Abstract: An implantable medical device (IMD) with a receiver having a higher power mode and a lower power mode. In the higher power mode, the receiver can receive a communication from an external device and pass the received communication to a controller, and in the lower power mode the receiver may not receive the communication from the external device and pass the received communication to the controller. In some cases, the IMD may include a physiological sensor providing an output to the controller, and the controller may control whether the receiver is in the higher power mode or the lower power mode based at least in part on the output of the physiological sensor.

Abstract: Disclosed are an electronic apparatus, a wireless signal receiving method thereof and systems having the same, which can prevent a problem in that when a first wireless module receives a first wireless signal, the first wireless signal is distorted due to an interference by a second wireless module for transmitting and receiving a second wireless signal, thereby resulting in malfunctions or errors in data reception. The electronic apparatus includes a first wireless module configured to receive, or transmit and receive a first wireless signal corresponding to a user's input from, or to and from an external apparatus, a second wireless module configured to transmit and receive a second wireless signal different from the first wireless signal via a network, and a controller configured to determine whether the first wireless signal received is a normal signal, and control a power supplied to the second wireless module, based on the determination.

Abstract: A vehicle communication device includes: a communication line establishment device that establishes a communication line with a mobile communication terminal; a manipulation state information transmission device that transmits manipulation state information indicating a manipulation state of a vehicular accessory to the mobile communication terminal; an output timing specifying information generation device that generates output timing specifying information for specifying separation of the mobile communication terminal from the vehicle as an output timing for the mobile communication terminal to output the manipulation state information; and an output timing specifying information transmission device that transmits the output timing specifying information to the mobile communication terminal.

Abstract: An apparatus, a method, and a computer program are disclosed, which can enable a wireless user equipment (UE) to reduce or avoid system losses, such as decode failures and the unavailability of page messages, which might otherwise result in a poor user experience. By way of example and not limitation, a UE may be configured to switch from a low-sensitivity receiver to a high-sensitivity receiver, or to a receive diversity configuration, when operating under poor channel conditions.

Abstract: A wireless device for receiving wireless signals based on channel conditions is described. The wireless device includes a direct sampling path used when operating in a direct sampling mode. The wireless device also includes a zero intermediate frequency path used when operating in a normal sampling mode. The wireless device further includes a first switch coupling a filter module input to an input of the direct sampling path and an input of the zero intermediate frequency path. The wireless device also includes a second coupling a filter module output to an output of the direct sampling path and an output of the zero intermediate frequency path. The first switch and the second switch are configured to switch between the direct sampling path and the zero intermediate frequency path based on a received signal power.

Abstract: A control apparatus of a capacitive touch sensor includes a capacitive sensor, a radio receiver, a setting unit, and a charge control unit. The capacitive sensor is coupled to a manipulation panel and detects an approach of a finger of a user to the manipulation panel and a touch of the finger on the manipulation panel. The radio receiver receives a radio broadcast at a radio receiving frequency. The setting unit sets a sensing frequency to a selected value, which is determined from a plurality of selectable sensing frequency values, corresponding to the radio receiving frequency. The charge control unit is coupled to a switching unit, and controls the switching unit to operate at the sensing frequency in order to charge and discharge an electrostatic capacitance generated between the capacitive sensor and the finger.

Abstract: According to one embodiment, a concurrent impedance and noise matching transconductance amplifier designed for implementation in a receiver comprises an input device configured to couple to a matching network of the receiver, and a boost capacitor connected to the input device to increase an input capacitance of the transconductance amplifier. The boost capacitor is selected to substantially minimize the receiver noise and to enable the concurrent impedance and noise matching of the receiver and the matching network. In one embodiment, the receiver comprises the transconductance amplifier to provide an amplified receive signal, and a mixer to produce a down-converted signal corresponding to the amplified receive signal, wherein the mixer is coupled to the transconductance amplifier by a blocking capacitor. The blocking capacitor is selected to substantially increase an amplitude ratio of the down-converted signal to the amplified receive signal to substantially increase the front-end gain of the receiver.

Abstract: A low noise amplifier device for receiving a radio frequency signal from a satellite contains an amplifier kept in a sealed chamber in a cryostat, and a cryogenic cooler mounted on the outside of the cryostat. The amplifier is: maintained in the sealed chamber attached to a cold finger of the cryogenic cooler, made of a material with good heat conductivity and without direct contact with the wall of the cryostat; connected to the input and output coupler, each traversing the wall of the cryostat; functional at room temperature and at least one cryogenic temperature well below room temperature; and the sealed chamber of the cryostat contains a gas at a pressure between a pressure close to the pressure outside the cryostat and 0.1 millibar.

Abstract: A method for reducing power consumption on a wireless communication device is described. The wireless communication device includes a first stage active filter and a second stage active filter. A condition measurement is obtained that includes a signal measurement condition. If it is determined that the condition measurement is above a threshold, the second stage active filter is bypassed.

Abstract: Aspects of a method and system for integrated blocker detection and automatic gain control are provided. In this regard, a communication device may generate one or more first signal strength indications based on a strength of a received signal at a first point in the analog front-end of the communication device. The communication device may generate one or more second signal strength indications based on a strength of the received signal at a second point in a digital processing module of the communication device. The first point in the analog front-end may be an input or an output of a down-conversion mixer. The second point in the digital processing module may be an output of an analog-to-digital converter or an output of a channel selection filter. The communication device may control, utilizing the first signal strength indication(s) and the second signal strength indication(s), a gain of one or more components of the communication device.

Abstract: FM receiver including an RF input circuit followed by a tunable mixer stage for frequency conversion of an RF FM signal into an IF FM signal, which is coupled to an FM input of a first narrow-band IF filter. The center frequency of the first narrow-band IF filter is controlled to vary in dependence on the IF FM signal. The first narrow-band IF filter is subsequently coupled to a first FM demodulator and a first LF signal processing unit. To increase the receiver's selectivity and sensitivity without adversely affecting tracking stability, the FM input of a first narrow-band IF filter is coupled through a second FM demodulator to a control input of said first narrow-band FM tracking filter for a feed forward tracking control of the center frequency of said first narrow-band FM tracking filter with the momentary frequency of the IF FM signal.

Abstract: There is provided a method for use in a wireless communication to avoid detection of a false modulated signal in a paged device. In one embodiment, a modulated signal is received by the paged device. Then, the modulated signal is identified by the paged device as a preliminary false modulated signal. Thereafter, the gain of at least one paged device amplifier and/or a matching threshold of the paged device is reduced by the paged device to decrease a sensitivity of the paged device to avoid detection of a future false modulated signal. In one embodiment, the wireless communication is a Bluetooth wireless communication and the paged device is a Bluetooth enabled device. An exemplary system for implementing one embodiment of the disclosed method is described.

Abstract: There is provided a method for use in a wireless communication to avoid detection of a false modulated signal in a paged device. In one embodiment, a modulated signal is received by the paged device. Then, the modulated signal is identified by the paged device as a preliminary false modulated signal. Thereafter, the gain of at least one paged device amplifier and/or a matching threshold of the paged device is reduced by the paged device to decrease a sensitivity of the paged device to avoid detection of a future false modulated signal. In one embodiment, the wireless communication is a Bluetooth wireless communication and the paged device is a Bluetooth enabled device. An exemplary system for implementing one embodiment of the disclosed method is described.

Abstract: A receiver 650 operates in close proximity to at least one other component 610, 611, 612 causing interferences in signals received by the receiver 650. It is determined (steps 2002; 2003) whether and at which frequency a higher harmonic of and/or an inter-modulation product with signals generated by the other component 610 causes interference in signals received by the receiver 650, based on information about signals generated by the other component 610, 611, 612. At least one characteristic of the receiver 650 is adjusted to diminish an influence by a determined interference.

Abstract: A broad band packet radio communication system is characterized by the carrier sense multiplexing connection method operated on a harsh frequency arrangement where an occupied band width of a modulation transmission/reception wave and a modulation side lobe are wide and the frequency channel interval is narrow. It is possible to improve the reception adjacent channel interference characteristic among a plurality of terminals belonging to the respective cells existing in the vicinity of adjacent frequency cell boundary area. The RSSI system is subjected to a narrow-band channel filtering (a narrow-band filter (BPF or LPF) having a band narrower than one-channel occupied band width) while the reception/demodulation system is subjected to a wide-band channel filtering (a wide-band filter (BPF or LPF) having a pass band equal to or wider than the one-channel occupied band width).

Abstract: An FM receiver is unaware of the modulation level (frequency deviation) of the signal and has to make an estimate of it, or some reasonable time-average of it, and accordingly set the input filter's bandwidth. We calculate modulation by measuring the autocorrelation of the recovered audio signal instead of its peaks, and then applying a peakhold detector. Since FM noise can be modeled to be somewhat uncorrelated, we can expect to get an accurate estimate of signal power while rejecting noise power substantially if we measure a one-sample delayed autocorrelation estimate. Since the above measurement is alike a power measurement, we compute its square root, gain adjust it to obtain a cleaner peak measurement, and then track these clean peaks using a leaky integrator. This gives an estimate of modulation that subdues the effect of the noise.

Abstract: An apparatus for wirelessly transmitting electric currents walls. The walls may be bulkhead compartment walls of a fixed structure or a vehicle or the like. The apparatus includes a wireless electric power transmission arrangement that includes an electronic device on one side of a wall, which is powered by a power source on another side of the wall. The electronic device may be a sensor arrangement having one or more sensors, a battery charging device, a through-the-bulkhead repeater device or other electronic device requiring power.

Abstract: A receiver (400; 500) comprising an amplifier (406; 506) having an input (408) and an output (410). The input (408) of the amplifier is configured to receive a signal. The receiver also comprises a feedback path (412; 512) between the output (410) and the input (408) of the amplifier (406; 506), wherein the feedback path (412; 512) includes a filter (402; 502) and a buffer amplifier (414; 514) in series. The input of the buffer amplifier (414; 514) is connected to the output (410; 510) of the amplifier (406; 506). The output of the buffer amplifier (414; 514) is connected to the input of the filter (402; 502). The output of the filter (402; 502) is connected to the input (408; 508) of the amplifier (406; 506). The filter (402; 502) is configured to pass signals having a desired frequency.

Abstract: A direct-conversion radio receiver is provided. The receiver includes a first measurement unit configured to measure a signal level of a received signal at an input of the receiver. The receiver also includes a gain controller configured to stepwise adjust at least a front-end gain and a baseband gain of the receiver when the signal level of the received signal at the input of the receiver exceeds a given sensitivity level, and adjust the front-end gain with at least one further gain step when the input signal level is below the given sensitivity level.

Abstract: There is provided a method for use in a wireless communication to avoid detection of a false modulated signal in a paged device. In one embodiment, a modulated signal is received by the paged device. Then, the modulated signal is identified by the paged device as a preliminary false modulated signal. Thereafter, the gain of at least one paged device amplifier and/or a matching threshold of the paged device is reduced by the paged device to decrease a sensitivity of the paged device to avoid detection of a future false modulated signal. In one embodiment, the wireless communication is a Bluetooth wireless communication and the paged device is a Bluetooth enabled device. An exemplary system for implementing one embodiment of the disclosed method is described.

Abstract: A mobile wireless communications device includes a housing and a circuit board carried by the housing and including Radio Frequency (RF) circuitry and a processor carried by the housing and operative with each other. A Near Field Communications (NFC) circuit is positioned on the circuit board and operative with the processor for communicating in accordance with the NFC communication protocol. A touch activated sensor is supported by the housing and operative for enabling operation of the NFC circuit when touched to establish NFC communications from the communications device.

Abstract: A method for a communication device includes determining whether a first radio frequency (RF) signal at a level of at least a first predetermined field threshold is detected. The method also includes generating a second RF signal at a level of at least a second predetermined field threshold greater than the first predetermined field threshold, when the communication device receives an instruction to generate the second RF signal and the determining determines that the first RF signal at the level of at least the first predetermined field threshold is not detected. The method further includes receiving a load modulated RF signal in response to the second RF signal.

Abstract: A system for estimating parameters of an incoming signal is provided. At least one antenna is coupled to at least one suitable receiver. The antenna(s) are spatially translated in an arbitrary trajectory. As the antenna(s) is being spatially translated, a data processing means samples the incoming signal at set intervals based on a clock signal provided by a system clock. By sampling the incoming signal at different times at different spatial locations on the arbitrary trajectory, the system acts as a synthetic antenna array. The different samplings of the incoming signal at different times and positions provide signal diversity gain as well as different readings which can be used to estimate and/or calculate various parameters of the incoming signal. The different samplings can be used to detect the incoming signal, estimate its angle of arrival, estimate its time of arrival, as well as other parameters.

Abstract: A semiconductor integrated circuit for broadcast receivers, which integrates an RF circuit, a mixer, an IF circuit, and an intermediate-frequency signal processing circuit onto a single chip, additionally includes a second RF circuit whose input terminal is grounded through an impedance equivalent to or almost the same as the output impedance of an antenna circuit, and a second mixer downstream of the second RF circuit. The second RF circuit and the second mixer each has an input impedance equivalent to that of the received signal subsystem; therefore, a spurious component equivalent to the spurious component contained in the output signal of the received signal subsystem is detected in the second RF circuit and in the second mixer, and cancels out the spurious component contained in the output signal of the received signal subsystem. Accordingly, the effects of noise due to spurious can be effectively reduced.

Abstract: A compact receiver which is easy in adjustment of a reference signal level is provided. A receiver having an antenna for receiving a wireless signal, a single pole single through switch which passes a signal received via the aforesaid antenna and outputs the signal when a first control signal is in a first state, and connects a signal received via the aforesaid antenna to a reference potential when the first control signal is in a second state, and a difference circuit which outputs a difference signal of an output signal of the aforesaid single pole single through switch when the first control signal is in the first state and an output signal of the aforesaid single pole single through switch when the first control signal is in the second state is provided.

Abstract: A radio frequency (RF) receiver having enhanced sensitivity is provided. In one embodiment, the receiver comprises at least one antenna, a preselector unit operative to receive an RF signal from the at least one antenna and output a preselected RF signal, and a frequency synthesizer operative to generate a signal at a predetermined synthesizer frequency. A mixer is operative to multiply the preselected RF signal and the predetermined synthesizer frequency and output a product signal. The receiver also includes an intermediate frequency (IF) filter unit that is operative to receive the product signal from the mixer and output an IF signal. The IF filter unit includes one or more narrow bandwidth filters having a bandwidth adequate to transmit information of interest. At least one of the narrow bandwidth filters comprises a carrier filter.

Abstract: A communication device includes an integrated circuit having an on-chip thermal sensing circuit that generates a temperature signal based on a temperature of the integrated circuit. A processing module processes the temperature signal to generate temperature information that can be transmitted to a remote device or processes the temperature signal to generate control for adjusting transmit and/or receive characteristics of an RF transceiver.

Abstract: Adjacent interference is reliably detected in an FM tuner. A receiving field strength judgment circuit (102) compares a reception field strength signal SM-DC input from an S-meter circuit (92) and a reference voltage Vref2, and outputs a receiving strength judgment signal SRE. An SD band judgment circuit (104) uses a window comparator to determine, based on an f-V conversion characteristic of a detection output SDET, whether or not a voltage ?V generated based on SDET is within a voltage range corresponding to a narrow band WN, and whether or not the voltage ?V is within a voltage range corresponding to a wide band WW; and outputs determination signals SBD-N, SBD-W corresponding respectively to WN, WW. An SD circuit (106) performs a station detection based on SRE and SBD-N, and determines the presence or absence of adjacent interference based on, e.g., SBD-N and SBD-W.

Abstract: Described herein are methods, devices and systems for characterizing an attached antenna to an electronic device, such as a radio frequency identification (“RFID”) reader. One exemplary embodiment is related to a method comprising outputting a low amplitude modulation (“AM”) index radio frequency (“RF”) waveform, the waveform simulating tag data timing and bandwidth, removing a direct current (“DC”) component from the waveform to create a chopped portion of the waveform, applying at least one vector analyzer technique on the chopped portion of the waveform, characterizing at least one antenna impedance vector of the waveform.

Abstract: A tunable receiving apparatus, includes a variable capacitative member, a tunable antenna having a resonant frequency controlled by the variable capacitative member, a tuner outputting a control signal related to a receiving-sensitivity of the tunable antenna, and a control circuit processing the control signal and controlling the variable capacitative member. The variable capacitative member is controlled automatically by the control circuit to optimize the receiving-sensitivity.

Abstract: A radio signal detector includes first and second detector circuits. The first detector circuit has a higher detection sensitivity to detect a radio signal earlier than the second detector circuit. The second detector circuit has a lower detection sensitivity to detect the radio signal accurately. When the second detector circuit detects the radio signal, it starts up a microcomputer. When the first detector circuit detects the radio signal, a time counter starts to count time. After being started up, the microcomputer acquires a time difference between the radio signal detection by the first detector circuit and the start-up. The microcomputer determines time of radio signal transmission by a radio signal transmitter device based on the determined time difference, and outputs control information after an elapse of a predetermined time.

Abstract: In a method and system for controlling gain in an RF receiver, an RF signal is analyzed over different attack and decay windows, from which the receiver determines (1) if the signal is in an attack condition with dip values below a threshold level thus indicating a need for increasing signal gain, or (2) if the signal is in a decay condition with threshold values above a threshold level thus indicating a need for decreasing signal gain. The receiver applies attack and decay windows of different sizes and in an asynchronous manner to create a gain control scheme that is insensitive to transient effects such as channel interference and deep fading that affect the intensities of an in-band signal.

Abstract: A signal quality estimation and control system for controlling a signal having noise. The system may include a signal strength determination system having an input configured to receive the signal and an output configured to output information indicative of the strength of the signal, a noise strength determination system having an input configured to receive the signal and an output configured to output information indicative of the strength of the noise in the signal, and a signal quality evaluation system. The signal quality evaluation system may have an input configured to receive the output of the signal strength determination system, an input configured to receive the output from the noise strength determination system, and an output configured to output information indicative of the quality of the signal based on the output from the signal strength determination system and the output from the noise strength determination system.

Abstract: A technique for improving frequency synthesizer performance by frequency-compensating charge pump current in order to maintain a consistent loop bandwidth over a wide operating frequency range is described. A relationship between the capacitance value associated with a voltage controlled oscillator resonant tank and the magnitude of current pulses in a related charge pump is exploited to bound the loop bandwidth of the frequency synthesizer over both operating frequency and process variation. A control state machine generates digital coarse tune values that dynamically select a capacitance for the resonant tank, such that the voltage controlled oscillator operates within an optimal control voltage range. Each dynamically selected capacitance value is then used to determine the magnitude of current pulses in the charge pump.

Abstract: 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.

Abstract: A frequency demodulator comprises a frequency discriminator configured to generate a frequency modulation signal from frequency modulated signal, circuitry for generating a phase modulation signal from the frequency modulation signal, and a click reduction signal processing (CRSP) circuit operable to remove noise enhancements from the phase modulation signal caused by clicks. By first converting the frequency modulation signal to a phase modulation signal, noise enhancements caused by clicks are more readily distinguished from other noise in the phase modulation signal. After the noise enhancements have been removed by the CRSP, the frequency modulation is recovered substantially free of clicks. Removal of the clicks results in an improved output signal-to-noise ratio, thereby advantageously extending the onset of the threshold effect.

Abstract: A receiver circuit for receiving an analog signal comprises a mixer device, a first integrator device coupled to the mixer device, a second integrator device following the first integrator device, a quantizer device, and first and second feedback digital/analog converters. The mixer device mixes the analog signal with a local-oscillator frequency and outputs a mixer current signal. The first integrator device generates a first intermediate signal by integrating the mixer current signal summed with a first feedback current signal, the second integrator device generates a quantizer input signal by integrating the first intermediate signal summed with a second feedback current signal, and the quantizer device generates a digital output signal by quantizing the quantizer input signal.

Abstract: A heterodyne receiver has a mixer with at least one transistor whose operating point can be varied dynamically. The quality of the output signal from the mixer is assessed in order to control the operating point. The operating point is set such that the collector current is increased when the intermodulation interference is high, thus improving the intermodulation resistance. The collector current is reduced when the intermodulation interference is low, thus reducing the transistor noise. Furthermore, the current drawn is reduced in this situation. The circuit and the method are particularly suitable for RF receivers without tunable input filters, and for receivers in which the power consumption must be low.

Abstract: A method and apparatus for automatically correcting the frequency of a local oscillator of a receiver. A primary common pilot channel (CPICH) code sequence is generated by a CPICH code generator based on a reference cell identification signal and a frame start signal. The received despread CPICH code sequence is used to generate an estimated frequency error signal. A control voltage signal is generated by a control voltage generator based on the estimated frequency error signal. The CPICH code generator generates the CPICH code sequence based on signals received from a high speed downlink packet access (HSDPA) serving cell when HSDPA is active, or a timing reference cell when HSDPA is not active. The present invention achieves full maximum ratio combining gain when space time transmit diversity (STTD) is used, even without receiving a transmit diversity indication.

Abstract: A signal relay apparatus, method, application program, and computer readable medium adapted for wireless network are capable of saving power consumption due to failure of adjusting amplifying gain dynamically and solving the difficulty of demodulation since noise is also amplified during relay. For wireless access network, the present invention decreases the transmission power of mobile devices so that the battery of the mobile devices may keep working longer and the interference inside is reduced.

Abstract: In one aspect, a calibration component configured to calibrate an automatic gain controller (AGC) for use in a tuner configured to isolate a selected channel from a multi-channel broadcast signal, the tuner implemented substantially on two chips, a first chip comprising a radio frequency (RF) integrated circuit adapted for RF processing and a second chip comprising a digital integrated circuit adapted for digital processing is provided.

Abstract: There is provided a method for use in a wireless communication to avoid detection of a false modulated signal in a paged device. In one embodiment, a modulated signal is received by the paged device. Then, the modulated signal is identified by the paged device as a preliminary false modulated signal. Thereafter, the gain of at least one paged device amplifier and/or a matching threshold of the paged device is reduced by the paged device to decrease a sensitivity of the paged device to avoid detection of a future false modulated signal. In one embodiment, the wireless communication is a Bluetooth wireless communication and the paged device is a Bluetooth enabled device. An exemplary system for implementing one embodiment of the disclosed method is described.

Abstract: Adjacent channel interference (ACI) suppression is achieved by selectively applying one or more pre-calculated fixed filters only when necessary, thereby preserving the sensitivity of the receiver. An energy detector accurately detects adjacent channel interference in the frequency band of the desired signal so that the likelihood of a false detection of ACI is very low. If the energy detector detects adjacent channel interference is present in the band of the desired signal, then the received signal is selected to be filtered by the pre-calculated filter, e.g., a low pass filter. Otherwise, the pre-calculated filter is bypassed. In either case, additional ACI suppression processing may be employed.

Abstract: The high-frequency IC according to an embodiment of the invention includes a mixer down-converting the RF signal into an IF signal with a given center frequency lower than that of the RF signal, a first-order low-pass filter with a pass band set narrower than a bandwidth of the IF signal down-converted by the mixer, and an active low-pass filter removing a signal outside the bandwidth of the IF signal.

Abstract: A radio-frequency signal receiver capable of enhancing reception performance includes an antenna for receiving radio-frequency signals, a first switch having an end coupled to the antenna, a filter coupled to the first switch, a second switch having an end coupled to the first switch and an end coupled to the filter, a low noise amplifier coupled to the second switch for amplifying signals received from the second switch, a frequency down converter coupled to the low noise amplifier for down-converting a frequency of signals outputted from the low noise amplifier, a signal processing circuit coupled to the frequency down converter for performing signal processing, and a control circuit for controlling the first and the second switches.

Abstract: Certain aspects of a method and system for programmable biasing mechanism for a mobile digital television environment are disclosed. Aspects of one method may include controlling a bias of components within each of a plurality of radio frequency (RF) front-ends that comprise low noise amplifiers (LNAs) integrated within a single chip multi-band RF receiver, and of components within each of a plurality of baseband processors integrated within the single chip multi-band RF receiver. The controlling of the bias is based on signal power measurements within the integrated RF front-ends and within the baseband processors, and each of the plurality of RF front-ends handles processing of at least one of: a received UHF signal and a received L-band signal.

Abstract: If receiving circuit is in a high-sensitivity mode, receiving circuit is switched to a low-sensitivity mode when the BER according to BER measurement circuit becomes more favorable than a release threshold. If receiving circuit is in the low-sensitivity mode, receiving circuit is switched to the high-sensitivity mode when the BER according to BER measurement circuit becomes more adverse than a start-up threshold. If switching between the high-sensitivity and low-sensitivity modes occurs, control is exercised so that switching from the high-sensitivity mode to the low is resistant to occurring, thereby suppressing the occurrence of a reception error caused by switching between the receiving modes.

Abstract: When performing switching control of reception modes trading off reception sensitivity against power consumption in a reception environment, the receiving apparatus and control method of the present invention perform state transition without a reception error occurring due to switching control with the aid of a reception mode in which an intermediate reception performance is provided. The present invention is particularly useful to balance the reception performance with the battery duration in a battery-powered, portable receiving terminal such as a television receiver for a mobile terminal.

Abstract: A radio signal detector includes first and second detector circuits. The first detector circuit has a higher detection sensitivity to detect a radio signal earlier than the second detector circuit. The second detector circuit has a lower detection sensitivity to detect the radio signal accurately. When the second detector circuit detects the radio signal, it starts up a microcomputer. When the first detector circuit detects the radio signal, a time counter starts to count time. After being started up, the microcomputer acquires a time difference between the radio signal detection by the first detector circuit and the start-up. The microcomputer determines time of radio signal transmission by a radio signal transmitter device based on the determined time difference, and outputs control information after an elapse of a predetermined time.

Abstract: The communication performance of a radio communication system is improved while keeping short time necessary for attaining synchronization. A low noise amplifier is selectively provided with one of an input signal supplied from the outside of the system and an oscillation output signal of a local oscillator. A mixer integrates the oscillation output signal of the local oscillator and an output signal of the low noise amplifier. An intensity discriminating unit discriminates the signal intensity of an output of the mixer. In a first state, the low noise amplifier amplifies the oscillation output signal of the local oscillator, and a control unit learns a frequency band of the low noise amplifier for maximizing the signal intensity on the basis of the discrimination result of the intensity discriminating unit. In a second state, the low noise amplifier is set to the frequency band learned in the first state and amplifies the input signal.