WO1997036411B1 - Smart telecommunications interface - Google Patents

Smart telecommunications interface

Info

Publication number
WO1997036411B1
WO1997036411B1 PCT/US1997/006085 US9706085W WO9736411B1 WO 1997036411 B1 WO1997036411 B1 WO 1997036411B1 US 9706085 W US9706085 W US 9706085W WO 9736411 B1 WO9736411 B1 WO 9736411B1
Authority
WO
WIPO (PCT)
Prior art keywords
contacts
interface
accessory
signal
telecommunications
Prior art date
Application number
PCT/US1997/006085
Other languages
French (fr)
Other versions
WO1997036411A9 (en
WO1997036411A2 (en
WO1997036411A3 (en
Filing date
Publication date
Priority claimed from US08/625,398 external-priority patent/US5892823A/en
Application filed filed Critical
Priority to DK97921160T priority Critical patent/DK0890247T3/en
Priority to DE69730207T priority patent/DE69730207T2/en
Priority to EP97921160A priority patent/EP0890247B1/en
Priority to KR1019980707539A priority patent/KR100275144B1/en
Priority to CA002245171A priority patent/CA2245171C/en
Priority to JP53469797A priority patent/JP3678756B2/en
Publication of WO1997036411A2 publication Critical patent/WO1997036411A2/en
Publication of WO1997036411A9 publication Critical patent/WO1997036411A9/en
Publication of WO1997036411B1 publication Critical patent/WO1997036411B1/en
Publication of WO1997036411A3 publication Critical patent/WO1997036411A3/en

Links

Abstract

The present invention overcomes interface problems between proprietary handset ports on telephone base units and voice/data accessory products by allowing a user to automatically calibrate the telephone accessory product for an optimal interface match with the intended telephone base unit. This is accomplished through the use of a 'Smart Interface Technology' (SIT) integrated chip set consisting of a full custom analog and semi-custom digital integrated circuit. The SIT incorporates three different methods for 'learning' the characteristics of 4-wire port modular interfaces found in all telephone station sets. Basically, these methods determine the approrpriate 4-wire terminal configurations, the transmit and receive channels of the intended telephone base unit, and adjust the channel sensitivities until an optimal and clear signal is provided for the user.

Claims

AMENDED CLAIMS
[received by the International Bureau on 10 April 1998 (10.04.98); original claims 1 and 2 amended; new claim 41 added; remaining claims unchanged (2 pages)]
1. A telecommunications interface system that automatically configures ,α accessory having a predetermined number of electrical acce$sory contacts to appropriately interface with a telephone base unit having a plurality of electr cal contacts, including two electrical output contacts, wherein the interface systei n is configured for coupling the output contacts to a predetermined pair of the ac ;essory contacts, the interface comprising: a. an interface port having the predetermined number of accessory contacts, wherein the port receives an input signal from the output contacts on two of the accessory contacts; b. a signal processing circuit having two signal inputs coupled for receiving the input signal from the interface port; and c. a directing circuit coupled between the interface port and the signal processing circuit for electrically coupling the output contacts to the .- ignal inputs wherem the output contacts are automatically selected from the plurality of electrical contacts according to a sensed signal received from the telephone base.
2. The telecommunications interface system according to ciaim 41 wherein die plurality of electrical contacts further comprises two electrical input contacts wherein the interface system is configured for coupling the input contacts to a predetemiined pair of the accessory contacts, a. the signal processing circuit further comprising two signal outputs coupled for providing an output signal; b. the interface port further comprising mε:ans for receiving the output ; ignal from the signal outputs on two of the accessory contacts; and c. the directing circuit further comprising means for electrically coupling the signal outputs to the input contacts.
- 29 w. a bandgap filter coupled between the sleep and system power supp'y circuit and the controller for providing a stable reference signal to the controller.
34. The telecommunicatioris system according to claim 33 wherein the load is inductive.
35. The telecommunications system according to claim 34 wherein the ind ictive load is a headset.
36. The telecommunications system according to claim 34 wherein the inductive load is a handset.
37. The telecommunications system according to claim 33 wherein the lo∑id is capacitive.
38. The telecor munications system according to claim 33 wherein the load is resistive.
39. The telecommunications system according to claim 33 wherein the accessory is a voice accessory.
40. The telecommunications system according to claim 33 wherein the accessory is a data accessory.
41. The telecommunications interface system according to claim 1 wherέ in the sensed signal is a dial tone signal.
30 -
PCT/US1997/006085 1996-03-27 1997-03-27 Smart telecommunications interface WO1997036411A2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DK97921160T DK0890247T3 (en) 1997-03-27 1997-03-27 Smart interface technology
DE69730207T DE69730207T2 (en) 1996-03-27 1997-03-27 INTELLIGENT TELECOMMUNICATION INTERFACE
EP97921160A EP0890247B1 (en) 1996-03-27 1997-03-27 Smart interface technology
KR1019980707539A KR100275144B1 (en) 1996-03-27 1997-03-27 Smart telecommunication interface
CA002245171A CA2245171C (en) 1996-03-27 1997-03-27 Smart telecommunications interface
JP53469797A JP3678756B2 (en) 1996-03-27 1997-03-27 Telecommunications interface system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/625,398 US5892823A (en) 1996-03-27 1996-03-27 Smart interface technology
US08/625,398 1996-03-27

Publications (4)

Publication Number Publication Date
WO1997036411A2 WO1997036411A2 (en) 1997-10-02
WO1997036411A9 WO1997036411A9 (en) 1997-12-11
WO1997036411B1 true WO1997036411B1 (en) 1998-05-28
WO1997036411A3 WO1997036411A3 (en) 1998-05-28

Family

ID=24505893

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/006085 WO1997036411A2 (en) 1996-03-27 1997-03-27 Smart telecommunications interface

Country Status (8)

Country Link
US (3) US5892823A (en)
EP (1) EP0890247B1 (en)
JP (1) JP3678756B2 (en)
KR (1) KR100275144B1 (en)
CN (1) CN1119005C (en)
CA (1) CA2245171C (en)
DE (1) DE69730207T2 (en)
WO (1) WO1997036411A2 (en)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5892823A (en) * 1996-03-27 1999-04-06 Hello Direct, Inc. Smart interface technology
US5912964A (en) * 1996-03-27 1999-06-15 Hello Direct, Inc. Adaptive telephone handset interface
DK172488B1 (en) * 1996-07-30 1998-10-05 Gn Netcom As Headset interface and methods for adjusting the same
US5729603A (en) * 1996-09-30 1998-03-17 Plantronics, Inc. Self-configuring telephone interface unit
US6128369A (en) * 1997-05-14 2000-10-03 A.T.&T. Corp. Employing customer premises equipment in communications network maintenance
US6108404A (en) * 1998-02-05 2000-08-22 Mci Communications Corporation Method and system for testing a connection in a telephone network using interactive telephone response module
GB9804905D0 (en) * 1998-03-10 1998-04-29 Knowles Electronics Co Telephone interface device
US6026146A (en) * 1998-06-08 2000-02-15 Lucent Technologies Inc. Automated voice terminal protocol identification system
US6084958A (en) * 1998-06-23 2000-07-04 Starium Ltd Determining the manner in which the wires connecting to a base set of a telephone system are used for transmission and reception of electrical signals representing a communication
US6731748B1 (en) * 1998-11-30 2004-05-04 Qualcomm Incorporated Audio interface for satellite user terminals
US6377678B1 (en) 1999-04-01 2002-04-23 Knowles Electronics, Llc Telephone handset emulator
US7197137B1 (en) * 1999-06-14 2007-03-27 Intel Corporation Interface class discovery method and device
US6931121B1 (en) * 1999-07-28 2005-08-16 Intel Corporation Dual personality analog port
US6671371B1 (en) * 1999-08-30 2003-12-30 Plantronics, Inc. Adaptive transmit amplifier
US7633963B1 (en) * 1999-09-22 2009-12-15 Plantronics, Inc. Accessory interface bus for telephone headset adapter
DE60035702T2 (en) * 1999-11-19 2008-04-30 Hello Direct Inc., San Jose METHOD AND DEVICE FOR INTERFACING A TELEPHONE DEVICE AND A DIGITAL, ANALOG OR HYBRID MEDIATION SYSTEM
US6721404B1 (en) 2002-09-12 2004-04-13 Plantronics, Inc. Remotely controlled diagnostic telephone system with modem
US7003085B1 (en) 2002-09-12 2006-02-21 Plantronics, Inc. Customer service process for remotely assisting users of telephone and modem systems
US7167694B2 (en) * 2003-04-14 2007-01-23 Silicon Laboratories Inc. Integrated multi-tuner satellite receiver architecture and associated method
AU2003265205A1 (en) * 2003-08-29 2005-03-16 Infineon Technologies Ag Communication device for connection to an external acoustic transducer
ITPD20070001A1 (en) 2007-01-02 2008-07-03 Stefano Malagodi DEPTH BUOY FOR MARITIME APPLICATIONS AND PROCEDURE FOR ITS REALIZATION
EP2202950B1 (en) 2008-12-23 2015-12-09 GN Netcom A/S Adaptive ringtone detector
ATE532319T1 (en) 2008-12-30 2011-11-15 Gn Netcom As AUTOMATIC SWITCHING AND RANGE CALIBRATION OF A HEADPHONE INTERFACE UNIT
TW201044839A (en) * 2009-06-08 2010-12-16 Askey Computer Corp Network phone
DE102014225876A1 (en) * 2014-12-15 2016-07-28 Ziehl-Abegg Se Input stage for a motor control and motor control, in particular for an electric motor
CN106648521A (en) * 2016-09-27 2017-05-10 北京小米移动软件有限公司 Terminal device operation method and apparatus

Family Cites Families (167)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US35536A (en) * 1862-06-10 Improvement in fanning-mills
US3566271A (en) * 1969-02-18 1971-02-23 Int Communications Corp Automatic equilization for multiple polled stations
US3715513A (en) * 1970-10-29 1973-02-06 Dnd Electronics Pabx-interface interconnection device
US3865995A (en) * 1973-03-14 1975-02-11 Nitsuko Ltd Universal subscriber{3 s line circuit in a key telephone system
NO142768C (en) * 1974-01-26 1980-10-08 Licentia Gmbh CLUTCH FOR AUTOMATIC DYNAMICS COMPRESSION OR EXPANSION
US3892924A (en) * 1974-08-12 1975-07-01 Bell Telephone Labor Inc Active hybrid sidetone producing circuitry for sidetoneless telephone
US3943305A (en) * 1974-11-11 1976-03-09 Magnetic Controls Company Telephone line control system
CA1058340A (en) * 1975-06-30 1979-07-10 International Standard Electric Corporation Two-way loudspeaking device for telephone stations
US4425664A (en) * 1975-11-26 1984-01-10 Bell Telephone Laboratories, Incorporated Multiport programmable digital data set
DE2619192A1 (en) * 1976-04-30 1977-11-17 Licentia Gmbh CIRCUIT FOR AUTOMATIC DYNAMIC COMPRESSION OR EXPANSION
US4055729A (en) * 1976-05-24 1977-10-25 Exxon Research & Engineering Co. Apparatus for the direct connection of ancillary equipment to a telephone network
JPS5816668B2 (en) * 1976-11-12 1983-04-01 富士通株式会社 Facsimile transmission method
US4088844A (en) * 1976-12-21 1978-05-09 Bell Telephone Laboratories, Incorporated Telephone station set interface circuit
GB1583635A (en) * 1977-03-02 1981-01-28 Int Standard Electric Corp Subscriber line or trunk circuit
US4096362A (en) * 1977-06-20 1978-06-20 Bell Telephone Laboratories, Incorporated Automatic cable balancing network
US4142075A (en) * 1977-10-11 1979-02-27 Burr-Brown Research Corporation Interface circuit and method for telephone extension lines
JPS54136253A (en) * 1978-04-14 1979-10-23 Nec Corp Adaptive type electronic hybrid circuit
US4160122A (en) * 1978-05-23 1979-07-03 Jacobson Sava Telephone earphone amplifier
NL7904429A (en) * 1979-06-06 1980-12-09 Philips Nv FLOW DETECTION DEVICE FOR AN AUTOMATIC TELEPHONE CONTROL PANEL.
US4278848A (en) * 1979-08-06 1981-07-14 Bell Telephone Laboratories, Incorporated Automatically adjustable bidirectional-to-unidirectional transmission network
IT1119498B (en) * 1979-11-19 1986-03-10 Cselt Centro Studi Lab Telecom SYSTEM OF EXCHANGE AND DISCLOSURE OF INFORMATION BY MEANS OF THE TELEPHONE NETWORK OF DISTRIBUTION TO THE USER
US4368362A (en) * 1980-07-28 1983-01-11 Bell Telephone Laboratories, Incorporated Automatic telephone loaded/nonloaded facility type identification circuit
US4368361A (en) * 1980-07-28 1983-01-11 Bell Telephone Laboratories, Incorporated Automatically adjustable bidirectional-to-unidirectional transmission network
US4367374A (en) * 1981-02-17 1983-01-04 Novation, Inc. Modem telephone interface circuit
DE3210034A1 (en) 1981-03-23 1982-09-30 AKG Akustische u. Kino-Geräte GmbH, 1150 Wien Ear pad for a headphone earpiece
FR2518854B1 (en) * 1981-12-18 1986-08-08 Thomson Csf Mat Tel TELEPHONE SET WITH SPEECH AMPLIFIERS
US4431871A (en) * 1982-01-21 1984-02-14 Northern Telecom Limited Solid state relay
US4446335A (en) * 1982-01-25 1984-05-01 Dynametric, Inc. Telephone signal recording methods and apparatus
FR2525056A1 (en) * 1982-04-09 1983-10-14 Telephonie Ind Commerciale LINE-OFF PLUG-OUT DEVICE FOR A TELEPHONE STATION COMPRISING A MICROPROCESSOR
JPS58178658A (en) * 1982-04-12 1983-10-19 Mitsubishi Electric Corp Data communicating system
JPS59115633A (en) * 1982-12-22 1984-07-04 Toshiba Corp Information transmitting system
JPS59165540A (en) * 1983-03-09 1984-09-18 Ricoh Co Ltd Control system for data transmission
US4636584A (en) * 1983-10-28 1987-01-13 At&T Bell Laboratories Signaling protocol channel unit
DE3410145A1 (en) * 1984-03-20 1985-10-03 Standard Elektrik Lorenz Ag, 7000 Stuttgart Circuit arrangement for connecting an ancillary device to a telephone line
US4712231A (en) * 1984-04-06 1987-12-08 Shure Brothers, Inc. Teleconference system
US4697282A (en) * 1984-04-18 1987-09-29 Golden Enterprises, Inc. Telephone operator voice storage and retrieval system
US4567332A (en) * 1984-05-03 1986-01-28 Jamison William E Four-wire telephone system with self-test means
US4759059A (en) * 1984-06-01 1988-07-19 Christensen Larry B Analog telephone circuit for digital telephone system
US4815121A (en) * 1984-06-06 1989-03-21 Canon Kabushiki Kaisha Communication apparatus recognizing speech and automatically switching from data to speech transmission
US4588856A (en) * 1984-08-23 1986-05-13 Timex Computer Corporation Automatic line impedance balancing circuit for computer/telephone communications interface
US4696032A (en) * 1985-02-26 1987-09-22 Siemens Corporate Research & Support, Inc. Voice switched gain system
US4677667A (en) * 1985-08-29 1987-06-30 Gte Communication Systems Corporation Subscriber line circuit having improved AC impedance matching
US4932047A (en) * 1985-11-07 1990-06-05 Luma Telecom, Inc. Conversational video phone
CA1261441A (en) * 1986-05-12 1989-09-26 Robert P. Brennan Programmable subscriber set
US5003580A (en) * 1986-09-16 1991-03-26 Standard Telephones And Cables Pty. Ltd. Adapter for interfacing a work station terminal to a key telephone system
EP0264018A1 (en) * 1986-09-30 1988-04-20 Siemens Aktiengesellschaft Method for the control of the amplification in telephone apparatuses with an electronic speech circuit, and device for carrying out this method
JP2750414B2 (en) 1986-12-01 1998-05-13 ブリティシュ・テレコミュニケーションズ・パブリック・リミテッド・カンパニ Bidirectional data transmission method and apparatus, and bidirectional data transmission station
KR900005796B1 (en) * 1986-12-02 1990-08-11 삼성전자 주식회사 Method for controlling the power supply of modem
US4759054A (en) * 1986-12-22 1988-07-19 Protel, Inc. Toll telephone system and method for maintaining or initiating loop current after resuming on-hook condition
US4893331A (en) * 1987-02-24 1990-01-09 Kabushiki Kaisha Toshiba System allowing selective connection of various types of external apparatuses to telephone set
FR2612029B1 (en) * 1987-03-03 1989-05-12 Connan Jean Louis DEVICE FOR REALIZING THE "HANDSFREE" FUNCTION IN A TELEPHONE SET, COMBINING THE GAIN SWITCHING AND ECHO CANCELLATION FUNCTIONS
US4852160A (en) * 1987-03-03 1989-07-25 Kiko Frederick J Channel unit interface circuit
US4782524A (en) * 1987-05-05 1988-11-01 Rockwell International Corporation Telephone headset interface circuit
US4939767A (en) * 1987-05-20 1990-07-03 Sanyo Electric Co., Ltd. System and method for transmitting image data on a telephone network or equivalent
JPS6412649A (en) * 1987-07-06 1989-01-17 Nec Corp Variable gain circuit for loudspeaker telephone set
US4788708A (en) * 1987-11-25 1988-11-29 Tele-Technix, Inc. Universal headset tester
US4825465A (en) * 1987-12-10 1989-04-25 Telecommunication Concepts, Inc. Exclusionary device for coupling plural telephonic devices to a single central office trunk
US4879746A (en) * 1987-12-30 1989-11-07 Plantronics, Inc. Voice communication link interface apparatus
US4993060A (en) * 1988-02-23 1991-02-12 Kelly Gavan E Portable device for use by a news reporter
CA1311286C (en) * 1988-03-10 1992-12-08 David Joseph Robertson Digital key telephone system
US4852153A (en) * 1988-03-18 1989-07-25 Jerry R. Iggulden Single line master telephone with FAX connection
US4856049A (en) * 1988-03-18 1989-08-08 Jerry R. Iggulden Single line compatible fax system
US4914690A (en) * 1988-03-31 1990-04-03 Nicollet Technologies, Inc. Universal PBX interface
JPH01147559U (en) * 1988-03-31 1989-10-12
US4864567A (en) * 1988-05-04 1989-09-05 The United States Of America As Represented By The Secretary Of The Navy High throughput data communication system
US4894860A (en) * 1988-06-07 1990-01-16 Tie/Communications, Inc. Trunk interface circuitry for telephone systems
USD312627S (en) 1988-06-16 1990-12-04 Gutzmer Howard A Modem interface unit
US4907267A (en) * 1988-06-16 1990-03-06 Gutzmer Howard A Modem interface device
EP0351161A3 (en) * 1988-07-12 1991-04-17 Peter Eric Krebs Testing communications systems
JPH0290887A (en) * 1988-09-28 1990-03-30 Toshiba Corp Antisidetone device for key telephone system
KR910009672B1 (en) * 1988-10-14 1991-11-25 삼성전자 주식회사 Apparatus for compensating the output signal level of modem automatically and its method
US5001746A (en) * 1988-10-29 1991-03-19 Shirohato Yakuhin Co., Ltd. Transmission control unit
US4930156A (en) * 1988-11-18 1990-05-29 Norcom Electronics Corporation Telephone receiver transmitter device
US5029203A (en) * 1988-11-30 1991-07-02 Rohm Co., Ltd. Side tone preventive circuit for telephone
US4876712A (en) * 1988-12-09 1989-10-24 Electronics, Inc. Programmable telephone amplifier circuit interface
US4887288A (en) * 1988-12-28 1989-12-12 American Telephone And Telegraph Company Self calibration arrangement for a voice switched speakerphone
US4901346A (en) * 1988-12-28 1990-02-13 American Telephone And Telegraph Co. Computer controlled speakerphone for adapting to a communication line
US5235637A (en) 1989-01-26 1993-08-10 Plantronics, Inc. Voice communication link interface
US4879738A (en) * 1989-02-16 1989-11-07 Northern Telecom Limited Digital telephony card for use in an operator system
US4928306A (en) * 1989-02-28 1990-05-22 International Business Machines Corporation Dynamically configurable telephone
US5070527A (en) * 1989-03-02 1991-12-03 Acs Communications, Inc. Time dependant, variable amplitude threshold output circuit for frequency variant and frequency invarient signal discrimination
DE69030777T2 (en) * 1989-03-03 1998-01-08 Nippon Telegraph & Telephone Network terminal
JP2842607B2 (en) * 1989-03-13 1999-01-06 株式会社日立製作所 Echo canceller, communication device including the same, and signal processing method
US4918726A (en) * 1989-04-10 1990-04-17 Snyder Gary K Line powered universal telephone amplifier
US4951002A (en) * 1989-04-13 1990-08-21 Plantronics, Inc. Battery powered in-line amplifier
US4951312A (en) * 1989-04-27 1990-08-21 Matsushita Electric Works, Ltd. Balanced transmission device
US5206898A (en) * 1989-05-26 1993-04-27 Shirohato Yakuhiin Co., Ltd. Transmission control unit
US5016271A (en) * 1989-05-30 1991-05-14 At&T Bell Laboratories Echo canceler-suppressor speakerphone
ATE141458T1 (en) * 1989-05-31 1996-08-15 Siemens Ag INTERFACE SETUP
US4975949A (en) * 1989-06-15 1990-12-04 Plantronics, Inc. Electronic headset telephone
US5014299A (en) * 1989-07-20 1991-05-07 Christopher Klupt Modem coupler for multi-line key telephone system
US5133007A (en) * 1989-10-26 1992-07-21 Ricoh Company, Ltd. Side tone correction circuit
JPH0817437B2 (en) * 1989-11-29 1996-02-21 シャープ株式会社 Fax machine
US5058155A (en) * 1989-12-01 1991-10-15 Gn Netcom A/S Multipurpose headset amplifier
US5059141A (en) * 1989-12-08 1991-10-22 Scott Xenophon C Modem/telephone handset cord adaptor
US5034978A (en) * 1989-12-15 1991-07-23 Xel Communications, Inc. Universal channel unit switchable between two wire and four wire configurations
US5036536A (en) * 1990-02-20 1991-07-30 Plantronics, Inc. Electret microphone transmitter for use in telephone circuits
DE4008450A1 (en) * 1990-03-16 1991-09-19 Telefonbau & Normalzeit Gmbh CIRCUIT ARRANGEMENT FOR SIGNAL AND INFORMATION CONVERSION BETWEEN ANALOG-OPERATED CONNECTION LINES AND DIGITALLY-OPERATED CONNECTING BODIES IN COMMUNICATION SWITCHING SYSTEMS
DE59003360D1 (en) * 1990-03-27 1993-12-09 Siemens Ag Two-wire to four-wire converter.
EP0448754B1 (en) * 1990-03-27 1993-11-03 Siemens Aktiengesellschaft Two-wire-four-wire converter
US5191606A (en) * 1990-05-08 1993-03-02 Industrial Technology Research Institute Electrical telephone speech network
US5185789A (en) * 1990-05-30 1993-02-09 Plantronics, Inc. Universal telephone handset interface
US5097501A (en) * 1990-06-29 1992-03-17 At&T Bell Laboratories Key telephone interface
US5018184A (en) * 1990-07-03 1991-05-21 At&T Bell Laboratories Automated channel test unit
US5323449A (en) * 1990-08-23 1994-06-21 Nec Corporation Apparatus for communication by telephone set and facsimile set through order wires
US5586181A (en) * 1990-09-04 1996-12-17 Tollgrade Communications, Inc. Metallic channel unit network
US5164982A (en) * 1990-09-27 1992-11-17 Radish Communications Systems, Inc. Telecommunication display system
US5444770A (en) * 1990-09-27 1995-08-22 Radish Communications Systems, Inc. Telephone handset interface for automatic switching between voice and data communications
US5473676A (en) * 1990-09-27 1995-12-05 Radish Communications Systems, Inc. Telephone handset interface for automatic switching between voice and data communications
US5583922A (en) * 1990-09-27 1996-12-10 Radish Communication Systems, Inc. Telecommunication system for automatic switching between voice and visual data communications using forms
US5493609A (en) * 1990-09-27 1996-02-20 Radish Communications Systems, Inc. Telecommunication system for automatic switching between voice and data communications
US5365577A (en) * 1990-09-27 1994-11-15 Radish Communications Systems, Inc. Telecommunication display system
US5073919A (en) * 1990-10-10 1991-12-17 Teradyne, Inc. Automatically testing telephone lines
US5333194A (en) * 1990-10-15 1994-07-26 Glenayre Electronics, Inc. Autoequalizing bidirectional-to-unidirectional hybrid network
US5133006A (en) * 1990-10-31 1992-07-21 Seiscor Technologies Inc. Combination interface circuit for coupling a digital loop carrier telephone system
US5241590A (en) 1990-12-18 1993-08-31 Dialing Devices Inc. Telephone dialing apparatus
US5237605A (en) * 1990-12-24 1993-08-17 At&T Bell Laboratories Adjunct interface apparatus for a telephone set
US5239579A (en) 1991-01-04 1993-08-24 Schuh Peter O Adaptive amplifier circuit
US5170430A (en) * 1991-01-04 1992-12-08 Schuh Peter O Voice-switched handset receive amplifier
US5179586A (en) * 1991-03-13 1993-01-12 Northern Telecom Limited Line interface circuit
KR940002146B1 (en) 1991-05-27 1994-03-18 삼성전자 주식회사 Telephone system
US5210784A (en) 1991-06-28 1993-05-11 Lifeline Systems, Inc. Adaptive speakerphone system
US5265151A (en) * 1991-07-26 1993-11-23 General Datacomm, Inc. Method of improving modem performance by controlling transmitted power of modem, and modem implementing the same
CA2052351C (en) 1991-09-27 2000-05-23 Gordon J. Reesor Telephone handsfree algorithm
SE9103382L (en) 1991-11-15 1993-05-16 Televerket DEVICE FOR CONNECTING ADAPTATION TO THE DIGITAL TELECOMMUNICATIONS
WO1993012622A1 (en) * 1991-12-09 1993-06-24 The Post Office Communications terminal equipment
US5353347A (en) 1992-02-04 1994-10-04 Acs Communications, Inc. Telephone headset amplifier with battery saver, receive line noise reduction, and click-free mute switching
US5305312A (en) 1992-02-07 1994-04-19 At&T Bell Laboratories Apparatus for interfacing analog telephones and digital data terminals to an ISDN line
JP2836341B2 (en) * 1992-02-24 1998-12-14 富士通株式会社 Meeting telephone circuit
US5249218A (en) * 1992-04-06 1993-09-28 Spectrum Information Technologies, Inc. Programmable universal interface system
US5229721A (en) 1992-04-06 1993-07-20 Plantronics, Inc. Micropower amplifier/transducer driver with signal expansion
US5321745A (en) * 1992-05-26 1994-06-14 Vmx, Inc. Adaptive efficient single/dual tone decoder apparatus and method for identifying call-progression signals
US5303308A (en) 1992-07-07 1994-04-12 Gn Netcom A/S Audio frequency signal compressing system
DE69323661T2 (en) * 1992-07-17 1999-07-22 Rolm Systems Method and device for connecting additional devices to a digital telephone
CA2086573C (en) 1992-12-31 1996-04-09 Christopher M. Forrester Automatic sidetone selector
US5471650A (en) 1993-01-07 1995-11-28 Northern Telecom Limited Radio link parameter control in wireless personal communications system
US5400397A (en) 1993-01-20 1995-03-21 Matsushita Electric Industrial Co., Ltd. Private automatic branch exchange
US5557672A (en) * 1993-03-10 1996-09-17 Antec Corporation Channel interface unit
US5357569A (en) 1993-05-03 1994-10-18 Teltrend Inc. Trans-hybrid loss compensator for on hook transmission
US5422950A (en) 1993-05-03 1995-06-06 Teltrend Inc. Remote terminal channel unit for telephone transmission lines
US5623544A (en) 1993-05-17 1997-04-22 Vxi Corporation Telephone headset interface circuit
US5544243A (en) 1993-05-17 1996-08-06 Vxi Corporation Telephone headset interface circuit
US5471523A (en) * 1993-07-14 1995-11-28 Voysys Corporation Telephone call and voice processing system
US5444243A (en) 1993-09-01 1995-08-22 Hitachi, Ltd. Wien filter apparatus with hyperbolic surfaces
US5396551A (en) 1993-09-03 1995-03-07 Unex Corporation Headset amplifier
US5448646A (en) * 1993-11-01 1995-09-05 Unex Corporation Headset interface assembly
US5526419A (en) 1993-12-29 1996-06-11 At&T Corp. Background noise compensation in a telephone set
US5621731A (en) * 1994-02-04 1997-04-15 Omnilink Communications Corporation Private exchange for ISDN
US5555300A (en) * 1994-03-07 1996-09-10 Gutzmer; Howard A. Telephone handset microphone level adjustment
US5533119A (en) 1994-05-31 1996-07-02 Motorola, Inc. Method and apparatus for sidetone optimization
US5495527A (en) 1994-06-10 1996-02-27 Ouixote Corporation Telephone privacy device
US5454036A (en) * 1994-06-15 1995-09-26 Gleeman; Alan N. Attended messaging machine
CA2148384C (en) 1994-06-27 2003-03-18 Charles Clifford Hallock Methods for performing intelligent network services with an isdn network terminator located at a subscriber's premise
US5528685A (en) * 1994-07-08 1996-06-18 At&T Corp. Transformerless hybrid circuit
US5550901A (en) * 1994-08-24 1996-08-27 Coherent Communications Systems Corp. Full-duplex adapter for PBX telephone system
US5455859A (en) * 1994-11-28 1995-10-03 Gutzmer; Howard A. Telephone handset interface for device having audio input
US5671251A (en) 1995-02-28 1997-09-23 Motorola, Inc. Apparatus and method for a data communications device to selectively operate as an analog modem, as a digital modem, and as a terminal adapter
US5577115A (en) * 1995-03-31 1996-11-19 Lucent Technologies Inc. Customer premise equipment interface
US5629926A (en) 1995-03-31 1997-05-13 Lucent Technologies Inc. Customer premise equipment interface
US5687228A (en) 1995-08-30 1997-11-11 Plantronics, Inc. Universal amplified telephone handset
EP0782306A3 (en) 1995-12-27 2002-05-29 Siemens Information and Communication Networks, Inc. Interface for providing call control for a headset attached to a telephone
US5734713A (en) 1996-01-30 1998-03-31 Jabra Corporation Method and system for remote telephone calibration
US5912964A (en) 1996-03-27 1999-06-15 Hello Direct, Inc. Adaptive telephone handset interface
US5892823A (en) * 1996-03-27 1999-04-06 Hello Direct, Inc. Smart interface technology
US5625679A (en) * 1996-04-23 1997-04-29 Gutzmer Enterprises, Ltd. Telephone handset interface for alternating voice-data (AVD) modem
US5729603A (en) 1996-09-30 1998-03-17 Plantronics, Inc. Self-configuring telephone interface unit
US6128384A (en) 1997-12-22 2000-10-03 Vxi Corporation Self configuring telephone headset amplifier

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