Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 3 - Line transmission systems
Patents for H04B 3 - Line transmission systems (31,523)
06/1991
06/18/1991CA1285032C I-q channel adaptive line enhancer
06/18/1991CA1284981C Shaped wood-based active carbon
06/11/1991US5023472 Capacitor-driven signal transmission circuit
06/11/1991CA1284845C Communication system using unbalanced communication paths
06/11/1991CA1284833C Universal adapter and methods of and apparatus for making same
06/07/1991WO1991008549A1 Waveshaping transversal filter and method utilizing the same for data transmission over coaxial cable
06/04/1991US5022074 Four-wire circuit
06/04/1991US5021756 Transversal and recursive filters useable in a diplexer
06/04/1991US5021681 Jiter-invariant switched capacitor pulse shaper
05/1991
05/28/1991US5019730 Information separation device
05/22/1991EP0428199A2 Receiver for digital communication system with channel estimator
05/22/1991EP0428129A2 Method and apparatus of decision feedback equalization for multipath digital communication
05/22/1991EP0427951A2 System to generate switching criteria and equalize adaptively in data spectrum
05/22/1991EP0427713A1 Modem with improved remote echo location and cancellation
05/21/1991US5018134 Method for cancelling echo in a transmitter and an apparatus therefor
05/17/1991WO1991007833A1 Identifying telephone controller system
05/17/1991CA2068893A1 Identifying telephone controller system
05/17/1991CA2003236A1 Data input device
05/16/1991WO1991007018A1 Transmission of broadband signals
05/16/1991DE4012855C1 Telecommunications lines imitator for monitoring and testing - has electrically looped load inductance auxiliary to decoupling inductance
05/16/1991CA2072634A1 Transmission of broadband signals
05/14/1991US5016271 Echo canceler-suppressor speakerphone
05/07/1991US5014307 Method and apparatus for echo canceler disablement
05/07/1991US5014283 Arrangement for equalizing and demodulating binary continuous-phase angle-modulated data signals with modulation index 0.5
05/07/1991US5014263 Adaptive echo-canceller with double-talker detection
05/07/1991US5014232 Adaptive digital filter having non-recursive and recursive filter elements
05/02/1991EP0425070A2 One out of N checking apparatus and method
04/1991
04/30/1991US5012384 Load circuit for a differential driver
04/24/1991EP0423775A2 Receiver capable of removing both intersymbol interference and frequency offset
04/24/1991EP0423582A2 Method of amplification for burst-signals
04/18/1991WO1991005424A1 Method for terminating an isdn line
04/17/1991WO1991006148A1 In-wire selective cancellation system
04/17/1991EP0422796A2 An adaptive FIR filter having restricted coefficient ranges
04/17/1991EP0422663A2 Communicator for field instruments and method of supplying power to this communicator
04/16/1991US5008923 Testable echo cancelling method and device
04/16/1991US5008900 Subscriber unit for wireless digital subscriber communication system
04/12/1991CA2027236A1 Adaptive fir filter having restricted coefficient ranges
04/10/1991EP0421962A1 A method and device for performing an approximate arithmetical division
04/10/1991EP0421601A2 Linearizer for QAM-receiver
04/10/1991EP0421533A1 Predistortion apparatus for a digital transmission system
04/09/1991US5007047 Adaptive rate control for echo cancelling modem
04/09/1991CA1282883C Remote disconnection and short-circuiting apparatus and method
04/09/1991CA1282877C Transmitter/receiver apparatus
04/07/1991CA2026820A1 Predistortion arrangement for a digital transmission system
04/05/1991WO1991005305A1 A method and device for performing an approximate arithmetical division
04/04/1991WO1990013950A3 Power-line communication apparatus
04/04/1991DE4027331A1 Fault detection in self checking circuit - uses line monitoring and polarity reversal of supply to circuits via diode bridges
04/04/1991DE3931539A1 Terminal connector to voltage supply bus - has diode between bus and connector in front of output coupling capacitors
04/04/1991DE3931537A1 Terminal connector to voltage supply bus=bar - has output coupler for each terminal, with voltage limiting zener diode parallel to output coupler output
04/03/1991WO1991005293A1 Field-mounted control unit
04/03/1991EP0420269A2 Adaptive digital filter including low-pass filter
04/02/1991US5005212 Interference suppression in optical communication systems
04/02/1991US5005185 Parallel mode adaptive transversal equalizer for high-speed digital communications system
04/02/1991US5005184 Method and apparatus for waveform equalization
04/02/1991US5005168 Multirate wire line modem apparatus
04/02/1991CA1282511C Voice control circuit for a communication terminal
03/1991
03/27/1991EP0419225A2 Transversal type automatic equalizer with tap coefficient protection
03/27/1991EP0419047A2 Spread spectrum communications system using chirp modulation
03/26/1991US5003555 Data transmission system comprising a decision feedback equalizer and using partial-response techniques
03/21/1991WO1991003896A2 Computer communications system
03/21/1991WO1991003887A1 Three wire system for cochlear implant processor
03/20/1991EP0417272A1 Receiver for quadraphase modulation signals.
03/20/1991CN1012121B Volume range control circuit
03/19/1991US5001747 Frequency offset estimator for data modem
03/19/1991US5001701 Subband echo canceler including real time allocation among the subbands
03/19/1991US5001480 Analog-to-digital and digital-to-analog conversion system and echo cancellation device including the same
03/19/1991CA1281783C Method and apparatus for equalization of data transmission system
03/19/1991CA1281768C Protection arrangements for communications lines
03/13/1991EP0416498A1 Generalised coupler in multilevel structure
03/13/1991EP0282572A4 Responder unit for energy management system
03/12/1991US4999830 Communication system analog-to-digital converter using echo information to improve resolution
03/12/1991CA1281407C Directional comparison blocking system
03/09/1991CA2024853A1 Generalized coupler multilevel structure
03/08/1991CA2022237A1 Three wire system for cochlear implant processor
03/07/1991WO1991003116A1 Device for treating echoes, particularly acoustic echoes, in a telephone line
03/06/1991EP0414830A1 Adaptive pal or nstc comb filter
03/05/1991US4998241 Echo canceller
03/05/1991US4998069 Loopback tester for testing field replaceable units
03/01/1991WO1991003886A1 Coupler verification test circuit
03/01/1991CA2065458A1 Coupler verification test circuit
02/1991
02/27/1991EP0413934A2 Transmission line frequency equalizer
02/27/1991CN1049581A Subscriber unit for wireless digital subscriber communication system
02/26/1991US4996706 Method of controlling the electric power supplied to a modem
02/26/1991US4996497 Cable compensation circuit
02/21/1991WO1991002407A1 Wideband digital equalizers for subscriber loops
02/20/1991EP0413641A1 Arrangement for echoprocessing, especially acoustic, in a telephone line
02/20/1991EP0413073A1 Adaptive loop gain phase filter
02/20/1991EP0151616B1 Control signalling arrangement for a digital transmission system
02/19/1991US4995104 Interference cancelling circuit and method
02/19/1991US4995057 Technique for achieving the theoretical coding gain of digital signals incorporating error correction
02/19/1991US4995031 Equalizer for ISDN-U interface
02/19/1991US4995030 Far end echo cancellation method and apparatus
02/19/1991US4994759 Current equalizing circuit
02/19/1991CA1280483C Power line communication system
02/19/1991CA1280481C Adaptive echo canceller with sparse dynamically positioned taps
02/13/1991EP0412691A2 Subband echo conceler including real time allocation among the subbands
02/13/1991EP0412560A2 Hybrid circuit
02/12/1991US4993047 Volterra linearizer for digital transmission
02/12/1991US4992774 Method for powering remote visual displays and allowing for data exchange over the same wire pair
02/07/1991WO1991001593A1 Saw device tapped delay line and apparatus using same
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