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Hi, vDSP doesn't provide functions to set the coefficients on a double-precision, single-channel biquadratic filter object. You have two options: either convert your double-precision data to single-precision (see vDSP_vdpsp), or use a double-precision, multichannel biquadratic filter object and set the coefficients with vDSP_biquadm_SetCoefficientsDoubleD..
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Hi, There's an example of using 2D FFT here: [Halftone Descreening with 2D Fast Fourier Transform ](https://developer.apple.com/documentation/accelerate/halftone_descreening_with_2d_fast_fourier_transform). s.