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Signal selection based on frequency (e.g., tuning)

Subclass of:

455 - Telecommunications

455130000 - RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
455179100 Channel or station selection 82
455161100 Frequency scanning 41
455193100 With antenna circuit tuning 22
455188100 Band selection 21
455192100 With frequency control 17
455200100 With other control (e.g., volume, gain, bandwidth, etc.) 12
455196100 Including variation of local oscillator frequency 8
455154100 With indication of frequency, channel, or selector condition (e.g., tuning aid) 8
455160100 Plural tuning modes (e.g., manual and scanning, etc.) 5
20120238228Radio Transmitter and Radio Receiver with Channel Condition Assessment - FM radio transmitter is being widely used in portable devices as a convenient way to output audio contents to ubiquitously available FM radio receivers in cars or homes. However, the signal from the FM radio transmitter may be interfering with the signal being broadcast by an FM radio station. A scan system is incorporated into the FM radio transmitter to quickly and reliably identify a vacant channel for the FM radio transmitter to use. The scan system measures on-channel and out-of-channel signal quality and selects a best channel for transmission based on the measured on-channel and out-of-channel signal quality. The scan system is also incorporated into an FM radio receiver to quickly and reliably tune to a valid channel. The scan system selects the valid channel based on the measured on-channel and out-of-channel signal quality.09-20-2012
20120108191Controlling Power Consumption In A Radio Tuner - According to one aspect of the present invention, a controller is coupled to at least first and second signal processors (at least one of which includes analog demodulation circuitry and another of which includes digital demodulation circuitry). The controller may operate to disable the first signal processor responsive to a control signal that indicates that a second signal (corresponding to a demodulator output) is available from the second signal processor.05-03-2012
20090075611TUNER THAT CONDUCTS CHANNEL SEARCH, AND DIVERSITY RECEPTION SYSTEM INCLUDING SAID TUNER - A tuner includes a first mixer circuit multiplying a first radio signal by a first local oscillation signal corresponding to a selected channel to generate a first baseband signal in a normal mode, and multiplying the first radio signal by a first local oscillation signal corresponding to a channel that is a target of search to generate a first baseband signal in a channel search mode, a second mixer circuit multiplying a second radio signal by a second local oscillation signal corresponding to the selected channel to generate a second baseband signal in the normal mode and the channel search mode, and a combining circuit combining a demodulation signal of the first baseband signal and a demodulation signal of the second baseband signal for output in the normal mode, and to output a demodulation signal of the second baseband signal in the channel search mode.03-19-2009
20110136454Method Of Determining Station Status Of Non-Audible Tuner In Dual-Tuner System - A system and method of visually providing the current status of selected frequencies of particular interest to the user of an entertainment system and in particular, of a vehicle entertainment system.06-09-2011
20120264385DYNAMIC ALTERNATIVE FREQUENCY CHANNEL SWITCHING IN WIRELESS TERMINAL - Provided is a device and method for providing an Alternative Frequency (AF) in a wireless terminal, by which an AF channel service suitable for a user environment can be provided. To this end, the device includes a radio broadcast receiver for receiving a radio broadcast signal, and a controller for attempting an AF channel switch after an elapse of a re-try wait time which is set according to a number of recent AF channel switch failures. The controller may detect the user environment as a walking state or a driving state. If a driving state is detected, the AF channel switch is attempted immediately when receive signal quality is below a threshold, regardless of the number of recent AF channel failures. If a walking state is detected, the AF channel switch is attempted after the elapse of the wait time.10-18-2012
455151100 Remote control of channel or station selection 3
20080261546Method and Apparatus for Controlling Antenna Connectivity as a Function of Antenna Orientation - Methods and apparatuses presented herein control antenna connectivity for a wireless communication device as a function of rotation of a connector assembly plugged into the device, such as where an external antenna or cable includes the connector assembly. Assuming the device has a mating connector for the external antenna that changes the connections of internal and external antennas as a function of the connector mating depth, the method comprises configuring the wireless communication device and/or the external antenna with a mechanical feature that changes the mating depth between the device's and the antenna's mating connectors responsive to external antenna rotation. In one embodiment, a body portion of the external antenna retains the mating connector and includes a cam feature or other mechanical feature that engages an edge or surface of the device as the antenna is rotated, thereby pushing the antenna out from the device.10-23-2008
20090088107METHOD AND SYSTEM FOR UTILIZING UNDERSAMPLING AND/OR A DIGITAL DELAY LINE TO REMOVE OUT-OF-BAND BLOCKER SIGNALS - Methods and systems for wireless communication are disclosed and may include generating first and second signals by band-limiting a received wireless signal in two frequency ranges utilizing programmable bandpass filters. The first and second signals may be undersampled utilizing a clock signal. A delay of the second signal may be coarse-tuned by delaying the undersampling clock signal and may be fine-tuned by delaying the undersampled second signal utilizing a programmable delay line. The delayed, undersampled second signal may be subtracted from the undersampled first signal. A center frequency of the first range may be configured to a desired signal frequency, and a center frequency of the second range may be configured to a blocker signal frequency. The delay line may include an array of CMOS inverters, and may be fine-tuned utilizing programmable capacitors. The bandpass filters may include one or more coplanar waveguide or microstrip bandpass filters.04-02-2009
20120208481REMOTELY CONTROLLING SOUND SYSTEM IN ENCLOSURE - A sound reproducing system having at least a radio and left and right loudspeakers in a base enclosure is free of at least manually selectable volume controlling and radio tuning A remote controller includes at least manually selectable volume and tuning controls.08-16-2012
455195100 Variable voltage or current tuning 2
20080318538Simplified 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.12-25-2008
20120135699SUPERHETERODYNE RECEIVER APPARATUS, SUPERHETERODYNE RECEIVING METHOD AND SEMICONDUCTOR INTEGRATED CIRCUIT FOR SUPERHETERODYNE RECEIVER APPARATUS - A superheterodyne receiver apparatus includes a tuning circuit for selecting and receiving a high frequency signal, the circuit being composed of a voltage-variable capacitance element and an inductance element; and a frequency converting unit for frequency converting the high frequency signal to an intermediate frequency signal. The superheterodyne receiver apparatus further includes an electrically rewritable read only memory; a calculation unit for calculating tuning voltage setting data, which are used to set the tuning circuit to a tuning voltage corresponding to a desired reception frequency, in accordance with a mathematical expression that uses the data stored in the memory as coefficients; and a D/A conversion unit for D/A converting the tuning voltage setting data to the tuning voltage.05-31-2012
455170100 With mechanical or electromechanical selection 1
20100009645Controlling Fine Frequency Changes In An Oscillator - In one embodiment, the present invention includes a method for determining if a frequency control instruction would cause a first capacitor bank to reach a limit and adjusting the first capacitor bank in a first direction using a calibration value and adjusting a second capacitor bank in a second direction if the first capacitor bank would reach the limit. Furthermore, the calibration value may be calculated and stored in accordance with other embodiments. In such manner, small changes in capacitance and correspondingly small changes in frequency may be effected.01-14-2010
Entries
DocumentTitleDate
20100099371AUTOMATIC RADIO TUNING SYSTEM - This invention relates to a system for automatically tuning a radio receiver (04-22-2010
20100323648DEMODULATION DEVICE, RECEPTION DEVICE, AND DEMODULATION METHOD - A device mitigates reduction in reception performance caused by a harmonic component of a clock used for demodulation. The device includes a tuner performing frequency conversion by multiplying a received signal by a signal having a frequency corresponding to a frequency of a desired signal included in the received signal, and outputting the obtained frequency-converted signal; and a demodulation section generating a demodulated signal by demodulating the frequency-converted signal. The demodulation section operates in response to a master clock having a frequency corresponding to the frequency of the desired signal.12-23-2010
20090124224RADIO COMMUNICATION DEVICE, RECEIVER CONTROLLER OF A RADIO COMMUNICATION DEVICE, AND METHOD FOR SEARCHING FOR A RADIO CELL - Embodiments of the invention relate generally to a radio communication device, to a receiver controller of a radio communication device, and to a method for searching for a radio cell. In an embodiment of the invention, a method for searching for a radio cell is provided. The method may include scanning at least one frequency band of a first radio access technology, scanning at least one frequency band of a second radio access technology, wherein the at least one frequency band of the second radio access technology at least partially overlaps with the at least one frequency band of the first radio access technology, wherein at least one frequency sub-band of the first radio access technology is not scanned in the at least one frequency band of the second radio access technology.05-14-2009
20090124225TUNING CIRCUIT AND RADIO RECEIVER USING THE SAME - In a tuning circuit constituted by connecting a coil L and two capacitors C05-14-2009
20090191828METHOD AND SYSTEM FOR FLEXIBLE FM TUNING - A system for processing signals is disclosed and may include a single chip having an integrated Bluetooth radio and an integrated FM radio. The single chip may include at least one processor that enables selecting from a range of FM channels, a particular frequency for one of the FM channels based on an intermediate frequency (IF). The particular frequency may be selected so that it is an integer multiple of a channel spacing between neighboring allocated FM channels within the range of FM channels, and may be offset by at most one-half the channel spacing. The at least one processor may enable determining a frequency error of the selected particular frequency for the one of the FM channels. The at least one processor may also enable determining, whether the particular frequency includes an on-frequency channel based on the determined frequency error.07-30-2009
20090011732Tuning circuitry utilizing frequency translation of an impedance from a fixed-filter frequency response - A circuit and method for tracking a local oscillator signal frequency in an RF tuner, for tuning input RF signals. The RF tuner includes a frequency-dependent impedance generator that generates a frequency-dependent impedance at the input by rejecting unwanted input RF signals and shunt feeding back the desired signal to the input. The desired signal frequency is centered at the local oscillator signal frequency. The frequency-dependent impedance generator is used with an amplifier circuit to generate a tracking amplifier, the frequency-dependent amplifier gain of which tracks the local oscillator signal frequency.01-08-2009
20090311981TUNER MODULE - A tuner module adapted to demodulate a signal received by an antenna device is disclosed. An electric device is mounted on a circuit board. A die-casted chassis is made of a conductive material and monolithically has a tubular part. A signal transmitting member is coaxially disposed in the tubular part and constitutes a coaxial connector with the tubular part. The signal transmitting member is electrically connected to the electric device to transmit the signal received by the antenna device to the electric device.12-17-2009
20120003947Radio-frequency Processing Device and Method and Related Wireless Communication Device - A radio-frequency (RF) processing device, for a wireless communication device, is disclosed. The RF processing device comprises an antenna, an RF-signal processing module, a controller, for generating a control signal according to a band switching signal, and a matching adjustment module for adjusting an impedance between the antenna and the RF-signal processing module according to the control signal.01-05-2012
20090149143METHOD AND APPARATUS FOR SELECTING A RADIO CHANNEL FOR TRANSMITTING AN AUDIO SIGNAL TO A RADIO LOCAL RECEIVER - A transmitter device (06-11-2009
20120034889Sport Event Transducer - A sport event transducer having an output element that can emit a perceivable output in response to an event that relates to a sport team, such as for example by emitting an audio-visual output when a particular football team scores a touchdown. The transducer can be removable attached to a sport garment such as a cap or jersey, or can be an integral part of the garment. A transmission system remotely controls such transducers in response to sport team events by broadcasting an RF signal carrying team event messages, such as for example by transmitting an FM radio-data broadcast that carries a team event message embedded in the FM signal as RDS data. The sport event transducer receives and decodes such RF broadcast signals. If the transducer receives a team event message that relates to the transducer's affiliated team, the transducer's output element emits an audio and/or visual output signal in response to the message.02-09-2012
20090143034Method for Tuning an RF Base-Band Circuit of a Receiver - A tuner for a wireless receiver is provided, which may include an input interface that is adapted to receive wireless signals, a mixer that is adapted to select a specific frequency from signals received at the input interface, and a controllable switch that is adapted to lead an output from the mixer towards a base-band unit of the receiver and to disconnect the output. The tuner may further include a controller which may be adapted to operate the controllable switch to disconnect the output of the mixer when the controller studies characteristics of the tuner and to reconnect the output of the mixer at other times. The studied characteristics may be associated with parasitic direct current voltages in the tuner, which may be associated with a low noise amplifier of the tuner, or programmable gain amplifier of the tuner or with both amplifiers. The controller may cause a compensation direct current voltage to be generated and applied to the mixer's output based on the ratio between programmed gain and actual/measured gain of the programmable gain amplifier.06-04-2009
20090170456COHERENT TUNABLE FILTER APPARATUS AND WIRELESS COMMUNICATION FRONT-END CIRCUIT THEREOF - A front-end circuit with coherent tunable filters is provided. The circuit includes a first filter, an amplifier, and a second filter. The amplifier is coupled to the first filter, and the second filter is coupled to the amplifier. Furthermore, the amplifier is placed between the first and second filters. The first filter has a first tunable intermediate frequency, and is used to filter a received signal. The amplifier is used to amplify the output of the first filter. The second filter has a second tunable intermediate frequency, and is used to filter the output of the amplifier. The first and second intermediate frequencies have a coherent-tuning relation with each other.07-02-2009
20080305757Broadcast Receiver for and Method of Providing Broadcast Channel Information - A broadcast receiver for and a method of providing broadcast channel information in which a broadcast search list is dynamically created and provided to a user, the broadcast receiver including: a tuner unit to tune a broadcast channel from a plurality of broadcast channels and to output a digital broadcast signal of the tuned broadcast channel; a broadcast signal processing unit to receive service information included in the broadcast signal output by the tuner unit; a storage unit to store the received service information and a control unit to dynamically create a broadcast search list based on the service information and to generate a screen providing the broadcast search list. Accordingly, it is possible to dynamically change a broadcast search list that provides search information regarding broadcast channels and to provide a user with the dynamically changed broadcast search list.12-11-2008
20100144293POWER SUPPLY DEVICE, POWER CABLE, AND RECEPTION DEVICE - A power supply device includes: a power supply unit configured to output the power of a mainframe; and a power transmission cable configured to supply the power output from the power supply unit to the mainframe via a connector; with the power transmission cable including a mainframe side high-frequency cutoff portion disposed between the power supply terminal of the connector, a power supply unit side high-frequency cutoff portion, which is disposed on the power supply unit side at a predetermined length from the connector, configured to restrict the length of a portion serving as an antenna, a first transmission line used for power supply to the mainframe via the mainframe side high-frequency cutoff portion, and a second transmission line to be connected to a tuner of the mainframe via the connector.06-10-2010
20120094623BROADBAND RECEIVE ONLY TUNER COMBINED WITH RECEIVE SWITCH - An antenna tuner unit (ATU) that provides broadband tuning is disclosed. The disclosed ATU includes a radio frequency (RF) switch circuit having an N number of switch inputs, wherein N is a natural number equal to 2 or greater. An N number of reactance elements are coupled in series between an RF input and one of the N number of switch inputs. Taps between adjacent pairs of the N number of reactance elements, wherein each of the taps is coupled to a corresponding one of the N number of switch inputs. The ATU further includes a capacitive element for each of the taps, wherein each capacitive element is coupled between a corresponding one of the taps and a voltage node. In at least one embodiment, each of the capacitive elements is made up of a programmable capacitor array.04-19-2012
20080318536Simplified 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.12-25-2008
20090325521Auto-Tuning System for an On-Chip RF Filter - A Radio Frequency Receiver on a Single Integrated Circuit (“RFSIC”) is described. The RFSIC may include a mixer, a phase-locked loop (“PLL”) in signal communication with the mixer, and an on-chip auto-tuned RF filter in signal communication with both the mixer and PPL, such that the same PLL simultaneously tunes the frequency of the VCO and the frequency response of the auto-tuned RF filter.12-31-2009
20110230152SIGNAL PROCESSING APPARATUS HAVING FREQUENCY-SELECTIVE CIRCUIT WITH MIXER MODULE IMPLEMENTED FOR CONTROLLING FREQUENCY RESPONSE AND RELATED METHOD THEREOF - A method of setting filtering characteristic of a signal processing apparatus includes following steps: configuring a first signal processing path, included in the signal processing apparatus and electrically connected to a signal input port of the signal processing apparatus, to have a first filtering characteristic; and configuring a second signal processing path, included in the signal processing apparatus and electrically connected between the signal input port and the first signal processing path, to have a second filtering characteristic different from the first filtering characteristic. When an input signal received at the signal input port includes a first signal component with a first frequency and a second signal component with a second frequency, most of the first signal component is processed by the first signal processing path, and most of the second signal component is processed by the second signal processing path.09-22-2011
20110230151FREQUENCY-SELECTIVE CIRCUIT WITH MIXER MODULE IMPLEMENTED FOR CONTROLLING FREQUENCY RESPONSE, AND RELATED SIGNAL PROCESSING APPARATUS AND METHOD - A frequency-selective circuit includes a signal input port, a signal output port, and a frequency response control block. The frequency response control block includes a mixer module and a filter module. The mixer module has a first port electrically connected to a signal path between the signal input port and the signal output port, a second port electrically connected to the filter module, and a local oscillator (LO) port. The mixer module operates according to an LO input received by the LO port. The filter module is electrically connected to the second port of the mixer module.09-22-2011
20090253391Frequency planning for switching devices for multi-band broadcast radios - Systems and methods are disclosed that use multiple DC-DC (direct-current-to-direct-current) regulators and configurable DC-DC regulators with respect to multi-band audio receivers in order to allow for the use of different DC-DC regulator switching clock signals for different audio broadcast bands. The systems and methods disclosed thereby help to alleviate interference problems typically caused by switching devices used in the DC-DC conversion process. The embodiments described are also applicable to switching power supplies run from alternating current (AC) power sources and to Class D amplifiers working with broadcast radios.10-08-2009
20090258619RADIO DEVICE WITH VIRTUALLY INFINITE SIMULTANEOUS INPUTS - A method, system, media, and apparatus are directed to radio recording. Radio stations are simultaneously recorded based on a radio parameter including a processing parameter, a memory usage or allocation, a recording status, or the like. The radio parameter is adapted for an individual station, some radio stations, or all radio stations. The processing parameter is adapted based on a processor usage. The memory usage is adapted based on a memory requirement of a station being recorded. A station may be suspended from recording based on a loss of a signal and resumed based on a resumption of the signal. An access to a radio content recorded while a signal was available may be provided, if the signal is unavailable. The plurality of stations may be prioritized.10-15-2009
20100167673METHOD AND SYSTEM FOR RF FRONT-END CALIBRATION SCHEME USING FRACTIONAL-N FREQUENCY SYNTHESIZED SIGNALS AND RSSI - Aspects of a method and system for an RF front-end calibration scheme using signals from a fractional-N frequency synthesized and received signal strength indicator (RSSI) are provided. A frequency synthesizer within a wireless receiver may generate a signal for dynamically modifying a gain in an integrated low-noise amplifier (LNA) for each selected receiver channel. The frequency-synthesized signals may be applied to at least one tunable load communicatively coupled to the LNA. The tunable load may be an input load or an output load. The signal generated by the frequency synthesizer may be sequentially applied to the input load and the output load. A logarithmic amplifier may generate an RSSI signal from the LNA output during the calibration process. The RSSI signal may be utilized for controlling a tunable load coupled to the LNA and optimize the tuning of the LNA in a desired channel by adjusting the tunable load.07-01-2010
20090093226RECEIVING APPARATUS AND METHOD - The present invention provides a broadcast signal receiving apparatus and method both capable of reducing the influence of noise generated inside the receiving apparatus. A CPU transmits control information about an optimum TS output rate corresponding to a received channel signal to an OFDM-LSI, based on each output rate setting table stored in a memory in advance. The OFDM-LSI sets an optimum output rate and transmits a signal in accordance with the set optimum output rate.04-09-2009
20090111406Diversity reception in radio receiver - A method, apparatus, and computer program for controlling diversity reception in a radio receiver are provided. The radio receiver is configured to either activate or disable the diversity reception according to an application type of an application requesting transfer of data.04-30-2009
20110059708METHOD AND SYSTEM FOR TUNING AN ANTENNA USING INJECTION - A method for wireless communication includes adding a received DVB-H signal with a reference oscillator signal to generate an added DVB-H signal. The reference oscillator signal may be added at an input of a matching load. The matching load may be used to tune a wireless antenna that receives the received DVB-H signal based on a received signal strength indicator (RSSI) associated with the added DVB-H signal. The reference oscillator signal may be generated, and the generated reference oscillator signal may be amplified. The added DVB-H signal may be amplified subsequent to the adding. The RSSI associated with the added DVB-H signal may be determined. The tuning may occur during receiving of a preamble of a packet for the received DVB-H signal.03-10-2011
20110111712BROADCASTING RECEIVER - Provided is a broadcasting receiver (A), which includes: a tuner unit (05-12-2011
20090111405Signal matching module for single or multiple systems - A signal matching module for single or multiple systems is disclosed, thereby enhancing the flexibility in using a communication module, and the performance of each subsystem. Further, a fine-tuning function is introduced into a selective matching circuit for the case that the inner matching components in the communication module cannot reach a required matching. Still further, a multi-stage matching circuit is used to reach a required Q-value (quality factor) for the matching circuit, thereby tuning the bandwidth. One of the preferred embodiments is to provide a unit cell which is used to connect with one or multiple subsystems, and a feeding point disposed outside the matching circuit to generate a better impedance matching and bandwidth.04-30-2009
20130130634Method for Arranging Tuning Parameters to an RF Radio Module - A mechanism for providing tuning values to an RF radio module that, does not have memory for storing tuning values. Tuning values are requested from a server maintaining tuning values. The request is made by a device including the RF radio module for which the tuning values are requested. Requested tuning values are then received in accordance with the request. The received tuning values are stored in to a memory of the device including the RF radio module and applied to the RF radio module.05-23-2013
20090036073Small signal identification device - A portable device that scans a subset of frequencies, such as the FM band, and displays to user the best carrier frequency for transmissions based on the received signal strengths. This device will find the carrier frequency that can provide the least amount of signal interference due to other transmitters in the area, and display the results to the user and/or reconfigures the receiver to tune to the best carrier frequency detected.02-05-2009
20120034890GEOGRAPHICALLY RELATED RADIO RECEPTION AND STATION SELECTION DEVICE AND METHOD - This invention relates a radio reception and station selection device related to geographical regions. It includes a tuning module and an AF output module, the tuning module interconnects the AF output module, the device further includes a positioning module, a display input module and a control module, each of the positioning module, the display input module and the tuning module connects the control module. This invention also provides a geographically related radio reception and station selection method. The device can display the station name, frequency, mode, and signal strength level of the local station signal source receivable on the display input module according to the Radio Regulations, and dynamically refresh with geographical changes. By using this device, listeners no longer need search for stations and store their names by themselves, it is a very convenient, time-saving device with an excellent visual operating system.02-09-2012
20110076971RECEIVING APPARATUS - A receiving apparatus discriminates RDS data containing traffic information corresponding to the vehicle's own position from RDS data of broadcasting stations searched for by frequency sweeping by a sub tuner front end 03-31-2011
20090088106RADIO FREQUENCY FILTERING - Radio frequency filtering includes receiving a signal and detecting a change in the direct current (DC) offset of the signal or a change in a component that affects the DC offset of the signal. The filtering also includes setting a cut-off frequency of a high-pass filter to a first frequency value in response to the detected change and filtering the signal using the high-pass filter with the cutoff frequency set to the first frequency value. The filtering further includes adjusting the cutoff frequency of the high-pass filter from the first frequency value to a second frequency value while filtering the signal using the high-pass filter where the second frequency value is less than the first frequency value.04-02-2009
20100056086Simplified 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.03-04-2010
20110151811Wireless Device With Selectable Antennas - Systems and methods for improving antenna performance and reducing antenna volume are disclosed herein. In one embodiment, a wireless communication device includes a first antenna, a second antenna, and a radio frequency receiver. The first antenna is tuned to support a first set of radio frequency bands. The second antenna is tuned to support a second set of radio frequency bands. The radio frequency receiver combines signals detected by the first and second antennas to produce a baseband signal. The second set of radio frequency bands is different from the first set of radio frequency bands.06-23-2011
20110136453Emergency Broadcast Receiver - Disclosed is an emergency broadcast radio receiver. The receiver can comprise a signal detector circuit adapted to detect, when powered, a predetermined emergency broadcast signal, and a timing generator circuit adapted to couple a battery to the signal detector circuit to periodically power the signal detector circuit. The receiver also can comprise a demodulator circuit adapted to demodulate, when powered, an audio signal modulated on a radio frequency signal at a tuning frequency. The signal detector circuit can be adapted, on detection of the predetermined emergency broadcast signal, to couple the battery to the demodulator circuit to power the demodulator circuit. Other embodiments are also disclosed.06-09-2011
20100190458METHOD OF TUNING RECEIVER HAVING TUNABLE AMPLIFIER WITH INTEGRATED TRACKING FILTER - A method of tuning a receiver includes: providing a tunable Low Noise Amplifier (LNA) having a plurality of LNAs and a plurality of LC loads coupled to the plurality of LNAs; selecting a desired LNA and a LC load corresponding to the desired LNA; isolating the desired LNA from the selected LC load; generating a local oscillation (LO) signal; routing the LO signal to the output of the tunable LNA to generate a filtered LO signal; determining a first signal power level of the filtered LO signal; changing the capacitance in the selected LC load and determining a second signal power level of the filtered LO signal; comparing the first filtered signal power level to the second filtered signal power level; and according to the comparison result, determining whether or not to adjust the capacitance in the selected LC load.07-29-2010
20120302188TUNABLE MULTI-BAND RECEIVER - A tunable multi-band receiver supporting operation on a plurality of frequency bands is disclosed. In an exemplary design, the tunable multi-band receiver includes an antenna tuning network, a tunable notch filter, and at least one low noise amplifier (LNA). The antenna tuning network tunes an antenna (e.g., a diversity antenna) to a receive band in a plurality of receive bands. The tunable notch filter is tunable to a transmit band in a plurality of transmit bands and attenuates signal components in the transmit band. One LNA among the at least one LNA amplifies an output signal from the tunable notch filter. The tunable multi-band receiver may further include one or more additional tunable notch filters to further attenuate the signal components in the transmit band.11-29-2012
20100093293RF Circuit with Improved Antenna Matching - In one embodiment, RF front-end circuit includes a tunable matching network having an input coupled to an RF interface port, a directional coupler with a first connection coupled to an RF input of a mixer, a second connection coupled to an RF signal generation port, and a third connection coupled to an output of the tunable matching network. The directional coupler is configured to direct a signal from the RF signal generation port to the tunable matching network and to direct a signal from the tunable matching network port to the RF port of the mixer. The RF front-end circuit also has a tunable matching network control unit coupled to the tunable matching network. The control unit is configured to optimize an impedance match between the RF interface port and the output of the tunable matching network.04-15-2010
20120046006Selecting And Routing Sub-Signals From A Common Signal Path - According to certain embodiments, a system comprises a main transmission line, one or more piezoelectric filters coupled to the main transmission line, and one or more sub-signal transmission lines coupled to the one or more piezoelectric filters. The main transmission line communicates a main signal from an antenna to a main receiver. Each piezoelectric filter selects a sub-signal of a specific center frequency. Each sub-signal transmission line communicates a sub-signal to a sub-signal receiver.02-23-2012
20120028593MOBILE RECEIVER APPARATUS - A mobile receiver apparatus includes first tuner 02-02-2012
20120071123Antenna System Monitor - A system is disclosed for monitoring of individual frequency channels in an RF signal band by configuration of the electronic processor to operate the tunable filter to select desired channel sub bands. Measurement of forward and/or reverse-propagating fields within the selected sub-bands may be performed and corresponding power levels recorded. The records may be used to provide monitoring signals, such as measures of forward and reflected power, as well as VSWR, return loss. Indications or alarms may be activated if any of these quantities, associated with any one or more channels, falls outside a predetermined acceptable operating range.03-22-2012
20110065401RECEIVING DEVICE AND CONTROL METHOD FOR RECEIVING DEVICE - A receiving device that can maintain a desired search condition is provided.03-17-2011
20110105067LOW NOISE AMPLIFIER - A wideband tuneable low noise amplifier that is capable of receiving signals over a wide range of frequencies, providing tuneable filtering to remove out of band interferer signals, and providing variable gain for a wide range of frequencies. To accommodate variable gain, the low noise amplifier has an amplifier stage comprising two gain stages, and the relationship between the gain stages is controlled responsive to changes in the voltage gain of an input stage. Linearity monitoring combined with Q-enhance may be employed to increase performance at low signal levels.05-05-2011
20090131001SWITCH ARCHITECTURE - An apparatus may include a filtering network and a switch. From an amplified signal, the filtering network produces a filtered signal for wireless transmission in a frequency band. The switch includes a first terminal, a second terminal, and a switching element. The first terminal receives the filtered signal and the switching element selectively couples the first and second terminals. The filtering network also attenuates harmonics of the filtered signal that are generated by the switch. This attenuation establishes compliance with a harmonic emissions power limit associated with the frequency band. More particularly, this attenuation reduces at least one of the harmonics from a level exceeding the harmonic emissions power limit to a level within the harmonic emissions power limit.05-21-2009
20110183637MULTI-CARRIER-BASED TESTING - A device under test (DUT) may be connected to test equipment. The test equipment may include a multi-carrier signal generator and a host computer. The signal generator may provide a multi-carrier test signal that is fed to input-output devices of the DUT. The DUT may tune to a given radio channel on the test signal. The DUT may output an audio signal to the host computer to test for audio quality. Once desired measurements have been taken, the DUT may scan up or down to the next available radio channel on the test signal. The signal generator may not need to be reconfigured between scans, because the test signal contains multiple radio channels. The host computer may run a test program that directs a test program running on the DUT to perform the required tasks during testing.07-28-2011
20120220248MOBILE COMMUNICATION TERMINAL AND CONTROL METHOD - A mobile communication terminal that receives a signal from a plurality of access points and performs a wireless communication using any one of the plurality of access points, includes: a scanning unit configured to perform a scanning periodically to receive a signal including an identifier from respective access points; and a controller configured to compare a plurality of first identifiers received by a first scanning by the scanning unit with a plurality of previous identifiers received by a previous scanning performed before the first scanning, wherein, when a number of first identifiers which are identical to any of the previous identifiers is a predetermined number or more, the controller sets a specific period, as a period from the first scanning to a second scanning performed after the first scanning, to be longer than a previous period from the previous scanning to the first scanning.08-30-2012
20120220247Systems And Methods For Tunable Wavelet Transform Analysis Of A Signal - Methods and systems are disclosed for tuning first and second wavelet functions to resolve at least one component of a signal. A first characteristic frequency corresponding to a first scale band of interest is determined, and a first wavelet function is tuned to the first characteristic frequency in at least a region of a first scale band of interest. A second characteristic frequency corresponding to a second scale band of interest is determined, and a second wavelet function is tuned to the second characteristic frequency in at least a region of the second scale band of interest. A signal is transformed for the first and second wavelet functions using a continuous wavelet transform to create a transform signal, and a scalogram is generated based at least in part on the transformed signal.08-30-2012
20090061801FM Tuner - Adjacent interference is reliably detected in an FM tuner. A receiving field strength judgment circuit (03-05-2009
20120258678ENHANCED POWER CABLE ARRANGEMENT APPARATUS AND METHOD OF REDUCING A COMMON-MODE INTERFERENCE SIGNAL - An enhanced power cable arrangement apparatus (10-11-2012
20120264384TUNER MODULE AND A RECEIVING APPARATUS - Provided are a tuner module and a receiving apparatus capable of providing great degrees of variation and freedom to a layout in a main board, improving a degree of freedom of design, and achieving low cost.10-18-2012
20100203856RECEPTION MODULE AND RECEPTION APPARATUS INCLUDING THE SAME - A reception module includes a tuner for performing a tuning process on a received broadcasting signal, a signal processing device for performing a predetermined process on the broadcasting signal after the tuning process, a first memory which is used as a working region for the signal processing device, and a second memory which stores a program for operating the signal processing device, in which the individual elements are disposed on the same component side of a circuit board, and the tuner is disposed in a first space on the component side, the signal processing device is disposed in a second space that is located substantially in the middle on the component side, the first memory and the second memory are disposed in a third space on the component side, and the first space and the third space are located on the opposite sides with respect to the second space. The reception module is capable of suppressing influence of noise generated by the memory to operations of the tuner as much as possible with a main component group and without preventing downsizing as much as possible.08-12-2010
20100203855RECEPTION APPARATUS AND RECEPTION METHOD - A reception apparatus includes: a local oscillation section; first and second frequency mixing sections that mix received radio waves from AM and FM broadcast stations with an output signal from the local oscillation section to produce first and second intermediate frequency signals, respectively; an amplitude limiting section that limits an amplitude of the first or second intermediate frequency signal to a predetermined amplitude, and detects an intensity of the radio wave and a frequency offset from the signal; a multipath detecting section that extracts an amplitude change component in the signal amplitude-limited by the amplitude limiting section; and a control section that supplies a control signal for fixing the frequency to the local oscillation section when the intensity of the radio wave from the AM broadcast station and the frequency offset fulfill predetermined criteria, and when the amplitude change component is equal to or lower than a predetermined level.08-12-2010
20110159829Integrating Components In A Radio Tuner Integrated Circuit (IC) For A Tracking Filter - In one embodiment, the present invention includes a method for configuring a single chip radio tuner having a configurable front end, which may be adapted within an integrated circuit (IC). The method may include setting a controller of the tuner with configuration information for a radio in which the tuner is located. Then, control signals responsive to the configuration information can be sent to the configurable front end to configure the tuner.06-30-2011
20110159828Configurable Radio Front End - In one embodiment, the present invention includes a single chip radio tuner, which may be adapted within an integrated circuit (IC). The tuner may be provided with a configurable front end to receive and process a radio frequency (RF) signal via a signal path. This configurable front end may be differently controlled depending on a particular radio implementation in which the tuner is adapted.06-30-2011
20080220735FREQUENCY SELECTIVE AMPLIFIER WITH WIDE-BAND IMPEDANCE AND NOISE MATCHING - This disclosure is directed to a frequency-selective low noise amplifier (LNA) with wide-band impedance and noise matching. The LNAS may include a closed loop circuit that supports wideband input matching. For example, the closed loop circuit may be configure to impedance match an input signal and provide a low noise figure. In addition, the LNA may include an open loop circuit that amplifies the input signal and provides a high output impedance. The open loop circuit may further include a selectivity filter that filters out frequencies outside a desired frequency band. The LNA may drive a tunable band-pass filter via the open loop circuit.09-11-2008
20120282871RADIO WAVE RECEIVER - A radio wave receiver having an antenna for receiving a radio wave; a tuning unit for switching a frequency characteristic of the antenna in a stepwise fashion; an oscillation unit for oscillating a circuit section including the antenna and the tuning unit; a receiving process unit for executing a signal process by extracting a signal of a desired wave among received signals received by the antenna; and a search control unit for causing the oscillation unit to generate an oscillation signal at the circuit section and for searching, by switching a setting of the tuning unit, a setting condition of the tuning unit at which condition the oscillation signal is extracted by the receiving process unit; wherein the search control unit changes the number of minimum switching steps to be taken at a time or set pattern according to an adjustable range of the tuning unit.11-08-2012
20120282870SATELLITE RECEIVER, METHOD FOR OPERATING A SATELLITE RECEIVER, COMPUTER PROGRAM AND SATELLITE SYSTEM - A satellite receiver that is operable in a single cable system and that is configured to receiver satellite signals via an interface, comprises a controller configured to instruct the interface to perform a blind channel scan process over a predetermined frequency range to obtain measured spectrum signals and to change the predetermined frequency range until a desired frequency range has been measured. The satellite receiver further comprises a processing device configured to receive the measured spectrum signals, to process the measured spectrum signals to obtain a spectrum section and to concatenate the measured spectrum sections to obtain a spectrum.11-08-2012
20090215414AM BROADCAST RECEIVING CIRCUIT08-27-2009
20130210377WIRELESS COMMUNICATION DEVICE - A wireless communication device (08-15-2013

Patent applications in class Signal selection based on frequency (e.g., tuning)

Patent applications in all subclasses Signal selection based on frequency (e.g., tuning)