Oversampling for Nonlinear Waveshaping: Choosing the Right Filters

Julen Kahles, Fabian Esqueda Flores, Vesa Välimäki

    Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

    9 Sitaatiot (Scopus)
    507 Lataukset (Pure)

    Abstrakti

    An assessment of filters for classic oversampled audio waveshaping schemes is carried out, pursuing aliasing reduction. For this purpose, the quality measure of the A-weighted noise-to-mask ratio is computed for test tones covering the frequency range from 27.5 Hz to 4.186 kHz, sampled at 44.1 kHz, and processed at eight-times oversampling. All filters are designed to have their passband contained within a ±1 dB range and to exhibit a minimum stopband attenuation value of 40 dB. Waveshaping of sinusoids via hard clipping is investigated—spectral enrichment due to the discontinuities introduced by its nonlinear transfer function maximizes aliasing distortion. The obtained results suggest that linear interpolation equalized with a high shelving filter is a sufficiently good method for upsampling. Concerning decimation, the interpolated FIR, elliptic, and cascaded integrator-comb filters all improve the results with respect to the trivial case. The cascaded integrator-comb filter is the only tested decimation filter that achieves perceptually sufficient aliasing suppression for the entire frequency range when combined with the linear interpolator.
    AlkuperäiskieliEnglanti
    Sivut440–449
    Sivumäärä10
    JulkaisuJournal of the Audio Engineering Society
    Vuosikerta67
    Numero6
    DOI - pysyväislinkit
    TilaJulkaistu - kesäk. 2019
    OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

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