--_003_CAGSooMMJrEu2etHz34dGX7oRThxYZgmjCwXTCxt1qDrv0gHQmailgm_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable On Wed, Nov 16, 2011 at 8:05 AM, wrote: > For AM signals, think in terms of an old WW2 movie, with a multi-engine b= omber. The sound from the engine goes from a strong 'throb' to almost no so= und. This occurs because the engines are running at slightly different revs= , meaning they get in sync and out of sync at various times - the time betw= een the two happens to be the difference in revs/min. Yup, beat frequency. > Now think of the AM RF signal in the same way. In the frequency domain (a= s seen on a spectrum analyser) it is seen as a carrier frequency with two s= idebands (assuming a pure sinewave modulation). This is like the engine rev= olutions, with one engine at a 'master' speed, and one engine at a slightly= slower speed, and one engine at exactly the same speed difference faster t= han the 'master' (assuming a 3 engine aeroplane). You know it is three diff= erent engine speeds, hence three different frequencies. > Now think in terms of the time domain, which is the signal as seen on an = ordinary oscilloscope. This is the same as what you will hear as the engine= notes, the time from the strongest sound to the minimal sound in the throb= is the amplitude modulation of the signal, as seen on the oscilloscope. > You are using different instruments (rev counter and ears) to measure the= same sound in two different ways. Yes, but my brain seems to only be able to visualize and understand the oscilloscope, amplitude and time. EDIT Ok I think I understand it a bit more now, thanks to your analogy. Seems to have struck the right nerves in by brain somehow. I created a simple plot consisting of two waves representing an AM signal. The amplitude of the carrier, Sin(10x) is modulated with a message signal, Sin(x) + 2. 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