- Pointer to the IIRIIR filter state structure.
- Pointer to the array holding the delay line values. The number of elements in the array isorder. If the pointer isNULL, then the delay line values in the state structure are formed internally to minimize the start-up and ending transients. These values are obtained by matching the initial conditions to remove the DC offset at the beginning and the end of the input vector.
- Indicates no error.
- Indicates an error when thepStatepointer isNULL.
- Indicates an error when the state identifier is incorrect.