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7630445 |
Establishing slot boundaries of slots of a diversity control feedback signal
Establishing slot boundaries includes receiving a feedback signal reflecting feedback information describing a signal modified according to a diversity parameter adjustment. The feedback signal...
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7605737 |
Data encoding in a clocked data interface
One embodiment of the present invention includes a data transmission system. The system comprises a data transmitter that provides a plurality of data bits over at least one data line. The data...
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7561635 |
Variable coder apparatus for resonant power conversion and method
A noise-shaping coder with variable or reconfigurable characteristics is disclosed. In one exemplary embodiment, an improved apparatus for signal modulation is disclosed. The apparatus generally...
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7450648 |
Digital signal processing device, a method and a delta-sigma modulator using the same method
A signal processing device uses a ΔΣ modulator having varying effective orders to ensure an S/N ratio by selecting a high order when a 1-bit music signal is output via the ΔΣ modulator. The...
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7430239 |
Bit-detection arrangement and apparatus for reproducing information
A preprocessing unit converts an analog signal to a processed signal at a sample rate controlled by a first clock signal. A digital phase locked loop locks on the processed signal and outputs a...
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7385538 |
Delta sigma modulator with multiple filters
Methods and devices for an improved delta sigma modulator. The delta sigma modulator has multiple filters with at least one high order filter processing the MSBs of the quantizer fractional output...
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7310382 |
Linearized switch-based power amplifier
A power amplifier comprises a level-discretization modulator ( 210 ) and a mixing and amplifying stage ( 225 ), in combination with a properly designed negative feedback path. The feedback path...
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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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7292171 |
Method and device for the version of digital signals with heterogeneous formats and application thereof to the digital amplification of audio signals
The invention relates to a method and device for the conversion of digital signals comprising a phase involving modulation with the aid of a vector lattice encoder. The inventive method comprises...
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7289565 |
Multiple description coding communication system
A method and apparatus reliably encode and decode information over a communication system. The method includes transforming two coefficients into two pairs of random variables, one random variable...
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7266152 |
Digital signal processing device and digital signal processing method
A device for performing predetermined processing on an input signal that may have a signal amplitude of more than one bit. The input signal is obtained by subjecting one-bit serial signals to...
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7257164 |
Class D amplifier
The present invention relates to Class-D amplifiers, and in particular to bit-flipping sigma-delta modulator (SDM) implementations of such amplifiers. Such amplifiers are particularly although not...
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7236112 |
Self-tuning output digital filter for direct conversion delta-sigma transmitter
A self-tuning filter that is well suited for use as a output digital filter in a direct conversion delta-sigma transmitter is constructed as a high pass finite impulse response filter having a...
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7227482 |
Complex band-pass filter for use in digital radio receiver and complex band-pass Δ-Σ AD modulator using the same
In a first-order complex band-pass filter, multiplexers are alternately switched over between time intervals of phases A and B, where the multiplexers includes two multiplexers provided at input...
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7224757 |
Method and apparatus for improving the performance of delta-sigma modulators
A delta-sigma modulator that provides improved SNR performance in applications such as low-power mobile wireless communications and high frequency radar applications is disclosed. Multiple...
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7194036 |
Digital data processing circuits and systems with delta-sigma modulator filtering
A method of processing a digital data stream in a digital processing system includes filtering the digital data stream being processed through a delta-sigma modulator having a selected signal...
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7145954 |
Method and apparatus for mapping pulses to a non-fixed layout
A coding method, specifies temporal and/or non-temporal pulse characteristics, where pulse characteristic values are relative to one or more non-fixed reference characteristic values within at...
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7136420 |
Recording of super-audio or like one-bit-per-sample signals on a PCM recorder
An eight-channel PCM recorder is utilized for recording two channels of delta-sigma modulated audio signals. Employed to this end is a PCM adapter comprising a bit stream divider for dividing the...
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7116721 |
Delta-sigma modulators with integral digital low-pass filtering
A feedback noise-shaper of an order of at least three implements a first pole set defining a signal transfer function of a selected corner frequency and a second pole set having at least one pole...
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7113118 |
Digital signal encoding apparatus and method, digital signal decoding apparatus and method, and digital signal transmission system
A signal encoding apparatus encodes one-bit signals of a plurality of n channels in a delta-sigma manner. The apparatus includes a phase modulator for phase-modulating the one-bit signals as...
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7110460 |
Delta-sigma modulators with integral digital low-pass filtering
A delta-sigma modulator of an order of at least three having a signal transfer function defining a signal low-pass response, the signal transfer function has a numerator and a denominator, the...
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7098828 |
Complex band-pass ΔΣ AD modulator for use in AD converter circuit
A complex band-pass ΔΣ AD modulator is provided with a subtracter device, a complex band-pass filter, first and second AD converters, and first and second DA converters. The first and second DA...
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7075995 |
Three-order sigma-delta modulator
A three-order sigma-delta modulator having a feedback and a feedforward configuration. The three-order sigma-delta modulator includes: an analog-to-digital converter; a digital-to-analog converter;...
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7054372 |
Digital transmission line tap circuit
A digital transmission line tap circuit is provided for applying a non-intrusive tap on a digital transmission line thus allowing the transmission signal to be monitored or utilized by another...
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7034727 |
Bandpass sigma-delta modulator
A bandpass sigma-delta modulator using acoustic resonators or micro-mechanical resonators. In order to improve resolution at high frequencies, acoustic resonators or micro-mechanical resonators are...
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7034728 |
Bandpass delta-sigma modulator with distributed feedforward paths
A delta-sigma modulator. The novel delta-sigma modulator includes one or more filter stages arranged in cascade, wherein each filter stage includes a first circuit for generating a first output...
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7016421 |
Time-interleaved delta sigma analog to digital modulator
A Delta-Sigma Analog-to-Digital Converter (ADC) that can have a very high sampling rate (over 100 GHz) and which is preferably optically sampled to help achieve its very high sampling rate. The...
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6975682 |
Multi-bit delta-sigma analog-to-digital converter with error shaping
A quantizer adapted for use with a delta-sigma analog-to-digital converter. The quantizer includes first and second comparators adapted to compare an input analog signal to a threshold and provide...
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6970753 |
Storage and transmission of one-bit data
Apparatus for storing or transmitting a one-bit digital signal comprises an input inverter for inverting a subset of the data bits of an input one-bit digital signal, to generate a bit-inverted...
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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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6920182 |
Delta-sigma modulator system and method
The invention discloses a system and method for improving the out-of-band noise response of a multi-order delta-sigma modulator. The system and method includes programmable delta-sigma modulators...
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6874045 |
Digital signal processing apparatus and processing method, and digital signal reproduction/reception system
A digital signal processor receives 1-bit audio signals acquired by sigma modulation and sent over a predetermined transmission line and makes a changeover between the audio signal and a mute...
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6861968 |
Signal processing system with baseband noise modulation and noise filtering
A digital-to-analog converter (“DAC”) system utilizes notch filters and chopping modulation technology to remove l/f and other baseband noise from a baseband of a signal of interest. Chopping...
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6853633 |
Methods of providing signal parameter information using delta-modulation and related systems and terminals
Signal parameter information can be transmitted from a first communications device to a second communications device. For example, communications can be received at the first communications device...
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6839387 |
Self-dithering sigma-delta converter and communication device incorporating same
A sigma-delta converter operates over a predetermined bandwidth and includes a feedback loop comprising a forward path and a feedback path. The forward path includes, in series, a summer, a filter,...
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6823019 |
Reduced DC transients in a sigma delta filter
DC transients are removed from a digital filter such as a sigma delta filter (in particular from a sigma delta high pass filter) from the outset by presetting an input summing node to a sigma delta...
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6765445 |
Digitally-synthesized loop filter circuit particularly useful for a phase locked loop
In a feedback system such as a PLL, the integrating function associated with a loop filter capacitor is instead implemented digitally and is easily implemented on the same integrated circuit die as...
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6748025 |
Direct conversion delta-sigma receiver
A wireless receiver receives a wireless signal by inverting the polarity of an incoming waveform on every one half clock cycle of a conversion clock to produce a commutated waveform and converting...
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6727833 |
Adaptive &Sgr &Dgr modulation with one-bit quantization
An adaptive sigma delta modulator has an input stage, a conventional sigma delta modulator, and adaptation stage, and an output stage. The input stage produces a difference signal representing the...
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6639946 |
Sigma delta modulator with SAW filter
A sigma delta modulation device and method for filtering high frequency intermediate frequency signals. A summing amplifier receives the analog intermediate frequency signal, and provides to a...
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6636566 |
Method and apparatus for specifying pulse characteristics using a code that satisfies predefined criteria
A coding method for a pulse transmission system specifies temporal and/or non-temporal pulse characteristics according to temporal and/or non-temporal characteristic value layouts having one or...
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6636567 |
Method of specifying non-allowable pulse characteristics
A code specifies characteristics of pulses transmitted and received by an impulse transmission system. The invention provides methods for defining non-allowable regions within pulse characteristic...
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6628720 |
Transmitting apparatus and reproducing apparatus
A transmitting apparatus and a reproducing apparatus include a converter for converting an input one-bit digital signal into a multi-bit signal while effecting down-sampling of a sampling...
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6600789 |
Signal processing method and device
The invention relates to digital signal processing and specifically to level control of a pulse density modulated (PDM) signal generated by a sigma-delta modulator. A single-bit pulse density...
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6600788 |
Narrow-band filter including sigma-delta modulator implemented in a programmable logic device
A narrow-band bandpass filter is implemented in a field programmable gate array (FPGA). An analog-to-digital converter quantizes an input analog signal with a high degree of precision to produce...
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6584157 |
Receiver having integrated mixer and Sigma-Delta analog-to digital conversion
A receiver with an integrated mixer/Sigma-Delta Modulator configuration for digitizing a relatively low-bandwidth signal modulated on a high-frequency carrier, for example in a radio receiver. The...
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6567491 |
High efficiency line driver for high crest-factor signals such as DMT/ADSL signals
The present invention, generally speaking, achieves a highly efficient line driver for high crest-factor signals such as DMT/ADSL signals. In an exemplary embodiment, a digital signal produced by a...
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6535153 |
Adaptive sigma-delta modulation with one-bit quantization
An adaptive sigma delta modulator has an input stage, a conventional sigma delta modulator, and adaptation stage, and an output stage. The input stage produces a difference signal representing the...
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6489909 |
Method and apparatus for improving S/N ratio in digital-to-analog conversion of pulse density modulated (PDM) signal
A method and apparatus for improving an S/N ratio in a digital-to-analog conversion of a PDM signal are provided. A digital-to-analog conversion system comprises an S/N ratio improving section. The...
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6445736 |
GSM baseband receiver arrangement using digital signal processing
GSM baseband receiver arrangement using digital signal processing is disclosed. The baseband receiver arrangement comprises two channel for inphase (I in ) and quadrature (Q in ) components of the...
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