Connecting out of phase will cancel?

[Akrambash]

I"m living very close to expressway where it is very noisy with vehicles honking and other sorts of noise pollution,hence it is very rare I open the windows for some natural air.
If i connect a mic to my amp and place the mic outside the window and reverse the phase of the speakers by swapping the leads, will i be able to cancel the sound. Is this practically possible. i haven't tried this yet bcs there is no mic input to my amp and here is my second question, can i connect mic to aux or phono input.
Thanks in advance

[AndrewT]

headphones with noise cancellation do this sort of thing.
I doubt it will be easy to replicate that in a room with real speakers.

[Akrambash]

Thanks Andrew.
Can anyone help me if there is any way to connect a mic to my amp which has no mic input. The inputs on the rear panel are as follows:
Phono,tuner,aux,rec out,playback. Apart from this there is six pin connector which looks like usb socket but I suspect it is not(it's written Direct Connect on it)
The amp in question is Technics SU-4

[Speedskater]

Some auto manufactures experimented with this to make car interiors quieter.
But it's almost impossible to make work with anything bigger than headphones.

[wakibaki]

I believe it's possible to create a 'zone of quiet' around your ears with suitable pickups and signal processing, but this would be very local and would require you to keep your head on a headrest or wear something on your head.

The problem is complexity. The incoming sound comes from multiple sources and via multiple paths. Even if you sample it at numerous locations, building an accurate model of the pressures throughout the room over time is difficult, and you have to do it quickly enough that you can synthesize an exactly cancelling set of pressures from 1 or 2 or however many speakers you have available. We can't even recreate an original sound exactly, so producing a complex room-filling anti-sound is beyond us at present.

There are ways of simplifying the problem. Feeding back a single frequency out of phase will produce cancellations at that frequency in some locations. So an annoying whistle of many cycles duration can be cancelled by a version of itself, but to do this reliably in anything but a small volume of space is almost impossible.

w

[MaVo]

Selfmade noise cancellation should be pretty difficult, since most diy speakers are not linear phase and thus wont cancel the signal at all frequencies. I think this should only be good at low frequencies... but in the end i would think about passive noise removal if you want results and not an endless journey into dsp and speaker design.