And the hack only seems to work on plastic keypads — metal returns too much heat noise for the IR camera to reliably discern with keys were just pressed.
2
用这类电缆纪录反射波,干扰噪音比以前应用的各类电缆要小。
Such cables record reflections with less interference from noise than was usually possible with earlier types.
The results demonstrate the cross correlation filter not only can suppress random noise in GPR signal but also confirm exactly the onset of reflection wave.