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WO1993005606A1 - Dispositif de telecommunications - Google Patents

Dispositif de telecommunications Download PDF

Info

Publication number
WO1993005606A1
WO1993005606A1 PCT/DE1992/000767 DE9200767W WO9305606A1 WO 1993005606 A1 WO1993005606 A1 WO 1993005606A1 DE 9200767 W DE9200767 W DE 9200767W WO 9305606 A1 WO9305606 A1 WO 9305606A1
Authority
WO
WIPO (PCT)
Prior art keywords
telephone
data
telephone device
dialing
interface
Prior art date
Application number
PCT/DE1992/000767
Other languages
German (de)
English (en)
Inventor
Gregor Verweyen
Original Assignee
Teleint Gesellschaft Für Computer- Und Telekommunikationsprodukte Mbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE4129949A external-priority patent/DE4129949A1/de
Priority claimed from DE4206933A external-priority patent/DE4206933A1/de
Application filed by Teleint Gesellschaft Für Computer- Und Telekommunikationsprodukte Mbh filed Critical Teleint Gesellschaft Für Computer- Und Telekommunikationsprodukte Mbh
Publication of WO1993005606A1 publication Critical patent/WO1993005606A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/274—Devices whereby a plurality of signals may be stored simultaneously with provision for storing more than one subscriber number at a time, e.g. using toothed disc
    • H04M1/2745—Devices whereby a plurality of signals may be stored simultaneously with provision for storing more than one subscriber number at a time, e.g. using toothed disc using static electronic memories, e.g. chips
    • H04M1/27485—Appending a prefix to or inserting a pause into a dialling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

Definitions

  • the invention relates to a telephone device according to the preamble of the main claim.
  • connections between the telephone network and computers are known in many ways.
  • modems are used for data and / or facsimile transmission over the telephone network.
  • a carrier is modulated in the modem according to the data supplied by the computer and sent to a remote station via the telephone network.
  • data can be received by demodulating an incoming modulated carrier and converting it into data signals.
  • Most modems are also equipped with a dialing device, with the aid of which dialing signals are generated from the data supplied by the computer.
  • the modem is controlled from the computer using a suitable program.
  • a device for dialing a number (DE 40 11 393 A1) is also known, with an adaptation circuit for connecting an interface of a personal computer to a telephone line and with a memory-resident program which outputs data representing the number to be dialed to the adaptation circuit and that can be activated by manual input while other programs are running.
  • the adaptation circuit is connected directly to the telephone line.
  • the telephone dialer is not used. Remote control of other functions of the phone is also not possible.
  • the object of the present invention is to bring about a further improvement in the interaction of the telephone network with a personal computer.
  • the operation of a telephone is to be facilitated with a first device according to the invention, for which the least possible technical effort should be required.
  • an existing device for generating dial signals in the telephone is provided with an interface which can be connected to a standard interface of a personal computer, and in the personal computer a program for sending data which at least represents dialing information, can be executed via the standard interface.
  • This device has the advantage that the device available for generating dialing signals in the telephone can be used and thereby generates, for example, the dialing signals (tone or pulse dialing) defined in the respective telephone network.
  • the interface can be adapted to the type of device available in each case for generating dialing signals which are already available as integrated circuits.
  • a further development of the invention consists in that an adaptation device is provided in the telephone between the standard interface and a key matrix. This means that the inputs of the dialing device intended for the keys can also be used.
  • the adaptation device consists of a serial line receiver with a parallel output, a device for electrical isolation and a matrix encoder.
  • the device for generating dialing signals has a serial or parallel interface.
  • An advantageous embodiment of the invention consists in that lines (metallic lines or optical fibers) are provided for the transmission of the data. If the lines are not expedient in individual cases, it can be provided according to another embodiment that the data is transmitted by means of electromagnetic waves. The transmission can take place in different wavebands or with infrared radiation.
  • the data contain coded dialing information. This makes it possible for the number determined or selected with the aid of the personal computer to be transmitted to the dialing device in the shortest possible time, and thus the personal computer can already be used for other tasks while the selection is being carried out.
  • the coding can be selected regardless of the type of dialing method, so that no special adaptation of the program to the dialing method is required.
  • the data can also contain commands for switching a listening device on or off, for seizing the telephone line and / or for switching between tone and pulse dialing.
  • the commands for switching between sound and Pulse dialing may occur multiple times within a sequence of digits to be dialed.
  • a command for tone dialing can be issued, for example, in front of an outside line code and a command for pulse dialing after the outside line code.
  • which commands are inserted can preferably be specified in a configuration program.
  • An improvement of the device according to the invention is that data can also be transmitted from the interface to the standard interface, which represent the respective status of the telephone line (ringing tone, dial tone, busy signal), and that the program responds to that from the interface to the personal computer transmitted data is provided.
  • the status of the telephone line can preferably be displayed on the screen of the personal computer.
  • the lines for transmitting the data between the personal computer and the interface are routed via a subscriber outlet.
  • the object of a second device according to the invention is to enable various services, in particular telephony and data and / or facsimile transmission, over the telephone network with the aid of a personal computer with the least possible technical outlay.
  • This telephone device is characterized by a modem for data and / or facsimile transmission, which generates dialing signals from data supplied by a computer, and a Hearing / speaking device that can be connected to a telephone line together with the modem.
  • This telephone device according to the invention can be implemented with the aid of highly integrated circuits as a handy module that can be plugged onto an interface connector of a personal computer, for example.
  • a telephone device according to the invention can be integrated into a telephone.
  • many operator simplifications are possible when establishing the connection.
  • the advantage of the telephone device according to the invention is particularly clear, for example, in connection with a portable personal computer (laptop).
  • a portable personal computer laptop
  • This enables a traveler to make long-distance calls at any telephone socket using the personal computer, to carry out data and / or facsimile transmission or to participate in the on-screen text service.
  • the laptop computer including the telephone device according to the invention thus becomes a complete office.
  • the telephone device according to the invention can be connected as a module to the laptop computer or integrated into it.
  • Another advantage is that components are largely used for the telephone device according to the invention, which are manufactured in large quantities for data and / or facsimile transmission.
  • a disruption caused by the modem transmitting a carrier when a call is to be made is avoided by means which prevent the modem from transmitting a carrier unless a carrier has been received. It can it should be provided that the means which prevent the modem from sending a carrier are formed by a program for a microprocessor contained in the modem.
  • a release of the telephone line is provided if no carrier suitable for data and / or facsimile transmission is received within a predetermined time. So that a user has enough time to pick up a handset or so that this or a comparable process may not be necessary, means are provided according to a further development which also maintain a line seizure carried out prior to dialing if no data and / or facsimile Transmission of suitable carriers is received.
  • An advantageous embodiment is characterized by the design as an adapter for a parallel interface of a computer. As a result, the manageability of this invention
  • Telephone equipment significantly improved.
  • the same interface can be used for a printer in addition to telephoning and data and / or facsimile transmission.
  • the phone can be used in the usual way.
  • the number can also be dialed from the computer.
  • a telephone equipped in this way can also be used as a modem.
  • the implementation of an answering machine in a telephone device according to the invention is possible by means of accepting calls and for digitally storing voice signals. It can be provided that the stored speech signals can be fed to a device for speech recognition and that output signals of the device for speech recognition can be displayed using the computer.
  • Another device is used to send facsimile messages and is characterized in that an interface for connection to a personal computer is designed in such a way that data can be supplied from the personal computer which are of a type intended for a printer and that means for transformation the data are provided in data suitable for facsimile transmission.
  • the interface is preferably a parallel interface.
  • the advantage of this device is that facsimile messages can be sent with almost any program (for example a word processing program) that can be used to print. No special facsimile program is required for this.
  • This device according to the invention can also be designed as an adapter plug. Another advantage of this device can be seen in the fact that in a network with several personal computers, the otherwise required management software and the otherwise required hardware (fax server) are eliminated. The existing printer management of the network operating program can do all the tasks necessary to send facsimile messages when using the device according to the invention »
  • FIG. 3 shows a flow chart of an exemplary embodiment of a program suitable for the device according to the invention
  • Fig. 6 is a view of a fourth embodiment and Fig. 7 is a block diagram of another embodiment.
  • FIG. 1 shows a block diagram of a device 11 according to the invention, which is connected to a telephone 12 known per se and a personal computer 13. For the sake of clarity, only the parts or functional groups required to understand the invention are shown.
  • the telephone 12 is connected to the exchange lines a1 and b1, to which a dialing device 14 and an amplifier 15 are connected.
  • the amplifier 15 is connected to a speech / listening device and a hands-free device.
  • the speaking / listening device and the hands-free device are only shown schematically as a functional unit 16.
  • the selection device 14 is essentially formed by an integrated circuit which is available, for example, from UMC under the designation UM 91261.
  • the connections R0 to R3 and sO to s3 of the dialing device 14 are used to enter the digits to be dialed or other commands.
  • the keyboard 17 contains the keys 0 to 9, *, # and A to D. If, for example, the key 4 is pressed on the keyboard 17, the line R1 is connected to the line s2, whereupon the selection device 14 generates the respectively defined dialing signals and via the exchange lines a1, b1 to a switching center, not shown. Many of the common dialing devices 14 are able to selectively generate dialing signals using the pulse dialing method or the multi-frequency dialing method.
  • the personal computer 13 is equipped in a manner known per se with a keyboard 18 and a monitor 19 and an interface 20, which in the exemplary embodiment is designed as a serial interface RS 232.
  • a special program designed for remote control of the telephone can be activated in the personal computer 13.
  • a program which is suitable per se will be described in detail later with reference to FIG. 3.
  • the coded dialing information is fed via lines 21 to a serial line receiver 22, which forwards the received data in parallel form to a device 23 for electrical isolation.
  • This facility is required in most telephone networks, especially in the Federal Republic of Germany, for security reasons.
  • a simple possibility for realizing the device 23 is given by optocouplers.
  • a matrix encoder 24 which has two groups of four output connections each, connects to the outputs of the device 23.
  • the output connections of group 25 are connected to connections s0 to s3 and the output connections of group 26 are connected to connections R0 to R3 of selector device 14.
  • one of the output connections of group 25 is connected to one of the output connections of group 26, which corresponds to pressing the corresponding key on keyboard 17.
  • Corresponding coded information which is transmitted from the personal computer 13 can thus be used for the same entries for the selection device 14 as for the keyboard 17. It is therefore possible to operate the selection device or the telephone via the personal computer 13 in exactly the same way as with the keyboard 17. For example - besides that Assigning the telephone line and the dialing process - as with a dedicated key from the personal computer via the standard interface 20, the line 21, the circuit 11, the dialing device 14 and via a line 27, the hands-free device is switched on or off.
  • Fig. 2 shows a screen mask as it is used in conventional programs for managing addresses.
  • Two phone numbers with local area codes are entered in corresponding fields, which mean the telephone number and the fax number of the addressee. If the telephone number is to be dialed with the device according to the invention, the data record shown is made visible on the screen by corresponding entries with the address management program.
  • the program shown in FIG. 3 is activated by actuating a key defined as a "hot key", for example one of the function keys.
  • a hot key for example one of the function keys.
  • both phone numbers are highlighted in the screen image shown in FIG. 2, for example by brightening.
  • the required number is saved and the corresponding dialing process started by moving the cursor and pressing the return key.
  • the search area can be restricted accordingly when configuring the program.
  • a window with operating information appears on the screen at a point not provided with digit sequences, which in this case prompts you to select one of the two highlighted phone numbers.
  • the program is set up to suppress these when searching for phone numbers as well as when dialing.
  • phone numbers are stored in files together with the area code.
  • dialing a subscriber in the same local area network it does not make sense to use the local area code. For this reason, suppression of a specific area code, which is entered when the program is configured, is provided in the device according to the invention.
  • the program also offers the option of editing phone numbers before dialing. This can be used advantageously if an extension is to be dialed, but the corresponding phone number is stored in the file together with another extension number.
  • the program shown in FIG. 3 is a memory-resident program which, in a manner known per se, is loaded into the main memory after switching on the personal computer - during so-called booting - but is not initially executed.
  • a so-called hot key is provided to start the program. This is done continuously - also when working with any user program - a query of the keyboard after entering a predetermined character. This can preferably be selected when installing the program and should be a character that is not required in the other programs, for example "Crtl -".
  • Program routines for loading a memory-resident program and for a suitable keyboard query are known per se to the person skilled in the art, so that an explanation in detail is unnecessary.
  • the video RAM is scanned in the program part 42 for character strings, which call numbers can be.
  • a sequence of digits with a minimum number of digits is preferably recognized as a possible call number. The minimum number can be specified during installation.
  • characters between the numbers such as brackets or dashes, are not taken into account.
  • a branch 49 then takes place depending on whether none or whether one or more sequences of digits have been found.
  • the window generated at 48 is provided with a menu in one of the program parts 50, 51, 52, the result of the check at 47 being taken into account in addition to the number of digit sequences found.
  • the menu generated at 50 prompts the user to enter a number and, in the case of a stored number intended for redial, to make a decision on the redial.
  • the menu 51 provides the user with a choice of whether the stored or the highlighted number should be dialed.
  • Menu 52 prompts the user to select one of the highlighted sequences of digits. This is the case in the example according to FIG. 2. If there is still a number to redial in memory, this is also taken into account in menu 52.
  • the program waits for the corresponding entries.
  • the number sequence is edited at 56 and the program branches at 57. If the stored number is to be dialed, it is read out of the memory at 58 and made available for the subsequent dialing process. Otherwise - if no redial is to take place, the new number at 59 becomes Dialing provided.
  • a command is placed on the standard interface 20, which occupies the telephone line.
  • the dialing signal is then waited for in a loop formed by the two branches 61, 62. As long as it is not yet received, the loop is run through. If no dial tone is still received after the time t has elapsed, the loop is exited at branch 62 and an error message is output at 64.
  • a branch 65 follows the branch 61, which sends data to the telephone which cause the dialing of the number.
  • a further loop is checked to determine whether a call sign or a busy signal arrives within a time of, for example, 10 seconds.
  • two branches 66, 67 and a time-dependent branch 68 are provided. The loop is run through as long as neither a busy signal nor a call sign arrives. The loop is terminated after 10s and the program continues at 64 with an error message.
  • a request is made in program part 75 to pick up the handset. This can be done by outputting a sound and / or by an appropriate screen display. A further loop 76 is then run through until the handset is lifted or until 30 seconds have passed. Then a command "release telephone line" is generated at 77. If the handset is picked up, this command is not carried out by the telephone because the line is seized by picking up the handset. The telephone line is not released until the handset is replaced. The program is then branched at 71 depending on whether the call number is to be stored - for example in the event that the called subscriber does not answer and therefore a redial is to take place. The program is then ended, as already described.
  • a microprocessor 81 is connected via a bus system to a circuit 82 which contains a digital signal processor, line control functions, transmitter and receiver and an interface to the telephone line.
  • Filters 83 which increase the interference immunity of the transmission, are provided in a manner known per se between the wires of the telephone line a and b and the circuit 82.
  • a suitable microprocessor and a circuit 82 are sold, for example, by Rockwell as a component set under the type designation RC9624AC-W.
  • microprocessor 81 Various memories are provided for the microprocessor 81, namely a read-only memory 84 for programs, a read-write memory 85 as working memory and a non-volatile read-write memory 86 for storing variable data, which, however, are retained even in the event of operational interruptions should.
  • the microprocessor 81 is provided with an interface 87, which enables connection to a personal computer, not shown.
  • a hearing / speaking device 88 is connected to the wires a, b of a telephone line with high resistance.
  • This can consist, for example, of an amplifier 89 known per se, a microphone 90 and a receiver 90 ', the amplifier being designed as a hook-up circuit in order to avoid feedback.
  • the circuit 82 In addition to sending and receiving modulated carriers, the circuit 82 also serves to seize the telephone line a, b and to dial what is done in pulse dialing, which is customary in Germany, by pulse-shaped connection of the two wires, and in multi-frequency dialing, by sending corresponding frequencies.
  • a program is stored in the read-only memory 84 and, in addition to the functions required for the data and / or facsimile transmission, also carries out the functions mentioned at the outset for handling long-distance calls.
  • a telephone 91 is connected in the exemplary embodiment according to FIG. 5, the details of which need not be explained in connection with the present invention.
  • a series connection of a capacitor 93 and a resistor 94 is provided in the feed to the telephone. These are dimensioned in such a way that the loop current flowing when the handset is on-hook does not become inadmissibly large, and there is no impairment of the high frequencies of the telephone signals. Via the resistor 94, the capacitor 93 is charged to the direct voltage applied to the wires a and b when the handset is on-hook.
  • the voltage between the wires a, b collapses to a large extent, so that a voltage jump and a negative voltage occurs at the connection point 95 until the capacitor 93 is discharged. This voltage jump is evaluated in a suitable manner by the microprocessor 1.
  • FIG. 6 shows an embodiment of the invention which is advantageous, in particular for use when traveling.
  • the entire electrical circuit is accommodated in a small module 101 which has a plug 102 at one end and a socket 103 at the other end, so that it can be connected to the parallel interface of a personal computer and signal transmission to a printer is still possible if necessary.
  • the device can be connected to a telephone socket via a standardized telephone plug 104.
  • a pair of headphones 105 with a microphone 106 serve as the hearing / speaking device.
  • the device according to FIG. 7 is connected via an input 111 to an interface of a personal computer, preferably to a parallel interface.
  • a microcomputer 110 receives the data and transmitted from the personal computer returns messages to the personal computer - for example, whether it is ready to accept data.
  • the microcomputer 110 is emulated in accordance with a printer.
  • a RISC processor can be used as the microcomputer 110, in which the required functions, including a relatively large memory, are arranged on a chip.
  • An essential task of the microcomputer 110 is to transform the incoming data into picture elements (pixels), which are stored in a page memory 112 until the pixel transformation for, for example, one page has ended.
  • the transformation takes place when ASCII characters are supplied using a character set stored in the microcomputer 110.
  • supplied graphic data can be transformed into individual pixels. If the personal computer already supplies the microcomputer 110 with pixel-by-pixel data, the microcomputer 110 adapts this data to the line width or pixel width provided for the facsimile transmission.
  • suitable control characters are transmitted which inform the microcomputer 110 of the type of data received.
  • the personal computer can transmit the telephone number to be dialed to microcomputer 110 after a control character identifying the telephone number as such.
  • the latter controls a dialing signal generator 113, which converts the incoming data into dialing pulses or dialing tone signals, depending on the telephone standard.
  • These reach the wires a and b of the telephone line via a telephone network interface 114.
  • the telephone network interface 114 further includes a device for recognizing the line status, for example whether a dial tone, a dialing signal or a busy signal is received or whether the line is occupied by a telephone set connected in parallel.
  • This information is sent via line 115 to microcomputer 110, which evaluates it in a suitable manner and, if appropriate, gives messages to the personal computer which can be displayed on the screen - for example "subscriber busy".
  • the data to be sent are read by the microcomputer 110 from the page memory 112 and fed to a so-called fax IC 116.
  • a so-called fax IC 116 Such integrated circuits are available on the market, for example from Toshiba, and contain, among other things, a Huffman encoder and a modulator.
  • a line memory 117, which is required for the Huffman coding, is assigned to the fax IC 116.
  • the output signals of the fax IC 116 are also fed to the telephone network interface 114 and are transmitted from there to the facsimile device of the other subscriber after the dial-up connection has been set up and data has been exchanged during initialization.
  • the page memory can only have the capacity of one page.
  • the microcomputer 110 transmits a stop sign to the personal computer so that it waits to transmit the following page.
  • the page stored in page memory 112 is then transmitted.
  • a new page can be downloaded from the personal computer transferred to the microcomputer 110, transformed there and read into the page memory 112, which is then sent as a second page.
  • the page memory 112 it is also possible within the scope of the invention to select the page memory so large that even the longest facsimile message to be expected can be stored.
  • Another possibility for continuous operation is that the functions of the microcomputer 110 which are required for reading the pixels from the page memory 112 and forwarding them to the fax IC 116 are carried out in a separate circuit and two independent page memories are provided, one of which is written with the transformed data, while the other is used to read the data for the purpose of transmission.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Facsimiles In General (AREA)

Abstract

L'invention concerne un dispositif de télécommunications comprenant un modem de transmission de données et/ou de télécopie qui produit des signaux de numérotation à partir de données fournies par un ordinateur, et un dispositif permettant de parler et d'écouter qui, avec le modem, est relié à une ligne téléphonique. Afin de permettre l'utilisation à distance du téléphone, le dispositif placé dans le téléhone pour générer les signaux de numérotation est pourvu d'une interface qui est reliée à l'interface standard d'un ordinateur personnel. Dans l'ordinateur personnel, est stocké un programme servant à l'émission de données qui représentent au moins les données de numérotation, ledit programme étant exécuté par l'intermédiaire d'une interface standard.
PCT/DE1992/000767 1991-09-10 1992-09-10 Dispositif de telecommunications WO1993005606A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DEP4129949.3 1991-09-10
DE4129949A DE4129949A1 (de) 1991-09-10 1991-09-10 Einrichtung zum fernbedienen eines telefons
DE4206933A DE4206933A1 (de) 1992-03-05 1992-03-05 Fernsprecheinrichtung
DEP4206933.5 1992-03-05

Publications (1)

Publication Number Publication Date
WO1993005606A1 true WO1993005606A1 (fr) 1993-03-18

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Application Number Title Priority Date Filing Date
PCT/DE1992/000767 WO1993005606A1 (fr) 1991-09-10 1992-09-10 Dispositif de telecommunications

Country Status (2)

Country Link
AU (1) AU2542092A (fr)
WO (1) WO1993005606A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647053A1 (fr) * 1993-09-30 1995-04-05 Siemens Aktiengesellschaft Terminal de communication
EP0647054A1 (fr) * 1993-09-30 1995-04-05 Siemens Aktiengesellschaft Dispositif interface entre un terminal téléphonique et un modem
EP0654928A1 (fr) * 1993-11-19 1995-05-24 SDX Business Systems Limited Poste téléphonique
EP0681393A1 (fr) * 1994-05-03 1995-11-08 Deutsche Telekom AG Dispositif de télécommunication
ES2125836A1 (es) * 1996-05-14 1999-03-01 Samsung Electronics Co Ltd Circuito de interfaz de linea telefonica que se utiliza para terminales vocales y no vocales y procedimiento para el control del mismo.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136246A (en) * 1983-02-03 1984-09-12 Sharp Kk Combined telephone and modem
EP0196815A2 (fr) * 1985-03-25 1986-10-08 AT&T Corp. Calculateur personnel avec facilité pour prendre des notes
US4839919A (en) * 1985-08-16 1989-06-13 Borges Marcos V P Telephone and demodulator
US4860342A (en) * 1987-04-09 1989-08-22 Danner David L Computer-telephone interface method and apparatus
US4870677A (en) * 1987-09-04 1989-09-26 Copytele, Inc. Data/facsimile telephone subset apparatus incorporating electrophoretic displays

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2136246A (en) * 1983-02-03 1984-09-12 Sharp Kk Combined telephone and modem
EP0196815A2 (fr) * 1985-03-25 1986-10-08 AT&T Corp. Calculateur personnel avec facilité pour prendre des notes
US4839919A (en) * 1985-08-16 1989-06-13 Borges Marcos V P Telephone and demodulator
US4860342A (en) * 1987-04-09 1989-08-22 Danner David L Computer-telephone interface method and apparatus
US4870677A (en) * 1987-09-04 1989-09-26 Copytele, Inc. Data/facsimile telephone subset apparatus incorporating electrophoretic displays

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647053A1 (fr) * 1993-09-30 1995-04-05 Siemens Aktiengesellschaft Terminal de communication
EP0647054A1 (fr) * 1993-09-30 1995-04-05 Siemens Aktiengesellschaft Dispositif interface entre un terminal téléphonique et un modem
EP0654928A1 (fr) * 1993-11-19 1995-05-24 SDX Business Systems Limited Poste téléphonique
US5696813A (en) * 1993-11-19 1997-12-09 Sdx Business Systems Unlimited Telephone set
EP0681393A1 (fr) * 1994-05-03 1995-11-08 Deutsche Telekom AG Dispositif de télécommunication
ES2125836A1 (es) * 1996-05-14 1999-03-01 Samsung Electronics Co Ltd Circuito de interfaz de linea telefonica que se utiliza para terminales vocales y no vocales y procedimiento para el control del mismo.

Also Published As

Publication number Publication date
AU2542092A (en) 1993-04-05

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