| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 41 | Signal weighting system | US6099060 | 1960-10-06 | US3174031A | 1965-03-16 | JURIS HARTMANIS; LEWIS II PHILIP M |
| 42 | Modulation system | US48138343 | 1943-04-01 | US2445618A | 1948-07-20 | HUTCHESON JOHN A |
| 43 | Selectivity by phase quadrature method | US31642840 | 1940-01-30 | US2272840A | 1942-02-10 | HAMMOND JR JOHN HAYS; PURINGTON ELLISON S |
| 44 | Digital air gun | US13940994 | 2013-07-12 | US09612348B2 | 2017-04-04 | 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. | ||||||
| 45 | DATA-MODULATED PILOTS FOR PHASE AND GAIN DETECTORS | US15074213 | 2016-03-18 | US20160204888A1 | 2016-07-14 | 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. | ||||||
| 46 | MIXED MODE TIME INTERLEAVED DIGITAL-TO-ANALOG CONVERTER FOR RADIO-FREQUENCY APPLICATIONS | US14266844 | 2014-05-01 | US20140327561A1 | 2014-11-06 | 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. | ||||||
| 47 | DATA-MODULATED PILOTS FOR PHASE AND GAIN DETECTORS | US14132648 | 2013-12-18 | US20140177762A1 | 2014-06-26 | 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. | ||||||
| 48 | DIGITAL AIR GUN | US12789276 | 2010-05-27 | US20100302902A1 | 2010-12-02 | 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. | ||||||
| 49 | Fractional-cycle time/amplitude modulation | US653150 | 1984-09-24 | US4564823A | 1986-01-14 | John P. Stahler |
| A modulation system wherein a carrier signal is modulated by an input signal having a variable amplitude, either analog or digital. The amplitude of the input signal is sampled every predetermined fractional cycle of the modulated signal; and the carrier signal is modulated in response to the sampled amplitude of the input signal to provide a modulated signal of which each predetermined fractional cycle has an amplitude and a duration that are inversely proportional to each other and related to the sampled amplitude of the input signal. The modulated signal is demodulated by either or both of the techniques of zero-crossing detection and peak-amplitude detection. The system is self-clocking, without discontinuous phase or amplitude changes and without DC components being introduced. The system transmits its own signal-recovering clock information and thereby permits modulation at a rate in excess of the carrier signal frequency. | ||||||
| 50 | Process and a circuit arrangement for signal transmission using an amplitude-modulated radio broadcasting system | US552021 | 1983-11-17 | US4489411A | 1984-12-18 | Ole Snedkerud |
| For the simplified text or picture data signal transmission through a broadcasting system, an additional phase and/or frequency modulation is produced in amplitude modulated transmitters. In a preferred but relative slow transmission system, a frequency modulation (f.sub.1 -f.sub.n) occurs in a band width of .+-.25 Hz, whereby the transmitted quality of the simultaneously transmitted broadcast does not suffer. Depending on the type of transmission means, equipment and frequency (f.sub.o) of the carrier wave (T), this band width can be increased, for example during text transmission, in order to achieve a higher transmission speed. The system is compatible with AM mono and stero equipment as well as with printing and display installations of the electronic data processing and communication technologies. | ||||||
| 51 | Signal classifier | US29059 | 1979-04-11 | US4227255A | 1980-10-07 | Robert L. Carrick; William T. Manning; Robert E. Grimes |
| A signal classifier performs measurements on an IF signal and determines from these measurements the nature of the modulation, if any, appearing on a received high frequency communications signal. The classifier distinguishes between double sideband AM, single sideband suppressed carrier voice AM, ASK, FSK, multi-channel FSK, unmodulated carrier and noise. The measurements include AM variation, the zero crossing rate in detected AM, the percentage of time the detected AM signal level exceeds a given amplitude, and wide and narrow band detected FM. | ||||||
| 52 | Frequency rate communication system | US3754101D | 1971-07-02 | US3754101A | 1973-08-21 | DASPIT J; JACKMAN R; WEBER C |
| A communication system for transmitting a plurality of analog or digital information signals to a receiver with an improvement in band width utilization over conventional systems. A system with a plurality of swept frequency encoding signals, each frequency modulated at the same rate but with different phase, and in the preferred embodiment, means for amplitude modulating each encoding signal with a double sideband, suppressed carrier signal which may comprise two information signals, with the modulator outputs summed to provide a combined signal for further processing incorporating additional information signals and/or for transmission to a receiver. A system utilizing three such modulation arrangements for eighteen information signals and three combined signals, with the three combined signals used for amplitude modulating another set of three swept frequency encoding signals to provide a further combined signal for transmission to a receiver. A receiver with a decoding system providing the reverse of the encoding system. A receiver wherein one or more of the transmitted information signals can be selected for reproduction.
|
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| 53 | Limited energy speech transmission and receiving system | US3528011D | 1967-12-22 | US3528011A | 1970-09-08 | ANDERSON ROY E |
| 54 | Method and apparatus for interpolation and conversion of signals specified by real and complex zeros | US3510640D | 1966-05-13 | US3510640A | 1970-05-05 | VOELCKER HERBERT B JR |
| 55 | Frequency shifted sliding tone sampled data communication system | US3484693D | 1966-01-03 | US3484693A | 1969-12-16 | FONG KOUAN |
| 56 | Receiver for receiving nonorthogonal multiplexed signals | US3456195D | 1966-05-31 | US3456195A | 1969-07-15 | FULTON FORREST F JR |
| 57 | Adapting quantized filter | US6099260 | 1960-10-06 | US3174032A | 1965-03-16 | WHITE GERALD M |
| 58 | Correlation system | US65017357 | 1957-04-02 | US2906956A | 1959-09-29 | MARTIN MASONSON |
| 59 | Signaling system | US38218141 | 1941-03-07 | US2314707A | 1943-03-23 | MARTIN KATZIN |
| 60 | Means of radio transmission and reception by means of unidirectional modulation | US33912440 | 1940-06-06 | US2287173A | 1942-06-23 | JULIUS HARTZ |
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