JPH0239764A - Modem device - Google Patents

Abstract

PURPOSE:To execute data communication without depending on an acoustic coupler as usual by pulling in a signal line from a telephone set, selecting either one of a receiver of the telephone set or a modulator-demodulator in a MODEM device for the signal line, and switching and connecting it. CONSTITUTION:When a telephone set 10 is used as the network controller of the data communication, a selective switch 24 selects a modulator- demodulator 25 side. A signal from a communication opponent is sent through the telephone set 10 and the selective switch 24 to the modulator-demodulator 25, demodulated by the modulator-demodulator 25, and sent to an interface circuit 26. The interface circuit 26 converts the sent signal, and sends it to a terminal device 30. The signal transmitted from the terminal device 30 is sent to the interface circuit 26. The interface circuit 26 sends the signal to the modulator-demodulator 25. The modulator-demodulator 25 modulates the sent signal, and sends it through the selective switch 24 to the telephone set 10. Thus, the telephone set 10 can be used as the data communication in addition to the use of the normal telephone set.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is utilized in a modem device of a data communication system using a telephone.

The present invention relates to a modem device, and more particularly to a modem device used when a telephone is used as a network control device to perform data communication.

〔overview〕

The present invention provides a modem device that performs data communication using a telephone, which takes in a signal line from the telephone, and selects either the handset of the telephone or the modem in the modem for this signal line. By making it possible to switch connections using the LAN, it is possible to perform data communication without using an acoustic coupler as in the past.

[Conventional technology]

Conventionally, general telephones were converted to MM (manual/manual)
When used as a type of network control unit (NCU), an acoustic coupler was used. The use of an acoustic converter has the advantage of allowing easy and economical data communication.

The structure and usage example of the acoustic coupler are as shown in FIG. The main body of the acoustic coupler 40 includes a receiver 11 of a telephone 10.
can be set. The signal sent from the communication partner is once converted into sound by the speaker 14 of the receiver 11. The sound is received by a microphone 41 and a demodulator 42
The signal is converted back into an electrical signal and transmitted to the terminal device 30 through the interface circuit 43. Further, the signal transmitted from the terminal device 30 passes through the interface circuit 43 and is sent to the modulator 4.
4 and the modulated signal is converted into sound by a speaker 45. By receiving the sound with the microphone 15 of the receiver 11, a signal is transmitted to the communication partner.

[Problem that the invention seeks to solve]

However, since the acoustic coupler uses a telephone receiver, the electrical signal is first converted into sound that travels through the air using a speaker, and then converted back into an electrical signal using a microphone. Therefore, it has the disadvantage that it is easily influenced by external noise and is not highly reliable.

Another disadvantage is that the acoustic coupler cannot be used depending on the shape of the receiver because it does not match the shape of the receiver.

Another drawback was that the handset had to be connected to the acoustic coupler each time data communication was performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a modem device that can be easily set for data communication without being affected by external noise and without restrictions due to its shape, by eliminating the above-mentioned drawbacks.

[Means for solving problems]

The present invention provides a modem device that is connected to a telephone and a terminal device and includes a modem that demodulates a signal from the telephone and modulates a signal from the terminal device, in which a first connection means for connecting the main body of the telephone is provided. and a second connection means for connecting the handset of the telephone, and a selection switch for selectively connecting either the second connection means or the modem to the first connection means. It is characterized by:

[Effect]

A first connection means (for example, a plug and outlet) connects the telephone body to the modem device, and a second connection means connects the handset to the modem device.

Then, when using the telephone as a normal telephone, the main body of the telephone is connected to a handset using a selection switch, and when performing data communication, the main body of the telephone is connected to a modem.

Therefore, by using a type of telephone that connects the main body and handset with a plug and outlet, data communication can be performed simply by switching the selection switch. There are no usage restrictions and it can be easily set for data communication.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In this embodiment, the main body of the telephone 10 is connected to a modem device 20 that is connected to a telephone 10 and a terminal device 30 and includes a modem 25 that demodulates a signal from the telephone 10 and modulates a signal from the terminal device 30. A signal line 21 with a plug 22 at the end serves as a first connection means, and an outlet 23 serves as a second connection means to which the handset 11 of the telephone 10 is connected.
and a selection switch 24 that selects and connects either the outlet 23 or the modem 25 to the signal line 21.

Note that 12 is an outlet attached to the main body of the telephone 100, 13 is a plug attached to the receiver 11, and 26 is an interface circuit.

A feature of the present invention is that, on the right side of FIG. 1, a signal line 21 with a plug 22 as a first connection means, an outlet 23 as a second connection means, and a selection switch 24 are provided.

Next, the operation of this embodiment will be explained.

When the telephone 10 is used as a normal telephone, the selection switch 24 selects the outlet 23 side.

The telephone receiver 11 is connected to the outlet 23 by a plug 13, and the telephone 10 can be used as a normal telephone.

When the telephone 10 is used as a data communication network control device, the selection switch 24 selects the modem 25 side. A signal from the communication partner is sent from telephone 10 to modulator/demodulator 25 via selection switch 24 .

An interface circuit 26 is connected to the modulator/demodulator 25 and demodulates the sent signal and sends it to the interface circuit 26. The interface circuit 26 converts the sent signal so that the terminal device 30 can receive it, and sends the signal to the terminal device 30. Further, a signal transmitted from the terminal device 30 is sent to the interface circuit 26. The interface circuit 26 transmits the sent signal to the modulator/demodulator 2.
5 is converted so that it can be received and sent to the modem 25. The modulator/demodulator 25 modulates the received signal and sends it to the telephone 10 via the selection switch 24.

As described above, the telephone 10 can be used not only as a normal telephone but also for data communication.

Although the signal line 21 drawn out from the selection switch 24 was used as the first connection means in the above-mentioned embodiment, this may be connected to an outlet via a plug in the same way as the telephone receiver 11.

〔Effect of the invention〕

As explained above, the present invention has the effect of not being affected by external noise because it does not convert an electrical signal into sound once, unlike when an acoustic coupler is used.

Another advantage is that a telephone whose handset is connected to a plug and an outlet can be used regardless of the shape of the handset.

Furthermore, it is possible to switch between using the telephone as a telephone or as a network control device, which has the effect of saving the effort of setting the telephone receiver into the acoustic coupler every time data communication is to be performed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a block diagram showing a conventional example. 10...Telephone, 11...Handset, 12.23...
・Outlet, 13.22...Plug, 14.45・
... Speaker, 15.41 ... Microphone, 20.
...Modem device, 21...Signal line, 24...Selection switch, 25...Modulator/demodulator, 26.43...Interface circuit, 30...Terminal device, 40...Acoustic coupler, 42 ... Demodulator, 44 ... Modulator.

Claims (1)

[Claims] 1. A modem device (25) that is connected to a telephone (10) and a terminal device (30) and includes a modem (25) that demodulates a signal from the telephone and modulates a signal from the terminal device. 2
0), first connection means (21, 2) for connecting the main body of the telephone;
2), a second connection means (23) for connecting the handset (11) of the telephone, and selecting either the second connection means or the modem for the first connection means; A modem device comprising a selection switch (24) for switching connection.