HARMONICS A characteristic of energy generated by a vibration is that there will be a number of frequencies appearing up the frequency spectrum at multiples of the fundamental frequency. These are called Harmonics. The fundamental frequency is also the first harmonic.
In North Carolina, a DWI is usually a misdemeanor crime. However, if you have three or more DWI's in the past 10 years, you commit the felony offense of habitual impaired driving (Habitual DWI). Conviction of a felony Habitual DWI results in at least 12 months incarceration and a permanent license revocation.
The law article below goes into more detail on felony duis. In Oregon, a DUI becomes a Class C felony upon the fourth offense. Up until then, it should remain a misdemeanor unless it involved other elements such as endangerment of a child. The law article below goes into more detail on felony duis.