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jaakkopasanen / Impulcifer

Measurement and processing of binaural impulse responses for personalized surround virtualization on headphones.
MIT License
211 stars 14 forks source link

Manual Equalization #14

Open jaakkopasanen opened 5 years ago

jaakkopasanen commented 5 years ago

Headphone compensation does not take into account the fact that even around ear open back headphones alter ear canal resonances by dampening some frequencies and shifting peaks and notches. In addition headphone compensation is not possible at all with in-ear monitors.

Implement manual equalization where user creates equal loudness contour by comparing 1/3 octave band noises against each other or single anchor band (such as ~630 Hz) and adjusting gain for each band. This is to be done once with speakers that are used for measurement and once with headphones and speaker virtualization without any modifications to the impulse responses. These two curves can then be used to calculate equalization curve which counters the headphone's effect on ear canal resonance. After the calibration virtualized speaker (without any modifications to impulse response) should sound exactly like the real speaker.

It's important to do the equal loudness contour with virtualized speaker where there have not been any modification to the impulse responses. Cropping out tail, using tracking filter and other things will affect the overall frequency response of the system after which the real speakers and virtualized speakers are not comparable anymore. Once the calibration has been done any modifications to impulse responses for room correction etc can be done.

jaakkopasanen commented 4 years ago

David Griesinger's Youtube video about his software doing the same: https://www.youtube.com/watch?v=1VaKZr208Dc

rpx91 commented 4 years ago

In playing around with trying to get Transform working with my Air Pods Pro I've come to realise that the issue is the measurements of IEM's. On a few the frequency response consistency is well controlled, these transform well. On others, it's a crap shoot.

Equal loudness contour would help with IEM's also.

pillepalle1234 commented 3 years ago

Hello, any news on this? I think this is a high impact issue, the frequency repsonse at the eardrum might deviate by 10db or more from the measurement with in ear microphones.

Or is there a way to do it, like using Griesingers Tool or the PEACE GUI For EQApo which implemented such a test aswell. https://www.audiosciencereview.com/forum/index.php?threads/calibration-tool-for-headphone-hearing-capability.17279/