Abstract: A communication apparatus is provided in which only a terminal having a specific positional relationship can perform communication through a relatively simple arrangement. When initial setting is performed or communication is started, a timing calculator calculates a time difference corresponding to the difference between a path from a first antenna to a terminal and a path from a second antenna to the terminal, based on a transmission signal from the first antenna and a reflection signal provided by having the transmission signal reflected from the second antenna or a communication partner, i.e. the terminal, and returned back to the first antenna. Based on the time difference thus calculated, the timing calculator outputs a signal for regulating the transmission timing of transmission data from the first antenna to a variable delay unit.

Abstract: Systems and methods are provided for automatically setting up an initial configuration of a wireless repeater and managing one or more wireless repeaters in a wireless local area network.

Abstract: In a radio including analog and digital portions, with at least one A/D converter between the analog and digital portions, and the selectivity of the radio at least partly implemented in the digital domain, an AGC controller sets a first variable gain amplifier (VGA) (302) to low gain upon a determination that a wide-band power estimation exceeds a wide-band threshold. The wide-band threshold is selected to reduce the occurrence of A/D converter saturation. If the wide-band power estimation is less than the wide-band threshold, then for each VGA (302) in the analog portion, a determination is made whether a narrow-band power estimate exceeds a narrow-band threshold, corresponding to that VGA (302), plus a hysteresis value, in which case that VGA (302) is set to low gain; or whether the narrow-band energy estimate is less than the narrow-band threshold minus a hysteresis value, in which case that VGA (302) is set to high gain.

Abstract: Apparatus and methods for the management of radio frequency spectrum within a network such as a CATV network. In one aspect of the invention, an improved signal reflector apparatus adapted for use in the network is disclosed, the reflector circuit being designed to strongly reflect signal frequencies at the lower end of the CATV reverse band, and/or above the higher end of the forward band, while simultaneously allowing the rest of the reverse band and the entire forward band to pass freely through the device. This selective filtering of the spectrum allows control signals generated within a premises or private network to be directed (by reflection) to other devices within that network. A blocking element (e.g., amplifier) may also be used to provide control of the transmission and attenuation profile of the reflector apparatus. The passage of power signals such as DC or low frequency AC is also optionally provided.

Abstract: The radio receiving apparatus includes an adaptive receive filter capable of detecting an interference wave and an out-of-band noise level correctly and improving reception performance. The radio receiving apparatus has a plurality of filters, a received signal power meter that measures the overall received signal power, a calculator that performs calculation that associates the measured received signal power with an output of AGC, an interference power meter that measures signal power in a frequency band outside a necessary band of the received signal, a comparator that compares the calculation result by the calculator with a specific threshold, and switches that select a filter to be adopted from the plurality of filters based on the outputs of comparators. The radio receiving apparatus detects adjacent interference based on signal power in the frequency band outside the signal band and detects the noise level based on the power level at an antenna end.

Abstract: The invention relates to methods by which radio signals can be transmitted to, and received by, a radio receiver such that the receiver consumes very little power from a battery or energy source. The invention is applicable not only to medical implants, but any application requiring a radio receiver to operate with very low power consumption.

Abstract: An RF switching circuit adapted to cancel selected harmonic signals. An unwanted harmonic signal Sh1 at a selected harmonic frequency Fsh of an operating frequency Fo exists in a signal Si conducted by the switching circuit, possibly produced by the switching circuit due to conduction through a first nonlinear impedance Znl(1). A compensating harmonic signal Sh2 is therefore generated by conduction via a nonlinear impedance Znl(2). Znl(1) may be due to parasitic conduction by “off” switching elements, while Znl(2) may be due to conduction by an “on” FET. The amplitude and/or phasing of Sh2 may be adjusted by selecting components for a network coupling Znl(2) to the conducted signal Si, such that Sh2 substantially cancels Sh1 across a target range of input power.

Abstract: A multi-sided radio (200) includes an audio centric side (210) including a speaker (208) operationally independent of functions on an opposing side, a data centric side (220) on the opposing side of the audio centric side, and a top controller side (250) having at least one control function (202 or 204). The audio centric side can include an option module (242) for placement as an insert enabling additional functions including camera functions, environmental sensors, WLAN transceivers, audio upgrades, and bar code readers as examples. The data centric side can include a keypad (214 and 216) and a display (218). The speaker can reside behind the display of the data centric side and has full porting out of the audio centric side.

Abstract: The disclosure provides a circuit and method for activating an electronic device from a low power state. The activation circuit comprises: a first accelerometer located in the device to detect a movement of the device along a specific axis; a second accelerometer which is activated upon receiving a movement signal from the first accelerometer indicating a movement of the electronic device along the specific axis; an input device; and a monitoring circuit connected to the input device and an output of the second accelerometer, the monitoring circuit providing power to the input device when the second accelerometer indicates movement of the device that surpasses a threshold and then generating an activation signal to operate the electronic device in a higher power state utilizing a notable signal received from the input device.

Abstract: This onboard reception device includes: a first receiver; a second receiver which is tuned to a second frequency which is different from a first frequency to which the first receiver is tuned, and whose reception level is low; a noise cancellation means which cancels noise included in a first demodulated received signal which is demodulated by the first receiver, based upon a second demodulated received signal which is observed by the second receiver; and an output means which outputs the first demodulated received signal in which noise has been cancelled, in a manner in which it can be appreciated by a user.

Abstract: There is provided with a filter circuit, including: an input terminal configured to input signals; a band stop filter configured to have a center frequency of input signals from the input terminal in a stop band and configured to reflect signals in the stop band that is included in the input signals and pass signals outside the stop band; a band pass filter configured to have a pass band including the stop band, and configured to pass signals in the pass band out of the signals having passed through the band stop filter; a synthesis circuit configured to synthesize the signals reflected on the band stop filter and the signals having passed through the band pass filter to obtain synthesis signals; and an output terminal configured to output the synthesis signals.

Abstract: Briefly, in accordance with one or more embodiments, a method and device capable of canceling self-jammer and one or more other interfering signals in an radio frequency identification system or the like is disclosed.

Abstract: In one embodiment, a method is provided. An in-band calibration tone is generated at a frequency of an undesired interfering signal. A receiver is calibrated using the calibration tone to reject image interference caused by the undesired interfering signal.

Abstract: Disclosed is a novel design of a fully integrated UWB transmitter. The transmitter includes a pulse generator, a pulse modulator, and an ultra-wideband drive amplifier. A new low voltage low power pulse generator circuit is disclosed which can be fully integrated in CMOS or BiCMOS process. This circuit includes a squaring stage, an exponential stage, and a second-order derivative stage. Based on this, PPM, BPSK and PAM pulse modulator circuits and system are disclosed. The modulated pulse is symmetrical second-order derivative Gaussian pulses with a bandwidth up to 5 GHz and having sufficient swing for UWB applications. An ultra-wideband driver amplifier is proposed to amplify the modulator output and drive the antenna. For the driver amplifier, common source resistor and inductor shunt feedback with current reuse technique is employed to achieve the ultra-wideband bandwidth, high gain, and providing matching for the antenna simultaneously.

Abstract: A mobile communications device has a wireless transceiver to facilitate communications, memory, and a processor. The processor may be configured to analyze an audio file stored in the memory, and extract or generate synchronizing information from the audio file. The processor synchronizes one or more complementary multi-media effects, such as lights, a camera, or a tactile feedback generator, with the audio file based on the synchronizing information. Alternatively, a user may input synchronizing information about the audio file via an interface on the communications device. The processor may then control the complementary multi-media effects in synchronization with the input synchronizing information.

Abstract: In one embodiment, a method provides multiple-tone wideband I/Q mismatch calibration. A plurality of calibration frequencies is selected within a channel. A calibration tone is applied to the channel at each of the plurality of calibration frequencies. An I/Q mismatch is estimated at each of the plurality of calibration frequencies. An n-th order filter is constructed to compensate received signals relative to the estimated I/Q mismatch related to each calibration frequency.

Abstract: A radio transceiver device includes circuitry for radiating electromagnetic signals at a very high radio frequency both through space, as well as through wave guides that are formed within a substrate material. In one embodiment, the substrate comprises a dielectric substrate formed within a board, for example, a printed circuit board. In another embodiment of the invention, the wave guide is formed within a die of an integrated circuit radio transceiver. A plurality of transceivers with different functionality is defined. Substrate transceivers are operable to transmit through the wave guides, while local transceivers are operable to produce very short range wireless transmissions through space. A third and final transceiver is a typical wireless transceiver for communication with remote (non-local to the device) transceivers.

Abstract: A circuit receives a first signal (for example, a baseband signal) and mixes it with a local oscillator (LO) signal, and outputs a second signal (for example, an RFOUT signal). The circuit includes multiple identical Mixer and Frequency Divider Pair (MFDP) circuits. Each MFDP can be enabled separately. Each MFDP includes a mixer and a frequency divider that provides the mixer with a local version of the LO signal. The MFDP outputs are coupled together so that the output power of the second signal (RFOUT) is the combined output powers of the various MFDPs. By controlling the number of enabled MFDPs, the output power of the second signal is controlled. Because the MFDPs all have identical layouts, accuracy of output power step size is improved. Because LO signal power within the circuit automatically changes in proportion to the number of enabled MFDPs, local oscillator leakage problems are avoided.

Abstract: A shared frequency transmitter for use in a network environment where transmitters and receivers of plural radio communication systems in which the same frequency is used exist is disclosed. The shared frequency transmitter includes (a) a communicating unit configured to detect peripheral transmitters existing in a peripheral area, and to exchange information with the detected peripheral transmitters; and (b) a signal generating unit configured to generate a transmit signal by applying an interference cancellation technique based on the information obtained through the exchange of information.

Abstract: Disclosed are a mobile communication terminal provided with a hands-free function and a controlling method thereof comprising the steps of: setting a hands-free function of a mobile communication terminal; certifying whether an originating call command or a calling request message are received; searching information of a calling party inputted by a user's voice or an arbitrary originating party's information from a mounted telephone directory; and guiding the searched calling party's information by voice and then connecting a calling. According to this, the user can originate or receive a calling by using a voice recognition function and the hands-free function of the terminal without his hands' using even while driving.