Adding two sine waves results in a low buzz

1. What do you get when you multiply 2 sine waves of different frequencies together?
2. How does a sine wave produce sound?

What do you get when you multiply 2 sine waves of different frequencies together?

When you multiply two sine waves, you end up with the sum and difference frequencies. So if the input frequency is 600KHz and the local oscillator frequency is 1055kHz, you end up with 455kHz and 1655kHz.

How does a sine wave produce sound?

A sine wave is a simple periodic sound. Musical instruments or the voice produce complex periodic sounds. They have a spectrum consisting of a series of harmonics. Each harmonic is a sine wave that has a frequency that is an integer multiple of the fundamental frequency.