L-Infinity (Chebyshev) Fractional Delay Filters

• Use Linear Programming (LP) for real-valued $L_\infty$-norm minimization
• Remez exchange algorithm (remez, cremez)
• In the complex case, we have a problem known as a Quadratically Constrained Quadratic Program
• Approximated by sets of linear consraints
  (e.g., a polygon can be used to approximate a circle)
• Can solve with code developed by Prof. Boyd's group
• See Mohonk-97 paper for details.