Abstract: An OAM reception apparatus (30) includes an OAM reception unit (34) and an interference compensation unit (35C) that are independent of each other. The OAM reception unit (34) and the interference compensation unit (35C) execute “OAM reception processing” and “interference compensation processing”, respectively, based on a plurality of vertical component signals and a plurality of horizontal component signals obtained by performing polarization separating and down-conversion on a plurality of reception radio signals received by a plurality of reception antenna elements (31-1 to 31-4).

Abstract: A terminal, a method for voice control, and related products are provided. The method for voice control is applicable to a terminal including a LPWAN communication module, and the method includes the following. A first enhanced LPWAN with at least one smart device is established. Voice data of a user is obtained and a control intention of the user for the at least one smart device is determined according to the voice data. A dedicated control instruction for a first smart device of the at least one smart device is determined according to the control intention, where the dedicated control instruction is used to instruct the first smart device to perform a corresponding operation. The dedicated control instruction is sent to the first smart device.

Abstract: A demodulator includes: a demodulation section that outputs a demodulated signal demodulated from a modulated signal; an integration section 60a that integrates the demodulated signal; a zone detection section 60b that detects a replacement target zone in the demodulated signal based on an integrated signal output by the integration section; and a replacement section 60c that replaces a signal of the replacement target zone in the demodulated signal with a replacement target signal. A noise can be removed by integrating the demodulated signal by the integration section, and detecting a replacement target zone in the demodulated signal by the zone detection section based on the integrated signal.

Abstract: A squelch detector includes is configured to receive a time-varying differential communication signal, and includes switched capacitors and an inverter configured to provide an indication of whether a level of the received communication signal is above or below a threshold value.

Abstract: An analog baseband filter apparatus for a multi-mode and multi-band wireless transceiver and a method for controlling the analog baseband filter apparatus are provided. The analog baseband filter apparatus includes a plurality of Radio Frequency (RF) units, each of the plurality of RF units being for receiving RF signals of one of a plurality of frequency bands and outputting baseband signals, a plurality of filter blocks for filtering and amplifying the baseband signals, and a switching unit for connecting at least two of the plurality of RF units to at least one of the plurality of filter blocks according to a selected communication mode, wherein the at least one of the plurality of filter blocks is configured to be connected to a capacitor region of an adjacent filter block from among the plurality of filter blocks.

Abstract: A received plurality of signals may be filtered to select an in-band signal and/or an out-of-band. A signal strength of the selected signal(s) may be measured. A resolution of an analog-to-digital converter may be controlled based on the measured signal strength(s). The selected in-band signal may be converted to a digital representation via the analog-to-digital converter. The resolution may be decreased when the strength of the in-band signal is higher, and increased when the strength of the in-band signal is lower. The resolution may be increased when the strength of the out-of-band signal is higher, and decreased when the strength of the out-of-band signal is lower. A signal-to-noise ratio and/or dynamic range of the selected signal(s) may be determined based on the measured signal strength(s), and may be utilized to adjust the resolution of the analog-to-digital converter.

Abstract: 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.

Abstract: An interference-robust receiver includes an RF signal processor, a frequency conversion interface and an analog signal processor. The RF signal processor provides an RF signal. The frequency conversion interface includes a passive mixer for generating an intermediate frequency signal by down-converting an in-band part of the RF signal to a passband of a filter and down-converting an out-of-band part of the RF signal to a stopband of the filter. The filter can thus filter the intermediate frequency signal with the passband and the stopband.

Abstract: A circuit includes a local oscillator of a transmitter, the local oscillator to generate a transmitter local oscillator signal. A switch controlled by the transmitter local oscillator signal connects with a baseband impedance element to generate a notch frequency signal. The notch frequency signal is added to a transmitter leakage signal to attenuate the transmitter leakage signal prior to demodulation of a desired receiver signal by a receiver.

Abstract: Methods and systems to produce audio output signals from audio input signals. In one embodiment, a first portion of the audio input signals can be pre-processed, with the output used to modulate ultrasonic carrier signals, thereby producing modulated ultrasonic signals. The modulated ultrasonic signals can be transformed into a first portion of the audio output signals, which is directional. Based on a second portion of the audio input signals, a standard audio speaker can output a second portion of the audio output signals. Another embodiment further produces distortion compensated signals based on the pre-processed signals. The distortion compensated signals can be subtracted from the second portion of the audio input signals to generate inputs for the standard audio speaker to output the second portion of the audio output signals. In yet another embodiment, noise can be added during pre-processing of the first portion of the audio input signals.

Abstract: To implement a filter circuit with low noise and a low cutoff frequency in a smaller area, a filter circuit has a first circuit which receives an input signal supplied to an input terminal, amplifies the signal, and outputs the amplified signal to an output terminal, a first differential amplification circuit for receiving the output signal of the first circuit through a first capacitance element, a first resistance element for forming a negative feedback path between the input and output of the first differential amplification circuit, and a second resistance element for forming a negative feedback path between the output of the first differential amplification circuit and the input of the first circuit.

Abstract: The illustrative embodiments described herein provide a method, apparatus, and computer program product for customizing settings in a communication device for a user. In one illustrative embodiment, the process identifies a user profile to which a user belongs. The process identifies a set of custom communication device settings associated with the user profile. The process also sets a current set of communication device settings for a set of functions in a communication device to the set of custom communication device settings. In one embodiment, identifying the user profile to which the user belongs includes identifying the user profile to which the user belongs based on one or more characteristics of the user.

Abstract: An RF signal reception device including: a transposition device of signals of frequency fRF to a first intermediate frequency IF1<fRF; a first bandpass filter centered on IF1; a sampler at a frequency fs<IF1; a second discrete-time filter centered on a second intermediate frequency IF2=?·fs/M+fs/(M·n); a decimation device of a factor M; an analog-digital convertor to operate at a frequency fs/M; where ?, n and M are strictly positive real numbers chosen such that: ?<fs/(2·BWch·M), and BWch/2<fs/M·n), with BWch: bandwidth of a channel of the received RF signals.

Abstract: A fluid sensor comprises a sensor housing (12), a sensor package (14), an actuator (16) and a switch (18). The sensor package (14) is disposed within the sensor housing (12) and includes first and second screens and at least one sensing membrane. The sensing membrane is disposed between the first and second screens (36) and is adapted to expand when exposed to a predetermined quantity of a first predetermined fluid. The actuator (16) is disposed proximate the sensor package (14) within the sensor housing (12) and moveable between a first position and a second position through an intermediate position. The switch (18) is disposed proximate the actuator (16) and is operable between closed and open positions. When the actuator (16) is in the second position at least a portion of the actuator (16) depresses the switch (18) to control an-electrical, circuit connected therewith.

Abstract: The present invention includes an apparatus for distributing a received modulated RF signal to a plurality of tuners including a diplexer device. The diplexer device includes a plurality of filter circuits adapted to direct respective portions of the received modulated RF the signal to respective tuner devices. In an illustrated embodiment, the tuner devices supply tuned signals to a picture in picture display device. Also disclosed is a method of receiving a modulated ready of frequency signal and routing portions of the received signal to respective tuner devices using filter devices in a diplexer or multiplexer configuration.

Abstract: According to one aspect, a mixed-signal tuner for analog and digital TV reception incorporates a demodulator for analog TV, employing various features for resolving limitations of the analog circuitry and for achieving compatibility with various global TV standards. Such features, which may be present in one or more embodiments, include the use of a variable sample rate in all digital clocks for frequency planning, and use of a microcontroller (MCU) to control various circuitry of the tuner.

Abstract: A technique for determining a received signal strength from multiple messages filters noise from the received signal to provide an accurate signal strength value. Advantageously, the more accurate output signal strength value can be used to identify movement of a station as well as estimate locations and direction of movement.

Abstract: Various embodiments are described herein for a universal television receiver that is capable of processing television channel signals broadcast according to a variety of analog and digital broadcast standards. Analog processing includes using coarse filtering with pass bands that are wide enough to accommodate frequency shifts in a desired television channel signal and analog circuitry variability and digital processing includes tracking a carrier frequency of the desired television channel signal to generate and apply a frequency shift feedback signal to compensate for frequency shifts in the carrier frequency.

Abstract: This invention concerns a repeater for radio frequency signals having a channel filter and an active filter connected to the channel filter output. The active filter covers the channels adjacent to the channel filter and includes an amplifier and; two bandpass filters in parallel connected as a negative feedback loop around the amplifier. The first bandpass filter covers the lower adjacent channels and the second bandpass filter covers the higher adjacent channels. The invention notably applies to the development of domestic repeaters for mobile terminals meeting the DVB-H digital television standard.

Abstract: Receiving an indication of a frequency ratio of first and second clocks; generating an indication of a number of clock pulses of the second clock occurring between first and second clock pulses of the first clock; and generating an indication of a time offset between (1) a clock pulse of the second clock occurring between the second clock pulse and a third clock pulse of the first clock, and (2) the second clock pulse of the first clock. Also, receiving an input data word representing a fractional number, a first part of the input data word comprising an integer portion of the fractional number and a second part comprising a decimal portion of the fractional number; providing a first output data word that is either the first part of the input data word or an increment by one of the first part; and providing a second output data word that is an integer multiple of the second part.

Abstract: An integrated circuit for a radio receiver comprising a radio-frequency amplifier and a radio-frequency filter is described. The amplifier receives radio-frequency signals from an antenna, the filter is connected to the amplifier output, and the output of the filter is provided to a processing stage of the receiver. The amplifier comprises an amplifying stage controlled by a radio-frequency input signal and a signal fed back from the filter. The amplifier input impedance is substantially matched to the antenna impedance at a frequency band of interest. The signal fed back from the filter providing attenuation of signals outside the frequency band of interest at the amplifier input. The filter comprises one or more filter components.

Abstract: Systems are disclosed that utilize AC-coupled filtering to reduce DC offset, with aspects dynamically correcting instantaneous DC offset generated from the AC-coupled filtering. A DC offset correction circuit for an radio frequency (rf) receiver, comprising a switchable high pass filter configured to receive a signal, the switchable high pass filter including a plurality of high pass filters connected in parallel, wherein at least one of the plurality of high pass filters has a tunable corner frequency.

Abstract: Seamless wideband support is afforded by utilizing split-band data streams. For wideband signals, the 8 kHz bandwidth is divided into a low band, with approximately 0-4 kHz bandwidth, and a high band, with approximately 4-8 kHz bandwidth. Narrowband functions and services operate on the low band, while wideband functions and services operate on both low and high bands.

Abstract: A plurality of carrier signals in a wide band signal is converted into a plurality of digital carrier signals. Each of the plurality of carrier signals is at a respective frequency in the wide band signal. At least one of the plurality of digital carrier signals is translated to a different frequency.

Abstract: A filtering device comprises an analogue quadrature splitter together with a first filtering element and a second filtering element. The filtering device is adapted to transform filtering characteristics of the first filtering element and filtering characteristics of the second filtering element into an effective filtering characteristic present in an output signal at an output terminal of the analogue quadrature splitter. The first filtering element and the second filtering element comprise filtering elements of high accuracy, with a steep roll-off but poor power handling capabilities. Using a high power quadrature splitter it is possible to transform the filtering characteristics of the first filtering element and/or the second filtering characteristic of the second filtering element into the effective filtering characteristics.

Abstract: The present disclosure provides a duplexer for separating a transmit signal and a receive signal. The duplexer comprises a transmit filter, a receive filter and an analogue quadrature splitter, a first filtering element and a second filtering element. By choosing the first filtering element and the second filtering element substantially identical, it is possible to transform filtering characteristics of the first and second filtering element such that stop bands are substantially transformed into an effective pass band, and vice versa. The analogue quadrature splitter is adapted to increase an attenuation of the transmit signals outside the transmit band, such as in the receive band. Therefore out-of-band emissions by the transmitter will be substantially reduced. The present disclosure further provides a method for separating a transmit signal and a receive signal, and computer program products for the manufacture for carrying out the method of separating transmit signals and receive signals.

Abstract: A received plurality of signals may be filtered to select an in-band signal and/or an out-of-band. A signal strength of the selected signal(s) may be measured. A resolution of an analog-to-digital converter may be controlled based on the measured signal strength(s). The selected in-band signal may be converted to a digital representation via the analog-to-digital converter. The resolution may be decreased when the strength of the in-band signal is higher, and increased when the strength of the in-band signal is lower. The resolution may be increased when the strength of the out-of-band signal is higher, and decreased when the strength of the out-of-band signal is lower. A signal-to-noise ratio and/or dynamic range of the selected signal(s) may be determined based on the measured signal strength(s), and may be utilized to adjust the resolution of the analog-to-digital converter.

Abstract: The invention relates to methods and apparatus for conducting directed communication using voice-grade radios. The methods and apparatus can be used to form a packet-switched wireless network using legacy analog transceivers, providing, e.g., both data and voice-over-Internet Protocol communication.

Abstract: A fixed point finite impulse response (FIR) filter comprising: 1) an input stage for receiving an input signal as a sequence of input samples comprising: i) delay elements connected in series for receiving and shifting N sequential input samples; ii) multipliers, each multiplier receiving a selected one of the N sequential input samples from the delay elements and multiplying the selected input sample by a corresponding coefficient to produce an intermediate product; and iii) a summer for receiving and adding N intermediate products from the multipliers to produce an output sum signal comprising a sequence of output sum samples; and 2) an output stage for truncating k least significant bits (LSBs) from each of the output sum samples, wherein k is a variable number.

Abstract: A fixed point finite impulse response (FIR) filter comprising: 1) an input stage for receiving an input signal as a sequence of input samples comprising: i) delay elements connected in series for receiving and shifting N sequential input samples; ii) multipliers, each multiplier receiving a selected one of the N sequential input samples from the delay elements and multiplying the selected input sample by a corresponding coefficient to produce an intermediate product; and iii) a summer for receiving and adding N intermediate products from the multipliers to produce an output sum signal comprising a sequence of output sum samples; and 2) an output stage for truncating k least significant bits (LSBs) from each of the output sum samples, wherein k is a variable number.

Abstract: A fixed point finite impulse response (FIR) filter comprising: 1) an input stage for receiving an input signal as a sequence of input samples comprising: i) delay elements connected in series for receiving and shifting N sequential input samples; ii) multipliers, each multiplier receiving a selected one of the N sequential input samples from the delay elements and multiplying the selected input sample by a corresponding coefficient to produce an intermediate product; and iii) a summer for receiving and adding N intermediate products from the multipliers to produce an output sum signal comprising a sequence of output sum samples; and 2) an output stage for truncating k least significant bits (LSBs) from each of the output sum samples, wherein k is a variable number.

Abstract: The present disclosure teaches a filtering device. The filtering device comprises a transforming unit, at least a first filtering element and a complementary filtering unit. The filtering device of the present disclosure allows an isolation of radio signals within a selected frequency band. Frequency bands closely-spaced to the selected frequency band may be suppressed. The present disclosure provides a reliable and almost identical response to temperature changes for the pass band within the selected frequency band and the stop bands closely-spaced to the selected frequency band. The filtering device withstands temperature changes without affecting a filtering performance different to the prior art. The present disclosure further provides a method for filtering an input signal as well as a computer program product for the manufacture of the filtering device and a computer program product for the carrying out of the method of filtering.

Abstract: Embodiments of a SAW-less RF receiver front-end that includes a frequency translated notch filter (FTNF) are presented. An FTNF includes a passive mixer and a baseband impedance. The baseband impedance includes capacitors that form a low-Q band-stop filter. The passive mixer is configured to translate the baseband impedance to a higher frequency. The translated baseband impedance forms a high-Q notch filter and is presented at the input of the FTNF. The FTNF can be fully integrated in CMOS IC technology (or others, e.g., Bipolar, BiCMOS, and SiGe) and applied in wireless receiver systems including EDGE/GSM, Wideband Code Division Multiple Access (WCDMA), Bluetooth, and wireless LANs (e.g., IEEE 802.11). In addition, embodiments of a multi-band SAW-less RF receiver front-end and techniques to share components of FTNFs included within the multi-band SAW-less RF receiver front-end are presented.

Abstract: The present invention relates to a portable terminal, and to a method and apparatus for improving broadcasting reception performance of the portable terminal by filtering a transmission frequency of a radio frequency unit introduced to a broadcasting reception path without experiencing broadcast signal loss. The filtering can be achieved using a filter that includes a variable capacitor in the broadcasting reception path. Accordingly, the transmission frequency of the radio frequency unit may be filtered without a broadcast signal loss. A capacitance of the variable capacitor may be controlled according to the broadcast channel.

Abstract: Methods and systems that utilize AC-coupled filtering to reduce DC offset, with aspects dynamically correcting instantaneous DC offset generated from the AC-coupled filtering. A DC offset correction circuit for an radio frequency (rf) receiver comprises a switchable high pass filter receiving a downconverted rf signal. The switchable high pass filter has N selectable corner frequencies, where N is greater than two.

Abstract: A technique for determining a received signal strength from multiple messages filters noise from the received signal to provide an accurate signal strength value. Advantageously, the more accurate output signal strength value can be used to identify movement of a station as well as estimate locations and direction of movement.

Abstract: There is provided a method that comprises identifying a parasitic signal transfer in a filter using a signal-directed graph; and adding compensation paths to the filter to reduce or eliminate the effect of the parasitic signal transfer A corresponding filter is provided which comprises a plurality of amplifier stages that generate one or more filter poles; at least one component coupled to at least one of the amplifier stages, the component causing a parasitic effect in the filter; and means for applying a compensation current to the at least one amplifier stage to reduce or eliminate the parasitic effect.

Abstract: Radio-frequency (RF) circuits, methods and systems are implemented according to a variety of embodiments. According to one such embodiment, a radio-frequency (RF) receiver circuit is implemented with an adjustable RF filter circuit in a receive path of the RF receiver circuit. A local oscillator (LO) generates a LO signal and an RX_LO signal from the LO signal. A mixing circuit mixes a signal received from the adjustable RF filter circuit and the RX_LO signal. An intermediate-frequency (IF) circuit generates an IF_cal signal at the receiver circuit. A calibration circuit implements both a calibration mode and a receive mode. In the calibration mode, a calibration signal is injected into the receive path. A setting of the adjustable RF filter circuit is determined. In the receive mode, the calibration circuit disables the injection of the calibration signal into the receive path of the RF receiver circuit.

Abstract: An arctangent detector according to the present invention generates a demodulated signal based on the result of arctangent calculation of the ratio between an in-phase component and a quadrature component obtained from a frequency modulation (FM) received signal that are perpendicular to each other. A median filter substitutes the median value of the sample values obtained by sampling the demodulated signal generated by the arctangent detector as many times as the point number for the current value of the demodulated signal and outputs a resultant signal. The point number altering unit alters the point number in the median filter based on the signal intensity of the FM received signal.

Abstract: A fixed point finite impulse response (FIR) filter comprising: 1) an input stage for receiving an input signal as a sequence of input samples comprising: i) delay elements connected in series for receiving and shifting N sequential input samples; ii) multipliers, each multiplier receiving a selected one of the N sequential input samples from the delay elements and multiplying the selected input sample by a corresponding coefficient to produce an intermediate product; and iii) a summer for receiving and adding N intermediate products from the multipliers to produce an output sum signal comprising a sequence of output sum samples; and 2) an output stage for truncating k least significant bits (LSBs) from each of the output sum samples, wherein k is a variable number.

Abstract: A radio frequency (RF) filter is provided which includes a band pass filter unit and an amplifying unit. If a signal having a frequency in a first band is input, the RF filter performs band pass filtering, and if a signal having a frequency in a second band is input, the RF filter performs an amplifying process. The RF filter can be used for various RF signal processing devices, such as digital broadcast receiving tuners.

Abstract: A method and apparatus for controlling the power consumption of a receiver based on current operating conditions is described herein. A receiver according to the present invention applies a received signal to a variable filter. The received signal includes a desired in-band signal. Depending on the current operating conditions, the received signal may further include one or more unwanted out-of-band blocking signals. A filter controller controls one or more operating parameters of the variable filter to maintain the power ratio at the filter output of the power of the blocking signal(s) to the in-band signal at or below a desired level. In so doing, the present invention controls the receiver power consumption while still providing the desired receiver performance.

Abstract: In a radio receiving apparatus, an analog received signal is converted into a digital received signal. An unwanted wave in an adjacent channel band is rejected, that is adjacent to a passband for the digital received signal. The digital received signal with no unwanted wave is converted into a first demodulated signal. The first demodulated signal is converted into a second demodulated signal in analog form. A noise component is extracted from the first demodulated signal. The second demodulated signal is suppressed under squelch control when a squelch voltage that is a voltage of the noise component after rectification and smoothing becomes equal to or higher than a predetermined threshold level.

Abstract: A filtering device comprises an analogue quadrature splitter together with a first filtering element and a second filtering element. The filtering device is adapted to transform filtering characteristics of the first filtering element and filtering characteristics of the second filtering element into an effective filtering characteristic present in an output signal at an output terminal of the analogue quadrature splitter. The first filtering element and the second filtering element comprise filtering elements of high accuracy, with a steep roll-off but poor power handling capabilities. Using a high power quadrature splitter it is possible to transform the filtering characteristics of the first filtering element and/or the second filtering characteristic of the second filtering element into the effective filtering characteristics.

Abstract: A noise filter, used for a digital signal, configuring an [N?1]-stage filter by connecting the N-number of flip flops in series comprises a selection unit for outputting a filter output signal by selecting one of signals filtered by one to (N?1) stages based on a selection signals; and a wave form check unit for making the selection unit change a selection thereby by changing a value of the selection signal based on a pulse width on the filter output signal which is output from the selection unit.

Abstract: A method and circuit for receiving a radio frequency signal by receiving and amplifying the radio frequency signal to produce a received signal and generating first and second clock signals corresponding to first and second channel signals, respectively, of the received signal and multiplying the received signal with the clock signals to obtain the channel signals. Pre-selectivity filtering of the received signal is performed by filtering the first channel using a first impedance, filtering the second channel using a second impedance, and converting the first and second impedances with respect to one another through a first gyrator. Amplitude limiting of the first and second channels is performed to obtain first and second amplitude limited channels. Poly-phase selectivity filtering of the first and second amplitude limited channels is performed to obtain first and second selectivity filtered channels. The selectivity filtered channels are demodulated to obtain a data signal.

Abstract: A radio receiver front-end includes a tunable antenna interface and a low noise amplifying section. The tunable antenna interface is operably coupled to receive a wide bandwidth signal from an antenna, wherein the wide bandwidth signal includes a plurality of channel signals, and wherein the tunable antenna interface is tuned to pass a selected one of the plurality of channel signals substantially unattenuated and to attenuate remaining ones of the plurality of channel signals to produce a filtered wide bandwidth signal. The low noise amplifying section is operably coupled to amplify the filtered wide bandwidth signal to produce a filtered and amplified wide bandwidth signal.

Abstract: Embodiments of an active bandpass filter are described. Such a filter includes a transistor; a series-tuned inductive-capacitive (LC) network (STLCN) in a common source circuit associated with the transistor to produce a tuned degenerative filtering of at least one interfering signal; and a first, variable resistance associated with the STLCN to provide a first control of a resonance quality factor (Q) associated with the filter. Other embodiments may be described and claimed.

Abstract: An active step attenuator can attenuate the RF signal from a cable modem or other RF source. The active step attenuator converts the RF energy into a DC control signal that controls the attenuation applied to the RF signal. The voltage of the control signal is proportional to the RF energy, so that the active step attenuator attenuates a stronger RF signal more than a weaker RF signal. The active step attenuator may be in the form of a diplex circuit, one branch of which passes signals in one frequency band without attenuation and the other branch of which actively attenuates signals in another frequency band.

Abstract: An arctangent detector according to the present invention generates a demodulated signal based on the result of arctangent calculation of the ratio between an in-phase component and a quadrature component obtained from a frequency modulation (FM) received signal that are perpendicular to each other. A median filter substitutes the median value of the sample values obtained by sampling the demodulated signal generated by the arctangent detector as many times as the point number for the current value of the demodulated signal and outputs a resultant signal. The point number altering unit alters the point number in the median filter based on the signal intensity of the FM received signal.