Nonlinear dynamics

https://www.youtube.com/watch?v=Y0u3o9_BRVQ

Anyway, it has been a little while (i think) since I updated this blog.

Stuff is moving along well. The listening test is due for a slight modification.

Next up I am going to apply the LUFS measurement algorithm in matlab, and use it to process the loudness of all audio files used, to ensure a solid LUFS level.

I will then standardise the listening conditions to a particular LUFS measure using a dumy head and the listening test rig, to ensure everything is the same. I can then increase the LUFS on the test rig to test different loudness effects on the effects of DISTORTION on perceived loudness.

I cannot directly link only THD to perceived loudness in musical signals, so I am just going mainly for a distortion characteristic now,

Also, I will evaluate crest factor and other bits with the data I accrue to get a more accurate picture of the systems involved.

Finally I will perform some cross-correlation analysis on audio that has been passed through nonlinear devices, to give a number to amounts of distortion, even if it isn't a traditional distortion metric. I am also modifying the listening test to get relative loudness measures between a clean and distortion version of a signal, so we can find what the level change is for perceptual level difference.

Good stuff.

It is just a shame that I have no listening test data yet.
I am also thinking about simplifying the listening test, to make it less prone to error.