| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 21 | Multilevel coded communication system employing frequency-expanding code conversion | US36923464 | 1964-05-21 | US3398239A | 1968-08-20 | GERALD RABOW |
| 22 | Apparatus for recognizing waveforms of variable time duration representing waveforms on a logarithmic time scale | US30221463 | 1963-08-14 | US3237112A | 1966-02-22 | COATES JR CLARENCE L; LEWIS II PHILIP M |
| 23 | Apparatus for recognizing waveforms of variable time duration representing the spectrum of waveforms on a logarithmic scale | US30221263 | 1963-08-14 | US3237111A | 1966-02-22 | COATES JR CLARENCE L; LEWIS II PHILIP M |
| 24 | Adaptive system | US727560 | 1960-02-08 | US3235844A | 1966-02-15 | WHITE GERALD M |
| 25 | Electrical signal analyzing systems | US3237160 | 1960-05-27 | US3134896A | 1964-05-26 | BRIGGS VERNON R |
| 26 | Adaptive filter | US727660 | 1960-02-08 | US3114884A | 1963-12-17 | JAKOWATZ CHARLES V |
| 27 | Coherent memory filter | US74079658 | 1958-06-09 | US3013209A | 1961-12-12 | BICKEL HENRY J; BERNSTEIN ROBERT I |
| 28 | Data-modulated pilots for phase and gain detectors | US15074213 | 2016-03-18 | US09813177B2 | 2017-11-07 | Maxim Gotman; Ronen Greenberger; Ziv Alina |
| Methods, systems, and devices are described for mitigating an unwanted increase in a coding rate of a wireless communication signal. A plurality of symbols including a transmitted codeword is received. The plurality of symbols including a first group of data symbols with a first modulation and coding scheme and a second group of data modulated pilot symbols with a second modulation and coding scheme. Applicable demodulation schemes are adaptively switched for each group of the plurality of symbols. The second group of data modulated pilot symbols are used in lieu of pilot symbols. The second modulation and coding scheme is a more reliable modulation and coding scheme than the first modulation and coding scheme. | ||||||
| 29 | SYSTEMS AND METHODS RELATED TO DIGITAL-TO-ANALOG CONVERSION IN RADIO-FREQUENCY APPLICATIONS | US14804270 | 2015-07-20 | US20150326244A1 | 2015-11-12 | Stephane Richard Marie WLOCZYSIAK |
| Systems and methods related to digital-to-analog conversion in radio-frequency (RF) applications. In some embodiments, a wireless system can include a baseband sub-system having a mixing circuit configured to perform a mix mode operation, and a time-interleaved digital-to-analog converter (TIDAC) circuit in communication with the mixing circuit. The TIDAC circuit can include a plurality of sample-and-hold (S/H) circuits, with each S/H circuit being configured to receive a digital signal and generate an analog signal. The baseband sub-system can be further configured to combine the analog signals associated with the S/H circuits and generate an analog output signal. The wireless system can further include an RF sub-system configured to receive the analog output signal from the baseband sub-system and generate an RF signal for transmission. | ||||||
| 30 | Mixed mode time interleaved digital-to-analog converter for radio-frequency applications | US14266844 | 2014-05-01 | US09088298B2 | 2015-07-21 | Stephane Richard Marie Wloczysiak |
| Disclosed are systems, devices and methods related to mixed mode time interleaved digital-to-analog converters (DACs). In some embodiments, such DACs can be utilized for radio-frequency (RF) applications. In some embodiments, a DAC for RF applications can include a first circuit configured to receive a digital signal and perform a first operation to yield an increased bandwidth of the DAC. The DAC can further include a second circuit configured to perform a second operation on the digital signal to yield an analog signal representative of the digital signal. The second circuit can be further configured to reduce or remove an image within the increased bandwidth. | ||||||
| 31 | DIGITAL AIR GUN | US13940994 | 2013-07-12 | US20130301393A1 | 2013-11-14 | William Allen Nance; Daniel Eugene Hobson |
| A marine air gun generates an acoustic signal in water, for example, during a marine seismic survey. The marine air gun includes digital electronic circuitry. The digital electronic circuitry may control an actuator of the marine air gun, digitize and store data from sensors located on or near the marine air gun, send and/or receive digital communications, store and/or output electrical energy, and/or perform other functions. A marine seismic source system that includes multiple air gun clusters may have a separate digital communication link between a command center and each air gun cluster. Each communication link may provide power and digital communication between the command center and one of the air gun clusters. | ||||||
| 32 | Digital air gun | US13611895 | 2012-09-12 | US08509033B2 | 2013-08-13 | William Allen Nance; Daniel Eugene Hobson |
| A marine air gun generates an acoustic signal in water, for example, during a marine seismic survey. The marine air gun includes digital electronic circuitry. The digital electronic circuitry may control an actuator of the marine air gun, digitize and store data from sensors located on or near the marine air gun, send and/or receive digital communications, store and/or output electrical energy, and/or perform other functions. A marine seismic source system that includes multiple air gun clusters may have a separate digital communication link between a command center and each air gun cluster. Each communication link may provide power and digital communication between the command center and one of the air gun clusters. | ||||||
| 33 | DIGITAL AIR GUN | US13611895 | 2012-09-12 | US20130001007A1 | 2013-01-03 | William Allen Nance; Daniel Eugene Hobson |
| A marine air gun generates an acoustic signal in water, for example, during a marine seismic survey. The marine air gun includes digital electronic circuitry. The digital electronic circuitry may control an actuator of the marine air gun, digitize and store data from sensors located on or near the marine air gun, send and/or receive digital communications, store and/or output electrical energy, and/or perform other functions. A marine seismic source system that includes multiple air gun clusters may have a separate digital communication link between a command center and each air gun cluster. Each communication link may provide power and digital communication between the command center and one of the air gun clusters. | ||||||
| 34 | Digital air gun | US12789276 | 2010-05-27 | US08279711B2 | 2012-10-02 | William Allen Nance; Daniel Eugene Hobson |
| A marine air gun generates an acoustic signal in water, for example, during a marine seismic survey. The marine air gun includes digital electronic circuitry. The digital electronic circuitry may control an actuator of the marine air gun, digitize and store data from sensors located on or near the marine air gun, send and/or receive digital communications, store and/or output electrical energy, and/or perform other functions. A marine seismic source system that includes multiple air gun clusters may have a separate digital communication link between a command center and each air gun cluster. Each communication link may provide power and digital communication between the command center and one of the air gun clusters. | ||||||
| 35 | Method and device for the recognition of modulations | US792913 | 1991-11-15 | US5271036A | 1993-12-14 | Bruno Lobert; Bruno Sourdillat |
| A method for recognizing modulation of radioelectric transmissions from instantaneous spectra of transmission observed in a determined frequency band by a Fast Fourier Transform spectrum analyze is disclosed wherein the method involves the calculation of a plurality of parameters for each transmission spectrum line which is observed. The parameters include the calculation of a mean amplitude of all the lines k of the spectrum contained in the determined frequency band and the calculation of a signal-to-noise ratio as well as a standard deviation in amplitude of each line of the spectrum. Also calculated is a coefficient of correlation COR(k,k) of amplitude of each line k with the homologous lines of the transmission spectrum contained in the determined frequency band. Subsequently, a comparison is made, through a network of neurons, of the parameters of each transmission spectrum with expected transmission parameters and an indication is made as to a correspondence between a transmission and an expected transmission when the difference detected by the comparison is at a minimum value. | ||||||
| 36 | Frequency division multiplex/FM modulation recognition system | US161514 | 1988-02-29 | US4845707A | 1989-07-04 | Ronald L. Isaacson; Amy L. Moore-McKee |
| A recognition system for comparing energy distributions of incombing emitters with known frequency spectrums is shown. Frequency spectrum analysis of randomly generated signals produces references against which the incoming communication wave may be checked. the recognition system recognizes a plurality of subchannel modulation types. Since there are many different subchannel modulation types in use today, small tactical weapons systems must recognize a number of different signals. Once certain parameters describing each subchannel modulation type are provided to the recognition system, the spectrum analysis of the subchannel modulation types is stored for subsequent use. This system provides for recognizing various FSK signals, PSK signals and OOK signals, as well as being adaptable to tracking other signals which are defined in terms of certain parameters. | ||||||
| 37 | Optical transmission system | US410741 | 1982-08-23 | US4533247A | 1985-08-06 | Richard E. Epworth |
| An optical transmission system comprises a light source, which may be coherent or incoherent, a first optical interferometer wherein light from the source is modulated, an optical path, which may be either free space or an optical fiber, along which the modulated output of the first interferometer is propagated, a second interferometer wherein light received from the optical path is demodulated, and a photodetector to which the demodulated output is applied. Typically the first interferometers is a Fabry-Perot etalon, the length of the resonant cavity of which can be altered to modulate light applied thereto. | ||||||
| 38 | Method and detection of phase and frequency modulation | US749413 | 1976-12-10 | US4085367A | 1978-04-18 | John Chamberlin Williams; William Braxton Sisco |
| There is disclosed a measurement and recording system having means for simultaneously displaying and recording the spectrum of a signal and the instantaneous phase of selected spectral components of the signal with respect to a local reference signal. Means are disclosed for displaying and recording the signal element lengths as a function of time. The system and method enables an analysis of digitally modulated signals of unknown modulation.The system also provides a means to detect faults in the system equipment that may be generating signals having undesirable variations in phase, frequency, or amplitude. | ||||||
| 39 | Signal transmission and modulation technique therefor | US3732495D | 1970-07-20 | US3732495A | 1973-05-08 | MCRAE D; PALERMO C; PELCHAT M |
| Two separate signals are derived as indicative of the information content of each of a plurality of discrete time samples of an input waveform. One of these signals effectively constitutes a stretching of the respective sample, and hence of the input waveform, by designating the deviation of the sample amplitude (or other selected parameter) from an unknown one of a set of discretely increasing reference levels greater in number than two, in a magnified format. The second signal designates the reference level with respect to which the deviation pertains, and thus resolves the ambiguity associated with the first signal. The first and second signals, or an appropriate combination thereof, are impressed on a carrier for transmission to a remote receiving station. Accompanying noise resulting from transmission is compressed in a ratio equal to the ratio of compression of the first signal at the receiving station, to reconstruct the original waveform.
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| 40 | Physiological communications system | US3524932D | 1968-09-10 | US3524932A | 1970-08-18 | STUCKI FRANK F |
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