The sound of modulated audio signal

1. What is modulated sound?
2. How are audio signals modulated?
3. What does amplitude modulation sound like?
4. What happens when a signal is modulated?

What is modulated sound?

Whenever a PARAMETER of a sound or audio SIGNAL called the CARRIER is varied systematically, the signal is said to be modulated. The signal whose WAVEFORM is being used to control the carrier is called the modulator or program signal.

How are audio signals modulated?

Audio modulation effects manipulate the input audio over time via the control of a carrier signal. The input audio is referred to as the modulator signal, which technically controls the carrier signal, which is generally produced via an oscillator generator or signal detector. This quick definition is broad at best.

What does amplitude modulation sound like?

At modulating frequencies around 6 Hz, an amplitude modulated signal resembles a tremolo effect. As the frequency approaches the audio rate (20 Hz), the resulting sound takes on a sort of roughness.

What happens when a signal is modulated?

This process of imposing an input signal onto a carrier wave is called modulation. In other words, modulation changes the shape of a carrier wave to somehow encode the speech or data information that we were interested in carrying. Modulation is like hiding a code inside the carrier wave.