Noise reduction in recursive digital filters using high-order error feedback

摘要: The problem of solving the optimal (minimum-noise) error feedback coefficients for recursive digital filters is addressed in general high-order case. It shown that when minimum noise variance at filter output required, optimization leads to set familiar Wiener-Hopf or Yule-Walker equations, demonstrating can be interpreted as a special case Wiener filtering. As an alternative solution, formulas suboptimal with symmetric antisymmetric are derived. In addition, design using power-of-two discussed. efficiency high order examined by test implementations standard filters. concluded very powerful and versatile method cutting down quantization any classical infinite impulse response (IIR) implemented cascade second-order direct form sections. schemes attractive use >