If the listener were to move his head slightly, this would change the elements of the matrix H. This would result in a loss in crosstalk cancellation control at certain frequencies (which form a harmonic series). When a crosstalk filter boosts some frequencies, we say that they bring spectral coloration i.e. affect the sound colour of the recording.
Hi all,
For the ones interested, I have created a video with audio examples to better explain the concept of acoustic crosstalk in stereo reproduction:
With improved algorithms is it possible to drastically reduce the sensitivity to head position and the impact of tonal coloration. BACCH algorithm is one alternative (patented) and I came up with a different solution that is less sensitive to head position (to avoid head tracking for standard listening situation)
The audio examples are generated using using a simple binaural room simulation (image-source model) for the raw versions and by adding the crosstalk reduction filters for the processed versions.
I will be happy to provide support for the ones willing to test my algorithms.
Best,
Thierry
No bone conduction? No leakage? No neural cross-processing? Just asking.
On the one hand we have purveyors of loudspeaker DSP like Bacch who purport to remove crosstalk from the soundfield for loudspeaker listening claiming it makes for a better listening experience, and on the other hand we have purveyors like Smyth who purport to introduce cross talk into the headphone listening soundfield claiming that makes for a better listening experience.This is exactly what Bob Carver did with his Sonic Holagraphy back in the 1980's:
https://patents.google.com/patent/US4218585
The effect was pretty wild, but was very sensitive to any head movements. He has said that he incorporated this concept into his current speaker design.
Polk Audio did the same thing but with an extra set of speakers in each cabinet with their SDA series also back in the 1980's. I was surprised to see that they still have a line of speakers with the technology.
https://www.polkaudio.com/discover/sda-technology
On the one hand we have purveyors of loudspeaker DSP like Bacch who purport to remove crosstalk from the soundfield for loudspeaker listening claiming it makes for a better listening experience, and on the other hand we have purveyors like Smyth who purport to introduce cross talk into the headphone listening soundfield claiming that makes for a better listening experience.
Obviously both positions can't be correct. And if the answer is some crosstalk is gooood but too much is baaad, then what support do any of these purveyors have to prove they are providing the Goldilocks amount?
How would a speaker so treated look if it ran through Amir's battery of tests, particularly those on the Klippel which measure directivity and in room response?