Frequency Conversion Between Signal Source (e.g., Wave Collector) And Receiver Patents (Class 455/131)
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Publication number: 20110070852Abstract: The invention relates to a device for receiving a broadband multi-channel radiofrequency signal, consisting of a radiofrequency analog input stage (3) connected to an intermediate-frequency conversion stage (?), said conversion stage comprising at least one conversion chain (13, 15) comprising a frequency mixer (17, 19) that transposes the signal to an intermediate frequency connected to the input of an analog-digital converter (29, 31) with a high frequency sampling rate, characterized in that the intermediate and sampling frequencies in each conversion chain are selected such that, considering the noise generated by the sampling overtones of the corresponding analog-digital converter, each of the radiofrequency signal channels has a signal/noise ratio that is greater at output than a predetermined value of at least one conversion chain.Type: ApplicationFiled: March 17, 2009Publication date: March 24, 2011Applicant: EADS SECURE NETWORKSInventors: BenoƮt Clement, Gilles Latouche, Olivier Muller
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Patent number: 7890078Abstract: A dual band WLAN (Wireless Local Area Network) communications technique is provided where a frequency synthesizer unit generates an LO (Local Oscillator) signal at a frequency between both frequency bands and two downconversion units and/or two upconversion units are provided. One of the units performs conversion between the LO signal and an IF (Intermediate Frequency) signal while the other conversion takes place between the IF signal and a zero-IF or low-IF signal. Signal processing is performed on the zero-IF or low-IF signal.Type: GrantFiled: January 25, 2010Date of Patent: February 15, 2011Assignee: Advanced Micro Devices, Inc.Inventors: Wolfram Kluge, Sascha Beyer, Jeannette Zarbock
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Patent number: 7881692Abstract: An integrated low-IF (low intermediate frequency) terrestrial broadcast receiver and associated method are disclosed that provide an advantageous and cost-efficient solution. The integrated receiver includes a mixer, local oscillator generation circuitry, low-IF conversion circuitry, and DSP circuitry. And the integrated receiver is particularly suited for small, portable devices and the reception of terrestrial audio broadcasts, such as FM and AM terrestrial audio broadcast, in such portable devices.Type: GrantFiled: September 14, 2007Date of Patent: February 1, 2011Assignee: Silicon Laboratories Inc.Inventors: G. Tyson Tuttle, Dan B. Kasha
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Patent number: 7881684Abstract: In a system for measuring a time difference of arrival of signals for positioning, an accurate time difference is measured by a receiver which is reduced in power consumption, size, and cost. The system comprises a node (under measurement) for transmitting a positioning signal, a reference station for transmitting a reference signal, and a plurality of access points for receiving the positioning signal and reference signal, and a server connected to the plurality of access points through a network. Each of the plurality of access points measures a time difference between the reception of the positioning signal and the reception of the reference signal, and a frequency deviation from the reference station, using a clock signal and a signal for shifting the clock signal, and the server calculates the position of the node based on the measured time difference and frequency deviation.Type: GrantFiled: February 17, 2006Date of Patent: February 1, 2011Assignee: Hitachi, Ltd.Inventors: Tatsuo Nakagawa, Masayuki Miyazaki, Kenichi Mizugaki, Ryosuke Fujiwara
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Patent number: 7856211Abstract: Wireless communications transceivers include a transmitter that is configured to selectively frequency shift and transmit portions of broadband information over multiple non-contiguous narrowband frequency bands/segments, each of which is too narrow to carry the broadband information. A receiver also is configured to receive and selectively frequency shift portions of broadband information from multiple non-contiguous narrowband frequency bands/segments, each of which is too narrow to carry the second broadband information. Broadband information thereby may be transmitted and received in a regulated communications environment, even though a given provider may only be assigned discontinuous frequency bands/segments, none of which is wide enough to carry the entire broadband information.Type: GrantFiled: October 10, 2008Date of Patent: December 21, 2010Assignee: ATC Technologies, LLCInventor: Peter D. Karabinis
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Patent number: 7822395Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N-channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.Type: GrantFiled: March 27, 2007Date of Patent: October 26, 2010Inventors: Pieter van Rooyen, Danie van Wyk
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Patent number: 7809341Abstract: A received low-frequency standard radio wave, which is an amplitude modulation signal, is converted to an intermediate frequency signal Sa, and is output to a detection circuit and an AGC circuit. The detection circuit and AGC circuit generates an RF control signal Sf1 and IF control signal Sf2 from the input intermediate frequency signal Sa, and controls an RF control circuit and IF control circuit by outputting the generated RF control signal Sf1 and IF control signal Sf2 to the RF control circuit and IF control circuit. By this a radio wave reception device can speed up AGC operation.Type: GrantFiled: April 15, 2009Date of Patent: October 5, 2010Assignee: Casio Computer Co., Ltd.Inventor: Kaoru Someya
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Publication number: 20100240330Abstract: A digital signal processing device includes: a memory for coefficient storage including partial memories that dividedly store, for each plurality of bits, a plurality of filter coefficients as divided data; a control unit that outputs, to the memory for coefficient storage, an address signal added with activation/inactivation control information; a CE-signal interrupting unit that transmits the CE signals to the partial memories or interrupts the CE signals based on the activation/inactivation control information; an output selecting unit that is provided in at least a part of the partial memories and selects and outputs, based on the activation/inactivation control information, an output of the partial memory or all-bit zero value; a multiplier that performs multiplication of each of a plurality of input data and each of the filter coefficients including the output of the output selecting unit; and an integration circuit system that integrates multiplication results output from the multiplier.Type: ApplicationFiled: March 10, 2010Publication date: September 23, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Toshio Fujisawa
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Patent number: 7796577Abstract: The present invention provides a method for designing operation schedules of a fast Fourier transform (FFT) and a multiple input multiple output orthogonal frequency division multiplexing modem (MIMO-OFDM modem) thereof. According to the present invention, an operation speed of an FFT operator is set up, a receiving symbol is arranged in an OFDM symbol duration in an FFT after receiving the symbol, a transmitting symbol is arranged in an OFDM symbol duration in the FFT schedule before transmitting the symbol, a transmitting/receiving symbol which has the same timing is inserted into an idle symbol duration of the FFT schedule, an FFT schedule which is good to be deleted is deleted, and symbols of the deleted FFT schedule are re-arranged in order to not have an error occur in transmitting/receiving timing.Type: GrantFiled: November 22, 2005Date of Patent: September 14, 2010Assignees: Electronics and Telecommunications Research Institute, Samsung Electronics Co., Ltd., KT Corporation, SK Telecom Co., Ltd, KTFreetel Co., Ltd., Hanaro Telecom, Inc.Inventors: Jun-Woo Kim, Jae-Gun Jung, Youn-Ok Park
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Patent number: 7783271Abstract: A method and apparatus for receiving a radio frequency signal and a method and apparatus for transmitting a modulation signal in a multiple channel radio system. The method for receiving the radio frequency signal involves mixing the radio frequency signal with a demodulating signal, tunable in frequency steps greater than the channel spacing of the multiple channel radio system to facilitate rapid frequency adjustments. The resultant intermediate signal is then mixed with another demodulating signal, tunable in relatively smaller frequency steps in order to select the channel containing the radio frequency signal.Type: GrantFiled: July 10, 2001Date of Patent: August 24, 2010Assignee: QUALCOMM, IncorporatedInventor: John A. Samuels
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Publication number: 20100184394Abstract: A disclosed method tunes a signal from a channelized spectrum having a predetermined channel spacing. A signal of interest having a predetermined maximum bandwidth is mixed with a local oscillator signal, which has a frequency that is an integer multiple of the channel spacing or one-half of a channel spacing displaced from an integer multiple of the channel spacing. The local oscillator signal is selected to frequency translate the signal of interest to within a near-baseband passband whose lower edge is spaced from DC by at least about the maximum bandwidth of the signal of interest. Problems associated with 1/f noise, DC offsets, and self-mixing products are avoided or substantially diminished. Other methods and systems are also disclosed.Type: ApplicationFiled: March 30, 2010Publication date: July 22, 2010Inventor: Edwin A. Suominen
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Publication number: 20100159858Abstract: Circuits and methods are disclosed for compensating for received signal distortion caused by non-linearities in wideband receivers. An exemplary receiver includes a distortion waveform generator configured to approximate non-linear response characteristics of a downconverter circuit used to downconvert the received radio frequency signal. The resulting estimated distortion waveform is filtered, using filter(s) substantially similar to those used for filtering an intermediate frequency signal that includes the desired signal and non-linear distortion products caused by strong interfering signals. The filtered estimated distortion waveform and intermediate frequency signal are sampled, to obtain a sampled distortion signal and a sampled signal of interest. The sampled distortion signal and the sampled signal of interest are divided into a plurality of frequency channels.Type: ApplicationFiled: December 19, 2008Publication date: June 24, 2010Inventors: Paul Wilkinson Dent, Sven Mattisson
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Publication number: 20100159859Abstract: Aspects of a method and system for frequency control in a frequency shifting repeater are provided. In this regard, a reference frequency may be divided to generate a first pair of local oscillator (LO) signals, the first pair of LO signals may be divided to generate a second pair of LO signals. The two pairs of LO signals may be utilized to frequency shift a received signal for repeating the signal on a different frequency. The frequency shifted signal may be generated by down-converting the received signal utilizing the first pair of LO signals, up-converting the down-converted signal utilizing the second pair of LO signals, and combining the resulting up-converted signals. The reference frequency may be divided by a first scaling factor to generate the first pair of LO signal which, in turn, may be divided by a second scaling factor to generate the second pair of LO signals.Type: ApplicationFiled: January 5, 2009Publication date: June 24, 2010Inventor: Ahmadreza Rofougaran
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Publication number: 20100130146Abstract: A down-conversion filter is provided, using first and second input terminals to receive signals that are differentially outputted by a preceding circuit, and using an output terminal to output a down-converted and filtered signal. An output capacitor is coupled to the output terminal. A first switched-capacitor network is arranged between the first input terminal and the output terminal. A second switched-capacitor network is arranged between the second input terminal and the output terminal. Each switched-capacitor network has capacitors, charging switches and charge-summing switches. The charging switches are designed to alternatively couple the capacitors to the first (or second) input terminal. The charge-summing switches are designed to couple the capacitors to the output terminal.Type: ApplicationFiled: April 10, 2009Publication date: May 27, 2010Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTEInventor: Ming-Feng Huang
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Patent number: 7720178Abstract: A method of direct RF digitization for multiple RF signal bands such GNSS or wireless communication signal bands and a receiver using the method. By using the method, an optimal sampling frequency to be used in direct RF digitization for signals of multiple RF signal bands can be easily obtained. According to the present invention, one or more of the RF signal bands are selected to be shifted to target band(s). By doing so, the optimal sampling frequency can be easily calculated. Then the obtained sampling frequency is used in executing the direct RF digitization.Type: GrantFiled: August 11, 2006Date of Patent: May 18, 2010Assignee: MEDIATEK Inc.Inventors: Kuan-i Li, Jui-Ming Wei, Chun-nan Chen
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Publication number: 20100120377Abstract: The present invention relates to a mixer circuit and method of frequency transformation, wherein an input signal is switched in accordance with a first local oscillator signal and in accordance with at least one second local oscillator signal having a smaller duty cycle than said first local oscillator signal, or having a respective predetermined phase shift with respect to said first local oscillator signal. Output signals obtained by the switching in accordance with the first and at least one second local oscillator signals are summed and the polarity of one of said first local oscillator signal and said at least one second local oscillator signal is switched in response to a control input, to thereby switch between a harmonic-rejection mode and a sub-harmonic mixing mode.Type: ApplicationFiled: May 8, 2008Publication date: May 13, 2010Applicant: NXP B.V.Inventor: Xin He
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Patent number: 7715789Abstract: Method affecting the interior of human flesh, providing modulated power signal to at least one solenoid to create a modulated solenoid action delivered through a mechanical interface to the human flesh to create a modulated audio effect into the interior. Providing the modulated power signal may include receiving an audio signal to create the modulated power signal, which may include fetching a down-converted audio signal and the audio signal from a memory device and/or frequency-down-converting the audio signal to create the down-converted audio signal. Receiving the audio signal may further include solenoid amplifying the down-converted signal to create the modulated power signal. The modulated audio effect into the interior of the human flesh, the modulated power signal and the down-converted audio signal are products of this method. Apparatus implementing the solenoid amplifying, receiving the audio signal, frequency-down-converting the audio signal in a variety of configurations.Type: GrantFiled: January 20, 2006Date of Patent: May 11, 2010Assignee: Song ParkInventors: Song Park, Earle Jennings, Robert Spence, John Larsen
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Patent number: 7710345Abstract: Devices and methods are provided to enhance magnetic field communication. One aspect of the present subject matter relates to a method for transmitting and receiving signals using an antenna element electrically connected to a driver and an amplifier. According to various embodiments of the method, a first signal is transmitted from the antenna element and a second signal that was induced in the antenna element is received. Transmitting the first signal includes driving the first signal through the antenna element using the driver, and monitoring the first signal through an input impedance of the amplifier. Receiving the second signal includes reducing the input impedance of the amplifier, and receiving the second signal at the amplifier through the reduced input impedance. Various embodiments shield the antenna element from electric and electromagnetic fields. Other aspects are provided herein.Type: GrantFiled: March 19, 2008Date of Patent: May 4, 2010Assignee: Starkey Laboratories, Inc.Inventor: John David Terry
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Patent number: 7702033Abstract: An encoder encodes sound data and the like to generate a binary signal. A mapper converts the binary signal into a four-level symbol and outputs the four-level symbol. A base band filter includes a root raised cosine filter and a sinc filter. The base band filter blocks a predetermined frequency component of a symbol to shape the symbol into a waveform signal and outputs the waveform signal shaped. An FM modulator transmits a signal subjected to FM modulation according to a magnitude of an amplitude of a waveform signal to a receiving unit. When a symbol of Ā±3 is outputted from the mapper, a frequency shift of a signal transmitted from the FM modulator has a predetermined value in a range of 0.822 [kHz] to 0.952 [kHz]. This makes it possible to provide a modulating apparatus, a mobile communication system, a modulating method, and a communication method that use a modulating method that can conform to the FCC rule to be enforced in 2005 without using a linear power amplifier.Type: GrantFiled: November 2, 2004Date of Patent: April 20, 2010Assignee: Kabushiki Kaisha KenwoodInventor: Masaru Taniguchi
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Patent number: 7697574Abstract: The present invention provides a radio communication device, a transmitter and a receiver capable of handling a plurality of signal waves. A radio communication device has a millimeter-wave transmitter (15) and a millimeter-wave receiver (29). Millimeter-wave transmitter (15) includes a multiplexing circuit (1), a millimeter-wave up-converter (4) and an antenna (3), and the millimeter-receiver includes an antenna (31), a millimeter-wave down-converter (32) and an output processing circuit (45). The signal waves dedicated to the user are modulated by a modulation circuit (121 to 124) so as to be allocated between the ground broadcast waves and satellite broadcast waves. The frequencies are multiplexed in an intermediate frequency band, after that, the multiplexed frequencies are converted into a millimeter-wave band and the resultant is transmitted. On the reception side, the multiplexed waves are down-converted, separated to signal waves and demodulated.Type: GrantFiled: October 17, 2001Date of Patent: April 13, 2010Assignees: Sharp Kabushiki Kaisha, National Institute of Information and Communications TechnologyInventors: Eiji Suematsu, Hiroyo Ogawa, Kiyoshi Hamaguchi, Yozo Shoji
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Publication number: 20100075621Abstract: A receiving apparatus includes: a frequency conversion portion that has at least a mixer that down-converts a frequency of a reception radio-frequency signal by mixing the radio-frequency signal and an output from a voltage-controlled oscillator and outputs the down-converted radio-frequency signal; and a resistor element that has a resistance value to set a DC bias voltage of an input transistor in the mixer to which the radio-frequency signal is inputted to a center value of a dynamic range.Type: ApplicationFiled: September 23, 2009Publication date: March 25, 2010Inventor: Toshikazu Yoshida
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Patent number: 7680282Abstract: A signal processing circuit is configured by connecting a plurality of basic circuits connected in series, each of the basic circuits comprising an arithmetic circuit subjecting a first input signal and a second input signal to a signal processing; a first selection circuit outputting the first input signal or an output signal of the arithmetic circuit; and a second selection circuit outputting the second input signal or an output signal of the arithmetic circuit, so as to make it possible to change operations of the circuit as a whole by properly making a selection on which signal should be output with the aid of the first and second selection circuits, and to execute different signal processing on a single circuit depending on the selection.Type: GrantFiled: September 20, 2004Date of Patent: March 16, 2010Assignee: Fujitsu LimitedInventors: Naoki Odate, Katsuhiro Yoda
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Patent number: 7653145Abstract: Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal generator, a demodulation/modulation facilitation module, and a MAC interface. The WLAN receiver includes at least one universal frequency translation module that frequency down-converts a received EM signal. In embodiments, the UFT based receiver is configured in a multi-phase embodiment to reduce or eliminate re-radiation that is caused by DC offset. The WLAN transmitter includes at least one universal frequency translation module that frequency up-converts a baseband signal in preparation for transmission over the wireless LAN. In embodiments, the UFT based transmitter is configured in a differential and multi-phase embodiment to reduce carrier insertion and spectral growth.Type: GrantFiled: January 25, 2005Date of Patent: January 26, 2010Assignee: ParkerVision, Inc.Inventors: David F. Sorrells, Michael J. Bultman, Robert W. Cook, Richard C. Looke, Charley D. Moses, Jr., Gregory S. Rawlins, Michael W. Rawlins
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Patent number: 7643380Abstract: A receiving circuit is provided with an amplifier circuit for amplifying the electric signal received by an antenna circuit, a frequency converter/detector circuit for converting a frequency of the electric signal amplified by the amplifier circuit to acquire an intermediate frequency signal, and for detecting the intermediate frequency signal to acquire a demodulated signal, and a filter circuit for removing an intermediate frequency component from the demodulated signal acquired by the frequency converter/detector circuit.Type: GrantFiled: July 23, 2007Date of Patent: January 5, 2010Assignee: Casio Computer Co., Ltd.Inventor: Kaoru Someya
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Publication number: 20090325518Abstract: Circuits and methods are disclosed for compensating for received signal distortion caused by non-linearities in the receiver circuitry. An exemplary receiver circuit includes a distortion waveform generator configured to approximate one or more non-linear response characteristics of a downconverter circuit used to downconvert the received radio frequency signal. The estimated distortion waveform thus produced is filtered, using a filter or filters substantially similar to those used for filtering an intermediate frequency signal that includes the desired signal and non-linear distortion products caused by strong interfering signals. The filtered estimated distortion waveform and the intermediate frequency are sampled, to obtain a sampled distortion signal and a sampled signal of interest. The sampled distortion signal is scaled, and subtracted from the sampled signal of interest to obtain reduced-interference signal samples.Type: ApplicationFiled: June 27, 2008Publication date: December 31, 2009Inventors: Sven Mattisson, Paul Wilkinson Dent
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Patent number: 7634225Abstract: The present invention provides a receiver that includes a plurality of tuners for receiving broadcasts such as satellite broadcast. A tuner circuit (1) includes an input terminal (11) for inputting a broadcast wave in which a video signal and/or an audio signal are modulated in a predetermined format, and a mount layer (13) on which a main circuit (12) for selecting, from the broadcast wave, a video signal and/or an audio signal included in a predetermined frequency band is mounted. In the tuner circuit (1), a first ground layer (15) is disposed, through a first dielectric layer (14), on the surface opposite to that on which the main circuit (12) of the mount layer (13) is arranged, and a second ground layer (17) is disposed through a second dielectric layer, thereby suppressing mutual interference between tuners.Type: GrantFiled: April 2, 2003Date of Patent: December 15, 2009Assignee: Sony CorporationInventors: Satoru Kawakami, Tadashi Imai
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Patent number: 7606537Abstract: A system and method of encoding and transmitting data includes a data receiver/carrier transmitter which transmits a sinusoidal carrier signal to a data source/carrier receiver. The data source encodes at least one transmission channel during a corresponding period. The carrier is reflected back to the data receiver with an amplitude proportional to the degree of applied impedance such that the total amplitude of the transmitted and reflected cycles represents encoded data, yet the underlying carrier signal remains an un-modulated sinusoid.Type: GrantFiled: September 3, 2004Date of Patent: October 20, 2009Inventor: Colin Dugald Brodhead
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Publication number: 20090186581Abstract: An improved accessory for an electronic device that allows the device to interface with a standard radio receiver or another electronic device using an incompatible digital transmission format. The accessory includes a digital transceiver for establishing digital communications with a first remote device having a digital transceiver. The accessory receives audio data from the device over the digital wireless channel and produces an FM broadcast output signal based upon the received digital audio data. Thus, music from a personal computer or digital music player can be listened to over a standard radio receiver. The accessory can also be configured to produce a Wi-Fi or Bluetooth formatted output such that the audio data can be transmitted to a previously incompatible radio or headphone receiver. The user inputs of the portable electronic device can preferably be used to control functions of the accessory and the device's display to display the selected transmission frequency or channel of the accessory.Type: ApplicationFiled: January 15, 2009Publication date: July 23, 2009Inventors: Paul P. Griffin, JR., Robert St. Clair Donovan
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Publication number: 20090163159Abstract: A radio receiver includes a frequency converter, an oscillation circuit, an A/D converter, and a digital demodulator. The A/D converter digitally samples the intermediate frequency signal by using one of an oscillating frequency, a multiplying frequency, and a dividing frequency of the clock signal as a sampling frequency. The digital demodulator performs a digital demodulation processing by using the intermediate frequency signal digitally sampled and by using the one of the oscillating frequency, the multiplying frequency, and the dividing frequency of the clock signal as an operating frequency. The oscillating frequency is within a predetermined range. The predetermined range is at least one of equal to or more than 37.1 MHz and less than or equal to 37.9 MHz, equal to or more than 54.1 MHz and less than or equal to 64.8 MHz, and equal to or more than 74.2 MHz and less than or equal to 75.8 MHz.Type: ApplicationFiled: December 17, 2008Publication date: June 25, 2009Applicant: NEC Electronics CorporationInventor: Yasushi Ooi
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Patent number: 7542729Abstract: At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. Furthermore, a communication system based on an OFDM system is utilized for data transmission of a plurality of subchannels, wherein the subchannels are differentiated by changing the length of a guard time slot or a carrier wave interval of a symbol transmission time slot, or changing the transmission electric power of the carrier.Type: GrantFiled: October 5, 2007Date of Patent: June 2, 2009Assignee: Panasonic CorporationInventor: Mitsuaki Oshima
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Patent number: 7536203Abstract: A portable memory device and method comprises a data storage component; and a wireless receiver operatively connected to the data storage component, wherein the wireless receiver is adapted to receive mobile TV signals. The portable memory device further comprises an interface component adapted to connect to a host computing device. The wireless receiver is adapted to receive radio signals. The wireless receiver is adapted to receive satellite signals. The wireless receiver comprises an antenna; a matching network operatively connected to the antenna; and a radio frequency (RF) receiver chip operatively connected to the matching network. The portable memory device further comprises a demodulator operatively connected to (or integrated in) the RF receiver chip. The data storage component comprises a flash memory unit comprising software code adapted to interface with a host computing device and process data on the host computing device.Type: GrantFiled: March 3, 2006Date of Patent: May 19, 2009Assignee: Newport Media, Inc.Inventors: Hassan Elwan, Adel F. Fanous
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Publication number: 20090111402Abstract: In a receiving circuit 44 for receiving an electromagnetic wave signal, a frequency converter/detector circuit 100 comprises a local oscillator 131 for generating an oscillation signal, plural mixers 133, 134 for mixing the received electromagnetic wave signal with the oscillation signal to generate intermediate frequency signals having different phases, and a signal generating/synthesizing circuit 140 for generating based on the intermediate frequency signals generated by the mixers other intermediate frequency signals which are different in phase from the original intermediate frequency signals, for detecting the intermediate frequency signals and other intermediate frequency signal, and for adding the detected signals together to generate a synthesized signal.Type: ApplicationFiled: October 8, 2008Publication date: April 30, 2009Applicant: Casio Computer Co., Ltd.Inventor: Kaoru SOMEYA
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Patent number: 7522894Abstract: A radio receiving apparatus includes two receiving antennas, two upstream RF amplifiers, a SAW filter having two input IDTs and an output IDT, a downstream RF amplifier, and a detector circuit. The antennas are connected to the respective input IDTs via the respective upstream RF amplifiers. The detector circuit is connected via the downstream RF amplifier to the output IDT, which receives a signal from each of the two input IDTs. The distances from the center of the output IDT to the centers of the input IDTs differ from one another. The SAW filter functions as two band-pass filters, two delay circuits connected to the respective band-pass filters, and a combiner circuit for combining the outputs from the delay circuits.Type: GrantFiled: January 8, 2004Date of Patent: April 21, 2009Assignee: Murata Manufacturing Co., Ltd.Inventors: Akira Kato, Takashi Kawabata
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Patent number: 7519344Abstract: An amplifier has a band pass response. The band pass response may be set by setting corner frequencies of low pass filters.Type: GrantFiled: March 31, 2004Date of Patent: April 14, 2009Assignee: Intel CorporationInventors: Luiz M. Franca-Neto, Stephen S. Pawlowski
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Patent number: 7519100Abstract: A method and device for transmitting data in the form of a series of blocks in which each block of data is subjected to a frequency conversion in order to be transmitted at a carrier frequency. The method includes inserting a sequence of padding data between a first block of data intended to be transmitted at a first carrier frequency and a second block of data intended to be transmitted at a second carrier frequency, and transmitting the padding data while the frequency changes from the first carrier frequency to the second carrier frequency.Type: GrantFiled: April 5, 2002Date of Patent: April 14, 2009Assignee: Mitsubishi Denki Kabushiki KaishaInventor: Luc Rambaud
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Patent number: 7512963Abstract: Disclosed herein is an intelligent low-noise block down-converter (LNB) which is implemented to, only when an LNB ID contained therein is the same as an ID of a satellite receiver connected therewith, provide a down-converted signal (IF signal) to the satellite receiver, thereby making it possible to more securely prevent an ID card of the satellite receiver and/or a pay broadcast program from being duplicated.Type: GrantFiled: November 24, 2004Date of Patent: March 31, 2009Assignee: Samsung Electro-Mechanics Co., Ltd.Inventor: Dong Won Jeon
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Patent number: 7509104Abstract: A double conversion RF tuner includes an up-conversion unit and a down-conversion unit. The up-conversion unit up converts a received radio frequency (RF) signal corresponding to a first frequency band to a first intermediate frequency (IF) signal and up-converts the received RF signal corresponding to a second frequency band higher than the first frequency band to a second IF frequency. The down conversion unit down converts one of the first and second IF signals outputted from the up-conversion unit to a final IF signal.Type: GrantFiled: July 14, 2005Date of Patent: March 24, 2009Assignee: Samsung Electronics Co., Ltd.Inventor: Seung-Hyun Song
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Publication number: 20090054021Abstract: A receiver includes a frequency controller coupled to an input terminal of a sampling signal generator, and the frequency controller controls a frequency of a sampling signal based on a signal supplied from a positional information acquiring section. This structure allows eliminating a detection of an interfering signal, and controlling the frequency of the sampling signal supplied to an AD converter based on the signal from the positional information acquiring section. As a result, the receiver can reduce its power consumption.Type: ApplicationFiled: September 29, 2006Publication date: February 26, 2009Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Eiji Okada, Hiroaki Ozeki
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Publication number: 20090054017Abstract: There is provided a modular amplifier structure that includes a plurality of parallel amplifier sub-units. Each amplifier sub-unit is configured to amplify a received payload signal under control of at least one received control signal. Outputs of the amplifier sub-units are applied to a combining circuit. The combining circuit is configured to combine the outputs of the plurality of amplifier sub-units to provide an amplified payload signal.Type: ApplicationFiled: October 9, 2007Publication date: February 26, 2009Inventor: Sami Vilhonen
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Publication number: 20090042523Abstract: The present invention discloses a multi-media data processing method for use in an integrated circuit having an error correction circuit, the method comprising the steps of: receiving broadcasted analog data; converting the analog data to digital data; and storing the digital data into a main memory without error correction, wherein the digital data stored in the main memory are subject to error correction only when it is required, but are not subject to error correction if it is not required.Type: ApplicationFiled: August 9, 2007Publication date: February 12, 2009Inventors: Chao-Chung Chang, Ming-Feng Yu, Ming-Jun Hsiao, Wei-Hao Yuan, Wei-Cheng Chang Chien
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Publication number: 20080287072Abstract: In one embodiment, the present invention includes a method for receiving an incoming radio frequency (RF) signal in a receiver, estimating a signal-to-noise ratio (SNR) of a constant modulus (CM) signal in the incoming RF signal based on a calculated magnitude of the incoming RF signal, and indicating presence of a modulated signal in the incoming RF signal if the estimated SNR is greater than a threshold.Type: ApplicationFiled: May 16, 2007Publication date: November 20, 2008Inventors: Javier Elenes, Dana Taipale
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Publication number: 20080274703Abstract: Implementations related to circuits including an oscillator and a switch-mode DC/DC converter are presented herein.Type: ApplicationFiled: May 3, 2007Publication date: November 6, 2008Inventor: Zdravko Boos
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Patent number: 7433659Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.Type: GrantFiled: April 2, 2007Date of Patent: October 7, 2008Assignee: Broadcom CorporationInventors: Pieter van Rooyen, Danie van Wyk
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Patent number: 7433660Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.Type: GrantFiled: April 2, 2007Date of Patent: October 7, 2008Assignee: Broadcom CorporationInventors: Pieter van Rooyen, Danie van Wyk
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Publication number: 20080233906Abstract: Disclosed is a frequency converter including: a passive type analog multiplier configured to output a multiplication result in a current; a buffer outputting a buffering current by buffering the current of the multiplication result; and a current-voltage converter current-voltage converting the buffering current. Alternately, disclosed is a frequency converter including: a passive type analog multiplier configured to output a multiplication result in a current; a buffer outputting a buffering current by buffering the current of the multiplication result; and an integrator integrating the buffering current to output a voltage.Type: ApplicationFiled: October 29, 2007Publication date: September 25, 2008Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Toshiya Mitomo, Rui Ito, Asuka Maki
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Publication number: 20080227389Abstract: A radio communication method including, generating a first transmit RF signal and a second transmit RF signal from a data signal to be transmitted, each of the first and second transmit RF signals having a power spectrum in symmetric shape in the frequency domain, transmitting the first transmit RF signal and the second transmit RF signal at a different time, receiving the first transmit RF signal and the second transmit RF signal to generate a first received RF signal and a second received RF signal, and reproducing the data signal from the first received RF signal and the second received RF signal.Type: ApplicationFiled: September 12, 2007Publication date: September 18, 2008Inventors: Ren Sakata, Koji Akita, Koichiro Ban, Noritaka Deguchi
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Publication number: 20080200136Abstract: A method for transmitting and receiving digitally modulated wireless signals using an analog FM transceiver is provided. The analog FM transceiver has a transmit speech audio frequency band, a receive speech audio frequency band substantially equal to the transmit speech audio frequency band, a subaudible frequency band, a direct microphone audio input, and a direct speaker audio output. The method includes generating, in a baseband digital spectrum translator external to the analog FM transceiver, a baseband transmit signal occupying frequencies substantially within the transmit speech audio frequency band of the analog FM transceiver. The method also includes applying the generated baseband transmit signal to the direct microphone audio input to thereby transmit a digitally encoded RF TX signal having a constant envelope and using the analog FM transceiver to receive a digitally encoded RF RX signal with a constant envelope and to generate a baseband receive signal using the digitally encoded RF RX signal.Type: ApplicationFiled: February 20, 2007Publication date: August 21, 2008Inventor: Richard Duane Taylor
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Patent number: 7412218Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.Type: GrantFiled: April 2, 2007Date of Patent: August 12, 2008Assignee: Broadcom CorporationInventors: Pieter van Rooyen, Danie van Wyk
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Patent number: 7398075Abstract: In a radio wave reception device and a radio wave clock capable of receiving multiple frequencies, an intermediate frequency signal whose frequency is fixed can be output while a signal output from a local oscillation circuit (5) is fixed.Type: GrantFiled: August 8, 2003Date of Patent: July 8, 2008Assignee: Casio Computer Co., Ltd.Inventor: Kaoru Someya
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Patent number: 7392025Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.Type: GrantFiled: April 2, 2007Date of Patent: June 24, 2008Assignee: Broadcom CorporationInventors: Pieter van Rooyen, Danie van Wyk