!FIR - FIR filter, direct form !IIR - IIR filter, cascade of biquad sections !ALL - All-pole filter, direct form !WIN - Window coefficients, direct form !CAS - Cascade analog biquad sectionsSubsequent lines contain filter coefficients in text form. Data fields are free format, with data values separated by white-space (as defined by isspace). Zero or more data values can appear in each line of input. Commas can also be used to separate data values, but only within a line, i.e. a comma should not appear at the end of a line. A "!" character marks the beginning of a comment that extends to the end of the line.
This routine prints an error message and halts execution on detection of an error.
FI_UNDEF = 0, undefined filter file identifier FI_FIR = 1, FIR filter, direct form FI_IIR = 2, IIR filter, cascade of biquad sections FI_ALL = 3, All-pole filter, direct form FI_WIN = 4, Window coefficients, direct form FI_CAS = 5 Cascade analog biquad sections