It would not be more signal.
https://en.m.wikipedia.org/wiki/Wave_interference
The goal of noise canceling is to fully use destructive wave interference to create a 0 amplitude "signal", which is no signal at all.
Re:A Better Way to Cancel Noise
by tedunangst on Friday August 31, 2018 @10:16PM
(#17889767)
The point of antinoise is that the pattern is erased. The air is still.
Isn't anti-noise signal, in itself, a noise? Whether or not it perfectly matches the noise signal or lags behind. Wouldn't that be more patterns that the brain would try to make sense of.