Design and Implementation of Optimal Noise Shaping Filters

Abstract:

Article Preview

When re-quantize a signal of low levels, serious distortion may occur due to word length reduction. Adding proper dither before re-quantization can improve the quantization error characteristic, while it will increase overall noise. By applying noise shaping, transposing most of the noise power to the band which human ear is less sensitive can reduce audible noise and thus improve auditory sense. This paper firstly discussed the applications of dither and noise shaping in professional digital audio, according to human ear’s psychoacoustic properties, by adopting genetic algorithm, fulfilled the design of psycho-acoustically optimal noise shaping filter. Then it applied the noise shaping technology to upsampling processing, realized the optimal noise shaping filter design under oversampling condition. Finally, it performed algorithm simulation on mat lab platform. Actual listening test confirms that by combining noise shaping technology with upsampling technology, sound quality can be improved significantly.

Info:

Periodical:

Edited by:

Chunliang Zhang and Paul P. Lin

Pages:

2163-2166

Citation:

J. L. Zhou and Z. Y. Zhu, "Design and Implementation of Optimal Noise Shaping Filters", Applied Mechanics and Materials, Vols. 226-228, pp. 2163-2166, 2012

Online since:

November 2012

Export:

Price:

$38.00

[1] Christopher Hicks. The application of Dither and Noise-Shaping to Nyquist-Rate Digital Audio: an Introduction,. cmh@eng. cam. ac. uk. September 12, (1995).

[2] Robert A. Wannamaker. Psycho-Acoustically Optimal Noise Shaping,. Presented at the 89th AES Convention, Log Angeles, September 21-25, 1990, preprint 2965.

[3] Stanley P. Lipshitz, John Vanderkooy, and Robert A. Wannamaker. Minimally-Audible Noise Shaping, J. Audio Eng. Soc. 39(11): 836-852, (1991).

[4] VERHELST W. AND D. DE KONING. NOISE SHAPING FILTER DESIGN FOR MINIMALLY AUDIBLE SIGNAL REQUANTIZATION,. IEEE Workshop on Application of Signal Processing to Audio and Acoustics(New Platz, NY , October21-24, 2001). p.147.

DOI: https://doi.org/10.1109/aspaa.2001.969564

[5] Stanley P. Lipshitz and John Vanderkooy. Why 1Bit Sigma-Delta Conversion is Unsuitable for High-Quality Applications,. Presented at the 110th Convention of Audio Engineering Society, May 12-15 (2001).

[6] Dejan G. Ćirić, Miloš Marković, Branko Stojić. Improvement in design of noise shaping filters,. Cent. Eur. J. Eng. 2(2): 224-230, (2012).

DOI: https://doi.org/10.2478/s13531-011-0068-8