Archives of Acoustics, 39, 2, pp. 231-242, 2014
10.2478/aoa-2014-0027

Variable Ratio Sample Rate Conversion Based on Fractional Delay Filter

Marek BLOK
Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology
Poland

Piotr DRÓZDA
ADVA Optical Networking Sp. z o.o.
Poland

In this paper a sample rate conversion algorithm which allows for continuously changing resampling ratio has been presented. The proposed implementation is based on a variable fractional delay filter which is implemented by means of a Farrow structure. Coefficients of this structure are computed on the basis of fractional delay filters which are designed using the offset window method. The proposed approach allows us to freely change the instantaneous resampling ratio during processing. Using such an algorithm we can simulate recording of audio on magnetic tape with nonuniform velocity as well as remove such distortions. We have demonstrated capabilities of the proposed approach based on the example of speech signal processing with a resampling ratio which was computed on the basis of estimated fundamental frequency of voiced speech segments.
Keywords: sample rate conversion, offset window method, variable fractional delay filter, variable resampling ratio.
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DOI: 10.2478/aoa-2014-0027

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