KR100283759B1 - Interface apparatus for holding in common telephone/facsimile function in analogue facsimile system - Google Patents

Abstract

The present invention provides an analog facsimile system with a telephone, when using both a telephone and a facsimile through a single data communication channel and one codec, the analog signal required for the telephone and the facsimile is different from the analog signal of the telephone. It relates to a telephone / facsimile common interface device of an analog facsimile system in which the gain of the facsimile analog signal is adjusted and switched separately.

According to the present invention, there is an advantage that can provide a telephone function and a facsimile function using an analog facsimile system through a comprehensive information communication network which is a digital communication network.

Description

Interface apparatus for holding in common telephone / facsimile function in analogue facsimile system}

The present invention relates to a telephone / facsimile public interface for sharing a facsimile with a telephone in a single communication channel. More particularly, an analog facsimile system with a telephone (for example, a G3 facsimile system) is provided by an integrated information network (ISDN). The present invention relates to a telephone / facsimile common interface device of an analog facsimile system that interfaces telephone / facsimile switching and interface functions to use both a telephone and a facsimile using only a single data communication channel (ie, a 1B channel) of a service digital network.

Integrated Services Digital Network (ISDN) is a digital network that comprehensively supports voice and non-voice services. Public Switched Telephone Network (PSTN), Public Switched Data Network (PSDN), Telex, and Fax Dedicated Networks It refers to a digital communication network that converts all the different types of information such as voice and text data such as text and video data into digital ones and transmits them in one network at a time. G3 facsimile (or G3 facsimile) It refers to the Group 3 facsimile. The G3 facsimile is the most commonly used facsimile, which is used in analog networks.

While analog method, which is a general telephone method, provides only one channel, digital ISDN, which is a digital method, provides two channels as the basic rate interface (BRI) has a 2B + 1D channel structure as a basic structure. You can also use computer communication and fax at the same time you use the phone. In other words, when using different types of services, all operations can be performed in one integrated network (ISDN) without installing a separate line for each.

In addition, the ISDN has the advantage of high speed because there is no noise and less sound loss because the digital signal is exchanged as it is.

The characteristics of this Integrated Information Network (ISDN) are as follows in terms of subscribers and network providers.

First, in the existing network, the user had to separately manage the subscription fee and the service use number for each service, but in the integrated information communication network (ISDN), all things can be unified, so management is simplified. In addition, in spite of various communication functions and breakthrough communication capabilities, it is economically advantageous because the usage fee is relatively low.

Second, from the provider side, the previous analog telephone network was difficult to expand network functions, costly to construct a network, and difficult to provide a complex service, but it is easy to introduce a new service in an integrated information communication network (ISDN), Complex services can be provided at the same time, and network configuration and application can be economically performed.

In the above-described integrated information network (ISDN), the present invention provides an analog facsimile system with a telephone in which a single data communication channel (ie, 1B channel) and one codec (CODEC / Coder /) of the integrated information communication network (ISDN) are used. Provides telephone / facsimile switching and interface functions for both telephone and facsimile using Decoder only, analog to provide telephone and facsimile functions selectively using an analog facsimile system over a digital telecommunication network. Its purpose is to provide a telephone / facsimile common interface device of a facsimile system.

1 is a block diagram showing a preferred embodiment of a telephone / facsimile public interface device of an analog fax system according to the present invention;

2 is a circuit diagram showing the switching circuit unit according to the present invention;

3 is a circuit diagram illustrating a hook on / off circuit of a typical facsimile system.

<Explanation of symbols for main parts of the drawings>

10: telephone handset 20: facsimile modem

100: switching circuit unit 200: switching control unit

210: first multiplexer 220: second multiplexer

230: third multiplexer 240: fourth multiplexer

250: fifth multiplexer 300: codec

400: ISDN connection control unit R1: first resistor

R2: second resistor R3: third resistor

R4: fourth resistor R5: fifth resistor

R6: sixth resistor

In order to achieve the above object, the telephone / facsimile common interface device of the analog facsimile system according to the present invention, in the analog facsimile system having a telephone, uses both a telephone and a facsimile through a single data communication channel and one codec. In this case, since the magnitude of the analog signal required for the telephone and the facsimile is different, the gain of the analog signal of the telephone and the analog signal of the facsimile can be adjusted and switched separately.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the telephone / fax common interface device of the analog fax system according to the present invention will be described.

1 is a block diagram showing a preferred embodiment of a telephone / facsimile interface device of an analog facsimile system according to the present invention.

As can be seen from Figure 1, the preferred embodiment of the present invention provides a facsimile function through the facsimile modem 20 while providing a telephone function through the telephone handset 10 in a single data communication channel of the integrated information network (ISDN) In the analog facsimile system to

An analog required by the facsimile modem 20 while switching a plurality of multiplexers to distinguish a first signal path that is a transmit / receive signal path of the fax modem and a second signal path that is a transmit / receive signal path of the telephone handset 10. Since the magnitude of the first analog signal, which is a facsimile signal, and the magnitude of the second analog signal, which is an analog telephone signal required by the telephone handset 10, are different, the switching circuit unit which adjusts the gain differently so that the magnitude of the required signal is satisfied. 100;

As the operation mode of the facsimile system is switched to the telephone mode or the facsimile mode, a MUX control signal is applied to the switching circuit unit so that the plurality of multiplexers included in the switching circuit unit 100 according to the operation mode. A switching controller 200 for controlling to be switched;

Or analog-to-digital conversion to the first digital signal or the second digital signal, respectively, for transmitting the first analog signal or the second analog signal whose gain is adjusted differently through the Integrated Services Digital Network (ISDN); A codec (Coder / Decoder, 300) for digitally / analog converting the first digital signal or the second digital signal received at an ISDN into the first analog signal or the second analog signal; And

The ISDN access control unit 400 receives dialing information provided from the facsimile system and satisfies a standard required for accessing the ISDN.

With reference to the accompanying drawings, a preferred embodiment of the telephone / facsimile public interface device of the analog facsimile system according to the present invention configured as described above will be described in detail.

First, the switching control unit 200 applies a MUX control signal to the switching circuit unit as the operation mode of the facsimile system is switched to the telephone mode or the facsimile mode, so that the plurality of switching circuit units 100 are included in the switching circuit unit 100. The multiplexer is controlled to switch according to the operation mode.

When a mux control signal is required, the switching control unit 200 latches a necessary signal by sending a signal necessary for mux control to a data bus together with a mux enable signal from a facsimile system that is a main system. Control the multiplexer.

Accordingly, the switching circuit unit 100 switches the multiplexers to distinguish the first signal path, which is a transmission / reception signal path of the facsimile modem, and the second signal path, which is a transmission / reception signal path of the telephone handset 10. Since the magnitude of the first analog signal, which is an analog facsimile signal required by the modem 20, and the magnitude of the second analog signal, which is an analog telephone signal required by the telephone handset 10, are different, the magnitude of the required signal is satisfied. Adjust gain as different as possible.

2 is a circuit diagram illustrating the switching circuit unit 200 according to the present invention.

As shown in FIG. 2, the switching circuit unit 100 is connected to a transmitter of the facsimile modem 20 to a first input terminal, a transmitter of the telephone handset 10 is connected to a second input terminal, and an output of the switching circuit unit 100 is connected to the codec ( A first multiplexer 210 connected to a first transmit input terminal (-Tx) of 300;

A first resistor (R1) and a second resistor (R2) which are sequentially connected in parallel to the output terminals of the first multiplexer (210) to provide a current path for adjusting the gain for the first analog signal;

A third resistor (R3) and a fourth resistor (R4), which are sequentially connected in parallel to the output terminals of the first multiplexer (210) to provide a current path for adjusting the gain for the second analog signal;

A common contact between the first resistor R1 and the second resistor R2 is connected to a first input terminal, a third resistor R3 and a fourth resistor R4 are connected to a second input terminal, and an output terminal is connected to the codec ( A second multiplexer 220 connected to a second transmit input terminal TxI of 300;

A third multiplexer (230) having said second resistor (R2) connected to a first input terminal and a fourth resistor (R4) connected to a second input terminal;

The fifth resistor R5 connected to the output terminal of the third multiplexer 230 is connected to the first input terminal and the sixth resistor connected to the common contact between the output terminal of the third multiplexer 230 and the fifth resistor R5. A fourth multiplexer 240 having a resistor R6 connected to a second input terminal and an output terminal connected to a receiving output terminal RxO of the codec 300;

A receiver of the facsimile modem 20 is connected to a first input terminal, a receiver of the telephone handset 10 is connected to a second input terminal, an output terminal of the third multiplexer 230 and the fifth resistor R5 and And a fifth multiplexer 250 connected to the common contact of the sixth resistor R6.

In this case, the first multiplexer 210, the second multiplexer 220, the third multiplexer 230, the fourth multiplexer 240, and the fifth multiplexer 250 are each multiplexers 210, 220, 230, 240, and 250. Receiving a mux control signal of the switching control unit 200 through the control input of the first mode of the multiplexer (210, 220, 230, 240, 250) in the facsimile mode are all connected to the respective output terminals and in the telephone mode The second input terminals of each multiplexer 210, 220, 230, 240, 250 are all connected to the respective output terminals.

By default, the first input terminals of each of the multiplexers 210, 220, 230, 240, and 250 are all connected to the respective output terminals.

On the other hand, the first resistor R1, the second resistor R2, and the sixth resistor R6 gain gain so that the magnitude of the first analog signal, which is an analog facsimile signal required by the facsimile modem 20, is satisfied in the facsimile mode. The third resistor R3, the fourth resistor R4, and the fifth resistor R5 are gained so that the magnitude of the second analog signal, which is the analog telephone signal required by the telephone handset 10, is satisfied in the telephone mode. Adjust it.

The codec 300 converts the first analog signal or the second analog signal whose gain is differently adjusted into a first digital signal or a second digital signal to transmit the first analog signal or the second analog signal through the ISDN, respectively. The first analog signal or the second analog signal is outputted through a transmission output terminal (TDD) or received from the integrated information network (ISDN) via a reception input terminal (RDD). To digital / analog conversion.

The ISDN access control unit 400 receives dialing information provided from the facsimile system and satisfies a standard required for accessing the integrated information communication network (ISDN).

In order to facilitate understanding of the present invention, the operation procedure for each case, such as when using a telephone, using a facsimile, using a fax after a telephone call, etc. Let's explain.

3 is a circuit diagram illustrating a hook on / off circuit of a typical facsimile system.

First, the case of using the telephone handset, when the hook-up (HOOK-OFF) by lifting the telephone handset 10 mounted on the facsimile system, in the facsimile system through the hook on / off circuit as shown in FIG. Allows you to detect hook off status.

When the facsimile system detects a hook-off, the facsimile system provides the switching circuit unit 100 with the necessary mux control signal through the switching controller 200 shown in FIG. 2.

The codec 300 is controlled by controlling the multiplexers in the use of the telephone handset 10 only (ie, the telephone mode) so that the second input terminals of each of the multiplexers 210, 220, 230, 240 and 250 of FIG. 2 are all connected to the respective output terminals. Route the path to the telephone handset 10 only.

The ISDN access control unit 400 receiving dialing information from the facsimile system connects to the integrated information communication network (ISDN) using the dialing information provided from the facsimile system.

Then, after various ISDN connection-related messages are processed, a telephone call is made through the IS channel B channel (data communication channel).

When the telephone call is terminated, a mux control signal is applied so that all of the first input terminals of the multiplexers 210, 220, 230, 240, and 250 are connected to the respective output terminals.

Secondly, when using the facsimile, when the connection is attempted by the facsimile's hook-on dialing, the facsimile system and the switching control unit 200 apply a mux control signal to each of the multiplexers 210, 220, 230, 240, and 250. 1 Only the dialing information is sent to the ISDN access controller 400 while all input terminals remain connected to the respective output terminals. Accordingly, the ISDN access controller 400 accesses the ISDN using the dialing information. Done.

After the various ISDN connection-related messages are processed, the facsimile is communicated through the ISDN B channel (data communication channel).

Third, when using a facsimile after a phone call, that is, first picking up the phone handset 10, dialing, and talking to the other party and attempting facsimile communication, the telephone handset 10 mounted in the facsimile system is described. For example, when the hook-off (HOOK-OFF), the hook on / off circuit unit as shown in Figure 3 allows the facsimile system to detect the hook off state.

When the facsimile system detects a hook-off, the facsimile system provides the switching circuit unit 100 with the necessary mux control signal through the switching controller 200 shown in FIG. 2.

By controlling each multiplexer when using only a telephone handset (i.e., telephone mode), the second input terminals of each multiplexer 210,220, 230,240,250 in FIG. 2 are all connected to the respective output terminals. Make it towards the phone handset 10 only.

The ISDN access control unit 400 receiving dialing information from the facsimile system connects to the integrated information communication network (ISDN) using the dialing information provided from the facsimile system.

Then, after the user presses the fax's START KEY (i.e., takes some action for facsimile communication), when the phone handset 10 is put down (ie, HOOK-ON), the fax system The switching control unit 200 is notified to recognize the operation and change the mux control signal.

That is, the switching control unit 200 applies a mux control signal so that all of the first input terminals of the multiplexers 210, 220, 230, 240, and 250 are connected to the respective output terminals. In this case, while controlling each multiplexer 210,220, 230,240,250, the B channel of the ISDN should remain intact.

After that, the facsimile communication is performed through the B channel of the ISDN, and when the facsimile communication is terminated, the connection with the ISDN is disconnected while the first input terminals of the respective multiplexers 210, 220, 230, 240, and 250 are all connected to the respective output terminals. .

Terminologies used herein are terms defined in consideration of functions in the present invention, which may vary according to the intention or customs of those skilled in the art, and the definitions should be made based on the contents throughout the present application. will be. Although specific embodiments of the invention have been described and illustrated, it will be apparent that the invention may be embodied in various modifications by those skilled in the art.

In addition, since the present invention has been described through the preferred embodiment of the present invention, in view of the technical difficulty aspects of the present invention, those having ordinary skill in the art can easily be different from another embodiment of the present invention. As modifications may be made, it is obvious that both the embodiments and modifications cited in the above description belong to the appended claims.

As described in detail above, in an analog facsimile system having a telephone, when both the telephone and the facsimile are used through a single data communication channel and one codec, the size of the analog signal required for the telephone and the facsimile is different. According to the present invention for switching the gain of the analog signal of the telephone and the analog signal of the facsimile separately, the advantage of providing a telephone function and a facsimile function using an analog facsimile system through a comprehensive telecommunication network, which is a digital communication network. have.

Claims (3)

An analog facsimile system for providing facsimile functionality through a facsimile modem while simultaneously providing telephony functionality through a telephone handset in a single data communication channel of a digital communications network. A first analog signal that is an analog facsimile signal required by the facsimile modem while switching a plurality of multiplexers to distinguish a first signal path that is a transmission / reception signal path of the fax modem and a second signal path that is a transmission / reception signal path of the telephone handset. A switching circuit unit for adjusting gain differently so that a magnitude of a signal required in each is satisfied as a magnitude of a signal and a magnitude of a second analog signal which is an analog telephone signal required by the telephone handset are different; As the operation mode of the facsimile system is switched to the telephone mode or the facsimile mode, a MUX control signal is applied to the switching circuit to control the multiplexers included in the switching circuit to be switched according to the operation mode. A switching control unit; And Or analog-to-digital conversion to the first digital signal or the second digital signal, respectively, to transmit the first analog signal or the second analog signal whose gain is adjusted differently through the digital communication network, or A codec for digitally / analog converting the received first digital signal or the second digital signal into the first analog signal or the second analog signal; And And a digital communication network connection control unit for receiving dialing information provided from the facsimile system and satisfying a standard required for accessing the digital communication network. The apparatus of claim 1, wherein the digital communication network is an integrated service digital network (ISDN). The method of claim 1, wherein the switching circuit unit, A first multiplexer having a transmitting portion of the facsimile modem connected to a first input terminal, a transmitting portion of the telephone handset connected to a second input terminal, and an output terminal connected to a first transmitting input terminal of the codec; First and second resistors sequentially connected in parallel to an output terminal of the first multiplexer to provide a current path for adjusting gain for the first analog signal; Third and fourth resistors sequentially connected in parallel to an output of the first multiplexer to provide a current path for adjusting gain for the second analog signal; A second multiplexer having a common contact between the first resistor and the second resistor connected to a first input terminal, the third resistor and the fourth resistor connected to a second input terminal, and an output terminal connected to a second transmit input terminal of the codec; Wow; A third multiplexer wherein the second resistor is connected to a first input terminal and the fourth resistor is connected to a second input terminal; A fifth resistor connected to an output terminal of the third multiplexer is connected to a first input terminal, a sixth resistor connected to an output terminal of the third multiplexer and a common contact of the fifth resistor is connected to a second input terminal, and an output terminal is connected to the codec; A fourth multiplexer connected to the receive output terminal of the multiplexer; And A fifth terminal of the facsimile modem connected to a first input terminal, a receiver of the telephone handset to a second input terminal, and an output terminal connected to an output terminal of the third multiplexer and a common contact of the fifth resistor and the sixth resistor; The facsimile mode includes a multiplexer, wherein the first multiplexer, the second multiplexer, the third multiplexer, the fourth multiplexer, and the fifth multiplexer receive a mux control signal of the switching controller through a control input terminal of each of the multiplexers. An analog facsimile system, in which the first inputs of each multiplexer are all connected to the respective outputs, and in the telephone mode, the second input terminals of each multiplexer are all connected to the respective outputs. Phone / facsimile public interface Device.