What’s the difference between these two equations? As for single tone, would m(t) simplify to cos(2pie*fm*t)

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What’s the difference between these two equations? As for single tone, would m(t) simplify to cos(2pie*fm*t)
50
1.C.4 Amplitude Modulation with Large Carrier (AM-LC):
Modulation Index and Over-modulation
Consider a message signal m(t) that has a maximum value of Mmax, minimum value of
- Mmax and its AM-LC modulated signal:
g(t) = A (1+ kam(t)) cos(2nfct)
m(t)
Mm
= Ac 1 + μ
μ = kaMmax
max,
cos(2πfct)
Avionics & Cc
(4.3)
Transcribed Image Text:50 1.C.4 Amplitude Modulation with Large Carrier (AM-LC): Modulation Index and Over-modulation Consider a message signal m(t) that has a maximum value of Mmax, minimum value of - Mmax and its AM-LC modulated signal: g(t) = A (1+ kam(t)) cos(2nfct) m(t) Mm = Ac 1 + μ μ = kaMmax max, cos(2πfct) Avionics & Cc (4.3)
AERO250
.
●
1.C.5 Amplitude Modulation with Large Carrier (AM-LC):
Single Tone Modulation and Modulation Index
AM-LC modulation of single tone signals are used in radio navigation aids etc and also provides a
frame of reference.
Avionics & Comms
For a single tone message with amplitude Am, i.e. m(t) = Am cos(2nfmt), the AM-LC modulated
index is
g(t) = Ac(1+ kaAm cos(2nfmt)) cos(2лfct)
= Ac(1 + μ cos (2πfmt)) cos(2nfct)
μ = kaAm
(4.4)
Transcribed Image Text:AERO250 . ● 1.C.5 Amplitude Modulation with Large Carrier (AM-LC): Single Tone Modulation and Modulation Index AM-LC modulation of single tone signals are used in radio navigation aids etc and also provides a frame of reference. Avionics & Comms For a single tone message with amplitude Am, i.e. m(t) = Am cos(2nfmt), the AM-LC modulated index is g(t) = Ac(1+ kaAm cos(2nfmt)) cos(2лfct) = Ac(1 + μ cos (2πfmt)) cos(2nfct) μ = kaAm (4.4)
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