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A Numerical Method to Modify the NBR 10303 Filter Frequency Response

This paper describes the design of three filters used in the filtering of pink noise which are described in the new Brazilian standard proposed to replace the current NBR 10303. The NBR 10303 filter does not permit the correct test of subwoofers because its low cut-off frequency is too high and for this reason we changed its component values in order to obtain three new filters with lower low cut-off frequencies. The design of these filters was carried out through a numerical method based on a modification of the NBR 10303 filter frequency response magnitude. The final component values were specified according to commercial values.

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