NL16990C
(ja)
*
|
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
|
NL44236C
(ja)
*
|
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
|
BE475750A
(ja)
*
|
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
|
US2606969A
(en)
*
|
1946-01-17 |
1952-08-12 |
Myron T Smith |
Method and system for reducing noise in the transmission of electric signals
|
BE420493A
(ja)
*
|
1946-01-17 |
|
|
|
US2606971A
(en)
*
|
1946-01-19 |
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
|
US2513360A
(en)
*
|
1947-01-09 |
1950-07-04 |
Nielsen A C Co |
System for determining the listening habits of wave signal receiver users
|
BE485032A
(ja)
*
|
1947-12-22 |
|
|
|
US2710314A
(en)
*
|
1950-06-08 |
1955-06-07 |
Tongue Ben Hapgood |
Wide-band amplifying system
|
BE507449A
(ja)
*
|
1950-11-30 |
|
|
|
NL82970C
(ja)
*
|
1950-12-27 |
|
|
|
BE511541A
(ja)
*
|
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
(fr)
*
|
1958-11-18 |
1960-04-20 |
Cie Ind Des Telephones |
Perfectionnements aux amplificateurs à fréquence vocale
|
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
(fr)
*
|
1961-11-14 |
1962-12-28 |
|
Régulateur de niveau à variation d'affaiblissement continue pour systèmes téléphoniques à courants porteurs
|
BE630382A
(ja)
*
|
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
|
NL294443A
(ja)
*
|
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
(ja)
*
|
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
(nl)
*
|
1965-01-08 |
1977-08-15 |
Frederik Adolf Nauta En Freder |
Stelsel en inrichting voor het registreren van luister- en/of kijkgegevens.
|
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
(nl)
*
|
1969-05-06 |
1973-06-15 |
Nederlanden Staat |
Bipolaire overdrager.
|
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
|
US3689704A
(en)
*
|
1969-12-17 |
1972-09-05 |
Itt |
Constant current output controlled repeater insertion
|
US3671676A
(en)
*
|
1969-12-17 |
1972-06-20 |
Bell Telephone Labor Inc |
Subscriber loop range extender
|
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
(ja)
|
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
|
US3868584A
(en)
|
1971-02-08 |
1975-02-25 |
Henry Richard Beurrier |
Amplifier with input and output match
|
JPS5640403B1
(ja)
|
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
(ja)
|
1971-09-20 |
1972-08-21 |
Ericsson Telefon Ab L M |
|
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
|
US3781481A
(en)
|
1971-09-30 |
1973-12-25 |
Stromberg Carlson Corp |
Amplifier select and control circuit
|
US3914560A
(en)
|
1971-10-13 |
1975-10-21 |
Superior Continental Corp |
Self-adjusting repeater for voice frequency telephone transmission systems
|
FR2157143A5
(ja)
|
1971-10-19 |
1973-06-01 |
Queffeulou Jean Yves |
|
BE793458A
(fr)
|
1971-12-30 |
1973-06-28 |
Philips Nv |
Dispositif d'egalisation automatique
|
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
|
FR2199241B1
(ja)
|
1972-09-11 |
1978-11-10 |
Matsushita Electric Ind Co Ltd |
|
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
(ja)
|
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
(ja)
|
1973-06-06 |
1982-10-26 |
|
|
US3879583A
(en)
|
1973-08-17 |
1975-04-22 |
K Son Corp |
Reconstruction of telephone dial signals
|
US3941948A
(en)
*
|
1973-11-29 |
1976-03-02 |
Brooks Fred A |
Four-wire interface regulator for long distance trunk circuits
|
US3946170A
(en)
|
1973-11-29 |
1976-03-23 |
Brooks Fred A |
Self regulating telephone sets
|
JPS5086915A
(ja)
|
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
(ja)
|
1974-07-22 |
1976-11-15 |
Gretag Ag |
|
JPS5325767B2
(ja)
|
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
(de)
|
1974-10-31 |
1980-02-07 |
Siemens Ag, 1000 Berlin Und 8000 Muenchen |
Schaltungsanordnung zur Entzerrung des Dämpfungsverlaufs eines Niederfrequenzkabels
|
US3944723A
(en)
|
1974-12-05 |
1976-03-16 |
General Electric Company |
Station for power line access data system
|
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
|
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
(ja)
|
1976-09-27 |
1983-01-22 |
株式会社日立製作所 |
スピ−カ保護回路
|
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
(fr)
|
1977-01-17 |
1978-08-11 |
Trt Telecom Radio Electr |
Annuleur d'echo numerique pour modem de transmission de donnees par modulation d'une porteuse
|
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
(fr)
|
1977-10-03 |
1979-04-27 |
Cit Alcatel |
Demi-suppresseur d'echo pour une ligne telephonique a quatre fils
|
US4177356A
(en)
|
1977-10-20 |
1979-12-04 |
Dbx Inc. |
Signal enhancement system
|
JPS6050092B2
(ja)
|
1977-11-08 |
1985-11-06 |
ケイディディ株式会社 |
適応制御型反響阻止装置
|
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
(de)
|
1978-04-17 |
1979-10-25 |
Deutsche Bundespost |
Echokompensator fuer fernsprech-weitverkehrs-verbindungen
|
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
(de)
|
1978-07-31 |
1980-02-21 |
Siemens Ag |
Schaltungsanordnung zur kompensation von echos
|
US4230905A
(en)
|
1978-08-18 |
1980-10-28 |
Crum Ronald J |
Stereophonic system with discrete bass channels
|
IT1115559B
(it)
|
1978-08-29 |
1986-02-03 |
Cselt Centro Studi Lab Telecom |
Procedimento e dispositivo per la cancellazione numerica dell eco
|
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
(de)
|
1979-02-09 |
1984-08-31 |
Blaupunkt Werke Gmbh |
Schaltungsanordnung zum selbsttaetigen anpassen der lautstaerke mindestens eines lautsprechers an einen am lautsprecherort herrschenden stoergeraeuschpegel fuer rundfunkempfaenger.
|
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
(fr)
|
1979-07-17 |
1981-02-06 |
Cit Alcatel |
Dispositif d'alimentation d'un poste d'abonne
|
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
(ja)
|
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
(de)
|
1981-05-23 |
1986-10-23 |
ANT Nachrichtentechnik GmbH, 7150 Backnang |
Anordnung zur adaptiven Löschung von Sprecherechos
|
JPS583430A
(ja)
|
1981-06-30 |
1983-01-10 |
Nec Corp |
まわり込信号抑圧装置
|
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
(fr)
|
1981-08-25 |
1983-03-04 |
Lignes Telegraph Telephon |
Systeme de transmission numerique a l'alternat a niveaux optimises
|
ATE15563T1
(de)
|
1981-09-24 |
1985-09-15 |
Gretag Ag |
Verfahren und vorrichtung zur redundanzvermindernden digitalen sprachverarbeitung.
|
SE8205841L
(sv)
|
1981-10-23 |
1983-04-24 |
Western Electric Co |
Ekoeliminator
|
SE8205839L
(sv)
|
1981-10-23 |
1983-04-24 |
Western Electric Co |
Ekoeliminator
|
SE8205840L
(sv)
|
1981-10-23 |
1983-04-24 |
Western Electric Co |
Ekoeliminator
|
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
(de)
|
1983-03-09 |
1984-09-13 |
Standard Elektrik Lorenz Ag, 7000 Stuttgart |
Verfahren und schaltungsanordnung zum korrigieren von linearen daempfungsverzerrungen in uebertragungskanaelen von fernmelde-vermittlungsstellen
|
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
(ja)
|
1983-06-24 |
1985-01-12 |
Nec Corp |
エコ−キヤンセラ
|
LU85402A1
(de)
|
1983-12-01 |
1984-09-11 |
Siemens Ag |
Verfahren und schaltungsanordnung zur kompensation von uebersprech-u./o.echosignalen
|
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
(it)
|
1985-05-14 |
1987-10-28 |
Sip |
Perfezionamento ai sistemi per la trasmissione numerica bidirezionale con cancellazione d eco
|
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
(ja)
|
1985-11-05 |
1995-05-17 |
日本電気株式会社 |
自動線路等化器
|
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
(fr)
|
1986-04-22 |
1988-06-10 |
Trt Telecom Radio Electr |
Appareil de detection et de discrimination de sauts de phase dans un signal periodique et application a un signal telephonique de tonalite avec inversions de phase.
|
NL8601712A
(nl)
|
1986-07-01 |
1988-02-01 |
Koninkl Philips Electronics Nv |
Communicatienetwerk, in het bijzonder een telefoonnetwerk en datacommunicatienetwerk dat is samengesteld uit een verzameling van knooppuntseenheden, waarbij specifieke faciliteiten binnen naar keuze vastgestelde domeinen, volledig geintegreerd kunnen worden geboden.
|
DE3629596A1
(de)
|
1986-08-30 |
1988-03-03 |
Standard Elektrik Lorenz Ag |
Schaltungsanordnung zur entkopplung der uebertragungszweige einer freisprecheinrichtung
|
US4894820A
(en)
*
|
1987-03-24 |
1990-01-16 |
Oki Electric Industry Co., Ltd. |
Double-talk detection in an echo canceller
|
IT1211194B
(it)
|
1987-07-10 |
1989-10-12 |
Olivetti & Co Spa |
Sistema di misura e compensazione automatica delle distorsioni di un collegamento tra un apparecchio telefonico e un unita centrale di trattamento voce
|
DE3728109C1
(de)
|
1987-08-22 |
1989-03-16 |
Telefonbau & Normalzeit Gmbh |
Verfahren fuer die sprachgesteuerte Daempfungsregelung in Fernsprechuebertragungskreisen
|
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
(ja)
|
1989-10-30 |
2000-09-11 |
株式会社東芝 |
電話装置
|
US5280473A
(en)
|
1990-02-08 |
1994-01-18 |
Universal Data Systems, Inc. |
Modem with echo cancellation
|
NL9001016A
(nl)
|
1990-04-27 |
1991-11-18 |
Philips Nv |
Digitale echocompensator met een dubbelspraakdetector.
|
JP3158414B2
(ja)
|
1990-06-25 |
2001-04-23 |
日本電気株式会社 |
エコーキャンセラ
|
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
|
EP0530423B1
(en)
|
1991-09-06 |
1996-12-11 |
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
|
US5388185A
(en)
|
1991-09-30 |
1995-02-07 |
U S West Advanced Technologies, Inc. |
System for adaptive processing of telephone voice signals
|
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
|
US5351031A
(en)
*
|
1993-02-16 |
1994-09-27 |
The Grass Valley Group, Inc. |
Non-linear slew rate limiter
|