Talk:Ring modulation
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[edit] Etymology
The article says 'It is referred to as "ring" modulation because the analog circuit of diodes originally used to implement this effect took the shape of a ring.'
I've never heard that said before - surely the "ring" comes from the clangorous types of sounds which the effect can generate - in those days, it was one of the only ways to get bell-like sounds.--feline1 12:43, 9 November 2005 (UTC)
-- it is indeed a ring of diodes, they all go "Clockwise" or "Counter clockwise", as opposed to in a Bridge Rectifier, in which all diodes face "left" or "right". Loscha 21:17, 5 January 2006 (UTC)
[edit] Two frequencies?
Citation from the article
"Thus, in the basic case where two sine waves of frequencies f1 and f2 (f2>f1) are multiplied, two new sine waves are created, with one at f1+f2 and the other at f2-f1."
Is the "f1+f2" and the "f2-f1" thing what convolution is all about?
It's weird that two frequencies are created, although only one should be given as output.
Thanks, --Abdull 19:09, 15 Nov 2004 (UTC)
- Both frequencies are given as output, though often one of them falls below the audible range. And no, this isn't really a convolution. In convolution you may multiply the frequency spectrums of the signal, but in this case we multiply the signals directly. - Rainwarrior 17:59, 16 August 2006 (UTC)
[edit] Contradition?
This article contradicts itself. In the first paragraph it states that the signals are multiplied, in the second it says that the sum is produced. --82.18.177.65 01:09, 4 October 2005 (UTC)
- The multiplication of the two voltages occours, but the Harmonic Spectrums are sum and differenced. Loscha 21:17, 5 January 2006 (UTC)
- This is not a contradiction, due to a trigonometric identity that is something like: 2 * sinA * sinB = sin((A+B)/2) + sin((A-B)/2) - Rainwarrior 17:57, 16 August 2006 (UTC)
[edit] Wrong topic?
Shouldn't there be a separate article about the use of effects called 'ring modulation' in modern sound equipment? It seems to me that this article should be about diode ring modulators, not something that takes the name from them.
