Class / Patent application number | Description | Number of patent applications / Date published |
455131000 | Frequency conversion between signal source (e.g., wave collector) and receiver | 28 |
20080200136 | Methods and apparatus for baseband digital spectrum translation (BDST) - 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. The method also includes generating, in the baseband digital spectrum translator, a speaker audio signal using the baseband receive signal. | 08-21-2008 |
20080233906 | FREQUENCY CONVERTER, RADIO RECEIVER - 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. | 09-25-2008 |
20090042523 | Multi-media Data Processing Method - 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. | 02-12-2009 |
20090054021 | RECEIVER - 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. | 02-26-2009 |
20090111402 | RECEIVING CIRCUIT AND TIMEPIECE - In a receiving circuit | 04-30-2009 |
20090163159 | Radio receiver, audio system, and method of manufacturing radio receiver - 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. | 06-25-2009 |
20090325518 | Methods and Apparatus for Suppressing Strong-Signal Interference in Low-IF Receivers - 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. In some embodiments, the scaling factor is determined by correlating the sampled signal of interest with the sampled distortion signal. | 12-31-2009 |
20100075621 | RECEIVING APPARATUS - 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. | 03-25-2010 |
20100130146 | DOWN CONVERSION FILTER AND COMMUNICATION RECEIVING APPARATUS - 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. | 05-27-2010 |
20100159858 | Strong Signal Tolerant OFDM Receiver and Receiving Methods - 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. For a selected number of frequency channels, the sampled distortion signal for a frequency channel is scaled, and subtracted from the corresponding sampled signal of interest for the same frequency channel to obtain reduced-interference signal samples for the frequency channel. | 06-24-2010 |
20100159859 | METHOD AND SYSTEM FOR FREQUENCY CONTROL IN A FREQUENCY SHIFTING REPEATER - 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. | 06-24-2010 |
20100184394 | Simplified high frequency tuner and tuning method - 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. | 07-22-2010 |
20110070851 | RADIO-SYNCHRONOUS SIGNAL RECEIVER FOR ADJUSTING A TIME BASE, AND METHOD FOR ACTIVATING THE RECEIVER - The receiver ( | 03-24-2011 |
20110070852 | BROADBAND MULTI-CHANNEL RADIOFREQUENCY RECEIVER - The invention relates to a device for receiving a broadband multi-channel radiofrequency signal, consisting of a radiofrequency analog input stage ( | 03-24-2011 |
20110105066 | FREQUENCY CONVERTER CIRCUIT AND RECEIVING APPARATUS - A frequency converter circuit which multiplies a received signal which is a radio frequency signal by a locally-generated signal and extracts a signal including a frequency corresponding to a difference between the harmonic of the locally-generated signal and the frequency of the radio frequency signal, includes: a mixer section that multiplies the received signal by the locally-generated signal; a timing signal generation section that generates a timing signal synchronized with the locally-generated signal; a sample-and-hold section that samples and holds an output signal of the mixer section according to the timing signal; and a filter section that extracts, from an output signal of the sample-and-hold section, a signal component including the frequency corresponding to the difference between the harmonic of the locally-generated signal and the frequency of the radio frequency signal. | 05-05-2011 |
20110212697 | ANTENNA - A miniature variable-beam microwave antenna ( | 09-01-2011 |
20110237212 | RADIO RECEIVING CIRCUIT - According to one embodiment, a radio receiving circuit includes a low-noise amplifier, a frequency conversion circuit, a capacitor interposed between the low-noise amplifier and the frequency conversion circuit, and an operational amplifier that includes a feedback resistor and amplifies a baseband signal. The gains in the frequency conversion circuit and the operational amplifier are kept constant irrespective of the level of a local oscillation frequency input to the frequency conversion circuit. | 09-29-2011 |
20110244818 | RECEIVER - A receiver | 10-06-2011 |
20120064850 | Harmonic rejection mixer and phase adjustment method thereof - A harmonic rejection mixer converts a frequency of a radio frequency signal by using a first to a third local signals (LOs) whose phases are different from each other, and the harmonic rejection mixer includes a phase difference detection circuit for detecting a phase difference between the first LO and the second LO, a phase difference detection circuit for detecting a phase difference between the first LO and the third LO, a phase adjustment circuit for adjusting the phase of the second LO so that the phase difference detected by the phase difference detection circuit becomes a first phase difference, and a phase adjustment circuit for adjusting the phase of the third LO so that the phase difference detected by the phase difference detection circuit becomes a second phase difference. It is thereby possible to achieve high precision harmonic rejection characteristics. | 03-15-2012 |
20120149317 | Communication Signal Transmission Method, Device and System - A method, device, and system for communication signal transmission are provided, which relate to the field of communications, so as to improve reception performance of the network. The method includes dividing, by a multi-frequency receiver, Radio Frequency (RF) signals by frequency bands received from an antenna to obtain RF signals of different frequency bands; sending a first group of RF signals of a predetermined frequency band to an RF unit so that the RF unit converts the received first group of the RF signals of the predetermined frequency band into first baseband digital signals and sends the first baseband digital signals to a baseband processing unit; and converting a second group of the RF signals of the predetermined frequency band into second baseband digital signals and sending the second baseband digital signals to the baseband processing unit by using a digital baseband interface | 06-14-2012 |
20120178391 | ADJUSTABLE CIRCUIT ARCHITECTURE - An amplifier circuitry having adjustable parameters is presented. The present amplifier circuitry includes a feed-back loop, wherein the feedback loop converts ( | 07-12-2012 |
20120208480 | Adaptive Antenna Module In Active IC Package - An antenna module embeds front end circuitry with an antenna. Adaptive matching circuitry external to the antenna module is electrically connected between the embedded front end circuitry and the embedded antenna. | 08-16-2012 |
20120252387 | Low Power, Low Mass, Modular, Multi-Band Software-Defined Radios - Methods and systems to implement and operate software-defined radios (SDRs). An SDR may be configured to perform a combination of fractional and integer frequency synthesis and direct digital synthesis under control of a digital signal processor, which may provide a set of relatively agile, flexible, low-noise, and low spurious, timing and frequency conversion signals, and which may be used to maintain a transmit path coherent with a receive path. Frequency synthesis may include dithering to provide additional precision. The SDR may include task-specific software-configurable systems to perform tasks in accordance with software-defined parameters or personalities. The SDR may include a hardware interface system to control hardware components, and a host interface system to provide an interface to the SDR with respect to a host system. The SDR may be configured for one or more of communications, navigation, radio science, and sensors. | 10-04-2012 |
20120289176 | Mobile Communications Radio Receiver for Multiple Network Operation - A mobile communications radio receiver for multiple radio network operation includes an RF unit for generating a first down-converted signal from a radio signal received from a first radio network and a second down-converted signal from a radio signal received from a second radio network. Further, the receiver includes a first receiving unit including a user data channel demodulator configured to demodulate a dedicated user data physical channel and a control channel demodulator configured to demodulate a common control data channel of the first radio network based on the first down-converted signal. Still further, the receiver includes a second receiving unit including a pilot channel demodulator configured to demodulate a pilot channel of the second radio network based on the second down-converted signal. A first data connection is configured to couple control data contained in the second down-converted signal to the control channel demodulator of the first receiving unit. | 11-15-2012 |
20130203368 | Method and System for a Baseband Cross-Bar - Methods and systems for a baseband cross-bar may comprise receiving one or more radio frequency (RF) signals in a wireless communication device via antennas coupled to a plurality of receiver paths in the wireless device. The received RF signals may be converted to baseband frequencies. One or more of the down-converted signals may be coupled to receiver paths utilizing a baseband cross-bar. The baseband cross-bar may comprise a plurality of switches, which may comprise CMOS transistors. In-phase and quadrature signals may be processed in the one or more of the plurality of receiver paths. The one or more RF signals comprise cellular signals and/or global navigation satellite signals. A single-ended received RF signal may be converted to a differential signal in one or more of the plurality of receiver paths. The baseband cross-bar may be controlled utilizing a reduced instruction set computing (RISC) processor. | 08-08-2013 |
20140045443 | Blocker-Tolerant Wideband Noise-Canceling Receivers - Because of associated disadvantages of narrow-band off-chip radio-frequency (RF) filtering, a mixer-first receiver front-end designed to tolerate blockers with minimal gain compression and noise factor degradation is disclosed. The mixer-first receiver front-end includes two separate down-conversion paths that help to minimize added noise and voltage gain prior to baseband filtering, which are critical factors in eliminating narrow-band off-chip RF filtering. | 02-13-2014 |
20150011170 | APPARATUS AND METHODS OF ACCESSING ALL CHANNELS OF A SUPERHETERODYNE RECEIVER SIMULTANEOUSLY - An apparatus and method associated with exploiting a characteristic in super-heterodyne receivers such that a modulated signal will be received on all channels simultaneously regardless of the channel selected on the receiver. | 01-08-2015 |
20160043757 | Blocker-Tolerant Wideband Noise-Canceling Receivers - Because of associated disadvantages of narrow-band off-chip radio-frequency (RF) filtering, a mixer-first receiver front-end designed to tolerate blockers with minimal gain compression and noise factor degradation is disclosed. The mixer-first receiver front-end includes two separate down-conversion paths that help to minimize added noise and voltage gain prior to baseband filtering, which are critical factors in eliminating narrow-band off-chip RF filtering. | 02-11-2016 |