Abstract: A signal correction method and receiver receives an asynchronous wireless signal including a code signal, and determines whether the code signal is discriminated as a regular code. When the determined code signal is not discriminated as the regular code, the signal correction method and receiver changes a sampling time for the asynchronous wireless signal within a predetermined range on sampling. When the code signal is still not discriminated as the regular code after changing the sampling time, the signal correction method and receiver changes a tuning frequency of a local oscillation signal.

Abstract: An arbitrary number of signaling beacons are synchronized simultaneously and automatically by a received modulated control signal in accordance with an arbitrary communication protocol over a communication link which may be separate from or superimposed upon a perceptible signal periodically provided from signaling beacons. The periodic perceptible signal may be stabilized using a crystal oscillator or an external transmitted signal such as a global positioning system (GPS) signal and synchronization thus maintained for extended periods of time even when the synchronization communication link is not available. Interference is substantially prevented by the communication protocol while supporting the provision of any desired beacon control functions.

Abstract: In multi-path regions of high wave strength, noise in produced sounds of a vehicle audio system is reduced due to controlling of amplification of radio waves received by an on-glass antenna on the basis of wave strength at a running position of a vehicle and its change rate.

Abstract: Only a single, standard-independent clock rate is generated in a signal processor or a signal processing structure, and correspondingly only precisely one clock frequency generator is then arranged on the chip. The signal processing path includes at least one controllable, asynchronous decimator for transposing the reception signals present in a uniform time frame into a respective standard-specific time frame. This enables signals of a variety of mobile phone standards to be processed.

Abstract: An electronic system for accurately controlling the RF output power from a power amplifier (21) is implemented using a multiplier (28) which multiplies the output power by itself to provide a DC component which is fed to a variable gain amplifier (29) which provides a controlling signal via a comparator (24) and an integrator (25) to the power amplifier. The transfer function between controlling signal and output power is substantially linear, even during dynamic variation of the controlling signal. The system is capable of a large dynamic range, and exhibits constant control loop bandwidth over this range. This is of particular use to TDMA applications with a large dynamic range of levelled output powers because a fixed filter function can be used to shape the transmitted burst.

Abstract: A wireless communication system includes: a filter; and a semiconductor chip including a signal processing integrated circuit having an amplifier, wherein a main surface of the semiconductor chip is provided with a plurality of electrode terminals along an edge portion thereof; wherein the amplifier has a transistor including a control electrode, a first electrode through which a signal is outputted, and a second electrode to which a voltage is applied; wherein the control electrode, the first electrode and the second electrode of the transistor are connected to the electrode terminals, respectively; and wherein none of wirings are arranged between the electrode terminals and placements of the control electrode, the first electrode and the second electrode, making space between the electrodes and the electrode terminals narrow.

Abstract: A frequency scanning receiver minimizes the time needed for setting the frequency of a phased lock loop of a first local oscillator. The frequency scanning receiver is configured so that when the reference frequency of the PLL of the first local oscillator has been set at a high frequency, and the frequency error is less than the second IF, the frequency error is controlled to be zero by the control circuit switching the frequency of a second local oscillator or third local oscillator to an appropriate frequency using an output of a frequency discriminator.

Abstract: In an automatic gain control amplifier, an RF automatic gain controller controls the gain of a radio frequency signal. A frequency converter frequency-converts the radio frequency signal into an intermediate frequency signal. An IF automatic gain controller controls the gain of the intermediate frequency. A level detector detects a signal level of the gain-controlled intermediate frequency signal, and generates a level signal. An automatic gain control signal generator separately controls, based the level signal, the RF automatic gain controller and the IF automatic gain controller.

Abstract: A method for use by a receiver of a wireless communication system in providing information of use in adapting to changing characteristics of a communication channel (22) over which the receiver (23) receives a signal at an offset from a carrier frequency due to changes in the characteristics of the communication channel characteristics, the changing communication channel characteristics also causing from time to time changes in other characteristics of the communication channel (22), the method characterized by: a step (23b-1a 23b-1b) of providing expectation maximization estimates of autoregressive parameters representing the changing communication channel (22) using received signal samples extracted from the received signal and corresponding to transmitted pilot symbol; and a step (23b-1a 23b-1c) of providing an estimate of the channel impulse response and an estimate of a frequency offset of at least one multipath signal based on the estimated values of the autoregressive parameters.

Abstract: An interface between an RF processing section and a baseband processing section supports general purpose message transmission as well as satellite positioning system signal sample transmission between the RF processing section and the baseband processing section. The interface includes a bi-directional message interface and a data interface. The message interface supports transmission of power control messages to the RF processing section to provide detailed control over activation or de-activation of individual blocks of hardware circuitry in the RF processing section.

Abstract: In order to compensate for performance degradation caused by inferior low-cost analog radio component tolerances of an analog radio, a future system architecture (FSA) wireless communication transceiver employs numerous digital signal processing (DSP) techniques to compensate for deficiencies of such analog components so that modern specifications may be relaxed. Automatic gain control (AGC) functions are provided in the digital domain, so as to provide enhanced phase and amplitude compensation, as well as many other radio frequency (RF) parameters.

Abstract: A hardware resource manager (18) dynamically allocates hardware resources in a software-defined communications system. The hardware resource manager (18) creates a specification of required hardware resources (300) necessary for executing a system application. The hardware resource manager (18) then creates a list of candidate hardware resources (306) from the plurality of available hardware resources in response to an application creating its own abstract resource specification (78) of required hardware resources. The hardware resource manager (18) then maps each required hardware resource on the specification of required hardware resources to a least functional and most available candidate hardware resource on the list of candidate hardware resources in a manner that maximally preserves most functional and least available candidate hardware resources on the list of candidate hardware resources (316-326).

Abstract: A low-noise amplifier 500a having low-distortion characteristics (low distortion LNA), a low-noise amplifier 500b of a low current consumption type(low current consumption LNA), and radio-frequency switches 502 and 509 for selectively switching either of them are provided in a receiving radio-frequency unit 103. On the basis of a mode changing control function of a CPU 113, an LNA switch control signal AS is generated so that the low-distortion LNA 500a is selected during a period in which the operation of a radio transmitter-receiver is in a transmitting/receiving state, and that the low current consumption LNA 500b is selected in a period of a standby state, and thus the switching of the radio-frequency switches 502 and 509 of a low-noise amplifier circuit section 501 is controlled.

Abstract: We have disclosed an enhanced radio system that provides for the capture and playback of one or more radio stations. The user may tune to a station, or scan through stations, rewind to hear what was missed, and fast-forward through undesired content. The system allows a user to rate content, and to be notified when that content is being played on any station. The system may make radio station recommendations. The system allows the user to respond easily to radio content, download audio content, and send radio content to another user. The system may provide other radio related and radio content related information. The system may provide a karaoke mode. The system may also allow the user to integrate a telephone with the radio. The system may report usage information to a collection facility.

Abstract: In multi-path regions of high wave strength, noise in produced sounds of a vehicle audio system is reduced due to controlling of amplification of radio waves received by an on-glass antenna on the basis of wave strength at a running position of a vehicle and its change rate.

Abstract: A filter module for reducing a DC offset voltage in a radio frequency communication channel is described. A first capacitor is coupled between a first differential input node and a first differential output node. A second capacitor is coupled between a second differential input node and a second differential output node. An active variable resistor is coupled between the first differential output node and the second differential output node. The active variable resistor receives a control signal. The control signal adjusts the value of the active variable resistor, which adjusts the frequency response of the filter module. The rate at which the filter module reduces DC offset voltages is thereby adjusted. The filter module is also adaptable to single-ended applications.

Abstract: A wireless telephone system comprises a base transceiver having a base receiver and a plurality of wireless handsets. Each handset comprises a handset transceiver for establishing a time-division multiple access (TDMA) link over a shared channel with the base unit via the base transceiver, in which each handset communicates during an exclusive time slot of a TDMA scheme that allocates time slots to handsets. The base receiver is characterized by a plurality of demodulation parameters and is for synchronizing with each handsets. The base receiver stores a set of demodulation parameters for each handset and switches to the set of demodulation parameters for a particular handset when the base unit is to synchronize with the particular handset.

Abstract: A signal processing unit 107 outputs a control parameter of a gain control operation-starting electric field strength value in the form of a signal CN1 in correspondence with data of transfer speed/number of FM level by referring to a memory 108. Then, this signal processing unit 107 controls setting of an Received Signal Strength Indicator 105. When an electric field strength of a signal reaches an operation-starting electric field strength value, the Received Signal Strength Indicator (RSSI) 105 changes a voltage of an output GC1 based upon the control parameter (signal CN1). A gain control circuit 106 changes a gain control amount in response to the output signal GC1 derived from the Received Signal Strength Indicator 105. As a consequence, the operation-starting electric field strength value of the AGC operation can be set under optimum condition in correspondence with the sort of signal.

Abstract: An automatic gain control circuit with a very wide operational range, less hardware, and faster response, and more flexibility includes a signal strength estimator, a gain adjusting factor device and a multiplier. After the signal strength estimator finds signal strength, the gain adjusting factor device will generate a gain adjusting factor corresponding to the signal strength. Then the multiplier will update gain by multiplying it the gain adjusting factor.

Abstract: The cutoff frequency is set high in order to prevent suppression of low-frequency components so that high-quality reception control of a radio signal can be realized. A radio signal amplifier unit amplifies a received radio signal and results in an amplified signal. A frequency conversion unit mixes the amplified signal with a local oscillation signal to thereby convert the radio signal having a radio frequency signal into the radio signal having an intermediate frequency signal, resulting in an intermediate frequency signal. A frequency shift control unit shifts the intermediate frequency signal towards the upper part of the frequency band. A frequency inversion unit inverts a low-frequency side of the intermediate frequency signal towards the upper part of the frequency band and inverts a high-frequency side thereof towards a lower part thereof. An AC coupling unit is provided at an output side of the frequency control unit.

Abstract: A tire monitoring (TM) system includes a peak detector signal filter that is configured to substantially prevent impulse noise from increasing a data slicer threshold, while simultaneously allowing the data slicer threshold to follow the variations in a received message attributable to signal fading. The TM system also automatically determines the location of a plurality of vehicle tires relative to the vehicle, utilizes a single receiver to receive messages of multiple lengths and masks an alarm when a missing ID code corresponds to a stored ID code associated with a flat tire.

Abstract: A signal correction method and receiver receives an asynchronous wireless signal including a code signal, and determines whether the code signal is discriminated as a regular code. When the determined code signal is not discriminated as the regular code, the signal correction method and receiver changes a sampling time for the asynchronous wireless signal within a predetermined range on sampling. When the code signal is still not discriminated as the regular code after changing the sampling time, the signal correction method and receiver changes a tuning frequency of a local oscillation signal.

Abstract: An analog circuit for receiving satellite signals through an antenna. The circuit includes frequency transposition circuits and an analog/digital converter. Each frequency transposition circuit includes at least two frequency dividers of which due first is programmable so as to provide division ratios 140 and 143. The other divider provides one of the division ratios of 10 or 11. A third divider provides ratios of 3, 5, 7 or 8. These division ratios enable a single analog integrated circuit topography to allow a large number of possible applications including civil or military receivers operating on the GPS constellation or on the GLONASS constellation.

Abstract: The present invention relates to the extension of the RSSI range of a radio transceiver, in which the RSS value is monitored continuously during reception by a limiter circuit (1). This extension is performed by switching into the operating state of attenuation components (3, 4) which are already present in the receive path of the radio transceiver and in addition to an attenuation function have at least one further function required for operating the radio transceiver. Furthermore, a method is specified by means of which the additional attenuation of such a component (3, 4) which can be switched over can be established and stored in the radio transceiver.

Abstract: An electronic system, such as a wireless telephone handset (10), having multiple voltage-controlled oscillators (26, 28) so that the system can operate in a selected one of multiple frequency bands, is disclosed. Each of the voltage-controlled oscillators (26, 28) is associated with one of multiple loop filters (32, 34), which filter the control voltage (CP1, CP2) responsive to which the frequency of oscillation of the voltage-controlled oscillators (26, 28) controlled. Only one of the voltage-controlled oscillators (26, 28) is enabled at any one time, responsive to a control signal (VCOSEL). Synthesizer circuitry (30) includes a phase detector (44) which is coupled to a common node (VCOCLK) at which outputs of the voltage-controlled oscillators (26, 28) are coupled; the phase detector (44) compares the phase of this signal (VCODIV) to a reference signal (REFDIV) based on a reference clock (REFCLK), and controls a charge pump (46) accordingly.

Abstract: The present invention relates to the extension of the RSSI range of a radio transceiver, in which the RSS value is monitored continuously during reception by a limiter circuit (1). This extension is performed by switching into the operating state of attenuation components (3, 4) which are already present in the receive path of the radio transceiver and in addition to an attenuation function have at least one further function required for operating the radio transceiver. Furthermore, a method is specified by means of which the additional attenuation of such a component (3, 4) which can be switched over can be established and stored in the radio transceiver.

Abstract: Improved radio receiver designs can be used in the operational environment of wireless telephone communications. The radio receiver includes a variable attenuator, an RF signal amplifier, and a controller. The controller controls the amount of attenuation provided by the variable attenuator in response to signals received by the RF signal amplifier. The controller adjusts the variable attenuator to achieve a minimum symbol error rate and/or to maximize the signal-to-noise and interference ratio for a desired signal, irrespective of the levels of any interfering signals received by the RF signal amplifier. In this manner, the variable attenuator is adjusted to obtain just the right amount of intermodulation performance for a given set of receiving conditions. This technique saves operating current and minimizes noise figure because, in practice, interference conditions do not persist all of the time, and are usually of temporary duration.

Abstract: Improved radio receiver designs can be used in the operational environment of wireless telephone communications. The radio receiver includes a variable attenuator, a variable-current RF signal amplifier, and a controller. The controller controls the amount of attenuation provided by the variable attenuator, and/or the current consumed by the variable-current RF signal amplifier, in response to signals received by the RF signal amplifier. The controller adjusts the variable attenuator, and/or the RF signal amplifier, to achieve a minimum symbol error rate and/or to maximize the signal-to-noise and interference ratio for a desired signal, irrespective of the levels of any interfering signals received by the RF signal amplifier. In this manner, the variable attenuator, and/or the variable current RF signal amplifier, are adjusted to obtain just the right amount of intermodulation performance for a given set of receiving conditions.

Abstract: A communication receiver (100) includes a controller (206) providing control of at least first and second receiver operating states in response to corresponding first and second operations of at least one control (108, 110 or 112) by a user. A memory (216) stores a first control function table (308) defining an order by which a set of predetermined control functions is executed to control the first and second receiver operating states. A reconfiguration circuit (218), coupled to the memory (216) and to the at least one control (108, 110 or 112), enables the user to manually reconfigure the order by which a portion of the set of predetermined control functions is executed to control one or more different receiver operating states. The order by which the portion of the set of predetermined control functions is executed is stored within a second control function table (304) in the memory (216), and the controller (206) is responsive to the second control function table when stored.

Abstract: A console speaker assignment system that is self-prompting and which allows speaker assignment to be changed without interrupting the reception of audio signals or without interrupting normal console operation.

Abstract: A telecommunications system including a mobile unit is protected from operator-induced disruption by disabling the operator-adjustable controls of the mobile unit and fixing the operating parameters of the mobile unit. A supervisory apparatus incorporating supervisory circuit elements replacing the adjustable circuit elements associated with the operator-adjustable controls may be plug-connected between the main chassis and the control head of the mobile unit.

Abstract: Static audio-frequency control receiver for the time impulse interval process, consisting of a micro-computer, an electronic computing means and an evaluation component. In the micro-computer, a number of impulse scanning patterns are stored, and a programming field is formed for the selection of the impulse scanning pattern governing at the installation location. The programming field consists of a crossbar distribution panel with junctions from the outputs of the micro-computer with three inputs per command execution relay. The inputs for each of the relays have further connections for programming impulse scanning patterns. The micro-computer produces a series of rapid impulses upon connection, and performs a self-activating operation tests. The impulse scanning patterns cause connections to be made in the arithmetic unit for the production of impulse sequences in real time to the audio-frequency control command - impulse sequences. The micro-computer also has a synchronizing input.

Abstract: A television receiver includes a tuning system comprising a phase locked loop (PLL) configuration and an automatic fine tuning (AFT) configuration which are selectively enabled to operate in response to respective levels of a MODE signal to tune standard and nonstandard frequency RF carriers. In the absence of the RF carrier for a selected channel, the operations of PLL and AFT configurations are alternately enabled and the level of the MODE signal changes accordingly. The MODE signal is applied to a capacitor which develops a control voltage for turning the receiver "off" after the MODE signal has changed levels for a predetermined time because of the absence of a RF carrier.