Abstract: A receiving circuit for a radio-wave clock broadcast wave having a frequency converter that converts a received signal of the radio-wave clock broadcast wave into a signal of a frequency in the bandwidth of an AM radio broadcast. The converted-into signal is input to a first high frequency amplifier of an AM radio receiver of a heterodyne type comprising the amplifier, an oscillator, a frequency mixer generating a signal of an intermediate frequency, an intermediate frequency amplifier amplifying the signal of the intermediate frequency, and a detector. Time correction is performed on the basis of a demodulated signal of the radio-wave clock broadcast wave output from the detector.

Abstract: A RF receiver includes a low noise amplifier and blocking module, a down conversion module, and a local oscillation module. The low noise amplifier and blocking module is coupled to receive an inbound RF signal, wherein the amplified inbound RF signal includes a desired RF signal component and a blocking RF signal component; attenuate the blocking RF signal component of the amplified inbound RF signal; and pass, substantially unattenuated and amplified, the desired RF signal component of the inbound RF signal to produce a desired inbound RF signal. The down conversion module is coupled to convert desired inbound RF signal into an inbound signal based on a receive local oscillation. The local oscillation module is coupled to produce the receive local oscillation, wherein the local oscillation module includes a notch filter module coupled to attenuate signal components of the receive local oscillation at frequencies corresponding to harmonics of the blocking RF signal component.

Abstract: A signal transmission arrangement includes a signal transmitter and a signal receiver wirelessly communicating with the signal transmitter. The signal transmitter includes a hybrid signal device to hybridize the audio signal with the control signal to form a consolidating signal, a frequency modulator to high-frequency modulate the consolidating signal, wherein the consolidating signal is amplified and sent to the signal receiver in a wireless manner. The signal receiver includes a frequency demodulator to demodulate the consolidating signal and a signal dissociating unit to dissociate the consolidating signal to restore the audio signal and the control signal. Therefore, the signal transmission arrangement provides a low-bit rate coding transmission in control signals, in lieu of the high-bit rate coding transmission which requires the expensive high performance integrated circuit, so as to ensure the quality of the audio signal while being cost effective.

Abstract: A direct-conversion receiver for a mobile communication system for substantially removing DC offset to recover an information signal from a carrier signal modulated by the information signal is disclosed.

Abstract: In a CDMA receiver, the TFCI decoding error is reduced. When the difference between TFCI correlation values is small and hence TFCI candidates are less credible, data is decoded using transport format information according to a plurality of TFCI having a high TFCI correlation value to select an appropriate TFCI using to a CRC judge result. Data is decoded according to the appropriate TFCI and is sent to the higher layer. Therefore, data decoded according to correct transfer format information can be reported to the upper layer. This resultantly keeps high utilization efficiency of finite wireless resources.

Abstract: A method for exchanging data with an integrated circuit includes antenna connection terminals. The method includes not connecting the antenna connection terminals of the integrated circuit to an antenna, applying an alternating emulation signal at least to a first antenna connection terminal of the integrated circuit, by way of a wire link, in order to emulate the presence of an antenna signal on the first antenna connection terminal, sending data to the integrated circuit by injecting them in the emulation signal, and receiving data sent by the integrated circuit by taking them from the emulation signal.

Abstract: A radio broadcast receiver includes: a frequency conversion circuit for receiving a radio broadcast wave and for outputting a reception signal; a detection circuit for detecting the reception signal of an analog radio broadcast wave and for outputting a detection signal; an automatic tuning device for searching a broadcast frequency; and a noise amplifier for amplifying a noise component in the detection signal and for outputting a noise detection signal. The automatic tuning device selects the broadcast frequency when the reception signal level is equal to or larger than a predetermined electric field intensity threshold value and a noise detection signal level is equal to or smaller than a predetermined noise determination threshold value.

Abstract: A mixer comprising a pair of low frequency mixer inputs, a pair of high frequency mixer inputs, a pair of mixer outputs, four switching units, each switching unit comprising a low frequency switching unit input, a high frequency switching unit input, a switching unit output, a node connected via a high pass filter to the respective high frequency switching unit input and via a low pass filter to the respective low frequency switching unit input and a switching device arranged to provide an output at the respective switching unit output in dependence on the voltage at the respective node, and comprising a first feedback loop responsive to the voltage at the first low frequency mixer input and arranged to regulate the current through the outputs of the first and second ones of the switching units so that the total current through the outputs of the first and second ones of the switching units is substantially proportional to the voltage at the first low frequency mixer input and a second feedback loop responsiv

Abstract: Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and filtering, and combinations and applications of same. Furthermore, QAM, QPSK, and other modulation techniques are also described.

Abstract: In a television signal transmission system, CS broadcasting signals received via a master antenna are converted into intermediate frequency signals in an LNB (Low Noise Block Down Converter). The CS intermediate frequency signals then undergo conversion of the modulation format, for example, from QPSK into 64-QAM, so that CS broadcasting signals from each transponder, having a bandwidth of, for example, 27 MHz, are accommodated in a narrower bandwidth, for example, 6 MHz, which is equivalent to one channel of terrestrial broadcasting services. Then, the signals accommodated in the narrower bandwidth is frequency-shifted into a vacant frequency band in the VHF band or the UHF band. Accordingly, the CS signals accommodated in the narrower band and frequency-shifted into the vacant band are multiplexed with terrestrial broadcasting signals in the VHF and UHF bands and BS intermediate frequency signals so that all these signals are delivered to each household via a single cable.

Abstract: An object of the invention is to provide an FM radio receiver capable of improving the receiving state. The radio receiver 10 is disposed within a vehicle room and provided with a vehicle-mounted antenna connection terminal 12. The radio receiver 10 includes a front-end unit converting to an intermediate frequency signal an FM broadcast signal received via a vehicle-mounted antenna 110, a signal line inserted between the vehicle-mounted antenna connection terminal 12 and the front-end unit, and an in-vehicle antenna 14 branching out from the signal line. A radio wave transmitted from an FM transmitter 40 disposed within the vehicle room via an antenna 42 is received by the radio receiver 10 via the in-vehicle antenna 14.

Abstract: The invention relates to a signal source (S) which comprises a local oscillator (5) for generating a reference frequency signal fo. The signal source comprises: a frequency divider by N (6) connected to the local oscillator (5) and delivering two quadratic square-wave signals (Id, Qd) at a frequency fo/N,N being equal to 2 or 4×n, and n being an integer number, and a multiphase filter (7) which supplies two sinusoidal quadratic signals (Is, Qs) at a frequency equal to m·fo/N on the basis of the quadratic signals (Id, Qd) issued by the frequency divider, m being an odd number. The invention finds its application in direct frequency conversion circuits and transmission circuits used in the field of telecommunication.

Abstract: An iterative multistage detection system and method for orthogonally multiplexing K channels onto a signal processing chain using N orthogonal sequences of length N. The K channels include a first set of N channels and a second set of M channels (the M channels being separate and distinct from the N channels), where K=N+M. In a first iteration, interference from the first set of N channels imparted on the second set of M channels is removed from the multiplexed signal, thereby enabling the symbol values associated with the second set of M channels to be reliably estimated. In a second iteration, interference from the second set of M channels imparted on the first set of N channels is removed from the first set of N channels, thereby enabling the symbol values associated with the first set of N channels to be reliably estimated.

Abstract: A direct conversion circuit that includes an in-phase and quadrature-phase feedback path that reduces Direct Current (DC) offset. Each feedback path includes a compensating mixer that generates an error correction voltage that is passed through a loop gain circuit and an integrator. The integrated signal is applied to the output of a low pass filter that operates on the down-converted baseband signal. The direction conversion circuit may not only down convert the received modulated signal using a down-converting mixer into a baseband signal, but also, after performing a passive low pass filtering to remove higher-order components, performs up-conversion of the baseband signal using an up-converting mixer. This allows active elements operating on the up-converted signal to introduce less 1/f noise.

Abstract: A system, method, and computer program product for automatically exchanging objects in a wireless mobile environment. The invention operates by transmitting a request for objects to a source, receiving at least some of the requested objects from the source, and processing the received objects. The invention uses a frequency down-conversion module that comprises a switch, a capacitor coupled to the switch, and a pulse generator coupled to the switch. The pulse generator outputs pulses to the switch, where the pulses have apertures and cause the switch to close and sub-sample a carrier signal over the apertures. Energy is transferred from the carrier signal and stored using the capacitor during the apertures of the pulses, and a lower frequency signal is generated from the transferred energy.

Abstract: A frequency conversion apparatus having a mixer eliminates phase miss-matching between two intermediate frequency (IF) signals having the same frequency and a 90 degree difference in phase. The frequency conversion apparatus for compensating for phase mismatching of first and second IF signal in response to an RF input signal transmitted through an RF input terminal includes a quadrature signal generator (QSG) outputting first and second oscillating frequency signals having a 90 degre difference in phase, a first mixer mixing the RF input signal with a first resultant frequency signal having a first resultant phase and generated from the first oscillating frequency signal and an inverted signal of the second oscillating frequency signal, and a second mixer mixing the RF signal with a second resultant frequency signal having a second resultant phase and generated from the second oscillating frequency signal and an inverted signal of the first second oscillating frequency signal.

Abstract: A through-the-earth communication system that includes a digital signal input device; a transmitter operating at a predetermined frequency sufficiently low to effectively penetrate useful distances through-the earth; a data compression circuit that is connected to an encoding processor; an amplifier that receives encoded output from the encoding processor for amplifying the output and transmitting the data to an antenna; and a receiver with an antenna, a band pass filter, a decoding processor, and a data decompressor.

Abstract: A satellite broadcast receiver apparatus includes a plurality of signal conversion units provided corresponding to a plurality of signals transmitted from one or more satellites, each signal conversion unit frequency-converting a corresponding signal for output; a signal terminal that can input/output an electrical signal; a signal select circuit provided between the plurality of signal conversion units and the signal terminal to transmit a desired signal among the signals output from the plurality of signal conversion units to the signal terminal in accordance with a control signal applied to the signal terminal; and a power supply control unit controlling voltage supply to the plurality of signal conversion units. The power supply control unit supplies an operating voltage to at least one of the plurality of signal conversion units selected in accordance with information based on the control signal, and suppresses supply of the operating voltage to the remaining signal conversion units.

Abstract: An RF receiver operates to receive broadcast RF signals that include at least one of an analog portion and a digital portion. The RF receiver performs processing of the analog portion and/or the digital portion to generate a digital path signal. The RF receiver performs further processing of the analog portion to generate a first audio signal. A digital modulation processing system may be electrically connected with the RF receiver. The digital modulation processing system may receive and process the digital path signal to generate a second audio signal. The RF receiver may selectively utilize at least one of the first audio signal and the second audio signal to generate an audio output.

Abstract: An apparatus for a direct down-conversion of modulated RF signals, the device including: a first power detector connected between an input port for the modulated RF signal and ground, which outputs a first DC signal, a second power detector connected between an input port for a local oscillator signal and ground, which outputs a second DC signal, the local oscillator signal having the same center frequency as the modulated RF signal, and a third power detector connected between the input port for the modulated RF signal and the input port for the local oscillator signal, which outputs a third DC signal.

Abstract: The present invention provides a method of retransmitting a GPS signal inside a structure. The method includes receiving the GPS signal, amplifying the GPS signal to produce a second GPS signal, and retransmitting the second GPS signal inside the structure either directly or indirectly through an intermediate link in one of the unlicensed bands. The present invention may also be used for the retransmission of digital radio signals inside a structure.

Abstract: In coding and decoding an acoustic parameter, a weighted vector is generated by multiplying a code vector output in a past frame and a code vector selected in a present frame by weighting factors respectively selected from a factor code book and adding the products to each other.

Abstract: In a mixer of a converter, a bipolar transistor is connected between the base of a bipolar transistor and a positive power-supply node within a driving circuit, as a temperature characteristic compensating circuit. When the ambient temperature of the driving circuit rises, collector current of the transistor is increased due to the temperature characteristic of the transistor. This lowers the drain voltage of a high electron mobility transistor. However, collector current of the transistor within the temperature characteristic compensating circuit is also increased, increasing the voltage at a point, so that the increase in the collector current of the transistor is suppressed. This results in a stabilized drain voltage of the transistor. Therefore, the low noise down-converter can supply a stable voltage to a transistor performing frequency conversion, without any effect from the change in the ambient temperature.

Abstract: A method and apparatus for effective through-the-earth communication involves a signal input device connected to a transmitter operating at a predetermined frequency sufficiently low to effectively penetrate useful distances through-the earth, and having an analog to digital converter receiving the signal input and passing the signal input to a data compression circuit that is connected to an encoding processor, the encoding processor output being provided to a digital to analog converter. An amplifier receives the analog output from the digital to analog converter for amplifying said analog output and outputting said analog output to an antenna. A receiver having an antenna receives the analog output passes the analog signal to a band pass filter whose output is connected to an analog to digital converter that provides a digital signal to a decoding processor whose output is connected to an data decompressor, the data decompressor providing a decompressed digital signal to a digital to analog converter.

Abstract: Coherent detection of a received EM signal using universal frequency translation (UFT) is described herein. The received EM signal is sampled according to a sub-harmonic LO signal, where the LO signal is in frequency and phase coherence with the received EM signal. The coherent receiver includes a down-converter/demodulator and a synthesizer/loop filter that are both implemented using UFT technology. The down-converter/demodulator samples the EM input signal using a UFT module according to the coherent sub-harmonic LO signal that is generated by the synthesizer/loop filter. The synthesizer/loop filter generates the coherent LO signal using a phase detector, a loop filter, and an up-converter. The phase detector and up-converter are implemented using UFT modules.

Abstract: A first periodic voltage waveform (20) is downconverted into a second periodic voltage waveform (35, 36). A plurality of temporally distinct samples (SA1, SA2, . . . ) respectively indicative of areas under corresponding fractional-cycles of the first voltage waveform are obtained. The samples are combined to produce the second voltage waveform, and are also manipulated to implement a filtering operation such that the second voltage waveform represents a downconverted, filtered version of the first voltage waveform. The second waveform is driven by an amplifier stage (25), and the second waveform can be advantageously constructed so as to permit the amplifier stage to perform internal resets, offset corrections and other ancillary amplifier stage adjustments without losing information in the first waveform.

Abstract: A receiver for a wireless communication device is disclosed. The receiver comprises a plurality of frequency tines coupled to receive an intermediate frequency signal, each frequency tine of the plurality of frequency tines having a pair of NCOs; a comb filter coupled to the center frequency tine of the plurality of frequency tines; and a comparator circuit coupled to said plurality of frequency tines, the comparator circuit comparing two outputs of the plurality of frequency tines. A method of determining an intermediate frequency in a wireless communication device is also disclosed. The method comprises the steps of providing a plurality of frequency tines for receiving signals at a plurality of different intermediate frequencies; determining an approximate magnitude of a frequency offset from a center frequency; and determining the sign of the frequency offset.

Abstract: A radio receiver architecture is disclosed which has first and second front end circuits optimized for reception in two frequency bands. Each front end circuit includes a mixer for downconverting received signals to a respective intermediate frequency. Signals from the two front end circuits are passed to a single analog-to-digital converter. The sampling rate of the analog-to-digital converter and the intermediate frequencies are chosen such that the received signals appear at the same point in different teeth of the alias response of the analog-to-digital converter.

Abstract: A communications device includes a frequency conversion circuit and a control circuit. An antenna receives a radio signal at a first frequency and converts it into a radio frequency (RF) signal of the first frequency. The frequency conversion circuit is associated with the antenna and configured to convert the RF signal into a first signal component and a second signal component. The first and second signal components occupy a baseband. The control circuit has first ports connected to the frequency conversion circuit to receive the first and second signal components and second ports connected to a processor circuit to output amplified first and second signal components, and separate channels for the first and second signal components existing between the first and second ports. Each channel comprises an amplifier and a feedback loop configured to control the amplifier as a function of a reference signal and a control signal derived from the RF signal.

Abstract: A receiving section has one crystal resonator 122, an inductor 124 able to be connected in series to the crystal resonator 122, and a channel change-over switch 123 for switching whether the inductor 124 is connected to the crystal resonator 122 and the ground, or the crystal resonator 122 is directly connected to the ground, and an adjusting change-over switch 125. A transmitting section has one crystal resonator 321, plural frequency setting adjusting circuits 312,313 each including an inductor 314,316 for determining a frequency oscillated from an oscillator, and a switching connection switch 318 for switching and connecting one of the plural frequency setting adjusting circuits 312,313 to a modulating circuit 320 connected to the crystal resonator 321.

Abstract: The invention provides a signal processing semiconductor integrated circuit of the direct conversion system, which includes a dummy amplifier having the same circuit configuration as a low noise amplifier being the first stage amplifier, in which the DC offset calibrations on the subsequent stage amplifiers are carried out during shifting into the reception mode in a state that the low noise amplifier is deactivated and the dummy amplifier is activated. Thereby, the invention achieves to suppress generation of the DC offsets resulting from the leakage noises of the local oscillator during shifting into the reception mode, and to enhance the reception sensitivity.

Abstract: A tuner includes an input terminal, first to fourth band-pass filters, an automatic gain controller, first to third amplifiers, first and second mixers, first and second voltage controlled oscillators, first and second PLL ICs, a reference oscillator circuit, and an output terminal. The second PLL IC and the reference oscillator circuit are connected through a capacitor and an amplifier. An amplifier for reference oscillation, included in the first PLL IC is connected to the reference oscillator circuit through an inductor that defines an inductance device.

Abstract: In a method of avoiding a band interference wave which is produced in a receiver when a reception frequency used for radio communication is converted into a fixed intermediate frequency by using the oscillation frequency of a local signal oscillator, when the frequency of a reception signal is on the low-frequency side in a reception frequency band, channel setting and route switching control are so performed as to make the reception signal pass through a low-pass filter. A circuit for avoiding a band interference wave is also disclosed.

Abstract: A system and operation of the system for improvement of transmitter and receiver frequency accuracy for a local radio communication unit that communicates digital data with a remote communication unit. In the local unit, received signals are down-converted into complex baseband digital samples by A/D conversion. A downlink digital phase rotator applies a fine frequency shift in accordance with a receiver frequency offset command. The resultant baseband signal is used by the data demodulator and by a receiver frequency error estimator to obtain receiver frequency errors. A data modulator generates baseband complex samples which are shifted in carrier frequency by an integrated uplink digital phase rotator in accordance with a transmitter frequency offset command. The modulated samples are then converted by a D/A converter and upconverted in frequency for transmission to the remote unit.

Abstract: This invention provides a method and system for distributing multiband wireless communications signals. Downlink RF signals in a plurality of downlink frequency bands are received and then combined into a combined downlink RF signal at the main unit. The combined downlink RF signal is subsequently split into multiple downlink RF-parts, which are converted to multiple downlink optical signals and optically transmitted to the remote units. At each remote unit, a delivered downlink optical signal is first converted back to a downlink RF-part which is subsequently separated into a plurality of downlink RF-groups by frequency band. Each downlink RF-group is individually conditioned (e.g., filtered and amplified). The individual-conditioned downlink RF-groups are then combined and transmitted to a dedicated downlink antenna.

Abstract: A direct conversion circuit includes first and second mixers to which a radio frequency signal is input. An oscillator supplies the first and second mixers with local oscillation signals whose phases are orthogonal to each other. A baseband processing circuit processes baseband signals output from the first and second mixers. A level-difference correcting circuit which corrects the two baseband signals input to the baseband processing circuit so that the levels of both are equal to each other is provided in a stage before the first and second mixers. The levels of the baseband signals are corrected by changing relative levels of the radio frequency signal input to the first mixer and the radio frequency signal input to the second mixer.

Abstract: A receiver includes an FFT analysis result/group delay characteristic determining unit for determining whether or not a group of carrier signals of a digital broadcasting signal satisfies predetermined requirements, and delivers a requirement satisfaction determination signal indicating the determining result. When receiving the requirement satisfaction determination signal indicating that the group of carrier signals doesn't satisfy the predetermined requirements while the receiver is selectively receiving the digital broadcasting signal, a switching circuit switches to the reception of an analog broadcasting signal. In contrast, when receiving the requirement satisfaction determination signal indicating that the group of carrier signals satisfies the predetermined requirements while the receiver is selectively receiving the analog broadcasting signal, the switching circuit switches to the reception of the digital broadcasting signal.

Abstract: A single chip direct conversion transceiver that includes a substrate on which a mixer unit and a local oscillator are provided as a circuit, and a positive hole formed between the mixer unit and the local oscillator and filled with a conductive plug to block signal leakage. A shield ground surface is formed above the substrate and blocks signal leakage occurring when the signals received through the antenna are input into the mixer and signal leakage occurring when the reference signal is input into the mixer from the local oscillator. A first interconnection is formed above the shield ground surface and connects the mixer unit and the local oscillator. Dielectric layers are formed between the substrate and the shield ground surface and on the shield ground surface to cover the first interconnection.

Abstract: A communication module includes a variable gain amplifier, a mixer stage responsive to the variable gain amplifier, a post-mixer amplifier stage responsive to the mixer stage, and an off-channel signal detector responsive to the post-mixer amplifier stage. The post-mixer amplifier stage is to produce a first differential signal and a second differential signal. The off-channel signal detector has a first input to receive the first differential signal and has a second input to receive the second differential signal. The off-channel signal detector includes a programmable hysteresis comparator module, and the off-channel signal detector has an output to produce an output signal that indicates whether an off-channel signal condition is detected.

Abstract: Quadrature I and Q signals, which may be generated by a direct conversion radio receiver, are demodulated using an FSK demodulator. The FSK demodulator uses limiter amplifiers to generate rail-to-rail square wave versions of the I and Q signals, which are then selectively connected to data and clock inputs of a register bank comprised of D flip-flops. The outputs of the D flip-flops are polled by a majority vote detector which provides as its output the demodulated modulating bitstream. The FSK demodulator requires no complex analog circuitry and no processing power from a baseband DSP. The FSK demodulator demodulates a modulating bitstream at a minimum modulating index of df/fm>1.

Abstract: A self-calibrating radio is described. In one exemplary implementation, a radio signal from its local voltage controlled oscillator. The calibration system automatically calibrates the radio by: (i) receiving a reference signal having a calibrated reference frequency, (ii) comparing the local frequency to the reference frequency to determine whether there is a difference between the local frequency and the reference frequency and (iii) adjusting the local frequency by an offset frequency, if the difference between the local frequency and the reference frequency is greater than a threshold value.

Abstract: A circuit configuration has a radio-frequency section with a receiving mixing stage, and has a signal processing circuit with an A/D converter, a digital filter and a frequency estimator. The frequency estimator continuously determines a first frequency correction control signal, which is representative of a frequency offset between the frequency of an IF received signal and a frequency which is characteristic of a pass band of the filter. The first frequency correction control signal is used for readjustment of the mixing frequency.

Abstract: In a receiver, either an FM/AM signal to be used for a keyless entry system or a high frequency signal to be used for an automobile audio system for FM broadcast is applied to a first converter. An IF limiter amplifier amplifies the output signal of the converter and subsequently limits the amplitude of the output signal to a predetermined level. An FM detector circuit FM-detects the output signal of the IF limiter amplifier. A stereophonic demodulation circuit demodulates the output signal of the detector circuit. A high frequency signal for AM broadcast is fed to an IF amplifier by way of a second converter. Either the output signal of the IF limiter amplifier or that of the IF amplifier is applied to an AM detector circuit.

Abstract: In a direct conversion receiver, to cancel a DC offset generated in the baseband processing block, negative feedback arrangements comprising a gain control amplifier and a low-pass filter are respectively attached to the I and Q signal branches of the baseband block following mixer outputs. The gain control amplifier in each negative feedback circuit is gain adjusted so that the product G-B of the gain G of a primary gain control amplifier and its own gain B will be constant and thereby the DC offset is cancelled. This DC offset cancellation can be applied in a continuous receiving system with no intermittent time during a receiving operation. Capacitance elements located off-chip can be reduced to those to be used only in the low-pass filters in the negative feedback circuits, whereas many off-chip capacitance elements have been required to be inserted between each stage of gain control amplifiers in conventional baseband chains.

Abstract: This disclosure is directed to techniques that can be executed by a wireless device to perform various signal processing tasks associated with wireless communication. The techniques involve gain state switching based on an output of an analog-to-digital (A/D) converter, rather than gain state switching techniques in which an estimation of signal strength at the antenna is mapped to gain states. Use of the A/D converter output for gain state selection can provide more accurate and dynamic switchpoints.

Abstract: A method and a system for acquiring local signal behavior parameters (LSBPs) of a band-limited (BL) signa, for representing and processing the signal, wherein the LSBPs encode the signal's local behavior in between Nyquist rate points. Preferably, a section of a BL signal within a sampling window is represented as a truncated series of order n at a sampling moment within the sampling window. The truncated series having n+1 LSBPs as its coefficients, encoding the signal's local behavior between Nyquist rate points. Compared to the conventional approach that encodes a signal's behavior by signal samples taken at Nyquist rate points, the invention encodes more signal behavior. Discrete signal samples are obtained from the signal. The LSBPs are solved numerically such that the interpolated values of the truncated series provide the least-square fit with the discrete signal samples.

Abstract: A programmable digital divider operates under the control of a division controller to derive a second synthesized frequency based on a first synthesized frequency. The programmable divider divides the first synthesized signal to derive the second synthesized signal. The division amount is an integer, but varies between integer values if necessary to achieve a non-integer average division value. The majority of the noise generated by the frequency synthesizer is generated away from the centerline frequency and is easily filtered by narrowband filter. The frequency synthesizer may optionally be incorporated into a modified phase-locked loop to generate the second synthesized signal. By using a digital divider, instead of a traditional phase-locked loop, these embodiments allow for integration of the frequency synthesizer onto an integrated circuit, thereby lowering cost and improving resistance to noise spurs. This approach is particularly suited to telecommunications applications.

Abstract: A chip-on-chip-structure semiconductor device for a radio communication device, having a base band chip and a high-frequency chip piled up on and bonded to the surface thereof. The base band chip has a low-frequency signal processing unit for processing a signal in a first frequency band. The high-frequency chip has a high-frequency signal processing unit for processing a signal in a second frequency band of which frequency is higher than that of the first frequency band.

Abstract: A converter operative in a digital telecommunication system to receive signals coded at a first compression mode and convert them into a second compression mode. The conversion provided, leads to substantially less impairments in the decompressed form of the signals converted into the second compression mode, had the signals received been decompressed from the first compression mode into their decompressed form followed by compressing these decompressed signals into the second compression mode, and decompressing the signals thus obtained.

Abstract: A system and method that rejects interference in a direct-sequence spread spectrum communications system. The system and method implement smooth transitions from hop to hop with minimal transient degradation. Adaptive interference suppression is achieved using a suppression filter and an adaptive algorithm that processes the output of the suppression filter and an estimate of the hopping frequency of the interfering signals to switch between interference filter coefficients of the suppression filter. This creates a notch at the carrier frequency of the interfering signals and rejects interference contained in the communication signals. The interference rejection filter hops with the frequency-hopped spread spectrum interfering signals to maintain its interference rejection capability.