RockerAlex
Inspired
I've noticed you can now apply "Min Phase" and "Auto Trim" to the conversion process ... did Cab Lab 2 have any of those options ticked by default and is there any benefit to adding these in the conversion process?
Cliff, could you please explain what does exactly Min Phase and Auto Trim to a raw IR ?
Thank you.
Minimum Phase Transform basically throws away any of the original phase information and instead derives it from the magnitude response. Basically it will make your IR have the minimal delay time possible
If you are mixing IRs, you should probably choose this option to avoid the "phaseyness" that can result from combining IRs with different times of arrival.
Auto Trim will delete any leading silence from the IR - not the same as MPT, as this doesn't guarantee that the resulting IR will be minimum phase.
This is where I'm confused. I thought this was what did Auto trim and that's why I don't understand the difference between the two.
Your IR will contain 95ms of actual information (well assuming it actually contains information beyond 25ms but that's besides the point. I don't know what CabLab does internally but I highly doubt there will be any "stretch".Imagine I have a 100 ms IR with 5ms of silence at the very beginning. If I choose Auto trim, these 5ms will be removed, OK but will my IR be 95 ms length or will it be lengthened to 100ms and how in this case (stretching it, adding 5ms of silence in the end...) ?
Auto-trim does not throw away any phase information. MPT does. In mathematical terms MPT is the Hilbert Transform of the log of the magnitude response (hence the "throws ways the phase response")