JP2002374370A - Adapter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adapter device for enabling calling over the Internet by using a telephone set, without having to use information input equipment or voice input/output equipment. SOLUTION: This adapter device includes a converting circuit for transmitting a received audio signal to the telephone set and transmitting a transmitting audio signal to the computer and a direction circuit for making the received audio signal pass in one direction from the computer to the converting circuit, making the transmitting audio signal pass in one direction from the converting circuit to the computer and blocking passing of the received audio signal in one direction from the conversion circuit to the computer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to connecting a telephone for inputting or outputting voice to a computer in order to transmit and receive voice signals between a computer and a voice transmitting / receiving apparatus via a network. Related to adapter devices.

[0002]

2. Description of the Related Art In recent years, Internet communication systems for transmitting and receiving voice signals via the Internet, which is one of computer networks, are becoming widespread. In the Internet call system, since a computer is used for connection to the Internet, it is necessary to input connection information necessary for connection with the other party's voice transmitting / receiving device, for example, a telephone number or a network address. Yes, it is necessary to input audio to the computer or output audio from the computer.

[0003]

However, in the conventional Internet communication system, an information input device such as a keyboard or a mouse connected to the computer is used for inputting the connection information. For the input / output of the audio, an audio input / output device such as a microphone or a speaker connected to the computer has been used. Therefore, if you are unfamiliar with handling the information input device or audio input / output device,
There is a problem that conversation cannot be easily performed in the Internet communication system.

[0004]

<Means for Solving the Problem><Structure> In order to solve the above problems, an adapter device according to the present invention uses a computer connected to a network to communicate with a voice transmitting / receiving device connected to the network. An adapter device for connecting a telephone to the computer to transmit and receive signals, wherein the adapter receives a voice signal transmitted from the voice transmitting / receiving device, received by the computer via the network, and output from the computer, to the telephone. A conversion circuit for transmitting and transmitting a transmission voice signal output from the telephone to the computer; and a transmission circuit disposed between the conversion circuit and the computer, wherein the reception is performed in one direction from the computer to the conversion circuit. Pass the audio signal and send it in one direction from the conversion circuit to the computer It passes the voice signal, characterized in that it comprises a direction circuit for blocking passage of the received audio signal from the converting circuit in one direction to the computer.

<Operation> In the adapter device according to the present invention,
The conversion circuit functions to transfer the received audio signal from the computer to the telephone, and to transfer the transmitted audio signal from the telephone to the computer in an alternating manner. In one direction from the computer to the telephone, pass the transmitted audio signal in one direction from the telephone to the computer, and prevent the received audio signal from returning from the computer to the computer.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of an adapter device according to the present invention will be described. <Specific Example 1> Prior to the description of the adapter device of Specific Example 1,
A communication system according to a first specific example including the adapter device will be described. FIG. 2 shows the configuration of the call system according to the first embodiment. As shown in FIG. 2, the telephone system 1000 of the first embodiment includes a computer 100 connected to the Internet and a monitor 20 connected to the computer.
0, a mouse 300, a keyboard 400, an adapter device 500, and a telephone 600 connected to the adapter device.

[0007] The computer 100 transmits and receives audio signals to and from the other party's audio transmitting / receiving apparatus, for example, a computer having audio input / output devices such as a microphone and a speaker, via the Internet, which is one of computer networks. Monitor 200, mouse 300 and keyboard 4
00 is an operation required for transmitting and receiving the audio signal, for example,
It is used to input and output information necessary for connecting to a service provider that provides an Internet call service and a computer on the other end of the Internet.
The telephone 600 is a general telephone well known in the art, and performs conversion between the voice signal and voice.

The adapter device 500 outputs a voice signal from the computer on the other end, which is received by the computer 100, ie, a received voice signal, to the telephone 600, and conversely, a voice signal output from the telephone 600, ie, a transmitted voice signal. Is transmitted to the other computer via the computer 100. In addition, it has a function of generating power for the telephone 600 from a home AC power supply. In order to perform the above function, a terminal SP for receiving the reception audio signal output from the speaker terminal of the computer 100 and the transmission audio signal output from the telephone 600 are output to a microphone terminal of the computer 100. A terminal MC, a terminal L1 and a terminal L2 for exchanging the reception audio signal and the transmission audio signal with the telephone 600, and a terminal AC for connection to the home AC power supply.

FIG. 1 shows the configuration of the adapter device of the first embodiment. As shown in FIG. 1, the adapter device 500 of the specific example 1 includes a transformer circuit 10, a direction circuit 20,
Power supply circuit 30, resistors R20-R25, R30 and R
31, capacitors C10 and C20, and choke coils L30 and L31.

The direction circuit 20 is connected to the terminals SP and MC and the transformer circuit 10. In the direction circuit 20, the resistor R20 is connected to the terminal SP, and the input impedance of the terminal SP is connected to the terminal SP in order to match the output impedance of the computer 100 shown in FIG. Is specified. The capacitor C20 is provided between the terminal SP and an operational amplifier OP20, which will be described later, and blocks a DC component included in the received audio signal, thereby passing only the received audio signal.

The operational amplifier OP20 forms an inverting amplifier together with the resistors R21 and R22, and passes the received audio signal output from the computer 100 in the direction of the transformer circuit 10. The operational amplifier OP21 is
Constitute a differential amplifier with the resistors R24 and R25,
The transmission audio signal output from the telephone 600 shown in FIG. 2 and supplied through the transformer circuit 10 is passed in the direction of the computer 100.
The received audio signal output from the computer 100 is prevented from returning to the computer 100.

The resistor R23 is connected to an operational amplifier OP20.
The output terminal of the operational amplifier OP20 is connected to the input terminal of the transformer circuit 10 to match the output impedance of the operational amplifier OP20 with the input impedance of the transformer circuit 10.
Specify the output impedance of

The transformer circuit 10 is connected to the direction circuit 20 and the terminals L1 and L2, and transmits the received voice signal output from the computer 100 to the telephone 600, and outputs the received voice signal from the telephone 600. The transmitted audio signal is transmitted to the computer 100. That is, the transformer circuit 10 transfers the received audio signal and the transmitted audio signal in one direction. The capacitor C10 is provided between the transformer circuit 10 and the terminal L1, and removes a DC component included in the transmission audio signal output from the telephone 600, similarly to the function of the capacitor C20 for the reception audio signal. .

The power supply circuit 30 is connected to the terminal AC and the terminals L1 and L2. For example, the power supply circuit 30 is a well-known AC-DC power conversion circuit. , The telephone 600
Generates the DC power used, for example, 24 V or 48 V DC, and supplies the DC power to the telephone 600 through the terminals L1 and L2. Resistors R30 and R
31 is provided at an output terminal of the power supply circuit 30;
It functions to limit the current of the DC power, and the choke coils L30 and L31 are connected in series to the resistors R30 and R31, and the reception audio signal and the transmission audio signal, which are AC signals, The power supply circuit 30
This function works so as not to be affected by the output impedance of the device.

FIG. 3 is a flowchart showing the operation of the telephone system according to the first embodiment. Hereinafter, the operation will be described with reference to this flowchart. In order to facilitate the explanation and understanding of the operation, the operator of the call system according to the first embodiment makes a call, connects to a service provider that provides a call service via the Internet via the Internet, and communicates with the other party through the service provider. Assume that you make an Internet call with the other party.

Step S100: Telephone 6 shown in FIG.
When the operator of the telephone 00 lifts the handset of the telephone 600, that is, goes off-hook, a switch (not shown) is switched in the telephone 600 in conjunction with the off-hook to form a DC loop circuit. Thus, the off-hook DC current is generated based on the DC power supplied from the power supply circuit 30. The off-hook DC current is supplied from the adapter device 500 to the telephone 600 via the terminals L1 and L2.

Step S110: When the user goes off-hook in step S100, the operator inputs the address of the homepage of the service provider using the keyboard 400 connected to the computer 100 shown in FIG. The computer 100, based on the input address,
For example, the service provider's home page is displayed on the monitor 200 in cooperation with a server device (not shown) provided in an Internet service provider. The operator then uses the keyboard 400 to send the telephone number of the voice transmitting / receiving device of the other party to the homepage of the service provider. Thereby, the service provider connects the operator's communication system 1000 to the voice transmitting / receiving device of the other party's speaker.

Step S120: When the connection by the service provider is completed in step S110, the other party's voice transmitting / receiving device transmits a voice signal, that is, the received voice signal. The computer 100 receives the received audio signal via the Internet, and supplies the received audio signal to the adapter device 500 from the terminal SP.

Step S130: The received voice signal passed to the adapter device 500 in step S120 is
First, impedance matching is performed by the resistor R20, and low-frequency components are removed by the capacitor C20. Next, the received audio signal is amplified by the operational amplifier OP20 and output in the direction of the transformer circuit 10. Here, the other operational amplifier OP21 prevents the received audio signal from returning to the computer 100 via the terminal MC. When output from the direction circuit 20, the received audio signal is subjected to matching of the output impedance of the operational amplifier OP20 by the resistor R23,
At 0, AC conversion is performed. The received voice signal is finally output to the telephone 600 via the terminals L1 and L2.

Step S140: When a voice signal is given in step S130, telephone set 600 converts the received voice signal into voice by a receiver, and outputs the voice to the operator. Step S150: When the operator inputs voice from the receiver of the telephone 600, the telephone 600 converts the voice into the transmission voice signal by the receiver, and converts the transmission voice signal to the adapter device via the terminals L1 and L2. 50
0 is supplied.

Step S160: The transmission audio signal output to the adapter device 500 in step S150 is first subjected to the removal of low-frequency components by the capacitor C10. Next, the transmission audio signal is subjected to AC conversion in the transformer circuit 10. The transmitted voice signal is finally sent to the direction circuit 2
0, the signal is output in the direction of the terminal MC.
0 is supplied. Step S170: Step S160
, The computer 100 transmits the transmission audio signal to the other party's audio transmission / reception device via the Internet.

As described above, in the adapter device 500 of the first embodiment, the transformer circuit 10 for performing the AC conversion and the direction circuit 20 for permitting the audio signal in one direction are provided between the computer 100 and the telephone 600. Since the received audio signal and the transmitted audio signal are transferred, the conventional general-purpose telephone 600 can be used without using a conventional audio input / output device such as a microphone and a speaker connected to a computer. It is possible to easily input and output voice using the receiver.

In the adapter device 500 of the first embodiment, since the power supply circuit 30 supplies DC power for driving the telephone 600 and for making the call, the telephone 60
It is possible to detect off-hook due to 0.

<Embodiment 2> An adapter device according to Embodiment 2 of the present invention will be described. The adapter device of the second embodiment is characterized in that, in addition to the function of the first embodiment, a function of transmitting the address of the homepage of the service provider on behalf of the operator is provided. As in the description of the specific example 1, prior to the description of the adapter device of the specific example 2, the specific example 2
A communication system including the adapter device will be described.

FIG. 4 shows the configuration of the telephone system according to the second embodiment. As shown in FIG. 4, the call system 2000 of the specific example 2 includes a computer 100, a monitor 200, a mouse 300, a keyboard 400, and an adapter device 500, similarly to the call system 1000 of the specific example 1.
And a telephone 600. Call system 2 of specific example 2
000, the terminal KB_A, which is a keyboard terminal of the adapter device 500, and the keyboard terminal, which is a terminal of the computer 100 for input / output by the keyboard 400, are connected, unlike the call system 1000 of the specific example 1. A terminal KB_B, which is another keyboard terminal related to the terminal KB_A, is connected to the keyboard 400.

FIG. 5 shows the configuration of the adapter device 500 according to the second embodiment. Since the adapter device 500 according to the second embodiment has substantially the same configuration as the adapter device 500 according to the first embodiment, differences between the two adapter devices will be mainly described below.
The adapter device 500 of the specific example 2 includes a DC-DC converter 40 instead of the power supply circuit 30 of the specific example 1. DC
The DC converter 40 generates DC power for the telephone 600 described in the first embodiment from DC power supplied from the computer 100 via the terminal KB_A, for example, 5 V DC.

The adapter device 500 according to the second embodiment also includes
Unlike the adapter device 500 of the specific example 1, the detection circuit 50
And a control circuit 60. The detection circuit 50 is connected to the terminal L1 and the terminal L2.
An off-hook current flowing through the terminal 1 and the terminal L2 is detected, and the control circuit 60 is notified of the detection of the off-hook current.

The control circuit 60 includes a detection circuit 50 and a terminal K
B_A and a terminal KB_B, the CPU 61, a storage unit 62, and an I / O port 63 for transmitting the address of the service provider via the computer 100.
And The address of the service company's homepage is stored in the storage unit 62 in advance.
When the detection circuit 50 notifies that the off-hook of the telephone 600 is detected via the I / O port 63, the address of the service agent stored in the storage unit 62 is stored in the I / O port 63. To the computer 100 via the terminal KB_A.

In the adapter device 500 of the embodiment 2, FIG.
Terminal KB_A and terminal KB_B shown in FIG. 5 are connected to each other as shown in FIG. This allows the address of the service provider to be input to the computer 100 from the adapter device 500, or more precisely, the control circuit 60 in the adapter device 500, and the keyboard 400
To the computer 100.

FIG. 6 is a flowchart showing the operation of the telephone system according to the second embodiment. Hereinafter, the operation will be described with reference to this flowchart. Step S200: Specific Example 1
When the off-hook current flows through the terminals L1 and L2 in the same manner as in step S100 of FIG.
Detects the off-hook current. Upon detecting the off-hook current, the detection circuit 50 notifies the control circuit 60 of the detection of the off-hook current. That is, the detection circuit 50
Sends a message to the CPU 6 via the I / O port 63
Notify 1.

Step S210: When notified of the detection of the off-hook current, the CPU 61 reads the address of the service provider from the storage unit 62, and reads the read address from the I / O port 63 to the terminal KB_.
A is sent to the computer 100 via A. The computer 100 displays the home page of the service provider on the monitor 200 based on the address, for example, in cooperation with the server device, as in the first embodiment. Since then
As in the specific example 1, the operator inputs the telephone number of the voice transmission / reception device of the other party on the homepage of the service provider by using the keyboard 400 connected to the computer 100, so that the operator's A call can be made between the call system 2000 and the other party's voice transmitting / receiving device.

As described above, the adapter device 500 of the second embodiment includes the transformer circuit 10, the direction circuit 20, and the DC circuit.
Since the DC converter 40 is provided, the reception audio signal and the transmission audio signal can be transferred between the computer 100 and the telephone 600 in the same manner as the adapter device 500 of the first embodiment. Since the control circuit 60 outputs the address of the service provider to the computer 100 in response to the detection of the off-hook current caused by the off-hook of the telephone 600, the operator needs to use the telephone system of the first embodiment. This makes it possible to make a call via the Internet without inputting the address using the keyboard 400.

<Embodiment 3> The adapter device of Embodiment 3 will be described. The adapter device 500 of the specific example 3 outputs to the computer 100 the dial number, that is, the telephone number of the other party's voice transmitting / receiving device, which is input by a dialing signal by the operator's operation of the telephone, in addition to the function of the specific example 2. It is characterized by doing.

FIG. 7 shows the configuration of the adapter device of the third embodiment. As shown in FIG. 7, the adapter device 500 of the third embodiment has a configuration substantially similar to that of the second embodiment. In addition, the connection relationship in the communication system including the adapter device 500 of the specific example 3 is the same as that of the adapter device 500 of the specific example 2.
This is the same as the connection relationship in the communication system shown in FIG. Hereinafter, differences between the adapter device of the third embodiment and that of the second embodiment will be mainly described.

As shown in FIG. 7, the adapter device 500 of the third embodiment further includes a DTMF detection circuit 70 in addition to the configuration of the second embodiment. The DTMF detection circuit 70 is provided between the output terminal of the operational amplifier OP21 and the control circuit 60, and detects a DTMF signal corresponding to a dial operation output from the telephone 600 when the telephone 600 is a DTMF telephone. . When the telephone 600 is a dial pulse type telephone, the telephone 600
The dial pulse signal corresponding to the dial operation output by the detection circuit 50 is detected by the detection circuit 50 that can detect the off-hook current described in the second embodiment. The DTMF detection circuit 70 and the detection circuit 50 output the detected dialing signal, that is, the detected DTMF signal and dial pulse signal to the control circuit 60. When the dialing signal is given, the control circuit 60 converts the dialing signal into a signal that can be accepted by the computer 100 and outputs the converted signal to the computer 100 via the terminal KB_A.

FIG. 8 is a flowchart showing the operation of the communication system of the third embodiment. Hereinafter, the operation will be described with reference to this flowchart. Step S300: Specific example 2
Monitor 20 in the same manner as the operation in step S210 of FIG.
After the homepage of the service provider is displayed at 0, the operator inputs the telephone number of the voice transmitting / receiving device of the other party using the telephone 600, and the telephone 600 receives a DTMF signal or dial pulse representing the inputted telephone number. A dialing signal, which is a signal, is output to the adapter device 500 via the terminals L1 and L2.

Step S310: In the adapter device 500, when the DTMF detection circuit 70 or the detection circuit 50 detects the DTMF signal or the dial pulse signal,
The detected signal is sent to the CPU 6 via the I / O port 63.
Output to 1. When supplied with the DTMF signal or the dial pulse signal, the CPU 61 converts the signal into a signal receivable by the computer 100 and outputs the converted signal to the computer 100 via the terminal KB_A. When the computer 100 receives the signal from the adapter device 500, similarly to the adapter device 500 of the first and second embodiments, the computer 100 displays the voice of the other party represented by the received signal on the homepage of the service provider. Transmit the telephone number of the transmitting / receiving device. Thereafter, in the same manner as in the specific examples 1 and 2, the call system of the operator and the voice transmitting / receiving device of the other party make a telephone call via the Internet.

As described above, in the adapter device 500 of the embodiment 3, in addition to the functions of the adapter device 500 of the embodiment 2, the DTMF detection circuit 70 or the detection circuit 50 has Upon detecting the signal, the control circuit 60 converts the detected dialing signal for the computer 100 and outputs the converted signal to the computer 100. Thus, the operator operates the dialing button of the telephone 600, which is conventionally used, without using the keyboard 400 connected to the computer 100, thereby changing the telephone number of the voice transmitting / receiving apparatus of the other party to the service provider. Can be sent to the homepage.

<Embodiment 4> An adapter device according to Embodiment 4 of the present invention will be described. Adapter device 5 of specific example 4
No. 00 is characterized in that a call originated by the voice transmitting / receiving device of the other party is received via a computer and a telephone connected to the adapter device is called.

FIG. 9 shows the configuration of the adapter device of the fourth embodiment. The adapter device 500 of the specific example 4 has a configuration similar to that of the adapter device 500 of the specific example 3 except that a call detection circuit and a ringing circuit described later are provided. The connection relationship in the communication system including the adapter device 500 of the specific example 4 is the same as the connection relationship in the communication system of the adapter device 500 of the specific example 3, that is, the communication system of the specific example 2 shown in FIG. is there. Hereinafter, the adapter device 5 of the specific example 4
The difference between 00 and that of the third embodiment will be mainly described.

The adapter device 500 according to the fifth embodiment has a called detection circuit 80 and a ringing circuit 90 in addition to the configuration of the adapter device 500 according to the third embodiment. Called detection circuit 80
Is connected to the output terminal of the direction circuit 20, and the other party's voice transmitting / receiving apparatus detects the transmission of the received voice signal, that is, a call signal indicating a call to be transmitted prior to the start of a call, and The control circuit 60 is notified of a called detection signal indicating that the call has been received.

The sounding circuit 90 includes a control circuit 60, a DC-D
The control circuit 60 is connected to the C converter 40 and the terminals L1 and L2, and responds to a ringing start signal output when the control circuit 60 receives the called detection signal from the called detection circuit 80. A driving signal including a high voltage such as 180 V for driving a calling mechanism such as a bell is output to the telephone set 600 via the terminals L1 and L2.

FIG. 10 is a flowchart showing the operation of the telephone system of the fourth embodiment. Hereinafter, the operation will be described with reference to this flowchart. In this flowchart,
In order to facilitate the explanation and understanding of the operation, it is assumed that the communication system according to the fourth embodiment receives a call from the voice transmitting / receiving device of the other party.

Step S400: Computer 100
Upon receiving the calling signal transmitted by the other party's voice transmitting and receiving device prior to the call via the Internet, receiving the calling signal, that is, a called signal representing a called,
Output to the adapter device 500 via the terminal SP. The computer 100 transmits the called signal to the computer 100
It is generated using a specific frequency component that is predetermined between the adapter and the adapter device 500.

Step S410: In the adapter device 500, when the called detection circuit 80 detects the called signal, the control circuit 6 sends the called detection signal indicating that a call has been received.
Output to the CPU 61 via the I / O port 63 in 0.

Step S420: The CPU 61, upon receiving the called detection signal, outputs a ringing start signal for instructing the telephone 600 to start ringing to the ringing circuit 90 via the I / O port 63. When the ringing circuit 90 receives the ringing start signal, the ringing circuit 90 outputs a driving signal for driving a ringing mechanism in the telephone 600, for example, a driving signal having a high voltage and including continuous pulses as described above to the terminal L.
1 and output to the telephone 600 via the terminal L2. Accordingly, the ringing mechanism of telephone 600 generates a ringing tone for calling the operator.

Step S430: When the operator of the telephone 600 lifts the handset of the telephone 600 in response to the ringing of the ringing mechanism by the drive signal, that is, goes off-hook, the telephone 600 sends the off-hook current via the terminals L1 and L2. Output to the adapter device 500. Step S440: In the adapter device 500, when the detection circuit 50 detects the off-hook current,
Via the / O port 63, an off-hook detection signal indicating that the off-hook current has been detected, that is, the telephone 600 has gone off-hook, is output to the CPU 61.

Step S450: Upon receiving the off-hook detection signal, the CPU 61 sends a ringing end signal for terminating the driving of the ringing mechanism in the telephone set 600 by the ringing circuit 90 via the I / O port 63 to the ringing circuit. 90. Upon receiving the ringing end signal, the ringing circuit 90 ends the output of the drive signal for driving the ringing mechanism. Thus, the ringing of the drive mechanism in the telephone 600 is terminated, that is, the ringing tone is stopped.

After the ringing is finished, the telephone 6
00 performs a predetermined operation necessary for connection with the voice transmission / reception device of the other party by using the monitor 200 and the keyboard 400 connected to the computer 100, whereby the communication system and the voice transmission / reception of the other side are performed. The connection between the devices is established. Thereafter, the adapter device 500 transfers the received audio signal and the transmitted audio signal between the computer 100 and the telephone 600 in the same manner as in the specific examples 1 to 3.

As described above, in the adapter device 500 of the fourth embodiment, when the other party's voice transmitting / receiving device makes a call, the called detection circuit 80 detects the call, and the ringing circuit 90 detects the detected call. Then, the operator of the telephone 600 is notified of the called by starting the ringing of the ringing mechanism in the telephone 600 based on the. On the other hand, if the operator goes off-hook on telephone 600 in response to the
Detects the off-hook by the off-hook current,
The ringing circuit 90 terminates the driving of the ringing mechanism in the telephone 600 based on the detected off-hook.
Therefore, the operator of the telephone 600 can use the computer 1
00. A conventionally familiar call to indicate a call originating from a ringing mechanism in the telephone 600 without hearing the computer specific ring to indicate the call originating from a speaker connected to 00. By listening to the sound, the called party can be recognized.

[0051]

According to the adapter device of the present invention, as described above, the transformer circuit and the direction circuit are:
Since the computer and the telephone connected to the computer via the adapter device according to the present invention transfer each of the received voice signal and the transmitted voice signal in one direction, the operator operates the computer. It is possible to easily perform a conversation via the computer network using the telephone without using a voice input / output device such as a microphone and a speaker connected to the telephone.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an adapter device of a specific example 1.

FIG. 2 is a diagram illustrating a configuration of a call system according to a first embodiment;

FIG. 3 is a flowchart illustrating an operation of the telephone system according to the first embodiment.

FIG. 4 is a diagram illustrating a configuration of a call system according to a specific example 2.

FIG. 5 is a diagram illustrating a configuration of an adapter device of a specific example 2.

FIG. 6 is a flowchart showing the operation of the telephone system according to the second embodiment.

FIG. 7 is a diagram illustrating a configuration of an adapter device according to a third embodiment;

FIG. 8 is a flowchart showing the operation of the telephone communication system according to the third embodiment.

FIG. 9 is a diagram illustrating a configuration of an adapter device of a specific example 4.

FIG. 10 is a flowchart showing the operation of the telephone communication system of Example 4;

[Explanation of symbols]

 Reference Signs List 10 transformer circuit 20 direction circuit 30 power supply circuit 500 adapter device

Claims (10)

[Claims] 1. An adapter device for connecting a telephone to a computer for transmitting / receiving a voice signal to / from a voice transmitting / receiving device connected to the network through a computer connected to the network, the voice transmitting / receiving device comprising: A conversion circuit for transmitting a received audio signal output from the computer to the telephone and transmitting a transmission audio signal output from the telephone to the computer; Disposed between the conversion circuit and the computer, passing the received audio signal in one direction from the computer to the conversion circuit, and transmitting the transmission audio signal in one direction from the conversion circuit to the computer; The received voice in one direction from the conversion circuit to the computer Adapter device characterized in that it comprises a direction circuit for blocking passage of US. 2. A power supply circuit for supplying power to the telephone so as to obtain an off-hook current from the telephone for detecting an off-hook operation from the telephone to the voice transmitting / receiving device by the telephone. The adapter device according to claim 1. 3. An off-hook detection circuit for detecting the off-hook current; and when the off-hook detection circuit detects the off-hook current, connection information necessary for connection between the telephone and the voice transmitting / receiving device is transmitted to the computer. 3. The adapter device according to claim 2, further comprising a control circuit that outputs the signal. 4. A dialing detection circuit for detecting a dialing signal generated by the telephone when the telephone receives a dial operation, wherein the control circuit includes a dialing detection circuit which detects the dialing signal. 4. The adapter device according to claim 3, wherein when detected, the connection information corresponding to the dialing signal is output to the computer. 5. The adapter device according to claim 2, wherein the power supply circuit is a converter circuit that generates the power to be supplied to the telephone from commercial AC power. 6. The adapter device according to claim 2, wherein the power supply circuit is a converter circuit that generates power to be supplied to the telephone from DC power output from the computer. 7. The apparatus according to claim 2, further comprising a resistor for limiting a current of electric power supplied to said telephone.
The described adapter device. 8. The adapter device according to claim 1, wherein the network is the Internet. 9. The directional circuit includes an inverting amplifier circuit including an operational amplifier for passing the received audio signal, and a differential amplifier including an operational amplifier for passing the transmitted audio signal and blocking the audio signal. The adapter device according to claim 1, further comprising a circuit. 10. A call detection circuit for detecting a call signal output from the computer when the telephone receives a call from the voice transmission / reception device via the network, and the call detection circuit A ringing output circuit for outputting a ringing signal for ringing the telephone to the telephone when the ringing signal is detected; and a ringing signal output from the telephone in response to the ringing signal and indicating the recognition of the ringing signal. 2. The adapter device according to claim 1, further comprising: a ring control circuit for stopping output of said ring signal to said telephone by said ring output circuit based on a call recognition signal.