Noise cancelling headphones rely on the distance between microphone and ear being a small fraction of the audio wavelength. At high frequencies, that will be impossible to achieve, and, even if you put in a compensating delay, the path to the ear is going to depend on the direction of the source.

--
David Woolley
Owner K2 06123.

On 09/12/2018 16:40, CUTTER DAVID wrote:
ncies.  If your hearing takes you higher, the noise-cancelling has finished by 
then.  This is probably not the ability of the sensing mic but the circuitry 
and/or room acoustics, echo, etc.  I'm a little out of date on the subject but 
that's probably the essence of it

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