Digital noise-shaping filter with real coefficients and method for making the same
May 7, 2022. 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 ReferencesImplementation and method for a digital sigma-delta modulator Method and apparatus for processing sigma-delta modulated signals Device for digital-analog conversion with high linearity Multilevel analog to digital data converter having dynamic element matching in a reference data path Apparatus for noise shaping a pulse width modulation (PWM) signal and method therefor Methods and apparatus for correction of higher order delta sigma converters Patent #: 6480129 InventorsApplicationNo. 10/069340 filed on 05/07/2002US Classes:341/143, Differential encoder and/or decoder (e.g., delta modulation, differential pulse code modulation)341/141, Multiplex341/144Digital to analog conversionExaminersPrimary: Tokar, MichaelAssistant: Mai, Lam T. Attorney, Agent or FirmInternational ClassH03M 7/36 (20060101)AbstractA digital noise-shaping filter with real coefficients for delta-sigma data converters used in a digital amplifier, 1-bit digital/analog converter, 1-bit analog/digital converter and the like, and a method for making the same. The present digital noise-shaping filter has improved noise suppression performance and system stability and reduced calculation complexity. To this end, the digital noise-shaping filter comprises a noise transfer function expressed by NTF(z)=-1+a1 z-1 +a2 z-2 +Λ+aN z-N. The noise transfer function has optimum real coefficients or real coefficients approximating them.Other References
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