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| Number | Title | Issue Date |
| 4037161 | Ratio detector An electro-optical device for generating data signals representing relative displacement between an aperture pattern in a reference plane and a reflective pattern in a measurement plane comprises a reference detector for sensing reference radiation direct... | 07/19/1977 |
| 4034309 | Apparatus and method for phase synchronization In a phase locking oscillator servosystem, the phase of a voltage controlled oscillator (VCO) is determined by a stored control voltage representative of phase error. Positive and negative constant current sources are switched to an integrator, which prov... | 07/05/1977 |
| 4031317 | Data communications system with improved digital phase-locked loop retiming circuit A digital timing recovery circuit is disclosed for synchronously transmitting digitally encoded data in a multiterminal configuration between a data processor and a plurality of data terminals associated therewith. Phase shifted synchronous data from the ... | 06/21/1977 |
| 4031478 | Digital phase/frequency comparator Two D-type flip flops have a clock and a 1/4-bit delayed clock coupled to the D inputs of respective ones of the two flip flops to provide a +/- phase error of a present sample of digital data coupled to the clock inputs of the two flip flops and a second... | 06/21/1977 |
| 4028587 | Marker circuit A circuit is provided for use with a swept frequency test system to produce a marker on the system display when the swept frequency signal reaches one or more predetermined reference frequencies. The marker circuit mixes the swept frequency signal with a ... | 06/07/1977 |
| 4025775 | Correlator device The present invention relates to devices for correlating two phase-modulated signals, in order to determine the delay between said two signals. The signals are applied to phase detectors which receive one and the same local wave. One of the signals is del... | 05/24/1977 |
| 4023110 | Pulse comparison system The position of one pulse relative to a reference pulse is obtained by hag the one pulse set a string of flip-flops until the setting is inhibited by a stop signal generated by the second pulse. The condition of the flip-flops is read by an encoded netwo... | 05/10/1977 |
| 4021742 | Phase compressor for phase modulated signal A phase compressor for a phase modulated signal comprises n phase suppressors (n is an integer greater than 2), each of which includes an adder and a limiter. The n phase suppressors are connected in series with one another. In this case, outputs from the... | 05/03/1977 |
| 4021653 | Digital programmable tone detector An improved detection arrangement for detecting the presence of a given tone in a received input signal. A reference generator, in the form of a reference clock and a programmable divider, produces a first reference frequency, equal to the frequency of th... | 05/03/1977 |
| 4011503 | Apparatus for measuring the phase relation of two alternating current signals A known reference signal is applied to a zero crossing detector and normal and inverted outputs from the zero crossing detector are applied to the input control terminals of a pair of bilateral switches. A measured signal of the same frequency but not nec... | 03/08/1977 |
| 4001682 | Ambiguity free digital averaging phase meter The inherent phase ambiguity that results from the measurement of the phase difference between a reference signal and a data signal having a zero phase relationship is eliminated by adding 360° to phase differences between 0° and 180°. Phase difference... | 01/04/1977 |
| 3993984 | Electronic underfrequency relay A method and apparatus for detecting an underfrequency condition of an alternating current power line is disclosed wherein the frequency of the power line is sensed, an underfrequency signal is developed whenever the power line frequency decreases below a... | 11/23/1976 |
| 3989931 | Pulse count generator for wide range digital phase detector A wide range digital phase detector employs a pulse count generator which provides mutually exclusive counting pulses corresponding to the pulses in the two pulse trains to be compared, thereby ensuring that all pulses including those which are coincident... | 11/02/1976 |
| 3984771 | Accurate digital phase/frequency extractor Digital apparatus employing a direct frequency synthesizer for accurately measuring the phase difference between a received signal and a phase reference signal by calculating a coarse value based on the synthesizer's internal clock and subtracting therefr... | 10/05/1976 |
| 3949314 | Phase demodulator A reference carrier signal is combined with a phase modulated signal of the same basic frequency to generate an output signal the amplitude of which varies in accordance with the phase difference between the phase modulated signal and the reference carrie... | 04/06/1976 |
| 3947777 | Circuit arrangement for the demodulation of a phase-modulated signal Apparatus for demodulating phase modulated signals is described. The latter signals are produced by modulation of a carrier or harmonically related carriers. The modulated signal, constituted by consecutive modulation sections, is coupled to an analogue m... | 03/30/1976 |
| 3940693 | Phase sensitive detector A phase detector which utilizes an amplifier that has the input signal coed by resistive elements to both its non-inverting and inverting input terminals operates with an amount of negative feedback determined by the magnitude of the resistive element as... | 02/24/1976 |
| 3938052 | Digital demodulator for phase-modulated waveforms Digital logic apparatus for demodulating a received phase-modulated carrier wave wherein phase-shifts between successive signalling intervals encode data elements. A shift register serially stores periodic samples of a squared version of the received wave... | 02/10/1976 |
