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This section illustrated the design of optimal spectrum-analysis windows made using linear-programming (linprog in matlab) or Remez multiple exchange algorithms (firpm in Matlab). After formulating the Chebyshev window as a linear programming problem, we found we could impose a monotonicity constraint on its shape in the time domain, or various derivative constraints. In Chapter 4, we will look at methods for FIR filter design, including the window method4.5) which designs FIR filters as a windowed ideal impulse response. The formulation introduced in this section can be used to design such windows, and it can be used to design optimal FIR filters. In such cases, the impulse response is designed directly (as the window was here) to minimize an error criterion subject to various equality and inequality constraints, as discussed above for window design.4.16

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