JPH01157661A - Interface device for data transmission equipment - Google Patents

Abstract

PURPOSE:To use data transmission equipment both for a wire communication and for a radio communication by switching the line of the transmitting signal and the line of the receiving signal of the data transmission equipment at the time of the wire communication with a telephone line and at the time of the radio communication with radio equipment by means of a switching circuit. CONSTITUTION:At the time of the wire communication and at the time of the radio communication, the line of a transmitting signal TD and the line of a receiving signal RD of facsimile equipment 1 are switched by a switching circuit 205. At the time of the wire communication, the line of the transmitting signal TD and the line of the receiving signal RD are connected through a transformer 204 to the telephone line. On the other hand, at the time of the radio communication, the transmitting signal TD of the facsimile equipment 1 is outputted to radio equipment 3, simultaneously, a signal received by the radio equipment 3 is outputted to the facsimile equipment 1, and a sound signal from a microphone 5 is outputted through the transformer 204 to the radio equipment 3 at the time of transmitting. Thus, only by the switching operation of the switching circuit 205, the facsimile equipment 1 can be easily used both for the wire communication and for the radio communication.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an interface device for a data transmission device for connecting the data transmission device to a telephone line and a radio to perform data transmission.

[Prior Art] A facsimile machine is generally connected to a subscriber telephone line,
Facsimile communication is carried out by wire. On the other hand, in recent years, facsimile devices such as in-vehicle facsimile devices have been connected to wireless devices, and facsimile communication by radio has become common.

However, in the past, facsimile machines were manufactured separately for wired and wireless facsimile machines, and there was a problem in that they could not be used for both purposes.

[Objective] An object of the present invention is to solve the problem described in item 1 and provide an interface device for a data transmission device that can be used in common for wired and wireless data transmission devices.

[Configuration] For this purpose, the present invention uses a switch circuit to switch the transmission signal line and reception signal line of the data transmission device between wired communication using a telephone line and wireless communication using a radio. During wired communication, the transmission signal line and the reception signal line are connected to a telephone line via a transformer, while during wireless communication, the transmission signal from the data transmission device is output to the radio, and the transmission signal from the data transmission device is output to the radio. The received signal is outputted to the data transmission device, and when transmitting a call, the audio signal from the microphone is outputted to the radio device via the transformer.

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

The figure shows a circuit configuration diagram of an interface device for a facsimile machine according to an embodiment of the present invention. In the figure, a facsimile machine 1 is connected to telephone lines L1 and L2 and a radio 3 via an interface circuit 2. Further, the interface device 2 is connected to a telephone 4 and a microphone 5 for transmitting speech with the radio 3 .

In the interface device 2, the telephone line line 1,
1 is connected to the relay 20 via the off-hook detection circuit 201.
The break side contact a1 is connected to the ringing detection circuit 203 and one line of the telephone 4. Telephone line line L2
is connected to the common terminal c2 of the relay 202, and its break side contact a2 is connected to the other line of the telephone 4.

The off-hook detection signal OF taken out from the off-hook detection circuit 201 is input to the system control section 11 of the facsimile machine 1. A switching signal EX from the system control unit 11 that becomes effective during wired communication is connected to one end of the winding of the relay 202, and the other end is connected to the power supply Vc. A ringing detection signal RG taken out from the ringing detection circuit 203 is input to the system control section 11.

Make-side contacts b1 and b2 of the relay 202 are connected to one winding of a transformer 204 for impedance matching. Further, the make side contact b2 side is grounded to the radio device 3 side. One end of the other winding of the transformer 204 is
The other end is connected to the contact g1 of the relay 206, and the contact d1 of the switch circuit 205 that switches between wired communication and wireless communication. Connected to d2. The common terminal j□ is connected to one end of the microphone nut 51 of the microphone 5, and the other end is grounded.

Further, the common terminal 12 of the relay 206 is connected to the transmitting circuit 31 of the radio device 3, and the receiving circuit 32 thereof is connected to one end of one winding of the hybrid transformer 207. The other end is connected to the break side contact h2 of the relay 206, and its center terminal is connected to the make side contact j of the relay 208. A common terminal of the relay 208 is connected to the transmission/reception switching circuit 33 of the radio device 3.

One end of the breath talk switch 52 of the microphone 5 is grounded, and the other end is input to the relay driver 209, 210. The output of relay driver 209 is connected to one end of the winding of relay 206, and the other end is connected to power supply VC. The I2 driver 210 forms a NOR circuit in which input signals are inverted by two people, and the transmission instruction signal TR from the system control section 11 is input to the other input.

The output of relay driver 210 is connected to one end of the winding of relay 208, and the other end of the winding is connected to power supply Vc. Contact g2 of relay 206 is connected to one end of one winding of transformer 204.

A contact e□ of the switch circuit 205 is connected to one end of the transmitting circuit 31, and the other end is grounded. Further, the variable terminal is connected to one end of the other winding of the hybrid transformer 207. The center terminal of the hybrid transformer 207 is grounded, and the other end is connected to one end of the variable resistor 212. The other end of the variable resistor 212 is grounded, and the variable terminal is connected to the filter 213. The output of the filter 213 is connected to a contact e2 of the switch circuit 205 via an amplifier 214. The common terminals f□ and lf2 of the switch circuit 205 are respectively connected to the modem 12 in the facsimile machine Nl.

A speaker 34 for receiving calls is connected to the receiving circuit 32 .

In the second configuration, in a standby state in which the facsimile machine M1 is not operating, the switching signal EX is turned off and the relay 202 is also turned off. This allows the telephone 4 to perform normal telephone calls over the telephone line.

In addition, in this standby state, the relay 208 is normally turned off and the radio device 3 is in a receiving state. Thereby, the voice of the other station can be received through the speaker 34 for receiving calls. Here, when the breath talk switch 52 is turned on, the relay 2
06 and relay 208 are turned on. As a result, the audio signal from the microphone unit 1-51 is transmitted to the common terminal "1" of the relay 206, the contact g1, the I-lance 204, and the relay 2.
The signal is input to the transmitting circuit 31 via contact g2 of 06 and contact 12. Further, the contact k of the relay 208 is connected to the ground line on the side of the radio device 3, and the transmitting circuit 31 is activated to enter a transmitting state. Thereby, it is possible to transmit a call from the microphone 5 to the other party's station.

On the other hand, when performing wired facsimile communication on the telephone line side, the switch circuit 205 is switched to the contact d□ldZ side.

Now, if this facsimile machine 1 is called from the telephone line, the ringing detection circuit 203 detects the calling signal and outputs a ringing detection signal RG to the system control section 11.

As a result, the system control unit 11 receives the switching signal r! ″X
Turn on, that is, I'll turn on the level and turn on relay 20.
Turn on 2 and connect the line. A signal received from the other party is sent to the modem 12 via an off-hook detection circuit 201, a relay 202, a transformer 204, and a switch circuit 205.
is input as the received signal RD. Furthermore, the transmission signal TD from the modem 12 is transmitted to the other party using the reverse route 1- to that described above.

By transmitting and receiving such signals, the facsimile machine executes a predetermined image transmitting and receiving process.

When making a call, the facsimile machine 1 is activated after dialing and calling the other party using the telephone 4. At this time, the system control unit 11 checks that the handset of the telephone 4 is raised based on the off-hook detection signal OF, and turns on the switching signal EX. If the handset is not in use, this operation is not performed.

Thereafter, as in the case of receiving a call, a predetermined image transmission/reception process is executed.

Next, when performing wireless facsimile communication using the radio device 3, the switch circuit 25 is switched to the el and e2 sides.

Then, the telephone 4 calls the other party's station, and when the other party answers, the facsimile machine 1 is activated.

When the facsimile machine 1 is activated, it operates in the same manner as described above, but only during the period when the modem 12 transmits the transmission signal TD, the transmission instruction signal TR is turned on, that is, II L II
Make it a rerel. When the transmission instruction signal TR reaches the 11 LI+ level, the relay 208 is turned on and the radio device 3 enters the transmission state. As a result, during the above period, the transmission signal TD
is input to the transmitting circuit 31 via the switch circuit 205, the variable resistor 21], the vibration resistor 1 to the transformer 207, and the relay 206, and is transmitted to the partner station.

Further, during other periods, signals received from the other station by the receiving circuit 32 are input to the modem 12 via the hybrid I-lance 207, the variable resistor 212, the filter circuit 213, the amplifier 214, and the switch circuit 205.

In this way, the process of transmitting and receiving a predetermined image wirelessly is executed.

As described above, in this embodiment, the transmission signal TD line and the reception signal RD line of the facsimile apparatus 1 are switched by the switch circuit 205 between wired communication and wireless communication, and the Transmission signal T
The line D and the line of the received signal RD are connected to the telephone line via the transformer 204, while the transmission signal TD of the facsimile machine 1 is connected to the radio 3 during wireless communication.
At the same time, the signal received by the radio 3 is output to the facsimile machine], and when transmitting a call, the audio signal from the microphone 5 is output to the radio 3 via the transformer 204.

As a result, the facsimile machine 1 can be easily used for both wired and wireless facsimile machines by simply switching the switch circuit 205.

In addition, the transformer 204 is connected to the modem 12 during wired communication.
It is used to match the impedance between the telephone line side and the telephone line side, and the microphone nut 51 is used during wireless communication.
It is used to match the impedance of the transmitter circuit 31 and the transmitter circuit 31. This allows one transformer 204 to be used effectively.

In the above embodiments, the case of a facsimile machine has been described, but it goes without saying that the present invention can be similarly applied to various data transmission apparatuses having a built-in modem and transmitting data over a telephone line.

[Effects] As described above, according to the present invention, the transmission signal line and the reception signal line of the data transmission device can be connected by a switch circuit during wired communication using a telephone line and during wireless communication using a wireless device. During wired communication, the transmission signal line and the reception signal line are connected to a telephone line via a transformer, while during wireless communication, the transmission signal of the data transmission device is output to the radio, and The received signal of the radio is output to the data transmission device, and when transmitting a call, the audio signal from the microphone is output to the radio via the transformer, so the data transmission device can be used for wired or wireless applications. It will be possible to share it with others.

[Brief explanation of the drawing]

The figure is a circuit configuration diagram of an interface device for a facsimile machine according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Facsimile device, 2...Interface circuit, 3...Radio device, 4...Telephone, 5...Microphone, 11...
Control circuit, 12. Modem, 201... Off-hook detection circuit, 202. 206, 208. Relay, 203... Ringing detection circuit, 204... Transformer, 205...
Switch circuit, 207 Hybrid transformer, 20
9.210...Relay driver, 31 transmission circuit, 32.
- Receiving circuit, 33... Transmission/reception switching circuit, 51... Microphone switch, 52... Breath talk switch.

Claims (1)

[Claims] A switch circuit that switches the transmission signal line and the reception signal line of the data transmission device during wired communication and wireless communication, and a switch circuit that switches the transmission signal line and reception signal line to one winding during the wired communication. a transformer connected to the other winding and having a telephone line connected to the other winding; a transmitting side signal circuit that outputs the transmitted signal of the data transmission device to the radio device during wireless communication; It is characterized by comprising a receiving side signal circuit that outputs to the receiving signal line of the transmission device, and a transmitting signal circuit that outputs the audio signal from the microphone to the radio device via the transformer when transmitting a voice. Interface device for data transmission equipment.