Amplitude multiplication

1. How do you multiply two frequencies?
2. What happens when you multiply two signals?
3. What happens when you multiply two Sinusoids?
4. Is modulation addition or multiplication?

How do you multiply two frequencies?

If you multiply two signals with different frequency, it produce a composite signal with the two frequencies, one of them is the sum of the two input frequencies and the other is the differences of the two frequencies. It is law of physics.

What happens when you multiply two signals?

Multiplication of signals is exploited in the field of analog communication when performing amplitude modulation (AM). In AM, the message signal is multiplied with the carrier signal so as to obtain a modulated signal.

What happens when you multiply two Sinusoids?

The product of two real sinusoids results in the sum of two real sinusoids (having different frequencies). Interestingly, the resulting spectral components (those in the sum) are not at the frequencies in the product. Rather, they are at their sum and the difference.

Is modulation addition or multiplication?

Modulation is the process of merging two signals to form a third signal with desirable characteristics of both. This always involves nonlinear processes such as multiplication; you can't just add the two signals together.