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http://dx.doi.org/10.6109/jkiice.2012.16.2.253

An Interpolation Filter Design for the Full Digital Audio Amplifier  

Heo, Seo-Weon (홍익대학교)
Sung, Hyuk-Kee (홍익대학교)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.16, no.2, 2012 , pp. 253-258 More about this Journal
Abstract
A computationally efficient interpolation filter with a low-distortion performance is a key component to utilize the naturally-sampled pulse width modulation (NPWM) in a digital domain. To realize the efficient interpolation filter, we propose a novel design based on the recently-proposed modified Farrow filter. The proposed filter shows a better pass-band distortion performance maintaining similar degree of complexity compared with the conventional Lagrange interpolation filter. We achieve the maximum distortion deviation of 10-3 dB to 20-kHz audible frequency range and distortion reduction of 1/6 times compared with the Lagrange interpolation filter.
Keywords
Naturally-sampled pulse width modulation (NPWM); Full digital audio amp; Farrow filter; Interpolation filter;
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