WO1995015643A1 - Voice enhancement system and method - Google Patents
Voice enhancement system and method Download PDFInfo
- Publication number
- WO1995015643A1 WO1995015643A1 PCT/US1994/013603 US9413603W WO9515643A1 WO 1995015643 A1 WO1995015643 A1 WO 1995015643A1 US 9413603 W US9413603 W US 9413603W WO 9515643 A1 WO9515643 A1 WO 9515643A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voice
- voice signal
- input
- signal
- output
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/40—Applications of speech amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G5/00—Tone control or bandwidth control in amplifiers
- H03G5/16—Automatic control
- H03G5/18—Automatic control in untuned amplifiers
- H03G5/22—Automatic control in untuned amplifiers having semiconductor devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/002—Applications of echo suppressors or cancellers in telephonic connections
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
RU96114996A RU2142675C1 (en) | 1993-12-02 | 1994-11-28 | Method and device for amplification of voice signal in communication network |
EP95901975A EP0732024A1 (en) | 1993-12-02 | 1994-11-28 | Voice enhancement system and method |
KR1019960702879A KR100268319B1 (en) | 1993-12-02 | 1994-11-28 | Voice enhencement system and method |
PL94314880A PL175383B1 (en) | 1993-12-02 | 1994-11-28 | Voice amplifying system and method |
CA002177266A CA2177266C (en) | 1993-12-02 | 1994-11-28 | Voice enhancement system and method |
BR9408202A BR9408202A (en) | 1993-12-02 | 1994-11-28 | Process for providing voice amplification in a telecommunications network and system for providing amplification to a voice signal in a telecommunications network |
JP7515686A JP3032811B2 (en) | 1993-12-02 | 1994-11-28 | Voice quality enhancement system and method |
AU11018/95A AU690603B2 (en) | 1993-12-02 | 1994-11-28 | Voice enhancement system and method |
FI962305A FI962305A0 (en) | 1993-12-02 | 1996-05-31 | Sound enhancement method and apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/161,120 | 1993-12-02 | ||
US08/161,120 US5471527A (en) | 1993-12-02 | 1993-12-02 | Voice enhancement system and method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995015643A1 true WO1995015643A1 (en) | 1995-06-08 |
Family
ID=22579904
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1994/013603 WO1995015643A1 (en) | 1993-12-02 | 1994-11-28 | Voice enhancement system and method |
Country Status (14)
Country | Link |
---|---|
US (2) | US5471527A (en) |
EP (1) | EP0732024A1 (en) |
JP (1) | JP3032811B2 (en) |
KR (1) | KR100268319B1 (en) |
CN (1) | CN1149373A (en) |
AU (2) | AU690603B2 (en) |
BR (1) | BR9408202A (en) |
CA (1) | CA2177266C (en) |
FI (1) | FI962305A0 (en) |
PL (1) | PL175383B1 (en) |
RU (1) | RU2142675C1 (en) |
TW (1) | TW321763B (en) |
WO (1) | WO1995015643A1 (en) |
ZA (1) | ZA949489B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1997024858A2 (en) * | 1995-12-29 | 1997-07-10 | Dsc Telecom L.P. | Voice enhancement system and method |
Families Citing this family (57)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2300087B (en) * | 1995-04-18 | 1999-04-28 | Ibm | Voice processing system and method |
US5712954A (en) * | 1995-08-23 | 1998-01-27 | Rockwell International Corp. | System and method for monitoring audio power level of agent speech in a telephonic switch |
FI100840B (en) * | 1995-12-12 | 1998-02-27 | Nokia Mobile Phones Ltd | Noise attenuator and method for attenuating background noise from noisy speech and a mobile station |
US5802164A (en) * | 1995-12-22 | 1998-09-01 | At&T Corp | Systems and methods for controlling telephone sound enhancement on a per call basis |
JPH09321833A (en) * | 1996-05-28 | 1997-12-12 | Saitama Nippon Denki Kk | Portable telephone set |
KR100526216B1 (en) * | 1996-11-28 | 2005-11-04 | 브리티쉬 텔리커뮤니케이션즈 파블릭 리미티드 캄퍼니 | Interactive apparatus |
US5995619A (en) * | 1996-12-31 | 1999-11-30 | U.S. Philips Corporation | Telephony device with compensation for line losses |
US6128369A (en) * | 1997-05-14 | 2000-10-03 | A.T.&T. Corp. | Employing customer premises equipment in communications network maintenance |
US5943413A (en) * | 1997-06-09 | 1999-08-24 | At&T Corp. | Method for selectively routing enhanced calls |
FR2765610B1 (en) * | 1997-07-04 | 2003-08-15 | Kiekert Ag | MOTOR VEHICLE WITH A CLOSING SYSTEM TO BE OPENED OR LOCKED BY REMOTE CONTROL |
GB2330961B (en) * | 1997-11-04 | 2002-04-24 | Nokia Mobile Phones Ltd | Automatic Gain Control |
WO1999037038A1 (en) * | 1998-01-15 | 1999-07-22 | Siemens Schweiz Ag | Method for setting up echo suppression devices in communication links with automatic machines |
JP4045003B2 (en) * | 1998-02-16 | 2008-02-13 | 富士通株式会社 | Expansion station and its system |
US6351529B1 (en) * | 1998-04-27 | 2002-02-26 | 3Com Corporation | Method and system for automatic gain control with adaptive table lookup |
US6188763B1 (en) | 1998-05-29 | 2001-02-13 | Westell Technologies, Inc. | Signal processing unit for network interface unit |
US6263074B1 (en) * | 1998-06-19 | 2001-07-17 | Lucent Technologies, Inc. | User programmable station set bass and treble control |
US7181297B1 (en) | 1999-09-28 | 2007-02-20 | Sound Id | System and method for delivering customized audio data |
US6545562B2 (en) * | 2001-02-09 | 2003-04-08 | Adc Telecommunications, Inc. | Plug connector for cable television network and method of use |
US6944474B2 (en) * | 2001-09-20 | 2005-09-13 | Sound Id | Sound enhancement for mobile phones and other products producing personalized audio for users |
US20030168235A1 (en) * | 2002-03-07 | 2003-09-11 | Todd Loeffelholz | EMI shielded module |
US20030230921A1 (en) * | 2002-05-10 | 2003-12-18 | George Gifeisman | Back support and a device provided therewith |
US7155385B2 (en) * | 2002-05-16 | 2006-12-26 | Comerica Bank, As Administrative Agent | Automatic gain control for adjusting gain during non-speech portions |
US6759005B2 (en) * | 2002-07-23 | 2004-07-06 | Heraeus, Inc. | Fabrication of B/C/N/O/Si doped sputtering targets |
US20040105219A1 (en) * | 2002-12-03 | 2004-06-03 | Mcclellan Terry E. | Chassis for housing telecommunications components |
US8249861B2 (en) * | 2005-04-20 | 2012-08-21 | Qnx Software Systems Limited | High frequency compression integration |
US8086451B2 (en) | 2005-04-20 | 2011-12-27 | Qnx Software Systems Co. | System for improving speech intelligibility through high frequency compression |
US7472041B2 (en) | 2005-08-26 | 2008-12-30 | Step Communications Corporation | Method and apparatus for accommodating device and/or signal mismatch in a sensor array |
US7619563B2 (en) | 2005-08-26 | 2009-11-17 | Step Communications Corporation | Beam former using phase difference enhancement |
US20070050441A1 (en) * | 2005-08-26 | 2007-03-01 | Step Communications Corporation,A Nevada Corporati | Method and apparatus for improving noise discrimination using attenuation factor |
US7415372B2 (en) * | 2005-08-26 | 2008-08-19 | Step Communications Corporation | Method and apparatus for improving noise discrimination in multiple sensor pairs |
US20070047742A1 (en) * | 2005-08-26 | 2007-03-01 | Step Communications Corporation, A Nevada Corporation | Method and system for enhancing regional sensitivity noise discrimination |
US7436188B2 (en) * | 2005-08-26 | 2008-10-14 | Step Communications Corporation | System and method for improving time domain processed sensor signals |
US20070047743A1 (en) * | 2005-08-26 | 2007-03-01 | Step Communications Corporation, A Nevada Corporation | Method and apparatus for improving noise discrimination using enhanced phase difference value |
US7864717B2 (en) * | 2006-01-09 | 2011-01-04 | Flextronics Automotive Inc. | Modem for communicating data over a voice channel of a communications system |
BRPI0807703B1 (en) | 2007-02-26 | 2020-09-24 | Dolby Laboratories Licensing Corporation | METHOD FOR IMPROVING SPEECH IN ENTERTAINMENT AUDIO AND COMPUTER-READABLE NON-TRANSITIONAL MEDIA |
US20090010453A1 (en) * | 2007-07-02 | 2009-01-08 | Motorola, Inc. | Intelligent gradient noise reduction system |
US8374851B2 (en) * | 2007-07-30 | 2013-02-12 | Texas Instruments Incorporated | Voice activity detector and method |
CN102017402B (en) | 2007-12-21 | 2015-01-07 | Dts有限责任公司 | System for adjusting perceived loudness of audio signals |
CN101360351B (en) * | 2008-06-03 | 2012-01-18 | 无锡友达电子有限公司 | Low pass integrated circuit fulfilling mute function by twin span cascade |
KR20100024659A (en) * | 2008-08-26 | 2010-03-08 | 주식회사 팬택 | Method and apparatus for controlling audio out, and mobile terminal system applied thereof |
CN101741965B (en) * | 2008-11-27 | 2012-10-03 | 博通集成电路(上海)有限公司 | Method for attenuating input signal and noise suppressing device |
CN101789797A (en) * | 2009-01-22 | 2010-07-28 | 浙江安迪信信息技术有限公司 | Wireless communication anti-interference system |
CN101859568B (en) * | 2009-04-10 | 2012-05-30 | 比亚迪股份有限公司 | Method and device for eliminating voice background noise |
US8538042B2 (en) | 2009-08-11 | 2013-09-17 | Dts Llc | System for increasing perceived loudness of speakers |
US8204742B2 (en) | 2009-09-14 | 2012-06-19 | Srs Labs, Inc. | System for processing an audio signal to enhance speech intelligibility |
US8284042B2 (en) * | 2009-09-28 | 2012-10-09 | Ford Global Technologies, Llc | System and method of vehicle passenger detection for rear seating rows |
GB2476043B (en) * | 2009-12-08 | 2016-10-26 | Skype | Decoding speech signals |
PL2737479T3 (en) | 2011-07-29 | 2017-07-31 | Dts Llc | Adaptive voice intelligibility enhancement |
US9312829B2 (en) | 2012-04-12 | 2016-04-12 | Dts Llc | System for adjusting loudness of audio signals in real time |
US9031838B1 (en) * | 2013-07-15 | 2015-05-12 | Vail Systems, Inc. | Method and apparatus for voice clarity and speech intelligibility detection and correction |
US8977376B1 (en) | 2014-01-06 | 2015-03-10 | Alpine Electronics of Silicon Valley, Inc. | Reproducing audio signals with a haptic apparatus on acoustic headphones and their calibration and measurement |
US8767996B1 (en) | 2014-01-06 | 2014-07-01 | Alpine Electronics of Silicon Valley, Inc. | Methods and devices for reproducing audio signals with a haptic apparatus on acoustic headphones |
US10986454B2 (en) | 2014-01-06 | 2021-04-20 | Alpine Electronics of Silicon Valley, Inc. | Sound normalization and frequency remapping using haptic feedback |
KR102270628B1 (en) | 2015-02-09 | 2021-06-30 | 엘지전자 주식회사 | Refrigerator |
US9691413B2 (en) * | 2015-10-06 | 2017-06-27 | Microsoft Technology Licensing, Llc | Identifying sound from a source of interest based on multiple audio feeds |
EA038803B1 (en) * | 2017-12-25 | 2021-10-21 | Федеральное государственное унитарное предприятие "Всероссийский научно-исследовательский институт автоматики им. Н.Л. Духова" | Method for the adaptive digital filtering of impulse noise and filter for the implementation thereof |
RU2702258C1 (en) * | 2018-06-26 | 2019-10-07 | Общество с ограниченной ответственностью "РВ-СИСТЕМС" (ООО "РВ-СИСТЕМС") | Orthogonal frequency multiplexing method and its implementing device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5280473A (en) * | 1990-02-08 | 1994-01-18 | Universal Data Systems, Inc. | Modem with echo cancellation |
US5280525A (en) * | 1991-09-27 | 1994-01-18 | At&T Bell Laboratories | Adaptive frequency dependent compensation for telecommunications channels |
US5317596A (en) * | 1992-12-01 | 1994-05-31 | The Board Of Trustees Of The Leland Stanford, Junior University | Method and apparatus for echo cancellation with discrete multitone modulation |
US5351291A (en) * | 1991-09-06 | 1994-09-27 | International Business Machines Corporation | Adaptive echo cancellation method and device for implementing said method |
Family Cites Families (294)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL16990C (en) * | 1923-04-30 | |||
USRE19305E (en) * | 1929-07-17 | 1934-09-04 | Negative impedance repeater | |
US1844424A (en) * | 1930-11-04 | 1932-02-09 | Bell Telephone Labor Inc | Long distance telephone transmission |
US1968460A (en) * | 1932-12-29 | 1934-07-31 | Bell Telephone Labor Inc | Noise suppression circuit |
US2045300A (en) * | 1934-05-31 | 1936-06-23 | Rca Corp | Radio receiving system |
BE415500A (en) * | 1935-05-16 | |||
US2151091A (en) * | 1935-10-30 | 1939-03-21 | Bell Telephone Labor Inc | Signal transmission |
US2167011A (en) * | 1936-01-13 | 1939-07-25 | Philips Nv | Receiving circuit |
US2102138A (en) * | 1936-02-21 | 1937-12-14 | Bell Telephone Labor Inc | Transmission system |
US2098350A (en) * | 1936-07-02 | 1937-11-09 | American Telephone & Telegraph | Control of signaling circuits |
US2144565A (en) * | 1936-11-30 | 1939-01-17 | Magnavox Company Inc | Volume control for electrical sound reproducer |
US2134059A (en) * | 1937-03-15 | 1938-10-25 | Rca Corp | Loudspeaker circuits |
US2173426A (en) * | 1937-08-30 | 1939-09-19 | Gen Radio Co | Electric system |
US2154579A (en) * | 1937-11-20 | 1939-04-18 | American Telephone & Telegraph | Telephone conference circuit |
US2190318A (en) * | 1938-04-21 | 1940-02-13 | Rca Corp | Damping system |
US2170941A (en) * | 1938-09-15 | 1939-08-29 | Bell Telephone Labor Inc | Transmission control in signaling systems |
US2209667A (en) * | 1939-05-13 | 1940-07-30 | Bell Telephone Labor Inc | Control of transmission in two-way signaling systems |
US2206146A (en) * | 1939-05-27 | 1940-07-02 | Bell Telephone Labor Inc | Control of transmission and two-way signaling systems |
NL70924C (en) * | 1939-10-04 | |||
US2248746A (en) * | 1940-03-22 | 1941-07-08 | Bell Telephone Labor Inc | Signal wave transmission system |
US2282465A (en) * | 1941-02-27 | 1942-05-12 | Bell Telephone Labor Inc | Speech transmission system |
US2300415A (en) * | 1941-04-26 | 1942-11-03 | Bell Telephone Labor Inc | Transmission control |
US2350951A (en) * | 1941-10-31 | 1944-06-06 | Bell Telephone Labor Inc | Electric wave system |
US2607860A (en) * | 1944-07-12 | 1952-08-19 | Punch Engineering Pty Ltd | Frequency selective repeater device |
BE420493A (en) * | 1946-01-17 | |||
US2606969A (en) * | 1946-01-17 | 1952-08-12 | Myron T Smith | Method and system for reducing noise in the transmission of electric signals |
US2606970A (en) * | 1946-01-19 | 1952-08-12 | Myron T Smith | Method of and system for reducing noise in the transmission of signals |
US2606971A (en) * | 1946-01-19 | 1952-08-12 | Myron T Smith | Method and system for reducing noise in the transmission of electric signals |
US2513360A (en) * | 1947-01-09 | 1950-07-04 | Nielsen A C Co | System for determining the listening habits of wave signal receiver users |
US2732436A (en) * | 1947-12-22 | 1956-01-24 | Frequency in cycles per second | |
US2710314A (en) * | 1950-06-08 | 1955-06-07 | Tongue Ben Hapgood | Wide-band amplifying system |
BE507449A (en) * | 1950-11-30 | |||
BE505815A (en) * | 1950-12-27 | |||
BE511541A (en) * | 1951-05-21 | |||
US2766374A (en) * | 1951-07-25 | 1956-10-09 | Internat Telementer Corp | System and apparatus for determining popularity ratings of different transmitted programs |
US2680232A (en) * | 1951-09-13 | 1954-06-01 | Revere Camera Co | Compensated tone and volume control system |
US2759049A (en) * | 1951-12-04 | 1956-08-14 | Hermon H Scott | Method and system for reducing noise in the transmission of electric signals |
US2781417A (en) * | 1953-08-07 | 1957-02-12 | George G Bower | Telephone transmission system |
US2812498A (en) * | 1953-09-23 | 1957-11-05 | Cecil T Hall | Aural attenuators |
US2900609A (en) * | 1954-07-27 | 1959-08-18 | Vm Corp | Tone compensated loudness control |
US2908761A (en) * | 1954-10-20 | 1959-10-13 | Bell Telephone Labor Inc | Voice pitch determination |
GB839975A (en) * | 1955-07-28 | 1960-06-29 | Telephone Mfg Co Ltd | Improvements in and relating to signal switched telecommunication circuits |
US2948778A (en) * | 1956-05-07 | 1960-08-09 | Warner W Clements | Sound reproducing means |
US3045074A (en) * | 1958-06-25 | 1962-07-17 | Gylling & Co Ab | Amplifier for transmission of speech in two directions |
FR1215805A (en) * | 1958-11-18 | 1960-04-20 | Cie Ind Des Telephones | Improvements to voice-frequency amplifiers |
US3114005A (en) * | 1959-04-24 | 1963-12-10 | Lenkurt Electric Co Inc | Inband signaling system |
US3083265A (en) * | 1960-02-01 | 1963-03-26 | Itt | Conference call circuit |
US3183313A (en) * | 1960-12-16 | 1965-05-11 | Bell Telephone Labor Inc | Echo suppressor operable by a pilot tone |
US3102928A (en) * | 1960-12-23 | 1963-09-03 | Bell Telephone Labor Inc | Vocoder excitation generator |
US3083266A (en) * | 1961-02-28 | 1963-03-26 | Bell Telephone Labor Inc | Vocoder apparatus |
FR1313232A (en) * | 1961-11-14 | 1962-12-28 | Continuously Variable Level Controller for Powerline Telephone Systems | |
BE630382A (en) * | 1962-03-30 | |||
US3145269A (en) * | 1962-05-16 | 1964-08-18 | Bell Telephone Labor Inc | Control of dynamic range and sensitivity of echo suppressor circuits |
US3290442A (en) * | 1962-07-11 | 1966-12-06 | Tdk Electronics Co Ltd | Noise responsive automatic sound volume controlling system |
US3313885A (en) * | 1963-05-21 | 1967-04-11 | William R Aiken | Combined tone control and volume expander arrangement |
NL298464A (en) * | 1963-06-21 | |||
US3281723A (en) * | 1964-02-03 | 1966-10-25 | Fairchild Recording Equipment | Dynamic equalizer circuits having a light dependent cell for producing a relatively constant apparent loudness effect |
DE1250496B (en) * | 1964-02-12 | |||
US3360748A (en) * | 1964-04-20 | 1967-12-26 | Automatic Elect Lab | Double threshold gain regulator for communication systems |
US3339027A (en) * | 1964-10-07 | 1967-08-29 | Bell Telephone Labor Inc | Telephone line range extension circuitry |
NL154378B (en) * | 1965-01-08 | 1977-08-15 | Frederik Adolf Nauta En Freder | SYSTEM AND DEVICE FOR RECORDING LISTENING AND / OR VIEWING DATA. |
US3361520A (en) * | 1965-02-19 | 1968-01-02 | Garrett Res & Dev Co | Process for the preparation of anhydrous aluminum chloride |
US3403228A (en) * | 1965-03-09 | 1968-09-24 | Bell Telephone Labor Inc | Telephone party-line isolation and range extension |
US3452282A (en) * | 1965-05-03 | 1969-06-24 | Philco Ford Corp | Auto radio volume and tone control circuit |
US3449518A (en) * | 1965-09-15 | 1969-06-10 | Louis W Erath | Sound reproduction compensation system |
US3428748A (en) * | 1965-12-28 | 1969-02-18 | Bell Telephone Labor Inc | Vowel detector |
US3436488A (en) * | 1966-03-17 | 1969-04-01 | Bell Telephone Labor Inc | Line circuit for a key telephone system utilizing a single multifunction supervisory relay |
US3465104A (en) * | 1966-09-09 | 1969-09-02 | Bell Telephone Labor Inc | Step-by-step telephone system with range extension |
US3493686A (en) * | 1966-09-15 | 1970-02-03 | Bell Telephone Labor Inc | Telephone switching system serving long customer loops and short customer loops |
US3497622A (en) * | 1966-10-21 | 1970-02-24 | Zenith Radio Corp | Automatic gain control |
US3509500A (en) * | 1966-12-05 | 1970-04-28 | Avco Corp | Automatic digital tuning apparatus |
US3530244A (en) * | 1967-02-13 | 1970-09-22 | Martin G Reiffin | Motional feedback amplifier systems |
US3483336A (en) * | 1967-04-03 | 1969-12-09 | Lear Siegler Inc | Disabling device for the alternating-current path of a two-wire transmission syste |
US3496465A (en) * | 1967-05-19 | 1970-02-17 | Bell Telephone Labor Inc | Fundamental frequency detector |
US3497621A (en) * | 1967-06-19 | 1970-02-24 | Louis W Erath | Audio reproduction system with low frequency compensation |
US3508009A (en) * | 1967-09-06 | 1970-04-21 | Bell Telephone Labor Inc | Range extension circuit |
US3684838A (en) * | 1968-06-26 | 1972-08-15 | Kahn Res Lab | Single channel audio signal transmission system |
US3571529A (en) * | 1968-09-09 | 1971-03-16 | Zenith Radio Corp | Hearing aid with frequency-selective agc |
US3617636A (en) * | 1968-09-24 | 1971-11-02 | Nippon Electric Co | Pitch detection apparatus |
US3573402A (en) * | 1969-03-25 | 1971-04-06 | Lorain Prod Corp | Bidirectional additive amplifier |
NL139150B (en) * | 1969-05-06 | 1973-06-15 | Nederlanden Staat | BIPOLAR TRANSFER. |
US3937887A (en) | 1969-05-15 | 1976-02-10 | Ben O. Key | Acoustic power system |
US3821473A (en) | 1969-06-20 | 1974-06-28 | J Mullins | Sound reproduction system with driven and undriven speakers and motional feedback |
US3665345A (en) * | 1969-07-21 | 1972-05-23 | Dolby Laboratories Inc | Compressors and expanders for noise reduction systems |
US3660609A (en) * | 1969-08-22 | 1972-05-02 | Communications Systems Corp | Subscriber long line extender |
US3624302A (en) * | 1969-10-29 | 1971-11-30 | Bell Telephone Labor Inc | Speech analysis and synthesis by the use of the linear prediction of a speech wave |
US3649766A (en) * | 1969-12-01 | 1972-03-14 | Bell Telephone Labor Inc | Digital speech detection system |
US3671676A (en) * | 1969-12-17 | 1972-06-20 | Bell Telephone Labor Inc | Subscriber loop range extender |
US3689704A (en) * | 1969-12-17 | 1972-09-05 | Itt | Constant current output controlled repeater insertion |
US3605042A (en) * | 1969-12-22 | 1971-09-14 | Gen Electric | Treble control circuit |
US3911370A (en) | 1970-07-22 | 1975-10-07 | Jerry B Pace | Audio frequency amplitude compensator |
US3696298A (en) * | 1970-07-27 | 1972-10-03 | Kahn Res Lab | Audio signal transmission system and method |
US3689700A (en) * | 1970-09-21 | 1972-09-05 | Lear Siegler Inc | Subscriber loop extension unit |
JPS4946485B1 (en) | 1970-09-30 | 1974-12-10 | ||
US3678416A (en) * | 1971-07-26 | 1972-07-18 | Richard S Burwen | Dynamic noise filter having means for varying cutoff point |
US3699271A (en) * | 1970-11-16 | 1972-10-17 | Bell Telephone Labor Inc | Speech processor using multiband controlled center clipping |
US3689711A (en) * | 1971-01-27 | 1972-09-05 | Bell Telephone Labor Inc | Call diverter repeater |
US3694765A (en) | 1971-02-08 | 1972-09-26 | Bell Telephone Labor Inc | Signal coupling circuit |
JPS5640403B1 (en) | 1971-02-10 | 1981-09-21 | ||
GB1390341A (en) | 1971-03-12 | 1975-04-09 | Dolby Laboratories Inc | Signal compressors and expanders |
US3693155A (en) * | 1971-03-23 | 1972-09-19 | Nat Telecommunications System | Communication system |
US3803359A (en) | 1971-06-08 | 1974-04-09 | Mc Intosh Labor Inc | Equalization system for power amplifier and loudspeaker system |
US3706862A (en) * | 1971-06-28 | 1972-12-19 | Lorain Prod Corp | Amplifier circuit for transmission lines |
US3803357A (en) | 1971-06-30 | 1974-04-09 | J Sacks | Noise filter |
US3740476A (en) * | 1971-07-09 | 1973-06-19 | Bell Telephone Labor Inc | Speech signal pitch detector using prediction error data |
US3911371A (en) | 1971-07-24 | 1975-10-07 | Sony Corp | Signal transmission system |
SE348087B (en) | 1971-09-20 | 1972-08-21 | Ericsson Telefon Ab L M | |
US3781481A (en) | 1971-09-30 | 1973-12-25 | Stromberg Carlson Corp | Amplifier select and control circuit |
US3760108A (en) * | 1971-09-30 | 1973-09-18 | Tetrachord Corp | Speech diagnostic and therapeutic apparatus including means for measuring the speech intensity and fundamental frequency |
US3914560A (en) | 1971-10-13 | 1975-10-21 | Superior Continental Corp | Self-adjusting repeater for voice frequency telephone transmission systems |
FR2157143A5 (en) | 1971-10-19 | 1973-06-01 | Queffeulou Jean Yves | |
BE793458A (en) | 1971-12-30 | 1973-06-28 | Philips Nv | AUTOMATIC EQUALIZATION DEVICE |
US3753786A (en) * | 1972-03-29 | 1973-08-21 | Gould Inc | Method and apparatus for adjusting battery electrolyte concentration |
US3900708A (en) | 1972-03-31 | 1975-08-19 | Siemens Ag | Selective echo suppressor |
US3798374A (en) | 1972-04-03 | 1974-03-19 | Rene Oliveras | Sound reproducing system utilizing motional feedback |
US3932712A (en) | 1972-06-14 | 1976-01-13 | Stromberg-Carlson Corporation | Telephone transmission system |
US3890465A (en) | 1972-07-11 | 1975-06-17 | Victor Company Of Japan | Circuit arrangement for protection of a speaker system |
GB1434239A (en) | 1972-08-10 | 1976-05-05 | Siemens Ag | Echo cancellers |
US3889060A (en) | 1972-09-11 | 1975-06-10 | Matsushita Electric Ind Co Ltd | Feedback amplifier distortion-cancelling circuit |
US3806658A (en) | 1972-10-30 | 1974-04-23 | Bell Telephone Labor Inc | Common controlled equalization system |
US3816668A (en) | 1972-11-15 | 1974-06-11 | Bell Telephone Labor Inc | Arrangement for providing switched range extension |
FR2206889A5 (en) | 1972-11-16 | 1974-06-07 | Rhone Poulenc Sa | |
US3916105A (en) | 1972-12-04 | 1975-10-28 | Ibm | Pitch peak detection using linear prediction |
US3784756A (en) | 1972-12-15 | 1974-01-08 | Bell Telephone Labor Inc | Subscriber loop range extender |
US3819866A (en) | 1972-12-18 | 1974-06-25 | Bell Telephone Labor Inc | Light coupled loop current detector |
US3873775A (en) | 1973-01-25 | 1975-03-25 | Int Standard Electric Corp | Method and an arrangement to indicate deterioration of PCM transmission quality |
US3818151A (en) | 1973-01-26 | 1974-06-18 | Lorain Prod Corp | Method and apparatus for amplifying signal transmission through transmission lines |
US3828281A (en) | 1973-02-26 | 1974-08-06 | Lorain Prod Corp | Impedance simulating circuit for transmission lines |
US3934085A (en) | 1973-03-28 | 1976-01-20 | Television Research Limited | Audio amplifier systems |
US3855431A (en) | 1973-04-02 | 1974-12-17 | Itt | Electronic hybrid amplifier |
US3989896A (en) | 1973-05-08 | 1976-11-02 | Westinghouse Electric Corporation | Method and apparatus for speech identification |
US3906491A (en) | 1973-05-14 | 1975-09-16 | Federal Sign And Signal Corp | Electronic alarm and emergency voice communication system |
US3846856A (en) | 1973-05-22 | 1974-11-12 | Ying Tu Hsiu | Soft mat |
JPS5750097B2 (en) | 1973-06-06 | 1982-10-26 | ||
US3879583A (en) | 1973-08-17 | 1975-04-22 | K Son Corp | Reconstruction of telephone dial signals |
US3946170A (en) | 1973-11-29 | 1976-03-23 | Brooks Fred A | Self regulating telephone sets |
US3941948A (en) * | 1973-11-29 | 1976-03-02 | Brooks Fred A | Four-wire interface regulator for long distance trunk circuits |
JPS5086915A (en) | 1973-11-30 | 1975-07-12 | ||
US3872266A (en) | 1973-12-13 | 1975-03-18 | Magnetic Controls Co | Telephone monitor circuit |
US3911415A (en) | 1973-12-18 | 1975-10-07 | Westinghouse Electric Corp | Distribution network power line carrier communication system |
US3921168A (en) | 1974-01-18 | 1975-11-18 | Damon Corp | Remote sensing and control system |
US3925708A (en) | 1974-03-25 | 1975-12-09 | Andrew V Picciochi | Safety means for audio speakers |
US3903378A (en) | 1974-03-27 | 1975-09-02 | Gte Automatic Electric Lab Inc | Arrangement for controlling the gain of two-way amplifiers in accordance with loop lengths |
US3903366A (en) | 1974-04-23 | 1975-09-02 | Us Navy | Application of simultaneous voice/unvoice excitation in a channel vocoder |
CA1019485A (en) * | 1974-06-21 | 1977-10-18 | Sed Systems Ltd. | Automatic dialing equipment |
US3979557A (en) | 1974-07-03 | 1976-09-07 | International Telephone And Telegraph Corporation | Speech processor system for pitch period extraction using prediction filters |
CH581878A5 (en) | 1974-07-22 | 1976-11-15 | Gretag Ag | |
JPS5325767B2 (en) | 1974-09-05 | 1978-07-28 | ||
US4017695A (en) | 1974-09-30 | 1977-04-12 | Bell Telephone Laboratories, Incorporated | Customer operated gain control circuit |
US3918003A (en) | 1974-10-29 | 1975-11-04 | Bell Telephone Labor Inc | Combined feedback and feedforward automatic gain control |
DE2451912C3 (en) | 1974-10-31 | 1980-02-07 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Circuit arrangement for equalizing the attenuation curve of a low-frequency cable |
US3973087A (en) | 1974-12-05 | 1976-08-03 | General Electric Company | Signal repeater for power line access data system |
US3973240A (en) | 1974-12-05 | 1976-08-03 | General Electric Company | Power line access data system |
US3944723A (en) | 1974-12-05 | 1976-03-16 | General Electric Company | Station for power line access data system |
US4206450A (en) | 1974-12-26 | 1980-06-03 | Bowmar Instrument Corporation | Fire and intrusion security system |
US3967264A (en) | 1975-01-31 | 1976-06-29 | Westinghouse Electric Corporation | Distribution network power line communication system including addressable interrogation and response repeater |
US3942168A (en) | 1975-01-31 | 1976-03-02 | Westinghouse Electric Corporation | Distribution network power line communication system |
US4004096A (en) | 1975-02-18 | 1977-01-18 | The United States Of America As Represented By The Secretary Of The Army | Process for extracting pitch information |
US4007340A (en) | 1975-02-25 | 1977-02-08 | Edison Control Corporation | Distance-related variable gain amplifier |
US4061883A (en) | 1975-03-20 | 1977-12-06 | Lorain Products Corporation | Repeater for transmission lines of differing lengths |
GB1542264A (en) | 1975-04-24 | 1979-03-14 | Acoustic Res Int | Loudspeaker systems |
US4064507A (en) | 1975-05-29 | 1977-12-20 | Westinghouse Electric Corporation | Noise generator circuit for a security system |
US3997724A (en) | 1975-06-03 | 1976-12-14 | American Trading And Production Corporation | Loudspeaker drive mechanism monitoring assembly |
US3959735A (en) | 1975-06-16 | 1976-05-25 | Gte Sylvania Incorporated | Loudspeaker and amplifier protection circuit |
US4074069A (en) | 1975-06-18 | 1978-02-14 | Nippon Telegraph & Telephone Public Corporation | Method and apparatus for judging voiced and unvoiced conditions of speech signal |
US4058676A (en) | 1975-07-07 | 1977-11-15 | International Communication Sciences | Speech analysis and synthesis system |
US4004102A (en) | 1975-08-08 | 1977-01-18 | Bell Telephone Laboratories, Incorporated | Automatic impedance modification of transmission lines |
US3991370A (en) | 1975-10-03 | 1976-11-09 | John Pate | Peak limiter |
US4217661A (en) | 1975-10-14 | 1980-08-12 | Kahn Leonard R | Audio signal transmission system and method incorporating automatic frequency correction |
US4087654A (en) | 1975-11-28 | 1978-05-02 | Bell Telephone Laboratories, Incorporated | Echo canceller for two-wire full duplex data transmission |
US4067008A (en) | 1975-12-29 | 1978-01-03 | Denver Fire Reporter & Protective Co., Inc. | Multiplex interrogation system using pulses |
US4046960A (en) | 1975-12-31 | 1977-09-06 | Veale John R | Audio fidelity frequency equalizer system |
JPS52125251A (en) | 1976-02-23 | 1977-10-20 | Bio Communication Res | Electric filter and method of designing same |
US4051331A (en) | 1976-03-29 | 1977-09-27 | Brigham Young University | Speech coding hearing aid system utilizing formant frequency transformation |
US4061874A (en) | 1976-06-03 | 1977-12-06 | Fricke J P | System for reproducing sound information |
US4027259A (en) | 1976-06-14 | 1977-05-31 | Gte Automatic Electric Laboratories Incorporated | Line equalizer with differentially controlled complementary constant resistance networks |
US4049928A (en) | 1976-06-30 | 1977-09-20 | Northern Telecom Limited | Self-adjusting voice frequency repeater |
US4141006A (en) | 1976-07-14 | 1979-02-20 | Braxton Kenneth J | Security system for centralized monitoring and selective reporting of remote alarm conditions |
US4135590A (en) | 1976-07-26 | 1979-01-23 | Gaulder Clifford F | Noise suppressor system |
US4074087A (en) * | 1976-08-16 | 1978-02-14 | Bell Telephone Laboratories, Incorporated | Bidirectional voice frequency repeater |
US4028496A (en) | 1976-08-17 | 1977-06-07 | Bell Telephone Laboratories, Incorporated | Digital speech detector |
US4143325A (en) | 1976-08-20 | 1979-03-06 | Kahn Leonard R | Constant amplitude interference squelch system |
JPS583601B2 (en) | 1976-09-27 | 1983-01-22 | 株式会社日立製作所 | speaker protection circuit |
US4072830A (en) | 1976-10-04 | 1978-02-07 | Bell Telephone Laboratories, Incorporated | Variable phase shifter for adaptive echo cancellers |
US4076959A (en) | 1976-10-08 | 1978-02-28 | General Motors Corporation | Volume, tone and balance control for multi-channel audio systems |
US4056688A (en) | 1976-11-11 | 1977-11-01 | Bell Telephone Laboratories, Incorporated | Telephone range extender with gain |
US4092493A (en) | 1976-11-30 | 1978-05-30 | Bell Telephone Laboratories, Incorporated | Speech recognition system |
US4107460A (en) | 1976-12-06 | 1978-08-15 | Threshold Technology, Inc. | Apparatus for recognizing words from among continuous speech |
US4054941A (en) | 1976-12-22 | 1977-10-18 | Bell Telephone Laboratories, Incorporated | Range extender with gain |
FR2377734A1 (en) | 1977-01-17 | 1978-08-11 | Trt Telecom Radio Electr | DIGITAL ECHO CANCELER FOR MODEM FOR DATA TRANSMISSION BY MODULATION OF A CARRIER |
US4123711A (en) | 1977-01-24 | 1978-10-31 | Canadian Patents And Development Limited | Synchronized compressor and expander voice processing system for radio telephone |
JPS5394160A (en) | 1977-01-28 | 1978-08-17 | Pioneer Electronic Corp | Muutuning circuit |
US4100543A (en) | 1977-02-04 | 1978-07-11 | Napco Security Systems, Inc. | Audible alarm apparatus particularly adaptable for use with fire and theft security systems |
US4178472A (en) | 1977-02-21 | 1979-12-11 | Hiroyasu Funakubo | Voiced instruction identification system |
JPS53105303A (en) | 1977-02-25 | 1978-09-13 | Hitachi Ltd | Preprocessing system for audio recognition |
JPS53117363A (en) | 1977-03-24 | 1978-10-13 | Toshiba Corp | Modulator |
CA1112385A (en) | 1977-04-13 | 1981-11-10 | Bloomfield J. Warman | Compensation of transmission losses in a telephone system |
US4167653A (en) | 1977-04-15 | 1979-09-11 | Nippon Electric Company, Ltd. | Adaptive speech signal detector |
US4210901A (en) | 1977-04-25 | 1980-07-01 | Westinghouse Electric Corp. | Signal repeater for a distribution network communication system |
US4156868A (en) | 1977-05-05 | 1979-05-29 | Bell Telephone Laboratories, Incorporated | Syntactic word recognizer |
FR2404969A1 (en) | 1977-10-03 | 1979-04-27 | Cit Alcatel | ECHO HALF-SUPPRESSOR FOR A FOUR-WIRE TELEPHONE LINE |
US4177356A (en) | 1977-10-20 | 1979-12-04 | Dbx Inc. | Signal enhancement system |
JPS6050092B2 (en) | 1977-11-08 | 1985-11-06 | ケイディディ株式会社 | Adaptive control echo rejection device |
US4132863A (en) | 1977-12-20 | 1979-01-02 | Bell Telephone Laboratories, Incorporated | Automatic gain and return loss compensating line circuit |
US4301329A (en) | 1978-01-09 | 1981-11-17 | Nippon Electric Co., Ltd. | Speech analysis and synthesis apparatus |
US4182930A (en) | 1978-03-10 | 1980-01-08 | Dbx Inc. | Detection and monitoring device |
DE2817156A1 (en) | 1978-04-17 | 1979-10-25 | Deutsche Bundespost | Echo suppressor for long-distance telephone connections - uses computer to calculate compensation echo signals and adder forming residual echo |
US4164626A (en) | 1978-05-05 | 1979-08-14 | Motorola, Inc. | Pitch detector and method thereof |
US4186273A (en) | 1978-06-05 | 1980-01-29 | Bose Corporation | Stereophonic system having power amplifiers and speakers in a bridge circuit with capacitor connecting junction of speakers to common terminal |
US4197429A (en) | 1978-07-17 | 1980-04-08 | Bell Telephone Laboratories, Incorporated | Gain-adjusting conference circuit |
US4207543A (en) | 1978-07-18 | 1980-06-10 | Izakson Ilya S | Adaptive filter network |
DE2833518A1 (en) | 1978-07-31 | 1980-02-21 | Siemens Ag | Adaptive echo compensator for asynchronous CW system - has frequency corrector containing two multipliers, Hilbert transformer, adder and voltage controlled oscillator |
US4230905A (en) | 1978-08-18 | 1980-10-28 | Crum Ronald J | Stereophonic system with discrete bass channels |
IT1115559B (en) | 1978-08-29 | 1986-02-03 | Cselt Centro Studi Lab Telecom | PROCEDURE AND DEVICE FOR THE NUMERICAL CANCELLATION OF THE ECHO |
US4220817A (en) | 1978-09-15 | 1980-09-02 | Apt Corporation | Audio playback systems |
US4277655A (en) | 1978-10-16 | 1981-07-07 | Lear Siegler, Inc. | Automatic gain repeater |
US4229734A (en) | 1978-10-26 | 1980-10-21 | Honeywell Inc. | Line supervision |
US4250489A (en) | 1978-10-31 | 1981-02-10 | Westinghouse Electric Corp. | Distribution network communication system having branch connected repeaters |
US4330686A (en) | 1978-12-21 | 1982-05-18 | Stephen Roe | Loudspeaker systems |
US4296278A (en) | 1979-01-05 | 1981-10-20 | Altec Corporation | Loudspeaker overload protection circuit |
CH644974A5 (en) | 1979-02-09 | 1984-08-31 | Blaupunkt Werke Gmbh | CIRCUIT ARRANGEMENT FOR AUTOMATICALLY ADJUSTING THE VOLUME AT LEAST ONE SPEAKER TO A NOISE LEVEL FOR RADIO RECEIVERS IN THE SPEAKER LOCATION. |
US4351983A (en) | 1979-03-05 | 1982-09-28 | International Business Machines Corp. | Speech detector with variable threshold |
US4268727A (en) | 1979-03-14 | 1981-05-19 | International Telephone And Telegraph Corporation | Adaptive digital echo cancellation circuit |
US4327250A (en) | 1979-05-03 | 1982-04-27 | Electro Audio Dynamics Inc. | Dynamic speaker equalizer |
FR2462070A1 (en) | 1979-07-17 | 1981-02-06 | Cit Alcatel | DEVICE FOR SUPPLYING A SUBSCRIBER STATION |
US4274155A (en) | 1979-08-06 | 1981-06-16 | Gte Automatic Electric Laboratories Inc. | Multiport conference circuit with multi-frame summing and voice level coding |
JPS5636546U (en) | 1979-08-31 | 1981-04-08 | ||
US4304968A (en) * | 1979-09-24 | 1981-12-08 | Klausner Industries | Telephone electronic answering device |
US4301330A (en) | 1979-09-28 | 1981-11-17 | Zenith Radio Corporation | Loudspeaker protection circuit |
US4315107A (en) | 1979-10-15 | 1982-02-09 | Bell Telephone Laboratories, Incorporated | Telephone range extender with gain |
US4281218A (en) | 1979-10-26 | 1981-07-28 | Bell Telephone Laboratories, Incorporated | Speech-nonspeech detector-classifier |
US4288871A (en) | 1979-11-05 | 1981-09-08 | Bell Telephone Laboratories, Incorporated | Digital loop conferencing signal correction arrangement |
US4300231A (en) | 1979-12-31 | 1981-11-10 | Bell Telephone Laboratories, Incorporated | Digital system error correction arrangement |
US4277645A (en) | 1980-01-25 | 1981-07-07 | Bell Telephone Laboratories, Incorporated | Multiple variable threshold speech detector |
US4331842A (en) | 1980-02-11 | 1982-05-25 | Reliance Electric Company | Voice frequency repeater and term sets and other circuits therefor |
JPS56132804A (en) | 1980-03-22 | 1981-10-17 | Sharp Corp | Operational tone quality control circuit |
US4352962A (en) | 1980-06-27 | 1982-10-05 | Reliance Electric Company | Tone responsive disabling circuit |
US4354160A (en) | 1980-07-01 | 1982-10-12 | Kentrox Industries, Inc. | Amplitude equalizer |
US4342985A (en) | 1980-10-03 | 1982-08-03 | Firecom, Inc. | Remote sensing and control system |
US4457014A (en) | 1980-10-03 | 1984-06-26 | Metme Communications | Signal transfer and system utilizing transmission lines |
CA1180141A (en) | 1980-11-15 | 1984-12-27 | Kenzo Takahashi | Echo canceller system |
US4592068A (en) | 1980-12-23 | 1986-05-27 | International Standard Electric Corporation | Repeater for a digital transmission system |
DE3120639C2 (en) | 1981-05-23 | 1986-10-23 | ANT Nachrichtentechnik GmbH, 7150 Backnang | Arrangement for adaptive cancellation of speaker echoes |
JPS583430A (en) | 1981-06-30 | 1983-01-10 | Nec Corp | Suppressing device of detouring signal |
US4464545A (en) | 1981-07-13 | 1984-08-07 | Bell Telephone Laboratories, Incorporated | Echo canceller |
US4536888A (en) | 1981-08-21 | 1985-08-20 | Plantronics, Inc. | Voice communication instrument system with line-powered receiver conditioning circuit |
FR2512300A1 (en) | 1981-08-25 | 1983-03-04 | Lignes Telegraph Telephon | Bidirectional digital data transmission system - uses switching circuit at subscriber equipment to connect variable attenuator controlled from peak power detector memory |
EP0076233B1 (en) | 1981-09-24 | 1985-09-11 | GRETAG Aktiengesellschaft | Method and apparatus for redundancy-reducing digital speech processing |
SE8205841L (en) | 1981-10-23 | 1983-04-24 | Western Electric Co | echo canceller |
SE8205839L (en) | 1981-10-23 | 1983-04-24 | Western Electric Co | echo canceller |
SE8205840L (en) | 1981-10-23 | 1983-04-24 | Western Electric Co | echo canceller |
GB2111354B (en) | 1981-11-19 | 1985-06-19 | Standard Telephones Cables Ltd | Echo canceller |
US4468804A (en) | 1982-02-26 | 1984-08-28 | Signatron, Inc. | Speech enhancement techniques |
US4490843A (en) | 1982-06-14 | 1984-12-25 | Bose Corporation | Dynamic equalizing |
US4644108A (en) | 1982-10-27 | 1987-02-17 | International Business Machines Corporation | Adaptive sub-band echo suppressor |
US4506237A (en) | 1982-11-30 | 1985-03-19 | Rockwell International Corporation | Adjustable slope equalizer |
US4628156A (en) | 1982-12-27 | 1986-12-09 | International Business Machines Corporation | Canceller trained echo suppressor |
US5034984A (en) | 1983-02-14 | 1991-07-23 | Bose Corporation | Speed-controlled amplifying |
US4652703A (en) | 1983-03-01 | 1987-03-24 | Racal Data Communications Inc. | Digital voice transmission having improved echo suppression |
DE3308321A1 (en) | 1983-03-09 | 1984-09-13 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Method and circuit arrangement for correcting linear attenuation distortion in transmission channels of telecommunications exchanges |
US4542265A (en) | 1983-05-20 | 1985-09-17 | Gte Lenkurt Incorporated | Echo canceller dynamic range extension |
US4535445A (en) | 1983-06-16 | 1985-08-13 | At&T Information Systems | Conferencing system adaptive signal conditioner |
JPS605634A (en) | 1983-06-24 | 1985-01-12 | Nec Corp | Echo canceller |
LU85402A1 (en) | 1983-12-01 | 1984-09-11 | Siemens Ag | METHOD AND CIRCUIT ARRANGEMENT FOR COMPENSATING CROSS-SPEED AND O. ECHO SIGNALS |
US4747132A (en) | 1984-04-09 | 1988-05-24 | Matsushita Electric Industrial Co., Ltd. | Howling canceller |
US4609787A (en) | 1984-05-21 | 1986-09-02 | Communications Satellite Corporation | Echo canceller with extended frequency range |
US4628157A (en) | 1984-09-07 | 1986-12-09 | At&T Bell Laboratories | Bidirectional adaptive voice frequency repeater |
GB8423017D0 (en) | 1984-09-12 | 1984-10-17 | Plessey Co Plc | Echo canceller |
US4731834A (en) | 1984-10-01 | 1988-03-15 | American Telephone And Telegraph Company, At&T Bell Laboratories | Adaptive filter including signal path compensation |
US4682358A (en) | 1984-12-04 | 1987-07-21 | American Telephone And Telegraph Company | Echo canceller |
US4665383A (en) | 1985-04-22 | 1987-05-12 | Firecom, Inc. | Security system with monitoring and warning circuits |
IT1184949B (en) | 1985-05-14 | 1987-10-28 | Sip | IMPROVEMENT OF BIDIRECTIONAL NUMERIC TRANSMISSION SYSTEMS WITH D ECHO CANCELLATION |
US4809338A (en) | 1985-07-05 | 1989-02-28 | Harman International Industries, Incorporated | Automotive sound system |
US4638298A (en) | 1985-07-16 | 1987-01-20 | Telautograph Corporation | Communication system having message repeating terminals |
US4879748A (en) | 1985-08-28 | 1989-11-07 | American Telephone And Telegraph Company | Parallel processing pitch detector |
JPH0746788B2 (en) | 1985-11-05 | 1995-05-17 | 日本電気株式会社 | Automatic track equalizer |
US4882749A (en) | 1986-01-09 | 1989-11-21 | Harris Semiconductor (Patents) Inc. | Control of signal transmission |
US4853581A (en) | 1986-02-10 | 1989-08-01 | Photo Redux Corp. | Radiation-emitting devices |
FR2597690B1 (en) | 1986-04-22 | 1988-06-10 | Trt Telecom Radio Electr | APPARATUS FOR DETECTION AND DISCRIMINATION OF PHASE JUMPS IN A PERIODIC SIGNAL AND APPLICATION TO A TELEPHONE TONE SIGNAL WITH PHASE INVERSIONS. |
NL8601712A (en) | 1986-07-01 | 1988-02-01 | Koninkl Philips Electronics Nv | COMMUNICATION NETWORK, IN PARTICULAR A TELEPHONE NETWORK AND DATA COMMUNICATION NETWORK COMPOSED OF A COLLECTION OF BUTTON UNITS, WHICH FOLLOWS SPECIFIC FACILITIES UNDER DUTIES. |
DE3629596A1 (en) | 1986-08-30 | 1988-03-03 | Standard Elektrik Lorenz Ag | CIRCUIT ARRANGEMENT FOR DECOUPLING THE TRANSFER BRANCHES OF A HANDS-FREE UNIT |
US4894820A (en) * | 1987-03-24 | 1990-01-16 | Oki Electric Industry Co., Ltd. | Double-talk detection in an echo canceller |
IT1211194B (en) | 1987-07-10 | 1989-10-12 | Olivetti & Co Spa | AUTOMATIC DISTORTION MEASUREMENT AND COMPENSATION SYSTEM OF A CONNECTION BETWEEN A TELEPHONE AND A CENTRAL VOICE TREATMENT UNIT |
DE3728109C1 (en) | 1987-08-22 | 1989-03-16 | Telefonbau & Normalzeit Gmbh | Method for voice-controlled attenuation control in telephone transmission circuits |
US4879746A (en) | 1987-12-30 | 1989-11-07 | Plantronics, Inc. | Voice communication link interface apparatus |
CA1315356C (en) * | 1988-07-20 | 1993-03-30 | Seiji Miyoshi | Digital adaptive filter and method of convergence therein |
US4969144A (en) | 1989-01-03 | 1990-11-06 | Universal Data Systems, Inc. | Adaptive passband echo canceller |
JP3085676B2 (en) | 1989-10-30 | 2000-09-11 | 株式会社東芝 | Telephone equipment |
NL9001016A (en) | 1990-04-27 | 1991-11-18 | Philips Nv | DIGITAL ECHO COMPENSATOR WITH A DOUBLE-VOICE DETECTOR. |
JP3158414B2 (en) | 1990-06-25 | 2001-04-23 | 日本電気株式会社 | Echo canceller |
US5195132B1 (en) | 1990-12-03 | 1996-03-19 | At & T Bell Lab | Telephone network speech signal enhancement |
US5206902A (en) | 1991-04-01 | 1993-04-27 | At&T Bell Laboratories | Network signaling arrangement for controlling tandem network functions |
US5388185A (en) | 1991-09-30 | 1995-02-07 | U S West Advanced Technologies, Inc. | System for adaptive processing of telephone voice signals |
US5351031A (en) * | 1993-02-16 | 1994-09-27 | The Grass Valley Group, Inc. | Non-linear slew rate limiter |
-
1993
- 1993-12-02 US US08/161,120 patent/US5471527A/en not_active Expired - Lifetime
-
1994
- 1994-11-28 RU RU96114996A patent/RU2142675C1/en active
- 1994-11-28 JP JP7515686A patent/JP3032811B2/en not_active Expired - Fee Related
- 1994-11-28 WO PCT/US1994/013603 patent/WO1995015643A1/en not_active Application Discontinuation
- 1994-11-28 PL PL94314880A patent/PL175383B1/en unknown
- 1994-11-28 BR BR9408202A patent/BR9408202A/en not_active Application Discontinuation
- 1994-11-28 AU AU11018/95A patent/AU690603B2/en not_active Ceased
- 1994-11-28 CA CA002177266A patent/CA2177266C/en not_active Expired - Fee Related
- 1994-11-28 EP EP95901975A patent/EP0732024A1/en not_active Withdrawn
- 1994-11-28 CN CN94194948A patent/CN1149373A/en active Pending
- 1994-11-28 KR KR1019960702879A patent/KR100268319B1/en not_active IP Right Cessation
- 1994-11-29 ZA ZA949489A patent/ZA949489B/en unknown
- 1994-12-08 TW TW083111446A patent/TW321763B/zh active
-
1995
- 1995-06-07 US US08/484,677 patent/US5592545A/en not_active Expired - Fee Related
-
1996
- 1996-05-31 FI FI962305A patent/FI962305A0/en not_active Application Discontinuation
-
1998
- 1998-05-08 AU AU64822/98A patent/AU6482298A/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5280473A (en) * | 1990-02-08 | 1994-01-18 | Universal Data Systems, Inc. | Modem with echo cancellation |
US5351291A (en) * | 1991-09-06 | 1994-09-27 | International Business Machines Corporation | Adaptive echo cancellation method and device for implementing said method |
US5280525A (en) * | 1991-09-27 | 1994-01-18 | At&T Bell Laboratories | Adaptive frequency dependent compensation for telecommunications channels |
US5317596A (en) * | 1992-12-01 | 1994-05-31 | The Board Of Trustees Of The Leland Stanford, Junior University | Method and apparatus for echo cancellation with discrete multitone modulation |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5896449A (en) * | 1993-12-02 | 1999-04-20 | Alcatel Usa Sourcing L.P. | Voice enhancement system and method |
WO1997024858A2 (en) * | 1995-12-29 | 1997-07-10 | Dsc Telecom L.P. | Voice enhancement system and method |
WO1997024858A3 (en) * | 1995-12-29 | 1997-09-12 | Dsc Telecom Lp | Voice enhancement system and method |
Also Published As
Publication number | Publication date |
---|---|
AU6482298A (en) | 1998-07-02 |
CA2177266C (en) | 2000-02-01 |
FI962305A (en) | 1996-05-31 |
CN1149373A (en) | 1997-05-07 |
TW321763B (en) | 1997-12-01 |
US5592545A (en) | 1997-01-07 |
RU2142675C1 (en) | 1999-12-10 |
AU1101895A (en) | 1995-06-19 |
KR960706738A (en) | 1996-12-09 |
KR100268319B1 (en) | 2000-10-16 |
BR9408202A (en) | 1997-08-26 |
EP0732024A1 (en) | 1996-09-18 |
CA2177266A1 (en) | 1995-06-08 |
AU690603B2 (en) | 1998-04-30 |
PL314880A1 (en) | 1996-09-30 |
ZA949489B (en) | 1995-08-14 |
PL175383B1 (en) | 1998-12-31 |
JPH09506220A (en) | 1997-06-17 |
US5471527A (en) | 1995-11-28 |
FI962305A0 (en) | 1996-05-31 |
JP3032811B2 (en) | 2000-04-17 |
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