Amplitude modulation

212

03:19:55

The modulated wave equation is like this:  (p+m*cos(y))*cos(x), where x is the pulsation of the carrier and y of the modulating wave, 
p is the carrier amplitude and m the modulating wave amplitude. 
First member of multiplication between brackets represents the amplitude of the modulated resulting wave.
The quantity m/p is the modulation depth. 
But due the trigonometric law cosx*cosy = 1/2*[cos(x-y)+cos(x+y)] the first equation become the sum of three waves, carrier wave, lower side band, upper side band, so we can place three generators in series to obtain the same result. 

published 3 years ago

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