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    • 2. 发明公开
    • A SIGNAL PROCESSING METHOD
    • EP4380049A1
    • 2024-06-05
    • EP23020533.8
    • 2023-11-30
    • Oeksound Oy
    • Keskinen, Olli
    • H03G3/00H03G7/00H04R29/00H04R27/00
    • H03G3/002H03G7/007H03G7/002H04R27/00H04R29/007
    • This invention is related to signal processing of music. The invention specifically concerns removal of unwanted artifacts from a music signal. The invention provides a method for attenuating resonances in a sound signal, which method uses subsampling of at least one sub-band of the original signal to save computing resources. As a coarse overview description, the method comprises at least steps in which an incoming signal block is filtered (120) into at least two different frequency sub-band signals, at least one of the sub-band signals is subsampled (121), a resonance analysis step is performed (125) for each sub-band signal, said step resulting in a filter response, a sub-band signal from each sub-band is convolved (130) with the corresponding filter response to produce a filtered sub-band signal, for each subsampled sub-band, the filtered sub-band signal is upsampled (140), and finally the upsampled sub-band signals of subsampled sub-bands and filtered sub-band signals of any non-subsampled sub-bands are combined (150) to form a result signal block. This method saves computing resources by performing analysis based on subsampled sub-band blocks.