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7577193 |
Adaptive equalizer
Some embodiments of the invention include apparatus, systems, and methods to adjust a clock generator and an equalizer to reduce jitter in an output signal. A phase detector provides feedback...
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7545859 |
Adaptive channel equalization technique and method for wideband passive digital receivers
An adaptive channel equalization technique and method for wideband passive receivers is disclosed that reduces and tends to minimize distortions caused by circuitry within passive digital...
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7535816 |
Waveform equalizer and information reproducing apparatus therewith
A waveform equalizer includes: a calculation circuit ( 7 a ) that permits free setting of the boost factor by which the gain, in a predetermined frequency range, for the input signal by varying the...
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7529296 |
Adaptive equalization method and circuit for continuous run-time adaptation
In some embodiments disclosed herein, equalizers in a receiver are adapted during normal operation, as they extract bit data from a received bit stream, to account for channel and/or circuit...
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7504906 |
Method for manufacturing an equalizer
A method for manufacturing an equalizer. The method first acquires a transmission line scattering-parameter, and a gain of the transmission line scattering-parameter at a frequency
1 π ...
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7492817 |
Adaptive digital filter
An adaptive digital filter includes a filtering circuit and a coefficient renewal circuit. The filtering circuit has a coefficient a defined by a fundamental formula:...
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7453932 |
Test device and setting method
A testing apparatus for testing a device under test is provided, wherein the testing apparatus includes: a comparator for receiving a signal output from the device under test and converting the...
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7446622 |
Transmission line with low dispersive properties and its application in equalization
A transmission line is provided with added shunt resistance, R SH , distributed along the length of the micro transmission line permitting the extension of constant characteristic impedance to the...
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7443913 |
High speed decision feedback equalizer
An equalizer comprises a sampler, a filter, and a summer. The sampler samples a signal indicative of an input communication signal to determine digital decision output signals having a...
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7440035 |
Cable extending device
Attenuation compensation volume computing means ( 60, 61, 62, 63, 67, 68, 69, 70 ) of a signal receiver computes attenuation compensation volume of a video signal (G L , G H ) on the basis of...
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7424053 |
Channel equalization in data receivers
Channel equalization in a 1000BASE-T receiver is performed by a fixed mode analog filter 2 suitable for the longest possible cable length, by a FFE ( 3 ), and by a digital filter 4 . The digital...
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7394331 |
Programmable passive equalizer
Embodiments of a programmable passive equalizer are described herein.
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7369607 |
Multicarrier communication using a time domain equalizing filter
Various methods and apparatus are described that use a filter. A receiver may be configured to receive multi-tone signals. The receiver has a Time Domain Equalizer filter employing an algorithm to...
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7312833 |
Channel equalizing apparatus and method for digital television receiver
Disclosed is a channel equalizing apparatus and method for a digital television receiver that performs channel equalization using equalizing algorithms. The channel equalizing apparatus includes a...
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7301997 |
Method and apparatus for improved high-speed adaptive equalization
A method and apparatus for improved high-speed adaptive equalization that may operate effectively even in systems experiencing severe interference by using one or more error generators and taking...
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7298207 |
Automatic gain control for a multi-stage gain system
Systems and methods are disclosed for providing automatic gain control of a multi-stage system. A method can include defining at least one parameter that is adapted to at least one of maximize...
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7289557 |
Adaptive equalization using a conditional update sign-sign least mean square algorithm
An adaptive equalizer finite impulse response (FIR) filter for high-speed communication channels with modest complexity, where the filter is iteratively updated during a training sequence by a...
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7289007 |
Temperature compensated variable tilt equalizer
A temperature compensated variable tilt equalizer configured to operate over a defined frequency range. The equalizer includes an RF input, an automatic temperature compensation circuit and a...
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7283586 |
Adaptive equalizer matched filter error metric concept and apparatus
A correlative error detection system ( 60 ) for a signal equalizer ( 10 ) that corrects a distorted communications signal. The detection system ( 60 ) correlates a sequence of bits in a signal from...
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7272187 |
Filter circuit and radio apparatus
A distributor 103 distributes an input signal into two lines of distributed signals with equal amplitudes and equal phases. Buffers 104, 105 suppress interference between distributed signals...
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7254171 |
Equaliser for digital communications systems and method of equalisation
Equalisation of a communication channel is achieved through use of a Wiener filter frequency response mechanism that operates to transform at least a portion of a data stream generated from a...
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7230989 |
System and method for processing digital visual interface communication data signals and display data channel communication signals over a transmission line
A digital communication system for transmitting and receiving Digital Visual Interface (DVI) communication data signals and Display Data Channel (DDC) communication signals over a transmission line...
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7206341 |
System and method for providing equalization in a multiphase communications receiver
A circuit and method for receiving digital signals are disclosed. The circuit includes an input connected to a communications channel over which a digital signal is communicated and operates a...
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7180998 |
Regulator for impedance balance of a transmission wire pair
The present invention relates to a regulator for impedance balancing of first ( 104 ) and second wires ( 106 ) of a transmission wire pair having respective first and second impedances, the regular...
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7167513 |
IQ imbalance correction
An in-phase and guadrature (IQ) imbalance error-correction method includes estimating, on the basis of a constellation error in a received orthogonal frequency division multiplexing (OFDM) signal,...
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7099385 |
Compensation for interference in data receivers
A data communication receiver comprises an equalizer for adapting to each of a plurality of channels to open the eye for each channel in a Gigabit (1000BASE-T) transceiver. The eye is open for a...
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7065134 |
Adaptive equalizer with large data rate range
An adaptive equalizer with a large data rate range is provided. The equalizer comprises an equalizer core, a slicer and an automatic gain control (AGC) loop. The equalizer core is coupled to an...
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7053732 |
Multi-bit time delay adjuster unit for high RF applications and method
A multi-bit time-delay adjuster with Radio Frequency (RF) MicroElectroMechanical (MEM) switches may be used in MultiCarrier Power Amplifiers (MCPAs) with a feed-forward linearization technique. The...
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7042937 |
Hybrid frequency-time domain equalizer
A channel decoder employs a hybrid frequency-time domain equalizer for effectively combining a frequency domain equalizer with a time domain equalizer to achieve superior static and dynamic...
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7039942 |
Pad adjustable equalizer for two way cable transmission
A forward signal equalizer for a forward amplifier for two-way coaxial cable systems, of the type having a distribution center distributing forward signals, and having reception facilities for...
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7002427 |
Filter trimming
An adjustable phase shifter generates a phase shifted reference signal by introducing a phase shift in a reference signal. A phase detector identifies a phase difference between the reference...
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6995627 |
Transmitter equalization method and apparatus
A current mode output driver includes a pre-driver for pre-equalization. The current mode output driver drives a transmission line with an alternating current (AC) signal and a direct current (DC)...
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6930567 |
Transmission system
The present invention provides a transmission system having a signal source which has an internal resistance, having a signal transmission line ( 102 ), one end of which is connected to the signal...
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6804293 |
Method for equalising a receive signal
The invention relates to a method for equalizing a signal with a frame structure, received via a time-variable transmission channel. According to said method, a frame-type equalization is used. The...
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6781521 |
Filters for canceling multiple noise sources in borehole electromagnetic telemetry system
An electromagnetic borehole telemetry system providing improved signal to noise ratio. Adaptive filters use noise channels as references to remove noise from the signal channel. Multiple noise...
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6744330 |
Adaptive analog equalizer
Adaptive analog equalization. The present invention provides an analog equalization solution that is assured to converge irrespective of the initial conditions of the adaptation. For very high...
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6717986 |
Error propagation detection and control method, and memory device using the same
An error propagation detection method and apparatus for use in decision feedback equalization type detection is disclosed, with which it is possible to detect error propagation even when a specific...
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6606013 |
Equalizing device for cable distribution network
The invention relates to an equalizing device ( 62 ) intended to be used in a signal processing device ( 30 ) of a cable distribution network ( 1 ). The equalizing device according to the invention...
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6580322 |
Dynamic switching frequency control for a digital switching amplifier
A switching amplifier is described which includes an input stage having a first node associated therewith and a power stage having a second node associated therewith. An actual loop delay is...
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6574576 |
Equalizer with auto-calibration and self-test
In the present invention, a transmission line length estimation circuit with continuous feedback equalizer is provided. The transmission line length estimation circuit comprises a DC bias circuit...
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6571393 |
Data transmission system
A data transmission system is proposed, for example for video-on-demand, internet or multimedia applications, in which a number of subscribers in a building are connected to a central server...
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6549088 |
Frequency adjustable multipole resonant waveguide load structure
A resonant waveguide load structure is provided for use in waveguide systems. The load structure includes a length of waveguide which is open at one end and closed at the other end. The load...
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6546047 |
Methods and circuits for optimal equalization
Methods and circuits utilizing a two stage adaptation algorithm to determine the optimal code for an equalizer to compensate a received signal is disclosed. In the first stage, a coarse tuning...
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6531931 |
Circuit and method for equalization of signals received over a communication system transmission line
A circuit and method for equalization of a communication signal received over a communication system transmission line using switched filter characteristics. Equalization for frequency-independent...
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6501792 |
Serial digital data communications receiver with improved automatic cable equalizer, AGC system, and DC restorer
A serial digital data communications receiver with an improved automatic cable equalizer that is less susceptible to jitter and has greater multi-standards capability, and an improved automatic...
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6452975 |
Method and apparatus to transmit signals over a cable
A method of transmitting signals on a cable comprises filtering the signals at a transmitter to compensate for nonuniform frequency response of the cable at a maximum cable length, and clipping the...
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6396548 |
System and method for multimode operation of a digital filter with shared resources
There is disclosed a digital filter cell capable of processing in a first mode a first signal having real data components only and processing in a second mode a second signal having real data...
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6332000 |
Time division equalizer using system clock signal faster than symbol clock signal in high-speed communication
An equalizer according to the present invention includes a plurality of switch elements for selecting output data from the delaying elements in response to the odd and even clock signals. The odd...
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6327302 |
Fast adaptive equalizer for wireless communication systems
A method and apparatus to accomplish fast adaptive equalization of a wireless communication channel is disclosed. The equalization method and apparatus utilize time varying adaptive filter...
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6307444 |
Frequency signal equalizing device, specially for a satellite communications facility
An arrangement is described for the equalization of a frequency signal, the arrangement including a channel filter and an equalizer connected downstream of the channel filter, for a satellite...
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