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4470145 |
Single sideband quadricorrelator
A supplementary frequency acquisition circuit in the form of a frequency difference detector called a single sideband quadricorrelator is provided. When used in conjunction with a phase-locked loop...
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4468793 |
Global position system (GPS) multiplexed receiver
A global positioning system comprises an RF receiver for receiving L 1 , L 2 p-code or ca code modulated frequency outputs from one or more space vehicles, a multiplexer operably connected to the...
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4455680 |
Method and apparatus for receiving and tracking phase modulated signals
A receiver for tracking and demodulating several types of phase modulated communications, either analog or digital data, for either residual carrier or suppressed carrier signal and for phase...
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4419759 |
Concurrent carrier and clock synchronization for data transmission system
The present invention is directed to circuitry for achieving concurrent synchronization of carrier phase and clock timing in double-sideband, suppressed carrier transmissions systems. A phase-lock...
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4379266 |
PSK Demodulator with automatic compensation of delay induced phase shifts
This circuit compensates for phase variation introduced by the delay element in a PSK (phase shift keyed) demodulator. The signal to be demodulated is split. One portion is delayed while the other...
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4361894 |
Band-pass filter circuit
A band-pass filter circuit comprising a band-pass filter for removing noise modulation components from an input signal comprising a carrier sine wave, a phase detector for detecting a phase...
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4328587 |
Phase slip detector and systems employing the detector
A phase slip detector and systems employing said detector comprises a frequency detector for detecting an instantaneous value of received carrier frequency and an integrator for integrating the...
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4322851 |
Decoding logic for frequency shift keying receiver
A radio receiver employing paired signal paths with frequency shift keying. In each signal path pair in which demodulated signals in quadrature are produced, the outputs of the limiting amplifiers...
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4313219 |
Receiver for high frequency electromagnetic oscillations having a frequency readjustment
A receiver for high frequency electromagnetic oscillations, having frequency readjustment with a voltage-control oscillator, includes a phase control loop for regaining the carrier in the signal...
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4186347 |
Radio frequency arraying method for receivers
A method and apparatus for increasing the signal-to-noise ratio of a receiving facility for coherent frequency reception by arraying receiving systems using separate antennas for each, or one...
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4169246 |
Digital carrier correction circuit
A carrier correction circuit accepts a serial digital data input stream having an underlying carrier frequency associated with it and generates a corrected carrier signal synchronized with the...
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4103244 |
FSK demodulator
An FSK demodulator is provided with an AFC circuit. The AFC circuit is a negative feedback loop having at least n stable points corresponding to n-level transmitting frequencies. The cut-off...
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4097813 |
Carrier wave recovery circuit
A circuit for extracting a carrier wave signal from a double binary PSK signal input is disclosed. The PSK input signal is applied to a first frequency doubler which doubles the frequency of the...
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4039961 |
Demodulator for combined digital amplitude and phase keyed modulation signals
A digital carrier signal demodulation circuit is used in the carrier digital transmission system utilizing a 16-ary APK (Amplitude and Phase Keying) signal produced by the vector superposition of a...
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3911219 |
Automatic frequency control for differentially coherent phase detection
Automatic frequency control apparatus is provided for controlling the carrier frequency of a differentially coherent phase-shift keyed (DC-PSK) carrier signal. More particularly, the binary signal...
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3902014 |
Circuit arrangement for regenerating the modulation timing of a line signal in a data transmission equipment
A circuit arrangement in the receiver of a data transmission equipment for regenerating the modulation timing of an incoming line signal includes a detector for detecting the modulation timing of...
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3835404 |
EXTRACTING CIRCUIT FOR REPRODUCING CARRIER SIGNALS FROM A MULTIPHASE MODULATED SIGNAL
A carrier reproducing circuit for demodulating a signal transmitted by a pulse coded modulation-multiphase modulation system in which the output of a carrier extracting circuit is sampled by a...
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3711777 |
LATCHING AND CONTROL CIRCUIT FOR CARRIER DETECTION
A carrier detection circuit for a modem receiver wherein a carrier detect flip-flop is latched upon receipt of initial mark signals of a message. Logic circuits responsive to end-of-transmission...
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3701023 |
PHASE JITTER EXTRACTION METHOD FOR DATA TRANSMISSION SYSTEMS
A carrier recovery method and apparatus for generating a carrier having the proper frequency, relative phase and phase jitter to accurately demodulate a modulated signal having phase jitter. The...
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3480869 |
TIMING RECOVERY CIRCUIT FOR USE IN FREQUENCY-MODULATED,DIFFERENTIALLY COHERENT PHASE MODULATION (FM-DPM) COMMUNICATION SYSTEM
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3353102 |
Frequency shift receiver with noise frequency detection
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