communication line can be constructed only by pressing a specific button of the key telephone 3, so that it is possible to appropriately cope with a disaster or the like. In addition, when calling a mobile phone, the line usage fee is lower than when calling from a general telephone. Therefore, if the calling adapter 1 of the present invention is used on a daily basis, the communication cost of the company is constantly reduced. You can also save money.

FIG. 2 shows an embodiment of the present invention. The construction of a wired communication line and the construction of a wireless communication line can be arbitrarily selected only by the telephone number from the key telephone 3. The transmission adapter 1A thus constructed is shown. The feature of this embodiment is that the signal transmission line 7 is provided with circuit switching units R ₁ and R ₂ , and the construction of the wired communication line and the wireless communication line is arbitrarily switched. points to connect it to the transformer T _1,
That provided the delivery relay R ₃ for delivering a dial pulse signal to the NTT wire line, a point in which a transformer T ₃ for delivering a push-button signal to the NTT wired line, the control unit 6A, It has a dial number storage function. In response to this feature, the control unit 6A includes control signals CT ₅ and CT ₆ for controlling the circuit switching units R ₁ and R ₂ , a control signal CT ₃ for controlling the operation of the pseudo tone generating unit 14, and a control signal CT ₄ for controlling the delivery relay R _3, and outputs appropriately. The other control signal CT ₁ to CT ₃ functions as in the reference example.

The operation of the transmitting adapter shown in FIG. 2 will be described below. (1) Standby state In the standby state, the circuit switching units R ₁ and R ₂ are in the state shown in the figure, so that the key telephone 3 and the NTT line are
It is open at the position of the circuit switching unit R _1. on the other hand,
DC voltage of the DC power supply unit 11, through the transformer T ₂ → the light emitting diode D → signal transmission line 7 composed of a path of the relay contact 8b → circuit switching unit R _2, is supplied to the key telephone 3. However, since the hook switch HS of the key telephone 3 is open, no call current flows, and the light emitting diode D is off.

(2) Preparation for Calling After that, when the handset of the key telephone 3 is lifted, the hook switch HS is closed (OFF hook).
The DC communication current from the power supply unit 11 flows through the signal transmission line 7 to light the light emitting diode D. Then, the control unit 6A
Recognizes the presence of a call current based on a signal from the detection unit 9. Next, the control unit 6A varies the control signal CT ₃ to start the operation of the pseudo tone generator 14. The dial tone signal from the pseudo tone generator 14 is
_Since the signal is transmitted to the signal transmission path 7 via the key ₁ , the dial telephone signal "two" is generated from the key telephone 3.

(3) Dial operation On the side of the key telephone 3, whether a wired communication line is used or not.
What is necessary is just to arbitrarily select whether to use a wireless communication line and input a necessary telephone number. When a wireless communication line is to be used, a special number (for example, 00
(Special numerical value such as 0). The telephone number from the key telephone 3 is input to the tone receiver 10 or the detection unit 9 according to the push button (PB) signal or the dial pulse (DP) signal. Therefore, the control unit 6A
Stores this telephone number in its internal memory and analyzes the telephone number. Specifically, it is determined whether or not the first three digits are special numerical values.

[When a special numerical value is added] As a result of analyzing the telephone number, if the first three digits are a special numerical value, the control unit 6A performs necessary signal conversion processing and then executes a control signal line. A dial signal (uplink serial signal) without the special numerical value is transmitted to the mobile phone 2 via the CTR. The subsequent operation is the same as that described in the reference example, and the key telephone 3 realizes wireless communication with the other telephone via the mobile telephone 2. [If no special numerical value is added] As a result of analyzing the telephone number, if the first three digits are not a special numerical value, the control unit 6A first changes the control signals CT ₅ and CT ₆ ,
The operation state of the circuit switching units R ₁ and R ₂ is reversed from the state shown in the figure. By this operation, the DC power supply unit 11 is disconnected from the signal transmission line 7, but the signal transmission line 7
Since a DC voltage is supplied from the wired line, no problem occurs. Subsequently, the control unit 6A, either output Puyushubotan (PB) signal through the transformer T _3, or by opening and closing the delivery relay R ₃ outputs a dial pulse (DP) signal by the control signal CT _4. The signal output to the NTT line corresponds to the telephone number of the other party stored in the control unit 6A, and thereafter, ordinary public communication using the NTT wired communication line is realized.

In the above, the use mode of the transmission adapter 1A has been described in which the general telephone and the mobile telephone can be called using the NTT wired communication line and the general telephone and the mobile telephone can be called via the mobile telephone 2. However, if it is desired to use the transmission adapter 1A regularly and use it effectively, use the NTT wired communication line when transmitting to a general telephone, and use the mobile telephone 2 when transmitting to a mobile telephone. It is preferable to use a wireless communication line via the Internet. When the usage mode is limited in this way, it is not necessary to add the above-mentioned special numerical value, so that the user can input a normal telephone number without being aware of anything. That is, a wireless communication line is established only when a telephone number for a mobile phone starting from 030, 040, 080, 090 is input. In this case, the control unit 6A only needs to determine the presence or absence of 030, 040, 080, and 090 instead of determining the special numerical value.

Thus, in the case of the illustrated embodiment,
Just enter your phone number and you'll get a regular
It is possible to select wireless communication via a mobile phone. When communicating with the mobile phone, the communication cost is lower when the call is transmitted from the mobile phone, so that the communication cost can be reduced by using this system regularly. Since a commercially available wireless telephone is effectively used, the present system can be completed with a minimum investment.

[0021]

As described above, according to the present invention,
Wireless communication can be performed from a general telephone at any time as needed. Therefore, even if the wired communication line is cut off, the disaster situation and the like can be appropriately and appropriately transmitted to the outside from the key telephones arranged at each desk of the company or government office. Since the wireless communication line can be used not only at the time of disaster but also on a regular basis, communication costs for companies can be saved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a reference example of the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission adapter 2 Wireless telephone (mobile telephone) 3 General telephone (button telephone) 5 Audio signal part 6, 6A control part 7 Signal transmission line 9 Line monitoring part, dial recognition part (detection part) 10 Dial recognition part (tone receiver)

Claims (1)

[Claims] 1. A general telephone is connected to a wired communication line, and the general telephone is connected to a wireless telephone.
A transmission adapter that also enables wireless transmission from the general telephone, wherein when the open / close circuit is in the first state, while supplying a DC voltage to the general telephone, a dial signal or a voice signal from the general telephone, And transmitting an audio signal from a wireless telephone, and when the switching circuit transitions from the first state to the second state, cuts off the DC voltage that has been supplied up to that point, and transmits the DC voltage from the wired communication line. And a signal transmission path for receiving and transmitting the voice signal from the general telephone to the wireless telephone when the switching circuit is in the first state. An audio signal unit for receiving an audio signal and transmitting the audio signal to the signal transmission path.