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Patent Issued for Systems, Devices, and Methods for Continuous-Time Digital Signal Processing and Signal Representation

June 25, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Kurchuk, Mariya (Bridgewater, NJ); Weltin-Wu, Colin (Berkeley, CA); Tsividis, Yannis (New York, NY); Morche, Dominique (Meylan, FR); Lachartre, David (Montbonnot, FR), filed on October 12, 2010, was published online on June 10, 2014.

The assignee for this patent, patent number 8749421, is The Trustees of Columbia University in the City of New York (New York, NY).

Reporters obtained the following quote from the background information supplied by the inventors: "Converting analog signals into digital signals is typically done using discrete-time sampling in an analog to digital converter. This involves measuring the signal at regular, discrete time intervals. There are a number of disadvantages in using discrete-time digital signals. For example, in conventional discrete-time digital signal processors (DSP), the clock signal that triggers the sampling runs at a frequency that is at least twice the highest frequency of interest in a signal. This clock has to run continually at that frequency even if there is no signal or there is no high-frequency component that needs to be processed, and this can result in a significant waste of power.

"In addition, conventional DSPs suffer from aliasing and quantization error. Aliasing occurs because the input signal mixes with the clock frequency, resulting in distortion that is present when the signal is reconstructed from the samples. Quantization error is produced by the inaccuracies inherent in turning the continuous amplitude range of an analog input signal into the discrete levels of a digitized signal, and these errors can be spread across all frequencies in a conventional DSP. Techniques such as dithering and non-uniform sampling may reduce or modify one or both of these undesired effects, but residual aliasing and/or quantization noise typically remains even after applying such techniques."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "In some embodiments, a system for continuous-time signal processing is disclosed. The continuous-time signal processing system includes a continuous-time analog-to-digital converter that is configured to receive an analog input signal, determine time points at which the analog input signal crosses each quantization level of a plurality of defined quantization levels, produce a digital signal for each quantization level, the digital signal having a value that changes at the determined time points of the quantization level, and produce, for the digital signal of at least one of the quantization levels, a plurality of transition signals based on transitions of the value of the digital signal, and a continuous-time digital signal processor coupled to the continuous-time analog-to-digital converter and configured to process the plurality of transition signals of each quantization level to produce processed digital signals.

"In certain embodiments, a method for continuous-time signal processing is disclosed that includes receiving an analog input signal at a continuous-time analog-to-digital converter, determining time points at which the analog input signal crosses each quantization level of a plurality of defined quantization levels, producing a digital signal for each quantization level, the digital signal having a value that changes based on the analog input signal crossing the quantization level, producing, for the digital signal of at least one of the quantization levels, a plurality of transition signals based on transitions of the value of the digital signal, and processing the plurality of transition signals of each quantization level in a continuous-time digital signal processor to produce processed digital signals.

"In yet other embodiments, a wide-band receiver system is disclosed. This system includes a low noise amplifier configured to receive and amplify an analog input signal, a continuous-time analog-to-digital converter that is configured to receive an analog input signal, determine time points at which the analog input signal crosses each quantization level of a plurality of defined quantization levels, produce a digital signal for each quantization level, the digital signal having a value that changes at the determined time points of the quantization level, and produce, for the digital signal of at least one of the quantization levels, a plurality of transition signals based on transitions of the value of the digital signal, a continuous-time digital signal processor coupled to the continuous-time analog-to-digital converter and configured to process the plurality of transition signals of each quantization level to produce processed digital signals, an analog summation circuit configured to convert the processed digital signals into analog signals and sum the analog signals to produce an analog output signal, and an asynchronous detector coupled to receive the analog output signal from the summation circuit and convert the analog output signal into a digital output signal."

For more information, see this patent: Kurchuk, Mariya; Weltin-Wu, Colin; Tsividis, Yannis; Morche, Dominique; Lachartre, David. Systems, Devices, and Methods for Continuous-Time Digital Signal Processing and Signal Representation. U.S. Patent Number 8749421, filed October 12, 2010, and published online on June 10, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8749421.PN.&OS=PN/8749421RS=PN/8749421

Keywords for this news article include: Electronics, Digital Signal Processing, The Trustees of Columbia University in the City of New York.

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Source: Electronics Newsweekly


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