Phase and Group Delays To develop the necessary expression, consider a discrete-time signal xn obtained y a double-sideband suppressed carrier (DSB-SC) modulation with a carrier frequency o of a low-frequency sinusoidal signal of frequency o xn=acos(oon cos(ocn) Copyright C 2001, S K MitraCopyright © 2001, S. K. Mitra 5 Phase and Group Delays • To develop the necessary expression, consider a discrete-time signal x[n] obtained by a double-sideband suppressed carrier (DSB-SC) modulation with a carrier frequency of a low-frequency sinusoidal signal of frequency : o c x[n] Acos( n)cos( n) = o c