Monday, 17 September 2007

aa - week 8 - amplitude modulation

well little luck with making anything useful la AM sounds ie "sounds that mimic natural or
human-made sounds".[1]

had a lot of fun with modulating the modulators though.
Spent a bit of time on a scaling constant distance style AM, had to find the cent to freq ratio, but never felt i really understood whether it was doing what i wanted it to.

Then when mucking about with self modulation, I decided that a divider on it would be great ie pitch shift.
So a short delve into the spectral bidules reminded me of what FFT actually does ie average out frequencies.
This left me wondering what other options there were - I didn't want to use a seperate oscillator because I wanted feedback !!
Alas I decided that it was so much easier using a seperate oscillator and putting a divider onto the freq output of the note extractor, and it was - now my next excitement will be how to effectively change the wave type's of multiple oscillators simultaneously.

Anyway, my bidule featured AM and RM, with a fixed frequency and a moving frequency, and a sort of self modulation - which with the divider worked very well as a scaled movable modulator as well.

bidule is at :


[1] Haines, Christian. Week 8 - Sound Generation - AM Synthesis.

Haines, Christian. Audio Arts week 08 lecture. University of Adelaide, 11 September 2007.

"Chapter 3 - Loose Modeling Techniques". Miranda, Eduardo. 1998, Computer Sound
Synthesis for the Electronic Musician, Focal Press.

Reid, Gordon 2000, Synth Secrets - Part 11: Amplitude Modulation, Sound on Sound.

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