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)
12/1985
12/18/1985EP0164448A1 AM demodulator
12/17/1985US4559634 PSK Modem having dual-integrator voltage controlled oscillator
12/17/1985US4559499 Direct microwave demodulator of PSK signals with automatic gain control
12/17/1985CA1198181A1 Phase synchronizing circuit
12/17/1985CA1198170A1 Non-pll concurrent carrier clock synchronization
12/17/1985CA1198169A1 Digital radio systems
12/04/1985EP0163372A2 Surface acoustic wave device for data rate reduction
12/04/1985EP0163196A2 Multi-state signal monitor circuit
12/04/1985EP0162943A1 Integrated circuit for decoding traffic radio announcement identification signals
12/03/1985US4556866 Power line carrier FSK data system
12/03/1985CA1197559A1 Frequency modulation transmitter circuit arrangements for voice or data
11/1985
11/27/1985EP0162505A1 Arrangement for generating a clock signal
11/27/1985EP0162278A1 Method for the control of the carrier of an amplitude-modulated transmitter, and circuit arrangement for carrying out the method
11/27/1985EP0162198A1 Method of and circuit for demodulating frequency shift keyed signals
11/26/1985US4555792 Transmitter for transmitting an FSK-modulated signal
11/26/1985US4555790 Digital modem having a monitor for signal-to-noise ratio
11/26/1985US4555667 Synchronous digital QPSK demodulator with carrier error correction
11/26/1985CA1197309A1 Railway signalling receiver
11/21/1985EP0161264A1 Carrier-phase adjustment using absolute phase detector.
11/19/1985US4554509 Frequency shift keyed demodulation system
11/19/1985US4554508 Carrier detection circuit
11/19/1985CA1196992A1 Data modem clock extraction circuit
11/13/1985EP0161024A1 An FSK data receiver
11/13/1985EP0160993A2 Radio-system
11/13/1985EP0160788A2 Apparatus and method for controlling a digital speech filing and retrieval system during playback mode
11/12/1985US4553237 Error-correction system for two-dimensional multilevel signals
11/12/1985US4553102 Multilevel amplitude modulation demodulator with DC drift compensation
11/12/1985US4552992 Analog signal verification circuit
11/12/1985CA1196741A1 Carbon microphone linearization technique
11/07/1985WO1985004999A1 Technique for acquiring timing and frequency synchronization for modem utilizing known (non-data) symbols as part of their normal transmitted data format
11/06/1985EP0160464A2 Method of and apparatus for determining time origin of timer for modem
11/06/1985EP0160339A2 Improvements in or relating to direct modulation FM data receivers
11/05/1985US4551846 FSK Demodulation circuit
11/05/1985CA1196397A1 Radio frequency alternate-path phase switch
10/1985
10/30/1985EP0159560A1 PSK demodulator having an AFC circuit
10/29/1985US4550292 Automatic oscillator frequency control system
10/22/1985US4549302 Modem with improved escape sequence mechanism to prevent escape in response to random occurrence of escape character in transmitted data
10/22/1985US4549142 Phase demodulator including variable phase shifter for controlling reference carrier
10/22/1985US4549049 Arrangement for testing a device provided with an echo canceller
10/22/1985CA1195740A1 Digital psk modulator for modem
10/16/1985EP0158538A2 Method and circuit for generating a time varying signal
10/16/1985EP0158515A2 Diversity system of selection type equipped with a code correction/switch circuit for receiving a psk or qam wave carrying differentially encoded signal
10/15/1985US4547888 Recursive adaptive equalizer for SMSK data links
10/15/1985US4547738 Phase shift demodulator
10/15/1985US4547736 Phase lock loop PSK demodulator with sweep control circuit
10/10/1985WO1985004541A1 Single-sideband communication system
10/08/1985US4546323 Quadrature amplitude demodulator comprising a combination of a full-wave rectifying circuit and binary detectors
10/08/1985US4546322 Adaptable demodulator for arbitrary amplitude and phase keyed modulation signals
10/08/1985CA1194955A1 Digital signal communication system
10/08/1985CA1194939A1 Multifrequency receiver
10/01/1985US4544894 Demodulation apparatus
09/1985
09/24/1985US4543547 Demodulation filter for a signal modulated in binary frequency manner
09/24/1985US4543541 FSK modulation using switched outputs of two oscillators
09/24/1985US4543066 Digital transmitter simulator
09/24/1985CA1194156A1 Phase-locked loop with d.c. modulation capability
09/24/1985CA1194139A1 Digitally controlled transversal equalizer
09/24/1985CA1194132A1 Receiver for ffsk modulated data signals
09/24/1985CA1194129A1 Method and apparatus for data transmission using chirped frequency-shift-keying modulation
09/18/1985EP0154963A2 Quarternary differential PSK demodulator
09/17/1985US4542514 Method of measuring quality of a signal received by a receiver of a two-dimensional linear modulation data communication system
09/17/1985US4542347 Demodulator circuit with integrated automatic gain control
09/17/1985CA1193773A1 Arrangement for and method of detecting multi- frequency sound code signals
09/11/1985EP0154565A2 Modem
09/11/1985EP0154503A2 Digital signal processor
09/11/1985EP0154415A1 Coded modulation system
09/10/1985US4541101 Process and device for voice interpolation in a transmission system for digitized voice
09/10/1985US4540958 Zero if frequency-modulator
09/10/1985US4540948 8-Phase phase-shift keying demodulator
09/10/1985US4540897 Digital modulation signal reading device
09/04/1985EP0153835A2 Radio receiver
09/04/1985EP0153708A2 Multi-level decision circuit
09/03/1985US4539646 For detecting the tones of an electrical multitone signal
09/03/1985US4539533 Digital MSK modulator
09/03/1985US4539524 Method and coherent demodulators for MSK signal
09/03/1985CA1192959A1 Methods and apparatus for transmitting high-bit-rate digital data in power line communication media
09/02/1985EP0151105A4 Message communication system with message storage.
09/02/1985EP0098831A4 Circuit for the suppression of the carrier.
08/1985
08/28/1985EP0153264A1 Data broadcasting system, especially towards mobile stations
08/28/1985EP0153194A2 Apparatus for cancelling periodic carrier phase jitters
08/28/1985EP0153125A2 Tone detection apparatus for use in a telephone system
08/28/1985EP0153020A2 Symmetrical polyphase networks
08/28/1985EP0152423A1 Maintenance response signalling arrangement for a digital transmission system.
08/27/1985US4538285 FM-receiver for receiving FM-signals with transmission identification
08/27/1985US4538284 Signal structures with data encoding/decoding for QCM modulations
08/27/1985US4538282 Integrated circuit PSK modem phase locked loop
08/27/1985US4538136 Power line communication system utilizing a local oscillator
08/27/1985US4538120 Carrier recovery loop for reception of quadraphase shift keyed signals
08/27/1985US4538111 Circuit recovering the carrier of a signal amplitude and phase modulated by digital signals
08/27/1985CA1192685A1 Dual tone multifrequency and dial pulse receiver
08/27/1985CA1192615A1 Carrier recovery circuit
08/21/1985EP0151916A2 Automatic gain control circuit
08/21/1985EP0151616A1 Control signalling arrangement for a digital transmission system.
08/20/1985CA1192270A1 Method and circuit for detecting a training signal
08/14/1985EP0151453A2 Correction device for first and second order amplitude distortion of the spectrum of a digital signal
08/14/1985EP0151394A2 Demodulator for ditital FM signals
08/14/1985EP0151334A2 Direct conversion frequency modulation radio receiver
08/14/1985EP0151105A1 Message communication system with message storage
08/13/1985US4535454 Multifrequency tone distribution using a conferencing arrangement
08/13/1985US4535297 Binary signal demodulator with comparative value decision circuitry
08/13/1985CA1191905A1 Spread spectrum modem
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