Module idsp::hbf

Half-band filters and cascades

Used to perform very efficient high-dynamic range rate changes by powers of two.

Structs

• HbfDec
  Half band decimator (decimate by two)
• HbfDecCascade
  Half-band decimation filter cascade with optimal taps
• HbfInt
  Half band interpolator (interpolation rate 2)
• HbfIntCascade
  Half-band interpolation filter cascade with optimal taps.
• SymFir
  Symmetric FIR filter prototype.

Constants

• HBF_CASCADE_BLOCK
  Max low-rate block size (HbfIntCascade input, HbfDecCascade output)
• HBF_PASSBAND
  Passband width in units of lowest sample rate
• HBF_TAPS
  140 dB stopband, 2 µdB passband ripple, limited by f32 dynamic rangeotherwise like HBF_TAPS_98.
• HBF_TAPS_98
  Standard/optimal half-band filter cascade taps

Traits

• Filter
  Filter input items into output items.