Applies a double-precision single-channel biquad IIR filter.


void vDSP_biquadD(const struct vDSP_biquad_SetupStructD *__Setup, double *__Delay, const double *__X, vDSP_Stride __IX, double *__Y, vDSP_Stride __IY, vDSP_Length __N);



The vDSP_biquadm_Setup object defining the filter to apply.


An array of double-precision values initialized with “past” state data (elements -2 and -1) for each section of the biquad. After this function executes, this array contains the final state data of the filters. See Discussion below.


An array of double-precision input data for the channel.


Stride for X.


An array to be filled with double-precision output data for the channel.


Stride for Y.


The number of elements to filter.


This function is the same as vDSP_biquad, except for the types of arrays Delay, X, and Y.

See Also

Applying a Single-Channel Biquadratic IIR Filter


Applies a single-precision single-channel biquad IIR filter.