why do we plot digital filter spectrum on 0 - 0.5 only

Respected sir/ madam I am find out why digital filter spectrum is plotted on 0-0.5 axis on x axis. Your help to understand this will be priceless. T. V. Chandra Shekar

Scilab 02-03-18, 9:11 a.m. chandrashekar
This is the unique frequency range for discrete time systems. After this range, the spectrum starts repeating itself. This behaviour is known as the periodicity.
02-03-18, 9:16 a.m. kannan

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