Oh well so the legendary Z2 cant actually perform NC with another NC headphones?
I'm not a pro in audio stuff, but seems I heard that Walkman ZX1 support NC, so there must be a standard for NC headphones afterall??
If we just cant use the Z2 NC headphone, maybe other NC headphones still work??
Well what I worry most is the audio jack again, software can be modified but not practical for hardware /_\
Well I'm pretty such a noob in these things, just thinking about the possibility
I hope a guy with professional audio knowledge can teach me a lesson
Well, noise cancelling itself isn't very complex. Any phone can theorically do it. The part that is complex is having the right hardware for it to work well. Let me give you an extreme example... Say you are using standard earbuds and using the phone's microphone, the phone is away from earbuds themselves, so the sound it picks which would be cancelled is not exactly the sound that has to be cancelled... So even doing everything in software (instead of a DSP), you just can't use that mic and expect good results... it is also why headphones manufacturer can get away with "self contained" package, they have the microphone next to your ear, on the outside, so they know what they have to cancel out and they push that into the signal that goes into the small speakers.
And for this reason, there isn't a standard... headphones manufacturer are perfectly happy with their solution which doesn't involve any modifications to the standard 3 poles jack (4 poles if you add in the "regular" microphone).
Sony have done things the other way around, the NC hardware/software is in the phone and the headphones/earbuds only provide connections to the microphones...
As Olokos demonstrated, we probably even have the hardware (jack) to do it, it's just not wired up ! heh...
Your best bet, if you want Noise cancelling is with self-contained units.
