5 Feb
2006
5 Feb
'06
4:28 p.m.
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:
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).
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're also the reason that barbershop quartets
get "ringing" chords.
Could you explain what you mean by that ?
--
FA