JP2001036659A - Telephone set connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a means that transmits dial information of a telephone set to a personal computer with a telephone set connector. SOLUTION: The telephone set connector has a ringer detection circuit 117, a hook detection circuit, a 2/4-wire conversion circuit 112, and a DTMF detection circuit 111 to connect a telephone set and an information processing unit to a telephone line. When the ringer detection circuit 117 does not detect a ringer tone for a prescribed time and the hook detection circuit detects off-hook of the telephone set, the information processing unit is controlled to transfer information to the telephone line via the 2/4-wire conversion circuit 112, and the DTMF detection circuit 111 detects a numeral/symbol entered from the telephone set and informs the information processing unit of the numeral/symbol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone connection device, and more particularly to a DTMF detection circuit for detecting a numeric key of 0 to 9 and a symbol key of * and # pressed at the time of calling by a telephone connected to a voice modem. Then, the information processing apparatus is notified of the destination telephone number.

[0002]

2. Description of the Related Art Conventionally, a telephone number input by a user at the time of calling is stored in a memory provided in a telephone (multifunctional telephone) itself or in a memory provided in an exchange, and the telephone number is used. There is a technology to say that. As is well known, when connecting to the same party again, it is possible to connect efficiently by calling the registered short number without dialing all digits of the telephone number. It is.

On the other hand, with the spread of personal computers in recent years, as represented by the Internet, communication and use of personal computers have come to have a close relationship. It is used as a line connection means, and its role is generally terminated by dialing a telephone office. However, recently, the integrated use of a telephone and a personal computer has become remarkable, and various systems have been proposed.

For example, there has been proposed a system in which a telephone connected to a telephone connection device is switched to a telephone line and other devices, and a DTMF signal is notified to an information processing device (publication number JP-A-1-41357). This system is
Although the telephone is disconnected from the telephone line and can be used locally, when disconnecting the telephone from the telephone line, the telephone connection device judges the state of the telephone line and the telephone and automatically connects the telephone line and the telephone. It does not cut off.

On the other hand, there has been proposed a system for detecting a DTMF signal from a telephone connected to a telephone connection device and notifying the information processing device (Japanese Patent Application No. Hei 8 (1996) -108).
-346031). In this system, the telephone connection device detects an on / off hook signal and a DTMF signal, and notifies the detected signal to the information processing device as a destination telephone number for the on / off hook and DTMF signal. However, when notifying the destination telephone number, this method does not determine whether the call is off-hook due to an incoming call or off-hook for making a call, so the DTMF signal is definitely used as the destination telephone number. It is not possible to notify the information processing device.

[0006]

As described above, in a conventional telephone connection device, only a telephone is connected to a telephone line when a call is made from the telephone unless there is a command from the information processing device. Therefore, when the telephone is off-hook to make a call when there is no command from the information processing device, the input is performed.
The numeral key 9 and the symbol keys * and # could not be detected by the DTMF detection circuit of the telephone connection device.

[0007] The present invention relates to a telephone connection method when a telephone connected to a telephone connection device goes off-hook, or when an off-hook of the telephone is detected and no ringer sound is detected by a ringer detection circuit until the telephone is off-hook. When the device determines that the call is from the telephone, the DTMF detection circuit of the telephone connection device detects the numeric key and the symbol key pressed at the time of calling by the telephone, notifies the information processing device, and makes the call. First, information in the information processing apparatus can be transmitted.

[0008]

Means for Solving the Problems In order to solve the above problems, the following means are taken. (1) Ringer detection circuit, hook detection circuit, 2 wire / 4
In a telephone connection device having a line conversion circuit and a DTMF detection circuit for connecting a telephone and an information processing device to a telephone line, the ringer detection circuit does not detect a ringer sound for a predetermined time, and the hook detection circuit Detects that the telephone is off-hook, the information processing device is controlled to be able to transfer information to the telephone line via the 2-wire / 4-wire conversion circuit, and the DTMF detection circuit is input from the telephone. It is configured to detect a numerical value / symbol and notify the information processing device of the numerical value / symbol.

With this configuration, when the operator goes off-hook in a situation where no call is received from another person, the telephone is connected to the telephone line interface and becomes operable. If the telephone is dialed, the telephone is dialed through the telephone line. The information processing apparatus (such as a personal computer) is notified of the contents of the dial while connecting to the called party and enabling transmission of information in the information processing apparatus. (2) a ringer detection circuit, a hook detection circuit, a first connection switching means, a second connection switching means, a DTMF detection circuit, a power supply circuit, and a tone generation circuit; In a telephone connection device for connecting a device to a telephone line, when the ringer detection circuit does not detect a ringer sound for a certain period of time and the hook detection circuit detects an off-hook of the telephone, the telephone sets the first telephone. Disconnecting from the telephone line by the switching means,
Connected to the switching circuit by the second switching means, the tone generation circuit sends a dial tone to the telephone, the DTMF detection circuit detects a numerical value / symbol input from the telephone, and To be notified of the numerical value / symbol.

With this configuration, when the operator goes off-hook in a situation where no call is received from another person, the telephone is disconnected from the telephone line interface, and is instead connected to the power supply circuit to be in an operable state. When dialing with a telephone, the contents of the dialing are notified to a personal computer or the like, but the dialing destination is not connected.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to a circuit configuration diagram (FIG. 1) and a flowchart 1 (FIG. 6). A CPU 101 controls the operation of the present apparatus.
A memory for storing or executing the program 101 is a bus 105 for exchanging data with the CPU 101. The PC interface 104 is an interface for connecting the bus 105 and the information processing device. A / D conversion circuit 106, D / A conversion circuit 1
07 performs digital / analog conversion, and 2 lines / 4
The line conversion circuit 112 connects the public line to the A / D and D / A conversion circuits. Hook detection circuit 110
Monitors the current flowing through the telephone interface 116 and determines that the telephone connected to the telephone interface 116 is off-hook or on-hook when the current is turned on from off or from on to off, and The CPU 101 is notified by a specific signal line. The DTMF detection circuit 111 detects a DTMF tone from a telephone connected to the telephone interface 116 or from a telephone line. The connection switching means (hereinafter, relay) 113 is controlled by the CPU 101 through the relay control circuit 108. The relay 114 is controlled by the CPU 101 through the relay control circuit 109.

When the relay 114 is on (active), the telephone connected to the telephone interface 116 is directly connected to a telephone line (or telephone network).
The telephone line interface 115 is an interface for connecting the present invention to a public line or the like. The telephone interface 116 is an interface for connecting the present apparatus to a telephone. The ringer detection circuit 117 monitors the telephone line interface 115, and goes through the bus 105 every time a ringer signal from the line is detected (for example, when it is an NTT public line, it is on at 16 Hz for 1 second and off for 2 seconds). Then, the CPU 101 is notified. CPU1 that was notified
01 sets the state management variable (RING-FLAG) (RI
NG-FLAG = 1).

Note that the RING-FLAG receives the on-hook notification from the hook detection circuit when the device is started to be used, and further, the linger detection notification is sent to the CPU 10 for a certain period of time.
It is reset when it does not come to 1 (RING-FLAG = 0).

Next, the user operates the telephone interface 11.
When a call is made from the telephone connected to 6, the telephone receiver is first off-hook. When going off-hook,
Hook detection circuit 110 determines that the telephone has been hooked off and notifies CPU 101 that the hook has been hooked off. The CPU 101 that has received the notification refers to the RING-FLAG, turns on the relay 113 (active) via the relay control circuit 108 only when the RING-FLAG is 0 (reset), and sets the line and the 2-wire / 4-wire. Connect the conversion circuit 112,
At the same time, set HOOK-FLAG to 1 (set). Thereafter, when a DTMF signal is transmitted from the telephone, the DTMF signal is transmitted to the telephone line via the telephone line interface 115, and at the same time, the DTMF detection circuit 111 detects the DTMF signal and notifies the CPU 101 of the DTMF detection. I do. The CPU 101 that has received the notification executes the PC interface 1
Inform the information processing apparatus as an event via the information processing device 04.

The line and the 2-wire / 4-wire conversion circuit 112 are disconnected when the telephone receiver is hooked on. According to the configuration shown in FIG. 1, when the operator goes off-hook in a situation where no call is received from another person, the telephone is connected to the telephone line interface and becomes operable. The connection is made first, and the contents of the dial are notified to an information processing device (such as a personal computer).

Therefore, when it is desired to reconnect to the other party of the telephone call, a simple operation is performed using the dial contents used for the current connection (for example, a specific number or symbol is associated with the current dial contents). It goes without saying that you can connect to the other party (if you specify the numbers and symbols), but by associating the contents of this dial with the data stored in the personal computer, Voice communication and data communication with high reliability can be performed.

FIG. 2 is a circuit diagram showing a second embodiment of the present invention.
This will be described with reference to FIG. 2 and flowchart 2 (FIG. 7). In this case, the relay 113 is always turned off. The relay 307 is transmitted through the relay control circuit 301 to the CP.
It is controlled by U101. When this relay is on (active), the telephone connected to the telephone interface 116 is connected to the two-wire / four-wire conversion circuit 306 and the power supply circuit 3.
04. The power supply circuit 304 generates a power supply necessary to drive the telephone,
Tone generation circuit 30 for supplying the telephone connected to 16
5 is controlled by the CPU 101 to generate a ringback tone / dial tone / DTMF tone signal and the like,
Telephone interface 116 via A conversion circuit 303
, Or via the D / A conversion circuit 107 and transmitted from the telephone line interface 115 to the telephone line.

When a user places a call from a telephone connected to the telephone interface 116, the user first goes off-hook on the telephone receiver. When off-hook, the hook detection circuit 110 determines that the telephone is off-hook,
The CPU 101 is notified of the off-hook. Upon receiving the notification, the CPU 101 sets HOOK-FLAG to 1 (set), turns off the relay 114 (inactive) via the relay control circuit 109, and simultaneously turns on (active) the relay 307 via the relay control circuit 301. Then, the telephone connected to the telephone interface 116 is disconnected from the telephone line. Power required for driving the telephone is supplied from the power supply circuit 304. CPU with relay control
101 controls the tone generation circuit, generates a dial tone signal, and converts the generated dial tone signal into a D / A signal.
The data is transmitted to a telephone connected to the telephone interface 116 via the conversion circuit 303. Thereafter, when the DTMF signal is transmitted from the telephone, the DTMF detection circuit 111
Detects the DTMF signal, and the DTMF detection circuit 111 notifies the CPU 101 of the DTMF detection. The CPU 101 that has received the notification notifies the information processing apparatus as an event via the PC interface 104.

According to the configuration shown in FIG. 2, when the operator goes off-hook, the telephone is disconnected from the telephone line interface, and is instead connected to the power supply circuit and becomes operable. The contents are notified to a personal computer or the like, but are not connected to the dialed party.

Therefore, if the user does not want to make a call at this time but wants to make a call later, he or she must first notify the personal computer of the dial contents such as the telephone number of the other party, and notify the computer first when calling the other party later. Needless to say, it is possible to connect to the other party by simple operation using the dialed content, but by further associating the dialed content with the data stored in the personal computer, it is possible to make a reliable connection without mistake. Voice communication and data communication with high reliability can be performed.

FIG. 3 is a circuit diagram showing a third embodiment of the present invention.
This will be described with reference to FIG. 3 and flowchart 3 (FIG. 8). When a user places a call from a telephone connected to the telephone interface 116, the user first goes off-hook on the telephone handset. When the user goes off-hook, the hook detection circuit 110 determines that the telephone is off-hook, and notifies the CPU 101 of the off-hook.
Upon receiving the notification, the CPU 101 refers to the RING-FLAG and
Only when the flag is 0 (reset), HOOK-FLAG is set to 1 (set), and the relay 114 is set via the relay control circuit 109.
Is turned off (inactive), and at the same time, the relay control circuit 3
By turning on (active) the relay 307 via 01, the telephone connected to the telephone interface 116 is disconnected from the telephone line. Power required for driving the telephone is supplied from the power supply circuit 304. CPU 101 that has performed the relay control next controls the tone generation circuit,
A dial tone signal is generated, and the generated dial tone signal is transmitted to a telephone connected to the telephone interface 116 via the D / A conversion circuit 303. Thereafter, when a DTMF signal is transmitted from the telephone, the DTMF signal is transmitted.
The detection circuit 111 detects the DTMF signal, and the DTMF detection circuit 111 notifies the CPU 101 of the DTMF detection. The CPU 101 that has received the notification notifies the information processing apparatus as an event via the PC interface 104.

According to the configuration of FIG. 3, when the operator goes off-hook in a situation where no call is received from another person,
The telephone is disconnected from the telephone line interface, and is instead connected to the power supply circuit and becomes operable.If the telephone is dialed, the contents of the dial are notified to a personal computer or the like. Not connected.

In the case of this configuration, the number of ringer detection circuits is increased as compared with FIG. 3, but the provision of the ringer detection circuit does not cause a problem that the connection is erroneously cut off when a call is received from the other party. , It is possible to reduce the mental tension of the operator. Other effects are the same as those in FIG.

FIG. 3 is a circuit diagram showing a fourth embodiment of the present invention.
The operation will be described with reference to FIG. 3 and a flowchart 4 (FIG. 9). When a user places a call from a telephone connected to the telephone interface 116, the user first goes off-hook on the telephone handset. When off-hook, the hook detection circuit 110 determines that the telephone has been off-hook, and notifies the CPU 101 of the off-hook.
Upon receiving the notification, the CPU 101 refers to the RING-FLAG and
HOOK-FLAG is set to 1 only when the flag is 0 (reset)
(Set) and relay 1 via relay control circuit 108
13 is turned on (active), the line is connected to the 2-wire / 4-wire conversion circuit 112, and the relay 114 is turned off (inactive) via the relay control circuit 109, and at the same time, the relay 307 is sent via the relay control circuit 301. By turning on (active) the telephone interface 116
Disconnect the telephone that leads to from the telephone line. Power required for driving the telephone is supplied from the power supply circuit 304. The CPU 101 that has performed the relay control next controls the tone generation circuit, generates a dial tone signal, and sends the generated dial tone signal to the telephone connected to the telephone interface 116 via the D / A conversion circuit 303. Thereafter, when the DTMF signal is transmitted from the telephone, the DTMF detection circuit 111 detects the DTMF signal, and the DTMF detection circuit 111 notifies the CPU 101 of the DTMF detection. Upon receiving the notification, the CPU 101 controls the tone generation circuit to stop sending the dial tone signal, and notifies the information processing apparatus as an event via the PC interface 104, and at the same time, from the telephone line interface 115 through the D / A conversion circuit 107. Send to telephone line.

In this case, when the operator goes off-hook, the telephone is disconnected from the telephone line interface and cannot be connected to the telephone line, but is instead connected to the power supply circuit to be in an operable state. In other words, if the user dials with a telephone, the contents of the dial are notified to a personal computer or the like. Next, the connection to the telephone line becomes possible by detecting the dial operation by the DTMF detection circuit.

Therefore, this time, only the notification (registration) of data (dial contents, etc.) is to be performed without connection, but this is effective when it is necessary to quickly connect to the other party due to circumstances. Other effects are the same as those of the above-described invention.

FIG. 3 is a circuit diagram showing a fifth embodiment of the present invention.
This will be described with reference to FIG. 3 and a flowchart 5 (FIG. 10). When a user places a call from a telephone connected to the telephone interface 116, the user first goes off-hook on the telephone handset. When off-hook, the hook detection circuit 110 determines that the telephone is off-hook,
The off-hook is notified to the PU 101. The CPU 101 having received the notification refers to the RING-FLAG and sets the HOOK-FLAG to 1 (set) only when the flag is 0 (reset).
Then, the relay 113 is turned on (active) via the relay control circuit 108, and the line and the 2-wire / 4-wire conversion circuit 112
, And the relay 114 is turned off (inactive) via the relay control circuit 109, and the relay 307 is turned on (active) at the same time via the relay control circuit 301.
By doing so, the telephone connected to the telephone interface 116 is disconnected from the telephone line. The power required to drive the telephone is supplied from the power supply circuit 304. The CPU 101 that has performed the relay control next controls the tone generation circuit, generates a dial tone signal, and sends the generated dial tone signal to the telephone connected to the telephone interface 116 via the D / A conversion circuit 303. Then, when the DTMF signal is sent from the telephone,
The DTMF detection circuit 111 detects the DTMF signal,
The MF detection circuit 111 sends DTMF to the CPU 101.
Notify detection. Upon receiving the notification, the CPU 101 controls the tone generation circuit to stop the dial tone signal transmission, and further notifies the information processing device as an event via the PC interface 104, and at the same time, the tone generation circuit 30
Inform 5 Upon receiving the notification, the tone generation circuit 305
An F signal is generated, and the generated DTMF signal is transmitted from the telephone line interface 115 to the telephone line via the D / A conversion circuit 107.

In this case, as in the fourth embodiment of the present invention, when the operator goes off-hook, the telephone is disconnected from the telephone line interface and cannot be connected to the telephone line. However, instead, it is connected to the power supply circuit and becomes operable. If the user dials with a telephone, the contents of the dial are notified to a personal computer or the like.
Next, the connection to the telephone line becomes possible by detecting the dial operation by the DTMF detection circuit.

FIG. 4 is a circuit diagram showing a sixth embodiment of the present invention.
This will be described with reference to FIG. 4 and a flowchart 6 (FIG. 11). The polarity reversal detection circuit 701 monitors the telephone line interface 115, detects that the polarity of the line is reversed when the receiving side is off-hook (other party off-hook) from the receiving side calling (during the other party calling), and passes through the bus 105. Then, the CPU 101 is notified. The tone detection circuit 702 detects a ringback tone from the line and notifies the CPU 101 via the bus 105 of the detection. Upon receiving the ringback tone detection notification, the CPU 101 sets the state management variable (TONE-FLAG) (TONE-FLAG = 1), generates a ringback tone signal by controlling the tone generation circuit, and generates the generated ringback tone signal. To the telephone connected to the telephone interface 116 via the D / A conversion circuit 303. Note that TONE-FLAG is used when this device is started to use, when an on-hook notification is received from the hook detection circuit,
It is reset when a ringback tone detection notification has not arrived at the CPU 101 for a predetermined time (TONE-FLAG = 0).

Hereinafter, there are two cases. The first case is a case where polarity inversion detection is used. In this case, the polarity inversion detecting circuit 701 detects that the polarity of the line has been inverted.
Notifies the CPU 101 that the CPU 10
1 judges that the other party has responded, and sets the relay control circuit 10
9, the relay 114 is turned on (active) and the relay 307 is turned off (inactive) via the relay control circuit 301, whereby the telephone connected to the telephone interface 116 is disconnected from the power supply circuit 304 and directly connected to the telephone line. Connect. The line is disconnected from the 2-wire / 4-wire conversion circuit 112 when the telephone receiver is hooked on-hook.

The second case is a case where tone detection is used. In this case, if HOOK-FLAG is set (1) when the ringback tone detection notification has not arrived at the CPU 101 for a certain period of time, the CPU 101 determines that the other party has responded, and activates the relay 114 via the relay control circuit 109. Turn on (active), and furthermore, the relay control circuit 301
By turning off (inactive) the relay 307 via the terminal, the telephone connected to the telephone interface 116 is disconnected from the power supply circuit 304 and directly connected to the telephone line. The line is disconnected from the 2-wire / 4-wire conversion circuit 112 when the telephone receiver is hooked on-hook.

With this configuration, as in the fourth embodiment of the present invention and the fifth embodiment of the present invention, when the operator goes off-hook, the telephone is disconnected from the telephone line interface, and the telephone is disconnected. The connection to the line becomes impossible, but instead it is connected to the power supply circuit and becomes operable. If the user dials with a telephone, the contents of the dial are notified to a personal computer or the like. Next, the connection to the telephone line becomes possible by detecting the dial operation by the DTMF detection circuit. Further, when the other party picks up the telephone, the telephone is restored to the connection with the telephone line interface,
Calls can be made in a normal connection state.

FIG. 5 shows an example of a system configuration suitable for applying each of the above embodiments. In the figure, reference numeral 1 denotes a telephone connection device, which includes a PC interface, a telephone line interface, and a telephone interface shown in FIGS. 1 to 4, but a configuration in which some or all of these interfaces are separately provided outside is naturally possible. is there. Reference numeral 2 denotes a personal computer (personal computer). Reference numeral 3 denotes a telephone having a dial function, but may have a form capable of inputting characters such as alphabets in addition to a numeric dial. Reference numeral 4 denotes a general line network such as a telephone line.

Although the various functions described in each of the above-described configurations can be obtained by the configuration of FIG. 5, various types of functions can be obtained as described below by associating dial contents notified to the personal computer with data stored in the personal computer. Application is possible. (1) By associating the dial contents with the time of data transmission in a schedule such as a business logbook, it is possible to avoid losing contact. (2) In addition to character data, dial data, voice data,
If it is associated with image data, it can be used for automatic transmission of such data. (3) By associating the dial contents with the data when storing the data, the user does not need to input the telephone number again when sending the data, and furthermore, mistakes the data transmission destination (connection destination). The danger of transmission can be avoided.

[0035]

As is apparent from the above description, according to the present invention, when the off-hook is detected by the hook detection circuit, or when the off-hook of the telephone is detected, and the ringer is detected by the linger detection circuit until the off-hook is detected. When no sound is detected, the DTMF detecting means detects the numeric key and the symbol key pressed at the time of calling by the telephone by determining that the telephone connection is originating from the telephone by the telephone connection device. It is possible to notify the information processing device.

Also, since a telephone can be used, without installing a special multifunctional telephone or a special exchange,
It is possible to notify the PC of the calling number,
By notifying the phone number to the personal computer, it is easy to expand the service of the application on the personal computer.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram 1

FIG. 2 is a circuit configuration diagram 2

FIG. 3 is a circuit configuration diagram 3

FIG. 4 is a circuit configuration diagram 4

FIG. 5 is a system configuration diagram

FIG. 6 is a flowchart 1

FIG. 7 is a flowchart 2

FIG. 8 is a flowchart 3

FIG. 9 is a flowchart 4;

FIG. 10 is a flowchart 5

FIG. 11 is a flowchart 6;

[Explanation of symbols]

 1 is a telephone connection device, 2 is a personal computer, 3 is a telephone, 4 is a telephone line, 101 is a CPU, 102 is a ROM, 103 is a RAM, 104 is a PC interface, 105 is a bus, 106 and 302 are A / D conversion circuits, and 107 and 303 are D / A conversion circuits, 108,109,301 are relay control circuits, 110 is a hook detection circuit, 111 is a DTMF detection circuit, 112,306 is a 2-wire / 4-wire conversion circuit, 113,114,307 are relays (connection switching means), 115 is a telephone line interface, 116 Is a telephone interface, 117 and 201 are ringer detection circuits, 304 is a power supply circuit, 305 is a tone generation circuit, 701 is a polarity reversal detection circuit, and 702 is a tone detection circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tomoyoshi Takebayashi 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Yasuo Sato 4-chome, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa 1-1 No. 1 Fujitsu Limited (72) Inventor Tomoharu Matsushita 4-1-1 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture 1-1 No. 1 Fujitsu Limited (72) Inventor Shigeki Yamamoto 4-chome Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture No. 1 Fujitsu Limited (72) Inventor Tomonori Yasumoto 4-1-1 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa F-term within Fujitsu Limited (reference) 5K101 MM04 NN02 NN32 NN34 NN35 QQ00 QQ01 UU03 UU05 UU13

Claims (2)

[Claims] 1. A ringer detection circuit, a hook detection circuit,
In a telephone connection device having a two-wire / four-wire conversion circuit and a DTMF detection circuit, and connecting a telephone and an information processing device to a telephone line, the ringer detection circuit does not detect a ringer sound for a certain period of time, and When the hook detection circuit detects an off-hook of the telephone, the information processing device is controlled to be able to transfer information to the telephone line via the 2-wire / 4-wire conversion circuit, and the DTMF detection circuit is connected to the telephone. And detects the numerical value / symbol input from the
A telephone connection device for notifying a sign. 2. A ringer detection circuit, a hook detection circuit,
A first connection switching means, a second connection switching means,
In a telephone connection device that has a TMF detection circuit, a power supply circuit, and a tone generation circuit, and connects a telephone and an information processing device to a telephone line, the ringer detection circuit does not detect a ringer sound for a certain period of time, and When the hook detection circuit detects an off-hook of the telephone, the telephone is disconnected from the telephone line by the first switching means, and is connected to the switching circuit by the second switching means; The circuit sends a dial tone to the telephone, and the DTMF detection circuit detects a numerical value / symbol input from the telephone and sends the numerical value / symbol to the information processing device.
A telephone connection device for notifying a sign.