- Joined
- May 24, 2016
- Messages
- 650
- Likes
- 2,444
- Thread Starter
- #281
Yes, a frequency dependent window is being used, as is pyschoacoustic filtering. This is derived from your excellent presentation on, "Acoustic and Pyschoacoustic Issues in Room Correction." I encourage folks to download the presentation and take in the first 31 slides. This explains at low frequencies we want to correct for both the loudspeaker and room and at high frequencies the first arrive timbre. This is also explained in detail in my video starting here. I revisit when I start using DSP tools that has these capabilities here.But, one smoothed measurement isn't nearly as bad as it's made out to be, assuming it's done right, and properly windowed at different frequencies (no using ONE window, nope).
I also cover the CTA2034 here and show the JBL M2 spins. But in the case of DRC, that is not the end goal. The end goal is to have a smooth frequency response arriving at our ears at the listening position. Technically, the ideal minimum phase response arriving at our ears as I explain in detail.
To verify the end result, we can drop a mic at the listening position and take one or multiple verification measurements with REW's default window of 500ms so we are letting all of the reflections in, on purpose! That way we can see how well the "room eq" is working along with linearizing the loudspeakers direct sound above a certain frequency range. That starts here.
The reason why the video is close to 2 hrs long is that this is complicated. It takes time to wrap ones head around frequency dependent windowing, psychoacoustics, room acoustics, our ears non-linear frequency response versus SPL, minimum phase systems, non-minimum phase behaviour in both loudspeakers and room acoustics, echoic memory, FIR filtering, convolution, etc. I tried to put the video together by building on concepts from the ground up to the point of using the DSP tools, listening to the results, because in the end, it is all about how good it sounds, to the verification measurements.
So if there something that folks don't understand or take issue with, then reference that particular part in the video and I will try my best to answer.
Last edited: