posted 19 February 2008 13:04            

what exactly is the Frequency envelope? I understand what the amplitude envelope is, but I don't understand what the Freq envelope is - I thought the TrackNumber defined the frequency and that the amp envelope is the amplitude of that frequency ... but now i'm confused...

posted 19 February 2008 14:08            

I think we are being a little creative with the language and the descriptions. Strictly speaking an amplitude envelope is the shape we would get in a time domain if we joined all the positive peaks together and all the negative peaks together. It envelopes the wave form.

We needed something to describe what we would get if we took one frame in the frequency domain and joined all the peaks (levels) of all the tracks. Fundamental on the left and highest track number on the right. This also looks like an envelope so we tend to call it the amplitude envelope.

This is what you see if you look at one frame of the left output of a spectrum module. Just as evolution happens we need to describe what comes out of the right side of a spectrum module and we end up calling it the frequency envelope. In one of these frames we get a level that represents the frequency of the fundamental on the left and the frequency of the highest track on the right and of cause all the others in the middle. This looks nothing like an envelope more like a wiggly ramp but it seemed to make sense to call it a frequency envelope.

This is my understanding of it anyway
others may think differently