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)
10/1991
10/08/1991US5056108 Communication system
10/08/1991US5055845 Signal digitizing method and system utilizing time delay of the input signal
10/02/1991EP0449146A2 Circuit for demodulating PSK modulated signal by differential-detection
10/02/1991CN1014200B Digital automatic gain control
10/01/1991US5054037 Method of servo-controlling the parameters of a modulator having 2n phase and amplitude states, and a circuit for implementing the method
10/01/1991US5054036 Digital signal coding
10/01/1991US5054034 Ensemble modem structure for imperfect transmission media
10/01/1991US5053860 Method and apparatus for the transmission and reception multicarrier high definition television signal
10/01/1991US5053728 Phase locked loop frequency modulator using data modulated digital synthesizer as reference
10/01/1991US5053717 FSK demodulator
10/01/1991CA2078445A1 Method and apparatus for transmitting and receiving ofdm carriers
10/01/1991CA1290081C Multicarrier demodulator
09/1991
09/25/1991EP0448493A1 Flexible broadcasting method of image sequences towards mobile stations and receiver therefor
09/25/1991EP0448492A1 Apparatus for the transmission of digital data with at least two levels of protection, and corresponding receiver
09/25/1991EP0448251A2 Demodulating system capable of accurately equalizing received signals using error correction codes
09/25/1991EP0448048A2 A signal detecting circuit for detecting a signal specified in a designated frequency
09/25/1991EP0448045A1 System for suppressing spread of error generated in differential coding
09/25/1991EP0387245B1 Digital dqpsk decoder circuit element
09/25/1991EP0267280A4 Interactive television and data transmission system
09/25/1991CN1054869A High speed half duplex modem with fast turnaround protocol
09/25/1991CA2038920A1 Circuit for demodulating psk modulated signal by differential-detection
09/24/1991US5052020 Method of and apparatus for controlling modulation of digital signals in frequency-modulated transmissions
09/24/1991US5052000 Technique for improving the operation of decision feedback equalizers in communications systems utilizing error correction
09/24/1991US5051709 Saw device tapped delay line and equalizer
09/24/1991CA1289634C Digital modulator
09/24/1991CA1289624C Method and apparatus for setting the signal-to-noise ratio of a carrier wave
09/21/1991WO1991015065A1 Cable television radio frequency subscriber data transmission apparatus and rf return method
09/21/1991WO1991015064A1 Cable television radio frequency return method
09/21/1991WO1991015063A1 Cable television radio frequency subscriber data transmission apparatus and calibration method
09/21/1991WO1991015062A1 Cable television radio frequency data processor
09/21/1991CA2078563A1 Cable television radio frequency subscriber data transmission apparatus and rf return method
09/21/1991CA2078562A1 Cable television radio frequency data processor
09/21/1991CA2078561A1 Cable television radio frequency return method
09/21/1991CA2078548A1 Cable television radio frequency subscriber data transmission apparatus and calibration method
09/18/1991EP0446239A1 Digital to amplitude modulated analog converter
09/17/1991US5050192 Automatic gain control
09/17/1991US5050188 Method and apparatus for transmitting coded information
09/17/1991US5050176 Direct modulation phase-shift-keying system and method
09/17/1991US5049839 Biphase modulaton circuit having continuous phase changes
09/17/1991US5049830 Carrier recovery system and digital phase demodulator
09/17/1991CA1289200C Variable bit rate clock recovery circuit
09/12/1991DE4007167A1 Security recognition monitoring circuitry for data transmission - evaluates frequencies and compares with threshold value for quality test
09/11/1991EP0446190A2 Direct phase digitization
09/11/1991EP0446024A2 Spread-spectrum communication system
09/11/1991EP0445522A2 Satellite transmission capturing method for GPS receiver
09/11/1991EP0377687A4 Spectrally efficient method for communicating an information signal
09/11/1991EP0341256A4 Modem and method using multidimensional coded modulation
09/10/1991US5048086 Encryption system based on chaos theory
09/10/1991US5048059 Log-polar signal processing
09/10/1991US5048058 MSK modulation and differentially coherent detection transmission system
09/10/1991US5048057 Wireless local area network
09/10/1991US5048056 Method and apparatus for mapping an eight dimensional constellation of a convolutionally coded communication system
09/10/1991US5048054 Line probing modem
09/10/1991CA1288878C Timing and carrier recovery in tdma without preamable sequence
09/09/1991WO1991014329A1 Direct phase digitization
09/07/1991WO1991014316A1 Multi-frequency differentially encoded digital communication for high data rate transmission through unequalized channels
09/07/1991CA2054906A1 Multi-frequency differentially encoded digital communication for high data rate transmission through unequalized channels
09/05/1991WO1991013506A1 Hybrid analog/digital signal processing
09/04/1991EP0444322A2 Car radio with digital equalizer
09/04/1991EP0444114A1 Digital differential phase-shift keyed decoder
09/03/1991WO1991013370A1 Time domain radio transmission system
09/03/1991US5046073 Signal processing apparatus for recovering a clock signal and a data signal from an encoded information signal
09/03/1991US5045816 Binary phase shift key modulator with programmable level control
09/03/1991US5045799 Peak to average power ratio reduction in a power amplifier with multiple carrier input
09/03/1991CA1288519C Viterbi decoder with reduced number of data move operations
08/1991
08/21/1991EP0442611A2 RF signal synthesis
08/21/1991EP0442041A2 Integrated digital signal processor/general purpose CPU with shared internal memory
08/21/1991EP0441851A1 Satellite radio receiver
08/21/1991EP0441828A1 Method for converting and method for processing electronic multiplex signals, and apparatus for processing such signals
08/21/1991EP0441808A1 Method and apparatus for decoding a quadrature modulated signal
08/21/1991EP0190166B1 Rf amplifier with frequency spectrum control
08/20/1991US5042052 Carrier acquisition scheme for QAM and QPSK data
08/14/1991EP0441732A1 Receiver for time-frequency interleaved digital data using a Nyquist time window
08/14/1991EP0441731A1 Method of data broadcasting using time-frequency interleaving and coherent demodulation
08/14/1991EP0441730A1 Method of data broadcasting with time-frequency interleaving, using frequency reference signals
08/14/1991EP0441593A2 Automatic frequency control circuit
08/14/1991EP0441580A2 Circuit for reducing distortion produced by an r.f. power amplifier
08/14/1991EP0441280A1 Method and apparatus for decoding two frequency (F/2F) data signals
08/14/1991EP0441110A1 A method of compensating for non-linearities in an end amplifier incorporated in a radio transmitter
08/13/1991US5040194 Method and apparatus for providing for automatic gain control of incoming signals in a modem
08/13/1991US5040192 Method and apparatus for optimally autocorrelating an FSK signal
08/13/1991US5040191 Partial response channel signaling systems
08/13/1991US5040190 Analog data station terminal
08/13/1991US5040181 Non-intrusive diagnostic system for a digital modem transmission channel, including an A/D converter clocked at a multiple of the symbol rate
08/13/1991US5039987 Circuit for converting a phase signal to an amplitude signal
08/13/1991US5039959 Phase switching circuit
08/13/1991US5039951 Josephson junction FSK demodulator
08/07/1991EP0440187A2 Arrangement for converting binary input signal into corresponding in-phase and quadrature phase signals
08/07/1991EP0439925A2 Maximum likelihood decoding with interference detection for frequency-hopped coded modulation systems
08/07/1991EP0439539A1 Transmitter, transmission method and receiver.
08/07/1991CN1053719A Method of compensating for non-linearities in end amplifier incorporated in radio transmitter
08/07/1991CN1013469B Modem with improved digital signal processor
08/06/1991US5038402 Apparatus and method for providing digital audio in the FM broadcast band
08/06/1991US5038365 Modem having a software-adapted modulation rate
08/06/1991CA1287383C 8-phase phase-shift keying demodulator
07/1991
07/30/1991US5036526 Method of communicating stuffing indications in a multi-level communications system
07/30/1991US5036296 Frequency tracking circuit using samples equalized at different sampling instants of same clock period
07/30/1991CA1287130C Phase modulator apparatus for generating a burst phase-modulated wave
07/30/1991CA1287127C Fsk demodulation circuit
07/30/1991CA1287126C Method and device for detecting false lockings of the reference signal onthe signal to be demodulated during a coherent digital demodulation
1 ... 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 ... 898