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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..