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)
03/1979
03/06/1979US4143322 Carrier wave recovery system apparatus using synchronous detection
03/06/1979CA1050148A1 Seismic group recorder control system
02/1979
02/27/1979US4142245 Multi-frequency digital wave synthesizer for providing analog output signals
02/27/1979US4142241 Harmonic insensitive phase sensitive demodulator
02/27/1979US4142184 Digital multitone generator for telephone dialing
02/27/1979US4142177 Digital tone decoder system
02/22/1979WO1979000066A1 Multifrequency signal receiver
02/20/1979US4140974 Distortion corrector for the adaptive base band correction of a phase-modulated signal
02/06/1979US4138650 Phase lock loop
02/06/1979US4138644 Adaptive phase detection method and apparatus
02/06/1979CA1048177A1 Multi-channel digital modulator
01/1979
01/30/1979US4137505 Method of and apparatus for frequency control
01/30/1979US4137427 Synchronizing device for the receiver clock of a data transmission system using PSK modulation
01/30/1979CA1047612A1 Acoustic surface wave digital phase shift modulator
01/30/1979CA1047611A1 Digital tone detector using concatenated detection intervals
01/23/1979US4136327 Well survey system modulation technique
01/16/1979US4135057 High density digital transmission system
01/16/1979CA1046597A1 Automatic passband equalizer for data transmission systems
01/09/1979US4134075 Amplitude-and-phase demodulator comprising a quantization circuit
01/09/1979US4134068 Transmitter/receivers
12/1978
12/26/1978US4131882 Digital two-wire irrigation control system with feedback
12/19/1978US4130806 Filter and demodulation arrangement
12/19/1978US4130802 Unidirectional phase shift keyed communication system
12/19/1978US4130724 Data receiver with synchronizing sequence detection circuit
12/19/1978CA1044814A1 Method and apparatus for encoding data and clock information in a self-clocking data stream
12/12/1978CA1044339A1 Band pass filter circuit
12/05/1978US4128828 Differential detection systems with non-redundant error correction
11/1978
11/28/1978US4127824 Sampling filter-detector
11/21/1978CA1043024A1 Multi-frequency signaling decoder
11/14/1978US4125817 Method for stabilizing the mean-frequency and modulation slope of a phase-keyed oscillator
11/14/1978CA1042523A1 Phase filter for reducing the effects of the noise components altering discrete phase modulated signals
11/07/1978CA1042108A1 Tone detector using spectrum parameter estimation
11/07/1978CA1042076A1 Radio frequency transmitters
10/1978
10/31/1978US4123710 Partial response QAM modem
10/31/1978CA1041669A1 Circuit for transforming rectangular coordinates to polar coordinates
10/24/1978US4122300 Data transmission system and application thereof to the transmission of analog signals and of data in a network with delta modulation
10/24/1978CA1041199A1 Homodyne communication system
10/24/1978CA1041182A1 Automatic equalizing method and system
10/17/1978US4121296 Digital signal processing arrangement
10/17/1978US4121166 Phase synchronizing circuit for demodulation of multi-phase PSK signals
10/17/1978US4121165 Digital demodulator with interpolation for linearly amplitude-modulated data signals
10/17/1978US4121056 Time division digital multiplexer apparatus
10/17/1978US4121050 Differential tri-phase shift keyed modulation
10/03/1978CA1039814A1 Coherent, fixed baud rate fsk communication method and apparatus
10/03/1978CA1039660A1 Method and means of predistorting digital
09/1978
09/19/1978US4115738 Digital frequency shift signal demodulator
09/19/1978US4115687 Circuit arrangement for controlling the pulse repetition frequency of a signal
09/19/1978US4114710 Carrier regeneration circuit
09/12/1978US4114097 Frequency shift signal receiver
09/12/1978CA1038460A1 automatic frequency corrector for adifferential phase demodulator
08/1978
08/29/1978US4110725 Sequential tone acoustic command link
08/29/1978US4110706 Phase synchronizing circuit
08/29/1978CA1037565A1 Digital frequency shift-keyed transmitter
08/22/1978US4109205 Frequency modulation signalling system employing an electrical filter device
08/22/1978US4109204 Apparatus and method for wideband communication with suppression of harmonic interference
08/22/1978US4109109 Method and apparatus for detecting the presence of signal components of predetermined frequency in multifrequency pcm signal
08/22/1978US4109102 Phase synchronizing circuit
08/22/1978US4109101 Correlative converter between a 2n -ary code sequence and a 2n+1 -phase carrier pulse sequence
08/22/1978US4109100 Reverberation compensating communication system
08/08/1978US4106102 Self-adaptive digital filter for noise and phase jitter reduction
08/08/1978US4105975 Offset correction circuit for phase detectors
08/08/1978US4105863 Arrangement for combining data symbols in accordance with a predetermined weighting function
07/1978
07/25/1978US4103244 Fsk demodulator
07/18/1978US4101834 Methods and apparatus for rejection of interference in a digital communications system
07/18/1978US4101833 Duplex data transmission modem utilizing an injected tone for shifting power within the transmit spectrum
07/11/1978US4100499 Carrier synchronization system for coherent phase demodulators
07/11/1978US4100495 Adaptive method of and means for recovering digital signals
07/11/1978US4100378 Cross-correlation arrangement
07/11/1978US4100373 Adaptive linearizing acoustic coupling system
07/11/1978US4100369 Device for numerically generating a wave which is phase modulated and which is free from unwanted modulation products
07/04/1978US4099130 Phase synchronizing circuit
07/04/1978US4099121 Spatial diversity satellite communications system with error control
06/1978
06/27/1978US4097823 Transmitter wherein outputs of a plurality of pulse modulated diode oscillators are combined
06/27/1978US4097813 Carrier wave recovery circuit
06/27/1978US4097812 Frequency selective detector circuit
06/27/1978US4097807 Automatic equalizing method and system
06/20/1978US4096442 Crosstalk corrector and decision device for FSK
06/13/1978US4095187 Demodulation system for a multi-level multi-phase superposition-modulated carrier wave
05/1978
05/30/1978US4092606 Quadraphase demodulation
05/30/1978US4092599 Annunciator communication system
05/30/1978US4092596 Data transmission and reception system
05/30/1978US4092491 Differential encoding and decoding scheme for digital transmission systems
05/23/1978US4091361 Noise-immune carrier current actuated control
05/23/1978US4091331 Arrangement for compensating carrier phase errors in a receiver for discrete data values
05/23/1978US4091243 Multifrequency signal receiver
05/16/1978US4090138 FSK Transmitter having frequency band-limitation
05/16/1978US4090135 Wireless FSK technique for telemetering underground data to the surface
05/09/1978US4089061 Method and apparatus for determining the initial values of the coefficients of a complex transversal equalizer
05/09/1978US4088967 Split-ring digital phase modulator
05/09/1978US4088957 Method and apparatus for synchronously detecting a differentially encoded carrier signal
05/09/1978US4088833 Carrier detector
05/02/1978US4087677 Digital PSK modem
05/02/1978US4087638 DTMF Communication system
05/02/1978US4087628 Carrier lock detector
04/1978
04/25/1978US4086430 Detection circuitry
04/18/1978US4085449 Digital modem
04/18/1978US4085378 QPSK demodulator
04/18/1978US4085367 Method and detection of phase and frequency modulation
04/18/1978US4085295 Multi-frequency signal receivers
04/11/1978US4084137 Multidimensional code communication systems
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