Set of predefined FIR allpass filters suitable for fractional delay filtering. Filter specifications have been relaxed to allow variation of the amplitude in the stop band between 0 and 1 linear scale, but keeping the ripple specification in the passband. When unclear what to select, falp_60dB is recommended.

TFractionalImpulse = (
  falp_160dB,
  falp_140dB,
  falp_140dB2,
  falp_100dB,
  falp_60dB,
  falp_50dB,
  falp_50dB2
);