子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 201 | Time shared frequency conversion system | US021941 | 1979-04-02 | US4320531A | 1982-03-16 | Donald F. Dimon |
| A frequency conversion system, including a time shared frequency converter and a time shared band limited amplification system, whereby a plurality of information bearing signals are commonly obtained, determined, filtered and amplified over a single path. The process admits signals whose carriers are separated by frequency or phase, and whose amplitudes are different.Synchronous and asynchronous receivers which ordinarily require dual mixers, filters and amplifiers are simplified by this invention. Phase locked loop demodulators, including AM, DSSC and Costas loop demodulators, which ordinarily require a pair of phase detectors, filters and amplifiers to generate the in-phase and quadrature-phase channels are simplified by this invention. The use of a common path for the in-phase and quadrature-phase channels also permits the close matching of gain and frequency response in each channel.Where a plurality of signals having diverse amplitudes are to be commonly processed herein, this invention permits selective automatic gain control by regulating the relative time each such signal is applied to the common path. | ||||||
| 202 | Narrow band level detector for detecting a periodic signal | US14742 | 1979-02-23 | US4250453A | 1981-02-10 | Lars K. Nilsson |
| A narrow band level detector for use in the frequency generating equipment of an FDM-system is described. The detector includes a product modulator one input of which receives a sine wave signal, the other input receiving an incoming signal containing the periodic signal which should be detected together with disturbing periodic signals. The sine wave signal has a determined amplitude and frequency and can be generated by an oscillator or by a phase locked loop. The output of the modulator is connected to a bandpass filter whose pass band substantially coincides with the sideband defined by the frequencies of the disturbing periodic signals. A first peak rectifier is via an amplifier connected to the output of the bandpass filter and a second peak rectifier is connected directly to the input of the detector to form a signal whose level corresponds to the maximum value of the signal from the amplifier and the detector input signal, respectively. These two signals are subtracted from each other in a subsequent adding circuit whose output signal level forms a value of the desired signal level. | ||||||
| 203 | Method of generating a direct current control signal from a noisy alternating current signal | US821120 | 1977-08-02 | US4160922A | 1979-07-10 | James E. Rickenbacker |
| A DC signal is generated having a amplitude related to the amplitude of an AC signal, with minimal delay and low sensitivity to noise in the AC signal. | ||||||
| 204 | Digital quadrature demodulator | US224523 | 1972-02-08 | US4090145A | 1978-05-16 | Joseph A. Webb |
| A quadrature analog-to-digital sampler, operating at a minimum sampling rate equal to the bandwidth of the input signal provides a pair of quadrature related digital signals which are input to first and second digital computers. The first computer calculates the instantaneous amplitude of the input signal and the second computer computes the instantaneous phase of the input signal. A third digital computer acts on the output of the second computer and differentiates the instantaneous phase of the signal with respect to time to provide frequency modulation output. | ||||||
| 205 | Glow discharge millimeter wave detector and method of biasing same | US3790895D | 1972-10-19 | US3790895A | 1974-02-05 | FARHAT N; KOPEIKA N |
| A millimeter wave glow discharge detector biased to achieve an improvement in signal to noise ratio of about 20 dB. The glow discharge detector tube comprises three or more electrodes, including an anode biased with respect to a cathode so as to generate a first discharge current which forms a high density plasma of electrons in a specific region of the tube, and a sensing electrode positioned with respect to the cathode such that it is affected by the area of high electron density, and biased to draw a relatively small second discharge current. Incident millimeter wave radiation interacts with electrons in the plasma region of the tube, resulting in changes in the second discharge current and the voltage at the sensing electrode.
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| 206 | Envelope rate demodulator | US3710267D | 1970-05-05 | US3710267A | 1973-01-09 | FAWCETT J |
| A demodulator circuit for extracting the time rate of change of the envelope of an amplitude modulated waveform, having particular application to closed loop control systems, for example, where the derived information is employed for a stabilization of an inertial platform. The envelope rate information is extracted directly from the amplitude modulated waveform by performing an integration of the waveform over an integral number of cycles of the carrier frequency, the residual integrated output providing a measure of the envelope''s time rate of change.
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| 207 | Signal amplitude and phase homodyne | US3665304D | 1970-12-28 | US3665304A | 1972-05-23 | MAYBACH RICHARD LEE |
| Homodyne signal detection apparatus which utilizes a unitary signal channel including a single mixer for processing an applied input signal with successively applied waveforms separated in phase by pi /2 radians is disclosed. The product signals of each waveform and the input signal are filtered, stored, and selectively combined to develop signals which are sinusoidal or cosinusoidal functions of the phase angle of the applied signal and have magnitudes proportional to the amplitude of the input signal.
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| 208 | Signal phase estimator | US3631351D | 1970-01-19 | US3631351A | 1971-12-28 | BUTMAN STANLEY |
| WHERE M is a multiple. The term 1/A is a term employed to make the signal z(t) equal to the signal s(t) in amplitude. A signal representing the value and sign of the time delay being estimated is then given by gamma T/8 2SGN(y)- SGN(x)SGN(y)-SAT(xSGN(x)) WHERE SGN(...) indicates the sign of the signal indicated in the parenthesis expressed as plus or minus a unit amplitude, and SAT(...) indicates a value of the expression in the brackets limited to a unit amplitude.
Apparatus is disclosed for estimating the amplitude and sign of the phase difference or time delay between a first signal z(t) and a second signal. One replica s(t) of the second signal and another s(t+(T/4)) delayed a quarter period T are correlated with the first according to the equations: |
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| 209 | Ensemble threshold detector | US3588723D | 1969-10-01 | US3588723A | 1971-06-28 | BUTLER WILLIAM F |
| AN ENSEMBLE THRESHOLD DETECTOR HAVING A RESISTANCE LADDER THAT JOINS A PLURALITY OF DETECTORS TO PRODUCE A WEIGHTING OR AVERAGING FUNCTION TO YIELD A SMOOTHED ESTMIATE OF THE MEAN OUTPUT FOR EACH DETECTOR WHICH OUTPUT IS AMPLIFIED BY A CIRCUIT ASSOCIATED WITH EACH DETECTOR AND USED AS A DETECTION THRESHOLD FOR THAT DETECTOR OUTPUT.
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| 210 | Digitalized receiver system | US3483474D | 1966-09-19 | US3483474A | 1969-12-09 | MERANDA JAMES I |
| 211 | Crossed field microwave rectifier | US3479577D | 1967-05-19 | US3479577A | 1969-11-18 | RUDEN THOMAS E |
| 212 | Pulsed and continuous wave electromagnetic signal detectors | US3465253D | 1967-02-09 | US3465253A | 1969-09-02 | RITTENBACH OTTO E |
| 213 | Magnetic field detector using a variable inductance rod | US3461387D | 1965-04-20 | US3461387A | 1969-08-12 | MORRIS FRED J; ROBERTS GEORGE F; WATERS ROBERT L |
| 214 | Apparatus for carrier phase correction | US3435343D | 1965-10-15 | US3435343A | 1969-03-25 | PIERRET JEAN-MARC |
| 215 | Receiver systems with constant false alarm rate | US3423682D | 1968-01-30 | US3423682A | 1969-01-21 | CAUCHOIS JEAN |
| 216 | Correlation detection systems | US19783362 | 1962-05-24 | US3346862A | 1967-10-10 | RAUDSEP ILMAR G |
| 217 | Waveform detector using amplitude comparison of time-space samples of the waveform | US33408563 | 1963-12-26 | US3334298A | 1967-08-01 | LARS MONRAD-KROHN |
| 218 | Remote control receiver with a detector responsive only to unmodulated carrier wave | US25333763 | 1963-01-23 | US3299358A | 1967-01-17 | WOOD RICHARD F |
| 219 | Delay line signal detector | US33324163 | 1963-12-24 | US3290649A | 1966-12-06 | WHITEHOUSE HARPER J |
| 220 | Magnetic field detecting device | US24706362 | 1962-12-26 | US3260930A | 1966-07-12 | SHIN-ICHI KAWADA |
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