Disclosed herein are multi-mode methods and devices for sample generation. An exemplary device for generating an output sample includes an analog-to-digital converter (ADC) for sampling a plurality of input analog signals and producing an ADC output sample. The ADC may include a ADC digital modulator including timing-critical components. A plurality of digital blocks may be coupled to the ADC digital modulator. The exemplary device may include a baseband processor for controlling a plurality of clock inputs. The plurality of clock inputs may drive the ADC digital modulator and the plurality of digital blocks. The baseband processor may be configured to operate in a plurality of modes including a first mode and a second mode. The first mode may include a first mode standby state and a first mode initial operating state. The second mode may include a second mode initial operating state and a second mode standby state.

An analog-to-digital converter comprises a first quantizer arranged for yielding a first digital signal; an error signal generation block arranged for generating an error signal representative of a difference between an analog input signal and the first digital signal; an analog loop filter arranged for receiving the error signal; a second quantizer arranged for receiving an output signal of the analog loop filter and for outputting a second digital signal; a digital loop filter arranged for receiving the second digital signal and for providing an input signal to the first quantizer; and a recombiner block comprising a first recombination and a second recombination filter, and an adder circuit for adding outputs of the first and second recombination filters. The first and second recombination filters are selected to obtain an analog-to-digital converted output signal being less dependent on quantization noise caused by the first quantizer than a first digital signal.

A delta-sigma modulator architecture with idle tone suppression based on injecting an out-of-band signal includes: modulator input circuitry to provide a modulator input signal; modulator loop circuitry to quantize the modulator input signal to generate a modulator output signal at an oversampling frequency, and to provide a feedback signal. Digital filtering circuitry filters the modulator output signal to provide a digital output signal at a data rate frequency related to the oversampling frequency by a defined oversampling ratio. Out-of-band (OoB) signal generator circuitry injects a deterministic OoB injection signal at a defined OoB frequency outside of a target frequency band. The modulator input circuitry combines the analog input signal, the feedback signal, and the OoB injection signal into the modulator input signal. The digital filtering circuitry filters the OoB injection signal. The OoB injection signal can be selectively defined to suppress idle tones generated in the modulator loop circuitry.

A hearing assistive device including an audio processing circuit with an analog-to-digital converter having an integrator integrating a voltage present in the summation point; a comparator comparing an output from the integrator with a reference voltage (V.sub.ref) and outputting a logical level in accordance with the comparison; a feedback loop coupling a feedback signal back to the summation point; and a reference voltage generation circuit being adapted to provide the reference voltage (V.sub.ref) being lower than a power supply voltage (V.sub.battery) and following the decay of the power supply voltage (V.sub.battery) with a predefined margin.

Sigma-delta converters having a sampling circuit are provided. The sampling circuit is actuated such that sampling times are at least partially random.

Method and apparatus for nonlinear signal processing include mitigation of outlier noise in the process of analog-to-digital conversion and adaptive real-time signal conditioning, processing, analysis, quantification, comparison, and control. Methods, processes and apparatus for real-time measuring and analysis of variables include statistical analysis and generic measurement systems and processes which are not specially adapted for any specific variables, or to one particular environment. Methods and corresponding apparatus for mitigation of electromagnetic interference, for improving properties of electronic devices, and for improving and/or enabling coexistence of a plurality of electronic devices include post-processing analysis of measured variables and post-processing statistical analysis.

Method and apparatus for nonlinear signal processing include mitigation of outlier noise in the process of analog-to-digital conversion and adaptive real-time signal conditioning, processing, analysis, quantification, comparison, and control. Methods, processes and apparatus for real-time measuring and analysis of variables include statistical analysis and generic measurement systems and processes which are not specially adapted for any specific variables, or to one particular environment. Methods and corresponding apparatus for mitigation of electromagnetic interference, for improving properties of electronic devices, and for improving and/or enabling coexistence of a plurality of electronic devices include post-processing analysis of measured variables and post-processing statistical analysis.

In accordance with an embodiment, a digital microphone interface circuit includes a delta-sigma analog-to-digital converter (ADC) having an input configured to be coupled to a microphone, a digital lowpass filter coupled to an output of the delta-sigma ADC, and a digital sigma-delta modulator coupled to an output of the digital lowpass filter. The delta-sigma ADC, the digital lowpass filter, and the digital sigma-delta modulator are configured to operate at different sampling frequencies.

Proposed is a sigma-delta modulator circuit. The circuit comprises a loopfilter having at least one integrator or resonator section; and a feed-forward path adapted to provide a feed-forward signal to the output of the at least one integrator or resonator section via a filter.

A device, system and method for improvement of analog/digital conversion. An improved delta sigma-converter including a phase or frequency modulation and demodulation, is used. The improved delta sigma-converter obtains higher gains than traditional Delta Sigma converter, preserving or improving the oversampling and noise shaping gains of these converters.