On Sun, Feb 05, 2006 at 09:32:41PM +0200, John Anderson wrote:
> On Sun, 2006-01-29 at 13:40 +0100, Wolfgang Woehl wrote:
>
> > I make 2 audio files with 400 and 500 hz sine tones and play
> > them along (out of ardour). There is clearly audible beat
> > frequency, a 100 hz hum and harmonics of that.
>
> You should also get 900Hz. They're the sum & difference frequencies.
> Apparently broadcast people called them sidebands?
They are called sidebands if one frequency (the 'carrier') is a radio
frequency (e.g. 648 kHz - BBC world), and the other represents the
information to be transmitted (e.g. audio frequencies).
> They're also the reason that barbershop quartets get "ringing" chords.
Could you explain what you mean by that ?
-- FAReceived on Mon Feb 6 00:15:05 2006
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