AA1 - Semester 2 - Week 8

Amplitude and Frequency Modulation (AM and FM)

Plogue Bidule is a total disaster; because I still have not mastered it.
However, after ages of trying to create two patches of Am and FM, I finally figured out the very simple and logical procedure of it. In amplitude modulation, the amplitude input of the oscillator should be receiving a signal from another oscillator. In Frequency modulation the frequency input should be the receiver!
Despite the simple algorithm of FM and AM, simulating a natural or man-made sound was pretty hard.
For the AM, I simulated the time period in which an 8-cylinder car (Chevrolet came to my mind) starts its engine, accelerates and stops. I like what I came up with!
The MP3 can be downloaded from here:for FM, I simulated the sound of an ambulance alarm (or whatever it is called in English).
The MP3 can be downloaded from here:The interesting occurrence in FM was the slight change of the tine when the carrier and the modulator have frequencies very close to each other. To see the effect, get the Plogue file from here and have a listen to it.
Here is the list of the AM and FM Plogue files I have and also some more stuff.
AM for the above MP3 (Chevrolet) :(Click the Download button)FM for the above MP3 (ambulance): (Click the Download button).
As it is apparent in the picture, I have modulated the signal with ITSELF. Nice sound..Here is the picture of my Protools session for the whole thing:Amplitude Modulation on YouTube..

References:
- Christian Haines 'Audio Arts 1.2' Lecture presented at the Electronic Music Unit, University of Adelaide, South Australia, 10/09/2007
- Amplitude Modulation. WhatIs.com . (http://searchsmb.techtarget.com/sDefinition/0,,sid44_gci214073,00.html) [Accessed 15/09/07]
- Amplitude Modulation. The University of Berkeley, Los Angeles, California, The United States of America. (http://robotics.eecs.berkeley.edu/~sastry/ee20/modulation/node3.html) [Accessed 15/09/2007]