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7573956 |
Time encoding and decoding of a signal
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...
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7433683 |
System for fast macrodiversity switching in mobile wireless networks
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...
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7430235 |
Apparatus for providing a multi-mode interface between a baseband receiver and radio frequency circuitry
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...
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7395042 |
Enhancing signals in a two-way radio system
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...
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7394857 |
Flexible versatile low-cost wireline transmit driver
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...
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7343135 |
Method and apparatus for down conversion of radio frequency (RF) signals
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...
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7313175 |
Method for avoiding interference radiation of AM transmitters used in digital transmission
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...
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7308032 |
Oversampling D/A converter and method for shaping nonlinear intersymbol interference in an oversampling D/A converter
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...
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7305037 |
Calibration system for a communications system
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...
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7280593 |
Method and system for sample and reconstruction synchronization for digital transmission of analog modem signal
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...
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7265702 |
Method for converting an analog signal to multiple different phase outputs utilizing an analog-to-digital converter
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...
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7245655 |
Dual antenna receiver
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...
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7243037 |
Signal processing device, use of the signal processing device and method for signal processing
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...
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7194022 |
Method and system having capacity-dependent baseband gain and coverage-capacity swapping in a multi-carrier base station transmitters
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. A transmission...
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7180950 |
Low-noise feedback cancellation filter for enhanced common-mode rejection and noise immunity
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...
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7151970 |
Multiple audio DACs with PC compatibility
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...
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7130337 |
Method and system for sample and recreation synchronization for digital transmission of analog modem signal
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...
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7075980 |
Digital connection detection technique
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...
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6980789 |
Divider module for use in an oscillation synthesizer
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...
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6973121 |
Repeater system and method of receiving a modulated input signal and transmitting a modulated output signal
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...
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6961547 |
Wireless transmitter incorporating a synchronous oscillator in a translation loop
A translation loop signal upconverter is disclosed. Embodiments of the invention minimize n th order harmonics and spurious tones in the radio frequency output spectrum of a portable transceiver....
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6954490 |
Fully integrated ethernet transmitter architecture with interpolating filtering
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...
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6944212 |
Method and apparatus for the spectrally efficient encoding and decoding of discrete data into and from analog waveforms
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...
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6934324 |
Zero value-detecting circuit
Provided is a circuit that has a simple circuit configuration and can detect zero values in a 1-bit digital signal irrespective of a recording medium such as SACD. DSD data forming the 1-bit...
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6862636 |
Multi-mode speaker operating from either digital or analog sources
A speaker system that detects what type of audio signal is supplied to it and automatically adjusts to reproduce sound from either an analog audio input signal or a digital audio input signal. The...
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6823026 |
Apparatus and method for baseband detection
A baseband detector includes a complex differential detector, a constellation point computer, and a phase shift keying (PSK) decoder. The complex differential detector outputs complex values in...
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6819915 |
Applications of a differential latch
A differential latch includes a sample transistor section, a hold transistor section, a 1 st gating circuit and a 2 nd gating circuit. The sample transistor section is operably coupled to sample,...
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6813310 |
Receiver and IC thereof capable of receiving analog broadcast and digital broadcast
A receiver is equipped with a demodulation circuit for taking a signal indicating broadcast contents of an analog broadcast out of the first and second intermediate-frequency signals, and for...
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6810266 |
Digitally controlled radio back-end
A radio circuit that includes a radio front-end for receiving a radio signal and converting the radio signal to a first intermediate frequency signal and a second intermediate frequency signal. The...
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6771711 |
Digital GMSK filter
A digital GMSK filter for use for frequency modulation of a carrier signal in a GMSK transmission system is described. The GMSK filter uses a large number of individual current sources, whose...
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6747987 |
Transmit modulation circuit and method of operating a transmitter
A transmitter ( 100 ) includes a fractional N synthesizer, a baseband digital modulation stage coupled to the fractional N synthesizer in a first modulation mode, and a baseband I/Q modulation...
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6741659 |
Wireless infrared digital audio transmitting system
A system for transmitting digitized samples of analog signals while concealing unrecoverable digitized samples of analog signals to maintain a level of fidelity in reproducing the analog signals....
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6731677 |
Method and apparatus for carrying digital data as analog video
An interface, e.g., a modem-like interface for converting a digital information signal into an analog signal for use within an analog television studio infrastructure. Namely, the present invention...
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6721352 |
Method and device for detecting the presence of a carrier signal transmitted in the reverse RF path
The present invention provides an improved apparatus and method for detecting a reverse carrier signal. The present invention utilizes a peak detector/envelope filter for determining the peak level...
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6690313 |
Digital-to-analog upconverter
The digital signal is provided to the digital-to-analog upconverter ( 40 ) such as through digital signal processing circuitry ( 70 ). A sample rate signal and a divided sample rate signal are...
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6674382 |
Line driver structures that enhance driver performance
Line drivers are provided that are suitable for driving communication cables (e.g., in Data Over Cable Service Interface Specification (DOCSIS) certified systems) without the need for output...
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6609039 |
Simultaneous multi-user audio re-transmission digital radio module
A digital audio signal processing and distribution sub-assembly unit, plug compatible or integratable with single user digital radios, for audio channels and simultaneous re-transmission to...
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6608860 |
Low power dissipation, high linearity transmitter
An improved transmitter capable of achieving high linearity with minimal power dissipation is disclosed, comprising a digital phase splitter and an output stage. The digital phase splitter includes...
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6584145 |
Sample rate converter
A converter or a resampler used in a digital communication system converts a first digital signal representing an analog signal into a second digital signal representing the same analog signal. The...
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6546044 |
Dual-mode radiotelephone apparatus for digital or analog modulation
A dual-mode radiotelephone capable of operation in analog or digital modes. According to exemplary embodiments, a digital signal processor receives a speech signal to be transmitted in the digital...
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6532258 |
Method for estimating signal-to-noise ratio of digital carriers in an AM compatible digital audio broadcasting system
A method of estimating SNR for a plurality of carriers modulated with digital information, wherein the digital information includes data baud and training baud, comprising the steps of: receiving...
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6510175 |
In-band on-channel digital broadcasting
A system for combining AM and FM transmissions. In-band, on-channel, FM Digital Audio Broadcast (IBOC FM-DAB) allows simultaneous transmission of DAB and FM over existing FM allocations without...
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6480536 |
Method and apparatus for demodulating and equalizing an AM compatible digital audio broadcast signal
A method of demodulation and equalization is used to process an amplitude modulated compatible digital broadcasting signal including an amplitude modulated radio frequency signal having a first...
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6434395 |
Portable communications and data terminal having multiple modes of operation
A portable radio telephone handset includes the capability of operating as a data transfer terminal as well as an analog cellular telephone subscriber station. Two modes of operation are available...
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6408020 |
Dual-mode radio communication device having function for selectively using analog or digital mode
According to the present invention, an analog-mode discharge characteristic storage area ( 21 a ) and a digital-mode discharge characteristic storage area ( 21 b ) store threshold data of remaining...
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6404408 |
Enhanced radio graphic data system
An enhanced radio graphic data system comprises an FM receiver, RDS demodulator and decoder, display, microprocessor and memory. The system incorporates a protocol enhancement of RDS involving the...
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6400758 |
Method and apparatus for training sequence identification in an AM compatible digital audio broadcasting system
A method is provided for identifying a training baud in a digital audio broadcasting signal. The method includes the steps of receiving a plurality of carrier signals modulated by a plurality of...
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6385233 |
Unbalanced quadrature waveform
A method 1100 and apparatus 1200 utilizing unbalanced modulation for providing users in a communication system with different amounts of effective communication energy according to their...
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6373883 |
Radio receiver and a radio transmitter
A radio receiver is adapted to receive radio signals in at least two frequency bands, in which the radio signals are modulated by information signals. The radio receiver includes a device for...
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6370186 |
Signal processing
A circuit is disclosed for sampling analog signals at a rate which is a rational, non-integer fraction of a clock frequency. The analog signal is sampled at non-equidistant sampling points, with...
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