Talk:Frequency modulation synthesis

message: The intro seems to end abruptly - can anyone fix this?
Cheers —The preceding unsigned comment was added by 82.31.178.2 (talk • contribs).
:Reverted to an earlier version. Thanks for pointing it out. Femto 15:42, 20 April 2007 (UTC)
thread_title:  Missing text 

message: Hi there,
I was wondering why Phase Modulation is not realy covered by this article?
It seems PM has some interesting features compared to FM.
PM is also what most synth people understand as FM (or yamaha style FM).  —Preceding unsigned comment added by 83.87.224.111 (talk) 14:54, 11 January 2008 (UTC)
replies: text: Indeed, there is not enough information about FM versus PM in this article. As I understand it, from experimenting with the Nord Modular and Reaktor, the difference is this: With FM, the frequency of the carrier is modulated by the modulator; when the modulator signal is positive/negative, the carrier is sped up/slowed down; when the modulator signal goes through zero, the carrier oscillates at its original frequency. The difficulty here is that the perceived (average) frequency of the carrier changes if the modulator signal is not precisely symmetrical (centered around zero); in a graph of the modulator signal, the area inside the positive part of the curve should equal the area inside the negative part of the curve. This is why it is difficult to get stable FM with analog oscillators. With PM, the phase of the carrier is shifted by the modulator; when the modulator signal rises/falls, the carrier is sped up/slowed down; when the modulator signal goes through a maximum or minimum peak or stays constant (at any value, not necessarily zero), the carrier oscillates at its original frequency. The advantage here is that the modulator signal need not be symmetrical for the carrier to have a stable frequency. Now if someone with a PHD in DSP could explain this in the article, with the proper scientific terms and a good reference, I think a lot of synthesis newbies would find this artile much more useful. 84.198.246.199 (talk) 02:56, 16 April 2010 (UTC)
thread_title:  Phase Modulation? 

message: "Clearly a modulating waveform containing many frequencies (e.g. "partials") will create many FM sidebands."
Is it clear?  Only if we are assuming some sort of linear relationship, which may or may not be the case without delving into the mathematics...  Segrub  —Preceding unsigned comment added by Segrub (talk • contribs) 13:55, 20 February 2008 (UTC)
thread_title: Many frequencies? 

message: This article is a mess. Looks like the only way to synthesize FM signal is to use something that is related to _sound_ generation patent. Wrong.  — Preceding unsigned comment added by 178.36.189.88 (talk) 20:45, 21 October 2012 (UTC)
thread_title: Mess

message: The History section has a spurious mention of QAM, which is of no possible interest or relevance to understanding FM for music synthesis. (Indeed, the mention of Phase Modulation up at the top is also unnecessary.)  Suggest to remove the phrase "as both are essentially a special case of QAM,"  because the mathematical relationship between FM and PM holds without having to introduce the extra concept of QAM. 
Rick Jelliffe (talk) 10:25, 24 October 2017 (UTC)
thread_title: Why mention QAM?

message: Please comment on Talk:Synthesizer#John Chowning and digital FM synthesis? Andy Dingley (talk) 20:18, 4 February 2018 (UTC)
thread_title:  [[John Chowning]] and '''''digital''''' [[FM synthesis]] in 1971? 

message: Hi
I upload sound samples in WAV format corresponding to the plots.
But I don't know how to link to them.
For the interested ones, I used Mathematica for this.
soun01 = Play[Sin[omc*t + beta*Sin[omm*t]] /. {omc -> 220*2*Pi, omm -> 440*2*Pi, beta -> 0.1}, {t, 0, 
    1}]; Export["s01.wav", soun01];  — Preceding unsigned comment added by Mark.Rossum (talk • contribs) 20:50, 6 July 2019 (UTC)
thread_title:  Sound samples