A linear phase filter has the unique property that the delay from input to output is constant across all input frequencies (that is, constant group delay). The constant delay property is independent of the nature of the input signal (impulse or swept-tone), and therefore the phase is linear across frequency, which can be important when analyzing multitone signals. However, as shown in Figure 7-17, the group delay is longer for the linear phase filter compared to minimum phase. For both the linear and minimum filters, fully settled data are available 62 conversions after a step input change occurs.

Figure 7-17 FIR Step Response