Rob, you have that entirely correct, whenever you get a cross of
phase like that, there will be a point, particularly in a mono
signal, where they will cancel out slightly, since the phases all
combine into one. If the signal is complex, or the signals are
complex, both stereo, then it should be less aparrent.
Curtis Delzer
Neal:
I am not sure, but I believe you are trying to achieve an equal power cross fade. I'm glad you got it working. The fades really are symmetrical; I think its a phase issue that makes them dip in the middle. Sine waves don't dip when you cross fade; everything else including white noise does, making me think its cancelation at work. If anyone has more knowledge of this, please let me know.
As for the positive strokes, I'm feeling fine!
Rob Meredith
>>> neal.ewers@xxxxxxxxxxxxxx 05/22/06 11:31AM >>> Rob, I no longer need the other two kinds of fades in the cross fade module. I was thinking that they would keep the little decrease in volume in the middle of the crossfade from occurring, but that is no longer happening. Here is what I do, and it might help others who have the same problem.
As I said, when I do a cross fade, I do get a bit of volume decrease in the middle of the fade. This is especially noticeable when doing a short cross fade of about 2 seconds. By the way, I have the trouble with cross fade fading out a bit in sound forge, and while there is a way to fix this, you need sighted help to first get it set up.
So, I do a cross fade in SR. I used pink noise as an example so I knew I had the same thing on both sides of the cross fade. When the cross fade of 2 seconds is completed, I am still at the mid point of the cross fade. So, I use the go to time feature to move back one second and set a begin selection point. I then move forward two seconds, the entire length of the cross fade with the go to time command and set an end point. Now, I have selection points set at the beginning and the end of the cross fade. I then use dip/rise to increase the volume between the two points so that the end result of the cross fade is totally one same volume. It works like a charm. I have found that depending on the length of the cross fade the mid point db rise in the dip/rise feature may have to be adjusted to get a constant volume, but I can certainly play around until I get it right. It's like having a magic wand and waving it over the file. Nice. Very nice.
OK, do you have enough positive strokes yet?
Neal