Hello!
I need to simulate FM signal, that will carry such informations as music.
I read many articles about FM basics, but everywhere was described the
simplest FM modulation using only one single SINe harmonic with equation:
FM = A*Cos(2*pi*Fc*t + M*Sin(2*pi*Fm*t))
where: A - amplitude, Fc - carrier frequency, M - modulation index, Fm - message
frequency.
A = 1, Fc = 60, M = 5, Fm = 5.
I tried adding one more harmonic like this: FM = A*Cos(2*pi*Fc*t +
M*(Sin(2*pi*Fm*t)+Sin(2*pi*3*Fm*t)) with 3 times greater frequency - but it seems
to be incorrect way, because I can recover message with single Sine message, but
with two - I get corrupted signal.
When we listen music - we hear many frequencies in same time (60Hz bass tones,
middle frequencies and high frequency sounds up to 15KHz) I want to know how this
FM modulation differs when using many harmonics for a message signal. What I might
done incorrect?
Thanks in advance.