Both opcodes are normative, in the sense that the filter coefficients parameters define the transfer function of the filter, assuming one opcode call per a-pass. The method for implementing this transfer function is non-normative. The firt opcode specifies the FIR filter coefficients as the table parameter t , whose length is the order of the filter. If the optional k-rate parameter order is less than the table length, this parameter determines the filter order, as specified on the right panel. Exact implementation is decoder dependent.
Exact implementation is decoder dependent.
See the right panel for header syntax for these opcodes. Both opcodes return a filtered version of the signal provided by the a-rate parameter in . During the first call to these opcodes, the internal filter state variables are initialized to zero. The iirt opcode specifies the transfer function coefficients as two wavetables, table b for numerator coefficients and table a for denominator coefficients. These opcodes are normative in the sense that the coefficients supplied as parameters define the filter transfer function, assuming one opcode call per a-pass.