| 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 | RECEIVER FOR DIGITAL TERRESTRIAL BROADCASTING | PCT/JP1999/006266 | 1999-11-11 | WO00030254A1 | 2000-05-25 | |
| A receiver for digital terrestrial broadcasting, which can receive a digital broadcasting of a channel that the user wants to receive without any error by solving the problems caused by the transition of terrestrial broadcasting from the analog system to digital one. The regular frequency, upper-offset frequency, and lower-offset frequency assigned for the digital broadcasting for each channel are stored in a channel initial data storage unit (17) of a digital terrestrial broadcasting receiver (100). When the user specifies a desired channel, a front end unit (13) is operated based on the three assigned frequencies, and the frequency of digital broadcasting out of the three frequencies is found based on the OFDM synchronizing signal outputted from an OFDM demodulating unit (39) of the front end unit (13). | ||||||
| 42 | Receiver tuning | PCT/IB9701016 | 1997-08-21 | WO9813934A3 | 1998-05-28 | KIANUSH KAVEH; MEEUWIS JOHANNES CORNELIS MARI |
| In a tuning method, a commanded-tuning loop (CTL) tunes a receiver (REC) on the basis of a tuning command (TC) and a self-tuning loop (STL) tunes the receiver on the basis of a reception signal. To resolve a tuning conflict between the loops, one of the loops (CTL or STL) is calibrated (CAL) with respect to the other loop (STL or CTL). Preferably, the commanded-tuning loop (CTL) is in an active state when the self-tuning loop (STL) is in-lock. This allows good reception under dynamic reception conditions. | ||||||
| 43 | Partition a radio into a service chain and a scan chain to scan channels | US16616754 | 2017-06-09 | US11304048B2 | 2022-04-12 | Shahnawaz Siraj; Sachin Ganu; Andre Beaudin; Ben Dunsbergen; Manoj Thawani; Qiang Zhou |
| Example implementations relate to partitioning a radio into chains to scan channels. In some examples, a network device may comprise a processing resource and a memory resource storing machine-readable instructions to partition a default radio of the network device into a service chain and a scan chain in response to a scan request, scan a particular channel with the scan chain to discover devices operating on the particular channel of a network, and combine the service chain and the scan chain into the default radio. | ||||||
| 44 | Charging apparatus | US16219115 | 2018-12-13 | US11081895B2 | 2021-08-03 | Yoshihiko Hiroe; Tomoya Ono; Hidetoshi Kusumi |
| A charging apparatus includes a plurality of batteries, a changeover relay that can be changed over between a first state where the plurality of the batteries are connected in series to one another and a second state where the plurality of the batteries are connected in parallel to one another, an electric storage device, a main relay that is provided between the electric storage device and an electric load of a vehicle, and a control device that controls the opening/closing of the changeover relay. The control device renders the changeover relay in the first state when the main relay is in an open state. | ||||||
| 45 | Molecular clock | US16233982 | 2018-12-27 | US10739728B2 | 2020-08-11 | Ruonan Han; Cheng Wang |
| A molecular clock which utilizes a rotational spectrum of gaseous molecules in a sub-THz region for clock stabilization is described. The molecular clock has a fast start-up characteristic and is also robust against mechanical vibration or variation of electromagnetic field. Also described is a chip-scale implementation of a molecular clock. In an embodiment, a molecular clock chipset only consumes a DC power of 66 mW. While providing a highly stable, compact and energy efficient time generator of portable devices. | ||||||
| 46 | Selectively activating oscillation modules based on signal strengths | US15486909 | 2017-04-13 | US10382078B2 | 2019-08-13 | Subhashish Mukherjee; Yogesh Darwhekar; Nagaraj V. Dixit; Raghu Ganesan |
| At least some embodiments are directed to a receiver system that comprises a first oscillation module configured to provide oscillating signals of differing frequencies and a second oscillation module configured to provide other oscillating signals of the differing frequencies. The second oscillation module is configured to produce less noise than the first oscillation module. A controller is coupled to the first and second oscillation modules and configured to selectively activate and deactivate each of the first and second oscillation modules based on signal strengths of primary signals received via a wireless medium and based on signal strengths of interference signals received via the wireless medium. | ||||||
| 47 | ADJUSTMENT OF POWER AND FREQUENCY BASED ON THREE OR MORE STATES | US15665091 | 2017-07-31 | US20170330732A1 | 2017-11-16 | John C. Valcore, JR.; Bradford J. Lyndaker |
| Systems and methods for adjusting power and frequency based on three or more states are described. One of the methods includes receiving a pulsed signal having multiple states. The pulsed signal is received by multiple radio frequency (RF) generators. When the pulsed signal having a first state is received, an RF signal having a pre-set power level is generated by a first RF generator and an RF signal having a pre-set power level is generated by a second RF generator. Moreover, when the pulsed signal having a second state is received, RF signals having pre-set power levels are generated by the first and second RF generators. Furthermore, when the pulsed signal having a third state is received, RF signals having pre-set power levels are generated by the first and second RF generators. | ||||||
| 48 | Timing synchronization circuit for wireless communication apparatus | US14452535 | 2014-08-06 | US09465404B2 | 2016-10-11 | Inayat Ali; Arvind Kaushik; Sachin Prakash; Arindam Sinha |
| A transmission node includes a digital front-end device that provides functional clocks for JESD204B based data transmission. The front-end device includes a PLL for generating a phase locked clock based on a device clock of the front-end device, a clock dividing unit for generating the functional clocks by dividing the phase locked clock, a clock gating unit connected between the PLL and the clock dividing unit, and a system reference signal sampling unit for timing radio frame boundaries. The clock gating unit gates the phase locked clock to align the functional clocks with the device clock within a predetermined number of cycles of the phase locked clock, upon locking of the PLL or receipt of a system resynchronization request. The system reference signal sampling unit samples the system reference signal with zero-cycle latency between device clock and phase locked clock. | ||||||
| 49 | State-based adjustment of power and frequency | US13620386 | 2012-09-14 | US09197196B2 | 2015-11-24 | John C. Valcore, Jr.; Bradford J. Lyndaker |
| Systems and methods for state-based adjustment of power and frequency are described. A primary generator of a system includes a primary power supply for supplying a primary radio frequency (RF) signal to an electrode. The primary generator further includes an automatic frequency control (AFC) to provide a first frequency input to the primary power supply when a pulsed signal is in a first state. A secondary generator of the system includes a secondary power supply for supplying a secondary RF signal to the electrode. The secondary generator also includes an AFC to provide a second frequency input to the secondary power supply when the pulsed signal is in the first state. The secondary generator includes an AFC to provide a third frequency input to the secondary power supply when the pulsed signal is in a second state. The system includes a digital pulsing source for generating the pulsed signal. | ||||||
| 50 | Low-loss tunable radio frequency filter | US13282289 | 2011-10-26 | US08797120B2 | 2014-08-05 | Genichi Tsuzuki; Balam A. Willemsen |
| A tunable RF filter comprises a signal transmission path having an input and output, a plurality of resonant elements disposed along the signal transmission path between the input and output, and a set of non-resonant elements coupling the resonant elements together to form a stop band having a plurality of transmission zeroes corresponding to respective frequencies of the resonant elements, and at least one sub-band between the transmission zeroes. The set of non-resonant elements comprises a first plurality of non-resonant elements respectively coupled in parallel with the resonant elements, and a second plurality of non-resonant elements respectively coupled in series with the resonant elements. The first plurality of non-resonant elements comprises at least one variable non-resonant element for selectively introducing at least one reflection zero within the stop band to create a pass band in one of the one sub-band(s) without varying any of the second plurality of non-resonant elements. | ||||||
| 51 | Radio-frequency communication control system, radio-frequency communication control method and computer-readable storage medium | US11189326 | 2005-07-26 | US07881676B2 | 2011-02-01 | Hideki Uchikawa; Kentaro Fukushima; Hideyuki Araki |
| An RF communication control system for executing the process of transmitting and receiving an RF signal through an RF control circuit unit and digitally processing the data contained in the RF signal through a baseband circuit unit, is disclosed. The baseband circuit unit includes a setting parameter holder for holding the setting parameter of each of a plurality of RF control elements, a setting parameter determining unit for determining, when the RF control element connected to the baseband circuit unit is switched to a second RF control element, the setting parameter to be used by the second RF control element after switching based on the setting information supplied from an external source, and a setting parameter selection processing unit for selecting the setting parameter corresponding to the second RF control element from the setting parameter holder based on the determined result and sending out the setting parameter to the second RF control element. An RF communication control method using the RF communication control system and a computer-readable storage medium to store the program for executing the RF communication control method by the computer, are also disclosed. | ||||||
| 52 | High-frequency switch | US11034278 | 2005-01-12 | US20050122184A1 | 2005-06-09 | Mitsuhide Kato |
| A high-frequency switch includes a transmission terminal, an antenna terminal, a reception terminal, and a voltage-control terminal; a first diode, the cathode thereof being electrically connected to the transmission terminal, and the anode being electrically connected to the antenna terminal; a first transmission line, electrically connected between the antenna terminal and the reception terminal; a second diode, the cathode thereof being electrically connected to the reception terminal, and the anode being electrically connected to the voltage-control terminal; a second transmission line, one end thereof being electrically connected to the transmission terminal, and the other end being connected to ground; and a capacitor, electrically connected between the voltage-control terminal and ground. The above high-frequency switch can be miniaturized and has superior performance. | ||||||
| 53 | Automatic frequency control method and apparatus therefor | US411211 | 1995-03-27 | US5566211A | 1996-10-15 | Yang-seok Choi |
| An automatic frequency control apparatus used in an MPSK communication system detects a frequency offset between a carrier and a local oscillation signal for adjustment of a local oscillation frequency. A phase difference detector generates a first phase difference detection signal having, as a phase value, a difference between the phases of various samples of the sampled signal. A phase altering unit generates a second phase difference detection signal having a phase value different from that of the first phase difference detection signal. A frequency offset signal generator estimates transmission phase information by using the phase value of the second phase difference detection signal and reference phase signals used for MPSK modulation, thereby generating a frequency offset signal which is determined by the transmission phase signal and the second phase difference detection signal. The result is that the number of the reference phases which are used for determination of the transmission phase information by altering the phase of the phase difference signal, is reduced. Accordingly, the hardware cost for implementing the apparatus can be lowered. The invention can be used for automatic frequency control in a modem which is used for all the types of MPSK modulation. | ||||||
| 54 | Receiver comprising an arrangement for estimating a frequency deviation | US691204 | 1991-04-25 | US5434889A | 1995-07-18 | Alfred Baier |
| In a base band conversion receiver, frequency deviation in the base band signal due to tolerances and drift of the transmitter frequency and of the mixing frequencies in the receiver is compensated by an automatic control. The signal converted to the base band is applied to a channel estimator which forms a channel estimation vector as an estimate of the instantaneous channel impulse responses in a complex bag band representation. A frequency deviation estimator evaluates the changes in time these channel estimation vectors. | ||||||
| 55 | Transmitter-receiver | US839607 | 1992-02-21 | US5309429A | 1994-05-03 | Kunio Fukuda |
| A TDD type transmitter-receiver capable of dividing one channel into a transmission slot and a reception slot with respect to time and performing time-divided transmission and reception of data during such slots respectively. The transmitter-receiver includes a transmitting circuit having the capacity to generate a carrier signal; a receiving circuit having an oscillator to generate an oscillation signal for converting a received signal into a predetermined intermediate frequency signal, and a mixer to mix the received signal with the oscillation signal; a signal line for supplying a leakage signal in the transmitting circuit to the receiving circuit; a frequency discriminator for converting into a voltage the frequency of the intermediate frequency signal obtained from the receiving circuit; a device for storing the voltage therein; and circuitry for controlling the oscillation frequency of the oscillator in accordance with the voltage. Since the frequency oscillation is controlled in conformity with the reference voltage, an exact AFC action can be executed under any environmental conditions. | ||||||
| 56 | Tuner for communications equipment | US575522 | 1984-01-31 | US4590611A | 1986-05-20 | Gerhard Maier; Joachim Lange |
| An tuner unit is provided for communications receivers with automatic self-balancing of the individual high frequency filter circuits. An assigned frequency applied to the desired receiver channel is fed to the antenna input during the automatic balancing process. The voltage of this assigned frequency picked up at the output of the filter circuits changes according to a stepwise increase of a tuning voltage controlled by a microprocessor. The tuning voltage is applied to the filter circuit to be balanced via a digital-analog converter and via a switching means controlled by the microprocessor. The automatic balancing is provided by switching the switching means successively to connect to the individual filter sections. | ||||||
| 57 | Digital frequency lock tuning system | US10408 | 1979-02-08 | US4476584A | 1984-10-09 | Charles L. Dages |
| A tuning system for use in radio frequency multi-signal receiving systems, e.g a CATV converter, utilizes a closed feedback loop digital arrangement for channel selection (local oscillator frequency control) and channel fine tuning. The system may be implemented either via discrete hardware or through the use of microprocessor controlled apparatus. | ||||||
| 58 | Mechanical tuner with microphonics elimination circuitry | US191970 | 1980-09-29 | US4392254A | 1983-07-05 | Lawrence M. Ecklund |
| A mechanical radio receiver tuner with microphonics elimination circuitry is disclosed. During a mechanical tuning mode, the mechanical position of a movable tuning element provides an associated adjustable reactance which determines a control voltage for controlling the output of a voltage controlled oscillator (VCO) that serves as the local oscillator for a superheterodyne radio receiver. After initially selecting a channel frequency by adjusting the output of the VCO with the mechanically movable tuning element in the tuning mode, a switch means disconnects the movable tuning element from operative control of the local oscillator frequency and implements a locked tuning mode by providing the VCO with a control voltage related to the difference between the frequency of the output signal of a mixer stage and the center frequency of a fixed tuned narrow passband IF stage that follows the mixer. Preferably, this control voltage for the locked tuning mode is provided by a phase locked loop. When substantial changes in the reactance provided by the movable tuning element are sensed, the switching circuit reimplements the tuning mode so that the position of the mechanically movable element will once again control the output of the local oscillator. In this manner, minor changes in the mechanical position of the movable tuning element during the locked tuning mode have no effect on receiver tuning and therefore microphonics are substantially eliminated. | ||||||
| 59 | Receiver including a tuning circuit having a transmitter search | US5121 | 1979-01-22 | US4253194A | 1981-02-24 | Theodorus H. Van Deursen |
| A receiver scanning circuit features a grouping of the stored frequencies, such as by geographical area or program content. Thus only one kind of station from a selected group need by stopped at, if only that kind of group is desired to be received. This greatly increases operator convenience. | ||||||
| 60 | Channel selection voltage generator | US968260 | 1978-12-11 | US4240115A | 1980-12-16 | Masanori Kamiya |
| A channel selection voltage generator comprises a tuning voltage generator circuit having a capacitor for supplying a tuning voltage to an electronic tuner, a first constant current source for constantly discharging the capacitor at a first constant current and a second constant current source adapted to be rendered selectively in an operative state and in an inoperative state for selectively charging the capacitor at a second constant current which is higher than the first constant current, a frequency discrimination circuit for producing a discrimination signal representative of the amount of frequency deviation when a tuning voltage deviates from a receiving frequency, a buffer circuit for producing a binary "1" level signal when the discrimination signal is higher than a predetermined value and producing a binary "0" level signal when the discrimination signal is lower than the predetermined value, and a control circuit for causing the second constant current source to assume the inoperative state when the binary signal is at "0" level and causing the second constant current source to assume the operative state when the binary signal is at "0" level, the control circuit serving to maintain the second constant current source in the operative state or the inoperative state irrespective of the level of the binary signal during the frequency sweep. | ||||||
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