Design of Finite Word Length Linear-Phase FIR Filters in the Logarithmic Number System Domain

Figure 7

Approximation error as a function of coefficient word length for proposed method and direct rounding of the linear relaxation: (a) spec. 3, 𝑁=34, (b) spec. 6, 𝑁=34, and (c) spec. 6, 𝑁=22.

(a)

(b)

(c)