Methods and apparatus for correction of higher order delta sigma converters
Patent 6480129 Issued on November 12, 2002. Estimated Expiration Date: 
February 22, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 22, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPlural-order sigma-delta analog-to-digital converters using both single-bit and multiple-bit quantization Analogue and digital convertors using pulse edge modulators with non-linearity error correction Delta sigma pwm dac to reduce switching Oversampled digital-to-analog converter based on nonlinear separation and linear recombination Correction of nonlinear output distortion in a Delta Sigma DAC Patent #: 6150969 InventorAssigneeApplicationNo. 510034 filed on 02/22/2000US Classes:341/143, Differential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation)341/77, To or from delta modulation codes341/138, Nonlinear341/200QUANTIZERExaminersPrimary: Young, BrianAssistant: Nguyen, Dinh Q. Attorney, Agent or FirmInternational ClassH03M 003/00AbstractA technique for correcting higher order delta sigma modulators in audio components, which use mutually nonlinear feedback and feed forward functions. Methods and apparatus are provided to correct jitter and spread in the delta sigma converter due to quantization error, to permit the processing of data streams entering the converter at a different clock rate from that of the modulator, and to permit step up ratios to be changed on the fly in order to reduce radio frequency interference from the output signal.Other References
Field of SearchDifferential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation)Sampled and held input signal with linear return to datum Sampled and held input signal with nonlinear return to datum ANALOG TO OR FROM DIGITAL CONVERSION QUANTIZER Increasing converter resolution (e.g., dithering) To or from delta modulation codes Nonlinear Linearization (e.g., nonlinear transfer characteristic compensates for nonlinear transducer) | |
