Abstract: An integrated low-IF (low intermediate frequency) terrestrial broadcast receiver and associated method are disclosed that provide an advantageous and cost-efficient solution. The integrated receiver includes a mixer, local oscillator generation circuitry, low-IF conversion circuitry, and DSP circuitry. And the integrated receiver is particularly suited for small, portable devices and the reception of terrestrial audio broadcasts, such as FM and AM terrestrial audio broadcast, in such portable devices.

Abstract: A signal transmission method includes using a signal integrating device to receive a first digital signal from a network line or to transmit a second digital thereto; feeding the power transmitted from the network line into the first digital signal to form an integrated signal; using a signal converting device to restore the integrated signal back to the network line power and the first digital signal; converting a first digital signal into a first analog signal or a second analog signal received from outside into a second digital signal; and using a coiled-wire cord connecting the signal integrating device and the signal converting device to transmit the integrated signal from the signal integrating device to the signal converting device or transmit the second digital signal from the signal converting device to the signal integrating device. The invention thereby achieves transmission of digital signals by a coiled-wire cord.

Abstract: Implementations related to media playback and storage devices are presented herein.

Abstract: In a method for synchronizing a receiver to a synchronous signal, a plurality of potential symbols are detected in a signal, the signal having been processed based on automatic gain control (AGC) with a varying gain. Next frame potential symbols corresponding to potential symbols in the plurality of potential symbols are determined, the next frame potential symbols being in frames subsequent to the frames in which the corresponding potential symbols are located. A gain of the AGC is fixed for each corresponding symbol interval during which a next frame potential symbol is operated on by the AGC. In between next frame potential symbols, the AGC is allowed to vary. Next frame potential symbols are analyzed after a transform is calculated to determine if any correspond to a start of a frame.

Abstract: A transducer for converting an input signal fed to a first input (2) into a corresponding electric output signal that is output via an output (3). The input signal can be processed via an analog transmission path (4) into an analog converter signal. The transducer allows for a quick conversion of the input signal into a corresponding output signal having a high accuracy and suitable for applications having increased safety requirements, wherein the input signal can be additionally processed via a separate digital transmission path (5) into a digital converter signal. The analog converter signal and the digital converter signal are evaluated by an evaluation unit (6) and the evaluation unit (6) generates the electric output signal based on the analog converter signal or the digital converter signal.

Abstract: Improved control apparatus and methods transfer information between devices, such as controllers and field devices, utilizing a modulator that generates a pulse width modulated (PWM) signal containing information to be transferred by a first of the devices, e.g., the controller, to the second device. A transformer or other inductive device transfers the PWM signal across the isolation barrier, where it is demodulated to analog form for application to the second device, e.g., the field device. Information transferred from the second device to the first device can be transferred in an amplitude modulated (AM) signal that utilizes, as its carrier, a fixed duty cycle output of the modulator that generates the PWM signal.

Abstract: The present invention relates to an alarm management system intended to be carried onboard an aircraft. More precisely, the invention is aimed at improving the certainty level relating to the integrity of the announcements of faults or information intended for the pilot and based on voice syntheses. For this purpose, the present invention proposes a device and a method for detecting the digital origin of an analog signal providing a validity signal (VAL) enabling the voice announcements made to the pilot to be rendered secure.

Abstract: An integrated circuit is embodied on a monolithic substrate and incorporates a tuning module of the direct sampling type that is able to receive satellite digital television analog signals composed of several channels, as well as several channel decoding digital modules connected at the output of the tuning module so as to deliver respectively simultaneously several streams of data packets corresponding to several different selected channels.

Abstract: The invention relates in particular to a method for transmitting an analogue signal in a predetermined frequency band on the basis of an initial digital signal sampled at a sampling frequency, said method comprising in particular a step of modifying the initial analogue signal so as to generate a modified analogue signal having a modified spectrum in said predetermined frequency band. According to the invention, the modifying step comprises a filtering step consisting in selecting said predetermined frequency band from said plurality of mirror frequency bands.

Abstract: A receiver system and method thereof are provided, wherein the receiver system includes a plurality of antenna elements, a receiver device, and a switching system. The antenna elements are configured to receive a signal including first and second antenna elements. The receiver device is in communication with the first and second antenna elements. The switching system switches between the antenna elements using a first switching device, to electrically connect the receiver device when a digital signal is available, and the digital signal received by the first antenna element has a greater signal quality than the digital signal received by other antenna elements. The switching system also switches among the antenna elements to electrically connect the receiver device and the first antenna element to receive the analog signal using a second switching device when the digital signal is unavailable.

Abstract: A transceiver architecture for wireless base stations wherein a broadband radio frequency signal is carried between at least one tower-mounted unit and a ground-based unit via optical fibers, or other non-distortive media, in either digital or analog format. Each tower-mounted unit (for both reception and transmission) has an antenna, analog amplifier and an electro-optical converter. The ground unit has ultrafast data converters and digital frequency translators, as well as signal linearizers, to compensate for nonlinear distortion in the amplifiers and optical links in both directions. In one embodiment of the invention, at least one of the digital data converters, frequency translators, and linearizers includes superconducting elements mounted on a cryocooler.

Abstract: Analog signals can be fully encoded as an asynchronous time sequence generated by a time encoding machine (TEM). With knowledge of the parameters of the time encoding machine, the asynchronous time sequence can be decoded using a non-linear time decoding machine. In one embodiment, the non-linear time decoding machine generates a set of weighted Dirac delta functions centered in the intervals of the asynchronous time sequence of the time encoding machine output. The weighting of each of the delta functions is determined by the parameters of the TEM as well as the values of the time sequence. The generation of the series of delta functions is a nonlinear operation (500, 510, 520). The input signal can be recovered from the series of weighted delta functions by (530) applying this series through an impulse response filter.

Abstract: Aspects of a method and system for a low-complexity variable frequency oscillator using direct digital frequency synthesis may include generating one or more digital output signals via a Direct Digital Frequency Synthesizer (DDFS) that may be clocked by a high frequency clock signal. The one or more generated digital output signals may be converted into an analog signal via a Digital-to-Analog Converter (DAC), wherein the analog signal comprises at least a local oscillator signal and a corresponding frequency image signal, and the DAC is clocked by the high frequency clock signal. A low-frequency output local oscillator signal may be generated by bandpass filtering the analog signal in a single-pole bandpass filter, the single-pole bandpass filter may be configured to retain the local oscillator signal component of the analog signal. An effective capacitance and/or an effective inductance of the single-pole bandpass filter may be programmably adjusted.

Abstract: A semiconductor device capable of preventing degradation of signal quality due to inclusion of noise and reducing the circuit scale. The constitution of a transmitter/receiver for transmitting/receiving a signal is fabricated on a semiconductor substrate (100). Part of the transmission and reception is performed by analog processing, and the other part is performed by digital processing. The digital processings of the transmission and reception are performed by using a common digital processing unit (20). A reception processing block (10) for analog processing of reception is disposed near a corner of the rectangular semiconductor substrate (100), and digital signal processing unit (20) is disposed near another corner not adjacent to the former corner.

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: The invention relates to a method of converting a digital BB (baseband) signal into an analog IF (intermediate-frequency) signal, wherein the digital BB processor signal is oversampled K times by means of a BB/IF converter, and each ith channel of the K channels is subsequently selected by means of a controllable ith digital interpolation filter comprised in the BB/IF converter and controllable in K steps and is shifted into the ith frequency position in the spectrum of the analog IF signal. The object of the invention to create standardized compensations in a practicable manner in W-LAN units for a distortion of the frequency response which occurs during signal processing and is caused by the effects of the gap function (si) during D/A conversion and by the use of the transmission method and the mode of modulation is achieved in that the frequency response of the digital BB processor signal is realized without pre-emphasis.

Abstract: Fast macrodiversity switching (FMS) dynamically switches radio links used for traffic and control channels for a mobile station among a number of base transceiver stations (BTS) without changing the radio resource, that is, using the same frequency and time slot combination (TDMA) or frequency and spreading code combination (CDMA). The traffic channel switching is under control of zone managers. Each BTS includes a zone manager where a host BTS has its zone manager designated as a host zone manager and other BTSs (assistant BTSs) have their zone managers designated as assistant zone managers. The control by the host and assistant zone managers includes switching down-link signals to and up-link signals from mobile stations among base transceiver stations which include broadcast channels (non-switched) and dedicated (switched) channels. Measurements of the wireless signals are made at macrodiverse locations.

Abstract: An apparatus for providing a multi-mode interface between a baseband receiver and radio frequency (RF) circuitry. According to a preferred embodiment of the invention, the apparatus includes a first differential-to-single-ended converter, a second differential-to-single-ended converter and an analog-to-digital converter. The first differential-to-single-ended converter receives an incoming differential current pair to be converted into a first single-ended voltage signal. The second differential-to-single-ended converter receives an incoming differential voltage pair to be converted into a second single-ended voltage signal. Further, the analog-to-digital converter selectively receives an incoming single-ended voltage signal, the first single-ended voltage signal, or the second single-ended voltage signal to be converted into a digital signal to be further processed by the baseband processor.

Abstract: A data transmission device for sending back data on a reflected wave of an unmodulated carrier, the data transmission device includes: an antenna adapted to receive an unmodulated carrier Fo from a data reader with which data is to be exchanged and send a reflected wave of the unmodulated carrier Fo to the data reader; subcarrier oscillation means for generating a subcarrier frequency Fs; subcarrier modulation means for digitally modulating sending data on the subcarrier Fs; D/A conversion means for generating the analog modulated subcarrier wave Fs by converting a digital modulated signal, generated by the subcarrier modulation means, into analog form; and frequency mixing means for mixing the unmodulated carrier Fo and modulated subcarrier wave Fs to generate new modulated waves Fo+Fs and Fo?Fs.

Abstract: A radio receiver measures a signal quality metric and modifies attributes of a local oscillator signal in response thereto. A digital signal processor may be used to determine a signal-to-noise-plus-distortion ratio (SNDR) of a baseband signal, and the overlap of two quadrature-related local oscillator signals may be modified.

Abstract: A method and apparatus for providing a digital automatic gain control (AGC) for a radio-frequency (RF) receiver. The receiver comprises a logarithmic analog-to-digital converter for sampling the analog RF signals, a FIR filter for filtering the digitized signals, a resampler for resampling the digitized signals, and an automatic gain control circuit. The AGC circuit controls the resampling process to provide automatic gain control function in the digital domain. The resampler circuit has as its input a digital signal having a first plurality of bits. The output signal from the resampler has a second plurality of bits, where the second plurality of bits are less than the first plurality of bits. The automatic gain control circuit controls the resampling of the first plurality of bits to form the second plurality of bits in accordance with an automatic gain control signal.

Abstract: A communication system comprises a first modem part arranged at a first location and a second modem part arranged at a second location that is remote from the first location. The first modem part and the second modem part in combination perform functionalities of a modem.

Abstract: Embodiments of the present invention can be used to enhance signals in a peer-to-peer radio system, such as a two-way radio system. In one embodiment, the invention includes receiving a communications signal on a channel from a remote radio at a radio using a plurality of antenna elements, such as an antenna array. The received communications signal includes a squelch code. The radio detects the squelch code, and enhances the received communications signal using the squelch code.

Abstract: A versatile, programmable, low-cost transmit line driver is provided. The line driver includes a digital-to-analog converter that receives a digital input and provides an analog output. The line driver is reconfigurable between the voltage mode of operation.

Abstract: Improved control apparatus and methods transfer information between devices, such as controllers and field devices, utilizing a modulator that generates a pulse width modulated (PWM) signal containing information to be transferred by a first of the devices, e.g., the controller, to the second device. A transformer or other inductive device transfers the PWM signal across the isolation barrier, where it is demodulated to analog form for application to the second device, e.g., the field device. Information transferred from the second device to the first device can be transferred in an amplitude modulated (AM) signal that utilizes, as its carrier, a fixed duty cycle output of the modulator that generates the PWM signal.

Abstract: A vehicle audio/video media system includes an adapter apparatus in electrical communication with an audio/video head unit. The adapter apparatus includes a digital input receiving digital audio/video content from an external source. A digital-to-analog converter is coupled to the digital input and converts the digital audio/video content into analog audio/video content. An output device is coupled to the digital-to-analog converter. The output device transmits the analog audio/video content to the audio/video head unit.

Abstract: An I2C control unit stores set data in a register, the set data concerning operation of a gate circuit and a clock generator, according to address data from an external CPU. For analog TV broadcasting, the gate circuit is opened to thereby suspend operation of the clock generator. The set data from an external CPU is then supplied to the tuner.

Abstract: A hybrid analog/digital phase-lock loop with high-level event synchronization provides a mechanism for generating a low-jitter clock from a timing reference that has a high jitter level and synchronizing the output clock to high-level events. A numerically-controlled analog oscillator provides a clock output and a counter divides the frequency of the clock output to provide input to a digital phase-frequency detector for detecting an on-going phase-frequency difference between the timing reference and the output of the counter. A synchronization circuit detects or receives a high-level event signal, and resets the on-going phase-frequency difference and optionally the counter to synchronize the clock output with the events. The synchronization circuit may have an arming input to enable the synchronization circuit to signal a next event. Another clock output divider may be included to generate a timing reference output, and the other clock divider also reset in response to a detected event.

Abstract: There is a need for an inexpensive, high-performance, fully-integrable, multi-standard transceiver, which suppresses spurious noise signals. The invention provides a topology that satisfies this need, using a first signal generator which produces an oscillator signal f1 and a second signal generator which produces a mono-tonal mixing signal ?2, where f1 is a multiple of the frequency of ?2; and a logic circuit for generating a multi-tonal mixing signal ?1, where ?1*?2 has significant power at the frequency of said local oscillator signal being emulated, neither of said cp1 nor said ?2 having significant power at the carrier frequency of said input signal x(t) or said LO signal being emulated.

Abstract: A technique that can reduce a size of a circuit in a radio receiver device such as a reader-writer device of RFID is provided. In a semiconductor integrated circuit device (IC) used for a transceiver such as a reader-writer in a UHF band electronic tag system, an operating unit including a multiplier, an adder, and a register is disposed between a baseband signal generating unit and a DAC unit. By this structure, an ASK modulation depth and a DC bias of an ASK modulation signal can be adjusted with a simple configuration.

Abstract: An integrated circuit (IC) includes a clock circuit, a processing module, and processing circuitry. The clock circuit is coupled to produce a digital clock signal. The processing module is coupled to determine whether a harmonic component of the digital clock signal having a nominal digital clock rate is within the frequency passband and to provide an indication to the clock circuit to adjust its rate from the nominal digital clock rate to an adjusted digital clock rate when the harmonic component of the digital clock signal is within the frequency passband. The processing circuitry is coupled to process, at the adjusted digital clock rate, the data to produce processed data having a rate corresponding to the nominal digital clock rate and to interpolate, at an interpolation rate, the processed data to produce interpolated processed data having a rate corresponding to the interpolation rate.

Abstract: A radio frequency integrated circuit (RFIC) includes a low noise amplifier amplifies an inbound radio frequency (RF) signal to produce an amplified RF signal. A down conversion module converts the amplified RF signal to a down converted signal based on a local oscillation. An analog to digital conversion (ADC) module converts the down converted signal into a digital signal. A baseband processing module converts the digital signal into inbound data, wherein at least one function of the baseband processing module is clocked by a plurality of baseband clock signals. A clock module produces the plurality of baseband clock signals, wherein a rate of each of the plurality of baseband clock signals is set such that frequency dependent noise components associated with each of the plurality of baseband clock signals are outside a frequency band associated with the inbound RF signal.

Abstract: A method for avoiding spurious emissions in an AM transmitter for digital transmission includes converting a digital modulation for controlling the AM transmitter into an amplitude signal and a phase-modulated RF signal. Non-linear distortions in an amplitude response and a delay-time characteristic of an amplitude branch are compensated for using a pre-equalization with inverse shapes by: measuring and storing the amplitude response and the delay-time characteristic of an amplitude branch; determining an inverse transfer function using respective shapes of the measured amplitude response and delay-time characteristic by an inverse Fourier transform; dimensioning an equalizing network for the determined inverse transfer function; and connecting the equalizing network in series upstream of the amplitude branch. An equalizing network is dimensioned for the determined inverse transfer function. The equalizing network is connected in series upstream of the RF branch.

Abstract: A method and a device for spectrally shaping nonlinear intersymbol interference (NLISI) in an oversampling digital-to-analog converter are disclosed. At least one higher-order shaper circuit is provided, so as to shape NLISI, causing energy associated with NLISI to fall outside a signal band. The signal-to-noise ratio achieved is better than signal-to-noise rations obtained in prior art NLISI reducing methods and devices.

Abstract: A calibration system for a communication system is provided featuring a transmitter circuit, a receiver circuit, a transmission medium having a transfer function for transmitting a signal between the transmitter and receiver circuits, and a calibration system responsive to the altered reference signal of the transmitter circuit for adjusting the reference signal level of one of the transmitter and receiver circuits to compensate for variations in the transmission signal due to the transfer function.

Abstract: Systems, methods and apparatus are provided for demapping a received wireless signal. The wireless signal includes signal-bearing data without accompanying pilot signals, and demapping is accomplished by extracting information from the signal-bearing data by reducing and averaging differential quadrature components or quadrature components of the received signal. Two embodiments are provided for the demapping procedure within a phase tracking loop.

Abstract: A method and system for the synchronization of the transmission of digitally converted analog modem signals between two or more modems using either RF over-the-air or A/C power line communication channels. This invention provides for modem speed optimization by minimizing or eliminating clock variance between the modems in a digital communication system. A fixed delay is created and maintained during modem operation. This invention is also adapted to function in a full-duplex communication system maintaining a fixed delay in both directions.

Abstract: A method for converting an analog signal to multiple different phase outputs with an analog-to-digital converter is provided. First, the analog signal is converted to a high-frequency datastream with a delta-sigma modulator. A plurality of low-frequency datastreams are then generated by periodically extracting the samples of the high-frequency datastream, wherein consecutively extracted samples of the high-frequency datastream are scattered to different low-frequency datastreams. The low-frequency datastreams have the same sampling rate, and the phases of the corresponding samples of the low-frequency datastreams are different from each other.

Abstract: Structures and techniques for implementing multiple-antenna configurations within a radio frequency receiver are provided. In one aspect, a modularized multi-antenna receiver is provided having multiple independent microelectronic dice mounted on a common module substrate. In another aspect, a multi-antenna receiver is provided that utilizes at least one single ended low noise amplifier and at least one differential low noise amplifier within a common receiver.

Abstract: A signal processing device is provided that includes a modulation unit that produces an amplitude element as well as a phase element from components that are applied thereto. A correction device is also provided, in which at least one of the components is supplied and is compared with an ideal nominal value. This is used to produce a correction factor, which is multiplied by the component which has been compared with the nominal value. The correction factor determined is used to correct any offset or distortion of the components produced by analog circuits.

Abstract: The invention is a method and transmission system which transmits an analog composite signal, including carriers which are respectively modulated with different digital data signal.

Abstract: A circuit is connected between a module and a pair of wires. The circuit includes a first connection line, a second connection line, radio frequency termination circuitry, a first transformer, a second transformer, a tapped inductance and a feedback cancellation filter. The first connection line is for connection to a first wire in the pair of wires. The second connection line is for connection to a second wire in the pair of wires. The radio frequency termination circuitry is connected between the first connection line and the second connection line. The first transformer has a first inductance and a second inductance. A first end of the first inductance is coupled to the first connection line. A first end of the second inductance is coupled to the second connection line. The second transformer includes a first inductance and a second inductance.

Abstract: Multiple audio digital to analog converters (DACs) are provided to convert multiple digital audio streams to analog audio signals concurrently in a personal computer. Different digital audio streams are routed to each DAC and audio output device depending on priority, desired quality and the source of the audio stream.

Abstract: A method and system for the synchronization of the transmission of digitally converted analog modem signals between two or more modems using either RF over-the-air or A/C power line communication channels. This invention provides for modem speed optimization my minimizing or eliminating clock variance between the modems in a digital communication system. A fixed delay is created and maintained during modem operation. This invention is also adapted to function in a full-duplex communication system maintaining a fixed delay in both directions.

Abstract: A technique is described for reliably determining whether a direct digital connection exists between a transmitting server modem and a receiving client modem. Such a determination is an essential part of the training procedure for modems that conform to ITU-T Recommendation V.90 but is also applicable to other data communications configurations and equipment. In some configurations in accordance with the present invention, segments of a modem training signal, L1L2, are used to make the determination.

Abstract: A divider module for use in an oscillation synthesizer includes a plurality of flip-flops and a logic circuit. The plurality of flip-flops is interoperably coupled to produce a divider value based on a control signal. The logic circuit is operably coupled to produce the control signal based on divider select signals. Each of the plurality of flip-flops includes a first differential latch module, a second differential latch module. The first differential latch module is operably coupled to produce a differential latched signal based on a differential flip-flop input signal. The second differential latch module is operably coupled to produce a differential flip-flop output based on the differential latched signal. Each of the first and second differential latch modules includes a sample transistor section, a hold transistor section, a first gating circuit, and a second gating circuit.

Abstract: A repeater system for receiving a modulated input signal and for transmitting a modulated output signal comprising a clock oscillator for providing a repeater system clock, a demodulator for demodulating an input signal and a modulator for modulating the demodulated signal to obtain a modulated signal. The demodulator comprises a first mixer, a first controllable oscillator and a feedback circuit, the first controllable oscillator being controlled by a first control value such that the frequency of the demodulated signal approaches a desired value. The modulator comprises a second mixer and a second controllable oscillator, the second controllable oscillator being controlled by a second control value such that the modulated output signal has a predetermined output frequency. A controller derives the second control value.

Abstract: A translation loop signal upconverter is disclosed. Embodiments of the invention minimize nth order harmonics and spurious tones in the radio frequency output spectrum of a portable transceiver. In one embodiment, the invention is a signal upconverter, comprising a modulator configured to develop a modulated intermediate frequency (IF) signal at a fundamental frequency, the modulated IF signal also including a plurality of nth order components, a synchronous oscillator configured to receive the modulated IF signal, the synchronous oscillator also configured to operate at the fundamental frequency of the modulated IF signal, thereby providing an IF signal substantially free of the nth order components, and a translation loop having a phase locked loop, the translation loop configured to receive the IF signal output of the synchronous oscillator, and supply a radio frequency (RF) output signal to a power amplifier.

Abstract: A power efficient and reduced electromagnetic interference (EMI) emissions transmitter for unshielded twisted pair (UTP) data communication applications. Transmit data is interpolated by N and processed by a digital filter to obtain the pulse shape required by the particular communication application. The digital filter output data is converted to a current-mode analog waveform by a digital-to-analog converter (DAC). The digital filter is integrated with the DAC binary decoder in a memory device such as a ROM with time multiplexed output. When implemented in such manner, the logical implementation and memory replaces digital filtering circuits, DAC decoding logic circuit and re-synchronization logic circuits that are conventionally implemented in hardware. Thus, the hardware functionality of these circuits is rendered into arithmetic form and implemented in a memory device.

Abstract: A base band modulation system. There is a microcontroller which receives and manipulates a digital data stream to provide for addition of miscellaneous flag data. There is a continuously variable slope delta demodulator (CVSD) to receive the manipulated data stream and convert this to an analog signal. There is also a second microprocessor to receive the same.