Patents
Sitemap › H04 - Electric communication technique › H04L - Transmission of digital information, e.g. telegraphic communication › H04L 27 - Modulated-carrier systems
Patents for H04L 27 - Modulated-carrier systems (89,721)
10/1995
10/25/1995EP0679007A1 Sound modification for use in simultaneous voice and data communications
10/25/1995EP0679000A1 Soft quantisation
10/24/1995US5461645 Frequency stabilizing device
10/24/1995US5461643 Direct phase digitizing apparatus and method
10/24/1995US5461632 Trellis coded FM digital communications system and method
10/24/1995US5461347 Apparatus and method for geometrically modulating electromagnetic radiation and a receiver for decoding geometrically modulated signals
10/24/1995US5461340 Amplitude demodulator for radio receivers to compensate for field strength influence
10/19/1995WO1995028050A1 Data level selection for multilevel vsb transmission system
10/19/1995WO1995028046A1 Method and apparatus for robust communications based upon angular modulation
10/19/1995WO1995028042A1 Heterodyne receiver having low intermediate frequency
10/18/1995EP0677966A2 Concatenated coded vestigial sideband modulation for high definition television
10/18/1995EP0677937A1 Method for detecting erasures in a multicarrier data transmission system
10/18/1995EP0677815A2 Radio-card communications system
10/18/1995EP0677202A1 Discriminating between stationary and non-stationary signals
10/18/1995EP0586554A4 Binary data error correction using hint signal
10/18/1995EP0489880B1 Maximal ratio diversity combining technique
10/18/1995CN1110491A A method and apparatus for mitigating distortion effects in the determination of signal usability
10/17/1995US5459785 DTMF signal receiving circuit
10/17/1995US5459762 Variable multi-threshold detection for 0.3-GMSK
10/17/1995US5459758 Noise shaping technique for spread spectrum communications
10/17/1995US5459750 Apparatus and method for discriminating and suppressing noise within an incoming signal
10/17/1995US5459749 Multi-level superposed amplitude-modulated baseband signal processor
10/17/1995CA2097586C Multi-modulation scheme compatible radio
10/15/1995CA2147229A1 Method for detecting erasures
10/12/1995WO1995027371A1 Data segment driven afc latch for bi-phase stable frequency phase locked loop
10/12/1995WO1995027352A1 High speed bidirectional digital cable transmission system
10/12/1995WO1995027339A1 Method and apparatus for controlling a data transmitter
10/12/1995WO1995027330A1 Synchronous detector and methods for synchronous detection
10/12/1995WO1995022884A3 Wideband square-law detector having a triangular frequency characteristic as well as a transmission system and a receiver including such a detector
10/12/1995DE4423064A1 Optical data transmission system
10/12/1995CA2186853A1 Synchronous detector and methods for synchronous detection
10/11/1995EP0676880A2 Modulator/demodulator using baseband filtering
10/11/1995EP0676096A1 Demodulator logic unit adaptable to multiple data protocols
10/10/1995US5457710 Method and circuit for detecting burst signal
10/10/1995US5457705 Method of and system for data transmission employing trellis coded modulation
10/10/1995US5457436 Balanced phase modulator used in microwave band
10/10/1995US5457424 Quadrature demodulator operable over different IF frequencies
10/10/1995US5457423 Radio data signal demodulator with clock signal recovery
10/06/1995CA2144596A1 Modulator/demodulator using baseband filtering
10/05/1995WO1995026601A2 Diversity pi/4-dqpsk demodulation
10/05/1995DE4410721A1 Modulated oscillator frequency generating circuit
10/05/1995CA2163744A1 Diversity pi/4-dqpsk demodulation
10/05/1995CA2143484A1 Sound modification for use in simultaneous voice and data communications
10/04/1995EP0675622A2 Process and system for transferring vector signal with precoding for signal power reduction
10/04/1995EP0675621A2 Quadrature modulator operable in quasi-microwave band of digital communication system
10/04/1995EP0674823A1 Path gain estimation in a receiver
10/04/1995EP0674822A1 Modulation and coding for transmission using fluorescent tubes
10/04/1995CN1109704A Method and apparatus for encoding data
10/03/1995US5455847 Clock recovery phase detector
10/03/1995US5455846 Detection of a digitally modulated signal using binary line enhancement
10/03/1995US5455845 Microwave receiver having coherent threshold detection
10/03/1995US5455839 Device and method for precoding
10/03/1995US5455544 Low power consumption binary phase-shift-keyed (BPSK) modulator using reflective electronic switching techniques
10/03/1995US5455543 Low power consumption binary phase shift keyed (BPSK) modulator using absorptive electronic switching techniques
09/1995
09/28/1995WO1995026105A1 Phase detector in a carrier recovery network for a vestigial sideband signal
09/28/1995WO1995026101A1 Carrier recovery system for a vestigial sideband signal
09/28/1995WO1995026081A1 High performance modem using pilote symbols for equalization and frame synchronization
09/28/1995WO1995026075A1 Blind equalizer for a vestigial sideband signal
09/28/1995WO1995026074A1 Carrier independent timing recovery system for a vestigial sideband modulated signal
09/28/1995WO1995024086A3 A multiple access digital transmission system and a radio base station and a receiver for use in such a system
09/28/1995DE19509728A1 Error-correcting encoder using Galois field adder and multipliers
09/28/1995CA2185801A1 High performance modem using pilote symbols for equalization and frame synchronization
09/27/1995EP0674413A2 Signal constellation time division multiplexing arrangement
09/27/1995EP0674412A2 Method and apparatus for automatic frequency control
09/27/1995EP0674387A1 Automatic frequency control method and apparatus therefor
09/27/1995EP0673576A1 Apparatus for and method of speech digitizing
09/27/1995CN1109266A Rake receiver combining all the useful multipath components of a spread spectrum signal
09/27/1995CN1109232A Method for processing and transferring data signals
09/26/1995US5454014 Digital signal processor
09/26/1995US5454012 Digital signal transmission device for improvement of anti-multipath feature, a method of the same and digital signal transmission waveform
09/26/1995US5453986 Dual port interface for a computer-based multifunction personal communication system
09/26/1995US5453715 Communication device with efficient multi-level digital demodulator
09/26/1995US5453714 Binary FM demodulator with self-adjusting resonant operating frequency according to demodulated binary output signal duty cycle
09/20/1995EP0673140A1 Digital apparatus for wideband carrier recovery
09/20/1995EP0673131A2 Hierarchical OFDM system
09/20/1995EP0673129A2 Method and apparatus for determining the C/I ratio for co-channel or adjacent channel interferene in digital mobile radio networks
09/20/1995EP0672321A1 Improved device and method for precoding
09/20/1995EP0267280B1 Interactive television and data transmission system
09/20/1995CN1108869A Quantized coherent rake receiver
09/20/1995CN1108868A Pi/4 shift dqpsk modulator
09/20/1995CN1108866A Demodulator for manchester-coded FM signals
09/20/1995CN1108835A Apparatus for use in equipment providing a digital radio link between a fixed and a mobile radio unit
09/19/1995US5452472 Radio communication receiving device detecting a frequency modulation preamble signal
09/19/1995US5452322 Receiver for digital signals transmitted in the coded differential modulation mode
09/19/1995US5452289 Computer-based multifunction personal communications system
09/19/1995US5452288 Method for the transmission of digital data in radio paging systems and corresponding radio paging receiver
09/19/1995US5452117 Direct detection of FSK
09/19/1995US5451899 Direct conversion FSK receiver using frequency tracking filters
09/16/1995CA2144663A1 Hierarchcial quadrature frequency multiplex system, transmitting apparatus and receiving apparatus therefor
09/14/1995WO1995024797A1 Compatible interactive tv and multimedia delivery system
09/14/1995WO1995024781A1 Method and apparatus for am compatible digital broadcasting
09/14/1995WO1995024780A1 Digital broadcast systems for local transmissions
09/14/1995WO1995024773A2 A data transmission method, transmitter, and receiver
09/14/1995DE4244854A1 Telefax or colour television image coding system
09/13/1995EP0671838A2 DPSK receiver with Doppler compensation
09/13/1995EP0671837A1 Delay detecting method of maximum likelihood estimation and delay detector using it
09/13/1995EP0671817A1 Soft symbol decoding for use in an MLSE-equaliser or convolutional decoder
09/13/1995EP0671082A1 Dot product circuit for multipath receivers
09/12/1995US5450612 Communication system for communicating with a plurality of selective call receivers and method therefor
09/12/1995US5450456 Method and arrangement for measuring the carrier frequency deviation in a multi-channel transmission system
1 ... 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 ... 898