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Iterative Method for Natural Sampling

Performance of pure digital audio amplifiers using pulse width modulation (PWM) highly depends on the accuracy of the pulse-coded audio (PCM) signal to PWM modulation sequence conversion. This process implies the recovery of original analog signal values at irregular time instances bearing on a uniformly distributed PCM data only. The recovery, or “natural sampling”, requires interpolation processing giving a trade-off between accuracy of the result and computation speed. In this paper we propose a method for natural sampling providing tunable speed-performance constrains while giving the advantage of easy implementation in VLSI. Cubic polynomial interpolation and iterative solving algorithm, as well as experimental results, are presented in the paper.

Authors: Jang, Seong-cheol; Shimanskiy, Vladislav
Affiliation: Samsung Electronics Co., Ltd.
AES Convention:121 (October 2006) Paper Number:6947 Import into BibTeX
Subject:Amplifiers & High Resolution

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