563489578934

AM A c |1+m(t2| e 0, m (t) 7-1
L c m(t2 -1 required for envelope
180°, m (t) 6-1
detection
DSB-SC A c |m(t2| e 0, m (t) 7 0
180°, m (t) 6 0
L Coherent detection required
PM A c D p m(t2 NL D p is the phase deviation constant
(radvolt)
FM A c Df
m(s2 ds NL D f is the frequency deviation constant
L-s
(radvolt-sec)
SSB-AM-SC b A c 2[m(t)] 2 + [ Nm(t)] 2 tan 1 [; Nm (t2m(t2] L Coherent detection required
SSB-PM b A c e ;D pm^ (t)
D p m(t2 NL
mN(s)ds
SSB-FM b A c e ;D f 1t -q
Df
m(s2 ds NL
L- q
21 + m(t) SSB-SQ b A c
1
; 2 lNn [1 + m(t2] NL m(t2 -1 is required so that ln()
will have a real value
SSB-EV b A c |1 + m(t2| ; lNn [1 + m(t2] NL m(t2 -1 is required so that ln()
will have a real value
QM A c 2m 2 1(t) + m 2 2(t)
tan 1 [m 2 (t2m 1 (t2] L Used in NTSC color television; requires
coherent detection
b a A c 0 is a constant that sets the power level of the signal as evaluated by the use of Eq. (4–17); L, linear; NL, nonlinear; [ ˆ ] is the Hilbert transform (i.e., the 90 phaseshifted
version) of []. (See Sec. 5–5 and Sec. A–7, Appendix A.)
b Use upper signs for upper sideband signals and lower signs for lower sideband signals.
c In the strict sense, AM signals are not linear, because the carrier term does not satisfy the linearity (superposition) condition.
t
t
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