# Talk:Linear phase

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## Linear phase ${\displaystyle \nRightarrow }$ symmetrical impulse response

Contrary to what the article current implies, a symmetrical impulse response is not a necessary condition for a discrete-time FIR to be phase-linear (it is merely a sufficient condition). It isn't hard to come up with an example which is asymmetrical, yet linear-phase nonetheless.

However, in the case of continuous-time FIRs (which don't exist in the real world), symmetry is a necessary condition for linear-phase.

Oli Filth 09:24, 13 December 2006 (UTC)

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Is it traditional to exhibit the diagrams with no labels on the axes? If so, there should be a link to an article about the diagrams. No labels makes it hard for the non-expert to interpret . . . —Preceding unsigned comment added by 65.217.188.20 (talk) 16:51, 16 June 2008 (UTC)

It would be helpful to label the axes on the plots here? Are you showing the change in phase as a function of frequency for different filters? A proper description of what was done (code?) to generate the figures here would be helpful. —Preceding unsigned comment added by 147.143.81.22 (talk) 15:23, 24 June 2008 (UTC)