Explain amplitude modulation for more than one modulating signal in the following cases - (i) Mathematical equation - (ii) AM waveform - (iii) AM amplitude and power spectrum - (iv) Modulation Coefficient - (v) Transmission Power -

Mumbai University > Computer Engineering > Sem 3 > Electronic Circuits and Communication Fundamentals

Marks: 10 Marks

Year: Dec 2015

i. Mathematical Equation

The instantaneous values of modulating signal and carrier signal can be represented as given below.

Instantaneous value of modulating signal

$$e_m=E_m\sin w_mt$$

where $e_m=\text{instantaneous amplitude} \\ E_m =\text{maximum amplitude} \\ w_m =2πf_m=\text{angular frequency and} \\ f_m =\text{frequency of modulating signal}$

Instantaneous value of carrier signal

$$e_c=E_c\sin w_ct$$ …